./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem03_label24.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label24.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V --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 c49e8ae23817aa2c6b4293aba2a0dafa15622f84ed9ad9570ae0d323ad70f2e2 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:27:06,102 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:27:06,105 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:27:06,147 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:27:06,148 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:27:06,150 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:27:06,152 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:27:06,156 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:27:06,158 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:27:06,160 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:27:06,162 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:27:06,164 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:27:06,166 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:27:06,171 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:27:06,174 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:27:06,178 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:27:06,182 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:27:06,190 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:27:06,193 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:27:06,198 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:27:06,207 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:27:06,209 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:27:06,211 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:27:06,214 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:27:06,219 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:27:06,222 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:27:06,222 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:27:06,225 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:27:06,226 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:27:06,228 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:27:06,229 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:27:06,231 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:27:06,233 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:27:06,235 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:27:06,237 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:27:06,238 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:27:06,239 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:27:06,239 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:27:06,240 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:27:06,241 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:27:06,242 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:27:06,243 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:27:06,304 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:27:06,305 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:27:06,305 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:27:06,306 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:27:06,307 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:27:06,315 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:27:06,315 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:27:06,315 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:27:06,316 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:27:06,316 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:27:06,317 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:27:06,318 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:27:06,318 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:27:06,318 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:27:06,318 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:27:06,319 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:27:06,319 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:27:06,319 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:27:06,320 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:27:06,321 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:27:06,321 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:27:06,321 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:27:06,321 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:27:06,322 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:27:06,322 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:27:06,322 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:27:06,323 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:27:06,323 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:27:06,323 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:27:06,324 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:27:06,324 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:27:06,324 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:27:06,325 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:27:06,325 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:27:06,325 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:27:06,326 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:27:06,326 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:27:06,326 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:27:06,326 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:27:06,327 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:27:06,327 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:27:06,327 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_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c49e8ae23817aa2c6b4293aba2a0dafa15622f84ed9ad9570ae0d323ad70f2e2 [2021-11-23 03:27:06,634 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:27:06,670 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:27:06,673 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:27:06,674 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:27:06,675 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:27:06,677 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/eca-rers2012/Problem03_label24.c [2021-11-23 03:27:06,788 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/data/4a28c6bec/6e42e6ecf8cf400a981fc26c6d4384ff/FLAG1b14406c6 [2021-11-23 03:27:07,716 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:27:07,717 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/sv-benchmarks/c/eca-rers2012/Problem03_label24.c [2021-11-23 03:27:07,750 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/data/4a28c6bec/6e42e6ecf8cf400a981fc26c6d4384ff/FLAG1b14406c6 [2021-11-23 03:27:08,238 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/data/4a28c6bec/6e42e6ecf8cf400a981fc26c6d4384ff [2021-11-23 03:27:08,241 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:27:08,242 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:27:08,259 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:27:08,259 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:27:08,262 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:27:08,263 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:27:08" (1/1) ... [2021-11-23 03:27:08,264 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27da203 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:27:08, skipping insertion in model container [2021-11-23 03:27:08,264 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:27:08" (1/1) ... [2021-11-23 03:27:08,273 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:27:08,375 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:27:09,151 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_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/sv-benchmarks/c/eca-rers2012/Problem03_label24.c[60015,60028] [2021-11-23 03:27:09,192 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:27:09,206 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:27:09,632 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_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/sv-benchmarks/c/eca-rers2012/Problem03_label24.c[60015,60028] [2021-11-23 03:27:09,641 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:27:09,664 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:27:09,664 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:27:09 WrapperNode [2021-11-23 03:27:09,665 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:27:09,666 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:27:09,666 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:27:09,667 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:27:09,679 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:27:09" (1/1) ... [2021-11-23 03:27:09,744 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:27:09" (1/1) ... [2021-11-23 03:27:09,859 INFO L137 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 1771 [2021-11-23 03:27:09,860 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:27:09,860 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:27:09,861 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:27:09,861 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:27:09,870 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:27:09" (1/1) ... [2021-11-23 03:27:09,870 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:27:09" (1/1) ... [2021-11-23 03:27:09,878 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:27:09" (1/1) ... [2021-11-23 03:27:09,879 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:27:09" (1/1) ... [2021-11-23 03:27:09,931 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:27:09" (1/1) ... [2021-11-23 03:27:09,948 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:27:09" (1/1) ... [2021-11-23 03:27:09,970 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:27:09" (1/1) ... [2021-11-23 03:27:09,988 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:27:09,989 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:27:09,990 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:27:09,990 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:27:09,991 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:27:09" (1/1) ... [2021-11-23 03:27:10,001 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:27:10,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:27:10,036 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:27:10,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:27:10,125 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:27:10,125 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:27:10,126 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:27:10,126 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:27:10,220 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:27:10,222 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:27:12,208 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:27:12,523 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:27:12,523 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 03:27:12,527 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:27:12 BoogieIcfgContainer [2021-11-23 03:27:12,527 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:27:12,529 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:27:12,529 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:27:12,533 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:27:12,533 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:27:08" (1/3) ... [2021-11-23 03:27:12,534 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f1d75d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:27:12, skipping insertion in model container [2021-11-23 03:27:12,535 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:27:09" (2/3) ... [2021-11-23 03:27:12,535 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f1d75d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:27:12, skipping insertion in model container [2021-11-23 03:27:12,535 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:27:12" (3/3) ... [2021-11-23 03:27:12,537 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem03_label24.c [2021-11-23 03:27:12,543 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:27:12,543 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:27:12,602 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:27:12,610 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 [2021-11-23 03:27:12,610 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:27:12,631 INFO L276 IsEmpty]: Start isEmpty. Operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:12,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-23 03:27:12,648 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:12,649 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:12,649 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:12,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:12,656 INFO L85 PathProgramCache]: Analyzing trace with hash -1724854469, now seen corresponding path program 1 times [2021-11-23 03:27:12,667 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:12,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [773680890] [2021-11-23 03:27:12,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:12,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:12,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:13,403 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:27:13,403 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:13,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [773680890] [2021-11-23 03:27:13,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [773680890] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:27:13,405 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:27:13,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:27:13,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778350303] [2021-11-23 03:27:13,409 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:27:13,414 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:27:13,415 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:13,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:27:13,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:13,453 INFO L87 Difference]: Start difference. First operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 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 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 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) [2021-11-23 03:27:14,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:14,720 INFO L93 Difference]: Finished difference Result 440 states and 860 transitions. [2021-11-23 03:27:14,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:27:14,723 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 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) Word has length 143 [2021-11-23 03:27:14,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:14,753 INFO L225 Difference]: With dead ends: 440 [2021-11-23 03:27:14,753 INFO L226 Difference]: Without dead ends: 289 [2021-11-23 03:27:14,758 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:14,765 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 12 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:14,767 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 37 Invalid, 624 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 03:27:14,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-23 03:27:14,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2021-11-23 03:27:14,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.8576388888888888) internal successors, (535), 288 states have internal predecessors, (535), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:14,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 535 transitions. [2021-11-23 03:27:14,858 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 535 transitions. Word has length 143 [2021-11-23 03:27:14,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:14,862 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 535 transitions. [2021-11-23 03:27:14,862 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 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) [2021-11-23 03:27:14,862 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 535 transitions. [2021-11-23 03:27:14,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-23 03:27:14,877 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:14,878 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:14,878 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:27:14,879 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:14,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:14,883 INFO L85 PathProgramCache]: Analyzing trace with hash 1067675039, now seen corresponding path program 1 times [2021-11-23 03:27:14,883 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:14,884 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202544465] [2021-11-23 03:27:14,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:14,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:14,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:15,010 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:27:15,011 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:15,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202544465] [2021-11-23 03:27:15,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [202544465] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:27:15,012 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:27:15,012 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:27:15,012 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121828276] [2021-11-23 03:27:15,012 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:27:15,014 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:27:15,014 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:15,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:27:15,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:15,016 INFO L87 Difference]: Start difference. First operand 289 states and 535 transitions. Second operand has 3 states, 3 states have (on average 49.666666666666664) internal successors, (149), 2 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:15,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:15,954 INFO L93 Difference]: Finished difference Result 863 states and 1602 transitions. [2021-11-23 03:27:15,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:27:15,955 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 49.666666666666664) internal successors, (149), 2 states have internal predecessors, (149), 0 states have call successors, (0), 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 149 [2021-11-23 03:27:15,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:15,959 INFO L225 Difference]: With dead ends: 863 [2021-11-23 03:27:15,959 INFO L226 Difference]: Without dead ends: 575 [2021-11-23 03:27:15,961 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:15,965 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 150 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 451 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 574 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 451 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:15,966 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 97 Invalid, 574 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 451 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 03:27:15,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-23 03:27:15,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 575. [2021-11-23 03:27:15,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.543554006968641) internal successors, (886), 574 states have internal predecessors, (886), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:16,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 886 transitions. [2021-11-23 03:27:16,001 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 886 transitions. Word has length 149 [2021-11-23 03:27:16,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:16,005 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 886 transitions. [2021-11-23 03:27:16,006 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 49.666666666666664) internal successors, (149), 2 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:16,006 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 886 transitions. [2021-11-23 03:27:16,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-23 03:27:16,010 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:16,010 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:16,011 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:27:16,011 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:16,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:16,018 INFO L85 PathProgramCache]: Analyzing trace with hash 1008651774, now seen corresponding path program 1 times [2021-11-23 03:27:16,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:16,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [171609496] [2021-11-23 03:27:16,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:16,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:16,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:16,146 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:27:16,150 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:16,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [171609496] [2021-11-23 03:27:16,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [171609496] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:27:16,152 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:27:16,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:27:16,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759374497] [2021-11-23 03:27:16,153 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:27:16,154 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:27:16,156 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:16,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:27:16,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:16,158 INFO L87 Difference]: Start difference. First operand 575 states and 886 transitions. Second operand has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:17,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:17,180 INFO L93 Difference]: Finished difference Result 1721 states and 2655 transitions. [2021-11-23 03:27:17,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:27:17,181 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 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 157 [2021-11-23 03:27:17,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:17,203 INFO L225 Difference]: With dead ends: 1721 [2021-11-23 03:27:17,203 INFO L226 Difference]: Without dead ends: 1147 [2021-11-23 03:27:17,206 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:17,214 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 159 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 453 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 621 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 453 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:17,215 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 26 Invalid, 621 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 453 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-23 03:27:17,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1147 states. [2021-11-23 03:27:17,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1147 to 1147. [2021-11-23 03:27:17,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1147 states, 1146 states have (on average 1.506108202443281) internal successors, (1726), 1146 states have internal predecessors, (1726), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:17,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1147 states to 1147 states and 1726 transitions. [2021-11-23 03:27:17,299 INFO L78 Accepts]: Start accepts. Automaton has 1147 states and 1726 transitions. Word has length 157 [2021-11-23 03:27:17,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:17,299 INFO L470 AbstractCegarLoop]: Abstraction has 1147 states and 1726 transitions. [2021-11-23 03:27:17,300 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:17,300 INFO L276 IsEmpty]: Start isEmpty. Operand 1147 states and 1726 transitions. [2021-11-23 03:27:17,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-23 03:27:17,308 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:17,308 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:17,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 03:27:17,309 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:17,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:17,310 INFO L85 PathProgramCache]: Analyzing trace with hash -558530655, now seen corresponding path program 1 times [2021-11-23 03:27:17,310 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:17,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [984068564] [2021-11-23 03:27:17,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:17,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:17,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:17,448 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:27:17,448 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:17,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [984068564] [2021-11-23 03:27:17,448 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [984068564] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:27:17,449 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:27:17,449 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:27:17,449 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052411318] [2021-11-23 03:27:17,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:27:17,450 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:27:17,450 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:17,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:27:17,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:17,451 INFO L87 Difference]: Start difference. First operand 1147 states and 1726 transitions. Second operand has 3 states, 3 states have (on average 53.0) internal successors, (159), 3 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:18,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:18,374 INFO L93 Difference]: Finished difference Result 2865 states and 4491 transitions. [2021-11-23 03:27:18,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:27:18,375 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 53.0) internal successors, (159), 3 states have internal predecessors, (159), 0 states have call successors, (0), 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 164 [2021-11-23 03:27:18,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:18,389 INFO L225 Difference]: With dead ends: 2865 [2021-11-23 03:27:18,389 INFO L226 Difference]: Without dead ends: 1719 [2021-11-23 03:27:18,391 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:18,393 INFO L933 BasicCegarLoop]: 257 mSDtfsCounter, 152 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 408 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 260 SdHoareTripleChecker+Invalid, 569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:18,394 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 260 Invalid, 569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 408 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 03:27:18,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1719 states. [2021-11-23 03:27:18,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1719 to 1719. [2021-11-23 03:27:18,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1719 states, 1718 states have (on average 1.420256111757858) internal successors, (2440), 1718 states have internal predecessors, (2440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:18,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1719 states to 1719 states and 2440 transitions. [2021-11-23 03:27:18,460 INFO L78 Accepts]: Start accepts. Automaton has 1719 states and 2440 transitions. Word has length 164 [2021-11-23 03:27:18,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:18,460 INFO L470 AbstractCegarLoop]: Abstraction has 1719 states and 2440 transitions. [2021-11-23 03:27:18,461 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 53.0) internal successors, (159), 3 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:18,461 INFO L276 IsEmpty]: Start isEmpty. Operand 1719 states and 2440 transitions. [2021-11-23 03:27:18,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2021-11-23 03:27:18,467 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:18,467 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:18,467 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 03:27:18,468 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:18,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:18,468 INFO L85 PathProgramCache]: Analyzing trace with hash 1951313005, now seen corresponding path program 1 times [2021-11-23 03:27:18,469 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:18,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1354954096] [2021-11-23 03:27:18,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:18,469 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:18,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:18,574 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:27:18,575 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:18,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1354954096] [2021-11-23 03:27:18,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1354954096] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:27:18,576 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:27:18,576 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:27:18,576 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619226550] [2021-11-23 03:27:18,577 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:27:18,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:27:18,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:18,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:27:18,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:18,579 INFO L87 Difference]: Start difference. First operand 1719 states and 2440 transitions. Second operand has 3 states, 3 states have (on average 55.333333333333336) internal successors, (166), 3 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:19,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:19,531 INFO L93 Difference]: Finished difference Result 4295 states and 6074 transitions. [2021-11-23 03:27:19,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:27:19,532 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 55.333333333333336) internal successors, (166), 3 states have internal predecessors, (166), 0 states have call successors, (0), 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 171 [2021-11-23 03:27:19,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:19,549 INFO L225 Difference]: With dead ends: 4295 [2021-11-23 03:27:19,549 INFO L226 Difference]: Without dead ends: 2577 [2021-11-23 03:27:19,552 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:19,554 INFO L933 BasicCegarLoop]: 261 mSDtfsCounter, 132 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 449 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:19,554 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 265 Invalid, 578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 449 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 03:27:19,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2577 states. [2021-11-23 03:27:19,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2577 to 2577. [2021-11-23 03:27:19,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2577 states, 2576 states have (on average 1.3423913043478262) internal successors, (3458), 2576 states have internal predecessors, (3458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:19,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2577 states to 2577 states and 3458 transitions. [2021-11-23 03:27:19,645 INFO L78 Accepts]: Start accepts. Automaton has 2577 states and 3458 transitions. Word has length 171 [2021-11-23 03:27:19,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:19,646 INFO L470 AbstractCegarLoop]: Abstraction has 2577 states and 3458 transitions. [2021-11-23 03:27:19,646 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 55.333333333333336) internal successors, (166), 3 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:19,646 INFO L276 IsEmpty]: Start isEmpty. Operand 2577 states and 3458 transitions. [2021-11-23 03:27:19,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-11-23 03:27:19,654 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:19,654 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:19,654 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 03:27:19,655 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:19,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:19,655 INFO L85 PathProgramCache]: Analyzing trace with hash -674886392, now seen corresponding path program 1 times [2021-11-23 03:27:19,656 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:19,656 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587986094] [2021-11-23 03:27:19,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:19,656 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:19,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:19,765 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:27:19,765 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:19,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587986094] [2021-11-23 03:27:19,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1587986094] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:27:19,766 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:27:19,766 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:27:19,766 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63299733] [2021-11-23 03:27:19,766 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:27:19,767 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:27:19,767 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:19,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:27:19,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:27:19,769 INFO L87 Difference]: Start difference. First operand 2577 states and 3458 transitions. Second operand has 4 states, 4 states have (on average 46.75) internal successors, (187), 3 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:21,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:21,258 INFO L93 Difference]: Finished difference Result 5582 states and 7511 transitions. [2021-11-23 03:27:21,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:27:21,259 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 46.75) internal successors, (187), 3 states have internal predecessors, (187), 0 states have call successors, (0), 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 187 [2021-11-23 03:27:21,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:21,280 INFO L225 Difference]: With dead ends: 5582 [2021-11-23 03:27:21,280 INFO L226 Difference]: Without dead ends: 3006 [2021-11-23 03:27:21,284 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:27:21,288 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 261 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 872 mSolverCounterSat, 265 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 1137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 265 IncrementalHoareTripleChecker+Valid, 872 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:21,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [261 Valid, 94 Invalid, 1137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [265 Valid, 872 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-23 03:27:21,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3006 states. [2021-11-23 03:27:21,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3006 to 2577. [2021-11-23 03:27:21,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2577 states, 2576 states have (on average 1.3423913043478262) internal successors, (3458), 2576 states have internal predecessors, (3458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:21,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2577 states to 2577 states and 3458 transitions. [2021-11-23 03:27:21,387 INFO L78 Accepts]: Start accepts. Automaton has 2577 states and 3458 transitions. Word has length 187 [2021-11-23 03:27:21,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:21,388 INFO L470 AbstractCegarLoop]: Abstraction has 2577 states and 3458 transitions. [2021-11-23 03:27:21,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 46.75) internal successors, (187), 3 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:21,388 INFO L276 IsEmpty]: Start isEmpty. Operand 2577 states and 3458 transitions. [2021-11-23 03:27:21,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2021-11-23 03:27:21,396 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:21,397 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:21,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 03:27:21,397 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:21,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:21,398 INFO L85 PathProgramCache]: Analyzing trace with hash -1836548245, now seen corresponding path program 1 times [2021-11-23 03:27:21,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:21,398 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570609787] [2021-11-23 03:27:21,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:21,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:21,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:21,539 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 56 proven. 6 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 03:27:21,540 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:21,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570609787] [2021-11-23 03:27:21,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570609787] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:27:21,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1968910935] [2021-11-23 03:27:21,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:21,541 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:27:21,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:27:21,546 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:27:21,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:27:21,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:21,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:27:21,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:27:22,293 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 03:27:22,293 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:27:22,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1968910935] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:27:22,294 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:27:22,294 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-23 03:27:22,295 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52187580] [2021-11-23 03:27:22,295 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:27:22,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:27:22,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:22,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:27:22,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:27:22,299 INFO L87 Difference]: Start difference. First operand 2577 states and 3458 transitions. Second operand has 3 states, 3 states have (on average 59.0) internal successors, (177), 3 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:23,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:23,223 INFO L93 Difference]: Finished difference Result 5868 states and 7985 transitions. [2021-11-23 03:27:23,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:27:23,224 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.0) internal successors, (177), 3 states have internal predecessors, (177), 0 states have call successors, (0), 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 194 [2021-11-23 03:27:23,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:23,245 INFO L225 Difference]: With dead ends: 5868 [2021-11-23 03:27:23,245 INFO L226 Difference]: Without dead ends: 3292 [2021-11-23 03:27:23,249 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 193 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:27:23,250 INFO L933 BasicCegarLoop]: 248 mSDtfsCounter, 9 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 577 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 637 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 577 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:23,251 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 252 Invalid, 637 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 577 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 03:27:23,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3292 states. [2021-11-23 03:27:23,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3292 to 3292. [2021-11-23 03:27:23,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3292 states, 3291 states have (on average 1.3585536311151625) internal successors, (4471), 3291 states have internal predecessors, (4471), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:23,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3292 states to 3292 states and 4471 transitions. [2021-11-23 03:27:23,342 INFO L78 Accepts]: Start accepts. Automaton has 3292 states and 4471 transitions. Word has length 194 [2021-11-23 03:27:23,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:23,343 INFO L470 AbstractCegarLoop]: Abstraction has 3292 states and 4471 transitions. [2021-11-23 03:27:23,343 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.0) internal successors, (177), 3 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:23,344 INFO L276 IsEmpty]: Start isEmpty. Operand 3292 states and 4471 transitions. [2021-11-23 03:27:23,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2021-11-23 03:27:23,352 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:23,353 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:23,391 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:27:23,566 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-23 03:27:23,567 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:23,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:23,567 INFO L85 PathProgramCache]: Analyzing trace with hash 686218151, now seen corresponding path program 1 times [2021-11-23 03:27:23,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:23,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1856074229] [2021-11-23 03:27:23,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:23,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:23,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:23,658 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 03:27:23,659 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:23,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1856074229] [2021-11-23 03:27:23,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1856074229] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:27:23,659 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:27:23,659 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:27:23,660 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604492071] [2021-11-23 03:27:23,660 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:27:23,660 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:27:23,661 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:23,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:27:23,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:23,662 INFO L87 Difference]: Start difference. First operand 3292 states and 4471 transitions. Second operand has 3 states, 3 states have (on average 57.666666666666664) internal successors, (173), 2 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:24,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:24,529 INFO L93 Difference]: Finished difference Result 9586 states and 13061 transitions. [2021-11-23 03:27:24,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:27:24,530 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.666666666666664) internal successors, (173), 2 states have internal predecessors, (173), 0 states have call successors, (0), 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 195 [2021-11-23 03:27:24,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:24,571 INFO L225 Difference]: With dead ends: 9586 [2021-11-23 03:27:24,572 INFO L226 Difference]: Without dead ends: 6438 [2021-11-23 03:27:24,577 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:24,579 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 135 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 537 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 537 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:24,580 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 98 Invalid, 623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 537 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 03:27:24,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6438 states. [2021-11-23 03:27:24,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6438 to 6438. [2021-11-23 03:27:24,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6438 states, 6437 states have (on average 1.319092745067578) internal successors, (8491), 6437 states have internal predecessors, (8491), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:24,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6438 states to 6438 states and 8491 transitions. [2021-11-23 03:27:24,749 INFO L78 Accepts]: Start accepts. Automaton has 6438 states and 8491 transitions. Word has length 195 [2021-11-23 03:27:24,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:24,749 INFO L470 AbstractCegarLoop]: Abstraction has 6438 states and 8491 transitions. [2021-11-23 03:27:24,750 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.666666666666664) internal successors, (173), 2 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:24,750 INFO L276 IsEmpty]: Start isEmpty. Operand 6438 states and 8491 transitions. [2021-11-23 03:27:24,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2021-11-23 03:27:24,765 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:24,765 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:24,765 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 03:27:24,766 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:24,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:24,766 INFO L85 PathProgramCache]: Analyzing trace with hash 1110744859, now seen corresponding path program 1 times [2021-11-23 03:27:24,766 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:24,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [72101754] [2021-11-23 03:27:24,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:24,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:24,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:24,833 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-23 03:27:24,833 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:24,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [72101754] [2021-11-23 03:27:24,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [72101754] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:27:24,834 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:27:24,834 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:27:24,834 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758412283] [2021-11-23 03:27:24,834 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:27:24,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:27:24,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:24,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:27:24,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:24,866 INFO L87 Difference]: Start difference. First operand 6438 states and 8491 transitions. Second operand has 3 states, 3 states have (on average 53.0) internal successors, (159), 2 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:25,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:25,664 INFO L93 Difference]: Finished difference Result 17453 states and 23183 transitions. [2021-11-23 03:27:25,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:27:25,665 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 53.0) internal successors, (159), 2 states have internal predecessors, (159), 0 states have call successors, (0), 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 208 [2021-11-23 03:27:25,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:25,719 INFO L225 Difference]: With dead ends: 17453 [2021-11-23 03:27:25,719 INFO L226 Difference]: Without dead ends: 11302 [2021-11-23 03:27:25,729 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:25,729 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 158 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 500 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 589 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 500 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:25,730 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 63 Invalid, 589 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 500 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 03:27:25,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11302 states. [2021-11-23 03:27:25,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11302 to 10871. [2021-11-23 03:27:26,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10871 states, 10870 states have (on average 1.2883164673413063) internal successors, (14004), 10870 states have internal predecessors, (14004), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:26,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10871 states to 10871 states and 14004 transitions. [2021-11-23 03:27:26,053 INFO L78 Accepts]: Start accepts. Automaton has 10871 states and 14004 transitions. Word has length 208 [2021-11-23 03:27:26,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:26,053 INFO L470 AbstractCegarLoop]: Abstraction has 10871 states and 14004 transitions. [2021-11-23 03:27:26,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 53.0) internal successors, (159), 2 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:26,054 INFO L276 IsEmpty]: Start isEmpty. Operand 10871 states and 14004 transitions. [2021-11-23 03:27:26,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2021-11-23 03:27:26,076 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:26,077 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:26,077 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 03:27:26,077 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:26,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:26,078 INFO L85 PathProgramCache]: Analyzing trace with hash -1892094538, now seen corresponding path program 1 times [2021-11-23 03:27:26,078 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:26,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224691685] [2021-11-23 03:27:26,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:26,079 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:26,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:26,188 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 74 proven. 6 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 03:27:26,189 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:26,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224691685] [2021-11-23 03:27:26,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [224691685] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:27:26,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1257024038] [2021-11-23 03:27:26,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:26,190 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:27:26,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:27:26,191 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:27:26,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:27:26,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:26,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 504 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:27:26,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:27:26,728 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 108 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:27:26,728 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:27:26,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1257024038] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:27:26,728 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:27:26,729 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-23 03:27:26,729 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27344631] [2021-11-23 03:27:26,729 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:27:26,730 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:27:26,730 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:26,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:27:26,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:27:26,731 INFO L87 Difference]: Start difference. First operand 10871 states and 14004 transitions. Second operand has 3 states, 3 states have (on average 70.0) internal successors, (210), 3 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:27,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:27,588 INFO L93 Difference]: Finished difference Result 24315 states and 31593 transitions. [2021-11-23 03:27:27,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:27:27,588 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 70.0) internal successors, (210), 3 states have internal predecessors, (210), 0 states have call successors, (0), 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 215 [2021-11-23 03:27:27,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:27,616 INFO L225 Difference]: With dead ends: 24315 [2021-11-23 03:27:27,616 INFO L226 Difference]: Without dead ends: 13731 [2021-11-23 03:27:27,628 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 214 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:27:27,629 INFO L933 BasicCegarLoop]: 254 mSDtfsCounter, 121 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 478 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 598 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:27,629 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 257 Invalid, 598 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 478 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 03:27:27,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13731 states. [2021-11-23 03:27:27,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13731 to 13588. [2021-11-23 03:27:27,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13588 states, 13587 states have (on average 1.2667255464782512) internal successors, (17211), 13587 states have internal predecessors, (17211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:27,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13588 states to 13588 states and 17211 transitions. [2021-11-23 03:27:27,909 INFO L78 Accepts]: Start accepts. Automaton has 13588 states and 17211 transitions. Word has length 215 [2021-11-23 03:27:27,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:27,910 INFO L470 AbstractCegarLoop]: Abstraction has 13588 states and 17211 transitions. [2021-11-23 03:27:27,910 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 70.0) internal successors, (210), 3 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:27,910 INFO L276 IsEmpty]: Start isEmpty. Operand 13588 states and 17211 transitions. [2021-11-23 03:27:27,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2021-11-23 03:27:27,996 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:27,996 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:28,038 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:27:28,210 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 03:27:28,211 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:28,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:28,211 INFO L85 PathProgramCache]: Analyzing trace with hash -1497095293, now seen corresponding path program 1 times [2021-11-23 03:27:28,211 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:28,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [839518263] [2021-11-23 03:27:28,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:28,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:28,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:28,315 INFO L134 CoverageAnalysis]: Checked inductivity of 191 backedges. 103 proven. 0 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2021-11-23 03:27:28,315 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:28,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [839518263] [2021-11-23 03:27:28,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [839518263] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:27:28,316 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:27:28,316 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:27:28,316 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321305648] [2021-11-23 03:27:28,317 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:27:28,317 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:27:28,317 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:28,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:27:28,318 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:27:28,318 INFO L87 Difference]: Start difference. First operand 13588 states and 17211 transitions. Second operand has 4 states, 4 states have (on average 41.5) internal successors, (166), 3 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:29,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:29,229 INFO L93 Difference]: Finished difference Result 25888 states and 33003 transitions. [2021-11-23 03:27:29,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:27:29,230 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 41.5) internal successors, (166), 3 states have internal predecessors, (166), 0 states have call successors, (0), 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 220 [2021-11-23 03:27:29,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:29,254 INFO L225 Difference]: With dead ends: 25888 [2021-11-23 03:27:29,254 INFO L226 Difference]: Without dead ends: 12587 [2021-11-23 03:27:29,269 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:27:29,270 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 306 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 653 mSolverCounterSat, 178 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 306 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 831 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 178 IncrementalHoareTripleChecker+Valid, 653 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:29,271 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [306 Valid, 11 Invalid, 831 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [178 Valid, 653 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 03:27:29,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12587 states. [2021-11-23 03:27:29,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12587 to 12587. [2021-11-23 03:27:29,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12587 states, 12586 states have (on average 1.2145240743683459) internal successors, (15286), 12586 states have internal predecessors, (15286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:29,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12587 states to 12587 states and 15286 transitions. [2021-11-23 03:27:29,565 INFO L78 Accepts]: Start accepts. Automaton has 12587 states and 15286 transitions. Word has length 220 [2021-11-23 03:27:29,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:29,566 INFO L470 AbstractCegarLoop]: Abstraction has 12587 states and 15286 transitions. [2021-11-23 03:27:29,567 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 41.5) internal successors, (166), 3 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:29,567 INFO L276 IsEmpty]: Start isEmpty. Operand 12587 states and 15286 transitions. [2021-11-23 03:27:29,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2021-11-23 03:27:29,583 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:29,583 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:29,583 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-23 03:27:29,584 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:29,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:29,584 INFO L85 PathProgramCache]: Analyzing trace with hash 208782876, now seen corresponding path program 1 times [2021-11-23 03:27:29,584 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:29,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [517683919] [2021-11-23 03:27:29,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:29,585 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:29,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:29,767 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 79 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:27:29,767 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:29,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [517683919] [2021-11-23 03:27:29,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [517683919] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:27:29,768 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:27:29,768 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:27:29,768 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741301954] [2021-11-23 03:27:29,768 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:27:29,769 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:27:29,769 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:29,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:27:29,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:29,770 INFO L87 Difference]: Start difference. First operand 12587 states and 15286 transitions. Second operand has 3 states, 3 states have (on average 73.0) internal successors, (219), 2 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:30,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:30,509 INFO L93 Difference]: Finished difference Result 28464 states and 34647 transitions. [2021-11-23 03:27:30,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:27:30,510 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 73.0) internal successors, (219), 2 states have internal predecessors, (219), 0 states have call successors, (0), 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 224 [2021-11-23 03:27:30,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:30,543 INFO L225 Difference]: With dead ends: 28464 [2021-11-23 03:27:30,543 INFO L226 Difference]: Without dead ends: 16164 [2021-11-23 03:27:30,559 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:30,560 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 86 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 528 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 539 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:30,560 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 69 Invalid, 539 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 528 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:27:30,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16164 states. [2021-11-23 03:27:30,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16164 to 15161. [2021-11-23 03:27:30,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15161 states, 15160 states have (on average 1.2255277044854882) internal successors, (18579), 15160 states have internal predecessors, (18579), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:30,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15161 states to 15161 states and 18579 transitions. [2021-11-23 03:27:30,901 INFO L78 Accepts]: Start accepts. Automaton has 15161 states and 18579 transitions. Word has length 224 [2021-11-23 03:27:30,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:30,901 INFO L470 AbstractCegarLoop]: Abstraction has 15161 states and 18579 transitions. [2021-11-23 03:27:30,902 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 73.0) internal successors, (219), 2 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:30,902 INFO L276 IsEmpty]: Start isEmpty. Operand 15161 states and 18579 transitions. [2021-11-23 03:27:30,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2021-11-23 03:27:30,922 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:30,923 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:30,924 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 03:27:30,924 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:30,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:30,925 INFO L85 PathProgramCache]: Analyzing trace with hash -1547515862, now seen corresponding path program 1 times [2021-11-23 03:27:30,925 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:30,925 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1563526215] [2021-11-23 03:27:30,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:30,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:30,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:31,062 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 111 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:27:31,065 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:31,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1563526215] [2021-11-23 03:27:31,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1563526215] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:27:31,065 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:27:31,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:27:31,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954283773] [2021-11-23 03:27:31,066 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:27:31,066 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:27:31,066 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:31,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:27:31,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:27:31,067 INFO L87 Difference]: Start difference. First operand 15161 states and 18579 transitions. Second operand has 4 states, 4 states have (on average 61.0) internal successors, (244), 3 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:32,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:32,425 INFO L93 Difference]: Finished difference Result 30321 states and 37250 transitions. [2021-11-23 03:27:32,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:27:32,426 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 61.0) internal successors, (244), 3 states have internal predecessors, (244), 0 states have call successors, (0), 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 249 [2021-11-23 03:27:32,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:32,453 INFO L225 Difference]: With dead ends: 30321 [2021-11-23 03:27:32,453 INFO L226 Difference]: Without dead ends: 15161 [2021-11-23 03:27:32,466 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:27:32,467 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 214 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 795 mSolverCounterSat, 275 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 1070 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 275 IncrementalHoareTripleChecker+Valid, 795 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:32,468 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [214 Valid, 28 Invalid, 1070 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [275 Valid, 795 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-23 03:27:32,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15161 states. [2021-11-23 03:27:32,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15161 to 14017. [2021-11-23 03:27:32,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14017 states, 14016 states have (on average 1.1531107305936072) internal successors, (16162), 14016 states have internal predecessors, (16162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:32,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14017 states to 14017 states and 16162 transitions. [2021-11-23 03:27:32,744 INFO L78 Accepts]: Start accepts. Automaton has 14017 states and 16162 transitions. Word has length 249 [2021-11-23 03:27:32,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:32,745 INFO L470 AbstractCegarLoop]: Abstraction has 14017 states and 16162 transitions. [2021-11-23 03:27:32,745 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 61.0) internal successors, (244), 3 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:32,745 INFO L276 IsEmpty]: Start isEmpty. Operand 14017 states and 16162 transitions. [2021-11-23 03:27:32,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2021-11-23 03:27:32,819 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:32,819 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:32,819 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 03:27:32,820 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:32,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:32,821 INFO L85 PathProgramCache]: Analyzing trace with hash -998155077, now seen corresponding path program 1 times [2021-11-23 03:27:32,821 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:32,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593866300] [2021-11-23 03:27:32,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:32,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:32,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:32,925 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2021-11-23 03:27:32,925 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:32,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593866300] [2021-11-23 03:27:32,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [593866300] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:27:32,926 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:27:32,926 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:27:32,929 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400421482] [2021-11-23 03:27:32,929 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:27:32,930 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:27:32,930 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:32,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:27:32,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:32,931 INFO L87 Difference]: Start difference. First operand 14017 states and 16162 transitions. Second operand has 3 states, 3 states have (on average 58.333333333333336) internal successors, (175), 2 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:33,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:33,698 INFO L93 Difference]: Finished difference Result 33040 states and 38048 transitions. [2021-11-23 03:27:33,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:27:33,699 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 58.333333333333336) internal successors, (175), 2 states have internal predecessors, (175), 0 states have call successors, (0), 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 254 [2021-11-23 03:27:33,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:33,735 INFO L225 Difference]: With dead ends: 33040 [2021-11-23 03:27:33,735 INFO L226 Difference]: Without dead ends: 19453 [2021-11-23 03:27:33,747 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:33,748 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 128 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 473 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 473 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:33,748 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [128 Valid, 71 Invalid, 485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 473 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:27:33,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19453 states. [2021-11-23 03:27:34,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19453 to 19451. [2021-11-23 03:27:34,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19451 states, 19450 states have (on average 1.1451928020565552) internal successors, (22274), 19450 states have internal predecessors, (22274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:34,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19451 states to 19451 states and 22274 transitions. [2021-11-23 03:27:34,200 INFO L78 Accepts]: Start accepts. Automaton has 19451 states and 22274 transitions. Word has length 254 [2021-11-23 03:27:34,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:34,201 INFO L470 AbstractCegarLoop]: Abstraction has 19451 states and 22274 transitions. [2021-11-23 03:27:34,201 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 58.333333333333336) internal successors, (175), 2 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:34,201 INFO L276 IsEmpty]: Start isEmpty. Operand 19451 states and 22274 transitions. [2021-11-23 03:27:34,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2021-11-23 03:27:34,222 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:34,223 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:34,224 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 03:27:34,224 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:34,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:34,225 INFO L85 PathProgramCache]: Analyzing trace with hash -1608179180, now seen corresponding path program 1 times [2021-11-23 03:27:34,225 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:34,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [423073000] [2021-11-23 03:27:34,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:34,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:34,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:34,376 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 111 proven. 6 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2021-11-23 03:27:34,377 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:34,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [423073000] [2021-11-23 03:27:34,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [423073000] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:27:34,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [300597826] [2021-11-23 03:27:34,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:34,378 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:27:34,381 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:27:34,382 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:27:34,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:27:34,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:34,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 599 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:27:34,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:27:35,081 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 162 proven. 0 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-23 03:27:35,082 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:27:35,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [300597826] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:27:35,082 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:27:35,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-23 03:27:35,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437922737] [2021-11-23 03:27:35,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:27:35,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:27:35,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:35,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:27:35,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:27:35,085 INFO L87 Difference]: Start difference. First operand 19451 states and 22274 transitions. Second operand has 3 states, 3 states have (on average 67.0) internal successors, (201), 3 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:35,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:35,772 INFO L93 Difference]: Finished difference Result 40903 states and 47162 transitions. [2021-11-23 03:27:35,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:27:35,773 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 67.0) internal successors, (201), 3 states have internal predecessors, (201), 0 states have call successors, (0), 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 269 [2021-11-23 03:27:35,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:35,809 INFO L225 Difference]: With dead ends: 40903 [2021-11-23 03:27:35,809 INFO L226 Difference]: Without dead ends: 22740 [2021-11-23 03:27:35,823 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 268 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:27:35,826 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 33 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 405 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 454 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 405 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:35,826 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 64 Invalid, 454 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 405 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:27:35,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22740 states. [2021-11-23 03:27:36,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22740 to 21739. [2021-11-23 03:27:36,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21739 states, 21738 states have (on average 1.1459655902106909) internal successors, (24911), 21738 states have internal predecessors, (24911), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:36,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21739 states to 21739 states and 24911 transitions. [2021-11-23 03:27:36,169 INFO L78 Accepts]: Start accepts. Automaton has 21739 states and 24911 transitions. Word has length 269 [2021-11-23 03:27:36,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:36,170 INFO L470 AbstractCegarLoop]: Abstraction has 21739 states and 24911 transitions. [2021-11-23 03:27:36,170 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 67.0) internal successors, (201), 3 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:36,171 INFO L276 IsEmpty]: Start isEmpty. Operand 21739 states and 24911 transitions. [2021-11-23 03:27:36,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2021-11-23 03:27:36,184 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:36,185 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:36,225 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:27:36,402 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:27:36,403 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:36,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:36,403 INFO L85 PathProgramCache]: Analyzing trace with hash -342144761, now seen corresponding path program 1 times [2021-11-23 03:27:36,403 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:36,404 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [617867934] [2021-11-23 03:27:36,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:36,404 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:36,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:36,524 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-11-23 03:27:36,525 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:36,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [617867934] [2021-11-23 03:27:36,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [617867934] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:27:36,525 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:27:36,526 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:27:36,526 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101205318] [2021-11-23 03:27:36,526 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:27:36,527 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:27:36,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:36,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:27:36,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:36,529 INFO L87 Difference]: Start difference. First operand 21739 states and 24911 transitions. Second operand has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 2 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:37,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:37,258 INFO L93 Difference]: Finished difference Result 42476 states and 48702 transitions. [2021-11-23 03:27:37,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:27:37,258 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 2 states have internal predecessors, (178), 0 states have call successors, (0), 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 273 [2021-11-23 03:27:37,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:37,286 INFO L225 Difference]: With dead ends: 42476 [2021-11-23 03:27:37,286 INFO L226 Difference]: Without dead ends: 22883 [2021-11-23 03:27:37,299 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:27:37,300 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 117 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 400 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 405 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 400 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:37,301 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 72 Invalid, 405 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 400 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:27:37,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22883 states. [2021-11-23 03:27:37,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22883 to 22883. [2021-11-23 03:27:37,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22883 states, 22882 states have (on average 1.1412026920723712) internal successors, (26113), 22882 states have internal predecessors, (26113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:37,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22883 states to 22883 states and 26113 transitions. [2021-11-23 03:27:37,697 INFO L78 Accepts]: Start accepts. Automaton has 22883 states and 26113 transitions. Word has length 273 [2021-11-23 03:27:37,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:37,698 INFO L470 AbstractCegarLoop]: Abstraction has 22883 states and 26113 transitions. [2021-11-23 03:27:37,698 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 2 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:37,698 INFO L276 IsEmpty]: Start isEmpty. Operand 22883 states and 26113 transitions. [2021-11-23 03:27:37,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 278 [2021-11-23 03:27:37,712 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:37,712 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:37,713 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-23 03:27:37,713 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:37,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:37,714 INFO L85 PathProgramCache]: Analyzing trace with hash -1819502205, now seen corresponding path program 1 times [2021-11-23 03:27:37,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:37,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [522732729] [2021-11-23 03:27:37,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:37,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:37,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:37,968 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 133 proven. 11 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:27:37,968 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:37,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [522732729] [2021-11-23 03:27:37,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [522732729] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:27:37,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [925794332] [2021-11-23 03:27:37,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:37,970 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:27:37,970 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:27:37,975 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:27:37,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:27:38,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:38,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 561 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:27:38,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:27:38,785 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 133 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 03:27:38,785 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:27:38,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [925794332] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:27:38,786 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:27:38,786 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-23 03:27:38,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702258657] [2021-11-23 03:27:38,786 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:27:38,787 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:27:38,787 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:27:38,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:27:38,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:27:38,788 INFO L87 Difference]: Start difference. First operand 22883 states and 26113 transitions. Second operand has 3 states, 3 states have (on average 89.0) internal successors, (267), 3 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:39,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:27:39,552 INFO L93 Difference]: Finished difference Result 43048 states and 49783 transitions. [2021-11-23 03:27:39,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:27:39,553 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 89.0) internal successors, (267), 3 states have internal predecessors, (267), 0 states have call successors, (0), 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 277 [2021-11-23 03:27:39,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:27:39,576 INFO L225 Difference]: With dead ends: 43048 [2021-11-23 03:27:39,577 INFO L226 Difference]: Without dead ends: 21882 [2021-11-23 03:27:39,589 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 276 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:27:39,590 INFO L933 BasicCegarLoop]: 172 mSDtfsCounter, 42 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 417 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:27:39,591 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 176 Invalid, 466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 417 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 03:27:39,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21882 states. [2021-11-23 03:27:40,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21882 to 21596. [2021-11-23 03:27:40,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21596 states, 21595 states have (on average 1.1543412827043298) internal successors, (24928), 21595 states have internal predecessors, (24928), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:40,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21596 states to 21596 states and 24928 transitions. [2021-11-23 03:27:40,121 INFO L78 Accepts]: Start accepts. Automaton has 21596 states and 24928 transitions. Word has length 277 [2021-11-23 03:27:40,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:27:40,123 INFO L470 AbstractCegarLoop]: Abstraction has 21596 states and 24928 transitions. [2021-11-23 03:27:40,123 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 89.0) internal successors, (267), 3 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:27:40,123 INFO L276 IsEmpty]: Start isEmpty. Operand 21596 states and 24928 transitions. [2021-11-23 03:27:40,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2021-11-23 03:27:40,153 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:27:40,154 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:27:40,186 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:27:40,370 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 03:27:40,371 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:27:40,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:27:40,371 INFO L85 PathProgramCache]: Analyzing trace with hash 927804265, now seen corresponding path program 1 times [2021-11-23 03:27:40,371 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:27:40,371 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486395348] [2021-11-23 03:27:40,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:40,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:27:40,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:40,515 INFO L134 CoverageAnalysis]: Checked inductivity of 319 backedges. 111 proven. 6 refuted. 0 times theorem prover too weak. 202 trivial. 0 not checked. [2021-11-23 03:27:40,516 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:27:40,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486395348] [2021-11-23 03:27:40,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [486395348] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:27:40,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [727616613] [2021-11-23 03:27:40,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:27:40,517 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:27:40,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:27:40,523 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:27:40,546 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d241fe1b-3b4b-40d4-b833-5b979ae8cfe3/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:27:40,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:27:40,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 669 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:27:40,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:27:41,529 INFO L134 CoverageAnalysis]: Checked inductivity of 319 backedges. 205 proven. 71 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 03:27:41,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:27:42,450 INFO L134 CoverageAnalysis]: Checked inductivity of 319 backedges. 205 proven. 71 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 03:27:42,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [727616613] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:27:42,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [154597855] [2021-11-23 03:27:42,476 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2021-11-23 03:27:42,477 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:27:42,482 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:27:42,488 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:27:42,488 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs