./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/seq-3.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/seq-3.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 6c770a3141edeab927df0da4e8c2152e1fb2e87b0c43a352500a7e3d3cff4533 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:37:06,069 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:37:06,072 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:37:06,129 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:37:06,129 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:37:06,133 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:37:06,136 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:37:06,140 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:37:06,143 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:37:06,148 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:37:06,150 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:37:06,152 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:37:06,152 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:37:06,155 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:37:06,157 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:37:06,162 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:37:06,163 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:37:06,165 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:37:06,167 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:37:06,175 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:37:06,177 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:37:06,179 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:37:06,182 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:37:06,183 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:37:06,193 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:37:06,193 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:37:06,194 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:37:06,196 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:37:06,196 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:37:06,198 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:37:06,198 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:37:06,199 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:37:06,202 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:37:06,203 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:37:06,205 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:37:06,205 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:37:06,206 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:37:06,206 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:37:06,207 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:37:06,208 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:37:06,208 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:37:06,209 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:37:06,253 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:37:06,254 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:37:06,254 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:37:06,255 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:37:06,261 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:37:06,262 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:37:06,262 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:37:06,262 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:37:06,262 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:37:06,263 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:37:06,263 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:37:06,264 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:37:06,264 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:37:06,264 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:37:06,264 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:37:06,265 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:37:06,265 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:37:06,265 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:37:06,266 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:37:06,266 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:37:06,267 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:37:06,267 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:37:06,267 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:37:06,267 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:37:06,267 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:37:06,268 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:37:06,269 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:37:06,270 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:37:06,270 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:37:06,270 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:37:06,270 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:37:06,271 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:37:06,271 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:37:06,271 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:37:06,271 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:37:06,271 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:37:06,272 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:37:06,272 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:37:06,272 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:37:06,272 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:37:06,272 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:37:06,273 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6c770a3141edeab927df0da4e8c2152e1fb2e87b0c43a352500a7e3d3cff4533 [2021-11-20 23:37:06,598 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:37:06,634 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:37:06,637 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:37:06,638 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:37:06,639 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:37:06,641 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/loop-invgen/seq-3.i [2021-11-20 23:37:06,719 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/data/e519e5eea/1700ecfc2cc246e581aa608cd0099837/FLAG2fe39a085 [2021-11-20 23:37:07,206 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:37:07,207 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/sv-benchmarks/c/loop-invgen/seq-3.i [2021-11-20 23:37:07,219 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/data/e519e5eea/1700ecfc2cc246e581aa608cd0099837/FLAG2fe39a085 [2021-11-20 23:37:07,584 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/data/e519e5eea/1700ecfc2cc246e581aa608cd0099837 [2021-11-20 23:37:07,586 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:37:07,588 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:37:07,607 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:37:07,607 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:37:07,611 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:37:07,612 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:37:07" (1/1) ... [2021-11-20 23:37:07,614 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ce43a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:07, skipping insertion in model container [2021-11-20 23:37:07,614 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:37:07" (1/1) ... [2021-11-20 23:37:07,622 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:37:07,639 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:37:07,848 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/sv-benchmarks/c/loop-invgen/seq-3.i[893,906] [2021-11-20 23:37:07,862 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:37:07,872 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:37:07,888 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/sv-benchmarks/c/loop-invgen/seq-3.i[893,906] [2021-11-20 23:37:07,894 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:37:07,908 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:37:07,908 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:07 WrapperNode [2021-11-20 23:37:07,908 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:37:07,910 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:37:07,910 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:37:07,910 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:37:07,923 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:07" (1/1) ... [2021-11-20 23:37:07,934 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:07" (1/1) ... [2021-11-20 23:37:07,964 INFO L137 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 64 [2021-11-20 23:37:07,964 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:37:07,965 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:37:07,965 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:37:07,966 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:37:07,976 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:07" (1/1) ... [2021-11-20 23:37:07,976 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:07" (1/1) ... [2021-11-20 23:37:07,978 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:07" (1/1) ... [2021-11-20 23:37:07,978 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:07" (1/1) ... [2021-11-20 23:37:07,982 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:07" (1/1) ... [2021-11-20 23:37:07,987 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:07" (1/1) ... [2021-11-20 23:37:07,988 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:07" (1/1) ... [2021-11-20 23:37:07,990 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:37:07,991 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:37:07,991 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:37:07,991 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:37:07,993 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:07" (1/1) ... [2021-11-20 23:37:08,005 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:37:08,017 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:08,029 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:37:08,031 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:37:08,077 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:37:08,077 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:37:08,078 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:37:08,078 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:37:08,139 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:37:08,141 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:37:08,273 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:37:08,297 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:37:08,298 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-20 23:37:08,301 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:37:08 BoogieIcfgContainer [2021-11-20 23:37:08,301 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:37:08,303 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:37:08,303 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:37:08,307 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:37:08,308 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:37:07" (1/3) ... [2021-11-20 23:37:08,308 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30ae4ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:37:08, skipping insertion in model container [2021-11-20 23:37:08,309 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:37:07" (2/3) ... [2021-11-20 23:37:08,309 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30ae4ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:37:08, skipping insertion in model container [2021-11-20 23:37:08,309 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:37:08" (3/3) ... [2021-11-20 23:37:08,314 INFO L111 eAbstractionObserver]: Analyzing ICFG seq-3.i [2021-11-20 23:37:08,319 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:37:08,319 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:37:08,378 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:37:08,387 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-20 23:37:08,387 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:37:08,405 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.7) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:08,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-20 23:37:08,411 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:08,412 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:08,413 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:08,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:08,420 INFO L85 PathProgramCache]: Analyzing trace with hash 388343819, now seen corresponding path program 1 times [2021-11-20 23:37:08,433 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:08,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205549589] [2021-11-20 23:37:08,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:08,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:08,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:08,794 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:08,794 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:08,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205549589] [2021-11-20 23:37:08,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205549589] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:37:08,811 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:37:08,811 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:37:08,813 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654988086] [2021-11-20 23:37:08,814 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:37:08,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:37:08,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:08,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:37:08,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:37:08,880 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.7) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:09,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:09,020 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2021-11-20 23:37:09,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:37:09,023 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-20 23:37:09,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:09,032 INFO L225 Difference]: With dead ends: 32 [2021-11-20 23:37:09,032 INFO L226 Difference]: Without dead ends: 18 [2021-11-20 23:37:09,036 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:37:09,043 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 19 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:09,044 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 24 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:09,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-20 23:37:09,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 12. [2021-11-20 23:37:09,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 11 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:09,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 15 transitions. [2021-11-20 23:37:09,077 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 15 transitions. Word has length 8 [2021-11-20 23:37:09,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:09,078 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 15 transitions. [2021-11-20 23:37:09,078 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:09,078 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 15 transitions. [2021-11-20 23:37:09,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-20 23:37:09,079 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:09,079 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:09,080 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:37:09,080 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:09,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:09,081 INFO L85 PathProgramCache]: Analyzing trace with hash -877914225, now seen corresponding path program 1 times [2021-11-20 23:37:09,081 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:09,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773577857] [2021-11-20 23:37:09,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:09,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:09,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:09,139 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:09,139 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:09,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773577857] [2021-11-20 23:37:09,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1773577857] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:37:09,140 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:37:09,140 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:37:09,140 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169719232] [2021-11-20 23:37:09,141 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:37:09,142 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:37:09,142 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:09,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:37:09,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:37:09,143 INFO L87 Difference]: Start difference. First operand 12 states and 15 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:09,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:09,198 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2021-11-20 23:37:09,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-20 23:37:09,199 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-20 23:37:09,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:09,200 INFO L225 Difference]: With dead ends: 22 [2021-11-20 23:37:09,200 INFO L226 Difference]: Without dead ends: 20 [2021-11-20 23:37:09,200 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:37:09,202 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 9 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:09,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 15 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:37:09,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-20 23:37:09,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 14. [2021-11-20 23:37:09,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:09,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2021-11-20 23:37:09,210 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 9 [2021-11-20 23:37:09,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:09,210 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2021-11-20 23:37:09,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:09,211 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2021-11-20 23:37:09,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-20 23:37:09,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:09,212 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:09,212 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 23:37:09,213 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:09,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:09,214 INFO L85 PathProgramCache]: Analyzing trace with hash -1881968511, now seen corresponding path program 1 times [2021-11-20 23:37:09,214 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:09,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847350180] [2021-11-20 23:37:09,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:09,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:09,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:09,337 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:09,338 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:09,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847350180] [2021-11-20 23:37:09,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1847350180] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:09,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [782537107] [2021-11-20 23:37:09,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:09,339 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:09,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:09,347 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:09,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:37:09,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:09,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 23:37:09,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:09,667 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:09,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:09,775 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:09,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [782537107] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:09,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1663487986] [2021-11-20 23:37:09,796 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:09,796 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:09,801 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:09,807 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:09,807 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:11,328 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:11,752 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:11,753 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:11,753 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2021-11-20 23:37:11,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113869755] [2021-11-20 23:37:11,753 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:11,754 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-20 23:37:11,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:11,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-20 23:37:11,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2021-11-20 23:37:11,756 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:11,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:11,901 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2021-11-20 23:37:11,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-20 23:37:11,903 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-20 23:37:11,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:11,904 INFO L225 Difference]: With dead ends: 32 [2021-11-20 23:37:11,904 INFO L226 Difference]: Without dead ends: 23 [2021-11-20 23:37:11,905 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=119, Invalid=531, Unknown=0, NotChecked=0, Total=650 [2021-11-20 23:37:11,908 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 17 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:11,909 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 59 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:11,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-20 23:37:11,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2021-11-20 23:37:11,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:11,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2021-11-20 23:37:11,917 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 12 [2021-11-20 23:37:11,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:11,917 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2021-11-20 23:37:11,917 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:11,918 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2021-11-20 23:37:11,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-20 23:37:11,918 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:11,918 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:11,950 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:12,119 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-20 23:37:12,119 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:12,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:12,120 INFO L85 PathProgramCache]: Analyzing trace with hash 1334724370, now seen corresponding path program 1 times [2021-11-20 23:37:12,120 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:12,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1103952970] [2021-11-20 23:37:12,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:12,120 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:12,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:12,219 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:12,219 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:12,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1103952970] [2021-11-20 23:37:12,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1103952970] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:12,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1046669172] [2021-11-20 23:37:12,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:12,224 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:12,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:12,234 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:12,245 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:37:12,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:12,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 23:37:12,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:12,441 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:12,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:12,507 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:12,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1046669172] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:12,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1174839796] [2021-11-20 23:37:12,510 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:12,526 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:12,526 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:12,526 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:12,527 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:13,582 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:13,947 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:13,948 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:13,948 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-20 23:37:13,948 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997874161] [2021-11-20 23:37:13,948 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:13,949 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-20 23:37:13,949 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:13,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-20 23:37:13,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2021-11-20 23:37:13,950 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:14,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:14,066 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2021-11-20 23:37:14,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-20 23:37:14,067 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-20 23:37:14,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:14,068 INFO L225 Difference]: With dead ends: 42 [2021-11-20 23:37:14,068 INFO L226 Difference]: Without dead ends: 33 [2021-11-20 23:37:14,069 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=101, Invalid=499, Unknown=0, NotChecked=0, Total=600 [2021-11-20 23:37:14,070 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 24 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:14,071 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 40 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:14,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-20 23:37:14,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2021-11-20 23:37:14,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:14,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2021-11-20 23:37:14,076 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 12 [2021-11-20 23:37:14,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:14,077 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2021-11-20 23:37:14,077 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:14,077 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2021-11-20 23:37:14,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-20 23:37:14,078 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:14,078 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:14,116 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:14,293 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:14,293 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:14,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:14,294 INFO L85 PathProgramCache]: Analyzing trace with hash -1261535739, now seen corresponding path program 2 times [2021-11-20 23:37:14,294 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:14,294 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83645952] [2021-11-20 23:37:14,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:14,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:14,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:14,340 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:14,340 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:14,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83645952] [2021-11-20 23:37:14,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [83645952] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:14,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [559232990] [2021-11-20 23:37:14,341 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:37:14,341 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:14,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:14,342 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:14,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:37:14,393 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 23:37:14,393 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:14,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-20 23:37:14,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:14,469 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:14,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:14,523 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:14,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [559232990] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:14,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1040808804] [2021-11-20 23:37:14,526 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:14,526 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:14,526 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:14,526 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:14,527 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:15,723 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:16,076 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:16,077 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:16,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 6 [2021-11-20 23:37:16,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647404186] [2021-11-20 23:37:16,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:16,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 23:37:16,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:16,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 23:37:16,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-11-20 23:37:16,079 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:16,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:16,177 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2021-11-20 23:37:16,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-20 23:37:16,178 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-20 23:37:16,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:16,179 INFO L225 Difference]: With dead ends: 27 [2021-11-20 23:37:16,179 INFO L226 Difference]: Without dead ends: 25 [2021-11-20 23:37:16,179 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=79, Invalid=263, Unknown=0, NotChecked=0, Total=342 [2021-11-20 23:37:16,181 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 16 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:16,181 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 22 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:16,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-20 23:37:16,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 19. [2021-11-20 23:37:16,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:16,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2021-11-20 23:37:16,186 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 13 [2021-11-20 23:37:16,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:16,187 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2021-11-20 23:37:16,187 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:16,187 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2021-11-20 23:37:16,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-20 23:37:16,190 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:16,190 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:16,223 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:16,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:16,391 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:16,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:16,392 INFO L85 PathProgramCache]: Analyzing trace with hash -1442517429, now seen corresponding path program 3 times [2021-11-20 23:37:16,392 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:16,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15146766] [2021-11-20 23:37:16,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:16,392 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:16,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:16,481 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:16,481 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:16,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15146766] [2021-11-20 23:37:16,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [15146766] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:16,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [366284737] [2021-11-20 23:37:16,482 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:37:16,482 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:16,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:16,483 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:16,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:37:16,521 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:37:16,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:16,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-20 23:37:16,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:16,709 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:16,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:16,793 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:16,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [366284737] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:16,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1466169296] [2021-11-20 23:37:16,799 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:16,799 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:16,799 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:16,799 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:16,800 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:18,095 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:18,442 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:18,443 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:18,443 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2021-11-20 23:37:18,443 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648519324] [2021-11-20 23:37:18,443 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:18,444 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-20 23:37:18,444 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:18,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-20 23:37:18,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=544, Unknown=0, NotChecked=0, Total=650 [2021-11-20 23:37:18,445 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:18,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:18,584 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2021-11-20 23:37:18,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 23:37:18,584 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-20 23:37:18,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:18,585 INFO L225 Difference]: With dead ends: 44 [2021-11-20 23:37:18,585 INFO L226 Difference]: Without dead ends: 32 [2021-11-20 23:37:18,586 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=169, Invalid=823, Unknown=0, NotChecked=0, Total=992 [2021-11-20 23:37:18,587 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 21 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:18,587 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 61 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:18,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-20 23:37:18,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 20. [2021-11-20 23:37:18,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:18,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-11-20 23:37:18,593 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 16 [2021-11-20 23:37:18,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:18,593 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-11-20 23:37:18,593 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:18,594 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-11-20 23:37:18,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-20 23:37:18,594 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:18,594 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:18,617 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:18,810 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:18,810 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:18,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:18,810 INFO L85 PathProgramCache]: Analyzing trace with hash -866118564, now seen corresponding path program 1 times [2021-11-20 23:37:18,811 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:18,811 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923853774] [2021-11-20 23:37:18,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:18,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:18,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:18,879 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:18,879 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:18,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923853774] [2021-11-20 23:37:18,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1923853774] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:18,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1133124271] [2021-11-20 23:37:18,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:18,879 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:18,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:18,880 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:18,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:37:18,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:18,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-20 23:37:18,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:19,066 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:19,067 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:19,124 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:19,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1133124271] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:19,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [273729541] [2021-11-20 23:37:19,127 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:19,127 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:19,127 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:19,127 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:19,128 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:20,293 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:20,562 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:20,562 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:20,562 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 16 [2021-11-20 23:37:20,563 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441815273] [2021-11-20 23:37:20,563 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:20,563 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-20 23:37:20,564 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:20,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-20 23:37:20,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=513, Unknown=0, NotChecked=0, Total=600 [2021-11-20 23:37:20,565 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:20,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:20,761 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-11-20 23:37:20,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-20 23:37:20,761 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-20 23:37:20,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:20,762 INFO L225 Difference]: With dead ends: 56 [2021-11-20 23:37:20,762 INFO L226 Difference]: Without dead ends: 44 [2021-11-20 23:37:20,763 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=154, Invalid=838, Unknown=0, NotChecked=0, Total=992 [2021-11-20 23:37:20,764 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 39 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:20,764 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 76 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:20,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-20 23:37:20,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 20. [2021-11-20 23:37:20,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:20,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-11-20 23:37:20,778 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 16 [2021-11-20 23:37:20,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:20,779 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-11-20 23:37:20,779 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:20,779 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-11-20 23:37:20,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-20 23:37:20,780 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:20,780 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:20,818 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:21,006 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-20 23:37:21,006 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:21,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:21,007 INFO L85 PathProgramCache]: Analyzing trace with hash -1678809045, now seen corresponding path program 2 times [2021-11-20 23:37:21,007 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:21,007 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [548934558] [2021-11-20 23:37:21,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:21,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:21,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:21,072 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:21,072 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:21,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [548934558] [2021-11-20 23:37:21,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [548934558] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:21,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [586694368] [2021-11-20 23:37:21,073 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:37:21,073 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:21,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:21,074 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:21,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:37:21,126 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:37:21,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:21,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-20 23:37:21,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:21,257 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:21,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:21,326 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:21,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [586694368] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:21,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1999928391] [2021-11-20 23:37:21,330 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:21,330 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:21,330 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:21,330 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:21,331 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:22,238 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:22,561 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:22,561 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:22,561 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2021-11-20 23:37:22,562 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072313019] [2021-11-20 23:37:22,562 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:22,562 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-20 23:37:22,562 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:22,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-20 23:37:22,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2021-11-20 23:37:22,563 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:22,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:22,703 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2021-11-20 23:37:22,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-20 23:37:22,704 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-20 23:37:22,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:22,705 INFO L225 Difference]: With dead ends: 69 [2021-11-20 23:37:22,705 INFO L226 Difference]: Without dead ends: 57 [2021-11-20 23:37:22,706 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=143, Invalid=727, Unknown=0, NotChecked=0, Total=870 [2021-11-20 23:37:22,706 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 47 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:22,707 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 41 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:37:22,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-20 23:37:22,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 21. [2021-11-20 23:37:22,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.3) internal successors, (26), 20 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:22,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2021-11-20 23:37:22,713 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 16 [2021-11-20 23:37:22,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:22,713 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2021-11-20 23:37:22,714 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:22,714 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2021-11-20 23:37:22,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-20 23:37:22,714 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:22,715 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:22,752 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:22,936 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:22,936 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:22,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:22,936 INFO L85 PathProgramCache]: Analyzing trace with hash -1745511985, now seen corresponding path program 4 times [2021-11-20 23:37:22,937 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:22,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1064698987] [2021-11-20 23:37:22,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:22,937 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:22,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:22,992 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:22,992 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:22,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1064698987] [2021-11-20 23:37:22,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1064698987] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:22,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1994879755] [2021-11-20 23:37:22,993 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:37:22,993 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:22,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:22,994 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:23,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:37:23,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:23,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-20 23:37:23,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:23,076 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:23,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:23,132 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:23,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1994879755] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:23,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1704497019] [2021-11-20 23:37:23,135 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:23,135 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:23,135 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:23,136 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:23,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:24,147 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:24,427 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:24,427 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:24,428 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 7 [2021-11-20 23:37:24,428 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430384412] [2021-11-20 23:37:24,428 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:24,428 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 23:37:24,429 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:24,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 23:37:24,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-11-20 23:37:24,429 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:24,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:24,521 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2021-11-20 23:37:24,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 23:37:24,521 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-20 23:37:24,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:24,522 INFO L225 Difference]: With dead ends: 32 [2021-11-20 23:37:24,522 INFO L226 Difference]: Without dead ends: 30 [2021-11-20 23:37:24,523 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=96, Invalid=324, Unknown=0, NotChecked=0, Total=420 [2021-11-20 23:37:24,523 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 16 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:24,524 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 18 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:24,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-20 23:37:24,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2021-11-20 23:37:24,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 23 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:24,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2021-11-20 23:37:24,529 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 17 [2021-11-20 23:37:24,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:24,530 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2021-11-20 23:37:24,530 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:24,530 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2021-11-20 23:37:24,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-20 23:37:24,531 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:24,531 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:24,569 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:24,746 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-20 23:37:24,746 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:24,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:24,747 INFO L85 PathProgramCache]: Analyzing trace with hash -1373649343, now seen corresponding path program 5 times [2021-11-20 23:37:24,747 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:24,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636937127] [2021-11-20 23:37:24,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:24,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:24,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:24,851 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:24,851 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:24,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636937127] [2021-11-20 23:37:24,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [636937127] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:24,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1600610221] [2021-11-20 23:37:24,852 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:37:24,852 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:24,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:24,853 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:24,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:37:24,893 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-20 23:37:24,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:24,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-20 23:37:24,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:25,110 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:25,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:25,190 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:25,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1600610221] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:25,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2063721026] [2021-11-20 23:37:25,193 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:25,193 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:25,194 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:25,194 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:25,194 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:26,145 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:26,459 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:26,459 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:26,459 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 21 [2021-11-20 23:37:26,459 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178637767] [2021-11-20 23:37:26,460 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:26,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-20 23:37:26,460 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:26,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-20 23:37:26,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=734, Unknown=0, NotChecked=0, Total=870 [2021-11-20 23:37:26,461 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:26,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:26,636 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-11-20 23:37:26,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-20 23:37:26,636 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-20 23:37:26,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:26,637 INFO L225 Difference]: With dead ends: 56 [2021-11-20 23:37:26,637 INFO L226 Difference]: Without dead ends: 41 [2021-11-20 23:37:26,638 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=231, Invalid=1175, Unknown=0, NotChecked=0, Total=1406 [2021-11-20 23:37:26,639 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 27 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:26,639 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 89 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:26,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-20 23:37:26,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 25. [2021-11-20 23:37:26,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.25) internal successors, (30), 24 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:26,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2021-11-20 23:37:26,651 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 20 [2021-11-20 23:37:26,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:26,651 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2021-11-20 23:37:26,652 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:26,652 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2021-11-20 23:37:26,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-20 23:37:26,652 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:26,653 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:26,675 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:26,862 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-20 23:37:26,862 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:26,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:26,862 INFO L85 PathProgramCache]: Analyzing trace with hash 1130855378, now seen corresponding path program 2 times [2021-11-20 23:37:26,863 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:26,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026611071] [2021-11-20 23:37:26,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:26,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:26,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:26,974 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:26,974 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:26,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026611071] [2021-11-20 23:37:26,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2026611071] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:26,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [734167712] [2021-11-20 23:37:26,975 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:37:26,975 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:26,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:26,990 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:26,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 23:37:27,027 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-20 23:37:27,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:27,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-20 23:37:27,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:27,221 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:27,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:27,297 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:27,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [734167712] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:27,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [560092821] [2021-11-20 23:37:27,299 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:27,299 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:27,299 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:27,300 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:27,300 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:28,333 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:28,582 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:28,582 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:28,582 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 20 [2021-11-20 23:37:28,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739654854] [2021-11-20 23:37:28,582 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:28,583 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-20 23:37:28,583 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:28,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-20 23:37:28,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=698, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:37:28,584 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:28,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:28,777 INFO L93 Difference]: Finished difference Result 72 states and 80 transitions. [2021-11-20 23:37:28,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-20 23:37:28,777 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-20 23:37:28,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:28,778 INFO L225 Difference]: With dead ends: 72 [2021-11-20 23:37:28,778 INFO L226 Difference]: Without dead ends: 57 [2021-11-20 23:37:28,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=224, Invalid=1258, Unknown=0, NotChecked=0, Total=1482 [2021-11-20 23:37:28,780 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 39 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:28,780 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 87 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:28,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-20 23:37:28,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 25. [2021-11-20 23:37:28,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.25) internal successors, (30), 24 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:28,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2021-11-20 23:37:28,787 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 20 [2021-11-20 23:37:28,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:28,787 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2021-11-20 23:37:28,787 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:28,787 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2021-11-20 23:37:28,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-20 23:37:28,788 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:28,788 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:28,825 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-20 23:37:29,006 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:29,006 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:29,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:29,007 INFO L85 PathProgramCache]: Analyzing trace with hash 1350193185, now seen corresponding path program 3 times [2021-11-20 23:37:29,007 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:29,007 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549493596] [2021-11-20 23:37:29,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:29,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:29,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:29,087 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:29,087 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:29,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549493596] [2021-11-20 23:37:29,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549493596] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:29,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [523034623] [2021-11-20 23:37:29,088 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:37:29,088 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:29,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:29,102 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:29,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 23:37:29,132 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:37:29,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:29,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-20 23:37:29,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:29,351 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:29,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:29,414 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:29,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [523034623] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:29,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2039828445] [2021-11-20 23:37:29,416 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:29,416 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:29,416 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:29,416 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:29,417 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:30,366 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:30,625 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:30,625 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:30,625 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2021-11-20 23:37:30,625 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090497574] [2021-11-20 23:37:30,625 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:30,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-20 23:37:30,626 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:30,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-20 23:37:30,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=648, Unknown=0, NotChecked=0, Total=756 [2021-11-20 23:37:30,626 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:30,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:30,799 INFO L93 Difference]: Finished difference Result 87 states and 96 transitions. [2021-11-20 23:37:30,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-20 23:37:30,799 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-20 23:37:30,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:30,800 INFO L225 Difference]: With dead ends: 87 [2021-11-20 23:37:30,800 INFO L226 Difference]: Without dead ends: 72 [2021-11-20 23:37:30,801 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 386 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=215, Invalid=1191, Unknown=0, NotChecked=0, Total=1406 [2021-11-20 23:37:30,802 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 39 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:30,802 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 85 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:30,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-20 23:37:30,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 25. [2021-11-20 23:37:30,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.25) internal successors, (30), 24 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:30,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2021-11-20 23:37:30,809 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 20 [2021-11-20 23:37:30,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:30,809 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2021-11-20 23:37:30,809 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:30,809 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2021-11-20 23:37:30,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-20 23:37:30,810 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:30,810 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:30,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:31,023 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:31,024 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:31,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:31,024 INFO L85 PathProgramCache]: Analyzing trace with hash 1218721266, now seen corresponding path program 3 times [2021-11-20 23:37:31,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:31,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713109385] [2021-11-20 23:37:31,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:31,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:31,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:31,119 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:31,120 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:31,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713109385] [2021-11-20 23:37:31,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [713109385] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:31,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [821153844] [2021-11-20 23:37:31,121 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:37:31,121 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:31,121 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:31,122 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:31,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 23:37:31,162 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:37:31,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:31,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-20 23:37:31,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:31,327 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:31,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:31,392 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:31,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [821153844] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:31,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1485880701] [2021-11-20 23:37:31,393 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:31,394 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:31,394 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:31,394 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:31,394 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:32,301 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:32,586 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:32,586 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:32,586 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2021-11-20 23:37:32,586 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113176644] [2021-11-20 23:37:32,586 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:32,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-20 23:37:32,587 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:32,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-20 23:37:32,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=597, Unknown=0, NotChecked=0, Total=702 [2021-11-20 23:37:32,587 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:32,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:32,748 INFO L93 Difference]: Finished difference Result 103 states and 114 transitions. [2021-11-20 23:37:32,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-20 23:37:32,749 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-20 23:37:32,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:32,749 INFO L225 Difference]: With dead ends: 103 [2021-11-20 23:37:32,749 INFO L226 Difference]: Without dead ends: 88 [2021-11-20 23:37:32,750 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 301 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=194, Invalid=996, Unknown=0, NotChecked=0, Total=1190 [2021-11-20 23:37:32,751 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 73 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:32,751 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 61 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:32,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-20 23:37:32,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 26. [2021-11-20 23:37:32,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.28) internal successors, (32), 25 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:32,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2021-11-20 23:37:32,758 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 20 [2021-11-20 23:37:32,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:32,759 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2021-11-20 23:37:32,759 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:32,759 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2021-11-20 23:37:32,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-20 23:37:32,760 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:32,760 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:32,791 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:32,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-20 23:37:32,974 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:32,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:32,974 INFO L85 PathProgramCache]: Analyzing trace with hash -1794699323, now seen corresponding path program 6 times [2021-11-20 23:37:32,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:32,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1478110558] [2021-11-20 23:37:32,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:32,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:32,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:33,025 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:33,026 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:33,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1478110558] [2021-11-20 23:37:33,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1478110558] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:33,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1798849928] [2021-11-20 23:37:33,026 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:37:33,026 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:33,027 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:33,027 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:33,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-20 23:37:33,071 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:37:33,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:33,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-20 23:37:33,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:33,119 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:33,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:33,166 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:33,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1798849928] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:33,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [330773957] [2021-11-20 23:37:33,168 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:33,168 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:33,169 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:33,169 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:33,169 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:34,170 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:34,437 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:34,438 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:34,438 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 8 [2021-11-20 23:37:34,438 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961224810] [2021-11-20 23:37:34,438 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:34,438 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-20 23:37:34,438 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:34,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-20 23:37:34,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2021-11-20 23:37:34,439 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:34,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:34,535 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2021-11-20 23:37:34,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-20 23:37:34,535 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-20 23:37:34,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:34,536 INFO L225 Difference]: With dead ends: 37 [2021-11-20 23:37:34,536 INFO L226 Difference]: Without dead ends: 35 [2021-11-20 23:37:34,537 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=116, Invalid=390, Unknown=0, NotChecked=0, Total=506 [2021-11-20 23:37:34,537 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 23 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:34,538 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 22 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:37:34,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-20 23:37:34,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 29. [2021-11-20 23:37:34,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.25) internal successors, (35), 28 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:34,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2021-11-20 23:37:34,544 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 21 [2021-11-20 23:37:34,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:34,545 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2021-11-20 23:37:34,545 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:34,545 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2021-11-20 23:37:34,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-20 23:37:34,559 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:34,559 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:34,580 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:34,759 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-20 23:37:34,760 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:34,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:34,761 INFO L85 PathProgramCache]: Analyzing trace with hash -2129787765, now seen corresponding path program 7 times [2021-11-20 23:37:34,761 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:34,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236518274] [2021-11-20 23:37:34,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:34,761 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:34,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:34,872 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:34,873 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:34,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236518274] [2021-11-20 23:37:34,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1236518274] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:34,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [43382153] [2021-11-20 23:37:34,873 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:37:34,873 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:34,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:34,874 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:34,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-20 23:37:34,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:34,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-20 23:37:34,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:35,178 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:35,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:35,265 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:35,265 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [43382153] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:35,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1041708039] [2021-11-20 23:37:35,267 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:35,267 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:35,267 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:35,268 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:35,268 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:36,172 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:36,511 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:36,512 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:36,512 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 25 [2021-11-20 23:37:36,513 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740038410] [2021-11-20 23:37:36,513 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:36,513 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-20 23:37:36,513 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:36,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-20 23:37:36,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=950, Unknown=0, NotChecked=0, Total=1122 [2021-11-20 23:37:36,514 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:36,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:36,712 INFO L93 Difference]: Finished difference Result 68 states and 76 transitions. [2021-11-20 23:37:36,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 23:37:36,713 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-20 23:37:36,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:36,713 INFO L225 Difference]: With dead ends: 68 [2021-11-20 23:37:36,713 INFO L226 Difference]: Without dead ends: 50 [2021-11-20 23:37:36,714 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=305, Invalid=1587, Unknown=0, NotChecked=0, Total=1892 [2021-11-20 23:37:36,715 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 27 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:36,716 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 96 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:36,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-20 23:37:36,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 30. [2021-11-20 23:37:36,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:36,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-11-20 23:37:36,733 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 24 [2021-11-20 23:37:36,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:36,733 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-11-20 23:37:36,733 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:36,733 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-11-20 23:37:36,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-20 23:37:36,734 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:36,734 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:36,754 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:36,946 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:36,947 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:36,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:36,947 INFO L85 PathProgramCache]: Analyzing trace with hash 426674588, now seen corresponding path program 4 times [2021-11-20 23:37:36,947 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:36,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [612020849] [2021-11-20 23:37:36,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:36,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:36,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:37,054 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 16 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:37,054 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:37,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [612020849] [2021-11-20 23:37:37,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [612020849] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:37,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1921838992] [2021-11-20 23:37:37,055 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:37:37,055 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:37,055 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:37,056 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:37,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-20 23:37:37,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:37,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-20 23:37:37,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:37,293 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:37,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:37,367 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:37,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1921838992] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:37,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [296843468] [2021-11-20 23:37:37,368 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:37,368 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:37,369 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:37,369 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:37,369 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:38,217 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:38,477 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:38,477 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:38,478 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2021-11-20 23:37:38,478 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711263323] [2021-11-20 23:37:38,478 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:38,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-20 23:37:38,478 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:38,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-20 23:37:38,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=909, Unknown=0, NotChecked=0, Total=1056 [2021-11-20 23:37:38,479 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 25 states, 25 states have (on average 2.08) internal successors, (52), 24 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:38,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:38,729 INFO L93 Difference]: Finished difference Result 88 states and 97 transitions. [2021-11-20 23:37:38,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-20 23:37:38,730 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.08) internal successors, (52), 24 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-20 23:37:38,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:38,731 INFO L225 Difference]: With dead ends: 88 [2021-11-20 23:37:38,731 INFO L226 Difference]: Without dead ends: 70 [2021-11-20 23:37:38,732 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 635 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=310, Invalid=1760, Unknown=0, NotChecked=0, Total=2070 [2021-11-20 23:37:38,732 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 39 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:38,733 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 86 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:38,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-20 23:37:38,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 30. [2021-11-20 23:37:38,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:38,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-11-20 23:37:38,740 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 24 [2021-11-20 23:37:38,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:38,748 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-11-20 23:37:38,748 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.08) internal successors, (52), 24 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:38,749 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-11-20 23:37:38,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-20 23:37:38,749 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:38,750 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:38,779 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:38,970 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-20 23:37:38,970 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:38,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:38,971 INFO L85 PathProgramCache]: Analyzing trace with hash -45048213, now seen corresponding path program 5 times [2021-11-20 23:37:38,971 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:38,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1371251997] [2021-11-20 23:37:38,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:38,972 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:38,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:39,063 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 16 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:39,063 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:39,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1371251997] [2021-11-20 23:37:39,063 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1371251997] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:39,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1024039148] [2021-11-20 23:37:39,064 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:37:39,064 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:39,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:39,065 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:39,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-20 23:37:39,111 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-20 23:37:39,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:39,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-20 23:37:39,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:39,351 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 26 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:39,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:39,439 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 26 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:39,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1024039148] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:39,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [864851724] [2021-11-20 23:37:39,443 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:39,444 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:39,444 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:39,444 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:39,444 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:40,325 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:40,600 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:40,600 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:40,600 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2021-11-20 23:37:40,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015461903] [2021-11-20 23:37:40,601 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:40,601 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-20 23:37:40,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:40,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-20 23:37:40,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=854, Unknown=0, NotChecked=0, Total=992 [2021-11-20 23:37:40,603 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 24 states, 24 states have (on average 2.125) internal successors, (51), 23 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:40,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:40,843 INFO L93 Difference]: Finished difference Result 107 states and 117 transitions. [2021-11-20 23:37:40,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-20 23:37:40,843 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.125) internal successors, (51), 23 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-20 23:37:40,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:40,844 INFO L225 Difference]: With dead ends: 107 [2021-11-20 23:37:40,844 INFO L226 Difference]: Without dead ends: 89 [2021-11-20 23:37:40,845 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 620 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=310, Invalid=1760, Unknown=0, NotChecked=0, Total=2070 [2021-11-20 23:37:40,846 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 39 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:40,846 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 96 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:40,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-20 23:37:40,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 30. [2021-11-20 23:37:40,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:40,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-11-20 23:37:40,870 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 24 [2021-11-20 23:37:40,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:40,870 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-11-20 23:37:40,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.125) internal successors, (51), 23 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:40,871 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-11-20 23:37:40,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-20 23:37:40,871 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:40,871 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:40,895 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:41,086 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-20 23:37:41,086 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:41,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:41,086 INFO L85 PathProgramCache]: Analyzing trace with hash 1602302908, now seen corresponding path program 6 times [2021-11-20 23:37:41,087 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:41,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936045885] [2021-11-20 23:37:41,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:41,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:41,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:41,220 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 16 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:41,220 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:41,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936045885] [2021-11-20 23:37:41,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [936045885] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:41,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2009315175] [2021-11-20 23:37:41,221 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:37:41,221 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:41,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:41,222 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:41,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-20 23:37:41,268 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:37:41,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:41,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-20 23:37:41,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:41,507 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:41,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:41,590 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:41,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2009315175] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:41,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [997591759] [2021-11-20 23:37:41,593 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:41,593 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:41,593 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:41,594 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:41,594 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:42,739 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:43,000 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:43,000 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:43,000 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2021-11-20 23:37:43,000 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233284923] [2021-11-20 23:37:43,000 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:43,001 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-20 23:37:43,001 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:43,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-20 23:37:43,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=797, Unknown=0, NotChecked=0, Total=930 [2021-11-20 23:37:43,002 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:43,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:43,262 INFO L93 Difference]: Finished difference Result 125 states and 136 transitions. [2021-11-20 23:37:43,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-20 23:37:43,262 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-20 23:37:43,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:43,265 INFO L225 Difference]: With dead ends: 125 [2021-11-20 23:37:43,266 INFO L226 Difference]: Without dead ends: 107 [2021-11-20 23:37:43,267 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 534 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=288, Invalid=1604, Unknown=0, NotChecked=0, Total=1892 [2021-11-20 23:37:43,267 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 71 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:43,269 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 94 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:43,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-20 23:37:43,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 30. [2021-11-20 23:37:43,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:43,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-11-20 23:37:43,286 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 24 [2021-11-20 23:37:43,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:43,286 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-11-20 23:37:43,287 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:43,287 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-11-20 23:37:43,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-20 23:37:43,292 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:43,292 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:43,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:43,510 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-20 23:37:43,510 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:43,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:43,511 INFO L85 PathProgramCache]: Analyzing trace with hash 1932537931, now seen corresponding path program 4 times [2021-11-20 23:37:43,511 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:43,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918432878] [2021-11-20 23:37:43,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:43,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:43,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:43,628 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:43,628 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:43,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918432878] [2021-11-20 23:37:43,628 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1918432878] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:43,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [165156990] [2021-11-20 23:37:43,629 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:37:43,629 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:43,629 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:43,630 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:43,645 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-20 23:37:43,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:43,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-20 23:37:43,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:43,858 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:43,858 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:43,921 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:43,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [165156990] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:43,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1589307678] [2021-11-20 23:37:43,923 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:43,923 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:43,923 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:43,923 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:43,923 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:44,703 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:44,987 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:44,988 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:44,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 21 [2021-11-20 23:37:44,988 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641144374] [2021-11-20 23:37:44,988 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:44,988 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-20 23:37:44,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:44,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-20 23:37:44,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=739, Unknown=0, NotChecked=0, Total=870 [2021-11-20 23:37:44,989 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:45,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:45,173 INFO L93 Difference]: Finished difference Result 144 states and 157 transitions. [2021-11-20 23:37:45,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-20 23:37:45,173 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-20 23:37:45,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:45,174 INFO L225 Difference]: With dead ends: 144 [2021-11-20 23:37:45,174 INFO L226 Difference]: Without dead ends: 126 [2021-11-20 23:37:45,175 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=254, Invalid=1306, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 23:37:45,176 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 86 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:45,176 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 76 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:45,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-20 23:37:45,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 31. [2021-11-20 23:37:45,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 30 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:45,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2021-11-20 23:37:45,184 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 24 [2021-11-20 23:37:45,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:45,185 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2021-11-20 23:37:45,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:45,185 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2021-11-20 23:37:45,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-20 23:37:45,186 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:45,186 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:45,209 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-11-20 23:37:45,394 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:45,394 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:45,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:45,395 INFO L85 PathProgramCache]: Analyzing trace with hash -1469256689, now seen corresponding path program 8 times [2021-11-20 23:37:45,395 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:45,395 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934796488] [2021-11-20 23:37:45,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:45,395 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:45,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:45,480 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:45,480 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:45,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934796488] [2021-11-20 23:37:45,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [934796488] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:45,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [260534716] [2021-11-20 23:37:45,481 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:37:45,481 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:45,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:45,482 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:45,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-20 23:37:45,530 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-20 23:37:45,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:45,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-20 23:37:45,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:45,588 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:45,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:45,649 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:45,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [260534716] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:45,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1330656509] [2021-11-20 23:37:45,652 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:45,653 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:45,653 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:45,653 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:45,653 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:46,512 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:46,768 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:46,768 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:46,769 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 9 [2021-11-20 23:37:46,769 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688866428] [2021-11-20 23:37:46,769 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:46,769 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-20 23:37:46,769 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:46,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-20 23:37:46,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2021-11-20 23:37:46,770 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:46,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:46,895 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2021-11-20 23:37:46,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-20 23:37:46,896 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-20 23:37:46,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:46,896 INFO L225 Difference]: With dead ends: 42 [2021-11-20 23:37:46,896 INFO L226 Difference]: Without dead ends: 40 [2021-11-20 23:37:46,896 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 67 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=139, Invalid=461, Unknown=0, NotChecked=0, Total=600 [2021-11-20 23:37:46,897 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 22 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:46,897 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 22 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:46,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-20 23:37:46,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 34. [2021-11-20 23:37:46,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 33 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:46,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2021-11-20 23:37:46,903 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 25 [2021-11-20 23:37:46,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:46,904 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2021-11-20 23:37:46,904 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:46,904 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2021-11-20 23:37:46,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-20 23:37:46,905 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:46,905 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:46,926 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:47,109 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:47,109 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:47,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:47,110 INFO L85 PathProgramCache]: Analyzing trace with hash -609465343, now seen corresponding path program 9 times [2021-11-20 23:37:47,110 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:47,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453152587] [2021-11-20 23:37:47,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:47,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:47,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:47,235 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:47,235 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:47,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453152587] [2021-11-20 23:37:47,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [453152587] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:47,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1932812146] [2021-11-20 23:37:47,236 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:37:47,236 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:47,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:47,237 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:47,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-20 23:37:47,274 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:37:47,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:47,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-20 23:37:47,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:47,633 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:47,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:47,732 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:47,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1932812146] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:47,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [738688742] [2021-11-20 23:37:47,734 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:47,734 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:47,735 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:47,735 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:47,735 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:48,633 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:48,970 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:48,970 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:48,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 29 [2021-11-20 23:37:48,970 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228831263] [2021-11-20 23:37:48,970 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:48,971 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-20 23:37:48,971 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:48,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-20 23:37:48,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=1192, Unknown=0, NotChecked=0, Total=1406 [2021-11-20 23:37:48,972 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:49,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:49,208 INFO L93 Difference]: Finished difference Result 80 states and 89 transitions. [2021-11-20 23:37:49,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-20 23:37:49,208 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-20 23:37:49,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:49,208 INFO L225 Difference]: With dead ends: 80 [2021-11-20 23:37:49,208 INFO L226 Difference]: Without dead ends: 59 [2021-11-20 23:37:49,210 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 787 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=391, Invalid=2059, Unknown=0, NotChecked=0, Total=2450 [2021-11-20 23:37:49,210 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 16 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:49,210 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 113 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 172 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:49,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-20 23:37:49,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 35. [2021-11-20 23:37:49,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:49,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2021-11-20 23:37:49,218 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 28 [2021-11-20 23:37:49,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:49,218 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2021-11-20 23:37:49,218 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:49,218 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2021-11-20 23:37:49,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-20 23:37:49,219 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:49,219 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:49,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:49,422 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:49,422 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:49,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:49,422 INFO L85 PathProgramCache]: Analyzing trace with hash -1758338926, now seen corresponding path program 7 times [2021-11-20 23:37:49,422 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:49,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1423799758] [2021-11-20 23:37:49,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:49,423 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:49,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:49,529 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:49,530 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:49,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1423799758] [2021-11-20 23:37:49,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1423799758] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:49,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [723510550] [2021-11-20 23:37:49,530 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:37:49,531 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:49,531 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:49,537 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:49,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-20 23:37:49,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:49,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-20 23:37:49,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:49,904 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 40 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:49,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:49,994 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 40 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:49,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [723510550] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:49,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1659074986] [2021-11-20 23:37:49,996 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:49,996 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:49,996 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:49,996 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:49,996 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:50,869 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:51,156 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:51,157 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:51,157 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 28 [2021-11-20 23:37:51,157 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628582533] [2021-11-20 23:37:51,157 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:51,158 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-20 23:37:51,158 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:51,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-20 23:37:51,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1146, Unknown=0, NotChecked=0, Total=1332 [2021-11-20 23:37:51,159 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 29 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 28 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:51,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:51,517 INFO L93 Difference]: Finished difference Result 104 states and 114 transitions. [2021-11-20 23:37:51,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-20 23:37:51,517 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 28 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-20 23:37:51,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:51,518 INFO L225 Difference]: With dead ends: 104 [2021-11-20 23:37:51,518 INFO L226 Difference]: Without dead ends: 83 [2021-11-20 23:37:51,519 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 876 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=412, Invalid=2344, Unknown=0, NotChecked=0, Total=2756 [2021-11-20 23:37:51,520 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 34 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:51,520 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 133 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:51,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-20 23:37:51,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 35. [2021-11-20 23:37:51,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:51,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2021-11-20 23:37:51,528 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 28 [2021-11-20 23:37:51,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:51,528 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2021-11-20 23:37:51,528 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 28 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:51,528 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2021-11-20 23:37:51,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-20 23:37:51,529 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:51,529 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:51,550 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:51,734 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:51,734 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:51,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:51,738 INFO L85 PathProgramCache]: Analyzing trace with hash -548473375, now seen corresponding path program 8 times [2021-11-20 23:37:51,738 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:51,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589432127] [2021-11-20 23:37:51,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:51,739 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:51,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:51,850 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 27 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:51,851 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:51,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589432127] [2021-11-20 23:37:51,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [589432127] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:51,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2138798935] [2021-11-20 23:37:51,851 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:37:51,851 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:51,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:51,852 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:51,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-20 23:37:51,887 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-20 23:37:51,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:51,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-20 23:37:51,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:52,152 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 40 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:52,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:52,228 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 40 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:52,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2138798935] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:52,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1780542336] [2021-11-20 23:37:52,229 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:52,229 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:52,230 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:52,230 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:52,230 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:53,130 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:53,401 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:53,401 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:53,401 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2021-11-20 23:37:53,403 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405035970] [2021-11-20 23:37:53,404 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:53,404 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-20 23:37:53,404 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:53,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-20 23:37:53,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1086, Unknown=0, NotChecked=0, Total=1260 [2021-11-20 23:37:53,405 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 28 states, 28 states have (on average 2.107142857142857) internal successors, (59), 27 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:53,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:53,714 INFO L93 Difference]: Finished difference Result 127 states and 138 transitions. [2021-11-20 23:37:53,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-20 23:37:53,714 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.107142857142857) internal successors, (59), 27 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-20 23:37:53,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:53,715 INFO L225 Difference]: With dead ends: 127 [2021-11-20 23:37:53,715 INFO L226 Difference]: Without dead ends: 106 [2021-11-20 23:37:53,716 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 895 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=426, Invalid=2436, Unknown=0, NotChecked=0, Total=2862 [2021-11-20 23:37:53,717 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 44 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:53,717 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 128 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:53,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-11-20 23:37:53,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 35. [2021-11-20 23:37:53,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:53,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2021-11-20 23:37:53,723 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 28 [2021-11-20 23:37:53,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:53,723 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2021-11-20 23:37:53,724 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.107142857142857) internal successors, (59), 27 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:53,724 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2021-11-20 23:37:53,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-20 23:37:53,724 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:53,724 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:53,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:53,926 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:53,926 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:53,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:53,926 INFO L85 PathProgramCache]: Analyzing trace with hash -509445454, now seen corresponding path program 9 times [2021-11-20 23:37:53,926 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:53,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [124495480] [2021-11-20 23:37:53,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:53,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:53,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:54,045 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 27 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:54,045 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:54,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [124495480] [2021-11-20 23:37:54,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [124495480] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:54,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [535583966] [2021-11-20 23:37:54,046 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:37:54,046 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:54,046 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:54,050 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:54,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-20 23:37:54,082 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:37:54,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:54,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-20 23:37:54,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:54,316 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 40 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:54,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:54,388 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 40 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:54,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [535583966] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:54,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1056231818] [2021-11-20 23:37:54,389 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:54,390 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:54,390 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:54,390 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:54,390 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:55,270 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:55,547 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:55,548 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:55,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2021-11-20 23:37:55,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527941249] [2021-11-20 23:37:55,548 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:55,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-20 23:37:55,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:55,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-20 23:37:55,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=1024, Unknown=0, NotChecked=0, Total=1190 [2021-11-20 23:37:55,549 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:55,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:55,891 INFO L93 Difference]: Finished difference Result 149 states and 161 transitions. [2021-11-20 23:37:55,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-20 23:37:55,891 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-20 23:37:55,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:55,892 INFO L225 Difference]: With dead ends: 149 [2021-11-20 23:37:55,892 INFO L226 Difference]: Without dead ends: 128 [2021-11-20 23:37:55,893 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 839 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=412, Invalid=2344, Unknown=0, NotChecked=0, Total=2756 [2021-11-20 23:37:55,894 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 60 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:55,895 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 125 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:55,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-20 23:37:55,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 35. [2021-11-20 23:37:55,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:55,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2021-11-20 23:37:55,902 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 28 [2021-11-20 23:37:55,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:55,902 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2021-11-20 23:37:55,902 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:55,902 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2021-11-20 23:37:55,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-20 23:37:55,902 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:55,902 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:55,922 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2021-11-20 23:37:56,103 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-20 23:37:56,103 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:56,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:56,103 INFO L85 PathProgramCache]: Analyzing trace with hash 1431476161, now seen corresponding path program 10 times [2021-11-20 23:37:56,103 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:56,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1737560428] [2021-11-20 23:37:56,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:56,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:56,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:56,217 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:56,217 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:56,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1737560428] [2021-11-20 23:37:56,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1737560428] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:56,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529469296] [2021-11-20 23:37:56,218 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:37:56,218 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:56,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:56,219 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:56,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-20 23:37:56,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:56,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-20 23:37:56,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:56,525 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 40 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:56,525 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:56,621 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 40 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:56,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529469296] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:56,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2097545878] [2021-11-20 23:37:56,622 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:56,622 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:56,623 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:56,623 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:56,623 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:57,557 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:57,824 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:57,824 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:57,824 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 25 [2021-11-20 23:37:57,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843368611] [2021-11-20 23:37:57,824 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:57,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-20 23:37:57,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:57,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-20 23:37:57,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=960, Unknown=0, NotChecked=0, Total=1122 [2021-11-20 23:37:57,826 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:58,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:58,136 INFO L93 Difference]: Finished difference Result 170 states and 183 transitions. [2021-11-20 23:37:58,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-20 23:37:58,136 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-20 23:37:58,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:58,137 INFO L225 Difference]: With dead ends: 170 [2021-11-20 23:37:58,137 INFO L226 Difference]: Without dead ends: 149 [2021-11-20 23:37:58,139 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 705 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=373, Invalid=2077, Unknown=0, NotChecked=0, Total=2450 [2021-11-20 23:37:58,139 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 81 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:58,139 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 100 Invalid, 183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:58,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-20 23:37:58,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 35. [2021-11-20 23:37:58,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:58,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2021-11-20 23:37:58,152 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 28 [2021-11-20 23:37:58,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:58,152 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2021-11-20 23:37:58,152 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:58,152 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2021-11-20 23:37:58,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-20 23:37:58,153 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:58,153 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:58,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:58,374 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-20 23:37:58,374 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:58,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:58,374 INFO L85 PathProgramCache]: Analyzing trace with hash -307028782, now seen corresponding path program 5 times [2021-11-20 23:37:58,374 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:58,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917933586] [2021-11-20 23:37:58,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:58,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:58,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:58,496 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:58,496 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:58,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [917933586] [2021-11-20 23:37:58,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [917933586] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:58,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066549457] [2021-11-20 23:37:58,496 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:37:58,496 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:58,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:58,497 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:58,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-20 23:37:58,529 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-20 23:37:58,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:58,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-20 23:37:58,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:58,737 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:58,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:58,808 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:58,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2066549457] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:58,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [397214015] [2021-11-20 23:37:58,810 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:37:58,810 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:58,810 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:58,810 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:58,810 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:59,577 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:59,874 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:59,874 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:59,874 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 24 [2021-11-20 23:37:59,874 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973041437] [2021-11-20 23:37:59,874 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:59,874 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-20 23:37:59,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:59,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-20 23:37:59,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=895, Unknown=0, NotChecked=0, Total=1056 [2021-11-20 23:37:59,875 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:00,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:00,157 INFO L93 Difference]: Finished difference Result 192 states and 207 transitions. [2021-11-20 23:38:00,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-20 23:38:00,158 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-20 23:38:00,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:00,159 INFO L225 Difference]: With dead ends: 192 [2021-11-20 23:38:00,159 INFO L226 Difference]: Without dead ends: 171 [2021-11-20 23:38:00,160 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 533 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=323, Invalid=1657, Unknown=0, NotChecked=0, Total=1980 [2021-11-20 23:38:00,160 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 141 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:00,160 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [141 Valid, 100 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:00,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-11-20 23:38:00,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 36. [2021-11-20 23:38:00,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 35 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:00,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2021-11-20 23:38:00,172 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 28 [2021-11-20 23:38:00,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:00,172 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2021-11-20 23:38:00,172 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:00,173 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2021-11-20 23:38:00,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-20 23:38:00,173 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:00,173 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:00,218 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:00,393 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:00,393 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:00,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:00,393 INFO L85 PathProgramCache]: Analyzing trace with hash -494677627, now seen corresponding path program 10 times [2021-11-20 23:38:00,393 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:00,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [741578988] [2021-11-20 23:38:00,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:00,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:00,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:00,467 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:00,467 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:00,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [741578988] [2021-11-20 23:38:00,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [741578988] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:00,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [407160524] [2021-11-20 23:38:00,467 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:38:00,468 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:00,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:00,474 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:00,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-20 23:38:00,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:00,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-20 23:38:00,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:00,593 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:00,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:00,654 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:00,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [407160524] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:00,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2014617057] [2021-11-20 23:38:00,656 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:00,656 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:00,657 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:00,657 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:00,657 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:01,505 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:01,765 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:01,766 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:01,766 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 10 [2021-11-20 23:38:01,766 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805066876] [2021-11-20 23:38:01,766 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:01,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-20 23:38:01,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:01,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-20 23:38:01,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2021-11-20 23:38:01,769 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:01,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:01,927 INFO L93 Difference]: Finished difference Result 47 states and 55 transitions. [2021-11-20 23:38:01,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-20 23:38:01,927 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-20 23:38:01,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:01,928 INFO L225 Difference]: With dead ends: 47 [2021-11-20 23:38:01,928 INFO L226 Difference]: Without dead ends: 45 [2021-11-20 23:38:01,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=165, Invalid=537, Unknown=0, NotChecked=0, Total=702 [2021-11-20 23:38:01,929 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 25 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:01,929 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 22 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:01,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-20 23:38:01,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 39. [2021-11-20 23:38:01,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.236842105263158) internal successors, (47), 38 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:01,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2021-11-20 23:38:01,943 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 29 [2021-11-20 23:38:01,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:01,943 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2021-11-20 23:38:01,943 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:01,943 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2021-11-20 23:38:01,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-20 23:38:01,944 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:01,944 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:01,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:02,170 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-20 23:38:02,170 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:02,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:02,170 INFO L85 PathProgramCache]: Analyzing trace with hash -903550261, now seen corresponding path program 11 times [2021-11-20 23:38:02,171 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:02,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1481747475] [2021-11-20 23:38:02,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:02,171 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:02,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:02,314 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 41 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:02,314 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:02,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1481747475] [2021-11-20 23:38:02,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1481747475] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:02,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1746080558] [2021-11-20 23:38:02,316 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:38:02,316 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:02,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:02,317 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:02,318 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-20 23:38:02,357 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-20 23:38:02,358 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:02,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-20 23:38:02,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:02,699 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:02,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:02,781 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:02,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1746080558] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:02,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1105760476] [2021-11-20 23:38:02,783 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:02,783 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:02,783 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:02,783 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:02,783 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:03,641 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:03,982 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:03,983 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:03,983 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 33 [2021-11-20 23:38:03,983 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273098327] [2021-11-20 23:38:03,983 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:03,983 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-20 23:38:03,983 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:03,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-20 23:38:03,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=1460, Unknown=0, NotChecked=0, Total=1722 [2021-11-20 23:38:03,984 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:04,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:04,270 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2021-11-20 23:38:04,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-20 23:38:04,270 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-20 23:38:04,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:04,271 INFO L225 Difference]: With dead ends: 92 [2021-11-20 23:38:04,271 INFO L226 Difference]: Without dead ends: 68 [2021-11-20 23:38:04,272 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1013 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=489, Invalid=2591, Unknown=0, NotChecked=0, Total=3080 [2021-11-20 23:38:04,272 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 16 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:04,273 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 124 Invalid, 210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 197 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:04,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-20 23:38:04,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 40. [2021-11-20 23:38:04,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:04,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-11-20 23:38:04,283 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2021-11-20 23:38:04,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:04,284 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-11-20 23:38:04,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:04,284 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-11-20 23:38:04,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-20 23:38:04,284 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:04,285 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:04,310 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:04,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-20 23:38:04,494 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:04,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:04,494 INFO L85 PathProgramCache]: Analyzing trace with hash 1757138652, now seen corresponding path program 11 times [2021-11-20 23:38:04,494 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:04,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1410153113] [2021-11-20 23:38:04,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:04,495 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:04,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:04,641 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 41 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:04,641 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:04,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1410153113] [2021-11-20 23:38:04,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1410153113] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:04,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1442630947] [2021-11-20 23:38:04,641 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:38:04,641 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:04,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:04,646 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:04,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-20 23:38:04,695 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-20 23:38:04,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:04,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-20 23:38:04,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:05,023 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 57 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:05,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:05,119 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 57 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:05,119 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1442630947] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:05,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2104737175] [2021-11-20 23:38:05,120 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:05,121 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:05,121 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:05,121 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:05,121 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:05,968 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:06,259 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:06,259 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:06,259 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 32 [2021-11-20 23:38:06,259 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065616111] [2021-11-20 23:38:06,260 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:06,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-20 23:38:06,260 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:06,260 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-20 23:38:06,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=1409, Unknown=0, NotChecked=0, Total=1640 [2021-11-20 23:38:06,261 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 33 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 32 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:06,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:06,583 INFO L93 Difference]: Finished difference Result 120 states and 131 transitions. [2021-11-20 23:38:06,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-20 23:38:06,584 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 32 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-20 23:38:06,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:06,584 INFO L225 Difference]: With dead ends: 120 [2021-11-20 23:38:06,584 INFO L226 Difference]: Without dead ends: 96 [2021-11-20 23:38:06,586 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1154 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=530, Invalid=3010, Unknown=0, NotChecked=0, Total=3540 [2021-11-20 23:38:06,587 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 39 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:06,587 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 80 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:06,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-20 23:38:06,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 40. [2021-11-20 23:38:06,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:06,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-11-20 23:38:06,604 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2021-11-20 23:38:06,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:06,604 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-11-20 23:38:06,604 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 32 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:06,604 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-11-20 23:38:06,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-20 23:38:06,605 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:06,605 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:06,639 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:06,830 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-20 23:38:06,830 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:06,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:06,830 INFO L85 PathProgramCache]: Analyzing trace with hash -2036357973, now seen corresponding path program 12 times [2021-11-20 23:38:06,830 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:06,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837723467] [2021-11-20 23:38:06,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:06,831 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:06,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:06,993 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 41 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:06,993 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:06,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1837723467] [2021-11-20 23:38:06,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1837723467] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:06,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1266151258] [2021-11-20 23:38:06,993 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:38:06,993 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:06,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:06,998 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:07,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-20 23:38:07,032 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:38:07,032 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:07,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-20 23:38:07,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:07,335 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 57 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:07,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:07,417 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 57 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:07,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1266151258] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:07,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1068595418] [2021-11-20 23:38:07,419 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:07,419 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:07,419 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:07,419 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:07,419 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:08,267 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:08,550 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:08,551 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:08,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2021-11-20 23:38:08,551 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [393639751] [2021-11-20 23:38:08,551 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:08,551 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-20 23:38:08,551 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:08,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-20 23:38:08,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=1344, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 23:38:08,552 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 32 states, 32 states have (on average 2.09375) internal successors, (67), 31 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:09,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:09,031 INFO L93 Difference]: Finished difference Result 147 states and 159 transitions. [2021-11-20 23:38:09,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-20 23:38:09,032 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.09375) internal successors, (67), 31 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-20 23:38:09,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:09,033 INFO L225 Difference]: With dead ends: 147 [2021-11-20 23:38:09,033 INFO L226 Difference]: Without dead ends: 123 [2021-11-20 23:38:09,034 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1219 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=563, Invalid=3219, Unknown=0, NotChecked=0, Total=3782 [2021-11-20 23:38:09,035 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 57 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:09,035 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 116 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:09,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-20 23:38:09,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 40. [2021-11-20 23:38:09,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:09,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-11-20 23:38:09,056 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2021-11-20 23:38:09,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:09,057 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-11-20 23:38:09,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.09375) internal successors, (67), 31 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:09,057 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-11-20 23:38:09,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-20 23:38:09,058 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:09,058 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:09,098 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:09,274 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:09,274 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:09,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:09,274 INFO L85 PathProgramCache]: Analyzing trace with hash 1997691132, now seen corresponding path program 13 times [2021-11-20 23:38:09,275 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:09,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1363023571] [2021-11-20 23:38:09,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:09,275 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:09,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:09,445 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 41 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:09,446 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:09,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1363023571] [2021-11-20 23:38:09,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1363023571] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:09,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1223062846] [2021-11-20 23:38:09,446 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:38:09,446 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:09,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:09,447 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:09,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-20 23:38:09,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:09,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-20 23:38:09,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:09,833 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 57 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:09,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:09,915 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 57 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:09,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1223062846] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:09,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [851066430] [2021-11-20 23:38:09,916 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:09,917 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:09,917 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:09,917 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:09,917 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:10,824 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:11,120 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:11,120 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:11,120 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2021-11-20 23:38:11,120 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290550695] [2021-11-20 23:38:11,120 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:11,120 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-20 23:38:11,120 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:11,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-20 23:38:11,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=1277, Unknown=0, NotChecked=0, Total=1482 [2021-11-20 23:38:11,121 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:11,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:11,547 INFO L93 Difference]: Finished difference Result 173 states and 186 transitions. [2021-11-20 23:38:11,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-20 23:38:11,547 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-20 23:38:11,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:11,548 INFO L225 Difference]: With dead ends: 173 [2021-11-20 23:38:11,548 INFO L226 Difference]: Without dead ends: 149 [2021-11-20 23:38:11,549 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1197 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=563, Invalid=3219, Unknown=0, NotChecked=0, Total=3782 [2021-11-20 23:38:11,549 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 47 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:11,550 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 163 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:11,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-20 23:38:11,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 40. [2021-11-20 23:38:11,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:11,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-11-20 23:38:11,561 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2021-11-20 23:38:11,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:11,561 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-11-20 23:38:11,562 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:11,562 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-11-20 23:38:11,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-20 23:38:11,562 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:11,562 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:11,583 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2021-11-20 23:38:11,766 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:11,766 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:11,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:11,766 INFO L85 PathProgramCache]: Analyzing trace with hash 742348427, now seen corresponding path program 14 times [2021-11-20 23:38:11,766 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:11,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986267886] [2021-11-20 23:38:11,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:11,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:11,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:11,913 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 41 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:11,913 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:11,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986267886] [2021-11-20 23:38:11,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1986267886] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:11,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1409588082] [2021-11-20 23:38:11,914 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:38:11,914 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:11,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:11,915 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:11,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-20 23:38:11,967 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-20 23:38:11,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:11,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-20 23:38:11,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:12,325 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 57 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:12,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:12,435 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 57 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:12,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1409588082] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:12,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1584458338] [2021-11-20 23:38:12,436 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:12,437 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:12,437 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:12,437 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:12,437 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:13,426 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:13,713 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:13,713 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:13,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 29 [2021-11-20 23:38:13,714 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768613050] [2021-11-20 23:38:13,714 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:13,714 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-20 23:38:13,714 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:13,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-20 23:38:13,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=1208, Unknown=0, NotChecked=0, Total=1406 [2021-11-20 23:38:13,715 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:14,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:14,137 INFO L93 Difference]: Finished difference Result 198 states and 212 transitions. [2021-11-20 23:38:14,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-20 23:38:14,137 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-20 23:38:14,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:14,138 INFO L225 Difference]: With dead ends: 198 [2021-11-20 23:38:14,138 INFO L226 Difference]: Without dead ends: 174 [2021-11-20 23:38:14,139 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1092 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=530, Invalid=3010, Unknown=0, NotChecked=0, Total=3540 [2021-11-20 23:38:14,139 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 71 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:14,139 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 130 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 209 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:14,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-11-20 23:38:14,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 40. [2021-11-20 23:38:14,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:14,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-11-20 23:38:14,158 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2021-11-20 23:38:14,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:14,158 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-11-20 23:38:14,159 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:14,159 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-11-20 23:38:14,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-20 23:38:14,159 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:14,159 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:14,190 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:14,374 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:14,374 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:14,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:14,374 INFO L85 PathProgramCache]: Analyzing trace with hash -406525156, now seen corresponding path program 15 times [2021-11-20 23:38:14,374 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:14,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [222406033] [2021-11-20 23:38:14,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:14,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:14,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:14,536 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 41 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:14,536 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:14,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [222406033] [2021-11-20 23:38:14,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [222406033] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:14,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1608161876] [2021-11-20 23:38:14,536 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:38:14,537 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:14,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:14,539 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:14,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-20 23:38:14,581 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:38:14,581 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:14,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-20 23:38:14,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:14,868 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 57 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:14,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:14,949 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 57 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:14,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1608161876] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:14,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1484194202] [2021-11-20 23:38:14,950 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:14,950 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:14,950 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:14,950 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:14,950 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:15,796 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:16,075 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:16,075 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:16,075 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 28 [2021-11-20 23:38:16,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830177416] [2021-11-20 23:38:16,076 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:16,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-20 23:38:16,076 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:16,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-20 23:38:16,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=1137, Unknown=0, NotChecked=0, Total=1332 [2021-11-20 23:38:16,076 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 29 states, 29 states have (on average 2.206896551724138) internal successors, (64), 28 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:16,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:16,466 INFO L93 Difference]: Finished difference Result 222 states and 237 transitions. [2021-11-20 23:38:16,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-20 23:38:16,466 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.206896551724138) internal successors, (64), 28 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-20 23:38:16,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:16,468 INFO L225 Difference]: With dead ends: 222 [2021-11-20 23:38:16,468 INFO L226 Difference]: Without dead ends: 198 [2021-11-20 23:38:16,468 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 899 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=470, Invalid=2610, Unknown=0, NotChecked=0, Total=3080 [2021-11-20 23:38:16,469 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 79 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:16,469 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 139 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 196 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:16,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-11-20 23:38:16,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 40. [2021-11-20 23:38:16,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:16,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-11-20 23:38:16,488 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2021-11-20 23:38:16,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:16,489 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-11-20 23:38:16,489 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.206896551724138) internal successors, (64), 28 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:16,489 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-11-20 23:38:16,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-20 23:38:16,489 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:16,489 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:16,512 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2021-11-20 23:38:16,690 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:16,690 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:16,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:16,690 INFO L85 PathProgramCache]: Analyzing trace with hash 803340395, now seen corresponding path program 6 times [2021-11-20 23:38:16,691 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:16,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1709779930] [2021-11-20 23:38:16,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:16,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:16,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:16,851 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 41 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:16,852 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:16,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1709779930] [2021-11-20 23:38:16,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1709779930] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:16,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1993031328] [2021-11-20 23:38:16,852 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:38:16,852 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:16,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:16,866 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:16,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-20 23:38:16,912 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:38:16,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:16,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-20 23:38:16,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:17,281 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:17,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:17,391 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:17,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1993031328] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:17,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1625176133] [2021-11-20 23:38:17,392 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:17,392 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:17,393 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:17,393 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:17,393 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:18,272 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:18,604 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:18,604 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:18,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 27 [2021-11-20 23:38:18,605 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499686673] [2021-11-20 23:38:18,605 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:18,605 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-20 23:38:18,605 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:18,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-20 23:38:18,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=1065, Unknown=0, NotChecked=0, Total=1260 [2021-11-20 23:38:18,606 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 28 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:18,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:18,942 INFO L93 Difference]: Finished difference Result 247 states and 264 transitions. [2021-11-20 23:38:18,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-20 23:38:18,943 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-20 23:38:18,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:18,944 INFO L225 Difference]: With dead ends: 247 [2021-11-20 23:38:18,944 INFO L226 Difference]: Without dead ends: 223 [2021-11-20 23:38:18,945 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 670 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=401, Invalid=2049, Unknown=0, NotChecked=0, Total=2450 [2021-11-20 23:38:18,946 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 113 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:18,946 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 121 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:18,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2021-11-20 23:38:18,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 41. [2021-11-20 23:38:18,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.25) internal successors, (50), 40 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:18,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 50 transitions. [2021-11-20 23:38:18,965 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 50 transitions. Word has length 32 [2021-11-20 23:38:18,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:18,966 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 50 transitions. [2021-11-20 23:38:18,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:18,966 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 50 transitions. [2021-11-20 23:38:18,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-20 23:38:18,967 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:18,967 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:19,001 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2021-11-20 23:38:19,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:19,186 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:19,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:19,186 INFO L85 PathProgramCache]: Analyzing trace with hash -420082097, now seen corresponding path program 12 times [2021-11-20 23:38:19,186 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:19,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566121882] [2021-11-20 23:38:19,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:19,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:19,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:19,264 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:19,264 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:19,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566121882] [2021-11-20 23:38:19,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [566121882] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:19,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1703253849] [2021-11-20 23:38:19,265 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:38:19,265 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:19,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:19,266 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:19,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-20 23:38:19,320 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:38:19,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:19,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-20 23:38:19,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:19,387 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:19,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:19,473 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:19,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1703253849] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:19,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2092022302] [2021-11-20 23:38:19,474 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:19,475 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:19,475 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:19,475 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:19,475 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:20,429 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:20,726 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:20,726 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:20,726 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 11 [2021-11-20 23:38:20,726 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958604892] [2021-11-20 23:38:20,726 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:20,727 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-20 23:38:20,727 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:20,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-20 23:38:20,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2021-11-20 23:38:20,727 INFO L87 Difference]: Start difference. First operand 41 states and 50 transitions. Second operand has 12 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 11 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:20,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:20,950 INFO L93 Difference]: Finished difference Result 52 states and 61 transitions. [2021-11-20 23:38:20,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-20 23:38:20,950 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 11 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-20 23:38:20,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:20,951 INFO L225 Difference]: With dead ends: 52 [2021-11-20 23:38:20,951 INFO L226 Difference]: Without dead ends: 50 [2021-11-20 23:38:20,951 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 197 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=194, Invalid=618, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:38:20,952 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 44 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:20,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 19 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:20,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-20 23:38:20,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 44. [2021-11-20 23:38:20,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.2325581395348837) internal successors, (53), 43 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:20,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2021-11-20 23:38:20,977 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 33 [2021-11-20 23:38:20,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:20,978 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2021-11-20 23:38:20,978 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 11 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:20,978 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2021-11-20 23:38:20,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-20 23:38:20,979 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:20,979 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:21,018 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:21,194 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-20 23:38:21,194 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:21,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:21,194 INFO L85 PathProgramCache]: Analyzing trace with hash 873791937, now seen corresponding path program 13 times [2021-11-20 23:38:21,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:21,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945470378] [2021-11-20 23:38:21,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:21,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:21,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:21,378 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 58 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:21,378 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:21,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945470378] [2021-11-20 23:38:21,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1945470378] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:21,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1926946086] [2021-11-20 23:38:21,379 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:38:21,379 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:21,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:21,382 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:21,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-20 23:38:21,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:21,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-20 23:38:21,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:21,857 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:21,857 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:21,948 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:21,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1926946086] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:21,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1277742431] [2021-11-20 23:38:21,950 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:21,950 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:21,950 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:21,950 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:21,951 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:22,840 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:23,214 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:23,215 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:23,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 37 [2021-11-20 23:38:23,215 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336360361] [2021-11-20 23:38:23,215 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:23,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-20 23:38:23,215 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:23,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-20 23:38:23,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=316, Invalid=1754, Unknown=0, NotChecked=0, Total=2070 [2021-11-20 23:38:23,216 INFO L87 Difference]: Start difference. First operand 44 states and 53 transitions. Second operand has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:23,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:23,555 INFO L93 Difference]: Finished difference Result 104 states and 115 transitions. [2021-11-20 23:38:23,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-20 23:38:23,555 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-20 23:38:23,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:23,556 INFO L225 Difference]: With dead ends: 104 [2021-11-20 23:38:23,556 INFO L226 Difference]: Without dead ends: 77 [2021-11-20 23:38:23,557 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1266 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=599, Invalid=3183, Unknown=0, NotChecked=0, Total=3782 [2021-11-20 23:38:23,557 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 21 mSDsluCounter, 159 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:23,557 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 170 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:23,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-20 23:38:23,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 45. [2021-11-20 23:38:23,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:23,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2021-11-20 23:38:23,572 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2021-11-20 23:38:23,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:23,572 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2021-11-20 23:38:23,572 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:23,572 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2021-11-20 23:38:23,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-20 23:38:23,573 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:23,573 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:23,593 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-11-20 23:38:23,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-20 23:38:23,773 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:23,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:23,774 INFO L85 PathProgramCache]: Analyzing trace with hash 629765458, now seen corresponding path program 16 times [2021-11-20 23:38:23,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:23,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926396407] [2021-11-20 23:38:23,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:23,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:23,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:23,948 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 58 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:23,948 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:23,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1926396407] [2021-11-20 23:38:23,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1926396407] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:23,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1407537465] [2021-11-20 23:38:23,949 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:38:23,949 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:23,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:23,950 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:23,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-20 23:38:23,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:23,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-20 23:38:24,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:24,479 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:24,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:24,594 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:24,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1407537465] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:24,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1569760238] [2021-11-20 23:38:24,596 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:24,596 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:24,596 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:24,597 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:24,597 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:25,491 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:25,788 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:25,788 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:25,788 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 36 [2021-11-20 23:38:25,788 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534378032] [2021-11-20 23:38:25,788 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:25,789 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-20 23:38:25,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:25,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-20 23:38:25,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=1698, Unknown=0, NotChecked=0, Total=1980 [2021-11-20 23:38:25,790 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 37 states, 37 states have (on average 2.054054054054054) internal successors, (76), 36 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:26,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:26,219 INFO L93 Difference]: Finished difference Result 136 states and 148 transitions. [2021-11-20 23:38:26,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-20 23:38:26,220 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.054054054054054) internal successors, (76), 36 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-20 23:38:26,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:26,220 INFO L225 Difference]: With dead ends: 136 [2021-11-20 23:38:26,220 INFO L226 Difference]: Without dead ends: 109 [2021-11-20 23:38:26,221 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1469 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=664, Invalid=3758, Unknown=0, NotChecked=0, Total=4422 [2021-11-20 23:38:26,221 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 31 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:26,222 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 167 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:26,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-20 23:38:26,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 45. [2021-11-20 23:38:26,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:26,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2021-11-20 23:38:26,253 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2021-11-20 23:38:26,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:26,253 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2021-11-20 23:38:26,253 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.054054054054054) internal successors, (76), 36 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:26,254 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2021-11-20 23:38:26,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-20 23:38:26,254 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:26,254 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:26,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:26,474 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:26,474 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:26,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:26,474 INFO L85 PathProgramCache]: Analyzing trace with hash 1591724961, now seen corresponding path program 17 times [2021-11-20 23:38:26,474 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:26,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889213425] [2021-11-20 23:38:26,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:26,475 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:26,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:26,632 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 58 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:26,632 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:26,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889213425] [2021-11-20 23:38:26,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1889213425] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:26,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [167736345] [2021-11-20 23:38:26,632 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:38:26,632 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:26,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:26,633 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:26,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-20 23:38:26,673 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-20 23:38:26,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:26,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-20 23:38:26,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:27,041 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 77 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:27,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:27,161 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 77 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:27,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [167736345] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:27,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1677944011] [2021-11-20 23:38:27,162 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:27,162 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:27,162 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:27,162 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:27,162 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:28,103 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:28,406 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:28,407 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:28,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2021-11-20 23:38:28,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364900634] [2021-11-20 23:38:28,407 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:28,407 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-20 23:38:28,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:28,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-20 23:38:28,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=1628, Unknown=0, NotChecked=0, Total=1892 [2021-11-20 23:38:28,408 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 36 states, 36 states have (on average 2.0833333333333335) internal successors, (75), 35 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:28,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:28,905 INFO L93 Difference]: Finished difference Result 167 states and 180 transitions. [2021-11-20 23:38:28,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-20 23:38:28,905 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.0833333333333335) internal successors, (75), 35 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-20 23:38:28,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:28,906 INFO L225 Difference]: With dead ends: 167 [2021-11-20 23:38:28,906 INFO L226 Difference]: Without dead ends: 140 [2021-11-20 23:38:28,907 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1592 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=721, Invalid=4109, Unknown=0, NotChecked=0, Total=4830 [2021-11-20 23:38:28,907 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 52 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:28,908 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 140 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:28,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-20 23:38:28,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 45. [2021-11-20 23:38:28,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:28,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2021-11-20 23:38:28,935 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2021-11-20 23:38:28,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:28,935 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2021-11-20 23:38:28,935 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.0833333333333335) internal successors, (75), 35 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:28,935 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2021-11-20 23:38:28,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-20 23:38:28,936 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:28,936 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:28,963 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:29,154 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-20 23:38:29,154 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:29,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:29,154 INFO L85 PathProgramCache]: Analyzing trace with hash -1286738062, now seen corresponding path program 18 times [2021-11-20 23:38:29,154 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:29,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1925392480] [2021-11-20 23:38:29,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:29,155 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:29,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:29,307 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 58 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:29,307 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:29,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1925392480] [2021-11-20 23:38:29,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1925392480] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:29,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [233942133] [2021-11-20 23:38:29,307 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:38:29,308 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:29,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:29,310 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:29,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-20 23:38:29,359 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:38:29,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:29,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-20 23:38:29,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:29,720 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 77 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:29,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:29,815 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 77 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:29,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [233942133] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:29,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [121447162] [2021-11-20 23:38:29,816 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:29,816 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:29,817 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:29,817 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:29,817 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:30,738 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:31,046 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:31,049 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:31,049 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2021-11-20 23:38:31,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616318493] [2021-11-20 23:38:31,050 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:31,050 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-20 23:38:31,050 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:31,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-20 23:38:31,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=1556, Unknown=0, NotChecked=0, Total=1806 [2021-11-20 23:38:31,051 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 34 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:31,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:31,656 INFO L93 Difference]: Finished difference Result 197 states and 211 transitions. [2021-11-20 23:38:31,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-20 23:38:31,656 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 34 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-20 23:38:31,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:31,657 INFO L225 Difference]: With dead ends: 197 [2021-11-20 23:38:31,657 INFO L226 Difference]: Without dead ends: 170 [2021-11-20 23:38:31,658 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1618 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=741, Invalid=4229, Unknown=0, NotChecked=0, Total=4970 [2021-11-20 23:38:31,658 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 58 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:31,659 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 156 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:31,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-20 23:38:31,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 45. [2021-11-20 23:38:31,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:31,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2021-11-20 23:38:31,688 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2021-11-20 23:38:31,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:31,688 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2021-11-20 23:38:31,689 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 34 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:31,689 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2021-11-20 23:38:31,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-20 23:38:31,689 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:31,689 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:31,715 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:31,898 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-20 23:38:31,898 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:31,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:31,899 INFO L85 PathProgramCache]: Analyzing trace with hash -409760383, now seen corresponding path program 19 times [2021-11-20 23:38:31,899 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:31,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296817737] [2021-11-20 23:38:31,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:31,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:31,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:32,052 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 58 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:32,052 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:32,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296817737] [2021-11-20 23:38:32,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [296817737] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:32,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [37618666] [2021-11-20 23:38:32,053 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:38:32,053 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:32,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:32,066 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:32,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-20 23:38:32,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:32,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-20 23:38:32,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:32,453 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 77 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:32,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:32,546 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 77 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:32,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [37618666] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:32,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1805866713] [2021-11-20 23:38:32,547 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:32,547 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:32,547 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:32,547 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:32,547 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:33,502 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:33,801 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:33,801 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:33,801 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 33 [2021-11-20 23:38:33,801 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215133220] [2021-11-20 23:38:33,801 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:33,802 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-20 23:38:33,802 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:33,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-20 23:38:33,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=1482, Unknown=0, NotChecked=0, Total=1722 [2021-11-20 23:38:33,802 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 33 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:34,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:34,426 INFO L93 Difference]: Finished difference Result 226 states and 241 transitions. [2021-11-20 23:38:34,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-20 23:38:34,426 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 33 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-20 23:38:34,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:34,427 INFO L225 Difference]: With dead ends: 226 [2021-11-20 23:38:34,428 INFO L226 Difference]: Without dead ends: 199 [2021-11-20 23:38:34,428 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1546 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=721, Invalid=4109, Unknown=0, NotChecked=0, Total=4830 [2021-11-20 23:38:34,429 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 107 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:34,429 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 129 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:34,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-11-20 23:38:34,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 45. [2021-11-20 23:38:34,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:34,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2021-11-20 23:38:34,460 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2021-11-20 23:38:34,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:34,460 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2021-11-20 23:38:34,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 33 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:34,461 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2021-11-20 23:38:34,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-20 23:38:34,461 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:34,461 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:34,501 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:34,677 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-20 23:38:34,677 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:34,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:34,678 INFO L85 PathProgramCache]: Analyzing trace with hash -2044038766, now seen corresponding path program 20 times [2021-11-20 23:38:34,678 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:34,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089141970] [2021-11-20 23:38:34,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:34,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:34,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:34,852 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 58 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:34,852 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:34,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089141970] [2021-11-20 23:38:34,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1089141970] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:34,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1493105913] [2021-11-20 23:38:34,853 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:38:34,853 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:34,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:34,854 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:34,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-20 23:38:34,911 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-20 23:38:34,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:34,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-20 23:38:34,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:35,377 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 77 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:35,377 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:35,501 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 77 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:35,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1493105913] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:35,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1900797274] [2021-11-20 23:38:35,503 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:35,503 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:35,503 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:35,503 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:35,503 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:36,613 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:36,905 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:36,905 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:36,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 32 [2021-11-20 23:38:36,915 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440312968] [2021-11-20 23:38:36,915 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:36,916 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-20 23:38:36,916 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:36,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-20 23:38:36,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=1406, Unknown=0, NotChecked=0, Total=1640 [2021-11-20 23:38:36,916 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 33 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 32 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:37,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:37,437 INFO L93 Difference]: Finished difference Result 254 states and 270 transitions. [2021-11-20 23:38:37,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-20 23:38:37,438 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 32 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-20 23:38:37,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:37,439 INFO L225 Difference]: With dead ends: 254 [2021-11-20 23:38:37,439 INFO L226 Difference]: Without dead ends: 227 [2021-11-20 23:38:37,440 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1379 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=664, Invalid=3758, Unknown=0, NotChecked=0, Total=4422 [2021-11-20 23:38:37,441 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 92 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:37,441 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 151 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 229 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:37,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-11-20 23:38:37,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 45. [2021-11-20 23:38:37,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:37,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2021-11-20 23:38:37,462 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2021-11-20 23:38:37,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:37,462 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2021-11-20 23:38:37,462 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 32 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:37,462 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2021-11-20 23:38:37,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-20 23:38:37,463 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:37,463 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:37,483 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2021-11-20 23:38:37,663 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-11-20 23:38:37,663 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:37,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:37,664 INFO L85 PathProgramCache]: Analyzing trace with hash -1542568095, now seen corresponding path program 21 times [2021-11-20 23:38:37,664 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:37,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [21092958] [2021-11-20 23:38:37,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:37,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:37,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:37,845 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 58 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:37,845 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:37,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [21092958] [2021-11-20 23:38:37,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [21092958] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:37,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510179566] [2021-11-20 23:38:37,846 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:38:37,846 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:37,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:37,846 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:37,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-20 23:38:37,882 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:38:37,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:37,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-20 23:38:37,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:38,243 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:38,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:38,334 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:38,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510179566] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:38,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2074669996] [2021-11-20 23:38:38,335 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:38,335 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:38,335 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:38,335 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:38,335 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:39,241 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:39,539 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:39,539 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:39,539 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 31 [2021-11-20 23:38:39,539 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942766385] [2021-11-20 23:38:39,539 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:39,539 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-20 23:38:39,540 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:39,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-20 23:38:39,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=1328, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 23:38:39,540 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 32 states, 32 states have (on average 2.21875) internal successors, (71), 31 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:40,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:40,041 INFO L93 Difference]: Finished difference Result 281 states and 298 transitions. [2021-11-20 23:38:40,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-20 23:38:40,041 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.21875) internal successors, (71), 31 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-20 23:38:40,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:40,042 INFO L225 Difference]: With dead ends: 281 [2021-11-20 23:38:40,042 INFO L226 Difference]: Without dead ends: 254 [2021-11-20 23:38:40,042 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1116 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=579, Invalid=3203, Unknown=0, NotChecked=0, Total=3782 [2021-11-20 23:38:40,043 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 108 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:40,043 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 160 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:40,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-11-20 23:38:40,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 45. [2021-11-20 23:38:40,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:40,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2021-11-20 23:38:40,070 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2021-11-20 23:38:40,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:40,070 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2021-11-20 23:38:40,070 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.21875) internal successors, (71), 31 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:40,070 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2021-11-20 23:38:40,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-20 23:38:40,071 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:40,071 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:40,097 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:40,286 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:40,286 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:40,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:40,286 INFO L85 PathProgramCache]: Analyzing trace with hash -1803486286, now seen corresponding path program 7 times [2021-11-20 23:38:40,286 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:40,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477490889] [2021-11-20 23:38:40,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:40,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:40,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:40,449 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 58 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:40,449 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:40,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477490889] [2021-11-20 23:38:40,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [477490889] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:40,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1495948818] [2021-11-20 23:38:40,450 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:38:40,450 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:40,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:40,451 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:40,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-20 23:38:40,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:40,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-20 23:38:40,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:40,797 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:40,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:40,899 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:40,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1495948818] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:40,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1183273711] [2021-11-20 23:38:40,901 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:40,901 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:40,901 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:40,901 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:40,901 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:41,714 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:42,044 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:42,044 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:42,044 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 30 [2021-11-20 23:38:42,044 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249391830] [2021-11-20 23:38:42,044 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:42,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-20 23:38:42,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:42,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-20 23:38:42,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=1249, Unknown=0, NotChecked=0, Total=1482 [2021-11-20 23:38:42,045 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 31 states, 31 states have (on average 2.225806451612903) internal successors, (69), 30 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:42,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:42,572 INFO L93 Difference]: Finished difference Result 309 states and 328 transitions. [2021-11-20 23:38:42,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-20 23:38:42,572 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.225806451612903) internal successors, (69), 30 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-20 23:38:42,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:42,574 INFO L225 Difference]: With dead ends: 309 [2021-11-20 23:38:42,574 INFO L226 Difference]: Without dead ends: 282 [2021-11-20 23:38:42,575 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 821 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=488, Invalid=2482, Unknown=0, NotChecked=0, Total=2970 [2021-11-20 23:38:42,578 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 106 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:42,579 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 140 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:42,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2021-11-20 23:38:42,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 46. [2021-11-20 23:38:42,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.2444444444444445) internal successors, (56), 45 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:42,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 56 transitions. [2021-11-20 23:38:42,611 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 56 transitions. Word has length 36 [2021-11-20 23:38:42,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:42,611 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 56 transitions. [2021-11-20 23:38:42,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.225806451612903) internal successors, (69), 30 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:42,611 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 56 transitions. [2021-11-20 23:38:42,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-20 23:38:42,612 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:42,612 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:42,633 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2021-11-20 23:38:42,813 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:42,814 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:42,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:42,814 INFO L85 PathProgramCache]: Analyzing trace with hash 1960887109, now seen corresponding path program 14 times [2021-11-20 23:38:42,814 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:42,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [606916274] [2021-11-20 23:38:42,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:42,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:42,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:42,911 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:42,911 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:42,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [606916274] [2021-11-20 23:38:42,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [606916274] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:42,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [779773119] [2021-11-20 23:38:42,912 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:38:42,912 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:42,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:42,913 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:42,936 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-20 23:38:42,977 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-20 23:38:42,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:42,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-20 23:38:42,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:43,074 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:43,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:43,166 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:43,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [779773119] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:43,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [225079111] [2021-11-20 23:38:43,168 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:43,168 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:43,169 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:43,169 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:43,169 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:44,157 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:44,448 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:44,448 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:44,449 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 12 [2021-11-20 23:38:44,449 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70587575] [2021-11-20 23:38:44,449 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:44,449 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-20 23:38:44,449 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:44,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-20 23:38:44,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=327, Unknown=0, NotChecked=0, Total=420 [2021-11-20 23:38:44,450 INFO L87 Difference]: Start difference. First operand 46 states and 56 transitions. Second operand has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:44,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:44,652 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-11-20 23:38:44,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-20 23:38:44,653 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-20 23:38:44,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:44,653 INFO L225 Difference]: With dead ends: 57 [2021-11-20 23:38:44,653 INFO L226 Difference]: Without dead ends: 55 [2021-11-20 23:38:44,654 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=226, Invalid=704, Unknown=0, NotChecked=0, Total=930 [2021-11-20 23:38:44,654 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 42 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:44,654 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 18 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:44,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-20 23:38:44,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 49. [2021-11-20 23:38:44,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.2291666666666667) internal successors, (59), 48 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:44,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 59 transitions. [2021-11-20 23:38:44,677 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 59 transitions. Word has length 37 [2021-11-20 23:38:44,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:44,677 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 59 transitions. [2021-11-20 23:38:44,677 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:44,677 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 59 transitions. [2021-11-20 23:38:44,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-20 23:38:44,678 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:44,678 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:44,701 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:44,878 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:44,878 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:44,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:44,879 INFO L85 PathProgramCache]: Analyzing trace with hash 942514443, now seen corresponding path program 15 times [2021-11-20 23:38:44,879 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:44,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1347732232] [2021-11-20 23:38:44,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:44,880 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:44,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:45,078 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 78 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:45,079 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:45,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1347732232] [2021-11-20 23:38:45,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1347732232] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:45,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [444968845] [2021-11-20 23:38:45,079 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:38:45,079 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:45,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:45,086 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:45,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-20 23:38:45,131 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:38:45,132 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:45,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 23:38:45,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:45,641 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:45,641 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:45,746 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:45,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [444968845] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:45,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1710049190] [2021-11-20 23:38:45,748 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:45,748 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:45,748 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:45,748 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:45,748 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:46,644 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:47,026 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:47,026 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:47,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 41 [2021-11-20 23:38:47,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793755091] [2021-11-20 23:38:47,027 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:47,027 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-20 23:38:47,027 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:47,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-20 23:38:47,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=2074, Unknown=0, NotChecked=0, Total=2450 [2021-11-20 23:38:47,028 INFO L87 Difference]: Start difference. First operand 49 states and 59 transitions. Second operand has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:47,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:47,424 INFO L93 Difference]: Finished difference Result 116 states and 128 transitions. [2021-11-20 23:38:47,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-20 23:38:47,424 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-20 23:38:47,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:47,424 INFO L225 Difference]: With dead ends: 116 [2021-11-20 23:38:47,424 INFO L226 Difference]: Without dead ends: 86 [2021-11-20 23:38:47,425 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1546 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=721, Invalid=3835, Unknown=0, NotChecked=0, Total=4556 [2021-11-20 23:38:47,425 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 16 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:47,425 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 145 Invalid, 259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 243 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:47,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-20 23:38:47,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 50. [2021-11-20 23:38:47,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:47,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2021-11-20 23:38:47,452 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2021-11-20 23:38:47,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:47,452 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2021-11-20 23:38:47,452 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:47,452 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2021-11-20 23:38:47,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-20 23:38:47,452 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:47,452 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:47,473 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2021-11-20 23:38:47,653 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:47,653 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:47,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:47,653 INFO L85 PathProgramCache]: Analyzing trace with hash -1406409700, now seen corresponding path program 22 times [2021-11-20 23:38:47,653 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:47,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1704631010] [2021-11-20 23:38:47,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:47,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:47,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:47,829 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:47,829 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:47,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1704631010] [2021-11-20 23:38:47,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1704631010] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:47,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [201156412] [2021-11-20 23:38:47,829 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:38:47,829 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:47,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:47,830 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:47,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-20 23:38:47,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:47,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 23:38:47,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:48,314 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 100 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:48,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:48,418 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 100 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:48,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [201156412] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:48,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2020350047] [2021-11-20 23:38:48,419 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:48,419 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:48,419 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:48,419 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:48,419 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:49,351 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:49,674 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:49,674 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:49,674 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 40 [2021-11-20 23:38:49,674 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197828797] [2021-11-20 23:38:49,675 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:49,675 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-20 23:38:49,675 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:49,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-20 23:38:49,675 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=2013, Unknown=0, NotChecked=0, Total=2352 [2021-11-20 23:38:49,675 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 41 states, 41 states have (on average 2.048780487804878) internal successors, (84), 40 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:50,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:50,234 INFO L93 Difference]: Finished difference Result 152 states and 165 transitions. [2021-11-20 23:38:50,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-20 23:38:50,235 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.048780487804878) internal successors, (84), 40 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-20 23:38:50,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:50,235 INFO L225 Difference]: With dead ends: 152 [2021-11-20 23:38:50,235 INFO L226 Difference]: Without dead ends: 122 [2021-11-20 23:38:50,236 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1821 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=814, Invalid=4588, Unknown=0, NotChecked=0, Total=5402 [2021-11-20 23:38:50,236 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 31 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 259 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:50,237 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 154 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 259 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:50,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-20 23:38:50,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 50. [2021-11-20 23:38:50,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:50,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2021-11-20 23:38:50,268 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2021-11-20 23:38:50,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:50,269 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2021-11-20 23:38:50,269 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.048780487804878) internal successors, (84), 40 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:50,269 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2021-11-20 23:38:50,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-20 23:38:50,269 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:50,269 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:50,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:50,486 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-20 23:38:50,486 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:50,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:50,486 INFO L85 PathProgramCache]: Analyzing trace with hash 180386539, now seen corresponding path program 23 times [2021-11-20 23:38:50,486 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:50,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1963206467] [2021-11-20 23:38:50,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:50,487 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:50,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:50,691 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 78 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:50,691 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:50,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1963206467] [2021-11-20 23:38:50,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1963206467] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:50,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [148788739] [2021-11-20 23:38:50,691 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:38:50,691 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:50,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:50,694 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:50,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-20 23:38:50,740 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-20 23:38:50,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:50,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 23:38:50,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:51,161 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 100 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:51,161 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:51,259 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 100 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:51,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [148788739] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:51,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1388647967] [2021-11-20 23:38:51,260 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:51,260 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:51,261 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:51,261 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:51,261 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:52,097 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:52,405 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:52,405 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:52,405 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2021-11-20 23:38:52,405 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737280092] [2021-11-20 23:38:52,405 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:52,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-20 23:38:52,406 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:52,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-20 23:38:52,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=1938, Unknown=0, NotChecked=0, Total=2256 [2021-11-20 23:38:52,406 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 40 states, 40 states have (on average 2.075) internal successors, (83), 39 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:53,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:53,004 INFO L93 Difference]: Finished difference Result 187 states and 201 transitions. [2021-11-20 23:38:53,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-20 23:38:53,004 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.075) internal successors, (83), 39 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-20 23:38:53,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:53,005 INFO L225 Difference]: With dead ends: 187 [2021-11-20 23:38:53,006 INFO L226 Difference]: Without dead ends: 157 [2021-11-20 23:38:53,006 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2014 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=900, Invalid=5106, Unknown=0, NotChecked=0, Total=6006 [2021-11-20 23:38:53,007 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 57 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:53,007 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 162 Invalid, 344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 291 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:53,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-11-20 23:38:53,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 50. [2021-11-20 23:38:53,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:53,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2021-11-20 23:38:53,037 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2021-11-20 23:38:53,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:53,037 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2021-11-20 23:38:53,037 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.075) internal successors, (83), 39 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:53,037 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2021-11-20 23:38:53,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-20 23:38:53,038 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:53,038 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:53,075 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:53,258 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-20 23:38:53,258 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:53,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:53,258 INFO L85 PathProgramCache]: Analyzing trace with hash 1894141500, now seen corresponding path program 24 times [2021-11-20 23:38:53,258 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:53,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797540716] [2021-11-20 23:38:53,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:53,259 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:53,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:53,430 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 78 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:53,431 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:53,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797540716] [2021-11-20 23:38:53,431 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [797540716] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:53,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380118512] [2021-11-20 23:38:53,431 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:38:53,431 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:53,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:53,432 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:53,433 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-20 23:38:53,470 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:38:53,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:53,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 23:38:53,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:53,886 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 100 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:53,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:53,989 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 100 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:53,989 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [380118512] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:53,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1714459827] [2021-11-20 23:38:53,990 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:53,990 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:53,990 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:53,991 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:53,991 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:55,020 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:55,378 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:55,378 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:55,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2021-11-20 23:38:55,378 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738957263] [2021-11-20 23:38:55,378 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:55,378 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-20 23:38:55,378 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:55,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-20 23:38:55,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=1861, Unknown=0, NotChecked=0, Total=2162 [2021-11-20 23:38:55,379 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:56,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:56,051 INFO L93 Difference]: Finished difference Result 221 states and 236 transitions. [2021-11-20 23:38:56,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-20 23:38:56,051 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-20 23:38:56,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:56,052 INFO L225 Difference]: With dead ends: 221 [2021-11-20 23:38:56,052 INFO L226 Difference]: Without dead ends: 191 [2021-11-20 23:38:56,053 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2102 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=946, Invalid=5374, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 23:38:56,054 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 70 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 281 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 345 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:56,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 184 Invalid, 345 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 281 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:56,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-20 23:38:56,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 50. [2021-11-20 23:38:56,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:56,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2021-11-20 23:38:56,083 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2021-11-20 23:38:56,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:56,084 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2021-11-20 23:38:56,084 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:56,084 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2021-11-20 23:38:56,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-20 23:38:56,084 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:56,085 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:56,120 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:56,303 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:56,304 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:56,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:56,304 INFO L85 PathProgramCache]: Analyzing trace with hash -1375712053, now seen corresponding path program 25 times [2021-11-20 23:38:56,304 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:56,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962511868] [2021-11-20 23:38:56,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:56,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:56,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:56,496 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 78 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:56,497 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:56,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962511868] [2021-11-20 23:38:56,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [962511868] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:56,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [260380638] [2021-11-20 23:38:56,497 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:38:56,497 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:56,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:56,502 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:56,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-20 23:38:56,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:56,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 23:38:56,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:57,000 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 100 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:57,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:57,121 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 100 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:57,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [260380638] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:57,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [961054247] [2021-11-20 23:38:57,122 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:38:57,122 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:57,122 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:57,122 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:57,122 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:58,041 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:58,345 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:58,345 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:58,345 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 37 [2021-11-20 23:38:58,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292182498] [2021-11-20 23:38:58,346 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:58,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-20 23:38:58,346 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:58,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-20 23:38:58,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=1782, Unknown=0, NotChecked=0, Total=2070 [2021-11-20 23:38:58,347 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:59,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:59,035 INFO L93 Difference]: Finished difference Result 254 states and 270 transitions. [2021-11-20 23:38:59,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-20 23:38:59,035 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-20 23:38:59,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:59,036 INFO L225 Difference]: With dead ends: 254 [2021-11-20 23:38:59,037 INFO L226 Difference]: Without dead ends: 224 [2021-11-20 23:38:59,037 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2079 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=946, Invalid=5374, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 23:38:59,038 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 108 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:59,038 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 163 Invalid, 343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:59,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-11-20 23:38:59,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 50. [2021-11-20 23:38:59,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:59,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2021-11-20 23:38:59,082 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2021-11-20 23:38:59,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:59,082 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2021-11-20 23:38:59,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:59,082 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2021-11-20 23:38:59,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-20 23:38:59,083 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:59,083 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:59,105 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:59,283 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-20 23:38:59,283 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:59,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:59,284 INFO L85 PathProgramCache]: Analyzing trace with hash -1619738532, now seen corresponding path program 26 times [2021-11-20 23:38:59,284 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:59,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1601738840] [2021-11-20 23:38:59,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:59,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:59,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:59,477 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 78 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:59,477 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:59,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1601738840] [2021-11-20 23:38:59,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1601738840] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:59,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1268979346] [2021-11-20 23:38:59,477 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:38:59,478 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:59,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:59,478 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:59,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-20 23:38:59,539 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-20 23:38:59,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:59,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 23:38:59,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:00,036 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 100 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:00,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:00,164 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 100 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:00,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1268979346] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:00,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [35404050] [2021-11-20 23:39:00,166 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:00,166 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:00,166 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:00,166 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:00,166 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:01,172 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:01,540 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:01,541 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:01,541 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 36 [2021-11-20 23:39:01,541 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619451559] [2021-11-20 23:39:01,541 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:01,541 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-20 23:39:01,541 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:01,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-20 23:39:01,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=279, Invalid=1701, Unknown=0, NotChecked=0, Total=1980 [2021-11-20 23:39:01,542 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 37 states, 37 states have (on average 2.1621621621621623) internal successors, (80), 36 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:02,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:02,286 INFO L93 Difference]: Finished difference Result 286 states and 303 transitions. [2021-11-20 23:39:02,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-20 23:39:02,286 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.1621621621621623) internal successors, (80), 36 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-20 23:39:02,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:02,287 INFO L225 Difference]: With dead ends: 286 [2021-11-20 23:39:02,287 INFO L226 Difference]: Without dead ends: 256 [2021-11-20 23:39:02,288 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1942 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=900, Invalid=5106, Unknown=0, NotChecked=0, Total=6006 [2021-11-20 23:39:02,288 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 86 mSDsluCounter, 228 mSDsCounter, 0 mSdLazyCounter, 364 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 428 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 364 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:02,289 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 239 Invalid, 428 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 364 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:39:02,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-11-20 23:39:02,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 50. [2021-11-20 23:39:02,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:02,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2021-11-20 23:39:02,337 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2021-11-20 23:39:02,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:02,337 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2021-11-20 23:39:02,338 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.1621621621621623) internal successors, (80), 36 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:02,338 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2021-11-20 23:39:02,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-20 23:39:02,338 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:02,338 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:02,373 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-20 23:39:02,558 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-20 23:39:02,558 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:02,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:02,558 INFO L85 PathProgramCache]: Analyzing trace with hash -657779029, now seen corresponding path program 27 times [2021-11-20 23:39:02,558 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:02,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2067289579] [2021-11-20 23:39:02,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:02,559 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:02,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:02,749 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 78 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:02,749 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:02,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2067289579] [2021-11-20 23:39:02,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2067289579] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:02,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [896438617] [2021-11-20 23:39:02,750 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:39:02,750 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:02,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:02,751 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:02,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-20 23:39:02,804 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:39:02,804 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:39:02,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 23:39:02,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:03,268 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 100 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:03,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:03,397 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 100 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:03,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [896438617] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:03,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [404062600] [2021-11-20 23:39:03,399 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:03,399 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:03,399 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:03,400 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:03,400 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:04,450 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:04,771 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:04,771 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:04,772 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 35 [2021-11-20 23:39:04,772 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338011618] [2021-11-20 23:39:04,772 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:04,772 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-20 23:39:04,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:04,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-20 23:39:04,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=1618, Unknown=0, NotChecked=0, Total=1892 [2021-11-20 23:39:04,774 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 36 states, 36 states have (on average 2.1944444444444446) internal successors, (79), 35 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:05,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:05,545 INFO L93 Difference]: Finished difference Result 317 states and 335 transitions. [2021-11-20 23:39:05,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-20 23:39:05,545 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.1944444444444446) internal successors, (79), 35 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-20 23:39:05,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:05,547 INFO L225 Difference]: With dead ends: 317 [2021-11-20 23:39:05,547 INFO L226 Difference]: Without dead ends: 287 [2021-11-20 23:39:05,547 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1700 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=814, Invalid=4588, Unknown=0, NotChecked=0, Total=5402 [2021-11-20 23:39:05,548 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 126 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:05,548 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 168 Invalid, 335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 262 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:39:05,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2021-11-20 23:39:05,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 50. [2021-11-20 23:39:05,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:05,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2021-11-20 23:39:05,588 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2021-11-20 23:39:05,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:05,588 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2021-11-20 23:39:05,589 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.1944444444444446) internal successors, (79), 35 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:05,589 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2021-11-20 23:39:05,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-20 23:39:05,589 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:05,589 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:05,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-20 23:39:05,814 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:05,814 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:05,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:05,814 INFO L85 PathProgramCache]: Analyzing trace with hash 758725244, now seen corresponding path program 28 times [2021-11-20 23:39:05,814 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:05,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1471808579] [2021-11-20 23:39:05,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:05,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:05,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:06,012 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:06,012 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:06,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1471808579] [2021-11-20 23:39:06,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1471808579] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:06,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [342709326] [2021-11-20 23:39:06,013 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:39:06,013 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:06,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:06,015 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:06,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-20 23:39:06,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:06,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 23:39:06,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:06,482 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 100 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:06,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:06,580 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 100 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:06,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [342709326] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:06,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1871643722] [2021-11-20 23:39:06,581 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:06,582 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:06,582 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:06,582 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:06,582 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:07,462 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:07,773 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:07,773 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:07,773 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 34 [2021-11-20 23:39:07,773 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794752157] [2021-11-20 23:39:07,773 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:07,774 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-20 23:39:07,774 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:07,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-20 23:39:07,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=1533, Unknown=0, NotChecked=0, Total=1806 [2021-11-20 23:39:07,775 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 35 states, 35 states have (on average 2.2285714285714286) internal successors, (78), 34 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:08,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:08,444 INFO L93 Difference]: Finished difference Result 347 states and 366 transitions. [2021-11-20 23:39:08,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-20 23:39:08,444 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.2285714285714286) internal successors, (78), 34 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-20 23:39:08,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:08,446 INFO L225 Difference]: With dead ends: 347 [2021-11-20 23:39:08,446 INFO L226 Difference]: Without dead ends: 317 [2021-11-20 23:39:08,446 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1356 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=700, Invalid=3856, Unknown=0, NotChecked=0, Total=4556 [2021-11-20 23:39:08,447 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 137 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:08,447 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 185 Invalid, 336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 279 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:39:08,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-11-20 23:39:08,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 50. [2021-11-20 23:39:08,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:08,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2021-11-20 23:39:08,496 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2021-11-20 23:39:08,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:08,496 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2021-11-20 23:39:08,496 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.2285714285714286) internal successors, (78), 34 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:08,497 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2021-11-20 23:39:08,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-20 23:39:08,497 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:08,497 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:08,524 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2021-11-20 23:39:08,714 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2021-11-20 23:39:08,714 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:08,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:08,714 INFO L85 PathProgramCache]: Analyzing trace with hash 1635702923, now seen corresponding path program 8 times [2021-11-20 23:39:08,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:08,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209972831] [2021-11-20 23:39:08,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:08,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:08,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:08,903 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 78 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:08,903 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:08,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209972831] [2021-11-20 23:39:08,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [209972831] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:08,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [214918047] [2021-11-20 23:39:08,903 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:39:08,903 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:08,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:08,910 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:08,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-20 23:39:08,967 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-20 23:39:08,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:39:08,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 23:39:08,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:09,315 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:09,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:09,413 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:09,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [214918047] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:09,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1388277769] [2021-11-20 23:39:09,414 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:09,414 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:09,414 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:09,415 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:09,415 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:10,194 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:10,527 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:10,527 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:10,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 33 [2021-11-20 23:39:10,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446050627] [2021-11-20 23:39:10,527 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:10,527 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-20 23:39:10,527 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:10,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-20 23:39:10,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=1447, Unknown=0, NotChecked=0, Total=1722 [2021-11-20 23:39:10,528 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 33 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:11,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:11,196 INFO L93 Difference]: Finished difference Result 378 states and 399 transitions. [2021-11-20 23:39:11,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-20 23:39:11,197 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 33 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-20 23:39:11,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:11,198 INFO L225 Difference]: With dead ends: 378 [2021-11-20 23:39:11,198 INFO L226 Difference]: Without dead ends: 348 [2021-11-20 23:39:11,199 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 986 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=584, Invalid=2956, Unknown=0, NotChecked=0, Total=3540 [2021-11-20 23:39:11,199 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 214 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:11,199 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [214 Valid, 145 Invalid, 272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:39:11,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2021-11-20 23:39:11,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 51. [2021-11-20 23:39:11,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.24) internal successors, (62), 50 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:11,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 62 transitions. [2021-11-20 23:39:11,250 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 62 transitions. Word has length 40 [2021-11-20 23:39:11,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:11,250 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 62 transitions. [2021-11-20 23:39:11,250 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 33 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:11,250 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 62 transitions. [2021-11-20 23:39:11,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-20 23:39:11,250 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:11,251 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:11,270 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-20 23:39:11,451 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:11,451 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:11,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:11,451 INFO L85 PathProgramCache]: Analyzing trace with hash -1032519537, now seen corresponding path program 16 times [2021-11-20 23:39:11,451 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:11,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685540938] [2021-11-20 23:39:11,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:11,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:11,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:11,547 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 45 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:11,547 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:11,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685540938] [2021-11-20 23:39:11,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [685540938] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:11,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1407076277] [2021-11-20 23:39:11,548 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:39:11,548 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:11,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:11,549 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:11,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-20 23:39:11,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:11,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-20 23:39:11,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:11,700 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 45 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:11,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:11,794 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 45 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:11,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1407076277] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:11,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [634826885] [2021-11-20 23:39:11,795 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:11,796 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:11,796 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:11,796 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:11,796 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:12,714 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:13,004 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:13,005 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:13,005 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 13 [2021-11-20 23:39:13,005 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699813404] [2021-11-20 23:39:13,005 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:13,005 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-20 23:39:13,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:13,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-20 23:39:13,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2021-11-20 23:39:13,006 INFO L87 Difference]: Start difference. First operand 51 states and 62 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:13,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:13,217 INFO L93 Difference]: Finished difference Result 62 states and 73 transitions. [2021-11-20 23:39:13,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-20 23:39:13,217 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-20 23:39:13,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:13,218 INFO L225 Difference]: With dead ends: 62 [2021-11-20 23:39:13,218 INFO L226 Difference]: Without dead ends: 60 [2021-11-20 23:39:13,218 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 119 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=261, Invalid=795, Unknown=0, NotChecked=0, Total=1056 [2021-11-20 23:39:13,219 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 45 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:13,219 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 26 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 179 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:39:13,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-20 23:39:13,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2021-11-20 23:39:13,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.2264150943396226) internal successors, (65), 53 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:13,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 65 transitions. [2021-11-20 23:39:13,260 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 65 transitions. Word has length 41 [2021-11-20 23:39:13,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:13,260 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 65 transitions. [2021-11-20 23:39:13,261 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:13,261 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 65 transitions. [2021-11-20 23:39:13,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-20 23:39:13,261 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:13,261 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:13,281 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-20 23:39:13,461 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:13,461 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:13,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:13,462 INFO L85 PathProgramCache]: Analyzing trace with hash 771090305, now seen corresponding path program 17 times [2021-11-20 23:39:13,462 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:13,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2071890012] [2021-11-20 23:39:13,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:13,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:13,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:13,657 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 101 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:13,657 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:13,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2071890012] [2021-11-20 23:39:13,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2071890012] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:13,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2076045391] [2021-11-20 23:39:13,658 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:39:13,658 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:13,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:13,659 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:13,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-20 23:39:13,700 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-20 23:39:13,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:39:13,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:39:13,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:14,218 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:14,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:14,334 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:14,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2076045391] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:14,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1577488326] [2021-11-20 23:39:14,335 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:14,335 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:14,335 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:14,335 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:14,335 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:15,321 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:15,733 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:15,733 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:15,733 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 45 [2021-11-20 23:39:15,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063012135] [2021-11-20 23:39:15,733 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:15,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-20 23:39:15,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:15,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-20 23:39:15,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=442, Invalid=2420, Unknown=0, NotChecked=0, Total=2862 [2021-11-20 23:39:15,734 INFO L87 Difference]: Start difference. First operand 54 states and 65 transitions. Second operand has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:16,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:16,220 INFO L93 Difference]: Finished difference Result 128 states and 141 transitions. [2021-11-20 23:39:16,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-20 23:39:16,220 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-20 23:39:16,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:16,221 INFO L225 Difference]: With dead ends: 128 [2021-11-20 23:39:16,221 INFO L226 Difference]: Without dead ends: 95 [2021-11-20 23:39:16,221 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1853 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=855, Invalid=4547, Unknown=0, NotChecked=0, Total=5402 [2021-11-20 23:39:16,222 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 27 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:16,222 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 154 Invalid, 307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 279 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:39:16,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-20 23:39:16,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 55. [2021-11-20 23:39:16,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:16,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2021-11-20 23:39:16,288 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2021-11-20 23:39:16,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:16,288 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2021-11-20 23:39:16,288 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:16,288 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2021-11-20 23:39:16,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-20 23:39:16,289 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:16,289 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:16,325 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-20 23:39:16,502 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:16,502 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:16,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:16,502 INFO L85 PathProgramCache]: Analyzing trace with hash 604650002, now seen corresponding path program 29 times [2021-11-20 23:39:16,502 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:16,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284439851] [2021-11-20 23:39:16,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:16,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:16,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:16,736 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 101 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:16,736 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:16,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284439851] [2021-11-20 23:39:16,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1284439851] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:16,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1789881807] [2021-11-20 23:39:16,736 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:39:16,736 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:16,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:16,737 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:16,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-20 23:39:16,782 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-20 23:39:16,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:39:16,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:39:16,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:17,308 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 126 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:17,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:17,438 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 126 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:17,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1789881807] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:17,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1665418171] [2021-11-20 23:39:17,439 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:17,440 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:17,440 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:17,440 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:17,440 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:18,342 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:18,669 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:18,669 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:18,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 44 [2021-11-20 23:39:18,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165912936] [2021-11-20 23:39:18,669 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:18,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-20 23:39:18,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:18,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-20 23:39:18,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=402, Invalid=2354, Unknown=0, NotChecked=0, Total=2756 [2021-11-20 23:39:18,671 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 45 states, 45 states have (on average 2.0444444444444443) internal successors, (92), 44 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:19,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:19,282 INFO L93 Difference]: Finished difference Result 168 states and 182 transitions. [2021-11-20 23:39:19,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-20 23:39:19,282 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.0444444444444443) internal successors, (92), 44 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-20 23:39:19,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:19,283 INFO L225 Difference]: With dead ends: 168 [2021-11-20 23:39:19,283 INFO L226 Difference]: Without dead ends: 135 [2021-11-20 23:39:19,284 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2210 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=980, Invalid=5500, Unknown=0, NotChecked=0, Total=6480 [2021-11-20 23:39:19,284 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 39 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:19,284 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 183 Invalid, 366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:39:19,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-20 23:39:19,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 55. [2021-11-20 23:39:19,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:19,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2021-11-20 23:39:19,334 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2021-11-20 23:39:19,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:19,334 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2021-11-20 23:39:19,334 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.0444444444444443) internal successors, (92), 44 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:19,334 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2021-11-20 23:39:19,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-20 23:39:19,334 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:19,334 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:19,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-20 23:39:19,534 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:19,535 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:19,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:19,535 INFO L85 PathProgramCache]: Analyzing trace with hash 1707659617, now seen corresponding path program 30 times [2021-11-20 23:39:19,535 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:19,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [240539740] [2021-11-20 23:39:19,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:19,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:19,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:19,718 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 101 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:19,718 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:19,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [240539740] [2021-11-20 23:39:19,718 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [240539740] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:19,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1181163775] [2021-11-20 23:39:19,718 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:39:19,718 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:19,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:19,719 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:19,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-20 23:39:19,759 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:39:19,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:39:19,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:39:19,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:20,268 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 126 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:20,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:20,380 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 126 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:20,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1181163775] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:20,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2138835843] [2021-11-20 23:39:20,381 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:20,381 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:20,382 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:20,382 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:20,382 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:21,327 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:21,671 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:21,671 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:21,671 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2021-11-20 23:39:21,671 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143408786] [2021-11-20 23:39:21,672 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:21,672 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-20 23:39:21,672 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:21,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-20 23:39:21,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=2274, Unknown=0, NotChecked=0, Total=2652 [2021-11-20 23:39:21,672 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 44 states, 44 states have (on average 2.0681818181818183) internal successors, (91), 43 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:22,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:22,471 INFO L93 Difference]: Finished difference Result 207 states and 222 transitions. [2021-11-20 23:39:22,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-20 23:39:22,471 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.0681818181818183) internal successors, (91), 43 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-20 23:39:22,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:22,472 INFO L225 Difference]: With dead ends: 207 [2021-11-20 23:39:22,472 INFO L226 Difference]: Without dead ends: 174 [2021-11-20 23:39:22,474 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2485 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1100, Invalid=6210, Unknown=0, NotChecked=0, Total=7310 [2021-11-20 23:39:22,474 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 34 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:22,475 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 200 Invalid, 391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 338 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:39:22,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-11-20 23:39:22,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 55. [2021-11-20 23:39:22,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:22,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2021-11-20 23:39:22,542 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2021-11-20 23:39:22,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:22,542 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2021-11-20 23:39:22,542 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.0681818181818183) internal successors, (91), 43 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:22,542 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2021-11-20 23:39:22,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-20 23:39:22,543 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:22,543 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 6, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:22,569 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-20 23:39:22,750 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-11-20 23:39:22,750 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:22,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:22,750 INFO L85 PathProgramCache]: Analyzing trace with hash -750611406, now seen corresponding path program 31 times [2021-11-20 23:39:22,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:22,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [753525914] [2021-11-20 23:39:22,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:22,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:22,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:22,935 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 101 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:22,935 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:22,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [753525914] [2021-11-20 23:39:22,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [753525914] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:22,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [650307311] [2021-11-20 23:39:22,935 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:39:22,935 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:22,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:22,936 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:22,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-20 23:39:22,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:22,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:39:22,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:23,459 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 126 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:23,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:23,578 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 126 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:23,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [650307311] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:23,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1850325375] [2021-11-20 23:39:23,579 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:23,579 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:23,579 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:23,580 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:23,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:24,438 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:24,757 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:24,757 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:24,757 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2021-11-20 23:39:24,757 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303353290] [2021-11-20 23:39:24,757 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:24,758 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-20 23:39:24,758 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:24,758 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-20 23:39:24,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=2192, Unknown=0, NotChecked=0, Total=2550 [2021-11-20 23:39:24,759 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 43 states, 43 states have (on average 2.0930232558139537) internal successors, (90), 42 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:25,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:25,689 INFO L93 Difference]: Finished difference Result 245 states and 261 transitions. [2021-11-20 23:39:25,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-20 23:39:25,690 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.0930232558139537) internal successors, (90), 42 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-20 23:39:25,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:25,691 INFO L225 Difference]: With dead ends: 245 [2021-11-20 23:39:25,691 INFO L226 Difference]: Without dead ends: 212 [2021-11-20 23:39:25,691 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2649 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1178, Invalid=6654, Unknown=0, NotChecked=0, Total=7832 [2021-11-20 23:39:25,691 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 73 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 356 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 418 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:25,692 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 199 Invalid, 418 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 356 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:39:25,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-11-20 23:39:25,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 55. [2021-11-20 23:39:25,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:25,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2021-11-20 23:39:25,736 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2021-11-20 23:39:25,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:25,736 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2021-11-20 23:39:25,736 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.0930232558139537) internal successors, (90), 42 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:25,736 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2021-11-20 23:39:25,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-20 23:39:25,736 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:25,736 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 5, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:25,758 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Ended with exit code 0 [2021-11-20 23:39:25,937 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-11-20 23:39:25,937 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:25,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:25,937 INFO L85 PathProgramCache]: Analyzing trace with hash -552815807, now seen corresponding path program 32 times [2021-11-20 23:39:25,937 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:25,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394013944] [2021-11-20 23:39:25,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:25,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:25,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:26,170 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 101 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:26,171 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:26,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394013944] [2021-11-20 23:39:26,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [394013944] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:26,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [303506395] [2021-11-20 23:39:26,171 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:39:26,171 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:26,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:26,172 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:26,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-20 23:39:26,231 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-20 23:39:26,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:39:26,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:39:26,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:26,711 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 126 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:26,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:26,848 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 126 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:26,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [303506395] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:26,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1280237199] [2021-11-20 23:39:26,849 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:26,850 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:26,850 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:26,850 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:26,850 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:27,892 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:28,256 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:28,257 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:28,257 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 41 [2021-11-20 23:39:28,257 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068827675] [2021-11-20 23:39:28,257 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:28,257 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-20 23:39:28,257 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:28,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-20 23:39:28,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=342, Invalid=2108, Unknown=0, NotChecked=0, Total=2450 [2021-11-20 23:39:28,258 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 42 states, 42 states have (on average 2.119047619047619) internal successors, (89), 41 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:29,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:29,253 INFO L93 Difference]: Finished difference Result 282 states and 299 transitions. [2021-11-20 23:39:29,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-20 23:39:29,253 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.119047619047619) internal successors, (89), 41 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-20 23:39:29,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:29,257 INFO L225 Difference]: With dead ends: 282 [2021-11-20 23:39:29,257 INFO L226 Difference]: Without dead ends: 249 [2021-11-20 23:39:29,257 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2691 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1205, Invalid=6805, Unknown=0, NotChecked=0, Total=8010 [2021-11-20 23:39:29,258 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 91 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:29,258 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 141 Invalid, 307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:39:29,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2021-11-20 23:39:29,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 55. [2021-11-20 23:39:29,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:29,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2021-11-20 23:39:29,335 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2021-11-20 23:39:29,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:29,335 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2021-11-20 23:39:29,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.119047619047619) internal successors, (89), 41 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:29,336 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2021-11-20 23:39:29,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-20 23:39:29,336 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:29,336 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 5, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:29,359 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Ended with exit code 0 [2021-11-20 23:39:29,536 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:29,537 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:29,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:29,537 INFO L85 PathProgramCache]: Analyzing trace with hash 1393227346, now seen corresponding path program 33 times [2021-11-20 23:39:29,537 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:29,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2127701058] [2021-11-20 23:39:29,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:29,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:29,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:29,792 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 101 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:29,793 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:29,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2127701058] [2021-11-20 23:39:29,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2127701058] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:29,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [111776891] [2021-11-20 23:39:29,793 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:39:29,793 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:29,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:29,794 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:29,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-20 23:39:29,853 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:39:29,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:39:29,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:39:29,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:30,339 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 126 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:30,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:30,447 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 126 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:30,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [111776891] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:30,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1305170402] [2021-11-20 23:39:30,448 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:30,448 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:30,448 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:30,448 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:30,448 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:31,308 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:31,634 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:31,635 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:31,635 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 40 [2021-11-20 23:39:31,635 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4105803] [2021-11-20 23:39:31,635 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:31,635 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-20 23:39:31,635 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:31,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-20 23:39:31,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=330, Invalid=2022, Unknown=0, NotChecked=0, Total=2352 [2021-11-20 23:39:31,636 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 41 states, 41 states have (on average 2.1463414634146343) internal successors, (88), 40 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:32,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:32,558 INFO L93 Difference]: Finished difference Result 318 states and 336 transitions. [2021-11-20 23:39:32,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-20 23:39:32,559 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.1463414634146343) internal successors, (88), 40 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-20 23:39:32,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:32,560 INFO L225 Difference]: With dead ends: 318 [2021-11-20 23:39:32,560 INFO L226 Difference]: Without dead ends: 285 [2021-11-20 23:39:32,561 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2602 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1178, Invalid=6654, Unknown=0, NotChecked=0, Total=7832 [2021-11-20 23:39:32,561 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 118 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 322 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:32,561 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [118 Valid, 147 Invalid, 322 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:39:32,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2021-11-20 23:39:32,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 55. [2021-11-20 23:39:32,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:32,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2021-11-20 23:39:32,611 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2021-11-20 23:39:32,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:32,611 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2021-11-20 23:39:32,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.1463414634146343) internal successors, (88), 40 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:32,611 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2021-11-20 23:39:32,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-20 23:39:32,612 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:32,612 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 6, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:32,632 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2021-11-20 23:39:32,814 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-20 23:39:32,814 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:32,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:32,814 INFO L85 PathProgramCache]: Analyzing trace with hash -1314943711, now seen corresponding path program 34 times [2021-11-20 23:39:32,814 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:32,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1189137766] [2021-11-20 23:39:32,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:32,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:32,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:33,024 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 101 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:33,024 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:33,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1189137766] [2021-11-20 23:39:33,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1189137766] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:33,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1639421160] [2021-11-20 23:39:33,025 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:39:33,025 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:33,025 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:33,025 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:33,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-20 23:39:33,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:33,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:39:33,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:33,497 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 126 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:33,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:33,616 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 126 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:33,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1639421160] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:33,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [573040660] [2021-11-20 23:39:33,618 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:33,619 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:33,619 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:33,619 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:33,619 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:34,592 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:34,937 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:34,937 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:34,937 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 39 [2021-11-20 23:39:34,937 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653322719] [2021-11-20 23:39:34,937 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:34,938 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-20 23:39:34,938 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:34,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-20 23:39:34,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=322, Invalid=1934, Unknown=0, NotChecked=0, Total=2256 [2021-11-20 23:39:34,938 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 40 states, 40 states have (on average 2.175) internal successors, (87), 39 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:35,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:35,927 INFO L93 Difference]: Finished difference Result 353 states and 372 transitions. [2021-11-20 23:39:35,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-20 23:39:35,927 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.175) internal successors, (87), 39 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-20 23:39:35,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:35,928 INFO L225 Difference]: With dead ends: 353 [2021-11-20 23:39:35,928 INFO L226 Difference]: Without dead ends: 320 [2021-11-20 23:39:35,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2385 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1100, Invalid=6210, Unknown=0, NotChecked=0, Total=7310 [2021-11-20 23:39:35,929 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 147 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:35,929 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [147 Valid, 167 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:39:35,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2021-11-20 23:39:35,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 55. [2021-11-20 23:39:35,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:35,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2021-11-20 23:39:35,980 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2021-11-20 23:39:35,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:35,980 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2021-11-20 23:39:35,980 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.175) internal successors, (87), 39 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:35,981 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2021-11-20 23:39:35,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-20 23:39:35,981 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:35,981 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:36,003 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2021-11-20 23:39:36,181 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:36,182 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:36,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:36,182 INFO L85 PathProgramCache]: Analyzing trace with hash 398811250, now seen corresponding path program 35 times [2021-11-20 23:39:36,182 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:36,182 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778954177] [2021-11-20 23:39:36,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:36,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:36,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:36,408 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 101 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:36,409 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:36,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1778954177] [2021-11-20 23:39:36,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1778954177] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:36,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1759666636] [2021-11-20 23:39:36,409 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:39:36,410 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:36,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:36,434 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:36,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-20 23:39:36,475 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-20 23:39:36,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:39:36,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:39:36,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:36,940 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 126 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:36,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:37,051 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 126 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:37,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1759666636] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:37,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [494259811] [2021-11-20 23:39:37,052 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:37,052 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:37,052 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:37,052 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:37,053 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:37,961 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:38,274 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:38,274 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:38,274 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 38 [2021-11-20 23:39:38,275 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256574496] [2021-11-20 23:39:38,275 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:38,275 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-20 23:39:38,275 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:38,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-20 23:39:38,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=1844, Unknown=0, NotChecked=0, Total=2162 [2021-11-20 23:39:38,276 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 38 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:39,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:39,189 INFO L93 Difference]: Finished difference Result 387 states and 407 transitions. [2021-11-20 23:39:39,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-20 23:39:39,189 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 38 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-20 23:39:39,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:39,193 INFO L225 Difference]: With dead ends: 387 [2021-11-20 23:39:39,193 INFO L226 Difference]: Without dead ends: 354 [2021-11-20 23:39:39,194 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2055 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=980, Invalid=5500, Unknown=0, NotChecked=0, Total=6480 [2021-11-20 23:39:39,194 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 171 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 294 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 379 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:39,194 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 184 Invalid, 379 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 294 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:39:39,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2021-11-20 23:39:39,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 55. [2021-11-20 23:39:39,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:39,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2021-11-20 23:39:39,274 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2021-11-20 23:39:39,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:39,274 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2021-11-20 23:39:39,276 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 38 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:39,276 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2021-11-20 23:39:39,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-20 23:39:39,276 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:39,277 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:39,315 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2021-11-20 23:39:39,491 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:39,491 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:39,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:39,492 INFO L85 PathProgramCache]: Analyzing trace with hash 1423924993, now seen corresponding path program 36 times [2021-11-20 23:39:39,492 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:39,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811424187] [2021-11-20 23:39:39,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:39,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:39,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:39,721 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 101 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:39,722 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:39,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811424187] [2021-11-20 23:39:39,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811424187] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:39,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [745741082] [2021-11-20 23:39:39,722 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:39:39,722 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:39,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:39,730 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:39,746 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-20 23:39:39,783 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:39:39,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:39:39,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:39:39,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:40,208 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 126 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:40,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:40,322 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 126 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:40,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [745741082] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:40,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1532725129] [2021-11-20 23:39:40,323 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:40,323 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:40,323 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:40,323 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:40,323 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:41,245 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:41,574 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:41,575 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:41,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 37 [2021-11-20 23:39:41,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750676572] [2021-11-20 23:39:41,575 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:41,575 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-20 23:39:41,575 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:41,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-20 23:39:41,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=1752, Unknown=0, NotChecked=0, Total=2070 [2021-11-20 23:39:41,576 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 38 states, 38 states have (on average 2.236842105263158) internal successors, (85), 37 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:42,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:42,470 INFO L93 Difference]: Finished difference Result 420 states and 441 transitions. [2021-11-20 23:39:42,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-20 23:39:42,470 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.236842105263158) internal successors, (85), 37 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-20 23:39:42,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:42,472 INFO L225 Difference]: With dead ends: 420 [2021-11-20 23:39:42,472 INFO L226 Difference]: Without dead ends: 387 [2021-11-20 23:39:42,473 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1619 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=833, Invalid=4569, Unknown=0, NotChecked=0, Total=5402 [2021-11-20 23:39:42,473 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 159 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:42,473 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 163 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:39:42,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2021-11-20 23:39:42,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 55. [2021-11-20 23:39:42,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:42,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2021-11-20 23:39:42,532 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2021-11-20 23:39:42,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:42,532 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2021-11-20 23:39:42,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.236842105263158) internal successors, (85), 37 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:42,532 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2021-11-20 23:39:42,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-20 23:39:42,532 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:42,532 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:42,554 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2021-11-20 23:39:42,733 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable62 [2021-11-20 23:39:42,733 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:42,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:42,733 INFO L85 PathProgramCache]: Analyzing trace with hash 1179898514, now seen corresponding path program 9 times [2021-11-20 23:39:42,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:42,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [38004162] [2021-11-20 23:39:42,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:42,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:42,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:42,970 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 101 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:42,970 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:42,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [38004162] [2021-11-20 23:39:42,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [38004162] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:42,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1143007684] [2021-11-20 23:39:42,970 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:39:42,970 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:42,971 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:42,972 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:42,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-20 23:39:43,017 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:39:43,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:39:43,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:39:43,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:43,426 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:43,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:43,541 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:43,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1143007684] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:43,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1509422132] [2021-11-20 23:39:43,542 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:43,542 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:43,542 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:43,543 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:43,543 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:44,427 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:44,818 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:44,818 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:44,819 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 36 [2021-11-20 23:39:44,819 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331915181] [2021-11-20 23:39:44,819 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:44,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-20 23:39:44,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:44,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-20 23:39:44,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=1659, Unknown=0, NotChecked=0, Total=1980 [2021-11-20 23:39:44,820 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 37 states, 37 states have (on average 2.2432432432432434) internal successors, (83), 36 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:45,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:45,567 INFO L93 Difference]: Finished difference Result 454 states and 477 transitions. [2021-11-20 23:39:45,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-20 23:39:45,567 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.2432432432432434) internal successors, (83), 36 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-20 23:39:45,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:45,569 INFO L225 Difference]: With dead ends: 454 [2021-11-20 23:39:45,569 INFO L226 Difference]: Without dead ends: 421 [2021-11-20 23:39:45,569 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1165 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=689, Invalid=3471, Unknown=0, NotChecked=0, Total=4160 [2021-11-20 23:39:45,570 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 187 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 187 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:45,570 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [187 Valid, 145 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 232 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:39:45,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2021-11-20 23:39:45,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 56. [2021-11-20 23:39:45,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.2363636363636363) internal successors, (68), 55 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:45,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 68 transitions. [2021-11-20 23:39:45,623 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 68 transitions. Word has length 44 [2021-11-20 23:39:45,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:45,624 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 68 transitions. [2021-11-20 23:39:45,624 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.2432432432432434) internal successors, (83), 36 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:45,624 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 68 transitions. [2021-11-20 23:39:45,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-20 23:39:45,625 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:45,625 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:45,645 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2021-11-20 23:39:45,826 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:45,826 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:45,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:45,826 INFO L85 PathProgramCache]: Analyzing trace with hash 2126112005, now seen corresponding path program 18 times [2021-11-20 23:39:45,826 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:45,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766582509] [2021-11-20 23:39:45,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:45,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:45,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:45,924 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 55 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:45,924 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:45,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766582509] [2021-11-20 23:39:45,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766582509] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:45,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1708459806] [2021-11-20 23:39:45,925 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:39:45,925 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:45,925 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:45,926 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:45,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-20 23:39:45,969 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:39:45,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:39:45,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-20 23:39:45,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:46,081 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 55 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:46,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:46,186 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 55 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:46,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1708459806] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:46,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1222820831] [2021-11-20 23:39:46,188 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:46,188 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:46,188 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:46,188 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:46,189 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:47,175 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:47,462 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:47,462 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:47,462 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 14 [2021-11-20 23:39:47,462 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521469038] [2021-11-20 23:39:47,462 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:47,463 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-20 23:39:47,463 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:47,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-20 23:39:47,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=390, Unknown=0, NotChecked=0, Total=506 [2021-11-20 23:39:47,463 INFO L87 Difference]: Start difference. First operand 56 states and 68 transitions. Second operand has 15 states, 15 states have (on average 3.1333333333333333) internal successors, (47), 14 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:47,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:47,734 INFO L93 Difference]: Finished difference Result 67 states and 79 transitions. [2021-11-20 23:39:47,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-20 23:39:47,735 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.1333333333333333) internal successors, (47), 14 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-20 23:39:47,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:47,735 INFO L225 Difference]: With dead ends: 67 [2021-11-20 23:39:47,735 INFO L226 Difference]: Without dead ends: 65 [2021-11-20 23:39:47,735 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=299, Invalid=891, Unknown=0, NotChecked=0, Total=1190 [2021-11-20 23:39:47,736 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 38 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:47,736 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 26 Invalid, 238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 194 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:39:47,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-20 23:39:47,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 59. [2021-11-20 23:39:47,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.2241379310344827) internal successors, (71), 58 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:47,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 71 transitions. [2021-11-20 23:39:47,794 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 71 transitions. Word has length 45 [2021-11-20 23:39:47,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:47,794 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 71 transitions. [2021-11-20 23:39:47,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.1333333333333333) internal successors, (47), 14 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:47,794 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 71 transitions. [2021-11-20 23:39:47,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-20 23:39:47,794 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:47,795 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:47,816 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Ended with exit code 0 [2021-11-20 23:39:47,998 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:47,998 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:47,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:47,998 INFO L85 PathProgramCache]: Analyzing trace with hash 1124869963, now seen corresponding path program 19 times [2021-11-20 23:39:47,998 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:47,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055722223] [2021-11-20 23:39:47,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:47,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:48,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:48,231 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 127 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:48,231 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:48,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055722223] [2021-11-20 23:39:48,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055722223] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:48,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1404875406] [2021-11-20 23:39:48,232 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:39:48,232 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:48,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:48,232 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:48,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-20 23:39:48,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:48,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:39:48,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:48,893 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:48,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:49,020 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:49,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1404875406] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:49,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2069715757] [2021-11-20 23:39:49,021 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:49,021 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:49,021 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:49,021 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:49,022 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:50,012 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:50,434 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:50,435 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:50,435 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 49 [2021-11-20 23:39:50,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160862154] [2021-11-20 23:39:50,435 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:50,435 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-20 23:39:50,435 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:50,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-20 23:39:50,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=514, Invalid=2792, Unknown=0, NotChecked=0, Total=3306 [2021-11-20 23:39:50,436 INFO L87 Difference]: Start difference. First operand 59 states and 71 transitions. Second operand has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:51,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:51,039 INFO L93 Difference]: Finished difference Result 140 states and 154 transitions. [2021-11-20 23:39:51,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-20 23:39:51,040 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-20 23:39:51,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:51,040 INFO L225 Difference]: With dead ends: 140 [2021-11-20 23:39:51,040 INFO L226 Difference]: Without dead ends: 104 [2021-11-20 23:39:51,041 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2187 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1001, Invalid=5319, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 23:39:51,041 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 21 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:51,041 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 163 Invalid, 326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:39:51,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-20 23:39:51,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 60. [2021-11-20 23:39:51,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:51,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2021-11-20 23:39:51,107 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2021-11-20 23:39:51,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:51,107 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2021-11-20 23:39:51,107 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:51,107 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2021-11-20 23:39:51,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-20 23:39:51,107 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:51,107 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:51,129 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Ended with exit code 0 [2021-11-20 23:39:51,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:51,308 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:51,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:51,308 INFO L85 PathProgramCache]: Analyzing trace with hash -1700607652, now seen corresponding path program 37 times [2021-11-20 23:39:51,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:51,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918503940] [2021-11-20 23:39:51,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:51,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:51,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:51,591 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 127 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:51,591 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:51,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918503940] [2021-11-20 23:39:51,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1918503940] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:51,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1655734307] [2021-11-20 23:39:51,592 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:39:51,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:51,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:51,593 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:51,598 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-20 23:39:51,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:51,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:39:51,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:52,253 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 155 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:52,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:52,384 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 155 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:52,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1655734307] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:52,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [919085707] [2021-11-20 23:39:52,385 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:52,385 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:52,386 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:52,386 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:52,386 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:53,242 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:53,596 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:53,596 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:53,596 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2021-11-20 23:39:53,596 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409703948] [2021-11-20 23:39:53,596 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:53,597 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-20 23:39:53,597 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:53,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-20 23:39:53,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=2721, Unknown=0, NotChecked=0, Total=3192 [2021-11-20 23:39:53,597 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 49 states, 49 states have (on average 2.0408163265306123) internal successors, (100), 48 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:54,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:54,419 INFO L93 Difference]: Finished difference Result 184 states and 199 transitions. [2021-11-20 23:39:54,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-20 23:39:54,419 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0408163265306123) internal successors, (100), 48 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-20 23:39:54,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:54,420 INFO L225 Difference]: With dead ends: 184 [2021-11-20 23:39:54,420 INFO L226 Difference]: Without dead ends: 148 [2021-11-20 23:39:54,420 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2636 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1162, Invalid=6494, Unknown=0, NotChecked=0, Total=7656 [2021-11-20 23:39:54,421 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 39 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 311 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 365 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:54,421 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 172 Invalid, 365 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 311 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:39:54,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-20 23:39:54,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 60. [2021-11-20 23:39:54,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:54,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2021-11-20 23:39:54,489 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2021-11-20 23:39:54,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:54,489 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2021-11-20 23:39:54,489 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.0408163265306123) internal successors, (100), 48 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:54,489 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2021-11-20 23:39:54,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-20 23:39:54,489 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:54,489 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:54,513 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Ended with exit code 0 [2021-11-20 23:39:54,690 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:54,690 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:54,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:54,691 INFO L85 PathProgramCache]: Analyzing trace with hash 563552555, now seen corresponding path program 38 times [2021-11-20 23:39:54,691 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:54,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344209254] [2021-11-20 23:39:54,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:54,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:54,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:54,993 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 127 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:54,993 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:54,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344209254] [2021-11-20 23:39:54,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1344209254] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:54,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1421094787] [2021-11-20 23:39:54,993 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:39:54,994 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:54,994 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:54,994 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:55,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-20 23:39:55,066 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-20 23:39:55,066 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:39:55,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:39:55,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:55,742 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 155 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:55,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:55,893 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 155 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:55,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1421094787] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:55,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1319662072] [2021-11-20 23:39:55,894 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:55,894 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:55,895 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:55,895 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:55,895 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:56,882 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:57,259 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:57,259 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:57,259 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2021-11-20 23:39:57,259 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528226356] [2021-11-20 23:39:57,259 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:57,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-20 23:39:57,260 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:57,260 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-20 23:39:57,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=2636, Unknown=0, NotChecked=0, Total=3080 [2021-11-20 23:39:57,260 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 48 states, 48 states have (on average 2.0625) internal successors, (99), 47 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:58,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:58,275 INFO L93 Difference]: Finished difference Result 227 states and 243 transitions. [2021-11-20 23:39:58,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-20 23:39:58,275 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.0625) internal successors, (99), 47 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-20 23:39:58,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:58,276 INFO L225 Difference]: With dead ends: 227 [2021-11-20 23:39:58,276 INFO L226 Difference]: Without dead ends: 191 [2021-11-20 23:39:58,276 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3005 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1321, Invalid=7421, Unknown=0, NotChecked=0, Total=8742 [2021-11-20 23:39:58,277 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 34 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 376 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 418 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:58,277 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 224 Invalid, 418 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 376 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:39:58,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-20 23:39:58,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 60. [2021-11-20 23:39:58,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:58,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2021-11-20 23:39:58,394 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2021-11-20 23:39:58,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:58,394 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2021-11-20 23:39:58,394 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.0625) internal successors, (99), 47 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:58,394 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2021-11-20 23:39:58,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-20 23:39:58,395 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:58,395 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:58,439 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2021-11-20 23:39:58,614 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-11-20 23:39:58,614 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:58,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:58,614 INFO L85 PathProgramCache]: Analyzing trace with hash -471788676, now seen corresponding path program 39 times [2021-11-20 23:39:58,614 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:58,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135728667] [2021-11-20 23:39:58,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:58,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:58,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:58,902 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 127 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:58,903 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:58,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135728667] [2021-11-20 23:39:58,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135728667] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:58,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [422632869] [2021-11-20 23:39:58,903 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:39:58,903 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:58,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:58,905 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:58,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-20 23:39:58,954 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:39:58,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:39:58,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:39:58,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:59,634 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 155 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:59,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:59,760 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 155 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:59,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [422632869] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:59,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [136669316] [2021-11-20 23:39:59,761 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:39:59,761 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:59,761 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:59,761 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:59,761 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:00,615 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:00,952 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:00,953 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:00,953 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2021-11-20 23:40:00,953 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406808699] [2021-11-20 23:40:00,953 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:00,954 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-20 23:40:00,954 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:00,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-20 23:40:00,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=421, Invalid=2549, Unknown=0, NotChecked=0, Total=2970 [2021-11-20 23:40:00,955 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 47 states, 47 states have (on average 2.0851063829787235) internal successors, (98), 46 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:02,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:02,113 INFO L93 Difference]: Finished difference Result 269 states and 286 transitions. [2021-11-20 23:40:02,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-20 23:40:02,114 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.0851063829787235) internal successors, (98), 46 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-20 23:40:02,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:02,115 INFO L225 Difference]: With dead ends: 269 [2021-11-20 23:40:02,115 INFO L226 Difference]: Without dead ends: 233 [2021-11-20 23:40:02,115 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3259 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1437, Invalid=8069, Unknown=0, NotChecked=0, Total=9506 [2021-11-20 23:40:02,116 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 58 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 407 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:02,116 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 189 Invalid, 407 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:40:02,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-11-20 23:40:02,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 60. [2021-11-20 23:40:02,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:02,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2021-11-20 23:40:02,191 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2021-11-20 23:40:02,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:02,191 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2021-11-20 23:40:02,191 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.0851063829787235) internal successors, (98), 46 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:02,191 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2021-11-20 23:40:02,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-20 23:40:02,191 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:02,191 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 6, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:40:02,215 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Ended with exit code 0 [2021-11-20 23:40:02,392 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-11-20 23:40:02,392 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:02,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:02,392 INFO L85 PathProgramCache]: Analyzing trace with hash -1336470773, now seen corresponding path program 40 times [2021-11-20 23:40:02,392 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:02,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1515063425] [2021-11-20 23:40:02,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:02,393 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:02,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:02,690 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 127 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:02,690 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:02,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1515063425] [2021-11-20 23:40:02,690 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1515063425] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:02,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [908636757] [2021-11-20 23:40:02,690 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:40:02,691 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:02,691 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:02,692 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:02,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2021-11-20 23:40:02,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:02,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:40:02,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:03,506 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 155 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:03,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:03,684 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 155 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:03,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [908636757] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:03,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1851294297] [2021-11-20 23:40:03,686 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:40:03,686 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:03,686 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:03,686 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:03,686 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:04,878 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:05,217 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:05,217 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:05,217 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 45 [2021-11-20 23:40:05,218 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921575701] [2021-11-20 23:40:05,218 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:05,218 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-20 23:40:05,218 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:05,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-20 23:40:05,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=402, Invalid=2460, Unknown=0, NotChecked=0, Total=2862 [2021-11-20 23:40:05,219 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 46 states, 46 states have (on average 2.108695652173913) internal successors, (97), 45 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:06,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:06,552 INFO L93 Difference]: Finished difference Result 310 states and 328 transitions. [2021-11-20 23:40:06,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-20 23:40:06,553 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.108695652173913) internal successors, (97), 45 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-20 23:40:06,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:06,554 INFO L225 Difference]: With dead ends: 310 [2021-11-20 23:40:06,554 INFO L226 Difference]: Without dead ends: 274 [2021-11-20 23:40:06,555 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3382 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1498, Invalid=8402, Unknown=0, NotChecked=0, Total=9900 [2021-11-20 23:40:06,555 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 92 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:06,555 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 212 Invalid, 431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 337 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:40:06,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2021-11-20 23:40:06,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 60. [2021-11-20 23:40:06,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:06,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2021-11-20 23:40:06,643 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2021-11-20 23:40:06,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:06,644 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2021-11-20 23:40:06,644 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.108695652173913) internal successors, (97), 45 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:06,644 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2021-11-20 23:40:06,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-20 23:40:06,644 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:06,644 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:40:06,669 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Ended with exit code 0 [2021-11-20 23:40:06,845 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:06,845 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:06,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:06,846 INFO L85 PathProgramCache]: Analyzing trace with hash -1502911076, now seen corresponding path program 41 times [2021-11-20 23:40:06,846 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:06,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250146993] [2021-11-20 23:40:06,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:06,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:06,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:07,161 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 127 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:07,162 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:07,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250146993] [2021-11-20 23:40:07,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1250146993] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:07,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1250425395] [2021-11-20 23:40:07,162 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:40:07,162 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:07,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:07,164 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:07,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-20 23:40:07,225 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-20 23:40:07,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:40:07,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:40:07,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:07,795 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 155 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:07,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:07,922 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 155 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:07,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1250425395] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:07,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1609972913] [2021-11-20 23:40:07,923 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:40:07,923 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:07,924 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:07,924 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:07,924 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:08,824 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:09,153 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:09,153 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:09,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 44 [2021-11-20 23:40:09,154 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275385141] [2021-11-20 23:40:09,154 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:09,154 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-20 23:40:09,154 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:09,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-20 23:40:09,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=387, Invalid=2369, Unknown=0, NotChecked=0, Total=2756 [2021-11-20 23:40:09,155 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 45 states, 45 states have (on average 2.1333333333333333) internal successors, (96), 44 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:10,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:10,499 INFO L93 Difference]: Finished difference Result 350 states and 369 transitions. [2021-11-20 23:40:10,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-20 23:40:10,499 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.1333333333333333) internal successors, (96), 44 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-20 23:40:10,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:10,501 INFO L225 Difference]: With dead ends: 350 [2021-11-20 23:40:10,501 INFO L226 Difference]: Without dead ends: 314 [2021-11-20 23:40:10,502 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3359 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1498, Invalid=8402, Unknown=0, NotChecked=0, Total=9900 [2021-11-20 23:40:10,502 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 108 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 344 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 447 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 344 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:10,502 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 216 Invalid, 447 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 344 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:40:10,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2021-11-20 23:40:10,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 60. [2021-11-20 23:40:10,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:10,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2021-11-20 23:40:10,582 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2021-11-20 23:40:10,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:10,582 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2021-11-20 23:40:10,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.1333333333333333) internal successors, (96), 44 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:10,582 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2021-11-20 23:40:10,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-20 23:40:10,582 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:10,582 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 6, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:40:10,606 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Ended with exit code 0 [2021-11-20 23:40:10,783 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:10,783 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:10,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:10,783 INFO L85 PathProgramCache]: Analyzing trace with hash -399901461, now seen corresponding path program 42 times [2021-11-20 23:40:10,783 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:10,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973197788] [2021-11-20 23:40:10,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:10,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:10,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:11,049 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 127 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:11,049 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:11,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973197788] [2021-11-20 23:40:11,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1973197788] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:11,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [887397592] [2021-11-20 23:40:11,050 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:40:11,050 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:11,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:11,051 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:11,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-20 23:40:11,098 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:40:11,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:40:11,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:40:11,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:11,873 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 155 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:11,873 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:12,014 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 155 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:12,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [887397592] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:12,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1974440714] [2021-11-20 23:40:12,015 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:40:12,015 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:12,015 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:12,015 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:12,016 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:13,060 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:13,393 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:13,393 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:13,393 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 43 [2021-11-20 23:40:13,393 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439134797] [2021-11-20 23:40:13,393 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:13,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-20 23:40:13,393 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:13,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-20 23:40:13,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=2276, Unknown=0, NotChecked=0, Total=2652 [2021-11-20 23:40:13,394 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 44 states, 44 states have (on average 2.159090909090909) internal successors, (95), 43 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:14,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:14,861 INFO L93 Difference]: Finished difference Result 389 states and 409 transitions. [2021-11-20 23:40:14,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-20 23:40:14,861 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.159090909090909) internal successors, (95), 43 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-20 23:40:14,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:14,862 INFO L225 Difference]: With dead ends: 389 [2021-11-20 23:40:14,862 INFO L226 Difference]: Without dead ends: 353 [2021-11-20 23:40:14,863 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3187 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1437, Invalid=8069, Unknown=0, NotChecked=0, Total=9506 [2021-11-20 23:40:14,863 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 173 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 365 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 173 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:14,863 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [173 Valid, 223 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 365 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:40:14,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2021-11-20 23:40:14,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 60. [2021-11-20 23:40:14,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:14,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2021-11-20 23:40:14,950 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2021-11-20 23:40:14,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:14,951 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2021-11-20 23:40:14,951 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.159090909090909) internal successors, (95), 43 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:14,951 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2021-11-20 23:40:14,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-20 23:40:14,951 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:14,951 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:40:14,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Forceful destruction successful, exit code 0 [2021-11-20 23:40:15,151 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:15,152 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:15,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:15,152 INFO L85 PathProgramCache]: Analyzing trace with hash 1436794812, now seen corresponding path program 43 times [2021-11-20 23:40:15,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:15,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755919602] [2021-11-20 23:40:15,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:15,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:15,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:15,450 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 127 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:15,451 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:15,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755919602] [2021-11-20 23:40:15,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [755919602] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:15,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1041154082] [2021-11-20 23:40:15,451 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:40:15,451 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:15,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:15,454 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:15,470 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2021-11-20 23:40:15,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:15,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:40:15,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:16,133 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 155 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:16,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:16,267 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 155 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:16,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1041154082] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:16,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1408795818] [2021-11-20 23:40:16,268 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:40:16,268 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:16,268 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:16,268 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:16,268 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:17,123 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:17,457 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:17,457 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:17,457 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 42 [2021-11-20 23:40:17,457 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952480428] [2021-11-20 23:40:17,458 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:17,458 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-20 23:40:17,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:17,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-20 23:40:17,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=369, Invalid=2181, Unknown=0, NotChecked=0, Total=2550 [2021-11-20 23:40:17,458 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 43 states, 43 states have (on average 2.186046511627907) internal successors, (94), 42 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:18,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:18,852 INFO L93 Difference]: Finished difference Result 427 states and 448 transitions. [2021-11-20 23:40:18,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-20 23:40:18,852 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.186046511627907) internal successors, (94), 42 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-20 23:40:18,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:18,854 INFO L225 Difference]: With dead ends: 427 [2021-11-20 23:40:18,854 INFO L226 Difference]: Without dead ends: 391 [2021-11-20 23:40:18,855 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2875 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1321, Invalid=7421, Unknown=0, NotChecked=0, Total=8742 [2021-11-20 23:40:18,855 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 182 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 434 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:18,855 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [182 Valid, 204 Invalid, 434 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 318 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:40:18,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2021-11-20 23:40:18,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 60. [2021-11-20 23:40:18,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:18,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2021-11-20 23:40:18,946 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2021-11-20 23:40:18,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:18,946 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2021-11-20 23:40:18,946 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.186046511627907) internal successors, (94), 42 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:18,946 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2021-11-20 23:40:18,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-20 23:40:18,947 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:18,947 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:40:18,970 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Ended with exit code 0 [2021-11-20 23:40:19,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:19,147 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:19,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:19,148 INFO L85 PathProgramCache]: Analyzing trace with hash 1634590411, now seen corresponding path program 44 times [2021-11-20 23:40:19,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:19,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263926996] [2021-11-20 23:40:19,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:19,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:19,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:19,390 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 127 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:19,390 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:19,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263926996] [2021-11-20 23:40:19,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1263926996] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:19,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1253967135] [2021-11-20 23:40:19,390 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:40:19,390 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:19,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:19,391 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:19,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-20 23:40:19,438 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-20 23:40:19,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:40:19,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:40:19,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:19,974 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 155 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:19,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:20,103 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 155 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:20,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1253967135] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:20,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1942975286] [2021-11-20 23:40:20,104 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:40:20,104 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:20,104 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:20,104 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:20,105 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:21,061 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:21,385 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:21,385 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:21,385 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 41 [2021-11-20 23:40:21,385 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071865458] [2021-11-20 23:40:21,385 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:21,385 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-20 23:40:21,385 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:21,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-20 23:40:21,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=2084, Unknown=0, NotChecked=0, Total=2450 [2021-11-20 23:40:21,386 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 42 states, 42 states have (on average 2.2142857142857144) internal successors, (93), 41 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:22,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:22,595 INFO L93 Difference]: Finished difference Result 464 states and 486 transitions. [2021-11-20 23:40:22,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-20 23:40:22,595 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.2142857142857144) internal successors, (93), 41 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-20 23:40:22,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:22,596 INFO L225 Difference]: With dead ends: 464 [2021-11-20 23:40:22,597 INFO L226 Difference]: Without dead ends: 428 [2021-11-20 23:40:22,597 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2444 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1162, Invalid=6494, Unknown=0, NotChecked=0, Total=7656 [2021-11-20 23:40:22,597 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 140 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:22,597 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [140 Valid, 214 Invalid, 391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:40:22,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 428 states. [2021-11-20 23:40:22,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 428 to 60. [2021-11-20 23:40:22,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:22,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2021-11-20 23:40:22,674 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2021-11-20 23:40:22,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:22,674 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2021-11-20 23:40:22,674 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.2142857142857144) internal successors, (93), 41 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:22,674 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2021-11-20 23:40:22,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-20 23:40:22,674 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:22,674 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:40:22,695 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Forceful destruction successful, exit code 0 [2021-11-20 23:40:22,875 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable73 [2021-11-20 23:40:22,875 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:22,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:22,875 INFO L85 PathProgramCache]: Analyzing trace with hash -714333732, now seen corresponding path program 45 times [2021-11-20 23:40:22,875 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:22,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [238719428] [2021-11-20 23:40:22,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:22,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:22,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:23,096 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 127 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:23,096 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:23,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [238719428] [2021-11-20 23:40:23,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [238719428] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:23,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1688926250] [2021-11-20 23:40:23,097 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:40:23,097 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:23,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:23,097 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:23,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2021-11-20 23:40:23,140 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:40:23,140 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:40:23,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:40:23,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:23,588 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 155 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:23,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:23,704 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 155 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:23,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1688926250] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:23,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1555662759] [2021-11-20 23:40:23,705 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:40:23,705 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:23,705 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:23,706 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:23,706 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:24,628 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:24,987 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:24,987 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:24,987 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 40 [2021-11-20 23:40:24,988 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139647283] [2021-11-20 23:40:24,988 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:24,988 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-20 23:40:24,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:24,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-20 23:40:24,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=367, Invalid=1985, Unknown=0, NotChecked=0, Total=2352 [2021-11-20 23:40:24,988 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 41 states, 41 states have (on average 2.2439024390243905) internal successors, (92), 40 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:26,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:26,245 INFO L93 Difference]: Finished difference Result 500 states and 523 transitions. [2021-11-20 23:40:26,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-20 23:40:26,246 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.2439024390243905) internal successors, (92), 40 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-20 23:40:26,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:26,248 INFO L225 Difference]: With dead ends: 500 [2021-11-20 23:40:26,248 INFO L226 Difference]: Without dead ends: 464 [2021-11-20 23:40:26,248 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1905 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=978, Invalid=5342, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 23:40:26,249 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 153 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:26,249 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [153 Valid, 180 Invalid, 326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:40:26,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 464 states. [2021-11-20 23:40:26,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 464 to 60. [2021-11-20 23:40:26,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:26,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2021-11-20 23:40:26,335 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2021-11-20 23:40:26,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:26,335 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2021-11-20 23:40:26,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.2439024390243905) internal successors, (92), 40 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:26,335 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2021-11-20 23:40:26,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-20 23:40:26,336 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:26,336 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:40:26,359 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Ended with exit code 0 [2021-11-20 23:40:26,536 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:26,536 INFO L402 AbstractCegarLoop]: === Iteration 76 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:26,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:26,537 INFO L85 PathProgramCache]: Analyzing trace with hash 872462507, now seen corresponding path program 10 times [2021-11-20 23:40:26,537 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:26,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224429422] [2021-11-20 23:40:26,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:26,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:26,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:26,783 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 127 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:26,783 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:26,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224429422] [2021-11-20 23:40:26,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [224429422] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:26,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [414219930] [2021-11-20 23:40:26,783 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:40:26,783 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:26,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:26,784 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:26,785 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2021-11-20 23:40:26,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:26,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:40:26,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:27,341 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:27,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:27,485 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:27,486 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [414219930] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:27,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [399065595] [2021-11-20 23:40:27,487 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:40:27,487 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:27,487 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:27,487 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:27,487 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:28,435 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:28,795 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:28,795 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:28,796 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 39 [2021-11-20 23:40:28,796 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859081114] [2021-11-20 23:40:28,796 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:28,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-20 23:40:28,796 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:28,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-20 23:40:28,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=1885, Unknown=0, NotChecked=0, Total=2256 [2021-11-20 23:40:28,796 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 40 states, 40 states have (on average 2.25) internal successors, (90), 39 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:29,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:29,846 INFO L93 Difference]: Finished difference Result 537 states and 562 transitions. [2021-11-20 23:40:29,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-20 23:40:29,847 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.25) internal successors, (90), 39 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-20 23:40:29,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:29,848 INFO L225 Difference]: With dead ends: 537 [2021-11-20 23:40:29,848 INFO L226 Difference]: Without dead ends: 501 [2021-11-20 23:40:29,849 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1358 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=803, Invalid=4027, Unknown=0, NotChecked=0, Total=4830 [2021-11-20 23:40:29,849 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 203 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:29,849 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [203 Valid, 143 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:40:29,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2021-11-20 23:40:29,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 61. [2021-11-20 23:40:29,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.2333333333333334) internal successors, (74), 60 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:29,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 74 transitions. [2021-11-20 23:40:29,944 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 74 transitions. Word has length 48 [2021-11-20 23:40:29,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:29,944 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 74 transitions. [2021-11-20 23:40:29,944 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.25) internal successors, (90), 39 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:29,944 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 74 transitions. [2021-11-20 23:40:29,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-20 23:40:29,945 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:29,945 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:40:29,966 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Ended with exit code 0 [2021-11-20 23:40:30,145 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:30,145 INFO L402 AbstractCegarLoop]: === Iteration 77 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:30,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:30,146 INFO L85 PathProgramCache]: Analyzing trace with hash 1858978511, now seen corresponding path program 20 times [2021-11-20 23:40:30,146 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:30,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2083534372] [2021-11-20 23:40:30,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:30,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:30,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:30,261 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 66 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:30,262 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:30,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2083534372] [2021-11-20 23:40:30,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2083534372] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:30,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2130379707] [2021-11-20 23:40:30,262 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:40:30,262 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:30,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:30,263 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:30,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-20 23:40:30,308 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-20 23:40:30,308 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:40:30,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-20 23:40:30,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:30,400 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 66 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:30,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:30,493 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 66 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:30,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2130379707] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:30,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [16681813] [2021-11-20 23:40:30,494 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:40:30,494 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:30,494 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:30,495 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:30,495 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:31,477 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:31,807 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:31,808 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:31,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 15 [2021-11-20 23:40:31,808 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155720085] [2021-11-20 23:40:31,808 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:31,808 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-20 23:40:31,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:31,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-20 23:40:31,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=423, Unknown=0, NotChecked=0, Total=552 [2021-11-20 23:40:31,809 INFO L87 Difference]: Start difference. First operand 61 states and 74 transitions. Second operand has 16 states, 16 states have (on average 3.1875) internal successors, (51), 15 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:32,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:32,163 INFO L93 Difference]: Finished difference Result 72 states and 85 transitions. [2021-11-20 23:40:32,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-20 23:40:32,163 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.1875) internal successors, (51), 15 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-20 23:40:32,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:32,164 INFO L225 Difference]: With dead ends: 72 [2021-11-20 23:40:32,164 INFO L226 Difference]: Without dead ends: 70 [2021-11-20 23:40:32,164 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 145 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 341 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=340, Invalid=992, Unknown=0, NotChecked=0, Total=1332 [2021-11-20 23:40:32,164 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 53 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 170 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:32,165 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 19 Invalid, 229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 170 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:40:32,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-20 23:40:32,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 64. [2021-11-20 23:40:32,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.2222222222222223) internal successors, (77), 63 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:32,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 77 transitions. [2021-11-20 23:40:32,295 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 77 transitions. Word has length 49 [2021-11-20 23:40:32,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:32,295 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 77 transitions. [2021-11-20 23:40:32,296 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.1875) internal successors, (51), 15 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:32,296 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 77 transitions. [2021-11-20 23:40:32,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-20 23:40:32,296 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:32,296 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:40:32,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Forceful destruction successful, exit code 0 [2021-11-20 23:40:32,496 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:32,497 INFO L402 AbstractCegarLoop]: === Iteration 78 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:32,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:32,497 INFO L85 PathProgramCache]: Analyzing trace with hash 1525349697, now seen corresponding path program 21 times [2021-11-20 23:40:32,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:32,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1958507895] [2021-11-20 23:40:32,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:32,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:32,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:32,799 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 156 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:32,800 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:32,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1958507895] [2021-11-20 23:40:32,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1958507895] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:32,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [928117835] [2021-11-20 23:40:32,800 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:40:32,800 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:32,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:32,801 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:32,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2021-11-20 23:40:32,852 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:40:32,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:40:32,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-20 23:40:32,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:33,736 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:33,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:33,895 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:33,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [928117835] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:33,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1381950865] [2021-11-20 23:40:33,896 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:40:33,896 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:33,896 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:33,896 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:33,896 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:34,751 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:35,171 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:35,171 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:35,171 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 53 [2021-11-20 23:40:35,171 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101909095] [2021-11-20 23:40:35,171 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:35,171 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-20 23:40:35,171 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:35,172 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-20 23:40:35,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=592, Invalid=3190, Unknown=0, NotChecked=0, Total=3782 [2021-11-20 23:40:35,172 INFO L87 Difference]: Start difference. First operand 64 states and 77 transitions. Second operand has 54 states, 54 states have (on average 2.0) internal successors, (108), 53 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:35,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:35,887 INFO L93 Difference]: Finished difference Result 152 states and 167 transitions. [2021-11-20 23:40:35,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-20 23:40:35,887 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.0) internal successors, (108), 53 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-20 23:40:35,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:35,887 INFO L225 Difference]: With dead ends: 152 [2021-11-20 23:40:35,888 INFO L226 Difference]: Without dead ends: 113 [2021-11-20 23:40:35,888 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2548 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1159, Invalid=6151, Unknown=0, NotChecked=0, Total=7310 [2021-11-20 23:40:35,888 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 27 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:35,888 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 148 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 266 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:40:35,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-20 23:40:35,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 65. [2021-11-20 23:40:35,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:35,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-20 23:40:35,985 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-20 23:40:35,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:35,985 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-20 23:40:35,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.0) internal successors, (108), 53 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:35,985 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-20 23:40:35,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-20 23:40:35,986 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:35,986 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:40:36,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Forceful destruction successful, exit code 0 [2021-11-20 23:40:36,194 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:36,194 INFO L402 AbstractCegarLoop]: === Iteration 79 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:36,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:36,194 INFO L85 PathProgramCache]: Analyzing trace with hash -481284398, now seen corresponding path program 46 times [2021-11-20 23:40:36,195 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:36,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178980985] [2021-11-20 23:40:36,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:36,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:36,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:36,458 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 156 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:36,458 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:36,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178980985] [2021-11-20 23:40:36,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1178980985] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:36,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [11634998] [2021-11-20 23:40:36,458 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:40:36,458 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:36,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:36,459 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:36,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2021-11-20 23:40:36,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:36,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-20 23:40:36,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:37,194 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 187 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:37,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:37,381 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 187 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:37,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [11634998] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:37,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1109190508] [2021-11-20 23:40:37,382 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:40:37,383 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:37,383 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:37,383 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:37,383 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:38,445 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:38,838 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:38,838 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:38,838 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 52 [2021-11-20 23:40:38,838 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598884683] [2021-11-20 23:40:38,838 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:38,839 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-20 23:40:38,839 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:38,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-20 23:40:38,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=546, Invalid=3114, Unknown=0, NotChecked=0, Total=3660 [2021-11-20 23:40:38,839 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 53 states, 53 states have (on average 2.0377358490566038) internal successors, (108), 52 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:39,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:39,903 INFO L93 Difference]: Finished difference Result 200 states and 216 transitions. [2021-11-20 23:40:39,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-20 23:40:39,903 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0377358490566038) internal successors, (108), 52 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-20 23:40:39,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:39,904 INFO L225 Difference]: With dead ends: 200 [2021-11-20 23:40:39,904 INFO L226 Difference]: Without dead ends: 161 [2021-11-20 23:40:39,905 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3099 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1360, Invalid=7570, Unknown=0, NotChecked=0, Total=8930 [2021-11-20 23:40:39,905 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 34 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 355 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 406 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 355 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:39,905 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 203 Invalid, 406 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 355 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:40:39,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-11-20 23:40:40,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 65. [2021-11-20 23:40:40,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:40,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-20 23:40:40,022 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-20 23:40:40,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:40,023 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-20 23:40:40,023 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.0377358490566038) internal successors, (108), 52 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:40,023 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-20 23:40:40,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-20 23:40:40,023 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:40,023 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:40:40,048 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Forceful destruction successful, exit code 0 [2021-11-20 23:40:40,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2021-11-20 23:40:40,224 INFO L402 AbstractCegarLoop]: === Iteration 80 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:40,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:40,224 INFO L85 PathProgramCache]: Analyzing trace with hash -1515845855, now seen corresponding path program 47 times [2021-11-20 23:40:40,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:40,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1661845910] [2021-11-20 23:40:40,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:40,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:40,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:40,543 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 156 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:40,544 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:40,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1661845910] [2021-11-20 23:40:40,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1661845910] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:40,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [325783363] [2021-11-20 23:40:40,544 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:40:40,544 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:40,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:40,545 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:40,546 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2021-11-20 23:40:40,602 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-20 23:40:40,602 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:40:40,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-20 23:40:40,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:41,311 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 187 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:41,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:41,440 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 187 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:41,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [325783363] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:41,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2075372975] [2021-11-20 23:40:41,441 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:40:41,441 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:41,441 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:41,441 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:41,441 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:42,292 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:42,649 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:42,649 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:42,650 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2021-11-20 23:40:42,650 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823880626] [2021-11-20 23:40:42,650 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:42,650 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-20 23:40:42,650 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:42,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-20 23:40:42,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=516, Invalid=3024, Unknown=0, NotChecked=0, Total=3540 [2021-11-20 23:40:42,651 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 52 states, 52 states have (on average 2.0576923076923075) internal successors, (107), 51 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:43,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:43,846 INFO L93 Difference]: Finished difference Result 247 states and 264 transitions. [2021-11-20 23:40:43,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-20 23:40:43,846 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.0576923076923075) internal successors, (107), 51 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-20 23:40:43,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:43,847 INFO L225 Difference]: With dead ends: 247 [2021-11-20 23:40:43,848 INFO L226 Difference]: Without dead ends: 208 [2021-11-20 23:40:43,848 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3574 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1563, Invalid=8739, Unknown=0, NotChecked=0, Total=10302 [2021-11-20 23:40:43,848 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 65 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 370 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 370 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:43,848 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 193 Invalid, 448 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 370 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:40:43,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-11-20 23:40:43,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 65. [2021-11-20 23:40:43,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:43,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-20 23:40:43,964 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-20 23:40:43,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:43,964 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-20 23:40:43,964 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.0576923076923075) internal successors, (107), 51 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:43,964 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-20 23:40:43,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-20 23:40:43,965 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:43,965 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:40:43,988 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Ended with exit code 0 [2021-11-20 23:40:44,170 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:44,170 INFO L402 AbstractCegarLoop]: === Iteration 81 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:44,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:44,170 INFO L85 PathProgramCache]: Analyzing trace with hash 1914464498, now seen corresponding path program 48 times [2021-11-20 23:40:44,170 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:44,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1850057608] [2021-11-20 23:40:44,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:44,171 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:44,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:44,442 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 156 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:44,442 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:44,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1850057608] [2021-11-20 23:40:44,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1850057608] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:44,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [931422482] [2021-11-20 23:40:44,443 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:40:44,443 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:44,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:44,443 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:44,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2021-11-20 23:40:44,490 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:40:44,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:40:44,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-20 23:40:44,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:45,237 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 187 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:45,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:45,393 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 187 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:45,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [931422482] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:45,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [718245868] [2021-11-20 23:40:45,394 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:40:45,395 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:45,395 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:45,395 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:45,395 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:46,503 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:46,918 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:46,918 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:46,918 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2021-11-20 23:40:46,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677536886] [2021-11-20 23:40:46,918 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:46,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-20 23:40:46,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:46,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-20 23:40:46,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=490, Invalid=2932, Unknown=0, NotChecked=0, Total=3422 [2021-11-20 23:40:46,919 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 51 states, 51 states have (on average 2.0784313725490198) internal successors, (106), 50 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:48,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:48,348 INFO L93 Difference]: Finished difference Result 293 states and 311 transitions. [2021-11-20 23:40:48,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-20 23:40:48,349 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.0784313725490198) internal successors, (106), 50 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-20 23:40:48,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:48,350 INFO L225 Difference]: With dead ends: 293 [2021-11-20 23:40:48,350 INFO L226 Difference]: Without dead ends: 254 [2021-11-20 23:40:48,351 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3932 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1723, Invalid=9619, Unknown=0, NotChecked=0, Total=11342 [2021-11-20 23:40:48,351 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 65 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 437 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:48,351 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 202 Invalid, 437 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 358 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:40:48,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2021-11-20 23:40:48,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 65. [2021-11-20 23:40:48,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:48,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-20 23:40:48,464 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-20 23:40:48,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:48,464 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-20 23:40:48,465 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.0784313725490198) internal successors, (106), 50 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:48,465 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-20 23:40:48,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-20 23:40:48,465 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:48,465 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 7, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:40:48,487 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Forceful destruction successful, exit code 0 [2021-11-20 23:40:48,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:48,666 INFO L402 AbstractCegarLoop]: === Iteration 82 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:48,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:48,666 INFO L85 PathProgramCache]: Analyzing trace with hash 224004353, now seen corresponding path program 49 times [2021-11-20 23:40:48,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:48,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846407032] [2021-11-20 23:40:48,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:48,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:48,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:48,994 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 156 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:48,994 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:48,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846407032] [2021-11-20 23:40:48,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846407032] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:48,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1607719368] [2021-11-20 23:40:48,995 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:40:48,995 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:48,995 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:48,998 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:49,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2021-11-20 23:40:49,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:49,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-20 23:40:49,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:49,814 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 187 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:49,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:49,956 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 187 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:49,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1607719368] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:49,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [301032095] [2021-11-20 23:40:49,957 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:40:49,957 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:49,957 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:49,957 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:49,958 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:50,841 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:51,220 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:51,220 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:51,220 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 49 [2021-11-20 23:40:51,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872080770] [2021-11-20 23:40:51,221 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:51,221 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-20 23:40:51,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:51,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-20 23:40:51,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=468, Invalid=2838, Unknown=0, NotChecked=0, Total=3306 [2021-11-20 23:40:51,222 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:52,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:52,828 INFO L93 Difference]: Finished difference Result 338 states and 357 transitions. [2021-11-20 23:40:52,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-20 23:40:52,829 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-20 23:40:52,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:52,831 INFO L225 Difference]: With dead ends: 338 [2021-11-20 23:40:52,831 INFO L226 Difference]: Without dead ends: 299 [2021-11-20 23:40:52,832 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4152 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1825, Invalid=10165, Unknown=0, NotChecked=0, Total=11990 [2021-11-20 23:40:52,833 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 68 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 459 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 539 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 459 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:52,833 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 276 Invalid, 539 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 459 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:40:52,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-11-20 23:40:53,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 65. [2021-11-20 23:40:53,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:53,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-20 23:40:53,021 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-20 23:40:53,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:53,022 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-20 23:40:53,022 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:53,022 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-20 23:40:53,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-20 23:40:53,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:53,022 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:40:53,047 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Ended with exit code 0 [2021-11-20 23:40:53,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:53,223 INFO L402 AbstractCegarLoop]: === Iteration 83 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:53,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:53,223 INFO L85 PathProgramCache]: Analyzing trace with hash 1693494034, now seen corresponding path program 50 times [2021-11-20 23:40:53,223 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:53,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [68044637] [2021-11-20 23:40:53,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:53,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:53,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:53,510 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 156 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:53,510 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:53,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [68044637] [2021-11-20 23:40:53,510 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [68044637] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:53,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1682059666] [2021-11-20 23:40:53,511 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:40:53,511 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:53,511 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:53,511 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:53,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2021-11-20 23:40:53,570 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-20 23:40:53,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:40:53,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-20 23:40:53,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:54,263 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 187 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:54,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:54,404 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 187 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:54,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1682059666] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:54,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [347321387] [2021-11-20 23:40:54,405 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:40:54,405 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:54,405 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:54,406 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:54,406 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:55,498 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:55,882 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:55,882 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:55,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 48 [2021-11-20 23:40:55,882 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503653753] [2021-11-20 23:40:55,882 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:55,882 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-20 23:40:55,882 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:55,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-20 23:40:55,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=450, Invalid=2742, Unknown=0, NotChecked=0, Total=3192 [2021-11-20 23:40:55,883 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 49 states, 49 states have (on average 2.122448979591837) internal successors, (104), 48 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:57,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:57,416 INFO L93 Difference]: Finished difference Result 382 states and 402 transitions. [2021-11-20 23:40:57,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-20 23:40:57,417 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.122448979591837) internal successors, (104), 48 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-20 23:40:57,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:57,419 INFO L225 Difference]: With dead ends: 382 [2021-11-20 23:40:57,419 INFO L226 Difference]: Without dead ends: 343 [2021-11-20 23:40:57,420 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4213 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1860, Invalid=10350, Unknown=0, NotChecked=0, Total=12210 [2021-11-20 23:40:57,420 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 115 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:57,420 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [115 Valid, 163 Invalid, 380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 256 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:40:57,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2021-11-20 23:40:57,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 65. [2021-11-20 23:40:57,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:57,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-20 23:40:57,535 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-20 23:40:57,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:57,535 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-20 23:40:57,535 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.122448979591837) internal successors, (104), 48 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:57,535 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-20 23:40:57,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-20 23:40:57,535 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:57,535 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:40:57,556 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Ended with exit code 0 [2021-11-20 23:40:57,736 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:57,736 INFO L402 AbstractCegarLoop]: === Iteration 84 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:57,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:57,736 INFO L85 PathProgramCache]: Analyzing trace with hash -337313055, now seen corresponding path program 51 times [2021-11-20 23:40:57,736 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:57,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1521344431] [2021-11-20 23:40:57,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:57,737 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:57,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:58,008 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 156 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:58,008 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:58,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1521344431] [2021-11-20 23:40:58,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1521344431] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:58,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1387934346] [2021-11-20 23:40:58,009 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:40:58,009 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:58,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:58,010 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:58,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2021-11-20 23:40:58,054 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:40:58,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:40:58,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-20 23:40:58,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:58,702 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 187 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:58,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:58,845 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 187 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:58,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1387934346] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:58,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [880549258] [2021-11-20 23:40:58,846 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:40:58,846 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:58,846 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:58,846 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:58,847 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:59,883 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:00,287 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:00,287 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:00,288 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 47 [2021-11-20 23:41:00,288 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470883380] [2021-11-20 23:41:00,288 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:00,288 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-20 23:41:00,288 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:00,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-20 23:41:00,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=436, Invalid=2644, Unknown=0, NotChecked=0, Total=3080 [2021-11-20 23:41:00,289 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 48 states, 48 states have (on average 2.1458333333333335) internal successors, (103), 47 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:02,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:02,287 INFO L93 Difference]: Finished difference Result 425 states and 446 transitions. [2021-11-20 23:41:02,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-20 23:41:02,288 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.1458333333333335) internal successors, (103), 47 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-20 23:41:02,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:02,289 INFO L225 Difference]: With dead ends: 425 [2021-11-20 23:41:02,290 INFO L226 Difference]: Without dead ends: 386 [2021-11-20 23:41:02,291 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4106 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1825, Invalid=10165, Unknown=0, NotChecked=0, Total=11990 [2021-11-20 23:41:02,291 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 113 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 351 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:02,292 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 209 Invalid, 453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 351 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:41:02,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2021-11-20 23:41:02,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 65. [2021-11-20 23:41:02,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:02,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-20 23:41:02,455 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-20 23:41:02,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:02,455 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-20 23:41:02,456 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.1458333333333335) internal successors, (103), 47 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:02,456 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-20 23:41:02,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-20 23:41:02,456 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:02,456 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 7, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:41:02,482 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Forceful destruction successful, exit code 0 [2021-11-20 23:41:02,656 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable83 [2021-11-20 23:41:02,657 INFO L402 AbstractCegarLoop]: === Iteration 85 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:41:02,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:02,657 INFO L85 PathProgramCache]: Analyzing trace with hash -1372654286, now seen corresponding path program 52 times [2021-11-20 23:41:02,657 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:02,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428090804] [2021-11-20 23:41:02,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:02,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:02,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:02,941 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 156 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:02,942 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:02,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428090804] [2021-11-20 23:41:02,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1428090804] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:02,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1616001882] [2021-11-20 23:41:02,942 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:41:02,942 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:02,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:02,943 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:02,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2021-11-20 23:41:02,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:02,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-20 23:41:02,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:03,695 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 187 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:03,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:03,853 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 187 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:03,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1616001882] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:03,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [410926464] [2021-11-20 23:41:03,855 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:41:03,855 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:03,855 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:03,855 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:03,855 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:04,934 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:05,285 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:05,285 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:05,285 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 46 [2021-11-20 23:41:05,285 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692132444] [2021-11-20 23:41:05,285 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:05,285 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-20 23:41:05,285 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:05,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-20 23:41:05,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=426, Invalid=2544, Unknown=0, NotChecked=0, Total=2970 [2021-11-20 23:41:05,286 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 47 states, 47 states have (on average 2.1702127659574466) internal successors, (102), 46 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:06,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:06,985 INFO L93 Difference]: Finished difference Result 467 states and 489 transitions. [2021-11-20 23:41:06,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-20 23:41:06,985 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.1702127659574466) internal successors, (102), 46 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-20 23:41:06,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:06,986 INFO L225 Difference]: With dead ends: 467 [2021-11-20 23:41:06,986 INFO L226 Difference]: Without dead ends: 428 [2021-11-20 23:41:06,987 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3834 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1723, Invalid=9619, Unknown=0, NotChecked=0, Total=11342 [2021-11-20 23:41:06,987 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 134 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 483 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 295 SdHoareTripleChecker+Invalid, 598 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 483 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:06,987 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 295 Invalid, 598 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 483 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:41:06,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 428 states. [2021-11-20 23:41:07,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 428 to 65. [2021-11-20 23:41:07,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:07,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-20 23:41:07,093 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-20 23:41:07,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:07,093 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-20 23:41:07,093 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.1702127659574466) internal successors, (102), 46 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:07,093 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-20 23:41:07,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-20 23:41:07,094 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:07,094 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:41:07,115 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Ended with exit code 0 [2021-11-20 23:41:07,296 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:07,297 INFO L402 AbstractCegarLoop]: === Iteration 86 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:41:07,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:07,297 INFO L85 PathProgramCache]: Analyzing trace with hash 2057630913, now seen corresponding path program 53 times [2021-11-20 23:41:07,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:07,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478711263] [2021-11-20 23:41:07,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:07,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:07,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:07,612 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 156 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:07,612 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:07,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478711263] [2021-11-20 23:41:07,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [478711263] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:07,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [467826693] [2021-11-20 23:41:07,613 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:41:07,613 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:07,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:07,618 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:07,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-20 23:41:07,694 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-20 23:41:07,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:41:07,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-20 23:41:07,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:08,317 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 187 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:08,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:08,459 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 187 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:08,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [467826693] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:08,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1796533836] [2021-11-20 23:41:08,460 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:41:08,460 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:08,461 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:08,461 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:08,461 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:09,549 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:09,945 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:09,945 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:09,945 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 45 [2021-11-20 23:41:09,945 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192163153] [2021-11-20 23:41:09,946 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:09,946 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-20 23:41:09,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:09,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-20 23:41:09,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=420, Invalid=2442, Unknown=0, NotChecked=0, Total=2862 [2021-11-20 23:41:09,947 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 46 states, 46 states have (on average 2.1956521739130435) internal successors, (101), 45 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:11,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:11,869 INFO L93 Difference]: Finished difference Result 508 states and 531 transitions. [2021-11-20 23:41:11,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-20 23:41:11,870 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.1956521739130435) internal successors, (101), 45 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-20 23:41:11,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:11,871 INFO L225 Difference]: With dead ends: 508 [2021-11-20 23:41:11,871 INFO L226 Difference]: Without dead ends: 469 [2021-11-20 23:41:11,872 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3412 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1563, Invalid=8739, Unknown=0, NotChecked=0, Total=10302 [2021-11-20 23:41:11,872 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 158 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 235 SdHoareTripleChecker+Invalid, 467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:11,872 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 235 Invalid, 467 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 358 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:41:11,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2021-11-20 23:41:11,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 65. [2021-11-20 23:41:11,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:11,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-20 23:41:11,991 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-20 23:41:11,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:11,991 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-20 23:41:11,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.1956521739130435) internal successors, (101), 45 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:11,991 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-20 23:41:11,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-20 23:41:11,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:11,992 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:41:12,014 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Forceful destruction successful, exit code 0 [2021-11-20 23:41:12,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:12,192 INFO L402 AbstractCegarLoop]: === Iteration 87 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:41:12,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:12,193 INFO L85 PathProgramCache]: Analyzing trace with hash 1891190610, now seen corresponding path program 54 times [2021-11-20 23:41:12,193 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:12,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [287278046] [2021-11-20 23:41:12,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:12,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:12,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:12,423 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 156 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:12,424 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:12,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [287278046] [2021-11-20 23:41:12,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [287278046] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:12,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327075874] [2021-11-20 23:41:12,424 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:41:12,424 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:12,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:12,431 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:12,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2021-11-20 23:41:12,472 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:41:12,472 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:41:12,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-20 23:41:12,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:13,007 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 187 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:13,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:13,133 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 187 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:13,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [327075874] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:13,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1849571634] [2021-11-20 23:41:13,134 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:41:13,134 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:13,135 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:13,135 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:13,135 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:14,107 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:14,450 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:14,450 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:14,450 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 44 [2021-11-20 23:41:14,450 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151422686] [2021-11-20 23:41:14,451 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:14,451 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-20 23:41:14,451 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:14,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-20 23:41:14,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=2338, Unknown=0, NotChecked=0, Total=2756 [2021-11-20 23:41:14,452 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 45 states, 45 states have (on average 2.2222222222222223) internal successors, (100), 44 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:16,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:16,362 INFO L93 Difference]: Finished difference Result 548 states and 572 transitions. [2021-11-20 23:41:16,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-20 23:41:16,362 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.2222222222222223) internal successors, (100), 44 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-20 23:41:16,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:16,364 INFO L225 Difference]: With dead ends: 548 [2021-11-20 23:41:16,364 INFO L226 Difference]: Without dead ends: 509 [2021-11-20 23:41:16,365 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2867 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1360, Invalid=7570, Unknown=0, NotChecked=0, Total=8930 [2021-11-20 23:41:16,365 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 246 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:16,365 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [246 Valid, 196 Invalid, 425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 300 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:41:16,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 509 states. [2021-11-20 23:41:16,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 509 to 65. [2021-11-20 23:41:16,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:16,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-20 23:41:16,497 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-20 23:41:16,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:16,497 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-20 23:41:16,497 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.2222222222222223) internal successors, (100), 44 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:16,497 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-20 23:41:16,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-20 23:41:16,497 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:16,498 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:41:16,522 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Ended with exit code 0 [2021-11-20 23:41:16,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:16,698 INFO L402 AbstractCegarLoop]: === Iteration 88 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:41:16,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:16,698 INFO L85 PathProgramCache]: Analyzing trace with hash -1300767071, now seen corresponding path program 55 times [2021-11-20 23:41:16,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:16,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681749772] [2021-11-20 23:41:16,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:16,699 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:16,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:16,982 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 156 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:16,982 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:16,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681749772] [2021-11-20 23:41:16,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1681749772] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:16,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1103806161] [2021-11-20 23:41:16,983 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:41:16,983 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:16,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:16,984 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:16,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2021-11-20 23:41:17,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:17,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-20 23:41:17,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:17,645 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 187 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:17,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:17,796 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 187 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:17,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1103806161] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:17,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2004122050] [2021-11-20 23:41:17,797 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:41:17,797 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:17,798 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:17,798 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:17,798 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:18,914 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:19,330 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:19,330 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:19,330 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 43 [2021-11-20 23:41:19,330 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843271711] [2021-11-20 23:41:19,330 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:19,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-20 23:41:19,331 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:19,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-20 23:41:19,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=420, Invalid=2232, Unknown=0, NotChecked=0, Total=2652 [2021-11-20 23:41:19,331 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 44 states, 44 states have (on average 2.25) internal successors, (99), 43 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:21,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:21,017 INFO L93 Difference]: Finished difference Result 587 states and 612 transitions. [2021-11-20 23:41:21,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-20 23:41:21,017 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.25) internal successors, (99), 43 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-20 23:41:21,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:21,019 INFO L225 Difference]: With dead ends: 587 [2021-11-20 23:41:21,019 INFO L226 Difference]: Without dead ends: 548 [2021-11-20 23:41:21,020 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2214 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1135, Invalid=6175, Unknown=0, NotChecked=0, Total=7310 [2021-11-20 23:41:21,020 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 214 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 367 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:21,020 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [214 Valid, 240 Invalid, 438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 367 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:41:21,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 548 states. [2021-11-20 23:41:21,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 548 to 65. [2021-11-20 23:41:21,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:21,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-11-20 23:41:21,141 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2021-11-20 23:41:21,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:21,141 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-11-20 23:41:21,141 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.25) internal successors, (99), 43 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:21,141 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-11-20 23:41:21,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-20 23:41:21,141 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:21,142 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:41:21,161 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Ended with exit code 0 [2021-11-20 23:41:21,342 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:21,342 INFO L402 AbstractCegarLoop]: === Iteration 89 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:41:21,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:21,342 INFO L85 PathProgramCache]: Analyzing trace with hash 535929202, now seen corresponding path program 11 times [2021-11-20 23:41:21,342 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:21,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160987802] [2021-11-20 23:41:21,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:21,343 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:21,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:21,576 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 156 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:21,576 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:21,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160987802] [2021-11-20 23:41:21,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1160987802] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:21,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [702055483] [2021-11-20 23:41:21,576 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:41:21,576 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:21,576 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:21,577 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:21,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-20 23:41:21,638 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-20 23:41:21,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:41:21,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-20 23:41:21,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:22,152 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:22,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:22,296 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:22,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [702055483] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:22,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [865704322] [2021-11-20 23:41:22,297 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:41:22,297 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:22,297 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:22,298 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:22,298 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:23,182 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:23,590 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:23,590 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:23,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 42 [2021-11-20 23:41:23,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027021399] [2021-11-20 23:41:23,590 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:23,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-20 23:41:23,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:23,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-20 23:41:23,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=425, Invalid=2125, Unknown=0, NotChecked=0, Total=2550 [2021-11-20 23:41:23,592 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 43 states, 43 states have (on average 2.255813953488372) internal successors, (97), 42 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:25,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:25,330 INFO L93 Difference]: Finished difference Result 627 states and 654 transitions. [2021-11-20 23:41:25,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-20 23:41:25,330 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.255813953488372) internal successors, (97), 42 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-20 23:41:25,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:25,332 INFO L225 Difference]: With dead ends: 627 [2021-11-20 23:41:25,332 INFO L226 Difference]: Without dead ends: 588 [2021-11-20 23:41:25,333 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1565 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=926, Invalid=4624, Unknown=0, NotChecked=0, Total=5550 [2021-11-20 23:41:25,333 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 243 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 308 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 308 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:25,333 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [243 Valid, 187 Invalid, 348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 308 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:41:25,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 588 states. [2021-11-20 23:41:25,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 588 to 66. [2021-11-20 23:41:25,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.2307692307692308) internal successors, (80), 65 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:25,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 80 transitions. [2021-11-20 23:41:25,470 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 80 transitions. Word has length 52 [2021-11-20 23:41:25,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:25,470 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 80 transitions. [2021-11-20 23:41:25,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.255813953488372) internal successors, (97), 42 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:25,470 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 80 transitions. [2021-11-20 23:41:25,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-20 23:41:25,471 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:25,471 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:41:25,495 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Ended with exit code 0 [2021-11-20 23:41:25,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable88 [2021-11-20 23:41:25,672 INFO L402 AbstractCegarLoop]: === Iteration 90 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:41:25,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:25,672 INFO L85 PathProgramCache]: Analyzing trace with hash 1303066309, now seen corresponding path program 22 times [2021-11-20 23:41:25,672 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:25,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109458618] [2021-11-20 23:41:25,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:25,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:25,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:25,847 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 78 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:25,847 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:25,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109458618] [2021-11-20 23:41:25,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [109458618] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:25,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471883529] [2021-11-20 23:41:25,848 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:41:25,848 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:25,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:25,850 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:25,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2021-11-20 23:41:25,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:25,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-20 23:41:25,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:26,106 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 78 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:26,106 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:26,262 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 78 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:26,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471883529] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:26,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [275065538] [2021-11-20 23:41:26,263 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:41:26,263 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:26,264 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:26,264 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:26,264 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:27,176 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:27,478 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:27,478 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:27,478 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 16 [2021-11-20 23:41:27,478 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363694336] [2021-11-20 23:41:27,478 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:27,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-20 23:41:27,478 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:27,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-20 23:41:27,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=457, Unknown=0, NotChecked=0, Total=600 [2021-11-20 23:41:27,479 INFO L87 Difference]: Start difference. First operand 66 states and 80 transitions. Second operand has 17 states, 17 states have (on average 3.235294117647059) internal successors, (55), 16 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:27,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:27,845 INFO L93 Difference]: Finished difference Result 77 states and 91 transitions. [2021-11-20 23:41:27,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-20 23:41:27,846 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.235294117647059) internal successors, (55), 16 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-20 23:41:27,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:27,846 INFO L225 Difference]: With dead ends: 77 [2021-11-20 23:41:27,846 INFO L226 Difference]: Without dead ends: 75 [2021-11-20 23:41:27,846 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 158 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 382 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=384, Invalid=1098, Unknown=0, NotChecked=0, Total=1482 [2021-11-20 23:41:27,847 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 56 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:27,847 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 26 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:41:27,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-20 23:41:27,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 69. [2021-11-20 23:41:27,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.2205882352941178) internal successors, (83), 68 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:27,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 83 transitions. [2021-11-20 23:41:27,959 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 83 transitions. Word has length 53 [2021-11-20 23:41:27,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:27,960 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 83 transitions. [2021-11-20 23:41:27,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.235294117647059) internal successors, (55), 16 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:27,960 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 83 transitions. [2021-11-20 23:41:27,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:41:27,960 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:27,960 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:41:27,980 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Ended with exit code 0 [2021-11-20 23:41:28,160 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable89 [2021-11-20 23:41:28,161 INFO L402 AbstractCegarLoop]: === Iteration 91 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:41:28,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:28,161 INFO L85 PathProgramCache]: Analyzing trace with hash 1738833291, now seen corresponding path program 23 times [2021-11-20 23:41:28,161 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:28,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055763065] [2021-11-20 23:41:28,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:28,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:28,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:28,436 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 188 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:28,436 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:28,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055763065] [2021-11-20 23:41:28,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055763065] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:28,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547346387] [2021-11-20 23:41:28,436 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:41:28,436 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:28,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:28,437 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:28,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2021-11-20 23:41:28,487 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-20 23:41:28,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:41:28,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-20 23:41:28,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:29,278 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:29,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:29,421 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:29,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [547346387] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:29,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [277706996] [2021-11-20 23:41:29,422 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:41:29,422 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:29,422 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:29,422 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:29,422 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:30,423 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:30,918 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:30,918 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:30,918 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 57 [2021-11-20 23:41:30,919 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215399786] [2021-11-20 23:41:30,919 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:30,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-20 23:41:30,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:30,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-20 23:41:30,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=676, Invalid=3614, Unknown=0, NotChecked=0, Total=4290 [2021-11-20 23:41:30,920 INFO L87 Difference]: Start difference. First operand 69 states and 83 transitions. Second operand has 58 states, 58 states have (on average 2.0) internal successors, (116), 57 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:31,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:31,838 INFO L93 Difference]: Finished difference Result 164 states and 180 transitions. [2021-11-20 23:41:31,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-20 23:41:31,839 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.0) internal successors, (116), 57 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-20 23:41:31,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:31,839 INFO L225 Difference]: With dead ends: 164 [2021-11-20 23:41:31,839 INFO L226 Difference]: Without dead ends: 122 [2021-11-20 23:41:31,840 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2936 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1329, Invalid=7043, Unknown=0, NotChecked=0, Total=8372 [2021-11-20 23:41:31,840 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 16 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:31,840 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 163 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:41:31,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-20 23:41:31,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 70. [2021-11-20 23:41:31,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:31,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-20 23:41:31,992 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-20 23:41:31,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:31,992 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-20 23:41:31,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.0) internal successors, (116), 57 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:31,992 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-20 23:41:31,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:41:31,993 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:31,993 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:41:32,017 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Ended with exit code 0 [2021-11-20 23:41:32,193 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:32,193 INFO L402 AbstractCegarLoop]: === Iteration 92 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:41:32,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:32,194 INFO L85 PathProgramCache]: Analyzing trace with hash -268140900, now seen corresponding path program 56 times [2021-11-20 23:41:32,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:32,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [555485423] [2021-11-20 23:41:32,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:32,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:32,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:32,525 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 188 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:32,525 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:32,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [555485423] [2021-11-20 23:41:32,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [555485423] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:32,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [103716195] [2021-11-20 23:41:32,525 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:41:32,525 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:32,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:32,526 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:32,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2021-11-20 23:41:32,590 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-20 23:41:32,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:41:32,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-20 23:41:32,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:33,482 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 222 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:33,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:33,651 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 222 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:33,652 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [103716195] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:33,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [921283026] [2021-11-20 23:41:33,652 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:41:33,653 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:33,653 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:33,653 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:33,653 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:34,784 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:35,156 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:35,156 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:35,156 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 56 [2021-11-20 23:41:35,156 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615069056] [2021-11-20 23:41:35,156 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:35,156 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-20 23:41:35,157 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:35,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-20 23:41:35,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=627, Invalid=3533, Unknown=0, NotChecked=0, Total=4160 [2021-11-20 23:41:35,157 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 57 states, 57 states have (on average 2.0350877192982457) internal successors, (116), 56 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:36,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:36,379 INFO L93 Difference]: Finished difference Result 216 states and 233 transitions. [2021-11-20 23:41:36,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-20 23:41:36,379 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.0350877192982457) internal successors, (116), 56 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-20 23:41:36,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:36,380 INFO L225 Difference]: With dead ends: 216 [2021-11-20 23:41:36,380 INFO L226 Difference]: Without dead ends: 174 [2021-11-20 23:41:36,381 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3599 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1574, Invalid=8728, Unknown=0, NotChecked=0, Total=10302 [2021-11-20 23:41:36,381 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 39 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 382 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 442 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 382 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:36,381 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 202 Invalid, 442 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 382 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:41:36,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-11-20 23:41:36,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 70. [2021-11-20 23:41:36,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:36,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-20 23:41:36,546 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-20 23:41:36,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:36,546 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-20 23:41:36,546 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 2.0350877192982457) internal successors, (116), 56 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:36,546 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-20 23:41:36,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:41:36,546 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:36,546 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:41:36,571 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Forceful destruction successful, exit code 0 [2021-11-20 23:41:36,747 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:36,747 INFO L402 AbstractCegarLoop]: === Iteration 93 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:41:36,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:36,747 INFO L85 PathProgramCache]: Analyzing trace with hash 1745327979, now seen corresponding path program 57 times [2021-11-20 23:41:36,747 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:36,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828098158] [2021-11-20 23:41:36,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:36,748 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:36,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:37,056 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 188 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:37,056 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:37,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [828098158] [2021-11-20 23:41:37,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [828098158] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:37,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1509271522] [2021-11-20 23:41:37,056 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:41:37,057 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:37,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:37,057 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:37,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Waiting until timeout for monitored process [2021-11-20 23:41:37,101 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:41:37,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:41:37,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-20 23:41:37,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:37,814 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 222 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:37,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:37,949 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 222 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:37,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1509271522] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:37,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [109251298] [2021-11-20 23:41:37,950 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:41:37,950 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:37,950 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:37,950 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:37,951 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:38,847 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:39,242 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:39,242 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:39,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2021-11-20 23:41:39,242 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339804935] [2021-11-20 23:41:39,242 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:39,243 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-20 23:41:39,243 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:39,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-20 23:41:39,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=594, Invalid=3438, Unknown=0, NotChecked=0, Total=4032 [2021-11-20 23:41:39,243 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 56 states, 56 states have (on average 2.0535714285714284) internal successors, (115), 55 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:40,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:40,840 INFO L93 Difference]: Finished difference Result 267 states and 285 transitions. [2021-11-20 23:41:40,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-20 23:41:40,841 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.0535714285714284) internal successors, (115), 55 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-20 23:41:40,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:40,841 INFO L225 Difference]: With dead ends: 267 [2021-11-20 23:41:40,841 INFO L226 Difference]: Without dead ends: 225 [2021-11-20 23:41:40,842 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4192 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1826, Invalid=10164, Unknown=0, NotChecked=0, Total=11990 [2021-11-20 23:41:40,842 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 57 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 512 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 282 SdHoareTripleChecker+Invalid, 582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 512 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:40,842 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 282 Invalid, 582 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 512 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:41:40,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2021-11-20 23:41:40,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 70. [2021-11-20 23:41:40,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:40,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-20 23:41:40,977 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-20 23:41:40,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:40,977 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-20 23:41:40,978 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.0535714285714284) internal successors, (115), 55 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:40,978 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-20 23:41:40,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:41:40,978 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:40,978 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:41:40,998 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Ended with exit code 0 [2021-11-20 23:41:41,178 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:41,179 INFO L402 AbstractCegarLoop]: === Iteration 94 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:41:41,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:41,179 INFO L85 PathProgramCache]: Analyzing trace with hash 1810278588, now seen corresponding path program 58 times [2021-11-20 23:41:41,179 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:41,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624010816] [2021-11-20 23:41:41,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:41,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:41,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:41,446 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 188 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:41,447 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:41,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624010816] [2021-11-20 23:41:41,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [624010816] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:41,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768742940] [2021-11-20 23:41:41,447 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:41:41,447 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:41,447 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:41,475 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:41,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Waiting until timeout for monitored process [2021-11-20 23:41:41,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:41,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-20 23:41:41,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:42,322 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 222 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:42,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:42,471 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 222 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:42,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1768742940] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:42,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [57337947] [2021-11-20 23:41:42,472 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:41:42,472 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:42,472 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:42,473 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:42,473 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:43,478 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:43,865 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:43,865 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:43,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 54 [2021-11-20 23:41:43,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253969588] [2021-11-20 23:41:43,866 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:43,866 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-20 23:41:43,866 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:43,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-20 23:41:43,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=565, Invalid=3341, Unknown=0, NotChecked=0, Total=3906 [2021-11-20 23:41:43,867 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 55 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 54 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:45,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:45,899 INFO L93 Difference]: Finished difference Result 317 states and 336 transitions. [2021-11-20 23:41:45,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-20 23:41:45,900 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 54 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-20 23:41:45,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:45,901 INFO L225 Difference]: With dead ends: 317 [2021-11-20 23:41:45,901 INFO L226 Difference]: Without dead ends: 275 [2021-11-20 23:41:45,902 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4668 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2036, Invalid=11304, Unknown=0, NotChecked=0, Total=13340 [2021-11-20 23:41:45,902 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 60 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 421 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 421 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:45,902 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 239 Invalid, 506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 421 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:41:45,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2021-11-20 23:41:46,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 70. [2021-11-20 23:41:46,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:46,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-20 23:41:46,084 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-20 23:41:46,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:46,085 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-20 23:41:46,085 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 54 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:46,085 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-20 23:41:46,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:41:46,085 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:46,085 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 8, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:41:46,110 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Ended with exit code 0 [2021-11-20 23:41:46,285 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:46,286 INFO L402 AbstractCegarLoop]: === Iteration 95 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:41:46,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:46,286 INFO L85 PathProgramCache]: Analyzing trace with hash -265836213, now seen corresponding path program 59 times [2021-11-20 23:41:46,286 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:46,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738710886] [2021-11-20 23:41:46,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:46,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:46,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:46,545 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 188 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:46,546 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:46,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738710886] [2021-11-20 23:41:46,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1738710886] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:46,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1465898482] [2021-11-20 23:41:46,546 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:41:46,546 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:46,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:46,547 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:46,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2021-11-20 23:41:46,598 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-20 23:41:46,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:41:46,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-20 23:41:46,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:47,296 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 222 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:47,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:47,442 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 222 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:47,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1465898482] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:47,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1924932419] [2021-11-20 23:41:47,443 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:41:47,443 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:47,443 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:47,443 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:47,443 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:48,488 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:48,911 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:48,911 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:48,911 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 53 [2021-11-20 23:41:48,911 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208354997] [2021-11-20 23:41:48,911 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:48,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-20 23:41:48,912 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:48,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-20 23:41:48,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=3242, Unknown=0, NotChecked=0, Total=3782 [2021-11-20 23:41:48,912 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 54 states, 54 states have (on average 2.0925925925925926) internal successors, (113), 53 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:50,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:50,913 INFO L93 Difference]: Finished difference Result 366 states and 386 transitions. [2021-11-20 23:41:50,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-20 23:41:50,913 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.0925925925925926) internal successors, (113), 53 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-20 23:41:50,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:50,914 INFO L225 Difference]: With dead ends: 366 [2021-11-20 23:41:50,914 INFO L226 Difference]: Without dead ends: 324 [2021-11-20 23:41:50,915 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5001 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2186, Invalid=12094, Unknown=0, NotChecked=0, Total=14280 [2021-11-20 23:41:50,915 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 66 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 412 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 503 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 412 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:50,915 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 247 Invalid, 503 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 412 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:41:50,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2021-11-20 23:41:51,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 70. [2021-11-20 23:41:51,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:51,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-20 23:41:51,080 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-20 23:41:51,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:51,080 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-20 23:41:51,080 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.0925925925925926) internal successors, (113), 53 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:51,080 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-20 23:41:51,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:41:51,081 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:51,081 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 7, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:41:51,103 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Ended with exit code 0 [2021-11-20 23:41:51,281 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable94 [2021-11-20 23:41:51,281 INFO L402 AbstractCegarLoop]: === Iteration 96 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:41:51,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:51,282 INFO L85 PathProgramCache]: Analyzing trace with hash 2022496988, now seen corresponding path program 60 times [2021-11-20 23:41:51,282 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:51,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506656722] [2021-11-20 23:41:51,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:51,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:51,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:51,563 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 188 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:51,563 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:51,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506656722] [2021-11-20 23:41:51,563 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [506656722] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:51,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1105059167] [2021-11-20 23:41:51,563 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:41:51,563 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:51,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:51,564 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:51,565 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Waiting until timeout for monitored process [2021-11-20 23:41:51,609 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:41:51,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:41:51,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-20 23:41:51,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:52,307 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 222 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:52,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:52,473 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 222 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:52,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1105059167] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:52,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1477363456] [2021-11-20 23:41:52,474 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:41:52,474 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:52,474 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:52,474 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:52,474 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:53,569 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:54,009 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:54,009 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:54,009 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 52 [2021-11-20 23:41:54,010 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256760501] [2021-11-20 23:41:54,010 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:54,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-20 23:41:54,010 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:54,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-20 23:41:54,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=519, Invalid=3141, Unknown=0, NotChecked=0, Total=3660 [2021-11-20 23:41:54,011 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 53 states, 53 states have (on average 2.1132075471698113) internal successors, (112), 52 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:56,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:56,342 INFO L93 Difference]: Finished difference Result 414 states and 435 transitions. [2021-11-20 23:41:56,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-20 23:41:56,342 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.1132075471698113) internal successors, (112), 52 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-20 23:41:56,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:56,344 INFO L225 Difference]: With dead ends: 414 [2021-11-20 23:41:56,344 INFO L226 Difference]: Without dead ends: 372 [2021-11-20 23:41:56,345 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5164 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2264, Invalid=12498, Unknown=0, NotChecked=0, Total=14762 [2021-11-20 23:41:56,345 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 95 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 492 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 492 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:56,345 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 277 Invalid, 610 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 492 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:41:56,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2021-11-20 23:41:56,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 70. [2021-11-20 23:41:56,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:56,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-20 23:41:56,507 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-20 23:41:56,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:56,508 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-20 23:41:56,508 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.1132075471698113) internal successors, (112), 52 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:56,508 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-20 23:41:56,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:41:56,508 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:56,509 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:41:56,531 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Ended with exit code 0 [2021-11-20 23:41:56,709 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:56,709 INFO L402 AbstractCegarLoop]: === Iteration 97 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:41:56,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:56,710 INFO L85 PathProgramCache]: Analyzing trace with hash 987935531, now seen corresponding path program 61 times [2021-11-20 23:41:56,710 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:56,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [654496103] [2021-11-20 23:41:56,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:56,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:56,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:56,992 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 188 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:56,992 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:56,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [654496103] [2021-11-20 23:41:56,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [654496103] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:56,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [656841900] [2021-11-20 23:41:56,993 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:41:56,993 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:56,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:57,023 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:57,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Waiting until timeout for monitored process [2021-11-20 23:41:57,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:57,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-20 23:41:57,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:57,841 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 222 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:57,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:57,999 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 222 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:57,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [656841900] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:57,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [196866543] [2021-11-20 23:41:58,000 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:41:58,000 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:58,000 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:58,001 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:58,001 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:58,978 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:59,346 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:59,346 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:59,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 51 [2021-11-20 23:41:59,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955799268] [2021-11-20 23:41:59,346 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:59,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-20 23:41:59,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:59,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-20 23:41:59,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=3038, Unknown=0, NotChecked=0, Total=3540 [2021-11-20 23:41:59,350 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 52 states, 52 states have (on average 2.1346153846153846) internal successors, (111), 51 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:01,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:42:01,677 INFO L93 Difference]: Finished difference Result 461 states and 483 transitions. [2021-11-20 23:42:01,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-20 23:42:01,677 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.1346153846153846) internal successors, (111), 51 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-20 23:42:01,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:42:01,678 INFO L225 Difference]: With dead ends: 461 [2021-11-20 23:42:01,678 INFO L226 Difference]: Without dead ends: 419 [2021-11-20 23:42:01,679 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5142 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2264, Invalid=12498, Unknown=0, NotChecked=0, Total=14762 [2021-11-20 23:42:01,679 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 107 mSDsluCounter, 240 mSDsCounter, 0 mSdLazyCounter, 426 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 527 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 426 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:42:01,679 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 255 Invalid, 527 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 426 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:42:01,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2021-11-20 23:42:01,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 70. [2021-11-20 23:42:01,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:01,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-20 23:42:01,829 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-20 23:42:01,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:42:01,829 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-20 23:42:01,830 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.1346153846153846) internal successors, (111), 51 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:01,830 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-20 23:42:01,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:42:01,830 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:42:01,831 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 7, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:42:01,854 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Ended with exit code 0 [2021-11-20 23:42:02,038 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:02,039 INFO L402 AbstractCegarLoop]: === Iteration 98 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:42:02,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:42:02,039 INFO L85 PathProgramCache]: Analyzing trace with hash 123278588, now seen corresponding path program 62 times [2021-11-20 23:42:02,039 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:42:02,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1715477020] [2021-11-20 23:42:02,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:42:02,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:42:02,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:02,343 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 188 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:02,343 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:42:02,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1715477020] [2021-11-20 23:42:02,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1715477020] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:42:02,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [25049342] [2021-11-20 23:42:02,343 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:42:02,344 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:02,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:42:02,346 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:42:02,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2021-11-20 23:42:02,395 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-20 23:42:02,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:42:02,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-20 23:42:02,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:42:03,023 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 222 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:03,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:42:03,162 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 222 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:03,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [25049342] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:42:03,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1025092976] [2021-11-20 23:42:03,163 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:42:03,163 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:42:03,164 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:42:03,164 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:42:03,164 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:42:04,130 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:42:04,512 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:42:04,512 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:42:04,513 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 50 [2021-11-20 23:42:04,513 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038221800] [2021-11-20 23:42:04,513 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:42:04,513 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-20 23:42:04,513 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:42:04,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-20 23:42:04,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=489, Invalid=2933, Unknown=0, NotChecked=0, Total=3422 [2021-11-20 23:42:04,514 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 51 states, 51 states have (on average 2.156862745098039) internal successors, (110), 50 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:07,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:42:07,223 INFO L93 Difference]: Finished difference Result 507 states and 530 transitions. [2021-11-20 23:42:07,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-20 23:42:07,224 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.156862745098039) internal successors, (110), 50 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-20 23:42:07,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:42:07,226 INFO L225 Difference]: With dead ends: 507 [2021-11-20 23:42:07,226 INFO L226 Difference]: Without dead ends: 465 [2021-11-20 23:42:07,227 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4932 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2186, Invalid=12094, Unknown=0, NotChecked=0, Total=14280 [2021-11-20 23:42:07,227 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 127 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 416 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 416 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:42:07,227 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 250 Invalid, 532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 416 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:42:07,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2021-11-20 23:42:07,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 70. [2021-11-20 23:42:07,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:07,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-20 23:42:07,426 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-20 23:42:07,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:42:07,427 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-20 23:42:07,427 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.156862745098039) internal successors, (110), 50 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:07,427 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-20 23:42:07,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:42:07,428 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:42:07,428 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 8, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:42:07,467 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Ended with exit code 0 [2021-11-20 23:42:07,642 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable97,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:07,642 INFO L402 AbstractCegarLoop]: === Iteration 99 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:42:07,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:42:07,642 INFO L85 PathProgramCache]: Analyzing trace with hash -1567181557, now seen corresponding path program 63 times [2021-11-20 23:42:07,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:42:07,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1423621291] [2021-11-20 23:42:07,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:42:07,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:42:07,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:08,047 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 188 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:08,048 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:42:08,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1423621291] [2021-11-20 23:42:08,048 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1423621291] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:42:08,048 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1002191384] [2021-11-20 23:42:08,048 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:42:08,048 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:08,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:42:08,049 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:42:08,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Waiting until timeout for monitored process [2021-11-20 23:42:08,105 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:42:08,105 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:42:08,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-20 23:42:08,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:42:08,887 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 222 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:08,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:42:09,066 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 222 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:09,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1002191384] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:42:09,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1400769939] [2021-11-20 23:42:09,067 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:42:09,067 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:42:09,068 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:42:09,068 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:42:09,068 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:42:10,191 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:42:10,577 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:42:10,577 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:42:10,577 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 49 [2021-11-20 23:42:10,577 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083436047] [2021-11-20 23:42:10,577 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:42:10,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-20 23:42:10,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:42:10,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-20 23:42:10,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=480, Invalid=2826, Unknown=0, NotChecked=0, Total=3306 [2021-11-20 23:42:10,578 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 50 states, 50 states have (on average 2.18) internal successors, (109), 49 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:13,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:42:13,100 INFO L93 Difference]: Finished difference Result 552 states and 576 transitions. [2021-11-20 23:42:13,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-20 23:42:13,100 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.18) internal successors, (109), 49 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-20 23:42:13,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:42:13,102 INFO L225 Difference]: With dead ends: 552 [2021-11-20 23:42:13,102 INFO L226 Difference]: Without dead ends: 510 [2021-11-20 23:42:13,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4543 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2036, Invalid=11304, Unknown=0, NotChecked=0, Total=13340 [2021-11-20 23:42:13,103 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 161 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 108 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:42:13,103 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [161 Valid, 241 Invalid, 506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 398 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:42:13,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 510 states. [2021-11-20 23:42:13,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 510 to 70. [2021-11-20 23:42:13,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:13,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-20 23:42:13,281 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-20 23:42:13,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:42:13,281 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-20 23:42:13,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.18) internal successors, (109), 49 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:13,281 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-20 23:42:13,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:42:13,282 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:42:13,282 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:42:13,304 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Ended with exit code 0 [2021-11-20 23:42:13,482 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:13,482 INFO L402 AbstractCegarLoop]: === Iteration 100 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:42:13,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:42:13,483 INFO L85 PathProgramCache]: Analyzing trace with hash -97691876, now seen corresponding path program 64 times [2021-11-20 23:42:13,483 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:42:13,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [517688380] [2021-11-20 23:42:13,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:42:13,483 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:42:13,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:13,833 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 188 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:13,833 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:42:13,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [517688380] [2021-11-20 23:42:13,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [517688380] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:42:13,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1866909334] [2021-11-20 23:42:13,834 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:42:13,834 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:13,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:42:13,835 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:42:13,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Waiting until timeout for monitored process [2021-11-20 23:42:13,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:13,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-20 23:42:13,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:42:14,562 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 222 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:14,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:42:14,724 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 222 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:14,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1866909334] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:42:14,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [183181989] [2021-11-20 23:42:14,725 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:42:14,725 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:42:14,725 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:42:14,725 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:42:14,725 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:42:15,884 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:42:16,313 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:42:16,313 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:42:16,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 48 [2021-11-20 23:42:16,313 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623600630] [2021-11-20 23:42:16,314 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:42:16,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-20 23:42:16,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:42:16,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-20 23:42:16,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=475, Invalid=2717, Unknown=0, NotChecked=0, Total=3192 [2021-11-20 23:42:16,315 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 49 states, 49 states have (on average 2.204081632653061) internal successors, (108), 48 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:19,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:42:19,019 INFO L93 Difference]: Finished difference Result 596 states and 621 transitions. [2021-11-20 23:42:19,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-20 23:42:19,019 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.204081632653061) internal successors, (108), 48 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-20 23:42:19,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:42:19,022 INFO L225 Difference]: With dead ends: 596 [2021-11-20 23:42:19,022 INFO L226 Difference]: Without dead ends: 554 [2021-11-20 23:42:19,023 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3996 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1826, Invalid=10164, Unknown=0, NotChecked=0, Total=11990 [2021-11-20 23:42:19,024 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 224 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 360 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 224 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 495 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 360 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:42:19,024 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [224 Valid, 223 Invalid, 495 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 360 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:42:19,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2021-11-20 23:42:19,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 70. [2021-11-20 23:42:19,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:19,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-20 23:42:19,221 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-20 23:42:19,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:42:19,221 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-20 23:42:19,221 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.204081632653061) internal successors, (108), 48 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:19,221 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-20 23:42:19,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:42:19,221 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:42:19,222 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:42:19,246 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Ended with exit code 0 [2021-11-20 23:42:19,422 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable99 [2021-11-20 23:42:19,422 INFO L402 AbstractCegarLoop]: === Iteration 101 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:42:19,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:42:19,422 INFO L85 PathProgramCache]: Analyzing trace with hash -2128498965, now seen corresponding path program 65 times [2021-11-20 23:42:19,423 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:42:19,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [42253866] [2021-11-20 23:42:19,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:42:19,423 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:42:19,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:19,748 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 188 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:19,748 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:42:19,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [42253866] [2021-11-20 23:42:19,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [42253866] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:42:19,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1255186143] [2021-11-20 23:42:19,748 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:42:19,749 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:19,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:42:19,749 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:42:19,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2021-11-20 23:42:19,811 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-20 23:42:19,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:42:19,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-20 23:42:19,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:42:20,467 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 222 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:20,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:42:20,631 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 222 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:20,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1255186143] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:42:20,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1225377318] [2021-11-20 23:42:20,632 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:42:20,632 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:42:20,632 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:42:20,632 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:42:20,632 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:42:21,597 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:42:21,994 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:42:21,994 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:42:21,995 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 47 [2021-11-20 23:42:21,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847550395] [2021-11-20 23:42:21,995 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:42:21,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-20 23:42:21,995 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:42:21,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-20 23:42:21,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=474, Invalid=2606, Unknown=0, NotChecked=0, Total=3080 [2021-11-20 23:42:21,996 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 48 states, 48 states have (on average 2.2291666666666665) internal successors, (107), 47 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:24,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:42:24,713 INFO L93 Difference]: Finished difference Result 639 states and 665 transitions. [2021-11-20 23:42:24,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-20 23:42:24,713 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.2291666666666665) internal successors, (107), 47 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-20 23:42:24,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:42:24,715 INFO L225 Difference]: With dead ends: 639 [2021-11-20 23:42:24,715 INFO L226 Difference]: Without dead ends: 597 [2021-11-20 23:42:24,715 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3324 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1574, Invalid=8728, Unknown=0, NotChecked=0, Total=10302 [2021-11-20 23:42:24,716 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 285 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 348 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 285 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 469 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 348 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:42:24,716 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [285 Valid, 224 Invalid, 469 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 348 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:42:24,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 597 states. [2021-11-20 23:42:24,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 597 to 70. [2021-11-20 23:42:24,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:24,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-20 23:42:24,917 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-20 23:42:24,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:42:24,917 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-20 23:42:24,917 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.2291666666666665) internal successors, (107), 47 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:24,917 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-20 23:42:24,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:42:24,918 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:42:24,918 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:42:24,940 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Forceful destruction successful, exit code 0 [2021-11-20 23:42:25,118 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable100,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:25,118 INFO L402 AbstractCegarLoop]: === Iteration 102 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:42:25,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:42:25,119 INFO L85 PathProgramCache]: Analyzing trace with hash 1131127100, now seen corresponding path program 66 times [2021-11-20 23:42:25,119 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:42:25,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492826270] [2021-11-20 23:42:25,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:42:25,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:42:25,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:25,455 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 188 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:25,455 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:42:25,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492826270] [2021-11-20 23:42:25,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [492826270] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:42:25,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1385396479] [2021-11-20 23:42:25,455 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:42:25,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:25,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:42:25,456 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:42:25,457 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Waiting until timeout for monitored process [2021-11-20 23:42:25,511 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:42:25,511 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:42:25,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-20 23:42:25,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:42:26,226 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 222 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:26,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:42:26,419 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 222 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:26,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1385396479] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:42:26,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [563671343] [2021-11-20 23:42:26,420 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:42:26,421 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:42:26,421 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:42:26,421 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:42:26,421 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:42:27,517 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:42:27,950 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:42:27,950 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:42:27,950 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 46 [2021-11-20 23:42:27,950 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316572306] [2021-11-20 23:42:27,950 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:42:27,951 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-20 23:42:27,951 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:42:27,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-20 23:42:27,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=2493, Unknown=0, NotChecked=0, Total=2970 [2021-11-20 23:42:27,951 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 47 states, 47 states have (on average 2.25531914893617) internal successors, (106), 46 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:30,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:42:30,624 INFO L93 Difference]: Finished difference Result 681 states and 708 transitions. [2021-11-20 23:42:30,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-20 23:42:30,625 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.25531914893617) internal successors, (106), 46 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-20 23:42:30,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:42:30,625 INFO L225 Difference]: With dead ends: 681 [2021-11-20 23:42:30,625 INFO L226 Difference]: Without dead ends: 639 [2021-11-20 23:42:30,626 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2546 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1304, Invalid=7068, Unknown=0, NotChecked=0, Total=8372 [2021-11-20 23:42:30,626 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 203 mSDsluCounter, 281 mSDsCounter, 0 mSdLazyCounter, 459 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 539 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 459 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:42:30,626 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [203 Valid, 290 Invalid, 539 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 459 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:42:30,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 639 states. [2021-11-20 23:42:30,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 639 to 70. [2021-11-20 23:42:30,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:30,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-11-20 23:42:30,812 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2021-11-20 23:42:30,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:42:30,813 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-11-20 23:42:30,813 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.25531914893617) internal successors, (106), 46 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:30,813 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-11-20 23:42:30,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:42:30,813 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:42:30,813 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:42:30,835 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Ended with exit code 0 [2021-11-20 23:42:31,014 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable101 [2021-11-20 23:42:31,014 INFO L402 AbstractCegarLoop]: === Iteration 103 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:42:31,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:42:31,014 INFO L85 PathProgramCache]: Analyzing trace with hash 266445003, now seen corresponding path program 12 times [2021-11-20 23:42:31,015 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:42:31,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811561867] [2021-11-20 23:42:31,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:42:31,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:42:31,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:31,304 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 188 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:31,304 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:42:31,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811561867] [2021-11-20 23:42:31,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [811561867] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:42:31,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2014403679] [2021-11-20 23:42:31,304 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:42:31,304 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:31,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:42:31,307 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:42:31,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Waiting until timeout for monitored process [2021-11-20 23:42:31,354 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:42:31,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:42:31,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-20 23:42:31,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:42:31,972 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:31,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:42:32,129 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:32,130 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2014403679] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:42:32,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1326535175] [2021-11-20 23:42:32,130 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:42:32,130 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:42:32,131 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:42:32,131 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:42:32,131 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:42:33,183 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:42:33,699 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:42:33,700 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:42:33,700 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 45 [2021-11-20 23:42:33,700 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813353773] [2021-11-20 23:42:33,700 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:42:33,700 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-20 23:42:33,701 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:42:33,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-20 23:42:33,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=483, Invalid=2379, Unknown=0, NotChecked=0, Total=2862 [2021-11-20 23:42:33,702 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 46 states, 46 states have (on average 2.260869565217391) internal successors, (104), 45 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:36,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:42:36,115 INFO L93 Difference]: Finished difference Result 724 states and 753 transitions. [2021-11-20 23:42:36,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-20 23:42:36,116 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.260869565217391) internal successors, (104), 45 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-20 23:42:36,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:42:36,116 INFO L225 Difference]: With dead ends: 724 [2021-11-20 23:42:36,117 INFO L226 Difference]: Without dead ends: 682 [2021-11-20 23:42:36,117 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1786 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1058, Invalid=5262, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 23:42:36,117 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 240 mSDsluCounter, 200 mSDsCounter, 0 mSdLazyCounter, 353 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 240 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:42:36,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [240 Valid, 207 Invalid, 392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 353 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:42:36,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 682 states. [2021-11-20 23:42:36,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 682 to 71. [2021-11-20 23:42:36,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.2285714285714286) internal successors, (86), 70 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:36,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 86 transitions. [2021-11-20 23:42:36,321 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 86 transitions. Word has length 56 [2021-11-20 23:42:36,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:42:36,321 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 86 transitions. [2021-11-20 23:42:36,321 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.260869565217391) internal successors, (104), 45 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:36,321 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 86 transitions. [2021-11-20 23:42:36,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-20 23:42:36,322 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:42:36,322 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:42:36,350 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Forceful destruction successful, exit code 0 [2021-11-20 23:42:36,526 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable102 [2021-11-20 23:42:36,526 INFO L402 AbstractCegarLoop]: === Iteration 104 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:42:36,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:42:36,526 INFO L85 PathProgramCache]: Analyzing trace with hash 618943759, now seen corresponding path program 24 times [2021-11-20 23:42:36,527 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:42:36,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [705883037] [2021-11-20 23:42:36,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:42:36,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:42:36,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:36,675 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 91 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:36,675 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:42:36,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [705883037] [2021-11-20 23:42:36,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [705883037] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:42:36,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529950697] [2021-11-20 23:42:36,675 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:42:36,675 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:36,675 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:42:36,676 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:42:36,677 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2021-11-20 23:42:36,729 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:42:36,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:42:36,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-20 23:42:36,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:42:36,861 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 91 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:36,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:42:36,989 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 91 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:36,989 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529950697] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:42:36,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [150425906] [2021-11-20 23:42:36,990 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:42:36,990 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:42:36,990 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:42:36,990 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:42:36,990 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:42:38,073 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:42:38,375 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:42:38,375 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:42:38,375 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 17 [2021-11-20 23:42:38,375 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506401500] [2021-11-20 23:42:38,375 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:42:38,376 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-20 23:42:38,376 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:42:38,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-20 23:42:38,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=492, Unknown=0, NotChecked=0, Total=650 [2021-11-20 23:42:38,376 INFO L87 Difference]: Start difference. First operand 71 states and 86 transitions. Second operand has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:38,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:42:38,893 INFO L93 Difference]: Finished difference Result 82 states and 97 transitions. [2021-11-20 23:42:38,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-20 23:42:38,893 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-20 23:42:38,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:42:38,894 INFO L225 Difference]: With dead ends: 82 [2021-11-20 23:42:38,894 INFO L226 Difference]: Without dead ends: 80 [2021-11-20 23:42:38,894 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 171 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 425 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=431, Invalid=1209, Unknown=0, NotChecked=0, Total=1640 [2021-11-20 23:42:38,894 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 60 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 292 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:42:38,894 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 23 Invalid, 292 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:42:38,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-20 23:42:39,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 74. [2021-11-20 23:42:39,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.2191780821917808) internal successors, (89), 73 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:39,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 89 transitions. [2021-11-20 23:42:39,088 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 89 transitions. Word has length 57 [2021-11-20 23:42:39,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:42:39,088 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 89 transitions. [2021-11-20 23:42:39,088 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:39,088 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 89 transitions. [2021-11-20 23:42:39,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:42:39,089 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:42:39,089 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:42:39,112 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Ended with exit code 0 [2021-11-20 23:42:39,292 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable103,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:39,293 INFO L402 AbstractCegarLoop]: === Iteration 105 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:42:39,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:42:39,293 INFO L85 PathProgramCache]: Analyzing trace with hash 663765761, now seen corresponding path program 25 times [2021-11-20 23:42:39,293 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:42:39,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1775352572] [2021-11-20 23:42:39,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:42:39,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:42:39,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:39,653 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 223 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:39,654 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:42:39,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1775352572] [2021-11-20 23:42:39,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1775352572] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:42:39,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [556564405] [2021-11-20 23:42:39,654 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:42:39,654 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:39,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:42:39,679 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:42:39,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2021-11-20 23:42:39,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:39,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-20 23:42:39,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:42:40,729 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:40,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:42:40,884 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:40,884 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [556564405] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:42:40,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [252729531] [2021-11-20 23:42:40,885 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:42:40,885 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:42:40,885 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:42:40,885 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:42:40,885 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:42:42,064 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:42:42,522 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:42:42,522 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:42:42,522 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 61 [2021-11-20 23:42:42,522 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476712258] [2021-11-20 23:42:42,522 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:42:42,522 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-20 23:42:42,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:42:42,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-20 23:42:42,523 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=766, Invalid=4064, Unknown=0, NotChecked=0, Total=4830 [2021-11-20 23:42:42,523 INFO L87 Difference]: Start difference. First operand 74 states and 89 transitions. Second operand has 62 states, 62 states have (on average 2.0) internal successors, (124), 61 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:43,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:42:43,628 INFO L93 Difference]: Finished difference Result 176 states and 193 transitions. [2021-11-20 23:42:43,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-20 23:42:43,628 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.0) internal successors, (124), 61 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-20 23:42:43,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:42:43,629 INFO L225 Difference]: With dead ends: 176 [2021-11-20 23:42:43,629 INFO L226 Difference]: Without dead ends: 131 [2021-11-20 23:42:43,629 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3351 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1511, Invalid=7995, Unknown=0, NotChecked=0, Total=9506 [2021-11-20 23:42:43,630 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 27 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 365 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:42:43,630 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 181 Invalid, 365 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:42:43,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-11-20 23:42:43,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 75. [2021-11-20 23:42:43,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:43,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-20 23:42:43,858 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-20 23:42:43,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:42:43,858 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-20 23:42:43,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.0) internal successors, (124), 61 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:43,858 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-20 23:42:43,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:42:43,859 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:42:43,859 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:42:43,884 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Ended with exit code 0 [2021-11-20 23:42:44,059 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:44,059 INFO L402 AbstractCegarLoop]: === Iteration 106 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:42:44,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:42:44,060 INFO L85 PathProgramCache]: Analyzing trace with hash -1896393838, now seen corresponding path program 67 times [2021-11-20 23:42:44,060 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:42:44,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207926646] [2021-11-20 23:42:44,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:42:44,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:42:44,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:44,427 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 223 proven. 116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:44,427 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:42:44,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207926646] [2021-11-20 23:42:44,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207926646] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:42:44,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [958289100] [2021-11-20 23:42:44,427 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:42:44,427 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:44,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:42:44,428 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:42:44,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Waiting until timeout for monitored process [2021-11-20 23:42:44,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:44,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-20 23:42:44,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:42:45,471 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 260 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:45,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:42:45,627 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 260 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:45,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [958289100] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:42:45,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [906788294] [2021-11-20 23:42:45,627 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:42:45,628 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:42:45,628 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:42:45,628 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:42:45,628 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:42:46,698 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:42:47,158 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:42:47,158 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:42:47,158 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 60 [2021-11-20 23:42:47,159 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652562331] [2021-11-20 23:42:47,159 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:42:47,159 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-20 23:42:47,159 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:42:47,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-20 23:42:47,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=714, Invalid=3978, Unknown=0, NotChecked=0, Total=4692 [2021-11-20 23:42:47,160 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 61 states, 61 states have (on average 2.0327868852459017) internal successors, (124), 60 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:48,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:42:48,780 INFO L93 Difference]: Finished difference Result 232 states and 250 transitions. [2021-11-20 23:42:48,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-20 23:42:48,780 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.0327868852459017) internal successors, (124), 60 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-20 23:42:48,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:42:48,781 INFO L225 Difference]: With dead ends: 232 [2021-11-20 23:42:48,781 INFO L226 Difference]: Without dead ends: 187 [2021-11-20 23:42:48,781 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4136 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1804, Invalid=9968, Unknown=0, NotChecked=0, Total=11772 [2021-11-20 23:42:48,782 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 39 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:42:48,782 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 230 Invalid, 509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 446 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:42:48,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-11-20 23:42:49,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 75. [2021-11-20 23:42:49,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:49,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-20 23:42:49,018 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-20 23:42:49,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:42:49,018 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-20 23:42:49,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.0327868852459017) internal successors, (124), 60 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:49,018 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-20 23:42:49,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:42:49,019 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:42:49,019 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:42:49,043 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Ended with exit code 0 [2021-11-20 23:42:49,219 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable105 [2021-11-20 23:42:49,219 INFO L402 AbstractCegarLoop]: === Iteration 107 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:42:49,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:42:49,220 INFO L85 PathProgramCache]: Analyzing trace with hash -1424790303, now seen corresponding path program 68 times [2021-11-20 23:42:49,220 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:42:49,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1924867262] [2021-11-20 23:42:49,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:42:49,220 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:42:49,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:49,642 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 223 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:49,642 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:42:49,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1924867262] [2021-11-20 23:42:49,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1924867262] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:42:49,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855887341] [2021-11-20 23:42:49,642 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:42:49,642 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:49,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:42:49,643 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:42:49,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2021-11-20 23:42:49,708 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-20 23:42:49,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:42:49,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-20 23:42:49,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:42:50,570 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 260 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:50,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:42:50,723 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 260 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:50,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1855887341] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:42:50,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [798477490] [2021-11-20 23:42:50,724 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:42:50,724 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:42:50,724 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:42:50,724 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:42:50,724 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:42:51,718 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:42:52,146 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:42:52,146 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:42:52,146 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 59 [2021-11-20 23:42:52,146 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195395977] [2021-11-20 23:42:52,146 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:42:52,147 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-20 23:42:52,147 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:42:52,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-20 23:42:52,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=678, Invalid=3878, Unknown=0, NotChecked=0, Total=4556 [2021-11-20 23:42:52,147 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 60 states, 60 states have (on average 2.05) internal successors, (123), 59 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:54,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:42:54,281 INFO L93 Difference]: Finished difference Result 287 states and 306 transitions. [2021-11-20 23:42:54,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-20 23:42:54,281 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.05) internal successors, (123), 59 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-20 23:42:54,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:42:54,281 INFO L225 Difference]: With dead ends: 287 [2021-11-20 23:42:54,281 INFO L226 Difference]: Without dead ends: 242 [2021-11-20 23:42:54,282 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4859 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2110, Invalid=11696, Unknown=0, NotChecked=0, Total=13806 [2021-11-20 23:42:54,282 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 34 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 458 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 264 SdHoareTripleChecker+Invalid, 520 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:42:54,283 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 264 Invalid, 520 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 458 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:42:54,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2021-11-20 23:42:54,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 75. [2021-11-20 23:42:54,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:54,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-20 23:42:54,545 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-20 23:42:54,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:42:54,545 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-20 23:42:54,545 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 2.05) internal successors, (123), 59 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:54,545 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-20 23:42:54,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:42:54,546 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:42:54,546 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:42:54,571 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Ended with exit code 0 [2021-11-20 23:42:54,746 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable106,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:54,746 INFO L402 AbstractCegarLoop]: === Iteration 108 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:42:54,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:42:54,747 INFO L85 PathProgramCache]: Analyzing trace with hash -1686671950, now seen corresponding path program 69 times [2021-11-20 23:42:54,747 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:42:54,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1205268420] [2021-11-20 23:42:54,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:42:54,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:42:54,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:55,107 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 223 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:55,107 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:42:55,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1205268420] [2021-11-20 23:42:55,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1205268420] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:42:55,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839527487] [2021-11-20 23:42:55,107 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:42:55,107 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:55,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:42:55,108 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:42:55,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Waiting until timeout for monitored process [2021-11-20 23:42:55,164 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:42:55,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:42:55,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-20 23:42:55,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:42:56,155 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 260 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:56,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:42:56,338 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 260 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:56,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [839527487] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:42:56,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1816060054] [2021-11-20 23:42:56,339 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:42:56,339 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:42:56,339 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:42:56,339 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:42:56,339 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:42:57,492 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:42:57,880 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:42:57,880 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:42:57,880 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 58 [2021-11-20 23:42:57,881 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767889670] [2021-11-20 23:42:57,881 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:42:57,881 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-20 23:42:57,881 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:42:57,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-20 23:42:57,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=646, Invalid=3776, Unknown=0, NotChecked=0, Total=4422 [2021-11-20 23:42:57,882 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 59 states, 59 states have (on average 2.0677966101694913) internal successors, (122), 58 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:00,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:43:00,069 INFO L93 Difference]: Finished difference Result 341 states and 361 transitions. [2021-11-20 23:43:00,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-20 23:43:00,070 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.0677966101694913) internal successors, (122), 58 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-20 23:43:00,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:43:00,070 INFO L225 Difference]: With dead ends: 341 [2021-11-20 23:43:00,070 INFO L226 Difference]: Without dead ends: 296 [2021-11-20 23:43:00,071 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5467 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2376, Invalid=13124, Unknown=0, NotChecked=0, Total=15500 [2021-11-20 23:43:00,071 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 76 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 354 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 463 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:43:00,071 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 202 Invalid, 463 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 354 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:43:00,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-11-20 23:43:00,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 75. [2021-11-20 23:43:00,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:00,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-20 23:43:00,332 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-20 23:43:00,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:43:00,333 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-20 23:43:00,333 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.0677966101694913) internal successors, (122), 58 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:00,333 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-20 23:43:00,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:43:00,334 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:43:00,334 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 9, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:43:00,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Forceful destruction successful, exit code 0 [2021-11-20 23:43:00,550 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable107 [2021-11-20 23:43:00,550 INFO L402 AbstractCegarLoop]: === Iteration 109 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:43:00,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:43:00,550 INFO L85 PathProgramCache]: Analyzing trace with hash 521637569, now seen corresponding path program 70 times [2021-11-20 23:43:00,550 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:43:00,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70053415] [2021-11-20 23:43:00,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:43:00,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:43:00,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:43:00,894 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 223 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:00,894 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:43:00,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70053415] [2021-11-20 23:43:00,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [70053415] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:43:00,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [454651423] [2021-11-20 23:43:00,895 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:43:00,895 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:00,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:43:00,896 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:43:00,897 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Waiting until timeout for monitored process [2021-11-20 23:43:00,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:43:00,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-20 23:43:00,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:43:01,924 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 260 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:01,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:43:02,074 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 260 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:02,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [454651423] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:43:02,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1689110412] [2021-11-20 23:43:02,075 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:43:02,075 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:43:02,076 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:43:02,076 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:43:02,076 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:43:03,201 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:43:03,662 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:43:03,662 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:43:03,662 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 57 [2021-11-20 23:43:03,662 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253392622] [2021-11-20 23:43:03,662 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:43:03,662 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-20 23:43:03,662 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:43:03,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-20 23:43:03,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=618, Invalid=3672, Unknown=0, NotChecked=0, Total=4290 [2021-11-20 23:43:03,663 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 58 states, 58 states have (on average 2.086206896551724) internal successors, (121), 57 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:06,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:43:06,592 INFO L93 Difference]: Finished difference Result 394 states and 415 transitions. [2021-11-20 23:43:06,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-20 23:43:06,592 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.086206896551724) internal successors, (121), 57 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-20 23:43:06,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:43:06,593 INFO L225 Difference]: With dead ends: 394 [2021-11-20 23:43:06,593 INFO L226 Difference]: Without dead ends: 349 [2021-11-20 23:43:06,594 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5929 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2581, Invalid=14189, Unknown=0, NotChecked=0, Total=16770 [2021-11-20 23:43:06,594 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 97 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 483 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 639 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 483 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:43:06,594 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 259 Invalid, 639 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [156 Valid, 483 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:43:06,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2021-11-20 23:43:06,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 75. [2021-11-20 23:43:06,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:06,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-20 23:43:06,879 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-20 23:43:06,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:43:06,880 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-20 23:43:06,880 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.086206896551724) internal successors, (121), 57 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:06,880 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-20 23:43:06,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:43:06,880 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:43:06,881 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 8, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:43:06,921 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Forceful destruction successful, exit code 0 [2021-11-20 23:43:07,094 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable108,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:07,094 INFO L402 AbstractCegarLoop]: === Iteration 110 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:43:07,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:43:07,094 INFO L85 PathProgramCache]: Analyzing trace with hash -1485336622, now seen corresponding path program 71 times [2021-11-20 23:43:07,094 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:43:07,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393090229] [2021-11-20 23:43:07,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:43:07,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:43:07,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:43:07,478 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 223 proven. 88 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:07,478 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:43:07,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393090229] [2021-11-20 23:43:07,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1393090229] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:43:07,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2071344948] [2021-11-20 23:43:07,479 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:43:07,479 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:07,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:43:07,480 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:43:07,495 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Waiting until timeout for monitored process [2021-11-20 23:43:07,550 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-20 23:43:07,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:43:07,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-20 23:43:07,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:43:08,510 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 260 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:08,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:43:08,665 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 260 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:08,666 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2071344948] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:43:08,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [166317268] [2021-11-20 23:43:08,666 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:43:08,666 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:43:08,667 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:43:08,667 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:43:08,667 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:43:09,677 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:43:10,106 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:43:10,106 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:43:10,107 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 56 [2021-11-20 23:43:10,107 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325763256] [2021-11-20 23:43:10,107 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:43:10,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-20 23:43:10,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:43:10,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-20 23:43:10,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=594, Invalid=3566, Unknown=0, NotChecked=0, Total=4160 [2021-11-20 23:43:10,108 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 57 states, 57 states have (on average 2.1052631578947367) internal successors, (120), 56 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:13,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:43:13,382 INFO L93 Difference]: Finished difference Result 446 states and 468 transitions. [2021-11-20 23:43:13,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-20 23:43:13,382 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.1052631578947367) internal successors, (120), 56 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-20 23:43:13,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:43:13,383 INFO L225 Difference]: With dead ends: 446 [2021-11-20 23:43:13,383 INFO L226 Difference]: Without dead ends: 401 [2021-11-20 23:43:13,384 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6212 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2710, Invalid=14846, Unknown=0, NotChecked=0, Total=17556 [2021-11-20 23:43:13,384 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 74 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 513 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 300 SdHoareTripleChecker+Invalid, 597 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 513 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:43:13,384 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 300 Invalid, 597 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 513 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:43:13,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2021-11-20 23:43:13,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 75. [2021-11-20 23:43:13,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:13,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-20 23:43:13,663 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-20 23:43:13,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:43:13,664 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-20 23:43:13,664 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 2.1052631578947367) internal successors, (120), 56 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:13,664 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-20 23:43:13,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:43:13,665 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:43:13,665 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:43:13,701 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Ended with exit code 0 [2021-11-20 23:43:13,878 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable109,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:13,878 INFO L402 AbstractCegarLoop]: === Iteration 111 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:43:13,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:43:13,878 INFO L85 PathProgramCache]: Analyzing trace with hash 528132257, now seen corresponding path program 72 times [2021-11-20 23:43:13,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:43:13,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526650128] [2021-11-20 23:43:13,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:43:13,879 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:43:13,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:43:14,237 INFO L134 CoverageAnalysis]: Checked inductivity of 309 backedges. 223 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:14,237 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:43:14,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526650128] [2021-11-20 23:43:14,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [526650128] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:43:14,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [84222824] [2021-11-20 23:43:14,237 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:43:14,237 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:14,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:43:14,238 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:43:14,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2021-11-20 23:43:14,284 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:43:14,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:43:14,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-20 23:43:14,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:43:15,051 INFO L134 CoverageAnalysis]: Checked inductivity of 309 backedges. 260 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:15,051 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:43:15,233 INFO L134 CoverageAnalysis]: Checked inductivity of 309 backedges. 260 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:15,233 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [84222824] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:43:15,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1667929017] [2021-11-20 23:43:15,234 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:43:15,234 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:43:15,234 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:43:15,235 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:43:15,235 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:43:16,183 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:43:16,569 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:43:16,570 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:43:16,570 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 55 [2021-11-20 23:43:16,570 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109498063] [2021-11-20 23:43:16,570 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:43:16,570 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-20 23:43:16,570 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:43:16,571 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-20 23:43:16,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=574, Invalid=3458, Unknown=0, NotChecked=0, Total=4032 [2021-11-20 23:43:16,571 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 56 states, 56 states have (on average 2.125) internal successors, (119), 55 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:20,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:43:20,064 INFO L93 Difference]: Finished difference Result 497 states and 520 transitions. [2021-11-20 23:43:20,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-11-20 23:43:20,065 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.125) internal successors, (119), 55 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-20 23:43:20,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:43:20,065 INFO L225 Difference]: With dead ends: 497 [2021-11-20 23:43:20,065 INFO L226 Difference]: Without dead ends: 452 [2021-11-20 23:43:20,067 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6295 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2754, Invalid=15068, Unknown=0, NotChecked=0, Total=17822 [2021-11-20 23:43:20,067 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 137 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 525 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 677 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 525 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:43:20,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 292 Invalid, 677 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 525 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:43:20,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 452 states. [2021-11-20 23:43:20,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 452 to 75. [2021-11-20 23:43:20,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:20,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-20 23:43:20,315 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-20 23:43:20,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:43:20,315 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-20 23:43:20,316 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.125) internal successors, (119), 55 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:20,316 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-20 23:43:20,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:43:20,316 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:43:20,317 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:43:20,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Forceful destruction successful, exit code 0 [2021-11-20 23:43:20,542 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110,110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:20,542 INFO L402 AbstractCegarLoop]: === Iteration 112 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:43:20,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:43:20,542 INFO L85 PathProgramCache]: Analyzing trace with hash 593082866, now seen corresponding path program 73 times [2021-11-20 23:43:20,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:43:20,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1230343877] [2021-11-20 23:43:20,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:43:20,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:43:20,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:43:20,861 INFO L134 CoverageAnalysis]: Checked inductivity of 309 backedges. 223 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:20,862 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:43:20,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1230343877] [2021-11-20 23:43:20,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1230343877] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:43:20,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [427162341] [2021-11-20 23:43:20,862 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:43:20,863 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:20,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:43:20,887 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:43:20,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Waiting until timeout for monitored process [2021-11-20 23:43:20,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:43:20,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-20 23:43:20,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:43:21,694 INFO L134 CoverageAnalysis]: Checked inductivity of 309 backedges. 260 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:21,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:43:21,839 INFO L134 CoverageAnalysis]: Checked inductivity of 309 backedges. 260 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:21,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [427162341] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:43:21,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [218965085] [2021-11-20 23:43:21,840 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:43:21,840 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:43:21,840 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:43:21,840 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:43:21,840 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:43:22,766 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:43:23,186 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:43:23,186 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:43:23,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 54 [2021-11-20 23:43:23,187 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536145637] [2021-11-20 23:43:23,187 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:43:23,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-20 23:43:23,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:43:23,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-20 23:43:23,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=558, Invalid=3348, Unknown=0, NotChecked=0, Total=3906 [2021-11-20 23:43:23,187 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 55 states, 55 states have (on average 2.1454545454545455) internal successors, (118), 54 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:26,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:43:26,892 INFO L93 Difference]: Finished difference Result 547 states and 571 transitions. [2021-11-20 23:43:26,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-11-20 23:43:26,892 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.1454545454545455) internal successors, (118), 54 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-20 23:43:26,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:43:26,893 INFO L225 Difference]: With dead ends: 547 [2021-11-20 23:43:26,893 INFO L226 Difference]: Without dead ends: 502 [2021-11-20 23:43:26,894 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6169 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2710, Invalid=14846, Unknown=0, NotChecked=0, Total=17556 [2021-11-20 23:43:26,895 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 100 mSDsluCounter, 330 mSDsCounter, 0 mSdLazyCounter, 577 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 344 SdHoareTripleChecker+Invalid, 695 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 577 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:43:26,895 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 344 Invalid, 695 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 577 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:43:26,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2021-11-20 23:43:27,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 75. [2021-11-20 23:43:27,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:27,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-20 23:43:27,185 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-20 23:43:27,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:43:27,185 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-20 23:43:27,186 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.1454545454545455) internal successors, (118), 54 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:27,186 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-20 23:43:27,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:43:27,186 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:43:27,186 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 8, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:43:27,212 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Ended with exit code 0 [2021-11-20 23:43:27,386 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable111,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:27,387 INFO L402 AbstractCegarLoop]: === Iteration 113 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:43:27,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:43:27,387 INFO L85 PathProgramCache]: Analyzing trace with hash -1483031935, now seen corresponding path program 74 times [2021-11-20 23:43:27,387 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:43:27,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [986849017] [2021-11-20 23:43:27,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:43:27,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:43:27,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:43:27,719 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 223 proven. 88 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:27,719 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:43:27,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [986849017] [2021-11-20 23:43:27,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [986849017] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:43:27,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1512089723] [2021-11-20 23:43:27,720 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:43:27,720 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:27,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:43:27,720 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:43:27,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Waiting until timeout for monitored process [2021-11-20 23:43:27,777 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-20 23:43:27,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:43:27,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-20 23:43:27,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:43:28,527 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 260 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:28,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:43:28,671 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 260 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:28,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1512089723] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:43:28,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [521206560] [2021-11-20 23:43:28,672 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:43:28,672 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:43:28,672 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:43:28,672 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:43:28,672 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:43:29,542 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:43:29,926 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:43:29,926 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:43:29,926 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 53 [2021-11-20 23:43:29,926 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598874394] [2021-11-20 23:43:29,926 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:43:29,926 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-20 23:43:29,926 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:43:29,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-20 23:43:29,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=546, Invalid=3236, Unknown=0, NotChecked=0, Total=3782 [2021-11-20 23:43:29,927 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 54 states, 54 states have (on average 2.1666666666666665) internal successors, (117), 53 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:33,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:43:33,625 INFO L93 Difference]: Finished difference Result 596 states and 621 transitions. [2021-11-20 23:43:33,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-11-20 23:43:33,625 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.1666666666666665) internal successors, (117), 53 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-20 23:43:33,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:43:33,626 INFO L225 Difference]: With dead ends: 596 [2021-11-20 23:43:33,626 INFO L226 Difference]: Without dead ends: 551 [2021-11-20 23:43:33,627 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5837 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2581, Invalid=14189, Unknown=0, NotChecked=0, Total=16770 [2021-11-20 23:43:33,627 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 130 mSDsluCounter, 305 mSDsCounter, 0 mSdLazyCounter, 520 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:43:33,627 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 318 Invalid, 643 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 520 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:43:33,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2021-11-20 23:43:33,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 75. [2021-11-20 23:43:33,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:33,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-20 23:43:33,908 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-20 23:43:33,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:43:33,908 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-20 23:43:33,908 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.1666666666666665) internal successors, (117), 53 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:33,908 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-20 23:43:33,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:43:33,909 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:43:33,909 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 9, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:43:33,934 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Ended with exit code 0 [2021-11-20 23:43:34,109 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable112 [2021-11-20 23:43:34,109 INFO L402 AbstractCegarLoop]: === Iteration 114 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:43:34,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:43:34,110 INFO L85 PathProgramCache]: Analyzing trace with hash 805301266, now seen corresponding path program 75 times [2021-11-20 23:43:34,110 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:43:34,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [858253633] [2021-11-20 23:43:34,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:43:34,110 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:43:34,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:43:34,456 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 223 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:34,456 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:43:34,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [858253633] [2021-11-20 23:43:34,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [858253633] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:43:34,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1220198641] [2021-11-20 23:43:34,456 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:43:34,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:34,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:43:34,457 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:43:34,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Waiting until timeout for monitored process [2021-11-20 23:43:34,502 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:43:34,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:43:34,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-20 23:43:34,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:43:35,315 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 260 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:35,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:43:35,498 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 260 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:35,498 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1220198641] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:43:35,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [64878369] [2021-11-20 23:43:35,500 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:43:35,500 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:43:35,500 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:43:35,501 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:43:35,501 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:43:36,539 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:43:36,909 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:43:36,909 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:43:36,909 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 52 [2021-11-20 23:43:36,909 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558191190] [2021-11-20 23:43:36,909 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:43:36,909 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-20 23:43:36,910 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:43:36,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-20 23:43:36,910 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=3122, Unknown=0, NotChecked=0, Total=3660 [2021-11-20 23:43:36,910 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 53 states, 53 states have (on average 2.188679245283019) internal successors, (116), 52 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:40,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:43:40,313 INFO L93 Difference]: Finished difference Result 644 states and 670 transitions. [2021-11-20 23:43:40,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-20 23:43:40,313 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.188679245283019) internal successors, (116), 52 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-20 23:43:40,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:43:40,314 INFO L225 Difference]: With dead ends: 644 [2021-11-20 23:43:40,314 INFO L226 Difference]: Without dead ends: 599 [2021-11-20 23:43:40,315 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5314 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2376, Invalid=13124, Unknown=0, NotChecked=0, Total=15500 [2021-11-20 23:43:40,315 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 166 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 428 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 273 SdHoareTripleChecker+Invalid, 571 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 428 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:43:40,315 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [166 Valid, 273 Invalid, 571 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 428 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:43:40,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 599 states. [2021-11-20 23:43:40,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 599 to 75. [2021-11-20 23:43:40,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:40,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-20 23:43:40,596 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-20 23:43:40,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:43:40,597 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-20 23:43:40,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.188679245283019) internal successors, (116), 52 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:40,597 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-20 23:43:40,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:43:40,598 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:43:40,598 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:43:40,623 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Forceful destruction successful, exit code 0 [2021-11-20 23:43:40,799 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable113 [2021-11-20 23:43:40,800 INFO L402 AbstractCegarLoop]: === Iteration 115 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:43:40,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:43:40,800 INFO L85 PathProgramCache]: Analyzing trace with hash -229260191, now seen corresponding path program 76 times [2021-11-20 23:43:40,800 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:43:40,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2070465340] [2021-11-20 23:43:40,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:43:40,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:43:40,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:43:41,140 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 223 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:41,141 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:43:41,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2070465340] [2021-11-20 23:43:41,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2070465340] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:43:41,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [40705459] [2021-11-20 23:43:41,141 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:43:41,141 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:41,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:43:41,142 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:43:41,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Waiting until timeout for monitored process [2021-11-20 23:43:41,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:43:41,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-20 23:43:41,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:43:41,979 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 260 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:41,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:43:42,167 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 260 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:42,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [40705459] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:43:42,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2087270047] [2021-11-20 23:43:42,168 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:43:42,168 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:43:42,168 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:43:42,168 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:43:42,168 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:43:43,143 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:43:43,559 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:43:43,559 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:43:43,560 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 51 [2021-11-20 23:43:43,560 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482363177] [2021-11-20 23:43:43,560 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:43:43,560 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-20 23:43:43,560 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:43:43,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-20 23:43:43,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=3006, Unknown=0, NotChecked=0, Total=3540 [2021-11-20 23:43:43,561 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 52 states, 52 states have (on average 2.2115384615384617) internal successors, (115), 51 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:47,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:43:47,160 INFO L93 Difference]: Finished difference Result 691 states and 718 transitions. [2021-11-20 23:43:47,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-20 23:43:47,160 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.2115384615384617) internal successors, (115), 51 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-20 23:43:47,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:43:47,161 INFO L225 Difference]: With dead ends: 691 [2021-11-20 23:43:47,161 INFO L226 Difference]: Without dead ends: 646 [2021-11-20 23:43:47,161 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4627 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2110, Invalid=11696, Unknown=0, NotChecked=0, Total=13806 [2021-11-20 23:43:47,162 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 275 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 384 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 275 SdHoareTripleChecker+Valid, 238 SdHoareTripleChecker+Invalid, 544 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:43:47,162 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [275 Valid, 238 Invalid, 544 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 384 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:43:47,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 646 states. [2021-11-20 23:43:47,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 646 to 75. [2021-11-20 23:43:47,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:47,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-20 23:43:47,442 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-20 23:43:47,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:43:47,442 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-20 23:43:47,443 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.2115384615384617) internal successors, (115), 51 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:47,443 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-20 23:43:47,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:43:47,443 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:43:47,443 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:43:47,483 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Forceful destruction successful, exit code 0 [2021-11-20 23:43:47,658 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable114,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:47,658 INFO L402 AbstractCegarLoop]: === Iteration 116 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:43:47,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:43:47,658 INFO L85 PathProgramCache]: Analyzing trace with hash -1093917134, now seen corresponding path program 77 times [2021-11-20 23:43:47,658 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:43:47,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579034306] [2021-11-20 23:43:47,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:43:47,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:43:47,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:43:48,067 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 223 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:48,067 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:43:48,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579034306] [2021-11-20 23:43:48,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1579034306] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:43:48,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [452215760] [2021-11-20 23:43:48,067 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:43:48,067 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:48,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:43:48,069 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:43:48,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2021-11-20 23:43:48,131 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-20 23:43:48,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:43:48,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-20 23:43:48,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:43:48,881 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 260 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:48,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:43:49,056 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 260 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:49,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [452215760] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:43:49,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1387948855] [2021-11-20 23:43:49,057 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:43:49,057 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:43:49,057 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:43:49,057 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:43:49,058 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:43:50,192 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:43:50,558 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:43:50,559 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:43:50,559 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 50 [2021-11-20 23:43:50,559 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519137177] [2021-11-20 23:43:50,559 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:43:50,559 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-20 23:43:50,559 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:43:50,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-20 23:43:50,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=2888, Unknown=0, NotChecked=0, Total=3422 [2021-11-20 23:43:50,560 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 51 states, 51 states have (on average 2.235294117647059) internal successors, (114), 50 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:54,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:43:54,289 INFO L93 Difference]: Finished difference Result 737 states and 765 transitions. [2021-11-20 23:43:54,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-20 23:43:54,289 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.235294117647059) internal successors, (114), 50 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-20 23:43:54,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:43:54,290 INFO L225 Difference]: With dead ends: 737 [2021-11-20 23:43:54,290 INFO L226 Difference]: Without dead ends: 692 [2021-11-20 23:43:54,290 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3815 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1804, Invalid=9968, Unknown=0, NotChecked=0, Total=11772 [2021-11-20 23:43:54,290 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 229 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 459 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 229 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 574 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 459 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:43:54,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [229 Valid, 279 Invalid, 574 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 459 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:43:54,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 692 states. [2021-11-20 23:43:54,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 692 to 75. [2021-11-20 23:43:54,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:54,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-20 23:43:54,540 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-20 23:43:54,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:43:54,541 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-20 23:43:54,541 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.235294117647059) internal successors, (114), 50 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:54,541 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-20 23:43:54,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:43:54,541 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:43:54,541 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:43:54,564 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Ended with exit code 0 [2021-11-20 23:43:54,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable115,115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:54,742 INFO L402 AbstractCegarLoop]: === Iteration 117 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:43:54,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:43:54,742 INFO L85 PathProgramCache]: Analyzing trace with hash 1510590017, now seen corresponding path program 78 times [2021-11-20 23:43:54,742 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:43:54,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [343122476] [2021-11-20 23:43:54,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:43:54,742 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:43:54,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:43:55,072 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 223 proven. 116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:55,072 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:43:55,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [343122476] [2021-11-20 23:43:55,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [343122476] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:43:55,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1492917039] [2021-11-20 23:43:55,072 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:43:55,072 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:55,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:43:55,073 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:43:55,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Waiting until timeout for monitored process [2021-11-20 23:43:55,124 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:43:55,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:43:55,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-20 23:43:55,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:43:55,770 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 260 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:55,770 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:43:55,915 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 260 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:55,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1492917039] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:43:55,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1761966260] [2021-11-20 23:43:55,916 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:43:55,916 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:43:55,916 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:43:55,916 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:43:55,917 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:43:57,038 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:43:57,441 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:43:57,441 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:43:57,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 49 [2021-11-20 23:43:57,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917894881] [2021-11-20 23:43:57,441 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:43:57,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-20 23:43:57,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:43:57,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-20 23:43:57,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=2768, Unknown=0, NotChecked=0, Total=3306 [2021-11-20 23:43:57,442 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 50 states, 50 states have (on average 2.26) internal successors, (113), 49 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:00,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:44:00,847 INFO L93 Difference]: Finished difference Result 782 states and 811 transitions. [2021-11-20 23:44:00,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-20 23:44:00,847 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.26) internal successors, (113), 49 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-20 23:44:00,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:44:00,849 INFO L225 Difference]: With dead ends: 782 [2021-11-20 23:44:00,849 INFO L226 Difference]: Without dead ends: 737 [2021-11-20 23:44:00,850 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2901 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1485, Invalid=8021, Unknown=0, NotChecked=0, Total=9506 [2021-11-20 23:44:00,850 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 246 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 417 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 246 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 496 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:44:00,851 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [246 Valid, 269 Invalid, 496 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 417 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:44:00,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 737 states. [2021-11-20 23:44:01,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 737 to 75. [2021-11-20 23:44:01,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:01,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2021-11-20 23:44:01,112 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2021-11-20 23:44:01,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:44:01,112 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2021-11-20 23:44:01,112 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.26) internal successors, (113), 49 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:01,112 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2021-11-20 23:44:01,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:44:01,112 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:44:01,112 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:44:01,135 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Ended with exit code 0 [2021-11-20 23:44:01,313 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable116 [2021-11-20 23:44:01,313 INFO L402 AbstractCegarLoop]: === Iteration 118 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:44:01,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:44:01,313 INFO L85 PathProgramCache]: Analyzing trace with hash -1314887598, now seen corresponding path program 13 times [2021-11-20 23:44:01,313 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:44:01,314 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [957130514] [2021-11-20 23:44:01,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:44:01,314 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:44:01,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:01,644 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 223 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:01,644 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:44:01,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [957130514] [2021-11-20 23:44:01,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [957130514] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:44:01,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1721135073] [2021-11-20 23:44:01,644 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:44:01,644 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:01,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:44:01,645 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:44:01,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Waiting until timeout for monitored process [2021-11-20 23:44:01,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:01,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-20 23:44:01,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:44:02,386 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:02,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:44:02,527 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:02,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1721135073] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:44:02,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1268155362] [2021-11-20 23:44:02,528 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:44:02,528 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:44:02,528 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:44:02,528 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:44:02,529 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:44:03,485 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:44:03,972 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:44:03,972 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:44:03,972 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 48 [2021-11-20 23:44:03,972 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532178122] [2021-11-20 23:44:03,972 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:44:03,972 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-20 23:44:03,973 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:44:03,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-20 23:44:03,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=545, Invalid=2647, Unknown=0, NotChecked=0, Total=3192 [2021-11-20 23:44:03,973 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 49 states, 49 states have (on average 2.2653061224489797) internal successors, (111), 48 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:07,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:44:07,509 INFO L93 Difference]: Finished difference Result 828 states and 859 transitions. [2021-11-20 23:44:07,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-20 23:44:07,509 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.2653061224489797) internal successors, (111), 48 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-20 23:44:07,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:44:07,510 INFO L225 Difference]: With dead ends: 828 [2021-11-20 23:44:07,510 INFO L226 Difference]: Without dead ends: 783 [2021-11-20 23:44:07,511 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2021 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1199, Invalid=5941, Unknown=0, NotChecked=0, Total=7140 [2021-11-20 23:44:07,511 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 342 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 342 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 371 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:44:07,511 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [342 Valid, 204 Invalid, 371 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 320 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:44:07,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 783 states. [2021-11-20 23:44:07,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 783 to 76. [2021-11-20 23:44:07,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 75 states have (on average 1.2266666666666666) internal successors, (92), 75 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:07,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 92 transitions. [2021-11-20 23:44:07,850 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 92 transitions. Word has length 60 [2021-11-20 23:44:07,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:44:07,850 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 92 transitions. [2021-11-20 23:44:07,851 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.2653061224489797) internal successors, (111), 48 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:07,851 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 92 transitions. [2021-11-20 23:44:07,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-20 23:44:07,851 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:44:07,851 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:44:07,877 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Forceful destruction successful, exit code 0 [2021-11-20 23:44:08,051 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable117,117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:08,052 INFO L402 AbstractCegarLoop]: === Iteration 119 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:44:08,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:44:08,052 INFO L85 PathProgramCache]: Analyzing trace with hash 173062277, now seen corresponding path program 26 times [2021-11-20 23:44:08,052 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:44:08,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017553550] [2021-11-20 23:44:08,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:44:08,052 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:44:08,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:08,223 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 105 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:08,223 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:44:08,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017553550] [2021-11-20 23:44:08,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1017553550] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:44:08,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [746834653] [2021-11-20 23:44:08,224 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:44:08,224 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:08,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:44:08,225 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:44:08,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Waiting until timeout for monitored process [2021-11-20 23:44:08,293 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-20 23:44:08,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:44:08,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-20 23:44:08,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:44:08,436 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 105 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:08,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:44:08,551 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 105 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:08,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [746834653] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:44:08,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [559686203] [2021-11-20 23:44:08,552 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:44:08,552 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:44:08,552 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:44:08,552 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:44:08,552 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:44:09,487 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:44:09,823 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:44:09,823 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:44:09,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 18 [2021-11-20 23:44:09,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281128387] [2021-11-20 23:44:09,824 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:44:09,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-20 23:44:09,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:44:09,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-20 23:44:09,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=528, Unknown=0, NotChecked=0, Total=702 [2021-11-20 23:44:09,824 INFO L87 Difference]: Start difference. First operand 76 states and 92 transitions. Second operand has 19 states, 19 states have (on average 3.3157894736842106) internal successors, (63), 18 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:10,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:44:10,475 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2021-11-20 23:44:10,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-20 23:44:10,475 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.3157894736842106) internal successors, (63), 18 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-20 23:44:10,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:44:10,475 INFO L225 Difference]: With dead ends: 87 [2021-11-20 23:44:10,475 INFO L226 Difference]: Without dead ends: 85 [2021-11-20 23:44:10,476 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 184 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 470 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=481, Invalid=1325, Unknown=0, NotChecked=0, Total=1806 [2021-11-20 23:44:10,476 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 64 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:44:10,476 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 30 Invalid, 372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:44:10,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-20 23:44:10,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 79. [2021-11-20 23:44:10,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.2179487179487178) internal successors, (95), 78 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:10,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 95 transitions. [2021-11-20 23:44:10,791 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 95 transitions. Word has length 61 [2021-11-20 23:44:10,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:44:10,791 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 95 transitions. [2021-11-20 23:44:10,791 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.3157894736842106) internal successors, (63), 18 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:10,791 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 95 transitions. [2021-11-20 23:44:10,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-20 23:44:10,792 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:44:10,792 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:44:10,817 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Forceful destruction successful, exit code 0 [2021-11-20 23:44:10,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable118 [2021-11-20 23:44:10,993 INFO L402 AbstractCegarLoop]: === Iteration 120 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:44:10,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:44:10,993 INFO L85 PathProgramCache]: Analyzing trace with hash 1742382027, now seen corresponding path program 27 times [2021-11-20 23:44:10,993 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:44:10,993 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [222573996] [2021-11-20 23:44:10,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:44:10,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:44:11,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:11,420 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 261 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:11,421 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:44:11,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [222573996] [2021-11-20 23:44:11,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [222573996] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:44:11,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499174282] [2021-11-20 23:44:11,421 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:44:11,421 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:11,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:44:11,422 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:44:11,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Waiting until timeout for monitored process [2021-11-20 23:44:11,483 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:44:11,483 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:44:11,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:44:11,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:44:12,611 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:12,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:44:12,776 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:12,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1499174282] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:44:12,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1392809821] [2021-11-20 23:44:12,777 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:44:12,777 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:44:12,777 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:44:12,777 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:44:12,777 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:44:13,776 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:44:14,305 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:44:14,305 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:44:14,306 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 65 [2021-11-20 23:44:14,306 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860870715] [2021-11-20 23:44:14,306 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:44:14,306 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-20 23:44:14,306 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:44:14,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-20 23:44:14,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=862, Invalid=4540, Unknown=0, NotChecked=0, Total=5402 [2021-11-20 23:44:14,307 INFO L87 Difference]: Start difference. First operand 79 states and 95 transitions. Second operand has 66 states, 66 states have (on average 2.0) internal successors, (132), 65 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:15,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:44:15,845 INFO L93 Difference]: Finished difference Result 188 states and 206 transitions. [2021-11-20 23:44:15,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-20 23:44:15,846 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.0) internal successors, (132), 65 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-20 23:44:15,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:44:15,846 INFO L225 Difference]: With dead ends: 188 [2021-11-20 23:44:15,846 INFO L226 Difference]: Without dead ends: 140 [2021-11-20 23:44:15,847 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3793 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1705, Invalid=9007, Unknown=0, NotChecked=0, Total=10712 [2021-11-20 23:44:15,847 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 27 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:44:15,847 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 251 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:44:15,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-20 23:44:16,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 80. [2021-11-20 23:44:16,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:16,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-20 23:44:16,183 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-20 23:44:16,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:44:16,183 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-20 23:44:16,184 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 2.0) internal successors, (132), 65 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:16,184 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-20 23:44:16,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-20 23:44:16,185 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:44:16,185 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:44:16,212 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Ended with exit code 0 [2021-11-20 23:44:16,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119,119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:16,390 INFO L402 AbstractCegarLoop]: === Iteration 121 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:44:16,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:44:16,390 INFO L85 PathProgramCache]: Analyzing trace with hash -1389034532, now seen corresponding path program 79 times [2021-11-20 23:44:16,390 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:44:16,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [512952617] [2021-11-20 23:44:16,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:44:16,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:44:16,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:16,816 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 261 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:16,816 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:44:16,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [512952617] [2021-11-20 23:44:16,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [512952617] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:44:16,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434062078] [2021-11-20 23:44:16,817 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:44:16,817 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:16,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:44:16,818 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:44:16,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Waiting until timeout for monitored process [2021-11-20 23:44:16,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:16,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:44:16,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:44:17,889 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 301 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:17,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:44:18,042 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 301 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:18,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [434062078] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:44:18,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2062051163] [2021-11-20 23:44:18,043 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:44:18,043 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:44:18,043 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:44:18,043 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:44:18,043 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:44:19,048 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:44:19,506 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:44:19,506 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:44:19,507 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 64 [2021-11-20 23:44:19,507 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913687252] [2021-11-20 23:44:19,507 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:44:19,507 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-20 23:44:19,507 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:44:19,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-20 23:44:19,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=807, Invalid=4449, Unknown=0, NotChecked=0, Total=5256 [2021-11-20 23:44:19,508 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 65 states, 65 states have (on average 2.0307692307692307) internal successors, (132), 64 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:21,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:44:21,570 INFO L93 Difference]: Finished difference Result 248 states and 267 transitions. [2021-11-20 23:44:21,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-20 23:44:21,571 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.0307692307692307) internal successors, (132), 64 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-20 23:44:21,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:44:21,571 INFO L225 Difference]: With dead ends: 248 [2021-11-20 23:44:21,571 INFO L226 Difference]: Without dead ends: 200 [2021-11-20 23:44:21,572 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4710 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2050, Invalid=11290, Unknown=0, NotChecked=0, Total=13340 [2021-11-20 23:44:21,572 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 47 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 354 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 428 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:44:21,572 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 187 Invalid, 428 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 354 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:44:21,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-11-20 23:44:21,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 80. [2021-11-20 23:44:21,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:21,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-20 23:44:21,901 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-20 23:44:21,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:44:21,901 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-20 23:44:21,901 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 2.0307692307692307) internal successors, (132), 64 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:21,901 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-20 23:44:21,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-20 23:44:21,901 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:44:21,901 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 12, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:44:21,923 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Forceful destruction successful, exit code 0 [2021-11-20 23:44:22,101 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable120,120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:22,102 INFO L402 AbstractCegarLoop]: === Iteration 122 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:44:22,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:44:22,102 INFO L85 PathProgramCache]: Analyzing trace with hash -1074405973, now seen corresponding path program 80 times [2021-11-20 23:44:22,102 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:44:22,102 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747065932] [2021-11-20 23:44:22,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:44:22,102 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:44:22,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:22,471 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 261 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:22,471 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:44:22,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747065932] [2021-11-20 23:44:22,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [747065932] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:44:22,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [613400353] [2021-11-20 23:44:22,471 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:44:22,471 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:22,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:44:22,472 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:44:22,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Waiting until timeout for monitored process [2021-11-20 23:44:22,537 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-20 23:44:22,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:44:22,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:44:22,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:44:23,558 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 301 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:23,558 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:44:23,772 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 301 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:23,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [613400353] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:44:23,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [858265695] [2021-11-20 23:44:23,773 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:44:23,773 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:44:23,773 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:44:23,773 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:44:23,773 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:44:24,858 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:44:25,289 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:44:25,289 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:44:25,289 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2021-11-20 23:44:25,289 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676525563] [2021-11-20 23:44:25,290 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:44:25,290 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-20 23:44:25,290 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:44:25,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-20 23:44:25,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=768, Invalid=4344, Unknown=0, NotChecked=0, Total=5112 [2021-11-20 23:44:25,291 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 64 states, 64 states have (on average 2.046875) internal successors, (131), 63 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:27,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:44:27,942 INFO L93 Difference]: Finished difference Result 307 states and 327 transitions. [2021-11-20 23:44:27,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-20 23:44:27,942 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.046875) internal successors, (131), 63 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-20 23:44:27,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:44:27,943 INFO L225 Difference]: With dead ends: 307 [2021-11-20 23:44:27,943 INFO L226 Difference]: Without dead ends: 259 [2021-11-20 23:44:27,945 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5575 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2415, Invalid=13335, Unknown=0, NotChecked=0, Total=15750 [2021-11-20 23:44:27,945 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 39 mSDsluCounter, 320 mSDsCounter, 0 mSdLazyCounter, 643 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 704 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 643 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:44:27,945 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 340 Invalid, 704 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 643 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:44:27,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2021-11-20 23:44:28,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 80. [2021-11-20 23:44:28,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:28,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-20 23:44:28,488 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-20 23:44:28,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:44:28,488 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-20 23:44:28,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.046875) internal successors, (131), 63 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:28,488 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-20 23:44:28,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-20 23:44:28,488 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:44:28,489 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 11, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:44:28,513 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Forceful destruction successful, exit code 0 [2021-11-20 23:44:28,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable121,121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:28,689 INFO L402 AbstractCegarLoop]: === Iteration 123 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:44:28,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:44:28,690 INFO L85 PathProgramCache]: Analyzing trace with hash -371520004, now seen corresponding path program 81 times [2021-11-20 23:44:28,690 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:44:28,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461369] [2021-11-20 23:44:28,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:44:28,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:44:28,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:29,085 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 261 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:29,085 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:44:29,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461369] [2021-11-20 23:44:29,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [461369] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:44:29,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2122162597] [2021-11-20 23:44:29,085 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:44:29,086 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:29,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:44:29,086 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:44:29,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Waiting until timeout for monitored process [2021-11-20 23:44:29,146 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:44:29,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:44:29,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:44:29,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:44:30,082 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 301 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:30,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:44:30,243 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 301 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:30,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2122162597] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:44:30,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [152535997] [2021-11-20 23:44:30,244 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:44:30,244 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:44:30,244 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:44:30,244 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:44:30,245 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:44:31,327 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:44:31,800 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:44:31,800 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:44:31,800 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2021-11-20 23:44:31,800 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719444622] [2021-11-20 23:44:31,800 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:44:31,800 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-20 23:44:31,800 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:44:31,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-20 23:44:31,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=733, Invalid=4237, Unknown=0, NotChecked=0, Total=4970 [2021-11-20 23:44:31,801 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 63 states, 63 states have (on average 2.0634920634920637) internal successors, (130), 62 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:35,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:44:35,042 INFO L93 Difference]: Finished difference Result 365 states and 386 transitions. [2021-11-20 23:44:35,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-20 23:44:35,042 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.0634920634920637) internal successors, (130), 62 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-20 23:44:35,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:44:35,043 INFO L225 Difference]: With dead ends: 365 [2021-11-20 23:44:35,043 INFO L226 Difference]: Without dead ends: 317 [2021-11-20 23:44:35,044 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6329 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2743, Invalid=15079, Unknown=0, NotChecked=0, Total=17822 [2021-11-20 23:44:35,044 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 65 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 619 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 704 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 619 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:44:35,044 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 345 Invalid, 704 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 619 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:44:35,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-11-20 23:44:35,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 80. [2021-11-20 23:44:35,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:35,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-20 23:44:35,428 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-20 23:44:35,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:44:35,429 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-20 23:44:35,429 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 2.0634920634920637) internal successors, (130), 62 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:35,429 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-20 23:44:35,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-20 23:44:35,429 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:44:35,430 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:44:35,460 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Ended with exit code 0 [2021-11-20 23:44:35,646 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable122,122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:35,646 INFO L402 AbstractCegarLoop]: === Iteration 124 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:44:35,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:44:35,646 INFO L85 PathProgramCache]: Analyzing trace with hash 1867911051, now seen corresponding path program 82 times [2021-11-20 23:44:35,646 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:44:35,647 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1380546869] [2021-11-20 23:44:35,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:44:35,647 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:44:35,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:36,056 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 261 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:36,057 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:44:36,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1380546869] [2021-11-20 23:44:36,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1380546869] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:44:36,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [328552789] [2021-11-20 23:44:36,057 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:44:36,057 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:36,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:44:36,058 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:44:36,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Waiting until timeout for monitored process [2021-11-20 23:44:36,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:36,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:44:36,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:44:37,033 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 301 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:37,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:44:37,185 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 301 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:37,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [328552789] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:44:37,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1273296393] [2021-11-20 23:44:37,194 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:44:37,194 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:44:37,194 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:44:37,194 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:44:37,194 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:44:38,120 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:44:38,529 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:44:38,529 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:44:38,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 61 [2021-11-20 23:44:38,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141551645] [2021-11-20 23:44:38,530 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:44:38,530 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-20 23:44:38,530 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:44:38,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-20 23:44:38,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=702, Invalid=4128, Unknown=0, NotChecked=0, Total=4830 [2021-11-20 23:44:38,531 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 62 states, 62 states have (on average 2.0806451612903225) internal successors, (129), 61 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:42,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:44:42,083 INFO L93 Difference]: Finished difference Result 422 states and 444 transitions. [2021-11-20 23:44:42,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-20 23:44:42,083 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.0806451612903225) internal successors, (129), 61 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-20 23:44:42,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:44:42,084 INFO L225 Difference]: With dead ends: 422 [2021-11-20 23:44:42,084 INFO L226 Difference]: Without dead ends: 374 [2021-11-20 23:44:42,085 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6936 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3010, Invalid=16450, Unknown=0, NotChecked=0, Total=19460 [2021-11-20 23:44:42,085 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 126 mSDsluCounter, 305 mSDsCounter, 0 mSdLazyCounter, 567 mSolverCounterSat, 182 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 749 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 182 IncrementalHoareTripleChecker+Valid, 567 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:44:42,085 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 324 Invalid, 749 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [182 Valid, 567 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:44:42,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2021-11-20 23:44:42,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 80. [2021-11-20 23:44:42,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:42,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-20 23:44:42,421 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-20 23:44:42,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:44:42,421 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-20 23:44:42,421 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.0806451612903225) internal successors, (129), 61 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:42,421 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-20 23:44:42,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-20 23:44:42,422 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:44:42,422 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 9, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:44:42,447 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Forceful destruction successful, exit code 0 [2021-11-20 23:44:42,630 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable123 [2021-11-20 23:44:42,630 INFO L402 AbstractCegarLoop]: === Iteration 125 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:44:42,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:44:42,630 INFO L85 PathProgramCache]: Analyzing trace with hash -692248548, now seen corresponding path program 83 times [2021-11-20 23:44:42,631 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:44:42,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [279325321] [2021-11-20 23:44:42,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:44:42,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:44:42,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:42,972 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 261 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:42,972 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:44:42,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [279325321] [2021-11-20 23:44:42,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [279325321] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:44:42,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1323536448] [2021-11-20 23:44:42,973 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:44:42,973 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:42,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:44:42,973 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:44:42,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Waiting until timeout for monitored process [2021-11-20 23:44:43,037 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-20 23:44:43,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:44:43,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:44:43,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:44:43,990 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 301 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:43,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:44:44,178 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 301 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:44,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1323536448] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:44:44,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [440445064] [2021-11-20 23:44:44,179 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:44:44,179 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:44:44,179 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:44:44,179 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:44:44,179 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:44:45,113 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:44:45,532 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:44:45,532 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:44:45,532 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 60 [2021-11-20 23:44:45,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511454855] [2021-11-20 23:44:45,532 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:44:45,533 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-20 23:44:45,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:44:45,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-20 23:44:45,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=675, Invalid=4017, Unknown=0, NotChecked=0, Total=4692 [2021-11-20 23:44:45,533 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 61 states, 61 states have (on average 2.098360655737705) internal successors, (128), 60 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:49,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:44:49,610 INFO L93 Difference]: Finished difference Result 478 states and 501 transitions. [2021-11-20 23:44:49,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-11-20 23:44:49,610 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.098360655737705) internal successors, (128), 60 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-20 23:44:49,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:44:49,611 INFO L225 Difference]: With dead ends: 478 [2021-11-20 23:44:49,611 INFO L226 Difference]: Without dead ends: 430 [2021-11-20 23:44:49,612 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7357 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3198, Invalid=17394, Unknown=0, NotChecked=0, Total=20592 [2021-11-20 23:44:49,612 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 149 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 209 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 602 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 209 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:44:49,612 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 226 Invalid, 602 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [209 Valid, 393 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:44:49,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2021-11-20 23:44:49,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 80. [2021-11-20 23:44:49,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:49,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-20 23:44:49,972 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-20 23:44:49,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:44:49,972 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-20 23:44:49,972 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.098360655737705) internal successors, (128), 60 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:49,972 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-20 23:44:49,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-20 23:44:49,973 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:44:49,973 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 8, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:44:50,002 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Ended with exit code 0 [2021-11-20 23:44:50,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable124 [2021-11-20 23:44:50,186 INFO L402 AbstractCegarLoop]: === Iteration 126 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:44:50,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:44:50,186 INFO L85 PathProgramCache]: Analyzing trace with hash -220645013, now seen corresponding path program 84 times [2021-11-20 23:44:50,186 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:44:50,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1371605687] [2021-11-20 23:44:50,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:44:50,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:44:50,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:50,532 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 261 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:50,533 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:44:50,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1371605687] [2021-11-20 23:44:50,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1371605687] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:44:50,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1259027067] [2021-11-20 23:44:50,533 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:44:50,533 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:50,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:44:50,534 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:44:50,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Waiting until timeout for monitored process [2021-11-20 23:44:50,586 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:44:50,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:44:50,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:44:50,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:44:51,527 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 301 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:51,527 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:44:51,680 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 301 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:51,681 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1259027067] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:44:51,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [297961641] [2021-11-20 23:44:51,681 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:44:51,681 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:44:51,682 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:44:51,682 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:44:51,682 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:44:52,658 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:44:53,056 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:44:53,056 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:44:53,056 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 59 [2021-11-20 23:44:53,056 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842562414] [2021-11-20 23:44:53,056 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:44:53,056 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-20 23:44:53,056 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:44:53,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-20 23:44:53,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=652, Invalid=3904, Unknown=0, NotChecked=0, Total=4556 [2021-11-20 23:44:53,057 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 60 states, 60 states have (on average 2.1166666666666667) internal successors, (127), 59 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:56,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:44:56,961 INFO L93 Difference]: Finished difference Result 533 states and 557 transitions. [2021-11-20 23:44:56,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-11-20 23:44:56,962 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.1166666666666667) internal successors, (127), 59 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-20 23:44:56,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:44:56,962 INFO L225 Difference]: With dead ends: 533 [2021-11-20 23:44:56,962 INFO L226 Difference]: Without dead ends: 485 [2021-11-20 23:44:56,963 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7565 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3295, Invalid=17875, Unknown=0, NotChecked=0, Total=21170 [2021-11-20 23:44:56,963 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 105 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 479 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:44:56,964 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 267 Invalid, 624 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 479 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:44:56,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 485 states. [2021-11-20 23:44:57,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 485 to 80. [2021-11-20 23:44:57,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:57,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-20 23:44:57,302 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-20 23:44:57,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:44:57,303 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-20 23:44:57,303 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 2.1166666666666667) internal successors, (127), 59 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:57,303 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-20 23:44:57,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-20 23:44:57,303 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:44:57,303 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:44:57,323 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Ended with exit code 0 [2021-11-20 23:44:57,503 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable125,125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:57,504 INFO L402 AbstractCegarLoop]: === Iteration 127 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:44:57,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:44:57,504 INFO L85 PathProgramCache]: Analyzing trace with hash -482526660, now seen corresponding path program 85 times [2021-11-20 23:44:57,504 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:44:57,504 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1478894385] [2021-11-20 23:44:57,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:44:57,504 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:44:57,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:57,819 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 261 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:57,819 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:44:57,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1478894385] [2021-11-20 23:44:57,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1478894385] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:44:57,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1166221619] [2021-11-20 23:44:57,820 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:44:57,820 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:57,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:44:57,820 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:44:57,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Waiting until timeout for monitored process [2021-11-20 23:44:57,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:57,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:44:57,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:44:58,670 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 301 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:58,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:44:58,819 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 301 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:44:58,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1166221619] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:44:58,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1148208996] [2021-11-20 23:44:58,821 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:44:58,821 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:44:58,821 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:44:58,821 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:44:58,821 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:44:59,673 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:45:00,054 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:45:00,054 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:45:00,054 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 58 [2021-11-20 23:45:00,054 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937147855] [2021-11-20 23:45:00,054 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:45:00,054 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-20 23:45:00,054 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:00,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-20 23:45:00,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=633, Invalid=3789, Unknown=0, NotChecked=0, Total=4422 [2021-11-20 23:45:00,055 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 59 states, 59 states have (on average 2.135593220338983) internal successors, (126), 58 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:04,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:04,008 INFO L93 Difference]: Finished difference Result 587 states and 612 transitions. [2021-11-20 23:45:04,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-11-20 23:45:04,008 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.135593220338983) internal successors, (126), 58 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-20 23:45:04,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:04,009 INFO L225 Difference]: With dead ends: 587 [2021-11-20 23:45:04,009 INFO L226 Difference]: Without dead ends: 539 [2021-11-20 23:45:04,010 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7545 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3295, Invalid=17875, Unknown=0, NotChecked=0, Total=21170 [2021-11-20 23:45:04,010 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 106 mSDsluCounter, 279 mSDsCounter, 0 mSdLazyCounter, 486 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 644 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 486 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:04,010 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 294 Invalid, 644 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 486 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:45:04,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 539 states. [2021-11-20 23:45:04,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 539 to 80. [2021-11-20 23:45:04,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:04,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-20 23:45:04,308 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-20 23:45:04,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:04,308 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-20 23:45:04,308 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.135593220338983) internal successors, (126), 58 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:04,308 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-20 23:45:04,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-20 23:45:04,309 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:04,309 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 8, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:04,330 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Ended with exit code 0 [2021-11-20 23:45:04,514 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable126,126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:04,514 INFO L402 AbstractCegarLoop]: === Iteration 128 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:04,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:04,514 INFO L85 PathProgramCache]: Analyzing trace with hash 1725782859, now seen corresponding path program 86 times [2021-11-20 23:45:04,514 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:04,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1695991096] [2021-11-20 23:45:04,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:04,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:04,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:04,851 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 261 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:04,851 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:04,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1695991096] [2021-11-20 23:45:04,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1695991096] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:45:04,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [889567294] [2021-11-20 23:45:04,852 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:45:04,852 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:04,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:04,853 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:45:04,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Waiting until timeout for monitored process [2021-11-20 23:45:04,909 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-20 23:45:04,909 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:45:04,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:45:04,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:45:05,823 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 301 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:05,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:45:06,009 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 301 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:06,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [889567294] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:45:06,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [128872003] [2021-11-20 23:45:06,010 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:45:06,010 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:45:06,010 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:45:06,010 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:45:06,010 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:45:06,873 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:45:07,254 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:45:07,254 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:45:07,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 57 [2021-11-20 23:45:07,254 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141954102] [2021-11-20 23:45:07,254 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:45:07,255 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-20 23:45:07,255 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:07,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-20 23:45:07,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=618, Invalid=3672, Unknown=0, NotChecked=0, Total=4290 [2021-11-20 23:45:07,256 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 58 states, 58 states have (on average 2.1551724137931036) internal successors, (125), 57 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:11,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:11,621 INFO L93 Difference]: Finished difference Result 640 states and 666 transitions. [2021-11-20 23:45:11,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-11-20 23:45:11,622 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.1551724137931036) internal successors, (125), 57 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-20 23:45:11,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:11,623 INFO L225 Difference]: With dead ends: 640 [2021-11-20 23:45:11,623 INFO L226 Difference]: Without dead ends: 592 [2021-11-20 23:45:11,625 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7294 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3198, Invalid=17394, Unknown=0, NotChecked=0, Total=20592 [2021-11-20 23:45:11,625 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 127 mSDsluCounter, 299 mSDsCounter, 0 mSdLazyCounter, 534 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 658 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 534 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:11,625 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 313 Invalid, 658 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 534 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:45:11,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2021-11-20 23:45:11,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 80. [2021-11-20 23:45:11,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:11,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-20 23:45:11,962 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-20 23:45:11,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:11,962 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-20 23:45:11,962 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.1551724137931036) internal successors, (125), 57 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:11,962 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-20 23:45:11,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-20 23:45:11,963 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:11,963 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 9, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:11,983 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Forceful destruction successful, exit code 0 [2021-11-20 23:45:12,164 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable127 [2021-11-20 23:45:12,165 INFO L402 AbstractCegarLoop]: === Iteration 129 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:12,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:12,166 INFO L85 PathProgramCache]: Analyzing trace with hash -281191332, now seen corresponding path program 87 times [2021-11-20 23:45:12,166 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:12,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008300033] [2021-11-20 23:45:12,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:12,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:12,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:12,488 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 261 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:12,489 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:12,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008300033] [2021-11-20 23:45:12,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1008300033] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:45:12,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [706610719] [2021-11-20 23:45:12,489 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:45:12,489 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:12,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:12,492 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:45:12,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Waiting until timeout for monitored process [2021-11-20 23:45:12,547 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:45:12,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:45:12,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:45:12,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:45:13,303 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 301 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:13,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:45:13,478 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 301 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:13,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [706610719] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:45:13,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [176216652] [2021-11-20 23:45:13,480 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:45:13,480 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:45:13,480 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:45:13,480 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:45:13,480 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:45:14,457 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:45:14,844 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:45:14,844 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:45:14,844 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 56 [2021-11-20 23:45:14,844 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458519740] [2021-11-20 23:45:14,844 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:45:14,845 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-20 23:45:14,845 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:14,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-20 23:45:14,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=607, Invalid=3553, Unknown=0, NotChecked=0, Total=4160 [2021-11-20 23:45:14,845 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 57 states, 57 states have (on average 2.175438596491228) internal successors, (124), 56 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:19,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:19,356 INFO L93 Difference]: Finished difference Result 692 states and 719 transitions. [2021-11-20 23:45:19,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-11-20 23:45:19,356 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.175438596491228) internal successors, (124), 56 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-20 23:45:19,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:19,357 INFO L225 Difference]: With dead ends: 692 [2021-11-20 23:45:19,357 INFO L226 Difference]: Without dead ends: 644 [2021-11-20 23:45:19,357 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6821 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3010, Invalid=16450, Unknown=0, NotChecked=0, Total=19460 [2021-11-20 23:45:19,358 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 156 mSDsluCounter, 301 mSDsCounter, 0 mSdLazyCounter, 517 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 642 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:19,358 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [156 Valid, 314 Invalid, 642 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 517 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:45:19,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 644 states. [2021-11-20 23:45:19,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 644 to 80. [2021-11-20 23:45:19,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:19,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-20 23:45:19,685 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-20 23:45:19,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:19,685 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-20 23:45:19,685 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 2.175438596491228) internal successors, (124), 56 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:19,685 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-20 23:45:19,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-20 23:45:19,686 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:19,686 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:19,706 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Ended with exit code 0 [2021-11-20 23:45:19,890 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable128,128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:19,890 INFO L402 AbstractCegarLoop]: === Iteration 130 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:19,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:19,890 INFO L85 PathProgramCache]: Analyzing trace with hash 1732277547, now seen corresponding path program 88 times [2021-11-20 23:45:19,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:19,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864942186] [2021-11-20 23:45:19,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:19,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:19,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:20,209 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 261 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:20,209 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:20,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864942186] [2021-11-20 23:45:20,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1864942186] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:45:20,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [34594659] [2021-11-20 23:45:20,209 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:45:20,209 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:20,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:20,210 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:45:20,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (129)] Waiting until timeout for monitored process [2021-11-20 23:45:20,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:20,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:45:20,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:45:20,989 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 301 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:20,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:45:21,140 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 301 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:21,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [34594659] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:45:21,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1250851725] [2021-11-20 23:45:21,142 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:45:21,142 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:45:21,142 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:45:21,142 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:45:21,142 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:45:22,050 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:45:22,442 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:45:22,442 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:45:22,442 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 55 [2021-11-20 23:45:22,443 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792537413] [2021-11-20 23:45:22,443 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:45:22,443 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-20 23:45:22,443 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:22,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-20 23:45:22,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=600, Invalid=3432, Unknown=0, NotChecked=0, Total=4032 [2021-11-20 23:45:22,444 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 56 states, 56 states have (on average 2.1964285714285716) internal successors, (123), 55 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:26,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:26,751 INFO L93 Difference]: Finished difference Result 743 states and 771 transitions. [2021-11-20 23:45:26,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-11-20 23:45:26,751 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.1964285714285716) internal successors, (123), 55 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-20 23:45:26,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:26,752 INFO L225 Difference]: With dead ends: 743 [2021-11-20 23:45:26,752 INFO L226 Difference]: Without dead ends: 695 [2021-11-20 23:45:26,753 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6147 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2743, Invalid=15079, Unknown=0, NotChecked=0, Total=17822 [2021-11-20 23:45:26,753 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 195 mSDsluCounter, 270 mSDsCounter, 0 mSdLazyCounter, 476 mSolverCounterSat, 142 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 282 SdHoareTripleChecker+Invalid, 618 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 142 IncrementalHoareTripleChecker+Valid, 476 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:26,753 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [195 Valid, 282 Invalid, 618 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [142 Valid, 476 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:45:26,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2021-11-20 23:45:27,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 80. [2021-11-20 23:45:27,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:27,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-20 23:45:27,122 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-20 23:45:27,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:27,122 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-20 23:45:27,122 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.1964285714285716) internal successors, (123), 55 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:27,122 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-20 23:45:27,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-20 23:45:27,123 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:27,123 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 11, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:27,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (129)] Forceful destruction successful, exit code 0 [2021-11-20 23:45:27,323 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable129 [2021-11-20 23:45:27,324 INFO L402 AbstractCegarLoop]: === Iteration 131 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:27,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:27,324 INFO L85 PathProgramCache]: Analyzing trace with hash 1797228156, now seen corresponding path program 89 times [2021-11-20 23:45:27,324 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:27,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [211107103] [2021-11-20 23:45:27,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:27,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:27,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:27,655 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 261 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:27,655 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:27,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [211107103] [2021-11-20 23:45:27,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [211107103] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:45:27,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [633660446] [2021-11-20 23:45:27,655 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:45:27,655 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:27,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:27,656 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:45:27,657 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (130)] Waiting until timeout for monitored process [2021-11-20 23:45:27,714 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-20 23:45:27,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:45:27,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:45:27,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:45:28,470 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 301 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:28,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:45:28,629 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 301 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:28,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [633660446] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:45:28,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1391393643] [2021-11-20 23:45:28,630 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:45:28,630 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:45:28,630 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:45:28,630 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:45:28,631 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:45:29,649 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:45:30,026 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:45:30,026 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:45:30,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 54 [2021-11-20 23:45:30,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476299989] [2021-11-20 23:45:30,027 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:45:30,027 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-20 23:45:30,027 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:30,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-20 23:45:30,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=3309, Unknown=0, NotChecked=0, Total=3906 [2021-11-20 23:45:30,028 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 55 states, 55 states have (on average 2.2181818181818183) internal successors, (122), 54 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:34,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:34,345 INFO L93 Difference]: Finished difference Result 793 states and 822 transitions. [2021-11-20 23:45:34,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-20 23:45:34,345 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.2181818181818183) internal successors, (122), 54 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-20 23:45:34,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:34,346 INFO L225 Difference]: With dead ends: 793 [2021-11-20 23:45:34,346 INFO L226 Difference]: Without dead ends: 745 [2021-11-20 23:45:34,347 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5305 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2415, Invalid=13335, Unknown=0, NotChecked=0, Total=15750 [2021-11-20 23:45:34,347 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 383 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 218 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 383 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 662 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 218 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:34,347 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [383 Valid, 278 Invalid, 662 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [218 Valid, 444 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:45:34,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 745 states. [2021-11-20 23:45:34,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 745 to 80. [2021-11-20 23:45:34,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:34,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-20 23:45:34,694 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-20 23:45:34,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:34,694 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-20 23:45:34,694 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.2181818181818183) internal successors, (122), 54 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:34,694 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-20 23:45:34,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-20 23:45:34,695 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:34,695 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 12, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:34,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (130)] Forceful destruction successful, exit code 0 [2021-11-20 23:45:34,910 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable130,130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:34,910 INFO L402 AbstractCegarLoop]: === Iteration 132 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:34,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:34,910 INFO L85 PathProgramCache]: Analyzing trace with hash -278886645, now seen corresponding path program 90 times [2021-11-20 23:45:34,910 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:34,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [498972376] [2021-11-20 23:45:34,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:34,910 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:34,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:35,258 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 261 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:35,259 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:35,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [498972376] [2021-11-20 23:45:35,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [498972376] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:45:35,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1103621133] [2021-11-20 23:45:35,259 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:45:35,259 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:35,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:35,260 INFO L229 MonitoredProcess]: Starting monitored process 131 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:45:35,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Waiting until timeout for monitored process [2021-11-20 23:45:35,306 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:45:35,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:45:35,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:45:35,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:45:36,007 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 301 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:36,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:45:36,162 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 301 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:36,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1103621133] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:45:36,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1708598497] [2021-11-20 23:45:36,163 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:45:36,163 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:45:36,163 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:45:36,163 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:45:36,163 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:45:37,065 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:45:37,441 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:45:37,441 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:45:37,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 53 [2021-11-20 23:45:37,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115955048] [2021-11-20 23:45:37,441 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:45:37,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-20 23:45:37,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:37,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-20 23:45:37,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=598, Invalid=3184, Unknown=0, NotChecked=0, Total=3782 [2021-11-20 23:45:37,442 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 54 states, 54 states have (on average 2.240740740740741) internal successors, (121), 53 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:41,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:41,810 INFO L93 Difference]: Finished difference Result 842 states and 872 transitions. [2021-11-20 23:45:41,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-20 23:45:41,811 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.240740740740741) internal successors, (121), 53 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-20 23:45:41,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:41,812 INFO L225 Difference]: With dead ends: 842 [2021-11-20 23:45:41,812 INFO L226 Difference]: Without dead ends: 794 [2021-11-20 23:45:41,812 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4340 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2050, Invalid=11290, Unknown=0, NotChecked=0, Total=13340 [2021-11-20 23:45:41,813 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 259 mSDsluCounter, 278 mSDsCounter, 0 mSdLazyCounter, 460 mSolverCounterSat, 113 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 113 IncrementalHoareTripleChecker+Valid, 460 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:41,813 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [259 Valid, 289 Invalid, 573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [113 Valid, 460 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:45:41,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 794 states. [2021-11-20 23:45:42,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 794 to 80. [2021-11-20 23:45:42,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:42,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-20 23:45:42,150 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-20 23:45:42,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:42,151 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-20 23:45:42,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.240740740740741) internal successors, (121), 53 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:42,151 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-20 23:45:42,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-20 23:45:42,151 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:42,151 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:42,171 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Forceful destruction successful, exit code 0 [2021-11-20 23:45:42,351 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable131,131 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:42,352 INFO L402 AbstractCegarLoop]: === Iteration 133 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:42,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:42,352 INFO L85 PathProgramCache]: Analyzing trace with hash 2009446556, now seen corresponding path program 91 times [2021-11-20 23:45:42,352 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:42,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1722007724] [2021-11-20 23:45:42,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:42,352 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:42,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:42,696 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 261 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:42,696 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:42,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1722007724] [2021-11-20 23:45:42,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1722007724] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:45:42,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [943920353] [2021-11-20 23:45:42,696 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:45:42,697 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:42,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:42,697 INFO L229 MonitoredProcess]: Starting monitored process 132 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:45:42,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (132)] Waiting until timeout for monitored process [2021-11-20 23:45:42,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:42,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:45:42,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:45:43,426 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 301 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:43,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:45:43,579 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 301 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:43,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [943920353] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:45:43,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1463726413] [2021-11-20 23:45:43,580 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:45:43,580 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:45:43,580 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:45:43,580 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:45:43,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:45:44,469 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:45:44,843 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:45:44,843 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:45:44,844 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 52 [2021-11-20 23:45:44,844 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145638021] [2021-11-20 23:45:44,844 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:45:44,844 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-20 23:45:44,844 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:44,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-20 23:45:44,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=603, Invalid=3057, Unknown=0, NotChecked=0, Total=3660 [2021-11-20 23:45:44,845 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 53 states, 53 states have (on average 2.2641509433962264) internal successors, (120), 52 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:49,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:49,191 INFO L93 Difference]: Finished difference Result 890 states and 921 transitions. [2021-11-20 23:45:49,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-20 23:45:49,191 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.2641509433962264) internal successors, (120), 52 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-20 23:45:49,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:49,192 INFO L225 Difference]: With dead ends: 890 [2021-11-20 23:45:49,192 INFO L226 Difference]: Without dead ends: 842 [2021-11-20 23:45:49,192 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 163 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3279 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1678, Invalid=9034, Unknown=0, NotChecked=0, Total=10712 [2021-11-20 23:45:49,193 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 302 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 302 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:49,193 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [302 Valid, 299 Invalid, 558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:45:49,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 842 states. [2021-11-20 23:45:49,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 842 to 80. [2021-11-20 23:45:49,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:49,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2021-11-20 23:45:49,518 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2021-11-20 23:45:49,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:49,518 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2021-11-20 23:45:49,518 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.2641509433962264) internal successors, (120), 52 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:49,518 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2021-11-20 23:45:49,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-20 23:45:49,518 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:49,518 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:49,538 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (132)] Ended with exit code 0 [2021-11-20 23:45:49,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable132,132 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:49,719 INFO L402 AbstractCegarLoop]: === Iteration 134 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:49,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:49,719 INFO L85 PathProgramCache]: Analyzing trace with hash 974885099, now seen corresponding path program 14 times [2021-11-20 23:45:49,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:49,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607219775] [2021-11-20 23:45:49,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:49,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:49,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:50,043 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 261 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:50,044 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:50,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607219775] [2021-11-20 23:45:50,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [607219775] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:45:50,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [904206889] [2021-11-20 23:45:50,044 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:45:50,044 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:50,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:50,045 INFO L229 MonitoredProcess]: Starting monitored process 133 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:45:50,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (133)] Waiting until timeout for monitored process [2021-11-20 23:45:50,100 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-20 23:45:50,100 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:45:50,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:45:50,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:45:50,775 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:50,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:45:50,926 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:50,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [904206889] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:45:50,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [686411849] [2021-11-20 23:45:50,927 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:45:50,927 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:45:50,928 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:45:50,928 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:45:50,928 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:45:51,696 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:45:52,102 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:45:52,102 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:45:52,102 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 51 [2021-11-20 23:45:52,102 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185774346] [2021-11-20 23:45:52,102 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:45:52,103 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-20 23:45:52,103 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:52,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-20 23:45:52,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=611, Invalid=2929, Unknown=0, NotChecked=0, Total=3540 [2021-11-20 23:45:52,103 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 52 states, 52 states have (on average 2.269230769230769) internal successors, (118), 51 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:56,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:56,317 INFO L93 Difference]: Finished difference Result 939 states and 972 transitions. [2021-11-20 23:45:56,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-20 23:45:56,318 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.269230769230769) internal successors, (118), 51 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-20 23:45:56,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:56,319 INFO L225 Difference]: With dead ends: 939 [2021-11-20 23:45:56,319 INFO L226 Difference]: Without dead ends: 891 [2021-11-20 23:45:56,319 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2270 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1349, Invalid=6661, Unknown=0, NotChecked=0, Total=8010 [2021-11-20 23:45:56,319 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 358 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 394 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 358 SdHoareTripleChecker+Valid, 238 SdHoareTripleChecker+Invalid, 452 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:56,320 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [358 Valid, 238 Invalid, 452 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 394 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:45:56,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 891 states. [2021-11-20 23:45:56,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 891 to 81. [2021-11-20 23:45:56,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 80 states have (on average 1.225) internal successors, (98), 80 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:56,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 98 transitions. [2021-11-20 23:45:56,654 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 98 transitions. Word has length 64 [2021-11-20 23:45:56,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:56,654 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 98 transitions. [2021-11-20 23:45:56,654 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.269230769230769) internal successors, (118), 51 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:56,654 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 98 transitions. [2021-11-20 23:45:56,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-20 23:45:56,654 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:56,655 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:56,674 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (133)] Ended with exit code 0 [2021-11-20 23:45:56,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable133,133 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:56,855 INFO L402 AbstractCegarLoop]: === Iteration 135 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:56,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:56,856 INFO L85 PathProgramCache]: Analyzing trace with hash 1654437711, now seen corresponding path program 28 times [2021-11-20 23:45:56,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:56,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1327264215] [2021-11-20 23:45:56,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:56,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:56,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:57,002 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 120 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:57,002 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:57,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1327264215] [2021-11-20 23:45:57,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1327264215] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:45:57,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161168592] [2021-11-20 23:45:57,003 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:45:57,003 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:57,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:57,003 INFO L229 MonitoredProcess]: Starting monitored process 134 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:45:57,004 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Waiting until timeout for monitored process [2021-11-20 23:45:57,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:57,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-20 23:45:57,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:45:57,169 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 120 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:57,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:45:57,291 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 120 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:45:57,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1161168592] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:45:57,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [148700651] [2021-11-20 23:45:57,292 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:45:57,292 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:45:57,292 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:45:57,293 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:45:57,293 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:45:58,178 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:45:58,483 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:45:58,483 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:45:58,483 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 19 [2021-11-20 23:45:58,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982341021] [2021-11-20 23:45:58,484 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:45:58,484 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-20 23:45:58,484 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:58,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-20 23:45:58,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=565, Unknown=0, NotChecked=0, Total=756 [2021-11-20 23:45:58,484 INFO L87 Difference]: Start difference. First operand 81 states and 98 transitions. Second operand has 20 states, 20 states have (on average 3.35) internal successors, (67), 19 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:59,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:59,152 INFO L93 Difference]: Finished difference Result 92 states and 109 transitions. [2021-11-20 23:45:59,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-20 23:45:59,152 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.35) internal successors, (67), 19 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-20 23:45:59,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:59,153 INFO L225 Difference]: With dead ends: 92 [2021-11-20 23:45:59,153 INFO L226 Difference]: Without dead ends: 90 [2021-11-20 23:45:59,153 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 197 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=534, Invalid=1446, Unknown=0, NotChecked=0, Total=1980 [2021-11-20 23:45:59,153 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 68 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 317 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 396 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:59,153 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 26 Invalid, 396 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 317 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:45:59,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-20 23:45:59,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 84. [2021-11-20 23:45:59,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.216867469879518) internal successors, (101), 83 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:59,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 101 transitions. [2021-11-20 23:45:59,488 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 101 transitions. Word has length 65 [2021-11-20 23:45:59,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:59,488 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 101 transitions. [2021-11-20 23:45:59,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.35) internal successors, (67), 19 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:59,488 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 101 transitions. [2021-11-20 23:45:59,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:45:59,488 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:59,489 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:59,510 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Forceful destruction successful, exit code 0 [2021-11-20 23:45:59,694 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 134 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable134 [2021-11-20 23:45:59,694 INFO L402 AbstractCegarLoop]: === Iteration 136 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:45:59,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:59,694 INFO L85 PathProgramCache]: Analyzing trace with hash -1685997375, now seen corresponding path program 29 times [2021-11-20 23:45:59,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:59,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344545692] [2021-11-20 23:45:59,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:59,695 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:59,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:00,072 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 302 proven. 163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:00,072 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:00,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344545692] [2021-11-20 23:46:00,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1344545692] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:46:00,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463990526] [2021-11-20 23:46:00,073 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:46:00,073 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:00,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:00,073 INFO L229 MonitoredProcess]: Starting monitored process 135 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:00,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (135)] Waiting until timeout for monitored process [2021-11-20 23:46:00,131 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-20 23:46:00,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:46:00,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:46:00,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:01,146 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:01,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:01,315 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:01,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463990526] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:01,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [775524900] [2021-11-20 23:46:01,316 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:46:01,316 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:01,316 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:01,316 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:01,316 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:02,154 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:02,631 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:46:02,631 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:46:02,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 69 [2021-11-20 23:46:02,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721331269] [2021-11-20 23:46:02,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:46:02,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2021-11-20 23:46:02,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:02,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-11-20 23:46:02,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=964, Invalid=5042, Unknown=0, NotChecked=0, Total=6006 [2021-11-20 23:46:02,632 INFO L87 Difference]: Start difference. First operand 84 states and 101 transitions. Second operand has 70 states, 70 states have (on average 2.0) internal successors, (140), 69 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:04,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:04,104 INFO L93 Difference]: Finished difference Result 200 states and 219 transitions. [2021-11-20 23:46:04,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-20 23:46:04,105 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.0) internal successors, (140), 69 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-20 23:46:04,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:04,105 INFO L225 Difference]: With dead ends: 200 [2021-11-20 23:46:04,105 INFO L226 Difference]: Without dead ends: 149 [2021-11-20 23:46:04,106 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4262 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1911, Invalid=10079, Unknown=0, NotChecked=0, Total=11990 [2021-11-20 23:46:04,106 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 27 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 354 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 399 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:04,106 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 188 Invalid, 399 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 354 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:46:04,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-20 23:46:04,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 85. [2021-11-20 23:46:04,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:04,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2021-11-20 23:46:04,484 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2021-11-20 23:46:04,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:04,485 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2021-11-20 23:46:04,485 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 2.0) internal successors, (140), 69 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:04,485 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2021-11-20 23:46:04,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:46:04,485 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:04,485 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:46:04,506 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (135)] Ended with exit code 0 [2021-11-20 23:46:04,685 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 135 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable135 [2021-11-20 23:46:04,686 INFO L402 AbstractCegarLoop]: === Iteration 137 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:46:04,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:04,686 INFO L85 PathProgramCache]: Analyzing trace with hash -308565934, now seen corresponding path program 92 times [2021-11-20 23:46:04,686 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:04,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637947002] [2021-11-20 23:46:04,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:04,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:04,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:05,059 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 302 proven. 149 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:05,059 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:05,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637947002] [2021-11-20 23:46:05,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1637947002] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:46:05,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1969676934] [2021-11-20 23:46:05,059 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:46:05,059 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:05,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:05,060 INFO L229 MonitoredProcess]: Starting monitored process 136 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:05,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (136)] Waiting until timeout for monitored process [2021-11-20 23:46:05,118 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-20 23:46:05,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:46:05,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:46:05,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:06,105 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 345 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:06,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:06,268 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 345 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:06,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1969676934] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:06,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1190146027] [2021-11-20 23:46:06,269 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:46:06,269 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:06,269 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:06,269 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:06,269 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:07,139 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:07,540 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:46:07,540 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:46:07,540 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 68 [2021-11-20 23:46:07,540 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607417441] [2021-11-20 23:46:07,541 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:46:07,541 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-20 23:46:07,541 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:07,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-20 23:46:07,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=906, Invalid=4946, Unknown=0, NotChecked=0, Total=5852 [2021-11-20 23:46:07,542 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 69 states, 69 states have (on average 2.028985507246377) internal successors, (140), 68 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:09,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:09,661 INFO L93 Difference]: Finished difference Result 264 states and 284 transitions. [2021-11-20 23:46:09,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-20 23:46:09,661 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 2.028985507246377) internal successors, (140), 68 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-20 23:46:09,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:09,661 INFO L225 Difference]: With dead ends: 264 [2021-11-20 23:46:09,662 INFO L226 Difference]: Without dead ends: 213 [2021-11-20 23:46:09,662 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5321 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2312, Invalid=12694, Unknown=0, NotChecked=0, Total=15006 [2021-11-20 23:46:09,662 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 34 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 449 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 516 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:09,663 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 242 Invalid, 516 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 449 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:46:09,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-11-20 23:46:10,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 85. [2021-11-20 23:46:10,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:10,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2021-11-20 23:46:10,036 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2021-11-20 23:46:10,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:10,036 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2021-11-20 23:46:10,036 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 2.028985507246377) internal successors, (140), 68 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:10,036 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2021-11-20 23:46:10,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:46:10,037 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:10,037 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 13, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:46:10,063 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (136)] Forceful destruction successful, exit code 0 [2021-11-20 23:46:10,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable136,136 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:10,246 INFO L402 AbstractCegarLoop]: === Iteration 138 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:46:10,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:10,246 INFO L85 PathProgramCache]: Analyzing trace with hash -1649605983, now seen corresponding path program 93 times [2021-11-20 23:46:10,246 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:10,246 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [292200898] [2021-11-20 23:46:10,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:10,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:10,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:10,631 INFO L134 CoverageAnalysis]: Checked inductivity of 439 backedges. 302 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:10,631 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:10,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [292200898] [2021-11-20 23:46:10,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [292200898] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:46:10,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [795468587] [2021-11-20 23:46:10,631 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:46:10,631 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:10,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:10,632 INFO L229 MonitoredProcess]: Starting monitored process 137 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:10,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (137)] Waiting until timeout for monitored process [2021-11-20 23:46:10,680 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:46:10,680 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:46:10,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:46:10,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:11,638 INFO L134 CoverageAnalysis]: Checked inductivity of 439 backedges. 345 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:11,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:11,801 INFO L134 CoverageAnalysis]: Checked inductivity of 439 backedges. 345 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:11,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [795468587] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:11,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1623131365] [2021-11-20 23:46:11,802 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:46:11,802 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:11,802 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:11,802 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:11,802 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:12,696 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:13,097 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:46:13,097 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:46:13,097 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2021-11-20 23:46:13,097 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034596308] [2021-11-20 23:46:13,097 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:46:13,098 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-20 23:46:13,098 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:13,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-20 23:46:13,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=864, Invalid=4836, Unknown=0, NotChecked=0, Total=5700 [2021-11-20 23:46:13,098 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 68 states, 68 states have (on average 2.0441176470588234) internal successors, (139), 67 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:15,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:15,825 INFO L93 Difference]: Finished difference Result 327 states and 348 transitions. [2021-11-20 23:46:15,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-20 23:46:15,825 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 2.0441176470588234) internal successors, (139), 67 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-20 23:46:15,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:15,826 INFO L225 Difference]: With dead ends: 327 [2021-11-20 23:46:15,826 INFO L226 Difference]: Without dead ends: 276 [2021-11-20 23:46:15,827 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6340 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2741, Invalid=15081, Unknown=0, NotChecked=0, Total=17822 [2021-11-20 23:46:15,827 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 52 mSDsluCounter, 344 mSDsCounter, 0 mSdLazyCounter, 661 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 365 SdHoareTripleChecker+Invalid, 750 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 661 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:15,827 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 365 Invalid, 750 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 661 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:46:15,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2021-11-20 23:46:16,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 85. [2021-11-20 23:46:16,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:16,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2021-11-20 23:46:16,206 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2021-11-20 23:46:16,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:16,206 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2021-11-20 23:46:16,206 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 2.0441176470588234) internal successors, (139), 67 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:16,207 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2021-11-20 23:46:16,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:46:16,207 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:16,207 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 12, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:46:16,227 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (137)] Ended with exit code 0 [2021-11-20 23:46:16,407 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable137,137 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:16,407 INFO L402 AbstractCegarLoop]: === Iteration 139 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:46:16,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:16,408 INFO L85 PathProgramCache]: Analyzing trace with hash -168844686, now seen corresponding path program 94 times [2021-11-20 23:46:16,408 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:16,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [921858751] [2021-11-20 23:46:16,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:16,408 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:16,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:16,788 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 302 proven. 127 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:16,788 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:16,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [921858751] [2021-11-20 23:46:16,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [921858751] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:46:16,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582883895] [2021-11-20 23:46:16,789 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:46:16,789 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:16,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:16,789 INFO L229 MonitoredProcess]: Starting monitored process 138 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:16,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (138)] Waiting until timeout for monitored process [2021-11-20 23:46:16,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:16,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:46:16,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:17,785 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 345 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:17,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:17,947 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 345 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:17,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1582883895] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:17,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2084169549] [2021-11-20 23:46:17,948 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:46:17,948 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:17,948 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:17,948 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:17,948 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:18,819 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:19,221 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:46:19,221 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:46:19,221 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 66 [2021-11-20 23:46:19,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355296125] [2021-11-20 23:46:19,221 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:46:19,221 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-20 23:46:19,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:19,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-20 23:46:19,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=826, Invalid=4724, Unknown=0, NotChecked=0, Total=5550 [2021-11-20 23:46:19,222 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 67 states, 67 states have (on average 2.0597014925373136) internal successors, (138), 66 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:22,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:22,481 INFO L93 Difference]: Finished difference Result 389 states and 411 transitions. [2021-11-20 23:46:22,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-11-20 23:46:22,481 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.0597014925373136) internal successors, (138), 66 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-20 23:46:22,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:22,482 INFO L225 Difference]: With dead ends: 389 [2021-11-20 23:46:22,482 INFO L226 Difference]: Without dead ends: 338 [2021-11-20 23:46:22,483 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 163 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7254 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=3137, Invalid=17169, Unknown=0, NotChecked=0, Total=20306 [2021-11-20 23:46:22,483 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 63 mSDsluCounter, 278 mSDsCounter, 0 mSdLazyCounter, 540 mSolverCounterSat, 112 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 652 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 540 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:22,483 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 299 Invalid, 652 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 540 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:46:22,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2021-11-20 23:46:22,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 85. [2021-11-20 23:46:22,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:22,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2021-11-20 23:46:22,879 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2021-11-20 23:46:22,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:22,879 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2021-11-20 23:46:22,880 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 2.0597014925373136) internal successors, (138), 66 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:22,880 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2021-11-20 23:46:22,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:46:22,880 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:22,880 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:46:22,900 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (138)] Forceful destruction successful, exit code 0 [2021-11-20 23:46:23,080 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 138 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable138 [2021-11-20 23:46:23,081 INFO L402 AbstractCegarLoop]: === Iteration 140 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:46:23,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:23,081 INFO L85 PathProgramCache]: Analyzing trace with hash 1541489793, now seen corresponding path program 95 times [2021-11-20 23:46:23,081 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:23,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344613337] [2021-11-20 23:46:23,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:23,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:23,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:23,446 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 302 proven. 119 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:23,447 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:23,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344613337] [2021-11-20 23:46:23,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1344613337] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:46:23,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [123562380] [2021-11-20 23:46:23,447 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:46:23,447 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:23,447 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:23,448 INFO L229 MonitoredProcess]: Starting monitored process 139 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:23,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (139)] Waiting until timeout for monitored process [2021-11-20 23:46:23,506 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-20 23:46:23,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:46:23,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:46:23,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:24,443 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 345 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:24,443 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:24,636 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 345 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:24,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [123562380] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:24,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [711170817] [2021-11-20 23:46:24,637 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:46:24,637 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:24,637 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:24,637 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:24,637 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:25,531 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:25,931 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:46:25,931 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:46:25,931 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 65 [2021-11-20 23:46:25,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608469303] [2021-11-20 23:46:25,932 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:46:25,932 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-20 23:46:25,932 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:25,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-20 23:46:25,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=792, Invalid=4610, Unknown=0, NotChecked=0, Total=5402 [2021-11-20 23:46:25,933 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 66 states, 66 states have (on average 2.0757575757575757) internal successors, (137), 65 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:29,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:29,779 INFO L93 Difference]: Finished difference Result 450 states and 473 transitions. [2021-11-20 23:46:29,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-11-20 23:46:29,780 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.0757575757575757) internal successors, (137), 65 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-20 23:46:29,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:29,780 INFO L225 Difference]: With dead ends: 450 [2021-11-20 23:46:29,780 INFO L226 Difference]: Without dead ends: 399 [2021-11-20 23:46:29,781 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8022 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3473, Invalid=18877, Unknown=0, NotChecked=0, Total=22350 [2021-11-20 23:46:29,781 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 89 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 516 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 673 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 516 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:29,781 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 284 Invalid, 673 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 516 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:46:29,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2021-11-20 23:46:30,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 85. [2021-11-20 23:46:30,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:30,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2021-11-20 23:46:30,179 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2021-11-20 23:46:30,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:30,179 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2021-11-20 23:46:30,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 2.0757575757575757) internal successors, (137), 65 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:30,179 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2021-11-20 23:46:30,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:46:30,179 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:30,179 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 10, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:46:30,199 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (139)] Forceful destruction successful, exit code 0 [2021-11-20 23:46:30,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable139,139 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:30,380 INFO L402 AbstractCegarLoop]: === Iteration 141 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:46:30,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:30,380 INFO L85 PathProgramCache]: Analyzing trace with hash -1589926766, now seen corresponding path program 96 times [2021-11-20 23:46:30,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:30,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250140849] [2021-11-20 23:46:30,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:30,380 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:30,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:30,736 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 302 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:30,736 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:30,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250140849] [2021-11-20 23:46:30,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1250140849] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:46:30,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1829746454] [2021-11-20 23:46:30,736 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:46:30,736 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:30,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:30,737 INFO L229 MonitoredProcess]: Starting monitored process 140 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:30,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (140)] Waiting until timeout for monitored process [2021-11-20 23:46:30,785 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:46:30,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:46:30,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:46:30,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:31,691 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 345 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:31,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:31,889 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 345 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:31,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1829746454] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:31,889 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [344042389] [2021-11-20 23:46:31,889 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:46:31,890 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:31,890 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:31,890 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:31,890 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:32,717 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:33,110 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:46:33,110 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:46:33,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 64 [2021-11-20 23:46:33,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913596899] [2021-11-20 23:46:33,111 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:46:33,111 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-20 23:46:33,111 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:33,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-20 23:46:33,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=762, Invalid=4494, Unknown=0, NotChecked=0, Total=5256 [2021-11-20 23:46:33,112 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 65 states, 65 states have (on average 2.0923076923076924) internal successors, (136), 64 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:37,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:37,391 INFO L93 Difference]: Finished difference Result 510 states and 534 transitions. [2021-11-20 23:46:37,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-11-20 23:46:37,392 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.0923076923076924) internal successors, (136), 64 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-20 23:46:37,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:37,392 INFO L225 Difference]: With dead ends: 510 [2021-11-20 23:46:37,392 INFO L226 Difference]: Without dead ends: 459 [2021-11-20 23:46:37,393 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8599 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=3728, Invalid=20142, Unknown=0, NotChecked=0, Total=23870 [2021-11-20 23:46:37,393 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 82 mSDsluCounter, 260 mSDsCounter, 0 mSdLazyCounter, 488 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:37,394 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 279 Invalid, 623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 488 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:46:37,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2021-11-20 23:46:37,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 85. [2021-11-20 23:46:37,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:37,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2021-11-20 23:46:37,815 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2021-11-20 23:46:37,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:37,815 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2021-11-20 23:46:37,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 2.0923076923076924) internal successors, (136), 64 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:37,815 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2021-11-20 23:46:37,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:46:37,815 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:37,815 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 9, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:46:37,836 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (140)] Ended with exit code 0 [2021-11-20 23:46:38,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable140,140 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:38,018 INFO L402 AbstractCegarLoop]: === Iteration 142 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:46:38,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:38,018 INFO L85 PathProgramCache]: Analyzing trace with hash -1275298207, now seen corresponding path program 97 times [2021-11-20 23:46:38,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:38,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1297654118] [2021-11-20 23:46:38,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:38,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:38,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:38,373 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 302 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:38,374 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:38,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1297654118] [2021-11-20 23:46:38,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1297654118] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:46:38,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1240953646] [2021-11-20 23:46:38,374 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:46:38,374 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:38,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:38,375 INFO L229 MonitoredProcess]: Starting monitored process 141 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:38,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (141)] Waiting until timeout for monitored process [2021-11-20 23:46:38,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:38,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:46:38,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:39,319 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 345 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:39,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:39,489 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 345 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:39,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1240953646] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:39,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1949172158] [2021-11-20 23:46:39,490 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:46:39,490 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:39,491 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:39,491 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:39,491 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:40,349 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:40,744 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:46:40,745 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:46:40,745 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 63 [2021-11-20 23:46:40,745 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961555495] [2021-11-20 23:46:40,745 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:46:40,745 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-20 23:46:40,745 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:40,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-20 23:46:40,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=736, Invalid=4376, Unknown=0, NotChecked=0, Total=5112 [2021-11-20 23:46:40,746 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 64 states, 64 states have (on average 2.109375) internal successors, (135), 63 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:45,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:45,566 INFO L93 Difference]: Finished difference Result 569 states and 594 transitions. [2021-11-20 23:46:45,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2021-11-20 23:46:45,566 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.109375) internal successors, (135), 63 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-20 23:46:45,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:45,567 INFO L225 Difference]: With dead ends: 569 [2021-11-20 23:46:45,567 INFO L226 Difference]: Without dead ends: 518 [2021-11-20 23:46:45,568 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8952 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=3887, Invalid=20919, Unknown=0, NotChecked=0, Total=24806 [2021-11-20 23:46:45,568 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 122 mSDsluCounter, 306 mSDsCounter, 0 mSdLazyCounter, 557 mSolverCounterSat, 202 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 759 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 202 IncrementalHoareTripleChecker+Valid, 557 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:45,568 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 324 Invalid, 759 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [202 Valid, 557 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:46:45,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2021-11-20 23:46:45,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 85. [2021-11-20 23:46:45,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:45,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2021-11-20 23:46:45,991 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2021-11-20 23:46:45,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:45,991 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2021-11-20 23:46:45,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.109375) internal successors, (135), 63 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:45,991 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2021-11-20 23:46:45,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:46:45,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:45,992 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 8, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:46:46,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (141)] Forceful destruction successful, exit code 0 [2021-11-20 23:46:46,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable141,141 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:46,192 INFO L402 AbstractCegarLoop]: === Iteration 143 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:46:46,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:46,192 INFO L85 PathProgramCache]: Analyzing trace with hash -572412238, now seen corresponding path program 98 times [2021-11-20 23:46:46,193 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:46,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [61333495] [2021-11-20 23:46:46,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:46,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:46,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:46,560 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 302 proven. 107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:46,560 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:46,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [61333495] [2021-11-20 23:46:46,560 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [61333495] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:46:46,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [59444497] [2021-11-20 23:46:46,560 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:46:46,560 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:46,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:46,561 INFO L229 MonitoredProcess]: Starting monitored process 142 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:46,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (142)] Waiting until timeout for monitored process [2021-11-20 23:46:46,621 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-20 23:46:46,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:46:46,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:46:46,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:47,501 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 345 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:47,501 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:47,664 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 345 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:47,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [59444497] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:47,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [641652804] [2021-11-20 23:46:47,665 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:46:47,665 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:47,665 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:47,665 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:47,665 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:48,552 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:48,944 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:46:48,944 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:46:48,945 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 62 [2021-11-20 23:46:48,945 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937900772] [2021-11-20 23:46:48,945 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:46:48,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-20 23:46:48,945 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:48,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-20 23:46:48,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=714, Invalid=4256, Unknown=0, NotChecked=0, Total=4970 [2021-11-20 23:46:48,946 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 63 states, 63 states have (on average 2.126984126984127) internal successors, (134), 62 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:53,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:53,965 INFO L93 Difference]: Finished difference Result 627 states and 653 transitions. [2021-11-20 23:46:53,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-11-20 23:46:53,965 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.126984126984127) internal successors, (134), 62 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-20 23:46:53,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:53,966 INFO L225 Difference]: With dead ends: 627 [2021-11-20 23:46:53,966 INFO L226 Difference]: Without dead ends: 576 [2021-11-20 23:46:53,968 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9060 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3941, Invalid=21181, Unknown=0, NotChecked=0, Total=25122 [2021-11-20 23:46:53,969 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 132 mSDsluCounter, 321 mSDsCounter, 0 mSdLazyCounter, 598 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 764 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:53,969 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 337 Invalid, 764 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 598 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:46:53,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 576 states. [2021-11-20 23:46:54,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 576 to 85. [2021-11-20 23:46:54,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:54,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2021-11-20 23:46:54,480 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2021-11-20 23:46:54,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:54,480 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2021-11-20 23:46:54,480 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 2.126984126984127) internal successors, (134), 62 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:54,481 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2021-11-20 23:46:54,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:46:54,481 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:54,481 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 8, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:46:54,501 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (142)] Ended with exit code 0 [2021-11-20 23:46:54,681 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable142,142 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:54,681 INFO L402 AbstractCegarLoop]: === Iteration 144 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:46:54,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:54,682 INFO L85 PathProgramCache]: Analyzing trace with hash 1667018817, now seen corresponding path program 99 times [2021-11-20 23:46:54,682 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:54,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [269591395] [2021-11-20 23:46:54,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:54,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:54,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:55,088 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 302 proven. 107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:55,088 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:55,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [269591395] [2021-11-20 23:46:55,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [269591395] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:46:55,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [806538330] [2021-11-20 23:46:55,088 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:46:55,088 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:55,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:55,089 INFO L229 MonitoredProcess]: Starting monitored process 143 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:55,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (143)] Waiting until timeout for monitored process [2021-11-20 23:46:55,141 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:46:55,141 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:46:55,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:46:55,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:56,039 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 345 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:56,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:56,200 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 345 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:46:56,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [806538330] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:56,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [225592220] [2021-11-20 23:46:56,201 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:46:56,201 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:56,201 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:56,201 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:56,201 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:57,101 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:57,496 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:46:57,497 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:46:57,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 61 [2021-11-20 23:46:57,497 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729840230] [2021-11-20 23:46:57,497 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:46:57,497 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-20 23:46:57,497 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:57,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-20 23:46:57,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=696, Invalid=4134, Unknown=0, NotChecked=0, Total=4830 [2021-11-20 23:46:57,498 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 62 states, 62 states have (on average 2.1451612903225805) internal successors, (133), 61 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:02,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:47:02,928 INFO L93 Difference]: Finished difference Result 684 states and 711 transitions. [2021-11-20 23:47:02,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2021-11-20 23:47:02,928 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.1451612903225805) internal successors, (133), 61 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-20 23:47:02,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:47:02,929 INFO L225 Difference]: With dead ends: 684 [2021-11-20 23:47:02,929 INFO L226 Difference]: Without dead ends: 633 [2021-11-20 23:47:02,930 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8914 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3887, Invalid=20919, Unknown=0, NotChecked=0, Total=24806 [2021-11-20 23:47:02,930 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 124 mSDsluCounter, 409 mSDsCounter, 0 mSdLazyCounter, 716 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 424 SdHoareTripleChecker+Invalid, 844 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 716 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:47:02,930 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [124 Valid, 424 Invalid, 844 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 716 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:47:02,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 633 states. [2021-11-20 23:47:03,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 633 to 85. [2021-11-20 23:47:03,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:03,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2021-11-20 23:47:03,365 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2021-11-20 23:47:03,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:47:03,365 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2021-11-20 23:47:03,365 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.1451612903225805) internal successors, (133), 61 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:03,365 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2021-11-20 23:47:03,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:47:03,365 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:47:03,365 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 9, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:47:03,385 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (143)] Ended with exit code 0 [2021-11-20 23:47:03,566 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable143,143 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:47:03,566 INFO L402 AbstractCegarLoop]: === Iteration 145 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:47:03,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:47:03,566 INFO L85 PathProgramCache]: Analyzing trace with hash -893140782, now seen corresponding path program 100 times [2021-11-20 23:47:03,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:47:03,566 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1898897508] [2021-11-20 23:47:03,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:47:03,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:47:03,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:47:03,928 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 302 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:03,929 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:47:03,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1898897508] [2021-11-20 23:47:03,929 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1898897508] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:47:03,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [458164446] [2021-11-20 23:47:03,929 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:47:03,929 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:47:03,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:47:03,930 INFO L229 MonitoredProcess]: Starting monitored process 144 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:47:03,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (144)] Waiting until timeout for monitored process [2021-11-20 23:47:03,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:47:03,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:47:03,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:47:04,834 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 345 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:04,835 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:47:04,996 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 345 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:04,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [458164446] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:47:04,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2145447407] [2021-11-20 23:47:04,997 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:47:04,997 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:47:04,998 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:47:04,998 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:47:04,998 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:47:05,901 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:47:06,294 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:47:06,294 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:47:06,294 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 60 [2021-11-20 23:47:06,294 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766747057] [2021-11-20 23:47:06,294 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:47:06,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-20 23:47:06,294 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:47:06,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-20 23:47:06,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=682, Invalid=4010, Unknown=0, NotChecked=0, Total=4692 [2021-11-20 23:47:06,295 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 61 states, 61 states have (on average 2.1639344262295084) internal successors, (132), 60 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:12,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:47:12,033 INFO L93 Difference]: Finished difference Result 740 states and 768 transitions. [2021-11-20 23:47:12,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-11-20 23:47:12,033 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.1639344262295084) internal successors, (132), 60 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-20 23:47:12,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:47:12,034 INFO L225 Difference]: With dead ends: 740 [2021-11-20 23:47:12,034 INFO L226 Difference]: Without dead ends: 689 [2021-11-20 23:47:12,035 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8517 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=3728, Invalid=20142, Unknown=0, NotChecked=0, Total=23870 [2021-11-20 23:47:12,035 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 182 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 560 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 745 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:47:12,035 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [182 Valid, 332 Invalid, 745 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 560 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:47:12,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 689 states. [2021-11-20 23:47:12,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 689 to 85. [2021-11-20 23:47:12,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:12,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2021-11-20 23:47:12,491 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2021-11-20 23:47:12,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:47:12,492 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2021-11-20 23:47:12,492 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.1639344262295084) internal successors, (132), 60 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:12,492 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2021-11-20 23:47:12,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:47:12,492 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:47:12,492 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 10, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:47:12,513 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (144)] Forceful destruction successful, exit code 0 [2021-11-20 23:47:12,694 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable144,144 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:47:12,694 INFO L402 AbstractCegarLoop]: === Iteration 146 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:47:12,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:47:12,694 INFO L85 PathProgramCache]: Analyzing trace with hash -421537247, now seen corresponding path program 101 times [2021-11-20 23:47:12,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:47:12,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [574509880] [2021-11-20 23:47:12,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:47:12,695 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:47:12,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:47:13,052 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 302 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:13,052 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:47:13,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [574509880] [2021-11-20 23:47:13,052 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [574509880] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:47:13,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1549380773] [2021-11-20 23:47:13,052 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:47:13,052 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:47:13,052 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:47:13,053 INFO L229 MonitoredProcess]: Starting monitored process 145 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:47:13,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (145)] Waiting until timeout for monitored process [2021-11-20 23:47:13,113 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-20 23:47:13,113 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:47:13,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:47:13,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:47:13,961 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 345 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:13,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:47:14,127 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 345 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:14,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1549380773] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:47:14,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1260869174] [2021-11-20 23:47:14,128 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:47:14,128 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:47:14,128 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:47:14,128 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:47:14,128 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:47:15,084 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:47:15,484 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:47:15,484 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:47:15,484 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 59 [2021-11-20 23:47:15,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547442725] [2021-11-20 23:47:15,484 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:47:15,484 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-20 23:47:15,484 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:47:15,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-20 23:47:15,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=3884, Unknown=0, NotChecked=0, Total=4556 [2021-11-20 23:47:15,485 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 60 states, 60 states have (on average 2.183333333333333) internal successors, (131), 59 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:21,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:47:21,212 INFO L93 Difference]: Finished difference Result 795 states and 824 transitions. [2021-11-20 23:47:21,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2021-11-20 23:47:21,212 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.183333333333333) internal successors, (131), 59 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-20 23:47:21,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:47:21,213 INFO L225 Difference]: With dead ends: 795 [2021-11-20 23:47:21,213 INFO L226 Difference]: Without dead ends: 744 [2021-11-20 23:47:21,215 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7884 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3473, Invalid=18877, Unknown=0, NotChecked=0, Total=22350 [2021-11-20 23:47:21,215 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 217 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 510 mSolverCounterSat, 216 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 217 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 726 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 216 IncrementalHoareTripleChecker+Valid, 510 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:47:21,215 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [217 Valid, 294 Invalid, 726 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [216 Valid, 510 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:47:21,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 744 states. [2021-11-20 23:47:21,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 744 to 85. [2021-11-20 23:47:21,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:21,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2021-11-20 23:47:21,722 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2021-11-20 23:47:21,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:47:21,722 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2021-11-20 23:47:21,722 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 2.183333333333333) internal successors, (131), 59 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:21,722 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2021-11-20 23:47:21,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:47:21,723 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:47:21,723 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:47:21,742 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (145)] Ended with exit code 0 [2021-11-20 23:47:21,923 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 145 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable145 [2021-11-20 23:47:21,923 INFO L402 AbstractCegarLoop]: === Iteration 147 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:47:21,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:47:21,923 INFO L85 PathProgramCache]: Analyzing trace with hash -683418894, now seen corresponding path program 102 times [2021-11-20 23:47:21,923 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:47:21,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613660735] [2021-11-20 23:47:21,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:47:21,924 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:47:21,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:47:22,275 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 302 proven. 119 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:22,276 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:47:22,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613660735] [2021-11-20 23:47:22,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1613660735] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:47:22,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1470078210] [2021-11-20 23:47:22,276 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:47:22,276 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:47:22,276 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:47:22,277 INFO L229 MonitoredProcess]: Starting monitored process 146 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:47:22,277 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (146)] Waiting until timeout for monitored process [2021-11-20 23:47:22,325 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:47:22,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:47:22,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:47:22,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:47:23,129 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 345 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:23,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:47:23,286 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 345 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:23,286 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1470078210] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:47:23,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1484127218] [2021-11-20 23:47:23,287 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:47:23,287 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:47:23,287 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:47:23,287 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:47:23,288 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:47:24,123 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:47:24,511 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:47:24,511 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:47:24,511 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 58 [2021-11-20 23:47:24,511 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283577967] [2021-11-20 23:47:24,511 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:47:24,512 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-20 23:47:24,512 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:47:24,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-20 23:47:24,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=3756, Unknown=0, NotChecked=0, Total=4422 [2021-11-20 23:47:24,512 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 59 states, 59 states have (on average 2.2033898305084745) internal successors, (130), 58 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:30,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:47:30,155 INFO L93 Difference]: Finished difference Result 849 states and 879 transitions. [2021-11-20 23:47:30,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-11-20 23:47:30,155 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.2033898305084745) internal successors, (130), 58 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-20 23:47:30,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:47:30,156 INFO L225 Difference]: With dead ends: 849 [2021-11-20 23:47:30,156 INFO L226 Difference]: Without dead ends: 798 [2021-11-20 23:47:30,156 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 171 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7042 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3137, Invalid=17169, Unknown=0, NotChecked=0, Total=20306 [2021-11-20 23:47:30,157 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 236 mSDsluCounter, 320 mSDsCounter, 0 mSdLazyCounter, 564 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 236 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 725 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 564 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:47:30,157 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [236 Valid, 333 Invalid, 725 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 564 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:47:30,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 798 states. [2021-11-20 23:47:30,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 798 to 85. [2021-11-20 23:47:30,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:30,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2021-11-20 23:47:30,594 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2021-11-20 23:47:30,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:47:30,594 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2021-11-20 23:47:30,594 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.2033898305084745) internal successors, (130), 58 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:30,594 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2021-11-20 23:47:30,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:47:30,595 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:47:30,595 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 12, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:47:30,615 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (146)] Forceful destruction successful, exit code 0 [2021-11-20 23:47:30,795 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 146 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable146 [2021-11-20 23:47:30,795 INFO L402 AbstractCegarLoop]: === Iteration 148 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:47:30,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:47:30,796 INFO L85 PathProgramCache]: Analyzing trace with hash 1524890625, now seen corresponding path program 103 times [2021-11-20 23:47:30,796 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:47:30,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377905549] [2021-11-20 23:47:30,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:47:30,796 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:47:30,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:47:31,148 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 302 proven. 127 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:31,148 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:47:31,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [377905549] [2021-11-20 23:47:31,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [377905549] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:47:31,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676002517] [2021-11-20 23:47:31,149 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:47:31,149 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:47:31,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:47:31,149 INFO L229 MonitoredProcess]: Starting monitored process 147 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:47:31,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (147)] Waiting until timeout for monitored process [2021-11-20 23:47:31,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:47:31,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:47:31,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:47:31,980 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 345 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:31,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:47:32,138 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 345 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:32,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1676002517] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:47:32,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1544546858] [2021-11-20 23:47:32,139 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:47:32,139 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:47:32,139 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:47:32,140 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:47:32,140 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:47:32,980 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:47:33,367 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:47:33,368 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:47:33,368 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 57 [2021-11-20 23:47:33,368 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016714528] [2021-11-20 23:47:33,368 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:47:33,368 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-20 23:47:33,368 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:47:33,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-20 23:47:33,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=3626, Unknown=0, NotChecked=0, Total=4290 [2021-11-20 23:47:33,369 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 58 states, 58 states have (on average 2.2241379310344827) internal successors, (129), 57 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:39,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:47:39,134 INFO L93 Difference]: Finished difference Result 902 states and 933 transitions. [2021-11-20 23:47:39,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-11-20 23:47:39,134 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.2241379310344827) internal successors, (129), 57 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-20 23:47:39,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:47:39,135 INFO L225 Difference]: With dead ends: 902 [2021-11-20 23:47:39,135 INFO L226 Difference]: Without dead ends: 851 [2021-11-20 23:47:39,136 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6030 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2741, Invalid=15081, Unknown=0, NotChecked=0, Total=17822 [2021-11-20 23:47:39,136 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 296 mSDsluCounter, 301 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 203 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 699 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 203 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:47:39,136 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [296 Valid, 313 Invalid, 699 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [203 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:47:39,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 851 states. [2021-11-20 23:47:39,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 851 to 85. [2021-11-20 23:47:39,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:39,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2021-11-20 23:47:39,593 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2021-11-20 23:47:39,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:47:39,593 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2021-11-20 23:47:39,593 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.2241379310344827) internal successors, (129), 57 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:39,593 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2021-11-20 23:47:39,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:47:39,594 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:47:39,594 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 13, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:47:39,614 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (147)] Ended with exit code 0 [2021-11-20 23:47:39,794 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable147,147 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:47:39,794 INFO L402 AbstractCegarLoop]: === Iteration 149 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:47:39,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:47:39,794 INFO L85 PathProgramCache]: Analyzing trace with hash -482083566, now seen corresponding path program 104 times [2021-11-20 23:47:39,795 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:47:39,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [615659253] [2021-11-20 23:47:39,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:47:39,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:47:39,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:47:40,150 INFO L134 CoverageAnalysis]: Checked inductivity of 439 backedges. 302 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:40,150 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:47:40,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [615659253] [2021-11-20 23:47:40,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [615659253] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:47:40,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1664519981] [2021-11-20 23:47:40,150 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:47:40,150 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:47:40,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:47:40,151 INFO L229 MonitoredProcess]: Starting monitored process 148 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:47:40,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (148)] Waiting until timeout for monitored process [2021-11-20 23:47:40,210 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-20 23:47:40,210 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:47:40,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:47:40,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:47:40,969 INFO L134 CoverageAnalysis]: Checked inductivity of 439 backedges. 345 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:40,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:47:41,128 INFO L134 CoverageAnalysis]: Checked inductivity of 439 backedges. 345 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:41,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1664519981] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:47:41,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [487147424] [2021-11-20 23:47:41,129 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:47:41,129 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:47:41,130 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:47:41,130 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:47:41,130 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:47:42,000 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:47:42,384 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:47:42,384 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:47:42,384 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 56 [2021-11-20 23:47:42,384 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096386508] [2021-11-20 23:47:42,384 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:47:42,385 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-20 23:47:42,385 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:47:42,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-20 23:47:42,385 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=3494, Unknown=0, NotChecked=0, Total=4160 [2021-11-20 23:47:42,385 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 57 states, 57 states have (on average 2.245614035087719) internal successors, (128), 56 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:48,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:47:48,101 INFO L93 Difference]: Finished difference Result 954 states and 986 transitions. [2021-11-20 23:47:48,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-11-20 23:47:48,101 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.245614035087719) internal successors, (128), 56 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-20 23:47:48,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:47:48,104 INFO L225 Difference]: With dead ends: 954 [2021-11-20 23:47:48,104 INFO L226 Difference]: Without dead ends: 903 [2021-11-20 23:47:48,105 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4899 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2312, Invalid=12694, Unknown=0, NotChecked=0, Total=15006 [2021-11-20 23:47:48,106 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 293 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 388 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 293 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 545 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 388 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:47:48,106 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [293 Valid, 247 Invalid, 545 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 388 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:47:48,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 903 states. [2021-11-20 23:47:48,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 903 to 85. [2021-11-20 23:47:48,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:48,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2021-11-20 23:47:48,663 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2021-11-20 23:47:48,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:47:48,663 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2021-11-20 23:47:48,663 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 2.245614035087719) internal successors, (128), 56 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:48,663 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2021-11-20 23:47:48,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:47:48,663 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:47:48,663 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:47:48,683 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (148)] Forceful destruction successful, exit code 0 [2021-11-20 23:47:48,863 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable148,148 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:47:48,864 INFO L402 AbstractCegarLoop]: === Iteration 150 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:47:48,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:47:48,864 INFO L85 PathProgramCache]: Analyzing trace with hash 1531385313, now seen corresponding path program 105 times [2021-11-20 23:47:48,864 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:47:48,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692399124] [2021-11-20 23:47:48,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:47:48,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:47:48,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:47:49,221 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 302 proven. 149 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:49,221 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:47:49,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692399124] [2021-11-20 23:47:49,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1692399124] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:47:49,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [98554733] [2021-11-20 23:47:49,221 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:47:49,221 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:47:49,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:47:49,222 INFO L229 MonitoredProcess]: Starting monitored process 149 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:47:49,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (149)] Waiting until timeout for monitored process [2021-11-20 23:47:49,270 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:47:49,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:47:49,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:47:49,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:47:50,012 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 345 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:50,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:47:50,171 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 345 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:50,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [98554733] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:47:50,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [508092556] [2021-11-20 23:47:50,172 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:47:50,172 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:47:50,172 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:47:50,173 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:47:50,173 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:47:51,000 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:47:51,382 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:47:51,382 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:47:51,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 55 [2021-11-20 23:47:51,383 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385747967] [2021-11-20 23:47:51,383 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:47:51,383 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-20 23:47:51,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:47:51,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-20 23:47:51,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=3360, Unknown=0, NotChecked=0, Total=4032 [2021-11-20 23:47:51,383 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 56 states, 56 states have (on average 2.267857142857143) internal successors, (127), 55 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:57,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:47:57,100 INFO L93 Difference]: Finished difference Result 1005 states and 1038 transitions. [2021-11-20 23:47:57,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-20 23:47:57,100 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.267857142857143) internal successors, (127), 55 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-20 23:47:57,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:47:57,101 INFO L225 Difference]: With dead ends: 1005 [2021-11-20 23:47:57,101 INFO L226 Difference]: Without dead ends: 954 [2021-11-20 23:47:57,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3680 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1883, Invalid=10107, Unknown=0, NotChecked=0, Total=11990 [2021-11-20 23:47:57,102 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 308 mSDsluCounter, 293 mSDsCounter, 0 mSdLazyCounter, 481 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 308 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 579 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 481 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:47:57,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [308 Valid, 303 Invalid, 579 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 481 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:47:57,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 954 states. [2021-11-20 23:47:57,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 954 to 85. [2021-11-20 23:47:57,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:57,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2021-11-20 23:47:57,544 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2021-11-20 23:47:57,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:47:57,544 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2021-11-20 23:47:57,545 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.267857142857143) internal successors, (127), 55 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:57,545 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2021-11-20 23:47:57,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:47:57,545 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:47:57,545 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:47:57,564 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (149)] Forceful destruction successful, exit code 0 [2021-11-20 23:47:57,745 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 149 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable149 [2021-11-20 23:47:57,745 INFO L402 AbstractCegarLoop]: === Iteration 151 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:47:57,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:47:57,746 INFO L85 PathProgramCache]: Analyzing trace with hash 1596335922, now seen corresponding path program 15 times [2021-11-20 23:47:57,746 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:47:57,746 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182818738] [2021-11-20 23:47:57,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:47:57,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:47:57,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:47:58,105 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 302 proven. 163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:58,105 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:47:58,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182818738] [2021-11-20 23:47:58,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1182818738] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:47:58,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066692457] [2021-11-20 23:47:58,105 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:47:58,105 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:47:58,105 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:47:58,106 INFO L229 MonitoredProcess]: Starting monitored process 150 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:47:58,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (150)] Waiting until timeout for monitored process [2021-11-20 23:47:58,154 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:47:58,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:47:58,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:47:58,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:47:58,890 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:58,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:47:59,046 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:59,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2066692457] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:47:59,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1990845883] [2021-11-20 23:47:59,047 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:47:59,047 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:47:59,047 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:47:59,047 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:47:59,047 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:47:59,807 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:48:00,230 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:48:00,230 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:48:00,230 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 54 [2021-11-20 23:48:00,230 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458680302] [2021-11-20 23:48:00,230 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:48:00,230 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-20 23:48:00,230 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:48:00,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-20 23:48:00,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=681, Invalid=3225, Unknown=0, NotChecked=0, Total=3906 [2021-11-20 23:48:00,231 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 55 states, 55 states have (on average 2.272727272727273) internal successors, (125), 54 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:06,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:48:06,006 INFO L93 Difference]: Finished difference Result 1057 states and 1092 transitions. [2021-11-20 23:48:06,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-20 23:48:06,007 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.272727272727273) internal successors, (125), 54 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-20 23:48:06,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:48:06,007 INFO L225 Difference]: With dead ends: 1057 [2021-11-20 23:48:06,007 INFO L226 Difference]: Without dead ends: 1006 [2021-11-20 23:48:06,008 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2533 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1508, Invalid=7422, Unknown=0, NotChecked=0, Total=8930 [2021-11-20 23:48:06,008 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 302 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 357 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 302 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 401 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:48:06,008 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [302 Valid, 228 Invalid, 401 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 357 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:48:06,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1006 states. [2021-11-20 23:48:06,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1006 to 86. [2021-11-20 23:48:06,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.223529411764706) internal successors, (104), 85 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:06,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 104 transitions. [2021-11-20 23:48:06,473 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 104 transitions. Word has length 68 [2021-11-20 23:48:06,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:48:06,473 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 104 transitions. [2021-11-20 23:48:06,473 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.272727272727273) internal successors, (125), 54 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:06,473 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 104 transitions. [2021-11-20 23:48:06,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-20 23:48:06,473 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:48:06,473 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:48:06,494 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (150)] Forceful destruction successful, exit code 0 [2021-11-20 23:48:06,674 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable150,150 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:06,674 INFO L402 AbstractCegarLoop]: === Iteration 152 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:48:06,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:48:06,674 INFO L85 PathProgramCache]: Analyzing trace with hash 2017880645, now seen corresponding path program 30 times [2021-11-20 23:48:06,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:48:06,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919991899] [2021-11-20 23:48:06,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:48:06,675 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:48:06,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:48:06,836 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 136 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:06,836 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:48:06,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919991899] [2021-11-20 23:48:06,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [919991899] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:48:06,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1063242844] [2021-11-20 23:48:06,836 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:48:06,836 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:06,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:48:06,837 INFO L229 MonitoredProcess]: Starting monitored process 151 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:48:06,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (151)] Waiting until timeout for monitored process [2021-11-20 23:48:06,887 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:48:06,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:48:06,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-20 23:48:06,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:48:07,018 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 136 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:07,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:48:07,148 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 136 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:07,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1063242844] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:48:07,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1317776660] [2021-11-20 23:48:07,149 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:48:07,149 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:48:07,150 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:48:07,150 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:48:07,150 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:48:08,018 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:48:08,340 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:48:08,340 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:48:08,341 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 20 [2021-11-20 23:48:08,341 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152697925] [2021-11-20 23:48:08,341 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:48:08,341 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-20 23:48:08,341 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:48:08,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-20 23:48:08,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=603, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:48:08,341 INFO L87 Difference]: Start difference. First operand 86 states and 104 transitions. Second operand has 21 states, 21 states have (on average 3.380952380952381) internal successors, (71), 20 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:09,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:48:09,134 INFO L93 Difference]: Finished difference Result 97 states and 115 transitions. [2021-11-20 23:48:09,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-20 23:48:09,134 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.380952380952381) internal successors, (71), 20 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-20 23:48:09,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:48:09,135 INFO L225 Difference]: With dead ends: 97 [2021-11-20 23:48:09,135 INFO L226 Difference]: Without dead ends: 95 [2021-11-20 23:48:09,135 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 210 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=590, Invalid=1572, Unknown=0, NotChecked=0, Total=2162 [2021-11-20 23:48:09,135 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 92 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 259 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 359 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:48:09,135 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 23 Invalid, 359 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 259 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:48:09,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-20 23:48:09,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 89. [2021-11-20 23:48:09,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 88 states have (on average 1.2159090909090908) internal successors, (107), 88 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:09,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 107 transitions. [2021-11-20 23:48:09,588 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 107 transitions. Word has length 69 [2021-11-20 23:48:09,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:48:09,589 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 107 transitions. [2021-11-20 23:48:09,589 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.380952380952381) internal successors, (71), 20 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:09,589 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 107 transitions. [2021-11-20 23:48:09,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-20 23:48:09,589 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:48:09,589 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:48:09,609 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (151)] Forceful destruction successful, exit code 0 [2021-11-20 23:48:09,789 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable151,151 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:09,790 INFO L402 AbstractCegarLoop]: === Iteration 153 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:48:09,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:48:09,790 INFO L85 PathProgramCache]: Analyzing trace with hash -1970103797, now seen corresponding path program 31 times [2021-11-20 23:48:09,790 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:48:09,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533539733] [2021-11-20 23:48:09,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:48:09,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:48:09,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:48:10,211 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 346 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:10,211 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:48:10,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533539733] [2021-11-20 23:48:10,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1533539733] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:48:10,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1220988387] [2021-11-20 23:48:10,211 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:48:10,211 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:10,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:48:10,212 INFO L229 MonitoredProcess]: Starting monitored process 152 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:48:10,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (152)] Waiting until timeout for monitored process [2021-11-20 23:48:10,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:48:10,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 23:48:10,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:48:11,366 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:11,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:48:11,539 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:11,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1220988387] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:48:11,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1020344388] [2021-11-20 23:48:11,540 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:48:11,540 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:48:11,540 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:48:11,540 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:48:11,540 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:48:12,407 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:48:12,903 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:48:12,903 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:48:12,903 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 73 [2021-11-20 23:48:12,903 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81112619] [2021-11-20 23:48:12,903 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:48:12,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-20 23:48:12,904 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:48:12,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-20 23:48:12,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1072, Invalid=5570, Unknown=0, NotChecked=0, Total=6642 [2021-11-20 23:48:12,904 INFO L87 Difference]: Start difference. First operand 89 states and 107 transitions. Second operand has 74 states, 74 states have (on average 2.0) internal successors, (148), 73 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:14,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:48:14,756 INFO L93 Difference]: Finished difference Result 212 states and 232 transitions. [2021-11-20 23:48:14,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-20 23:48:14,756 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.0) internal successors, (148), 73 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-20 23:48:14,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:48:14,756 INFO L225 Difference]: With dead ends: 212 [2021-11-20 23:48:14,756 INFO L226 Difference]: Without dead ends: 158 [2021-11-20 23:48:14,757 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4758 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2129, Invalid=11211, Unknown=0, NotChecked=0, Total=13340 [2021-11-20 23:48:14,757 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 32 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 526 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 574 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 526 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:48:14,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 276 Invalid, 574 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 526 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:48:14,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-11-20 23:48:15,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 90. [2021-11-20 23:48:15,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.2134831460674158) internal successors, (108), 89 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:15,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 108 transitions. [2021-11-20 23:48:15,247 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 108 transitions. Word has length 72 [2021-11-20 23:48:15,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:48:15,247 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 108 transitions. [2021-11-20 23:48:15,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 2.0) internal successors, (148), 73 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:15,247 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 108 transitions. [2021-11-20 23:48:15,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-20 23:48:15,247 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:48:15,247 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:48:15,270 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (152)] Forceful destruction successful, exit code 0 [2021-11-20 23:48:15,448 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable152,152 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:15,448 INFO L402 AbstractCegarLoop]: === Iteration 154 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:48:15,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:48:15,448 INFO L85 PathProgramCache]: Analyzing trace with hash 1477990684, now seen corresponding path program 106 times [2021-11-20 23:48:15,448 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:48:15,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1237465011] [2021-11-20 23:48:15,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:48:15,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:48:15,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:48:15,858 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 346 proven. 167 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:15,858 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:48:15,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1237465011] [2021-11-20 23:48:15,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1237465011] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:48:15,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [759304180] [2021-11-20 23:48:15,858 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:48:15,858 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:15,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:48:15,859 INFO L229 MonitoredProcess]: Starting monitored process 153 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:48:15,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (153)] Waiting until timeout for monitored process [2021-11-20 23:48:15,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:48:15,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 23:48:15,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:48:16,982 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 392 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:16,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:48:17,153 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 392 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:17,153 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [759304180] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:48:17,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [941073136] [2021-11-20 23:48:17,154 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:48:17,154 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:48:17,154 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:48:17,154 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:48:17,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:48:18,020 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:48:18,452 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:48:18,452 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:48:18,452 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 72 [2021-11-20 23:48:18,452 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913983492] [2021-11-20 23:48:18,452 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:48:18,453 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-20 23:48:18,453 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:48:18,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-20 23:48:18,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1011, Invalid=5469, Unknown=0, NotChecked=0, Total=6480 [2021-11-20 23:48:18,453 INFO L87 Difference]: Start difference. First operand 90 states and 108 transitions. Second operand has 73 states, 73 states have (on average 2.0273972602739727) internal successors, (148), 72 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:21,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:48:21,069 INFO L93 Difference]: Finished difference Result 280 states and 301 transitions. [2021-11-20 23:48:21,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-20 23:48:21,069 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.0273972602739727) internal successors, (148), 72 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-20 23:48:21,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:48:21,070 INFO L225 Difference]: With dead ends: 280 [2021-11-20 23:48:21,070 INFO L226 Difference]: Without dead ends: 226 [2021-11-20 23:48:21,071 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 171 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5969 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2590, Invalid=14180, Unknown=0, NotChecked=0, Total=16770 [2021-11-20 23:48:21,071 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 31 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 630 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 630 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:48:21,071 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 324 Invalid, 678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 630 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:48:21,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-11-20 23:48:21,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 90. [2021-11-20 23:48:21,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.2134831460674158) internal successors, (108), 89 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:21,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 108 transitions. [2021-11-20 23:48:21,580 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 108 transitions. Word has length 72 [2021-11-20 23:48:21,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:48:21,581 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 108 transitions. [2021-11-20 23:48:21,581 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 2.0273972602739727) internal successors, (148), 72 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:21,581 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 108 transitions. [2021-11-20 23:48:21,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-20 23:48:21,581 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:48:21,581 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 14, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:48:21,601 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (153)] Ended with exit code 0 [2021-11-20 23:48:21,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable153,153 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:21,782 INFO L402 AbstractCegarLoop]: === Iteration 155 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:48:21,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:48:21,782 INFO L85 PathProgramCache]: Analyzing trace with hash -1874463765, now seen corresponding path program 107 times [2021-11-20 23:48:21,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:48:21,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608732513] [2021-11-20 23:48:21,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:48:21,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:48:21,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:48:22,198 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 346 proven. 154 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:22,198 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:48:22,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608732513] [2021-11-20 23:48:22,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [608732513] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:48:22,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [445301308] [2021-11-20 23:48:22,198 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:48:22,198 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:22,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:48:22,199 INFO L229 MonitoredProcess]: Starting monitored process 154 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:48:22,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (154)] Waiting until timeout for monitored process [2021-11-20 23:48:22,259 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-11-20 23:48:22,260 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:48:22,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 23:48:22,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:48:23,313 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 392 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:23,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:48:23,484 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 392 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:23,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [445301308] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:48:23,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [374312499] [2021-11-20 23:48:23,485 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:48:23,485 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:48:23,485 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:48:23,485 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:48:23,485 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:48:24,358 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:48:24,770 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:48:24,770 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:48:24,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2021-11-20 23:48:24,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306668293] [2021-11-20 23:48:24,771 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:48:24,771 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-20 23:48:24,771 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:48:24,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-20 23:48:24,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=966, Invalid=5354, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 23:48:24,772 INFO L87 Difference]: Start difference. First operand 90 states and 108 transitions. Second operand has 72 states, 72 states have (on average 2.0416666666666665) internal successors, (147), 71 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:28,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:48:28,119 INFO L93 Difference]: Finished difference Result 347 states and 369 transitions. [2021-11-20 23:48:28,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-11-20 23:48:28,120 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 2.0416666666666665) internal successors, (147), 71 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-20 23:48:28,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:48:28,120 INFO L225 Difference]: With dead ends: 347 [2021-11-20 23:48:28,120 INFO L226 Difference]: Without dead ends: 293 [2021-11-20 23:48:28,121 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7154 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=3088, Invalid=16934, Unknown=0, NotChecked=0, Total=20022 [2021-11-20 23:48:28,121 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 65 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 495 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 495 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:48:28,121 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 261 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 495 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:48:28,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2021-11-20 23:48:28,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 90. [2021-11-20 23:48:28,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.2134831460674158) internal successors, (108), 89 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:28,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 108 transitions. [2021-11-20 23:48:28,647 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 108 transitions. Word has length 72 [2021-11-20 23:48:28,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:48:28,647 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 108 transitions. [2021-11-20 23:48:28,647 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 2.0416666666666665) internal successors, (147), 71 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:28,647 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 108 transitions. [2021-11-20 23:48:28,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-20 23:48:28,647 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:48:28,647 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:48:28,667 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (154)] Ended with exit code 0 [2021-11-20 23:48:28,848 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable154,154 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:28,848 INFO L402 AbstractCegarLoop]: === Iteration 156 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:48:28,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:48:28,848 INFO L85 PathProgramCache]: Analyzing trace with hash -1012776132, now seen corresponding path program 108 times [2021-11-20 23:48:28,848 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:48:28,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075680209] [2021-11-20 23:48:28,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:48:28,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:48:28,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:48:29,249 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 346 proven. 143 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:29,249 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:48:29,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075680209] [2021-11-20 23:48:29,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1075680209] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:48:29,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [955976176] [2021-11-20 23:48:29,250 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:48:29,250 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:29,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:48:29,250 INFO L229 MonitoredProcess]: Starting monitored process 155 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:48:29,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (155)] Waiting until timeout for monitored process [2021-11-20 23:48:29,301 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:48:29,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:48:29,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 23:48:29,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:48:30,342 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 392 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:30,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:48:30,513 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 392 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:30,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [955976176] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:48:30,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [230119175] [2021-11-20 23:48:30,514 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:48:30,514 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:48:30,515 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:48:30,515 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:48:30,515 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:48:31,405 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:48:31,818 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:48:31,818 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:48:31,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 70 [2021-11-20 23:48:31,819 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24736080] [2021-11-20 23:48:31,819 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:48:31,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-20 23:48:31,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:48:31,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-20 23:48:31,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=925, Invalid=5237, Unknown=0, NotChecked=0, Total=6162 [2021-11-20 23:48:31,820 INFO L87 Difference]: Start difference. First operand 90 states and 108 transitions. Second operand has 71 states, 71 states have (on average 2.056338028169014) internal successors, (146), 70 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:35,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:48:35,997 INFO L93 Difference]: Finished difference Result 413 states and 436 transitions. [2021-11-20 23:48:35,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-11-20 23:48:35,997 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 2.056338028169014) internal successors, (146), 70 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-20 23:48:35,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:48:35,998 INFO L225 Difference]: With dead ends: 413 [2021-11-20 23:48:35,998 INFO L226 Difference]: Without dead ends: 359 [2021-11-20 23:48:35,999 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8242 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=3558, Invalid=19394, Unknown=0, NotChecked=0, Total=22952 [2021-11-20 23:48:35,999 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 60 mSDsluCounter, 301 mSDsCounter, 0 mSdLazyCounter, 573 mSolverCounterSat, 117 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 690 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 573 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:48:35,999 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 323 Invalid, 690 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [117 Valid, 573 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:48:35,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2021-11-20 23:48:36,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 90. [2021-11-20 23:48:36,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.2134831460674158) internal successors, (108), 89 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:36,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 108 transitions. [2021-11-20 23:48:36,551 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 108 transitions. Word has length 72 [2021-11-20 23:48:36,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:48:36,551 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 108 transitions. [2021-11-20 23:48:36,551 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 2.056338028169014) internal successors, (146), 70 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:36,551 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 108 transitions. [2021-11-20 23:48:36,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-20 23:48:36,552 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:48:36,552 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:48:36,572 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (155)] Forceful destruction successful, exit code 0 [2021-11-20 23:48:36,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable155,155 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:36,752 INFO L402 AbstractCegarLoop]: === Iteration 157 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:48:36,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:48:36,753 INFO L85 PathProgramCache]: Analyzing trace with hash -1262074421, now seen corresponding path program 109 times [2021-11-20 23:48:36,753 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:48:36,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971873414] [2021-11-20 23:48:36,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:48:36,753 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:48:36,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:48:37,152 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 346 proven. 134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:37,152 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:48:37,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971873414] [2021-11-20 23:48:37,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1971873414] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:48:37,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1664425294] [2021-11-20 23:48:37,152 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:48:37,152 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:37,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:48:37,153 INFO L229 MonitoredProcess]: Starting monitored process 156 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:48:37,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (156)] Waiting until timeout for monitored process [2021-11-20 23:48:37,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:48:37,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 23:48:37,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:48:38,222 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 392 proven. 88 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:38,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:48:38,394 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 392 proven. 88 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:38,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1664425294] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:48:38,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [786277218] [2021-11-20 23:48:38,395 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:48:38,395 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:48:38,395 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:48:38,396 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:48:38,396 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:48:39,303 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:48:39,710 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:48:39,711 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:48:39,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 69 [2021-11-20 23:48:39,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717794919] [2021-11-20 23:48:39,711 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:48:39,711 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2021-11-20 23:48:39,711 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:48:39,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-11-20 23:48:39,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=888, Invalid=5118, Unknown=0, NotChecked=0, Total=6006 [2021-11-20 23:48:39,712 INFO L87 Difference]: Start difference. First operand 90 states and 108 transitions. Second operand has 70 states, 70 states have (on average 2.0714285714285716) internal successors, (145), 69 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:44,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:48:44,470 INFO L93 Difference]: Finished difference Result 478 states and 502 transitions. [2021-11-20 23:48:44,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-11-20 23:48:44,470 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.0714285714285716) internal successors, (145), 69 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-20 23:48:44,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:48:44,471 INFO L225 Difference]: With dead ends: 478 [2021-11-20 23:48:44,471 INFO L226 Difference]: Without dead ends: 424 [2021-11-20 23:48:44,472 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9187 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3970, Invalid=21470, Unknown=0, NotChecked=0, Total=25440 [2021-11-20 23:48:44,472 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 99 mSDsluCounter, 266 mSDsCounter, 0 mSdLazyCounter, 502 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 654 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:48:44,472 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [99 Valid, 286 Invalid, 654 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 502 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:48:44,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2021-11-20 23:48:45,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 90. [2021-11-20 23:48:45,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.2134831460674158) internal successors, (108), 89 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:45,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 108 transitions. [2021-11-20 23:48:45,016 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 108 transitions. Word has length 72 [2021-11-20 23:48:45,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:48:45,016 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 108 transitions. [2021-11-20 23:48:45,017 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 2.0714285714285716) internal successors, (145), 69 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:45,017 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 108 transitions. [2021-11-20 23:48:45,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-20 23:48:45,017 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:48:45,017 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 11, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:48:45,037 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (156)] Forceful destruction successful, exit code 0 [2021-11-20 23:48:45,217 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 156 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable156 [2021-11-20 23:48:45,217 INFO L402 AbstractCegarLoop]: === Iteration 158 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:48:45,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:48:45,218 INFO L85 PathProgramCache]: Analyzing trace with hash 115357020, now seen corresponding path program 110 times [2021-11-20 23:48:45,218 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:48:45,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [140699087] [2021-11-20 23:48:45,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:48:45,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:48:45,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:48:45,621 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 346 proven. 127 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:45,621 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:48:45,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [140699087] [2021-11-20 23:48:45,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [140699087] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:48:45,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [600191483] [2021-11-20 23:48:45,621 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:48:45,621 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:45,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:48:45,622 INFO L229 MonitoredProcess]: Starting monitored process 157 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:48:45,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (157)] Waiting until timeout for monitored process [2021-11-20 23:48:45,683 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-11-20 23:48:45,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:48:45,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 23:48:45,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:48:46,680 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 392 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:46,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:48:46,865 INFO L134 CoverageAnalysis]: Checked inductivity of 473 backedges. 392 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:46,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [600191483] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:48:46,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [198553263] [2021-11-20 23:48:46,866 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:48:46,866 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:48:46,866 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:48:46,866 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:48:46,866 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:48:47,716 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:48:48,125 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:48:48,126 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:48:48,126 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 68 [2021-11-20 23:48:48,126 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297229578] [2021-11-20 23:48:48,126 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:48:48,126 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-20 23:48:48,126 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:48:48,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-20 23:48:48,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=855, Invalid=4997, Unknown=0, NotChecked=0, Total=5852 [2021-11-20 23:48:48,127 INFO L87 Difference]: Start difference. First operand 90 states and 108 transitions. Second operand has 69 states, 69 states have (on average 2.0869565217391304) internal successors, (144), 68 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:53,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:48:53,493 INFO L93 Difference]: Finished difference Result 542 states and 567 transitions. [2021-11-20 23:48:53,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-11-20 23:48:53,493 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 2.0869565217391304) internal successors, (144), 68 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-20 23:48:53,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:48:53,494 INFO L225 Difference]: With dead ends: 542 [2021-11-20 23:48:53,494 INFO L226 Difference]: Without dead ends: 488 [2021-11-20 23:48:53,495 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9938 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=4300, Invalid=23090, Unknown=0, NotChecked=0, Total=27390 [2021-11-20 23:48:53,495 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 124 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 201 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 201 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:48:53,495 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [124 Valid, 253 Invalid, 653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [201 Valid, 452 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:48:53,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 488 states. [2021-11-20 23:48:54,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 488 to 90. [2021-11-20 23:48:54,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.2134831460674158) internal successors, (108), 89 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:54,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 108 transitions. [2021-11-20 23:48:54,045 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 108 transitions. Word has length 72 [2021-11-20 23:48:54,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:48:54,045 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 108 transitions. [2021-11-20 23:48:54,046 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 2.0869565217391304) internal successors, (144), 68 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:48:54,046 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 108 transitions. [2021-11-20 23:48:54,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-20 23:48:54,046 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:48:54,046 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 10, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:48:54,065 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (157)] Ended with exit code 0 [2021-11-20 23:48:54,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 157 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable157 [2021-11-20 23:48:54,246 INFO L402 AbstractCegarLoop]: === Iteration 159 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:48:54,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:48:54,247 INFO L85 PathProgramCache]: Analyzing trace with hash -1225683029, now seen corresponding path program 111 times [2021-11-20 23:48:54,247 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:48:54,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792212440] [2021-11-20 23:48:54,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:48:54,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:48:54,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:48:54,638 INFO L134 CoverageAnalysis]: Checked inductivity of 468 backedges. 346 proven. 122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:54,638 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:48:54,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [792212440] [2021-11-20 23:48:54,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [792212440] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:48:54,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1099744603] [2021-11-20 23:48:54,639 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:48:54,639 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:54,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:48:54,640 INFO L229 MonitoredProcess]: Starting monitored process 158 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:48:54,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddf93ab0-c2b5-4026-aaaf-cb4e4fb4559a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (158)] Waiting until timeout for monitored process [2021-11-20 23:48:54,704 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:48:54,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:48:54,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 23:48:54,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:48:55,691 INFO L134 CoverageAnalysis]: Checked inductivity of 468 backedges. 392 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:55,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:48:55,860 INFO L134 CoverageAnalysis]: Checked inductivity of 468 backedges. 392 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:48:55,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1099744603] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:48:55,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1222379023] [2021-11-20 23:48:55,861 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-20 23:48:55,861 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:48:55,861 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:48:55,861 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:48:55,861 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:48:56,732 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:48:57,143 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:48:57,143 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:48:57,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 67 [2021-11-20 23:48:57,143 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435004046] [2021-11-20 23:48:57,143 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:48:57,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-20 23:48:57,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:48:57,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-20 23:48:57,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=826, Invalid=4874, Unknown=0, NotChecked=0, Total=5700 [2021-11-20 23:48:57,144 INFO L87 Difference]: Start difference. First operand 90 states and 108 transitions. Second operand has 68 states, 68 states have (on average 2.1029411764705883) internal successors, (143), 67 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)