./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/rekh_aso.1.M1-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/rekh_aso.1.M1-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 2db6eb55010ab7d3a1a946055e6deb2837efdfd8388654051519bf5d1a66e523 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:52:32,089 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:52:32,092 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:52:32,141 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:52:32,141 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:52:32,143 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:52:32,145 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:52:32,147 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:52:32,149 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:52:32,150 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:52:32,151 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:52:32,153 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:52:32,154 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:52:32,155 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:52:32,157 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:52:32,158 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:52:32,159 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:52:32,161 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:52:32,163 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:52:32,166 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:52:32,168 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:52:32,173 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:52:32,174 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:52:32,175 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:52:32,179 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:52:32,179 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:52:32,180 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:52:32,181 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:52:32,181 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:52:32,183 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:52:32,183 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:52:32,184 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:52:32,190 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:52:32,193 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:52:32,194 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:52:32,195 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:52:32,195 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:52:32,196 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:52:32,196 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:52:32,197 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:52:32,198 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:52:32,199 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:52:32,254 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:52:32,255 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:52:32,255 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:52:32,255 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:52:32,262 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:52:32,263 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:52:32,263 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:52:32,264 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:52:32,264 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:52:32,264 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:52:32,265 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:52:32,266 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:52:32,266 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:52:32,266 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:52:32,266 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:52:32,267 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:52:32,267 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:52:32,267 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:52:32,268 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:52:32,268 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:52:32,268 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:52:32,269 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:52:32,269 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:52:32,269 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:52:32,269 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:52:32,270 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:52:32,271 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:52:32,271 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:52:32,272 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:52:32,272 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:52:32,272 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:52:32,273 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:52:32,273 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:52:32,273 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:52:32,273 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:52:32,274 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:52:32,274 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:52:32,274 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:52:32,274 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:52:32,275 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:52:32,275 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:52:32,275 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_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2db6eb55010ab7d3a1a946055e6deb2837efdfd8388654051519bf5d1a66e523 [2021-11-21 01:52:32,606 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:52:32,630 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:52:32,633 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:52:32,634 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:52:32,635 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:52:32,636 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/seq-mthreaded/rekh_aso.1.M1-1.c [2021-11-21 01:52:32,705 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/data/bf0d71bef/5d7e9baf2d6244ebb5fa3e6007a3911b/FLAG1654ee505 [2021-11-21 01:52:33,465 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:52:33,466 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/sv-benchmarks/c/seq-mthreaded/rekh_aso.1.M1-1.c [2021-11-21 01:52:33,504 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/data/bf0d71bef/5d7e9baf2d6244ebb5fa3e6007a3911b/FLAG1654ee505 [2021-11-21 01:52:33,589 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/data/bf0d71bef/5d7e9baf2d6244ebb5fa3e6007a3911b [2021-11-21 01:52:33,591 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:52:33,593 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:52:33,594 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:52:33,594 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:52:33,600 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:52:33,601 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:52:33" (1/1) ... [2021-11-21 01:52:33,603 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6c0dd0e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:33, skipping insertion in model container [2021-11-21 01:52:33,604 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:52:33" (1/1) ... [2021-11-21 01:52:33,611 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:52:33,699 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:52:33,897 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_06bf67f7-7637-4d12-9c73-bf73026902ad/sv-benchmarks/c/seq-mthreaded/rekh_aso.1.M1-1.c[1800,1813] [2021-11-21 01:52:34,413 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:52:34,438 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:52:34,458 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_06bf67f7-7637-4d12-9c73-bf73026902ad/sv-benchmarks/c/seq-mthreaded/rekh_aso.1.M1-1.c[1800,1813] [2021-11-21 01:52:34,747 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:52:34,770 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:52:34,771 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:34 WrapperNode [2021-11-21 01:52:34,771 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:52:34,772 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:52:34,772 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:52:34,773 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:52:34,780 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:34" (1/1) ... [2021-11-21 01:52:34,876 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:34" (1/1) ... [2021-11-21 01:52:35,118 INFO L137 Inliner]: procedures = 60, calls = 3129, calls flagged for inlining = 19, calls inlined = 19, statements flattened = 5933 [2021-11-21 01:52:35,119 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:52:35,120 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:52:35,120 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:52:35,120 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:52:35,128 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:34" (1/1) ... [2021-11-21 01:52:35,129 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:34" (1/1) ... [2021-11-21 01:52:35,187 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:34" (1/1) ... [2021-11-21 01:52:35,187 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:34" (1/1) ... [2021-11-21 01:52:35,389 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:34" (1/1) ... [2021-11-21 01:52:35,423 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:34" (1/1) ... [2021-11-21 01:52:35,448 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:34" (1/1) ... [2021-11-21 01:52:35,486 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:52:35,487 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:52:35,488 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:52:35,488 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:52:35,489 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:34" (1/1) ... [2021-11-21 01:52:35,496 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:52:35,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:52:35,518 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:52:35,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:52:35,569 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:52:35,569 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_cmd_forward [2021-11-21 01:52:35,569 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_cmd_forward [2021-11-21 01:52:35,569 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t2 [2021-11-21 01:52:35,570 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t2 [2021-11-21 01:52:35,570 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_nxtway_gs_mode [2021-11-21 01:52:35,570 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_nxtway_gs_mode [2021-11-21 01:52:35,570 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:52:35,570 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t0 [2021-11-21 01:52:35,570 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t0 [2021-11-21 01:52:35,570 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_cs_t1 [2021-11-21 01:52:35,571 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_cs_t1 [2021-11-21 01:52:35,571 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_obstacle_flag [2021-11-21 01:52:35,571 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_obstacle_flag [2021-11-21 01:52:35,571 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:52:35,571 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_set_count [2021-11-21 01:52:35,571 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_set_count [2021-11-21 01:52:35,572 INFO L130 BoogieDeclarations]: Found specification of procedure ecrobot_get_gyro_sensor [2021-11-21 01:52:35,572 INFO L138 BoogieDeclarations]: Found implementation of procedure ecrobot_get_gyro_sensor [2021-11-21 01:52:35,572 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_cmd_turn [2021-11-21 01:52:35,572 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_cmd_turn [2021-11-21 01:52:35,572 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_OSEK_Task_ts1 [2021-11-21 01:52:35,572 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_OSEK_Task_ts1 [2021-11-21 01:52:35,573 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_OSEK_Task_ts2 [2021-11-21 01:52:35,573 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_OSEK_Task_ts2 [2021-11-21 01:52:35,573 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_entry_pt_OSEK_Task_ts3 [2021-11-21 01:52:35,573 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_entry_pt_OSEK_Task_ts3 [2021-11-21 01:52:35,574 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:52:35,574 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:52:35,574 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2021-11-21 01:52:35,574 INFO L138 BoogieDeclarations]: Found implementation of procedure assert [2021-11-21 01:52:35,574 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_set_speed [2021-11-21 01:52:35,574 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_set_speed [2021-11-21 01:52:35,574 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_write_cmd_forward [2021-11-21 01:52:35,575 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_write_cmd_forward [2021-11-21 01:52:35,575 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_obstacle_flag [2021-11-21 01:52:35,575 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_obstacle_flag [2021-11-21 01:52:35,575 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-21 01:52:35,576 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-21 01:52:35,576 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:52:35,576 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:52:35,576 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:52:35,576 INFO L130 BoogieDeclarations]: Found specification of procedure ecrobot_get_systick_ms [2021-11-21 01:52:35,576 INFO L138 BoogieDeclarations]: Found implementation of procedure ecrobot_get_systick_ms [2021-11-21 01:52:35,577 INFO L130 BoogieDeclarations]: Found specification of procedure nxt_motor_get_count [2021-11-21 01:52:35,577 INFO L138 BoogieDeclarations]: Found implementation of procedure nxt_motor_get_count [2021-11-21 01:52:35,578 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_nxtway_gs_mode [2021-11-21 01:52:35,578 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_nxtway_gs_mode [2021-11-21 01:52:35,579 INFO L130 BoogieDeclarations]: Found specification of procedure __startrek_read_cmd_turn [2021-11-21 01:52:35,579 INFO L138 BoogieDeclarations]: Found implementation of procedure __startrek_read_cmd_turn [2021-11-21 01:52:36,383 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:52:36,386 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:52:47,409 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:52:47,820 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:52:47,820 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-21 01:52:47,826 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:52:47 BoogieIcfgContainer [2021-11-21 01:52:47,826 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:52:47,828 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:52:47,828 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:52:47,831 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:52:47,831 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:52:33" (1/3) ... [2021-11-21 01:52:47,832 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c168c05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:52:47, skipping insertion in model container [2021-11-21 01:52:47,832 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:34" (2/3) ... [2021-11-21 01:52:47,833 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c168c05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:52:47, skipping insertion in model container [2021-11-21 01:52:47,833 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:52:47" (3/3) ... [2021-11-21 01:52:47,834 INFO L111 eAbstractionObserver]: Analyzing ICFG rekh_aso.1.M1-1.c [2021-11-21 01:52:47,839 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:52:47,840 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:52:47,897 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:52:47,904 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 [2021-11-21 01:52:47,904 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:52:47,998 INFO L276 IsEmpty]: Start isEmpty. Operand has 2291 states, 1330 states have (on average 1.199248120300752) internal successors, (1595), 1334 states have internal predecessors, (1595), 938 states have call successors, (938), 21 states have call predecessors, (938), 21 states have return successors, (938), 936 states have call predecessors, (938), 938 states have call successors, (938) [2021-11-21 01:52:48,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 911 [2021-11-21 01:52:48,064 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:52:48,066 INFO L514 BasicCegarLoop]: trace histogram [209, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:52:48,066 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:52:48,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:52:48,072 INFO L85 PathProgramCache]: Analyzing trace with hash -318139095, now seen corresponding path program 1 times [2021-11-21 01:52:48,082 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:52:48,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1780469201] [2021-11-21 01:52:48,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:48,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:52:48,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:52:49,677 INFO L134 CoverageAnalysis]: Checked inductivity of 43472 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43472 trivial. 0 not checked. [2021-11-21 01:52:49,678 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:52:49,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1780469201] [2021-11-21 01:52:49,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1780469201] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:52:49,679 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:52:49,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:52:49,681 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413168722] [2021-11-21 01:52:49,682 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:52:49,690 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:52:49,705 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:52:49,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:52:49,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:52:49,767 INFO L87 Difference]: Start difference. First operand has 2291 states, 1330 states have (on average 1.199248120300752) internal successors, (1595), 1334 states have internal predecessors, (1595), 938 states have call successors, (938), 21 states have call predecessors, (938), 21 states have return successors, (938), 936 states have call predecessors, (938), 938 states have call successors, (938) Second operand has 3 states, 3 states have (on average 93.0) internal successors, (279), 3 states have internal predecessors, (279), 2 states have call successors, (212), 2 states have call predecessors, (212), 2 states have return successors, (211), 2 states have call predecessors, (211), 2 states have call successors, (211) [2021-11-21 01:52:51,803 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:52:54,016 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:52:54,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:52:54,601 INFO L93 Difference]: Finished difference Result 4014 states and 6132 transitions. [2021-11-21 01:52:54,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:52:54,607 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 93.0) internal successors, (279), 3 states have internal predecessors, (279), 2 states have call successors, (212), 2 states have call predecessors, (212), 2 states have return successors, (211), 2 states have call predecessors, (211), 2 states have call successors, (211) Word has length 910 [2021-11-21 01:52:54,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:52:54,674 INFO L225 Difference]: With dead ends: 4014 [2021-11-21 01:52:54,674 INFO L226 Difference]: Without dead ends: 2289 [2021-11-21 01:52:54,699 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 [2021-11-21 01:52:54,706 INFO L933 BasicCegarLoop]: 3436 mSDtfsCounter, 24 mSDsluCounter, 3413 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 3 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 6826 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:52:54,708 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 6826 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 59 Invalid, 2 Unknown, 0 Unchecked, 4.4s Time] [2021-11-21 01:52:54,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2289 states. [2021-11-21 01:52:55,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2289 to 2289. [2021-11-21 01:52:55,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2289 states, 1329 states have (on average 1.1978931527464258) internal successors, (1592), 1333 states have internal predecessors, (1592), 938 states have call successors, (938), 21 states have call predecessors, (938), 21 states have return successors, (937), 935 states have call predecessors, (937), 937 states have call successors, (937) [2021-11-21 01:52:55,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2289 states to 2289 states and 3467 transitions. [2021-11-21 01:52:55,467 INFO L78 Accepts]: Start accepts. Automaton has 2289 states and 3467 transitions. Word has length 910 [2021-11-21 01:52:55,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:52:55,473 INFO L470 AbstractCegarLoop]: Abstraction has 2289 states and 3467 transitions. [2021-11-21 01:52:55,474 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 93.0) internal successors, (279), 3 states have internal predecessors, (279), 2 states have call successors, (212), 2 states have call predecessors, (212), 2 states have return successors, (211), 2 states have call predecessors, (211), 2 states have call successors, (211) [2021-11-21 01:52:55,474 INFO L276 IsEmpty]: Start isEmpty. Operand 2289 states and 3467 transitions. [2021-11-21 01:52:55,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 917 [2021-11-21 01:52:55,531 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:52:55,532 INFO L514 BasicCegarLoop]: trace histogram [209, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:52:55,532 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:52:55,533 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:52:55,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:52:55,537 INFO L85 PathProgramCache]: Analyzing trace with hash -866018391, now seen corresponding path program 1 times [2021-11-21 01:52:55,537 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:52:55,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825692759] [2021-11-21 01:52:55,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:55,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:52:55,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:52:57,056 INFO L134 CoverageAnalysis]: Checked inductivity of 43474 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43474 trivial. 0 not checked. [2021-11-21 01:52:57,056 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:52:57,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825692759] [2021-11-21 01:52:57,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1825692759] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:52:57,057 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:52:57,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:52:57,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516797728] [2021-11-21 01:52:57,058 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:52:57,062 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:52:57,062 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:52:57,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:52:57,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:52:57,064 INFO L87 Difference]: Start difference. First operand 2289 states and 3467 transitions. Second operand has 5 states, 4 states have (on average 70.0) internal successors, (280), 5 states have internal predecessors, (280), 4 states have call successors, (214), 2 states have call predecessors, (214), 2 states have return successors, (213), 3 states have call predecessors, (213), 4 states have call successors, (213) [2021-11-21 01:52:59,082 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:53:01,199 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:53:08,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:53:08,701 INFO L93 Difference]: Finished difference Result 4290 states and 6505 transitions. [2021-11-21 01:53:08,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:53:08,703 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 70.0) internal successors, (280), 5 states have internal predecessors, (280), 4 states have call successors, (214), 2 states have call predecessors, (214), 2 states have return successors, (213), 3 states have call predecessors, (213), 4 states have call successors, (213) Word has length 916 [2021-11-21 01:53:08,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:53:08,727 INFO L225 Difference]: With dead ends: 4290 [2021-11-21 01:53:08,727 INFO L226 Difference]: Without dead ends: 2569 [2021-11-21 01:53:08,738 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:53:08,739 INFO L933 BasicCegarLoop]: 3795 mSDtfsCounter, 3645 mSDsluCounter, 3157 mSDsCounter, 0 mSdLazyCounter, 1683 mSolverCounterSat, 650 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3645 SdHoareTripleChecker+Valid, 6917 SdHoareTripleChecker+Invalid, 2335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 650 IncrementalHoareTripleChecker+Valid, 1683 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:53:08,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3645 Valid, 6917 Invalid, 2335 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [650 Valid, 1683 Invalid, 2 Unknown, 0 Unchecked, 11.2s Time] [2021-11-21 01:53:08,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2569 states. [2021-11-21 01:53:09,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2569 to 2567. [2021-11-21 01:53:09,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2567 states, 1531 states have (on average 1.2181580666231222) internal successors, (1865), 1535 states have internal predecessors, (1865), 1004 states have call successors, (1004), 31 states have call predecessors, (1004), 31 states have return successors, (1003), 1001 states have call predecessors, (1003), 1003 states have call successors, (1003) [2021-11-21 01:53:09,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2567 states to 2567 states and 3872 transitions. [2021-11-21 01:53:09,163 INFO L78 Accepts]: Start accepts. Automaton has 2567 states and 3872 transitions. Word has length 916 [2021-11-21 01:53:09,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:53:09,165 INFO L470 AbstractCegarLoop]: Abstraction has 2567 states and 3872 transitions. [2021-11-21 01:53:09,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 70.0) internal successors, (280), 5 states have internal predecessors, (280), 4 states have call successors, (214), 2 states have call predecessors, (214), 2 states have return successors, (213), 3 states have call predecessors, (213), 4 states have call successors, (213) [2021-11-21 01:53:09,167 INFO L276 IsEmpty]: Start isEmpty. Operand 2567 states and 3872 transitions. [2021-11-21 01:53:09,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 921 [2021-11-21 01:53:09,179 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:53:09,180 INFO L514 BasicCegarLoop]: trace histogram [209, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:53:09,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 01:53:09,180 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:53:09,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:53:09,181 INFO L85 PathProgramCache]: Analyzing trace with hash -168189512, now seen corresponding path program 1 times [2021-11-21 01:53:09,182 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:53:09,182 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664491582] [2021-11-21 01:53:09,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:09,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:53:09,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:53:10,130 INFO L134 CoverageAnalysis]: Checked inductivity of 43474 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 43474 trivial. 0 not checked. [2021-11-21 01:53:10,131 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:53:10,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664491582] [2021-11-21 01:53:10,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1664491582] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:53:10,131 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:53:10,132 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 01:53:10,132 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925039991] [2021-11-21 01:53:10,132 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:53:10,134 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:53:10,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:53:10,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:53:10,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:53:10,136 INFO L87 Difference]: Start difference. First operand 2567 states and 3872 transitions. Second operand has 6 states, 6 states have (on average 47.0) internal successors, (282), 5 states have internal predecessors, (282), 3 states have call successors, (215), 3 states have call predecessors, (215), 2 states have return successors, (214), 3 states have call predecessors, (214), 3 states have call successors, (214) [2021-11-21 01:53:12,150 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:53:16,369 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:53:35,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:53:35,058 INFO L93 Difference]: Finished difference Result 4476 states and 6762 transitions. [2021-11-21 01:53:35,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 01:53:35,061 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 47.0) internal successors, (282), 5 states have internal predecessors, (282), 3 states have call successors, (215), 3 states have call predecessors, (215), 2 states have return successors, (214), 3 states have call predecessors, (214), 3 states have call successors, (214) Word has length 920 [2021-11-21 01:53:35,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:53:35,111 INFO L225 Difference]: With dead ends: 4476 [2021-11-21 01:53:35,112 INFO L226 Difference]: Without dead ends: 4451 [2021-11-21 01:53:35,116 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:53:35,120 INFO L933 BasicCegarLoop]: 3319 mSDtfsCounter, 2500 mSDsluCounter, 9192 mSDsCounter, 0 mSdLazyCounter, 5837 mSolverCounterSat, 2001 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3137 SdHoareTripleChecker+Valid, 12491 SdHoareTripleChecker+Invalid, 7840 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 2001 IncrementalHoareTripleChecker+Valid, 5837 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:53:35,121 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3137 Valid, 12491 Invalid, 7840 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [2001 Valid, 5837 Invalid, 2 Unknown, 0 Unchecked, 24.3s Time] [2021-11-21 01:53:35,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4451 states. [2021-11-21 01:53:35,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4451 to 3585. [2021-11-21 01:53:35,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3585 states, 2146 states have (on average 1.2185461323392357) internal successors, (2615), 2151 states have internal predecessors, (2615), 1395 states have call successors, (1395), 42 states have call predecessors, (1395), 43 states have return successors, (1417), 1392 states have call predecessors, (1417), 1394 states have call successors, (1417) [2021-11-21 01:53:35,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3585 states to 3585 states and 5427 transitions. [2021-11-21 01:53:35,749 INFO L78 Accepts]: Start accepts. Automaton has 3585 states and 5427 transitions. Word has length 920 [2021-11-21 01:53:35,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:53:35,751 INFO L470 AbstractCegarLoop]: Abstraction has 3585 states and 5427 transitions. [2021-11-21 01:53:35,752 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 47.0) internal successors, (282), 5 states have internal predecessors, (282), 3 states have call successors, (215), 3 states have call predecessors, (215), 2 states have return successors, (214), 3 states have call predecessors, (214), 3 states have call successors, (214) [2021-11-21 01:53:35,752 INFO L276 IsEmpty]: Start isEmpty. Operand 3585 states and 5427 transitions. [2021-11-21 01:53:35,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 970 [2021-11-21 01:53:35,771 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:53:35,772 INFO L514 BasicCegarLoop]: trace histogram [214, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:53:35,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 01:53:35,772 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:53:35,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:53:35,773 INFO L85 PathProgramCache]: Analyzing trace with hash -1654368772, now seen corresponding path program 1 times [2021-11-21 01:53:35,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:53:35,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1762270887] [2021-11-21 01:53:35,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:35,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:53:36,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:53:36,576 INFO L134 CoverageAnalysis]: Checked inductivity of 45592 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 45590 trivial. 0 not checked. [2021-11-21 01:53:36,576 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:53:36,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1762270887] [2021-11-21 01:53:36,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1762270887] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:53:36,577 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:53:36,577 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:53:36,577 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183750099] [2021-11-21 01:53:36,579 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:53:36,581 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:53:36,581 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:53:36,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:53:36,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:53:36,594 INFO L87 Difference]: Start difference. First operand 3585 states and 5427 transitions. Second operand has 5 states, 4 states have (on average 76.0) internal successors, (304), 5 states have internal predecessors, (304), 4 states have call successors, (224), 2 states have call predecessors, (224), 2 states have return successors, (223), 3 states have call predecessors, (223), 4 states have call successors, (223) [2021-11-21 01:53:38,616 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:53:40,684 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:53:49,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:53:49,941 INFO L93 Difference]: Finished difference Result 7420 states and 11177 transitions. [2021-11-21 01:53:49,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:53:49,944 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 76.0) internal successors, (304), 5 states have internal predecessors, (304), 4 states have call successors, (224), 2 states have call predecessors, (224), 2 states have return successors, (223), 3 states have call predecessors, (223), 4 states have call successors, (223) Word has length 969 [2021-11-21 01:53:49,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:53:49,984 INFO L225 Difference]: With dead ends: 7420 [2021-11-21 01:53:49,985 INFO L226 Difference]: Without dead ends: 4471 [2021-11-21 01:53:50,000 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:53:50,001 INFO L933 BasicCegarLoop]: 4262 mSDtfsCounter, 2915 mSDsluCounter, 6025 mSDsCounter, 0 mSdLazyCounter, 2138 mSolverCounterSat, 31 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2915 SdHoareTripleChecker+Valid, 10193 SdHoareTripleChecker+Invalid, 2171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 2138 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:53:50,002 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2915 Valid, 10193 Invalid, 2171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 2138 Invalid, 2 Unknown, 0 Unchecked, 13.0s Time] [2021-11-21 01:53:50,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4471 states. [2021-11-21 01:53:50,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4471 to 4467. [2021-11-21 01:53:50,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4467 states, 2773 states have (on average 1.2452217814641182) internal successors, (3453), 2782 states have internal predecessors, (3453), 1616 states have call successors, (1616), 75 states have call predecessors, (1616), 77 states have return successors, (1638), 1611 states have call predecessors, (1638), 1615 states have call successors, (1638) [2021-11-21 01:53:50,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4467 states to 4467 states and 6707 transitions. [2021-11-21 01:53:50,698 INFO L78 Accepts]: Start accepts. Automaton has 4467 states and 6707 transitions. Word has length 969 [2021-11-21 01:53:50,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:53:50,700 INFO L470 AbstractCegarLoop]: Abstraction has 4467 states and 6707 transitions. [2021-11-21 01:53:50,701 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 76.0) internal successors, (304), 5 states have internal predecessors, (304), 4 states have call successors, (224), 2 states have call predecessors, (224), 2 states have return successors, (223), 3 states have call predecessors, (223), 4 states have call successors, (223) [2021-11-21 01:53:50,701 INFO L276 IsEmpty]: Start isEmpty. Operand 4467 states and 6707 transitions. [2021-11-21 01:53:50,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 974 [2021-11-21 01:53:50,721 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:53:50,721 INFO L514 BasicCegarLoop]: trace histogram [214, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:53:50,722 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 01:53:50,722 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:53:50,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:53:50,723 INFO L85 PathProgramCache]: Analyzing trace with hash 734709241, now seen corresponding path program 1 times [2021-11-21 01:53:50,723 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:53:50,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988671841] [2021-11-21 01:53:50,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:53:50,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:53:50,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:53:51,511 INFO L134 CoverageAnalysis]: Checked inductivity of 45592 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 45585 trivial. 0 not checked. [2021-11-21 01:53:51,512 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:53:51,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988671841] [2021-11-21 01:53:51,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988671841] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:53:51,512 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:53:51,513 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 01:53:51,513 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80503931] [2021-11-21 01:53:51,513 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:53:51,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:53:51,515 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:53:51,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:53:51,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:53:51,516 INFO L87 Difference]: Start difference. First operand 4467 states and 6707 transitions. Second operand has 6 states, 6 states have (on average 51.666666666666664) internal successors, (310), 6 states have internal predecessors, (310), 3 states have call successors, (225), 2 states have call predecessors, (225), 4 states have return successors, (224), 3 states have call predecessors, (224), 3 states have call successors, (224) [2021-11-21 01:53:53,531 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:53:55,609 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:54:08,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:54:08,549 INFO L93 Difference]: Finished difference Result 8345 states and 12528 transitions. [2021-11-21 01:54:08,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 01:54:08,552 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 51.666666666666664) internal successors, (310), 6 states have internal predecessors, (310), 3 states have call successors, (225), 2 states have call predecessors, (225), 4 states have return successors, (224), 3 states have call predecessors, (224), 3 states have call successors, (224) Word has length 973 [2021-11-21 01:54:08,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:54:08,597 INFO L225 Difference]: With dead ends: 8345 [2021-11-21 01:54:08,597 INFO L226 Difference]: Without dead ends: 5139 [2021-11-21 01:54:08,615 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-21 01:54:08,616 INFO L933 BasicCegarLoop]: 4106 mSDtfsCounter, 2995 mSDsluCounter, 7968 mSDsCounter, 0 mSdLazyCounter, 3399 mSolverCounterSat, 32 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2996 SdHoareTripleChecker+Valid, 11963 SdHoareTripleChecker+Invalid, 3433 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 3399 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:54:08,617 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2996 Valid, 11963 Invalid, 3433 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 3399 Invalid, 2 Unknown, 0 Unchecked, 16.6s Time] [2021-11-21 01:54:08,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5139 states. [2021-11-21 01:54:09,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5139 to 4816. [2021-11-21 01:54:09,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4816 states, 3010 states have (on average 1.2511627906976743) internal successors, (3766), 3026 states have internal predecessors, (3766), 1713 states have call successors, (1713), 88 states have call predecessors, (1713), 92 states have return successors, (1737), 1704 states have call predecessors, (1737), 1712 states have call successors, (1737) [2021-11-21 01:54:09,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4816 states to 4816 states and 7216 transitions. [2021-11-21 01:54:09,275 INFO L78 Accepts]: Start accepts. Automaton has 4816 states and 7216 transitions. Word has length 973 [2021-11-21 01:54:09,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:54:09,277 INFO L470 AbstractCegarLoop]: Abstraction has 4816 states and 7216 transitions. [2021-11-21 01:54:09,278 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 51.666666666666664) internal successors, (310), 6 states have internal predecessors, (310), 3 states have call successors, (225), 2 states have call predecessors, (225), 4 states have return successors, (224), 3 states have call predecessors, (224), 3 states have call successors, (224) [2021-11-21 01:54:09,278 INFO L276 IsEmpty]: Start isEmpty. Operand 4816 states and 7216 transitions. [2021-11-21 01:54:09,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 975 [2021-11-21 01:54:09,300 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:54:09,301 INFO L514 BasicCegarLoop]: trace histogram [214, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:54:09,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-21 01:54:09,302 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:54:09,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:54:09,303 INFO L85 PathProgramCache]: Analyzing trace with hash -93105688, now seen corresponding path program 1 times [2021-11-21 01:54:09,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:54:09,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41631808] [2021-11-21 01:54:09,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:54:09,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:54:09,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:54:10,103 INFO L134 CoverageAnalysis]: Checked inductivity of 45592 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 45586 trivial. 0 not checked. [2021-11-21 01:54:10,104 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:54:10,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41631808] [2021-11-21 01:54:10,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [41631808] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:54:10,104 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:54:10,104 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 01:54:10,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006603908] [2021-11-21 01:54:10,105 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:54:10,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:54:10,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:54:10,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:54:10,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:54:10,108 INFO L87 Difference]: Start difference. First operand 4816 states and 7216 transitions. Second operand has 6 states, 6 states have (on average 51.666666666666664) internal successors, (310), 6 states have internal predecessors, (310), 3 states have call successors, (225), 2 states have call predecessors, (225), 4 states have return successors, (224), 3 states have call predecessors, (224), 3 states have call successors, (224) [2021-11-21 01:54:12,122 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:54:14,194 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:54:25,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:54:25,695 INFO L93 Difference]: Finished difference Result 8693 states and 13028 transitions. [2021-11-21 01:54:25,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:54:25,697 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 51.666666666666664) internal successors, (310), 6 states have internal predecessors, (310), 3 states have call successors, (225), 2 states have call predecessors, (225), 4 states have return successors, (224), 3 states have call predecessors, (224), 3 states have call successors, (224) Word has length 974 [2021-11-21 01:54:25,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:54:25,741 INFO L225 Difference]: With dead ends: 8693 [2021-11-21 01:54:25,741 INFO L226 Difference]: Without dead ends: 5495 [2021-11-21 01:54:25,758 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:54:25,759 INFO L933 BasicCegarLoop]: 4199 mSDtfsCounter, 3388 mSDsluCounter, 5898 mSDsCounter, 0 mSdLazyCounter, 2122 mSolverCounterSat, 399 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3390 SdHoareTripleChecker+Valid, 10021 SdHoareTripleChecker+Invalid, 2523 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 399 IncrementalHoareTripleChecker+Valid, 2122 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:54:25,759 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3390 Valid, 10021 Invalid, 2523 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [399 Valid, 2122 Invalid, 2 Unknown, 0 Unchecked, 15.2s Time] [2021-11-21 01:54:25,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5495 states. [2021-11-21 01:54:26,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5495 to 5170. [2021-11-21 01:54:26,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5170 states, 3250 states have (on average 1.2566153846153847) internal successors, (4084), 3273 states have internal predecessors, (4084), 1812 states have call successors, (1812), 101 states have call predecessors, (1812), 107 states have return successors, (1838), 1799 states have call predecessors, (1838), 1811 states have call successors, (1838) [2021-11-21 01:54:26,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5170 states to 5170 states and 7734 transitions. [2021-11-21 01:54:26,491 INFO L78 Accepts]: Start accepts. Automaton has 5170 states and 7734 transitions. Word has length 974 [2021-11-21 01:54:26,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:54:26,493 INFO L470 AbstractCegarLoop]: Abstraction has 5170 states and 7734 transitions. [2021-11-21 01:54:26,493 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 51.666666666666664) internal successors, (310), 6 states have internal predecessors, (310), 3 states have call successors, (225), 2 states have call predecessors, (225), 4 states have return successors, (224), 3 states have call predecessors, (224), 3 states have call successors, (224) [2021-11-21 01:54:26,493 INFO L276 IsEmpty]: Start isEmpty. Operand 5170 states and 7734 transitions. [2021-11-21 01:54:26,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 974 [2021-11-21 01:54:26,518 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:54:26,518 INFO L514 BasicCegarLoop]: trace histogram [210, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:54:26,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-21 01:54:26,519 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:54:26,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:54:26,520 INFO L85 PathProgramCache]: Analyzing trace with hash 1183207785, now seen corresponding path program 1 times [2021-11-21 01:54:26,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:54:26,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [890602785] [2021-11-21 01:54:26,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:54:26,521 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:54:26,791 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:54:26,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1621432246] [2021-11-21 01:54:26,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:54:26,792 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:26,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:54:26,800 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:54:26,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:54:27,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:54:27,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 3247 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:54:27,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:54:30,004 INFO L134 CoverageAnalysis]: Checked inductivity of 43900 backedges. 832 proven. 0 refuted. 0 times theorem prover too weak. 43068 trivial. 0 not checked. [2021-11-21 01:54:30,004 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:54:30,004 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:54:30,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [890602785] [2021-11-21 01:54:30,005 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:54:30,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1621432246] [2021-11-21 01:54:30,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1621432246] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:54:30,005 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:54:30,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:54:30,006 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136461822] [2021-11-21 01:54:30,006 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:54:30,008 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:54:30,009 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:54:30,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:54:30,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:54:30,010 INFO L87 Difference]: Start difference. First operand 5170 states and 7734 transitions. Second operand has 5 states, 5 states have (on average 62.6) internal successors, (313), 5 states have internal predecessors, (313), 3 states have call successors, (223), 3 states have call predecessors, (223), 3 states have return successors, (222), 3 states have call predecessors, (222), 3 states have call successors, (222) [2021-11-21 01:54:32,035 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:54:34,138 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:54:43,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:54:43,319 INFO L93 Difference]: Finished difference Result 9318 states and 13979 transitions. [2021-11-21 01:54:43,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:54:43,322 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 62.6) internal successors, (313), 5 states have internal predecessors, (313), 3 states have call successors, (223), 3 states have call predecessors, (223), 3 states have return successors, (222), 3 states have call predecessors, (222), 3 states have call successors, (222) Word has length 973 [2021-11-21 01:54:43,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:54:43,362 INFO L225 Difference]: With dead ends: 9318 [2021-11-21 01:54:43,362 INFO L226 Difference]: Without dead ends: 5493 [2021-11-21 01:54:43,386 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 973 GetRequests, 969 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:54:43,387 INFO L933 BasicCegarLoop]: 3881 mSDtfsCounter, 1702 mSDsluCounter, 6011 mSDsCounter, 0 mSdLazyCounter, 2058 mSolverCounterSat, 35 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1705 SdHoareTripleChecker+Valid, 9812 SdHoareTripleChecker+Invalid, 2095 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 2058 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.9s IncrementalHoareTripleChecker+Time [2021-11-21 01:54:43,387 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1705 Valid, 9812 Invalid, 2095 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 2058 Invalid, 2 Unknown, 0 Unchecked, 12.9s Time] [2021-11-21 01:54:43,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5493 states. [2021-11-21 01:54:44,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5493 to 5170. [2021-11-21 01:54:44,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5170 states, 3250 states have (on average 1.256) internal successors, (4082), 3273 states have internal predecessors, (4082), 1812 states have call successors, (1812), 101 states have call predecessors, (1812), 107 states have return successors, (1838), 1799 states have call predecessors, (1838), 1811 states have call successors, (1838) [2021-11-21 01:54:44,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5170 states to 5170 states and 7732 transitions. [2021-11-21 01:54:44,127 INFO L78 Accepts]: Start accepts. Automaton has 5170 states and 7732 transitions. Word has length 973 [2021-11-21 01:54:44,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:54:44,129 INFO L470 AbstractCegarLoop]: Abstraction has 5170 states and 7732 transitions. [2021-11-21 01:54:44,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 62.6) internal successors, (313), 5 states have internal predecessors, (313), 3 states have call successors, (223), 3 states have call predecessors, (223), 3 states have return successors, (222), 3 states have call predecessors, (222), 3 states have call successors, (222) [2021-11-21 01:54:44,130 INFO L276 IsEmpty]: Start isEmpty. Operand 5170 states and 7732 transitions. [2021-11-21 01:54:44,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 974 [2021-11-21 01:54:44,158 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:54:44,159 INFO L514 BasicCegarLoop]: trace histogram [210, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:54:44,197 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:54:44,381 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:44,381 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:54:44,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:54:44,382 INFO L85 PathProgramCache]: Analyzing trace with hash 1228396570, now seen corresponding path program 1 times [2021-11-21 01:54:44,382 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:54:44,382 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1447773629] [2021-11-21 01:54:44,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:54:44,383 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:54:44,599 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:54:44,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [164202315] [2021-11-21 01:54:44,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:54:44,600 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:44,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:54:44,603 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:54:44,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:54:45,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:54:45,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 3248 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:54:45,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:54:48,117 INFO L134 CoverageAnalysis]: Checked inductivity of 43900 backedges. 832 proven. 0 refuted. 0 times theorem prover too weak. 43068 trivial. 0 not checked. [2021-11-21 01:54:48,118 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:54:48,119 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:54:48,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1447773629] [2021-11-21 01:54:48,119 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:54:48,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [164202315] [2021-11-21 01:54:48,119 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [164202315] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:54:48,120 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:54:48,120 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:54:48,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438081622] [2021-11-21 01:54:48,121 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:54:48,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:54:48,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:54:48,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:54:48,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:54:48,125 INFO L87 Difference]: Start difference. First operand 5170 states and 7732 transitions. Second operand has 5 states, 5 states have (on average 62.6) internal successors, (313), 5 states have internal predecessors, (313), 3 states have call successors, (223), 3 states have call predecessors, (223), 3 states have return successors, (222), 3 states have call predecessors, (222), 3 states have call successors, (222) [2021-11-21 01:54:50,143 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:54:52,370 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:55:09,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:55:09,805 INFO L93 Difference]: Finished difference Result 11903 states and 17897 transitions. [2021-11-21 01:55:09,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:55:09,809 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 62.6) internal successors, (313), 5 states have internal predecessors, (313), 3 states have call successors, (223), 3 states have call predecessors, (223), 3 states have return successors, (222), 3 states have call predecessors, (222), 3 states have call successors, (222) Word has length 973 [2021-11-21 01:55:09,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:55:09,850 INFO L225 Difference]: With dead ends: 11903 [2021-11-21 01:55:09,850 INFO L226 Difference]: Without dead ends: 8072 [2021-11-21 01:55:09,875 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 973 GetRequests, 969 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:55:09,876 INFO L933 BasicCegarLoop]: 4582 mSDtfsCounter, 2507 mSDsluCounter, 7400 mSDsCounter, 0 mSdLazyCounter, 2994 mSolverCounterSat, 4 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2508 SdHoareTripleChecker+Valid, 11887 SdHoareTripleChecker+Invalid, 3000 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 2994 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:55:09,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2508 Valid, 11887 Invalid, 3000 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 2994 Invalid, 2 Unknown, 0 Unchecked, 21.1s Time] [2021-11-21 01:55:09,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8072 states. [2021-11-21 01:55:11,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8072 to 6564. [2021-11-21 01:55:11,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6564 states, 4079 states have (on average 1.2598676146114243) internal successors, (5139), 4177 states have internal predecessors, (5139), 2353 states have call successors, (2353), 121 states have call predecessors, (2353), 131 states have return successors, (2405), 2270 states have call predecessors, (2405), 2352 states have call successors, (2405) [2021-11-21 01:55:11,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6564 states to 6564 states and 9897 transitions. [2021-11-21 01:55:11,402 INFO L78 Accepts]: Start accepts. Automaton has 6564 states and 9897 transitions. Word has length 973 [2021-11-21 01:55:11,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:55:11,403 INFO L470 AbstractCegarLoop]: Abstraction has 6564 states and 9897 transitions. [2021-11-21 01:55:11,404 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 62.6) internal successors, (313), 5 states have internal predecessors, (313), 3 states have call successors, (223), 3 states have call predecessors, (223), 3 states have return successors, (222), 3 states have call predecessors, (222), 3 states have call successors, (222) [2021-11-21 01:55:11,404 INFO L276 IsEmpty]: Start isEmpty. Operand 6564 states and 9897 transitions. [2021-11-21 01:55:11,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 975 [2021-11-21 01:55:11,436 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:11,437 INFO L514 BasicCegarLoop]: trace histogram [210, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:55:11,489 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:55:11,653 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:11,653 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:55:11,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:11,654 INFO L85 PathProgramCache]: Analyzing trace with hash -1805363466, now seen corresponding path program 1 times [2021-11-21 01:55:11,655 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:11,655 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156092342] [2021-11-21 01:55:11,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:11,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:11,993 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:55:11,993 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [97295556] [2021-11-21 01:55:11,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:11,994 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:11,994 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:55:11,995 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:55:11,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:55:13,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:13,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 3250 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:55:13,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:55:15,483 INFO L134 CoverageAnalysis]: Checked inductivity of 43900 backedges. 832 proven. 0 refuted. 0 times theorem prover too weak. 43068 trivial. 0 not checked. [2021-11-21 01:55:15,484 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:55:15,484 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:15,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156092342] [2021-11-21 01:55:15,485 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:55:15,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [97295556] [2021-11-21 01:55:15,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [97295556] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:55:15,485 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:55:15,486 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:55:15,486 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418906196] [2021-11-21 01:55:15,487 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:55:15,489 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:55:15,489 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:15,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:55:15,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:55:15,490 INFO L87 Difference]: Start difference. First operand 6564 states and 9897 transitions. Second operand has 5 states, 5 states have (on average 62.8) internal successors, (314), 5 states have internal predecessors, (314), 3 states have call successors, (223), 3 states have call predecessors, (223), 3 states have return successors, (222), 3 states have call predecessors, (222), 3 states have call successors, (222) [2021-11-21 01:55:17,509 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:55:19,601 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:55:37,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:55:37,303 INFO L93 Difference]: Finished difference Result 14181 states and 21462 transitions. [2021-11-21 01:55:37,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:55:37,307 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 62.8) internal successors, (314), 5 states have internal predecessors, (314), 3 states have call successors, (223), 3 states have call predecessors, (223), 3 states have return successors, (222), 3 states have call predecessors, (222), 3 states have call successors, (222) Word has length 974 [2021-11-21 01:55:37,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:55:37,366 INFO L225 Difference]: With dead ends: 14181 [2021-11-21 01:55:37,366 INFO L226 Difference]: Without dead ends: 8953 [2021-11-21 01:55:37,392 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 974 GetRequests, 970 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:55:37,393 INFO L933 BasicCegarLoop]: 4608 mSDtfsCounter, 2115 mSDsluCounter, 9937 mSDsCounter, 0 mSdLazyCounter, 2645 mSolverCounterSat, 9 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 17.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2117 SdHoareTripleChecker+Valid, 14432 SdHoareTripleChecker+Invalid, 2656 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 2645 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:55:37,394 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2117 Valid, 14432 Invalid, 2656 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 2645 Invalid, 2 Unknown, 0 Unchecked, 21.2s Time] [2021-11-21 01:55:37,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8953 states. [2021-11-21 01:55:39,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8953 to 7482. [2021-11-21 01:55:39,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7482 states, 4611 states have (on average 1.2600303621774018) internal successors, (5810), 4758 states have internal predecessors, (5810), 2724 states have call successors, (2724), 134 states have call predecessors, (2724), 146 states have return successors, (2799), 2595 states have call predecessors, (2799), 2723 states have call successors, (2799) [2021-11-21 01:55:39,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7482 states to 7482 states and 11333 transitions. [2021-11-21 01:55:39,385 INFO L78 Accepts]: Start accepts. Automaton has 7482 states and 11333 transitions. Word has length 974 [2021-11-21 01:55:39,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:55:39,387 INFO L470 AbstractCegarLoop]: Abstraction has 7482 states and 11333 transitions. [2021-11-21 01:55:39,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 62.8) internal successors, (314), 5 states have internal predecessors, (314), 3 states have call successors, (223), 3 states have call predecessors, (223), 3 states have return successors, (222), 3 states have call predecessors, (222), 3 states have call successors, (222) [2021-11-21 01:55:39,388 INFO L276 IsEmpty]: Start isEmpty. Operand 7482 states and 11333 transitions. [2021-11-21 01:55:39,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 979 [2021-11-21 01:55:39,428 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:39,429 INFO L514 BasicCegarLoop]: trace histogram [214, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:55:39,479 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:55:39,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:39,657 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:55:39,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:39,658 INFO L85 PathProgramCache]: Analyzing trace with hash 44790122, now seen corresponding path program 1 times [2021-11-21 01:55:39,658 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:39,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207427646] [2021-11-21 01:55:39,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:39,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:39,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:40,599 INFO L134 CoverageAnalysis]: Checked inductivity of 45590 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 45585 trivial. 0 not checked. [2021-11-21 01:55:40,600 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:40,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207427646] [2021-11-21 01:55:40,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207427646] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:55:40,601 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:55:40,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 01:55:40,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111671729] [2021-11-21 01:55:40,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:55:40,603 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:55:40,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:40,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:55:40,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:55:40,606 INFO L87 Difference]: Start difference. First operand 7482 states and 11333 transitions. Second operand has 6 states, 6 states have (on average 52.166666666666664) internal successors, (313), 6 states have internal predecessors, (313), 4 states have call successors, (226), 2 states have call predecessors, (226), 4 states have return successors, (225), 4 states have call predecessors, (225), 4 states have call successors, (225) [2021-11-21 01:55:42,624 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:55:44,788 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.09s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:56:06,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:56:06,666 INFO L93 Difference]: Finished difference Result 11798 states and 17903 transitions. [2021-11-21 01:56:06,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:56:06,672 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 52.166666666666664) internal successors, (313), 6 states have internal predecessors, (313), 4 states have call successors, (226), 2 states have call predecessors, (226), 4 states have return successors, (225), 4 states have call predecessors, (225), 4 states have call successors, (225) Word has length 978 [2021-11-21 01:56:06,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:56:06,717 INFO L225 Difference]: With dead ends: 11798 [2021-11-21 01:56:06,718 INFO L226 Difference]: Without dead ends: 6397 [2021-11-21 01:56:06,744 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:56:06,745 INFO L933 BasicCegarLoop]: 4220 mSDtfsCounter, 3600 mSDsluCounter, 5798 mSDsCounter, 0 mSdLazyCounter, 2370 mSolverCounterSat, 470 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3600 SdHoareTripleChecker+Valid, 9893 SdHoareTripleChecker+Invalid, 2842 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 470 IncrementalHoareTripleChecker+Valid, 2370 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:56:06,745 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3600 Valid, 9893 Invalid, 2842 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [470 Valid, 2370 Invalid, 2 Unknown, 0 Unchecked, 25.5s Time] [2021-11-21 01:56:06,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6397 states. [2021-11-21 01:56:08,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6397 to 6072. [2021-11-21 01:56:08,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6072 states, 3772 states have (on average 1.255302226935313) internal successors, (4735), 3844 states have internal predecessors, (4735), 2177 states have call successors, (2177), 114 states have call predecessors, (2177), 122 states have return successors, (2226), 2118 states have call predecessors, (2226), 2176 states have call successors, (2226) [2021-11-21 01:56:08,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6072 states to 6072 states and 9138 transitions. [2021-11-21 01:56:08,122 INFO L78 Accepts]: Start accepts. Automaton has 6072 states and 9138 transitions. Word has length 978 [2021-11-21 01:56:08,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:56:08,124 INFO L470 AbstractCegarLoop]: Abstraction has 6072 states and 9138 transitions. [2021-11-21 01:56:08,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 52.166666666666664) internal successors, (313), 6 states have internal predecessors, (313), 4 states have call successors, (226), 2 states have call predecessors, (226), 4 states have return successors, (225), 4 states have call predecessors, (225), 4 states have call successors, (225) [2021-11-21 01:56:08,125 INFO L276 IsEmpty]: Start isEmpty. Operand 6072 states and 9138 transitions. [2021-11-21 01:56:08,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 980 [2021-11-21 01:56:08,155 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:56:08,156 INFO L514 BasicCegarLoop]: trace histogram [214, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:56:08,157 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-21 01:56:08,157 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:56:08,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:56:08,158 INFO L85 PathProgramCache]: Analyzing trace with hash -1190363228, now seen corresponding path program 1 times [2021-11-21 01:56:08,159 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:56:08,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [32267082] [2021-11-21 01:56:08,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:08,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:56:08,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:09,035 INFO L134 CoverageAnalysis]: Checked inductivity of 45595 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 45593 trivial. 0 not checked. [2021-11-21 01:56:09,035 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:56:09,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [32267082] [2021-11-21 01:56:09,035 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [32267082] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:56:09,035 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:56:09,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:56:09,036 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388497705] [2021-11-21 01:56:09,036 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:56:09,038 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:56:09,038 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:56:09,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:56:09,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:56:09,039 INFO L87 Difference]: Start difference. First operand 6072 states and 9138 transitions. Second operand has 5 states, 5 states have (on average 61.6) internal successors, (308), 4 states have internal predecessors, (308), 2 states have call successors, (226), 2 states have call predecessors, (226), 1 states have return successors, (225), 2 states have call predecessors, (225), 2 states have call successors, (225) [2021-11-21 01:56:11,055 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:56:13,121 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:56:14,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:56:14,337 INFO L93 Difference]: Finished difference Result 7977 states and 12061 transitions. [2021-11-21 01:56:14,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:56:14,338 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 61.6) internal successors, (308), 4 states have internal predecessors, (308), 2 states have call successors, (226), 2 states have call predecessors, (226), 1 states have return successors, (225), 2 states have call predecessors, (225), 2 states have call successors, (225) Word has length 979 [2021-11-21 01:56:14,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:56:14,393 INFO L225 Difference]: With dead ends: 7977 [2021-11-21 01:56:14,394 INFO L226 Difference]: Without dead ends: 7975 [2021-11-21 01:56:14,402 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:56:14,403 INFO L933 BasicCegarLoop]: 4640 mSDtfsCounter, 2499 mSDsluCounter, 11942 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 2 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2501 SdHoareTripleChecker+Valid, 16470 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2021-11-21 01:56:14,403 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2501 Valid, 16470 Invalid, 220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 216 Invalid, 2 Unknown, 0 Unchecked, 4.9s Time] [2021-11-21 01:56:14,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7975 states. [2021-11-21 01:56:16,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7975 to 7970. [2021-11-21 01:56:16,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7970 states, 4900 states have (on average 1.2520408163265306) internal successors, (6135), 5021 states have internal predecessors, (6135), 2915 states have call successors, (2915), 144 states have call predecessors, (2915), 154 states have return successors, (3005), 2811 states have call predecessors, (3005), 2914 states have call successors, (3005) [2021-11-21 01:56:16,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7970 states to 7970 states and 12055 transitions. [2021-11-21 01:56:16,601 INFO L78 Accepts]: Start accepts. Automaton has 7970 states and 12055 transitions. Word has length 979 [2021-11-21 01:56:16,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:56:16,603 INFO L470 AbstractCegarLoop]: Abstraction has 7970 states and 12055 transitions. [2021-11-21 01:56:16,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 61.6) internal successors, (308), 4 states have internal predecessors, (308), 2 states have call successors, (226), 2 states have call predecessors, (226), 1 states have return successors, (225), 2 states have call predecessors, (225), 2 states have call successors, (225) [2021-11-21 01:56:16,604 INFO L276 IsEmpty]: Start isEmpty. Operand 7970 states and 12055 transitions. [2021-11-21 01:56:16,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 978 [2021-11-21 01:56:16,633 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:56:16,634 INFO L514 BasicCegarLoop]: trace histogram [210, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:56:16,634 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-21 01:56:16,635 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:56:16,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:56:16,636 INFO L85 PathProgramCache]: Analyzing trace with hash 843437378, now seen corresponding path program 1 times [2021-11-21 01:56:16,637 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:56:16,637 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9305735] [2021-11-21 01:56:16,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:16,638 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:56:16,875 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:56:16,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1861676096] [2021-11-21 01:56:16,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:16,877 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:16,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:56:16,878 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:56:16,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:56:18,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:18,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 3259 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:56:18,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:56:20,461 INFO L134 CoverageAnalysis]: Checked inductivity of 43900 backedges. 832 proven. 0 refuted. 0 times theorem prover too weak. 43068 trivial. 0 not checked. [2021-11-21 01:56:20,461 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:56:20,461 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:56:20,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9305735] [2021-11-21 01:56:20,462 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:56:20,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1861676096] [2021-11-21 01:56:20,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1861676096] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:56:20,462 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:56:20,463 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:56:20,463 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999250355] [2021-11-21 01:56:20,463 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:56:20,465 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:56:20,466 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:56:20,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:56:20,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:56:20,467 INFO L87 Difference]: Start difference. First operand 7970 states and 12055 transitions. Second operand has 5 states, 5 states have (on average 63.0) internal successors, (315), 5 states have internal predecessors, (315), 3 states have call successors, (224), 3 states have call predecessors, (224), 3 states have return successors, (223), 3 states have call predecessors, (223), 3 states have call successors, (223) [2021-11-21 01:56:22,484 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:56:24,590 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:56:40,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:56:40,428 INFO L93 Difference]: Finished difference Result 15227 states and 23165 transitions. [2021-11-21 01:56:40,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:56:40,432 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 63.0) internal successors, (315), 5 states have internal predecessors, (315), 3 states have call successors, (224), 3 states have call predecessors, (224), 3 states have return successors, (223), 3 states have call predecessors, (223), 3 states have call successors, (223) Word has length 977 [2021-11-21 01:56:40,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:56:40,481 INFO L225 Difference]: With dead ends: 15227 [2021-11-21 01:56:40,481 INFO L226 Difference]: Without dead ends: 8281 [2021-11-21 01:56:40,512 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 977 GetRequests, 973 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:56:40,513 INFO L933 BasicCegarLoop]: 3715 mSDtfsCounter, 2147 mSDsluCounter, 5359 mSDsCounter, 0 mSdLazyCounter, 2558 mSolverCounterSat, 26 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2148 SdHoareTripleChecker+Valid, 8997 SdHoareTripleChecker+Invalid, 2586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 2558 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:56:40,513 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2148 Valid, 8997 Invalid, 2586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 2558 Invalid, 2 Unknown, 0 Unchecked, 19.4s Time] [2021-11-21 01:56:40,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8281 states. [2021-11-21 01:56:41,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8281 to 7958. [2021-11-21 01:56:41,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7958 states, 4894 states have (on average 1.2511238250919494) internal successors, (6123), 5015 states have internal predecessors, (6123), 2909 states have call successors, (2909), 144 states have call predecessors, (2909), 154 states have return successors, (2999), 2805 states have call predecessors, (2999), 2908 states have call successors, (2999) [2021-11-21 01:56:41,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7958 states to 7958 states and 12031 transitions. [2021-11-21 01:56:41,669 INFO L78 Accepts]: Start accepts. Automaton has 7958 states and 12031 transitions. Word has length 977 [2021-11-21 01:56:41,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:56:41,671 INFO L470 AbstractCegarLoop]: Abstraction has 7958 states and 12031 transitions. [2021-11-21 01:56:41,671 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 63.0) internal successors, (315), 5 states have internal predecessors, (315), 3 states have call successors, (224), 3 states have call predecessors, (224), 3 states have return successors, (223), 3 states have call predecessors, (223), 3 states have call successors, (223) [2021-11-21 01:56:41,671 INFO L276 IsEmpty]: Start isEmpty. Operand 7958 states and 12031 transitions. [2021-11-21 01:56:41,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 978 [2021-11-21 01:56:41,692 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:56:41,693 INFO L514 BasicCegarLoop]: trace histogram [210, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:56:41,737 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:56:41,921 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-21 01:56:41,922 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:56:41,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:56:41,923 INFO L85 PathProgramCache]: Analyzing trace with hash -910510413, now seen corresponding path program 1 times [2021-11-21 01:56:41,923 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:56:41,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [93058111] [2021-11-21 01:56:41,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:41,923 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:56:42,111 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:56:42,111 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [311799921] [2021-11-21 01:56:42,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:42,112 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:42,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:56:42,113 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:56:42,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:56:42,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:42,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 3258 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:56:43,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:56:45,029 INFO L134 CoverageAnalysis]: Checked inductivity of 43902 backedges. 836 proven. 0 refuted. 0 times theorem prover too weak. 43066 trivial. 0 not checked. [2021-11-21 01:56:45,029 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:56:45,029 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:56:45,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [93058111] [2021-11-21 01:56:45,030 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:56:45,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [311799921] [2021-11-21 01:56:45,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [311799921] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:56:45,030 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:56:45,031 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:56:45,031 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098035082] [2021-11-21 01:56:45,031 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:56:45,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:56:45,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:56:45,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:56:45,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:56:45,034 INFO L87 Difference]: Start difference. First operand 7958 states and 12031 transitions. Second operand has 5 states, 5 states have (on average 63.6) internal successors, (318), 5 states have internal predecessors, (318), 3 states have call successors, (224), 3 states have call predecessors, (224), 3 states have return successors, (223), 3 states have call predecessors, (223), 3 states have call successors, (223) [2021-11-21 01:56:47,049 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:56:49,176 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:57:00,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:00,259 INFO L93 Difference]: Finished difference Result 14878 states and 22653 transitions. [2021-11-21 01:57:00,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:57:00,263 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 63.6) internal successors, (318), 5 states have internal predecessors, (318), 3 states have call successors, (224), 3 states have call predecessors, (224), 3 states have return successors, (223), 3 states have call predecessors, (223), 3 states have call successors, (223) Word has length 977 [2021-11-21 01:57:00,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:00,307 INFO L225 Difference]: With dead ends: 14878 [2021-11-21 01:57:00,307 INFO L226 Difference]: Without dead ends: 8281 [2021-11-21 01:57:00,336 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 977 GetRequests, 973 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:57:00,337 INFO L933 BasicCegarLoop]: 3835 mSDtfsCounter, 1672 mSDsluCounter, 8107 mSDsCounter, 0 mSdLazyCounter, 2061 mSolverCounterSat, 32 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1675 SdHoareTripleChecker+Valid, 11856 SdHoareTripleChecker+Invalid, 2095 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 2061 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:00,337 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1675 Valid, 11856 Invalid, 2095 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 2061 Invalid, 2 Unknown, 0 Unchecked, 14.7s Time] [2021-11-21 01:57:00,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8281 states. [2021-11-21 01:57:01,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8281 to 8260. [2021-11-21 01:57:01,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8260 states, 5105 states have (on average 1.2526934378060726) internal successors, (6395), 5228 states have internal predecessors, (6395), 2990 states have call successors, (2990), 153 states have call predecessors, (2990), 164 states have return successors, (3081), 2885 states have call predecessors, (3081), 2989 states have call successors, (3081) [2021-11-21 01:57:01,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8260 states to 8260 states and 12466 transitions. [2021-11-21 01:57:01,758 INFO L78 Accepts]: Start accepts. Automaton has 8260 states and 12466 transitions. Word has length 977 [2021-11-21 01:57:01,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:01,759 INFO L470 AbstractCegarLoop]: Abstraction has 8260 states and 12466 transitions. [2021-11-21 01:57:01,759 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 63.6) internal successors, (318), 5 states have internal predecessors, (318), 3 states have call successors, (224), 3 states have call predecessors, (224), 3 states have return successors, (223), 3 states have call predecessors, (223), 3 states have call successors, (223) [2021-11-21 01:57:01,759 INFO L276 IsEmpty]: Start isEmpty. Operand 8260 states and 12466 transitions. [2021-11-21 01:57:01,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 978 [2021-11-21 01:57:01,778 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:01,779 INFO L514 BasicCegarLoop]: trace histogram [210, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:57:01,809 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:57:01,989 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 01:57:01,989 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:57:01,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:01,990 INFO L85 PathProgramCache]: Analyzing trace with hash -561865869, now seen corresponding path program 1 times [2021-11-21 01:57:01,990 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:01,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31576190] [2021-11-21 01:57:01,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:01,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:02,155 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:57:02,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [789215983] [2021-11-21 01:57:02,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:02,156 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:02,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:02,157 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:02,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:57:02,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:02,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 3260 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:57:02,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:57:05,188 INFO L134 CoverageAnalysis]: Checked inductivity of 43904 backedges. 834 proven. 0 refuted. 0 times theorem prover too weak. 43070 trivial. 0 not checked. [2021-11-21 01:57:05,188 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:57:05,189 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:05,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31576190] [2021-11-21 01:57:05,189 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:57:05,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [789215983] [2021-11-21 01:57:05,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [789215983] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:57:05,189 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:57:05,189 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:57:05,190 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413810477] [2021-11-21 01:57:05,190 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:57:05,191 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:57:05,191 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:05,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:57:05,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:57:05,192 INFO L87 Difference]: Start difference. First operand 8260 states and 12466 transitions. Second operand has 5 states, 5 states have (on average 62.8) internal successors, (314), 5 states have internal predecessors, (314), 3 states have call successors, (224), 3 states have call predecessors, (224), 3 states have return successors, (223), 3 states have call predecessors, (223), 3 states have call successors, (223) [2021-11-21 01:57:07,203 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:57:09,260 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:57:16,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:16,974 INFO L93 Difference]: Finished difference Result 15168 states and 22928 transitions. [2021-11-21 01:57:16,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:57:16,974 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 62.8) internal successors, (314), 5 states have internal predecessors, (314), 3 states have call successors, (224), 3 states have call predecessors, (224), 3 states have return successors, (223), 3 states have call predecessors, (223), 3 states have call successors, (223) Word has length 977 [2021-11-21 01:57:16,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:17,013 INFO L225 Difference]: With dead ends: 15168 [2021-11-21 01:57:17,013 INFO L226 Difference]: Without dead ends: 8565 [2021-11-21 01:57:17,038 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 977 GetRequests, 973 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:57:17,039 INFO L933 BasicCegarLoop]: 3723 mSDtfsCounter, 931 mSDsluCounter, 9572 mSDsCounter, 0 mSdLazyCounter, 1225 mSolverCounterSat, 3 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 932 SdHoareTripleChecker+Valid, 13184 SdHoareTripleChecker+Invalid, 1230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 1225 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:17,039 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [932 Valid, 13184 Invalid, 1230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 1225 Invalid, 2 Unknown, 0 Unchecked, 11.3s Time] [2021-11-21 01:57:17,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8565 states. [2021-11-21 01:57:18,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8565 to 8544. [2021-11-21 01:57:18,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8544 states, 5304 states have (on average 1.2543363499245852) internal successors, (6653), 5429 states have internal predecessors, (6653), 3065 states have call successors, (3065), 162 states have call predecessors, (3065), 174 states have return successors, (3157), 2959 states have call predecessors, (3157), 3064 states have call successors, (3157) [2021-11-21 01:57:18,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8544 states to 8544 states and 12875 transitions. [2021-11-21 01:57:18,101 INFO L78 Accepts]: Start accepts. Automaton has 8544 states and 12875 transitions. Word has length 977 [2021-11-21 01:57:18,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:18,103 INFO L470 AbstractCegarLoop]: Abstraction has 8544 states and 12875 transitions. [2021-11-21 01:57:18,103 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 62.8) internal successors, (314), 5 states have internal predecessors, (314), 3 states have call successors, (224), 3 states have call predecessors, (224), 3 states have return successors, (223), 3 states have call predecessors, (223), 3 states have call successors, (223) [2021-11-21 01:57:18,103 INFO L276 IsEmpty]: Start isEmpty. Operand 8544 states and 12875 transitions. [2021-11-21 01:57:18,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 980 [2021-11-21 01:57:18,120 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:18,120 INFO L514 BasicCegarLoop]: trace histogram [210, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:57:18,145 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:57:18,321 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:18,321 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:57:18,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:18,322 INFO L85 PathProgramCache]: Analyzing trace with hash 1853254004, now seen corresponding path program 1 times [2021-11-21 01:57:18,322 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:18,322 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577370428] [2021-11-21 01:57:18,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:18,322 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:18,483 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:57:18,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1149791179] [2021-11-21 01:57:18,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:18,484 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:18,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:18,485 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:18,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:57:19,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:19,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 3264 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:57:19,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:57:21,406 INFO L134 CoverageAnalysis]: Checked inductivity of 43904 backedges. 835 proven. 0 refuted. 0 times theorem prover too weak. 43069 trivial. 0 not checked. [2021-11-21 01:57:21,406 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:57:21,407 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:21,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577370428] [2021-11-21 01:57:21,407 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:57:21,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149791179] [2021-11-21 01:57:21,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1149791179] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:57:21,407 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:57:21,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:57:21,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327142700] [2021-11-21 01:57:21,408 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:57:21,410 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:57:21,410 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:21,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:57:21,410 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:57:21,410 INFO L87 Difference]: Start difference. First operand 8544 states and 12875 transitions. Second operand has 5 states, 5 states have (on average 63.4) internal successors, (317), 5 states have internal predecessors, (317), 3 states have call successors, (224), 3 states have call predecessors, (224), 3 states have return successors, (223), 3 states have call predecessors, (223), 3 states have call successors, (223) [2021-11-21 01:57:23,422 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:57:25,527 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:57:44,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:57:44,876 INFO L93 Difference]: Finished difference Result 16422 states and 24848 transitions. [2021-11-21 01:57:44,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:57:44,881 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 63.4) internal successors, (317), 5 states have internal predecessors, (317), 3 states have call successors, (224), 3 states have call predecessors, (224), 3 states have return successors, (223), 3 states have call predecessors, (223), 3 states have call successors, (223) Word has length 979 [2021-11-21 01:57:44,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:57:44,912 INFO L225 Difference]: With dead ends: 16422 [2021-11-21 01:57:44,912 INFO L226 Difference]: Without dead ends: 9828 [2021-11-21 01:57:44,931 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 975 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:57:44,931 INFO L933 BasicCegarLoop]: 4638 mSDtfsCounter, 2090 mSDsluCounter, 10000 mSDsCounter, 0 mSdLazyCounter, 2649 mSolverCounterSat, 7 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2092 SdHoareTripleChecker+Valid, 14521 SdHoareTripleChecker+Invalid, 2658 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 2649 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 22.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:57:44,932 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2092 Valid, 14521 Invalid, 2658 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 2649 Invalid, 2 Unknown, 0 Unchecked, 22.7s Time] [2021-11-21 01:57:44,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9828 states. [2021-11-21 01:57:46,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9828 to 9417. [2021-11-21 01:57:46,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9417 states, 5809 states have (on average 1.2537441900499224) internal successors, (7283), 5979 states have internal predecessors, (7283), 3423 states have call successors, (3423), 171 states have call predecessors, (3423), 184 states have return successors, (3559), 3273 states have call predecessors, (3559), 3422 states have call successors, (3559) [2021-11-21 01:57:46,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9417 states to 9417 states and 14265 transitions. [2021-11-21 01:57:46,347 INFO L78 Accepts]: Start accepts. Automaton has 9417 states and 14265 transitions. Word has length 979 [2021-11-21 01:57:46,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:57:46,348 INFO L470 AbstractCegarLoop]: Abstraction has 9417 states and 14265 transitions. [2021-11-21 01:57:46,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 63.4) internal successors, (317), 5 states have internal predecessors, (317), 3 states have call successors, (224), 3 states have call predecessors, (224), 3 states have return successors, (223), 3 states have call predecessors, (223), 3 states have call successors, (223) [2021-11-21 01:57:46,349 INFO L276 IsEmpty]: Start isEmpty. Operand 9417 states and 14265 transitions. [2021-11-21 01:57:46,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 986 [2021-11-21 01:57:46,368 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:57:46,369 INFO L514 BasicCegarLoop]: trace histogram [210, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:57:46,398 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-21 01:57:46,569 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 01:57:46,570 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:57:46,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:57:46,570 INFO L85 PathProgramCache]: Analyzing trace with hash -124568013, now seen corresponding path program 1 times [2021-11-21 01:57:46,570 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:57:46,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1729972804] [2021-11-21 01:57:46,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:46,571 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:57:46,725 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:57:46,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1268000345] [2021-11-21 01:57:46,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:57:46,726 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:57:46,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:57:46,727 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:57:46,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:57:47,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:57:47,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 3282 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:57:47,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:57:49,685 INFO L134 CoverageAnalysis]: Checked inductivity of 43906 backedges. 834 proven. 0 refuted. 0 times theorem prover too weak. 43072 trivial. 0 not checked. [2021-11-21 01:57:49,685 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:57:49,685 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:57:49,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1729972804] [2021-11-21 01:57:49,685 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:57:49,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1268000345] [2021-11-21 01:57:49,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1268000345] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:57:49,686 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:57:49,686 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:57:49,686 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161829805] [2021-11-21 01:57:49,686 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:57:49,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:57:49,688 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:57:49,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:57:49,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:57:49,688 INFO L87 Difference]: Start difference. First operand 9417 states and 14265 transitions. Second operand has 5 states, 5 states have (on average 63.6) internal successors, (318), 5 states have internal predecessors, (318), 3 states have call successors, (225), 3 states have call predecessors, (225), 3 states have return successors, (224), 3 states have call predecessors, (224), 3 states have call successors, (224) [2021-11-21 01:57:51,698 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:57:53,766 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:58:14,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:14,853 INFO L93 Difference]: Finished difference Result 17470 states and 26702 transitions. [2021-11-21 01:58:14,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:58:14,859 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 63.6) internal successors, (318), 5 states have internal predecessors, (318), 3 states have call successors, (225), 3 states have call predecessors, (225), 3 states have return successors, (224), 3 states have call predecessors, (224), 3 states have call successors, (224) Word has length 985 [2021-11-21 01:58:14,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:14,890 INFO L225 Difference]: With dead ends: 17470 [2021-11-21 01:58:14,890 INFO L226 Difference]: Without dead ends: 9418 [2021-11-21 01:58:14,916 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 985 GetRequests, 981 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:58:14,917 INFO L933 BasicCegarLoop]: 3711 mSDtfsCounter, 2130 mSDsluCounter, 5345 mSDsCounter, 0 mSdLazyCounter, 2552 mSolverCounterSat, 26 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2131 SdHoareTripleChecker+Valid, 8979 SdHoareTripleChecker+Invalid, 2580 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 2552 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:14,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2131 Valid, 8979 Invalid, 2580 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 2552 Invalid, 2 Unknown, 0 Unchecked, 24.5s Time] [2021-11-21 01:58:14,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9418 states. [2021-11-21 01:58:16,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9418 to 9397. [2021-11-21 01:58:16,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9397 states, 5799 states have (on average 1.2524573202276255) internal successors, (7263), 5969 states have internal predecessors, (7263), 3413 states have call successors, (3413), 171 states have call predecessors, (3413), 184 states have return successors, (3549), 3263 states have call predecessors, (3549), 3412 states have call successors, (3549) [2021-11-21 01:58:16,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9397 states to 9397 states and 14225 transitions. [2021-11-21 01:58:16,425 INFO L78 Accepts]: Start accepts. Automaton has 9397 states and 14225 transitions. Word has length 985 [2021-11-21 01:58:16,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:16,427 INFO L470 AbstractCegarLoop]: Abstraction has 9397 states and 14225 transitions. [2021-11-21 01:58:16,427 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 63.6) internal successors, (318), 5 states have internal predecessors, (318), 3 states have call successors, (225), 3 states have call predecessors, (225), 3 states have return successors, (224), 3 states have call predecessors, (224), 3 states have call successors, (224) [2021-11-21 01:58:16,427 INFO L276 IsEmpty]: Start isEmpty. Operand 9397 states and 14225 transitions. [2021-11-21 01:58:16,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 986 [2021-11-21 01:58:16,443 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:16,444 INFO L514 BasicCegarLoop]: trace histogram [210, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:16,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:16,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 01:58:16,657 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:16,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:16,658 INFO L85 PathProgramCache]: Analyzing trace with hash -419257197, now seen corresponding path program 1 times [2021-11-21 01:58:16,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:16,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1480002722] [2021-11-21 01:58:16,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:16,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:16,848 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:16,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [413235577] [2021-11-21 01:58:16,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:16,848 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:16,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:16,849 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:16,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:58:17,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:17,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 3280 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:58:17,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:19,776 INFO L134 CoverageAnalysis]: Checked inductivity of 43914 backedges. 846 proven. 0 refuted. 0 times theorem prover too weak. 43068 trivial. 0 not checked. [2021-11-21 01:58:19,776 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:58:19,776 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:19,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1480002722] [2021-11-21 01:58:19,777 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:19,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [413235577] [2021-11-21 01:58:19,777 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [413235577] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:58:19,777 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:58:19,778 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:58:19,778 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115359457] [2021-11-21 01:58:19,778 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:58:19,780 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:58:19,780 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:19,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:58:19,781 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:58:19,781 INFO L87 Difference]: Start difference. First operand 9397 states and 14225 transitions. Second operand has 5 states, 5 states have (on average 64.4) internal successors, (322), 5 states have internal predecessors, (322), 3 states have call successors, (226), 3 states have call predecessors, (226), 3 states have return successors, (225), 3 states have call predecessors, (225), 3 states have call successors, (225) [2021-11-21 01:58:21,805 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:58:24,056 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:58:37,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:37,431 INFO L93 Difference]: Finished difference Result 16757 states and 25629 transitions. [2021-11-21 01:58:37,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:58:37,436 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 64.4) internal successors, (322), 5 states have internal predecessors, (322), 3 states have call successors, (226), 3 states have call predecessors, (226), 3 states have return successors, (225), 3 states have call predecessors, (225), 3 states have call successors, (225) Word has length 985 [2021-11-21 01:58:37,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:37,468 INFO L225 Difference]: With dead ends: 16757 [2021-11-21 01:58:37,468 INFO L226 Difference]: Without dead ends: 9418 [2021-11-21 01:58:37,494 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 985 GetRequests, 981 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:58:37,495 INFO L933 BasicCegarLoop]: 3824 mSDtfsCounter, 1642 mSDsluCounter, 8082 mSDsCounter, 0 mSdLazyCounter, 2053 mSolverCounterSat, 32 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1645 SdHoareTripleChecker+Valid, 11822 SdHoareTripleChecker+Invalid, 2087 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 2053 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:37,495 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1645 Valid, 11822 Invalid, 2087 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 2053 Invalid, 2 Unknown, 0 Unchecked, 17.1s Time] [2021-11-21 01:58:37,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9418 states. [2021-11-21 01:58:38,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9418 to 9397. [2021-11-21 01:58:38,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9397 states, 5799 states have (on average 1.2510777720296602) internal successors, (7255), 5969 states have internal predecessors, (7255), 3413 states have call successors, (3413), 171 states have call predecessors, (3413), 184 states have return successors, (3549), 3263 states have call predecessors, (3549), 3412 states have call successors, (3549) [2021-11-21 01:58:38,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9397 states to 9397 states and 14217 transitions. [2021-11-21 01:58:38,841 INFO L78 Accepts]: Start accepts. Automaton has 9397 states and 14217 transitions. Word has length 985 [2021-11-21 01:58:38,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:38,842 INFO L470 AbstractCegarLoop]: Abstraction has 9397 states and 14217 transitions. [2021-11-21 01:58:38,843 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 64.4) internal successors, (322), 5 states have internal predecessors, (322), 3 states have call successors, (226), 3 states have call predecessors, (226), 3 states have return successors, (225), 3 states have call predecessors, (225), 3 states have call successors, (225) [2021-11-21 01:58:38,843 INFO L276 IsEmpty]: Start isEmpty. Operand 9397 states and 14217 transitions. [2021-11-21 01:58:38,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 986 [2021-11-21 01:58:38,856 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:38,857 INFO L514 BasicCegarLoop]: trace histogram [210, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:38,887 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:39,057 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:39,058 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:39,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:39,058 INFO L85 PathProgramCache]: Analyzing trace with hash 2089444083, now seen corresponding path program 1 times [2021-11-21 01:58:39,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:39,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [79754693] [2021-11-21 01:58:39,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:39,059 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:39,209 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:39,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [569206680] [2021-11-21 01:58:39,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:39,209 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:39,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:39,210 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:39,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 01:58:39,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:39,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 3284 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:58:39,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:42,438 INFO L134 CoverageAnalysis]: Checked inductivity of 43924 backedges. 850 proven. 0 refuted. 0 times theorem prover too weak. 43074 trivial. 0 not checked. [2021-11-21 01:58:42,438 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:58:42,438 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:42,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [79754693] [2021-11-21 01:58:42,439 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:42,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [569206680] [2021-11-21 01:58:42,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [569206680] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:58:42,439 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:58:42,439 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:58:42,440 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547494969] [2021-11-21 01:58:42,440 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:58:42,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:58:42,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:42,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:58:42,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:58:42,442 INFO L87 Difference]: Start difference. First operand 9397 states and 14217 transitions. Second operand has 5 states, 5 states have (on average 63.6) internal successors, (318), 5 states have internal predecessors, (318), 3 states have call successors, (226), 3 states have call predecessors, (226), 3 states have return successors, (225), 3 states have call predecessors, (225), 3 states have call successors, (225) [2021-11-21 01:58:44,455 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:58:46,534 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:58:56,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:56,467 INFO L93 Difference]: Finished difference Result 16743 states and 25413 transitions. [2021-11-21 01:58:56,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:58:56,467 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 63.6) internal successors, (318), 5 states have internal predecessors, (318), 3 states have call successors, (226), 3 states have call predecessors, (226), 3 states have return successors, (225), 3 states have call predecessors, (225), 3 states have call successors, (225) Word has length 985 [2021-11-21 01:58:56,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:56,496 INFO L225 Difference]: With dead ends: 16743 [2021-11-21 01:58:56,496 INFO L226 Difference]: Without dead ends: 9292 [2021-11-21 01:58:56,517 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 985 GetRequests, 981 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:58:56,517 INFO L933 BasicCegarLoop]: 3709 mSDtfsCounter, 900 mSDsluCounter, 6765 mSDsCounter, 0 mSdLazyCounter, 1143 mSolverCounterSat, 3 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 901 SdHoareTripleChecker+Valid, 10383 SdHoareTripleChecker+Invalid, 1148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 1143 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:56,518 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [901 Valid, 10383 Invalid, 1148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 1143 Invalid, 2 Unknown, 0 Unchecked, 13.5s Time] [2021-11-21 01:58:56,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9292 states. [2021-11-21 01:58:57,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9292 to 9271. [2021-11-21 01:58:57,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9271 states, 5707 states have (on average 1.248466795163834) internal successors, (7125), 5877 states have internal predecessors, (7125), 3381 states have call successors, (3381), 169 states have call predecessors, (3381), 182 states have return successors, (3517), 3231 states have call predecessors, (3517), 3380 states have call successors, (3517) [2021-11-21 01:58:57,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9271 states to 9271 states and 14023 transitions. [2021-11-21 01:58:57,694 INFO L78 Accepts]: Start accepts. Automaton has 9271 states and 14023 transitions. Word has length 985 [2021-11-21 01:58:57,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:57,695 INFO L470 AbstractCegarLoop]: Abstraction has 9271 states and 14023 transitions. [2021-11-21 01:58:57,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 63.6) internal successors, (318), 5 states have internal predecessors, (318), 3 states have call successors, (226), 3 states have call predecessors, (226), 3 states have return successors, (225), 3 states have call predecessors, (225), 3 states have call successors, (225) [2021-11-21 01:58:57,696 INFO L276 IsEmpty]: Start isEmpty. Operand 9271 states and 14023 transitions. [2021-11-21 01:58:57,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 990 [2021-11-21 01:58:57,709 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:57,710 INFO L514 BasicCegarLoop]: trace histogram [210, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:57,735 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:57,910 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-21 01:58:57,910 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:57,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:57,911 INFO L85 PathProgramCache]: Analyzing trace with hash 762798974, now seen corresponding path program 1 times [2021-11-21 01:58:57,911 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:57,911 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558373125] [2021-11-21 01:58:57,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:57,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:58,139 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:58,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [32302375] [2021-11-21 01:58:58,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:58,140 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:58,140 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:58,141 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:58,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 01:58:58,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:58,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 3292 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:58:58,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:01,265 INFO L134 CoverageAnalysis]: Checked inductivity of 43914 backedges. 846 proven. 0 refuted. 0 times theorem prover too weak. 43068 trivial. 0 not checked. [2021-11-21 01:59:01,265 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:59:01,265 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:01,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558373125] [2021-11-21 01:59:01,265 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:59:01,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [32302375] [2021-11-21 01:59:01,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [32302375] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:01,266 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:59:01,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:59:01,267 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037697571] [2021-11-21 01:59:01,267 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:01,268 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:59:01,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:01,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:59:01,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:59:01,269 INFO L87 Difference]: Start difference. First operand 9271 states and 14023 transitions. Second operand has 5 states, 5 states have (on average 64.8) internal successors, (324), 5 states have internal predecessors, (324), 3 states have call successors, (227), 3 states have call predecessors, (227), 3 states have return successors, (226), 3 states have call predecessors, (226), 3 states have call successors, (226) [2021-11-21 01:59:03,294 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:59:05,428 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 01:59:30,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:30,338 INFO L93 Difference]: Finished difference Result 16837 states and 25708 transitions. [2021-11-21 01:59:30,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:59:30,344 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 64.8) internal successors, (324), 5 states have internal predecessors, (324), 3 states have call successors, (227), 3 states have call predecessors, (227), 3 states have return successors, (226), 3 states have call predecessors, (226), 3 states have call successors, (226) Word has length 989 [2021-11-21 01:59:30,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:30,372 INFO L225 Difference]: With dead ends: 16837 [2021-11-21 01:59:30,372 INFO L226 Difference]: Without dead ends: 8818 [2021-11-21 01:59:30,498 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 989 GetRequests, 985 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:59:30,499 INFO L933 BasicCegarLoop]: 3708 mSDtfsCounter, 2100 mSDsluCounter, 6908 mSDsCounter, 0 mSdLazyCounter, 2571 mSolverCounterSat, 27 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 21.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2101 SdHoareTripleChecker+Valid, 10529 SdHoareTripleChecker+Invalid, 2600 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 2571 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 28.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:30,499 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2101 Valid, 10529 Invalid, 2600 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 2571 Invalid, 2 Unknown, 0 Unchecked, 28.4s Time] [2021-11-21 01:59:30,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8818 states. [2021-11-21 01:59:31,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8818 to 8795. [2021-11-21 01:59:31,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8795 states, 5357 states have (on average 1.2404330782154191) internal successors, (6645), 5527 states have internal predecessors, (6645), 3259 states have call successors, (3259), 165 states have call predecessors, (3259), 178 states have return successors, (3395), 3109 states have call predecessors, (3395), 3258 states have call successors, (3395) [2021-11-21 01:59:31,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8795 states to 8795 states and 13299 transitions. [2021-11-21 01:59:31,751 INFO L78 Accepts]: Start accepts. Automaton has 8795 states and 13299 transitions. Word has length 989 [2021-11-21 01:59:31,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:31,752 INFO L470 AbstractCegarLoop]: Abstraction has 8795 states and 13299 transitions. [2021-11-21 01:59:31,752 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 64.8) internal successors, (324), 5 states have internal predecessors, (324), 3 states have call successors, (227), 3 states have call predecessors, (227), 3 states have return successors, (226), 3 states have call predecessors, (226), 3 states have call successors, (226) [2021-11-21 01:59:31,753 INFO L276 IsEmpty]: Start isEmpty. Operand 8795 states and 13299 transitions. [2021-11-21 01:59:31,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 990 [2021-11-21 01:59:31,765 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:31,766 INFO L514 BasicCegarLoop]: trace histogram [210, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:31,794 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-11-21 01:59:31,966 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:31,967 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:31,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:31,967 INFO L85 PathProgramCache]: Analyzing trace with hash 1975372463, now seen corresponding path program 1 times [2021-11-21 01:59:31,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:31,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032802946] [2021-11-21 01:59:31,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:31,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:32,129 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:59:32,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2007055079] [2021-11-21 01:59:32,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:32,130 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:32,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:32,132 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:32,156 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06bf67f7-7637-4d12-9c73-bf73026902ad/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 01:59:32,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:32,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 3291 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-21 01:59:33,025 INFO L286 TraceCheckSpWp]: Computing forward predicates...