./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrchr-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 57096758 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrchr-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 276936ba1494f32a328b3de86f664a380d5263e9 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-5709675 [2021-10-15 20:15:54,470 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-15 20:15:54,473 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-15 20:15:54,506 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-15 20:15:54,507 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-15 20:15:54,508 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-15 20:15:54,510 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-15 20:15:54,512 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-15 20:15:54,515 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-15 20:15:54,516 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-15 20:15:54,517 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-15 20:15:54,519 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-15 20:15:54,519 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-15 20:15:54,521 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-15 20:15:54,522 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-15 20:15:54,524 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-15 20:15:54,525 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-15 20:15:54,527 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-15 20:15:54,529 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-15 20:15:54,532 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-15 20:15:54,534 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-15 20:15:54,536 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-15 20:15:54,537 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-15 20:15:54,538 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-15 20:15:54,542 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-15 20:15:54,543 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-15 20:15:54,543 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-15 20:15:54,544 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-15 20:15:54,545 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-15 20:15:54,546 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-15 20:15:54,547 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-15 20:15:54,548 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-15 20:15:54,549 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-15 20:15:54,550 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-15 20:15:54,551 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-15 20:15:54,551 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-15 20:15:54,552 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-15 20:15:54,553 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-15 20:15:54,553 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-15 20:15:54,554 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-15 20:15:54,555 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-15 20:15:54,556 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-10-15 20:15:54,581 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-15 20:15:54,581 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-15 20:15:54,582 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-10-15 20:15:54,582 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-10-15 20:15:54,583 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-15 20:15:54,584 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-15 20:15:54,584 INFO L138 SettingsManager]: * Use SBE=true [2021-10-15 20:15:54,585 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-15 20:15:54,585 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-15 20:15:54,586 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-10-15 20:15:54,586 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-15 20:15:54,586 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-15 20:15:54,587 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-15 20:15:54,587 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-10-15 20:15:54,587 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-10-15 20:15:54,587 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-10-15 20:15:54,588 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-15 20:15:54,588 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-15 20:15:54,588 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-15 20:15:54,588 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-15 20:15:54,588 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-15 20:15:54,589 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-15 20:15:54,589 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-15 20:15:54,589 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-15 20:15:54,589 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-15 20:15:54,590 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-15 20:15:54,590 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-10-15 20:15:54,590 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-15 20:15:54,590 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-15 20:15:54,591 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 276936ba1494f32a328b3de86f664a380d5263e9 [2021-10-15 20:15:54,841 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-15 20:15:54,862 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-15 20:15:54,865 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-15 20:15:54,866 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-15 20:15:54,867 INFO L275 PluginConnector]: CDTParser initialized [2021-10-15 20:15:54,868 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/../../sv-benchmarks/c/array-memsafety/cstrchr-alloca-2.i [2021-10-15 20:15:54,935 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/data/b246d9044/8f6f780beafc4550a240247986a75127/FLAGd2066559e [2021-10-15 20:15:55,449 INFO L306 CDTParser]: Found 1 translation units. [2021-10-15 20:15:55,452 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/sv-benchmarks/c/array-memsafety/cstrchr-alloca-2.i [2021-10-15 20:15:55,467 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/data/b246d9044/8f6f780beafc4550a240247986a75127/FLAGd2066559e [2021-10-15 20:15:55,768 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/data/b246d9044/8f6f780beafc4550a240247986a75127 [2021-10-15 20:15:55,770 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-15 20:15:55,772 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-10-15 20:15:55,774 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-15 20:15:55,774 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-15 20:15:55,778 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-15 20:15:55,779 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 08:15:55" (1/1) ... [2021-10-15 20:15:55,780 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6671f864 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:15:55, skipping insertion in model container [2021-10-15 20:15:55,780 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 08:15:55" (1/1) ... [2021-10-15 20:15:55,788 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-15 20:15:55,826 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-15 20:15:56,122 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-15 20:15:56,131 INFO L203 MainTranslator]: Completed pre-run [2021-10-15 20:15:56,167 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-15 20:15:56,206 INFO L208 MainTranslator]: Completed translation [2021-10-15 20:15:56,207 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:15:56 WrapperNode [2021-10-15 20:15:56,207 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-15 20:15:56,208 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-15 20:15:56,208 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-15 20:15:56,208 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-15 20:15:56,220 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:15:56" (1/1) ... [2021-10-15 20:15:56,222 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:15:56" (1/1) ... [2021-10-15 20:15:56,248 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:15:56" (1/1) ... [2021-10-15 20:15:56,248 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:15:56" (1/1) ... [2021-10-15 20:15:56,276 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:15:56" (1/1) ... [2021-10-15 20:15:56,286 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:15:56" (1/1) ... [2021-10-15 20:15:56,289 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:15:56" (1/1) ... [2021-10-15 20:15:56,305 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-15 20:15:56,306 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-15 20:15:56,307 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-15 20:15:56,307 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-15 20:15:56,313 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:15:56" (1/1) ... [2021-10-15 20:15:56,322 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-15 20:15:56,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:15:56,354 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-15 20:15:56,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-15 20:15:56,404 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-10-15 20:15:56,404 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-15 20:15:56,405 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-10-15 20:15:56,405 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-10-15 20:15:56,406 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2021-10-15 20:15:56,406 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2021-10-15 20:15:56,407 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2021-10-15 20:15:56,407 INFO L138 BoogieDeclarations]: Found implementation of procedure cstrchr [2021-10-15 20:15:56,408 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-10-15 20:15:56,408 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-10-15 20:15:56,408 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-10-15 20:15:56,409 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-10-15 20:15:56,409 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-10-15 20:15:56,410 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-10-15 20:15:56,410 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-10-15 20:15:56,410 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-10-15 20:15:56,410 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-10-15 20:15:56,411 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-10-15 20:15:56,411 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-10-15 20:15:56,411 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-10-15 20:15:56,411 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-10-15 20:15:56,411 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-10-15 20:15:56,412 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-10-15 20:15:56,412 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-10-15 20:15:56,412 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-10-15 20:15:56,412 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-10-15 20:15:56,412 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-10-15 20:15:56,413 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2021-10-15 20:15:56,413 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2021-10-15 20:15:56,413 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2021-10-15 20:15:56,413 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-10-15 20:15:56,413 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-10-15 20:15:56,414 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-10-15 20:15:56,414 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-10-15 20:15:56,414 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-10-15 20:15:56,414 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-10-15 20:15:56,414 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-10-15 20:15:56,415 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-10-15 20:15:56,415 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-10-15 20:15:56,415 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-10-15 20:15:56,415 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-10-15 20:15:56,416 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-10-15 20:15:56,416 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-10-15 20:15:56,416 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-10-15 20:15:56,416 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-10-15 20:15:56,417 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-10-15 20:15:56,417 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-10-15 20:15:56,417 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-10-15 20:15:56,417 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-10-15 20:15:56,418 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-10-15 20:15:56,418 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-10-15 20:15:56,418 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-10-15 20:15:56,418 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-10-15 20:15:56,419 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-10-15 20:15:56,419 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-10-15 20:15:56,420 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-10-15 20:15:56,420 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-10-15 20:15:56,420 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-10-15 20:15:56,421 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-10-15 20:15:56,421 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-10-15 20:15:56,421 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-10-15 20:15:56,421 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-10-15 20:15:56,422 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-10-15 20:15:56,422 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-10-15 20:15:56,422 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-10-15 20:15:56,422 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-10-15 20:15:56,423 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-10-15 20:15:56,423 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-10-15 20:15:56,424 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-10-15 20:15:56,425 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-10-15 20:15:56,425 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-10-15 20:15:56,426 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-10-15 20:15:56,426 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-10-15 20:15:56,426 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-10-15 20:15:56,426 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-10-15 20:15:56,427 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-10-15 20:15:56,427 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-10-15 20:15:56,427 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-10-15 20:15:56,427 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-10-15 20:15:56,428 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-10-15 20:15:56,428 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-10-15 20:15:56,428 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-10-15 20:15:56,429 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-10-15 20:15:56,429 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-10-15 20:15:56,429 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-10-15 20:15:56,430 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-10-15 20:15:56,430 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-10-15 20:15:56,430 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-10-15 20:15:56,430 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-10-15 20:15:56,430 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-10-15 20:15:56,431 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-10-15 20:15:56,431 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-10-15 20:15:56,431 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-10-15 20:15:56,431 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-10-15 20:15:56,431 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-10-15 20:15:56,432 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-10-15 20:15:56,432 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-10-15 20:15:56,432 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-10-15 20:15:56,432 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-10-15 20:15:56,432 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-10-15 20:15:56,433 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-10-15 20:15:56,433 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-10-15 20:15:56,433 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-10-15 20:15:56,433 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-10-15 20:15:56,433 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-10-15 20:15:56,434 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-10-15 20:15:56,434 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-10-15 20:15:56,434 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-10-15 20:15:56,435 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-10-15 20:15:56,435 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-10-15 20:15:56,435 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-10-15 20:15:56,435 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-10-15 20:15:56,436 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-10-15 20:15:56,436 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-10-15 20:15:56,437 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-10-15 20:15:56,437 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-10-15 20:15:56,437 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-10-15 20:15:56,437 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2021-10-15 20:15:56,437 INFO L130 BoogieDeclarations]: Found specification of procedure cstrchr [2021-10-15 20:15:56,437 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-15 20:15:56,438 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-10-15 20:15:56,438 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-15 20:15:56,438 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-10-15 20:15:56,438 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-15 20:15:56,438 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-10-15 20:15:56,439 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-15 20:15:56,825 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-15 20:15:56,825 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-10-15 20:15:56,827 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 08:15:56 BoogieIcfgContainer [2021-10-15 20:15:56,827 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-15 20:15:56,829 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-15 20:15:56,829 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-15 20:15:56,833 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-15 20:15:56,834 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 08:15:55" (1/3) ... [2021-10-15 20:15:56,835 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@604c7b2a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 08:15:56, skipping insertion in model container [2021-10-15 20:15:56,835 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 08:15:56" (2/3) ... [2021-10-15 20:15:56,835 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@604c7b2a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 08:15:56, skipping insertion in model container [2021-10-15 20:15:56,836 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 08:15:56" (3/3) ... [2021-10-15 20:15:56,837 INFO L111 eAbstractionObserver]: Analyzing ICFG cstrchr-alloca-2.i [2021-10-15 20:15:56,843 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-15 20:15:56,843 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 11 error locations. [2021-10-15 20:15:56,895 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-15 20:15:56,901 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=false, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2021-10-15 20:15:56,902 INFO L340 AbstractCegarLoop]: Starting to check reachability of 11 error locations. [2021-10-15 20:15:56,930 INFO L276 IsEmpty]: Start isEmpty. Operand has 43 states, 25 states have (on average 1.72) internal successors, (43), 36 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-15 20:15:56,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-15 20:15:56,939 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:15:56,940 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:15:56,940 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr2REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:15:56,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:15:56,953 INFO L82 PathProgramCache]: Analyzing trace with hash 1287232828, now seen corresponding path program 1 times [2021-10-15 20:15:56,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:15:56,967 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622337005] [2021-10-15 20:15:56,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:15:56,970 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:15:57,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:57,189 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:15:57,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:57,202 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:15:57,202 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:15:57,203 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622337005] [2021-10-15 20:15:57,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [622337005] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:15:57,204 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:15:57,204 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-15 20:15:57,206 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791916905] [2021-10-15 20:15:57,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-15 20:15:57,216 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:15:57,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-15 20:15:57,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-15 20:15:57,239 INFO L87 Difference]: Start difference. First operand has 43 states, 25 states have (on average 1.72) internal successors, (43), 36 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:15:57,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:15:57,323 INFO L93 Difference]: Finished difference Result 43 states and 47 transitions. [2021-10-15 20:15:57,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-15 20:15:57,325 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-10-15 20:15:57,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:15:57,333 INFO L225 Difference]: With dead ends: 43 [2021-10-15 20:15:57,333 INFO L226 Difference]: Without dead ends: 40 [2021-10-15 20:15:57,334 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 16.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-15 20:15:57,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-10-15 20:15:57,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-10-15 20:15:57,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 24 states have (on average 1.625) internal successors, (39), 34 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-15 20:15:57,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2021-10-15 20:15:57,372 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 10 [2021-10-15 20:15:57,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:15:57,373 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2021-10-15 20:15:57,373 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:15:57,373 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2021-10-15 20:15:57,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-15 20:15:57,374 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:15:57,374 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:15:57,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-15 20:15:57,376 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr2REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:15:57,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:15:57,378 INFO L82 PathProgramCache]: Analyzing trace with hash 1287232518, now seen corresponding path program 1 times [2021-10-15 20:15:57,378 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:15:57,378 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159695658] [2021-10-15 20:15:57,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:15:57,379 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:15:57,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:57,448 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:15:57,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:57,457 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:15:57,458 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:15:57,458 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [159695658] [2021-10-15 20:15:57,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [159695658] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:15:57,458 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:15:57,459 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-15 20:15:57,459 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872492746] [2021-10-15 20:15:57,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-15 20:15:57,460 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:15:57,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-15 20:15:57,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-15 20:15:57,462 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:15:57,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:15:57,539 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2021-10-15 20:15:57,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-15 20:15:57,540 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-10-15 20:15:57,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:15:57,541 INFO L225 Difference]: With dead ends: 38 [2021-10-15 20:15:57,541 INFO L226 Difference]: Without dead ends: 38 [2021-10-15 20:15:57,542 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.0ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-15 20:15:57,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-10-15 20:15:57,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-10-15 20:15:57,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 32 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-15 20:15:57,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2021-10-15 20:15:57,547 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 10 [2021-10-15 20:15:57,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:15:57,548 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2021-10-15 20:15:57,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:15:57,548 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2021-10-15 20:15:57,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-15 20:15:57,549 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:15:57,549 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:15:57,549 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-15 20:15:57,549 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr3REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:15:57,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:15:57,550 INFO L82 PathProgramCache]: Analyzing trace with hash 1287232519, now seen corresponding path program 1 times [2021-10-15 20:15:57,550 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:15:57,551 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236846584] [2021-10-15 20:15:57,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:15:57,551 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:15:57,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:57,626 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:15:57,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:57,635 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:15:57,636 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:15:57,636 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236846584] [2021-10-15 20:15:57,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1236846584] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:15:57,636 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:15:57,637 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-10-15 20:15:57,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630020247] [2021-10-15 20:15:57,637 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-15 20:15:57,637 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:15:57,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-15 20:15:57,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-10-15 20:15:57,639 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:15:57,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:15:57,763 INFO L93 Difference]: Finished difference Result 37 states and 41 transitions. [2021-10-15 20:15:57,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-15 20:15:57,767 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-10-15 20:15:57,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:15:57,770 INFO L225 Difference]: With dead ends: 37 [2021-10-15 20:15:57,771 INFO L226 Difference]: Without dead ends: 37 [2021-10-15 20:15:57,772 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 28.9ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-10-15 20:15:57,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-10-15 20:15:57,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-10-15 20:15:57,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 24 states have (on average 1.5) internal successors, (36), 31 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-15 20:15:57,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-10-15 20:15:57,787 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 10 [2021-10-15 20:15:57,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:15:57,787 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-10-15 20:15:57,788 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:15:57,788 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-10-15 20:15:57,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-15 20:15:57,788 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:15:57,789 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:15:57,789 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-10-15 20:15:57,790 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:15:57,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:15:57,792 INFO L82 PathProgramCache]: Analyzing trace with hash 1287232572, now seen corresponding path program 1 times [2021-10-15 20:15:57,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:15:57,793 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214260901] [2021-10-15 20:15:57,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:15:57,793 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:15:57,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:57,886 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:15:57,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:57,922 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:15:57,922 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:15:57,922 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214260901] [2021-10-15 20:15:57,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [214260901] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:15:57,923 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:15:57,923 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-15 20:15:57,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812957198] [2021-10-15 20:15:57,923 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-15 20:15:57,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:15:57,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-15 20:15:57,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-10-15 20:15:57,925 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:15:58,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:15:58,030 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2021-10-15 20:15:58,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-15 20:15:58,031 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-10-15 20:15:58,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:15:58,033 INFO L225 Difference]: With dead ends: 45 [2021-10-15 20:15:58,033 INFO L226 Difference]: Without dead ends: 45 [2021-10-15 20:15:58,034 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 28.0ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-10-15 20:15:58,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-10-15 20:15:58,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 39. [2021-10-15 20:15:58,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 26 states have (on average 1.4615384615384615) internal successors, (38), 33 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-15 20:15:58,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2021-10-15 20:15:58,043 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 10 [2021-10-15 20:15:58,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:15:58,043 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2021-10-15 20:15:58,043 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:15:58,044 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2021-10-15 20:15:58,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-15 20:15:58,044 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:15:58,044 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:15:58,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-10-15 20:15:58,045 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:15:58,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:15:58,045 INFO L82 PathProgramCache]: Analyzing trace with hash 1287292154, now seen corresponding path program 1 times [2021-10-15 20:15:58,046 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:15:58,046 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [875383567] [2021-10-15 20:15:58,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:15:58,046 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:15:58,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:58,146 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:15:58,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:58,166 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:15:58,166 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:15:58,167 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [875383567] [2021-10-15 20:15:58,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [875383567] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:15:58,167 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:15:58,167 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-15 20:15:58,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078246713] [2021-10-15 20:15:58,168 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-15 20:15:58,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:15:58,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-15 20:15:58,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-10-15 20:15:58,169 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:15:58,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:15:58,295 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2021-10-15 20:15:58,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-15 20:15:58,296 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-10-15 20:15:58,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:15:58,299 INFO L225 Difference]: With dead ends: 49 [2021-10-15 20:15:58,299 INFO L226 Difference]: Without dead ends: 49 [2021-10-15 20:15:58,299 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 52.5ms TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-10-15 20:15:58,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-10-15 20:15:58,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 41. [2021-10-15 20:15:58,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 28 states have (on average 1.4642857142857142) internal successors, (41), 35 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-15 20:15:58,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2021-10-15 20:15:58,311 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 10 [2021-10-15 20:15:58,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:15:58,312 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2021-10-15 20:15:58,312 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:15:58,312 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2021-10-15 20:15:58,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-10-15 20:15:58,314 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:15:58,314 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:15:58,315 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-10-15 20:15:58,315 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting cstrchrErr0REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:15:58,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:15:58,316 INFO L82 PathProgramCache]: Analyzing trace with hash -554371049, now seen corresponding path program 1 times [2021-10-15 20:15:58,316 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:15:58,316 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1498419817] [2021-10-15 20:15:58,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:15:58,317 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:15:58,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:58,408 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:15:58,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:58,422 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:15:58,422 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:15:58,422 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1498419817] [2021-10-15 20:15:58,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1498419817] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:15:58,423 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:15:58,423 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-15 20:15:58,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297146910] [2021-10-15 20:15:58,424 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-15 20:15:58,424 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:15:58,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-15 20:15:58,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-10-15 20:15:58,426 INFO L87 Difference]: Start difference. First operand 41 states and 46 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:15:58,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:15:58,541 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2021-10-15 20:15:58,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-15 20:15:58,541 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-10-15 20:15:58,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:15:58,546 INFO L225 Difference]: With dead ends: 38 [2021-10-15 20:15:58,546 INFO L226 Difference]: Without dead ends: 38 [2021-10-15 20:15:58,547 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 40.9ms TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-10-15 20:15:58,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-10-15 20:15:58,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-10-15 20:15:58,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 28 states have (on average 1.3571428571428572) internal successors, (38), 32 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-15 20:15:58,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2021-10-15 20:15:58,564 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 14 [2021-10-15 20:15:58,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:15:58,564 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2021-10-15 20:15:58,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:15:58,565 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2021-10-15 20:15:58,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-10-15 20:15:58,566 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:15:58,566 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:15:58,566 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-10-15 20:15:58,566 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:15:58,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:15:58,567 INFO L82 PathProgramCache]: Analyzing trace with hash -554371048, now seen corresponding path program 1 times [2021-10-15 20:15:58,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:15:58,569 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988387846] [2021-10-15 20:15:58,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:15:58,572 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:15:58,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:58,732 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:15:58,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:58,739 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:15:58,740 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:15:58,741 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988387846] [2021-10-15 20:15:58,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988387846] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:15:58,741 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:15:58,741 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-15 20:15:58,742 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567279076] [2021-10-15 20:15:58,742 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-15 20:15:58,742 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:15:58,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-15 20:15:58,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-10-15 20:15:58,745 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:15:58,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:15:58,925 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2021-10-15 20:15:58,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-15 20:15:58,926 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-10-15 20:15:58,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:15:58,929 INFO L225 Difference]: With dead ends: 49 [2021-10-15 20:15:58,930 INFO L226 Difference]: Without dead ends: 49 [2021-10-15 20:15:58,934 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 89.1ms TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-10-15 20:15:58,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-10-15 20:15:58,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 45. [2021-10-15 20:15:58,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 39 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-15 20:15:58,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 52 transitions. [2021-10-15 20:15:58,947 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 52 transitions. Word has length 14 [2021-10-15 20:15:58,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:15:58,947 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 52 transitions. [2021-10-15 20:15:58,947 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:15:58,947 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 52 transitions. [2021-10-15 20:15:58,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-10-15 20:15:58,949 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:15:58,949 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:15:58,949 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-10-15 20:15:58,949 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:15:58,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:15:58,950 INFO L82 PathProgramCache]: Analyzing trace with hash -1315055555, now seen corresponding path program 1 times [2021-10-15 20:15:58,951 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:15:58,951 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1874707624] [2021-10-15 20:15:58,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:15:58,951 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:15:58,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:59,044 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:15:59,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:59,053 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:15:59,053 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:15:59,053 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1874707624] [2021-10-15 20:15:59,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1874707624] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:15:59,054 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [925944596] [2021-10-15 20:15:59,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:15:59,054 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:15:59,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:15:59,062 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:15:59,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-15 20:15:59,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:59,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 11 conjunts are in the unsatisfiable core [2021-10-15 20:15:59,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:15:59,354 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-15 20:15:59,526 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:15:59,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [925944596] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:15:59,526 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:15:59,526 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-10-15 20:15:59,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039961903] [2021-10-15 20:15:59,527 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-15 20:15:59,527 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:15:59,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-15 20:15:59,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-10-15 20:15:59,528 INFO L87 Difference]: Start difference. First operand 45 states and 52 transitions. Second operand has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:15:59,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:15:59,658 INFO L93 Difference]: Finished difference Result 52 states and 59 transitions. [2021-10-15 20:15:59,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-15 20:15:59,658 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-10-15 20:15:59,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:15:59,660 INFO L225 Difference]: With dead ends: 52 [2021-10-15 20:15:59,660 INFO L226 Difference]: Without dead ends: 52 [2021-10-15 20:15:59,660 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 67.0ms TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-10-15 20:15:59,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-10-15 20:15:59,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 42. [2021-10-15 20:15:59,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 33 states have (on average 1.303030303030303) internal successors, (43), 36 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-15 20:15:59,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2021-10-15 20:15:59,665 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 14 [2021-10-15 20:15:59,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:15:59,666 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2021-10-15 20:15:59,666 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:15:59,667 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2021-10-15 20:15:59,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-10-15 20:15:59,667 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:15:59,668 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:15:59,707 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-15 20:15:59,881 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-10-15 20:15:59,881 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:15:59,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:15:59,882 INFO L82 PathProgramCache]: Analyzing trace with hash -319565009, now seen corresponding path program 1 times [2021-10-15 20:15:59,882 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:15:59,882 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1111843646] [2021-10-15 20:15:59,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:15:59,882 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:15:59,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:59,915 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:15:59,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:15:59,937 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:15:59,937 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:15:59,937 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1111843646] [2021-10-15 20:15:59,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1111843646] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:15:59,938 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:15:59,938 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-10-15 20:15:59,938 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291087555] [2021-10-15 20:15:59,939 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-15 20:15:59,939 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:15:59,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-15 20:15:59,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-15 20:15:59,940 INFO L87 Difference]: Start difference. First operand 42 states and 48 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:15:59,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:15:59,993 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2021-10-15 20:15:59,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-15 20:15:59,994 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-10-15 20:15:59,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:15:59,995 INFO L225 Difference]: With dead ends: 44 [2021-10-15 20:15:59,995 INFO L226 Difference]: Without dead ends: 44 [2021-10-15 20:15:59,995 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-15 20:15:59,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-10-15 20:16:00,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-10-15 20:16:00,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 35 states have (on average 1.2857142857142858) internal successors, (45), 38 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-15 20:16:00,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 50 transitions. [2021-10-15 20:16:00,004 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 50 transitions. Word has length 18 [2021-10-15 20:16:00,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:16:00,005 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 50 transitions. [2021-10-15 20:16:00,005 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:00,005 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 50 transitions. [2021-10-15 20:16:00,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-10-15 20:16:00,006 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:16:00,006 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:16:00,006 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-10-15 20:16:00,006 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:16:00,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:16:00,007 INFO L82 PathProgramCache]: Analyzing trace with hash 2129811308, now seen corresponding path program 1 times [2021-10-15 20:16:00,007 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:16:00,007 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [219376203] [2021-10-15 20:16:00,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:16:00,008 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:16:00,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:00,175 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:16:00,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:00,182 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:00,182 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:16:00,182 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [219376203] [2021-10-15 20:16:00,182 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [219376203] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:16:00,183 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:16:00,183 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-10-15 20:16:00,183 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99240131] [2021-10-15 20:16:00,183 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-15 20:16:00,183 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:16:00,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-15 20:16:00,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-10-15 20:16:00,184 INFO L87 Difference]: Start difference. First operand 44 states and 50 transitions. Second operand has 10 states, 10 states have (on average 1.6) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:00,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:16:00,408 INFO L93 Difference]: Finished difference Result 60 states and 66 transitions. [2021-10-15 20:16:00,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-10-15 20:16:00,409 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.6) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-10-15 20:16:00,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:16:00,410 INFO L225 Difference]: With dead ends: 60 [2021-10-15 20:16:00,410 INFO L226 Difference]: Without dead ends: 60 [2021-10-15 20:16:00,410 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 138.2ms TimeCoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2021-10-15 20:16:00,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-10-15 20:16:00,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 57. [2021-10-15 20:16:00,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 46 states have (on average 1.2391304347826086) internal successors, (57), 50 states have internal predecessors, (57), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-15 20:16:00,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 64 transitions. [2021-10-15 20:16:00,414 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 64 transitions. Word has length 20 [2021-10-15 20:16:00,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:16:00,414 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 64 transitions. [2021-10-15 20:16:00,415 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.6) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:00,415 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 64 transitions. [2021-10-15 20:16:00,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-10-15 20:16:00,415 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:16:00,416 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:16:00,416 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-10-15 20:16:00,416 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:16:00,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:16:00,416 INFO L82 PathProgramCache]: Analyzing trace with hash 1118694058, now seen corresponding path program 1 times [2021-10-15 20:16:00,417 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:16:00,417 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674726563] [2021-10-15 20:16:00,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:16:00,417 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:16:00,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:00,547 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:16:00,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:00,553 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:00,553 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:16:00,554 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674726563] [2021-10-15 20:16:00,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674726563] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:16:00,554 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:16:00,554 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-10-15 20:16:00,554 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347683066] [2021-10-15 20:16:00,555 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-10-15 20:16:00,555 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:16:00,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-10-15 20:16:00,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-10-15 20:16:00,556 INFO L87 Difference]: Start difference. First operand 57 states and 64 transitions. Second operand has 11 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 9 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:00,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:16:00,817 INFO L93 Difference]: Finished difference Result 77 states and 85 transitions. [2021-10-15 20:16:00,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-15 20:16:00,818 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 9 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-10-15 20:16:00,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:16:00,819 INFO L225 Difference]: With dead ends: 77 [2021-10-15 20:16:00,819 INFO L226 Difference]: Without dead ends: 77 [2021-10-15 20:16:00,819 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 159.3ms TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2021-10-15 20:16:00,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-10-15 20:16:00,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 58. [2021-10-15 20:16:00,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 47 states have (on average 1.2553191489361701) internal successors, (59), 51 states have internal predecessors, (59), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-15 20:16:00,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2021-10-15 20:16:00,823 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 20 [2021-10-15 20:16:00,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:16:00,824 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2021-10-15 20:16:00,824 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 9 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:00,824 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2021-10-15 20:16:00,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-10-15 20:16:00,825 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:16:00,825 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:16:00,825 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-10-15 20:16:00,825 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting mainErr4ENSURES_VIOLATIONMEMORY_LEAK === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:16:00,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:16:00,826 INFO L82 PathProgramCache]: Analyzing trace with hash 842532891, now seen corresponding path program 1 times [2021-10-15 20:16:00,826 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:16:00,826 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [400811358] [2021-10-15 20:16:00,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:16:00,826 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:16:00,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:00,890 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:16:00,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:00,895 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-10-15 20:16:00,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:00,906 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:00,907 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:16:00,907 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [400811358] [2021-10-15 20:16:00,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [400811358] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-15 20:16:00,907 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-15 20:16:00,907 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-10-15 20:16:00,907 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429219429] [2021-10-15 20:16:00,908 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-15 20:16:00,908 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:16:00,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-15 20:16:00,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-10-15 20:16:00,909 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand has 5 states, 4 states have (on average 4.75) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-15 20:16:00,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:16:00,947 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2021-10-15 20:16:00,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-15 20:16:00,948 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.75) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2021-10-15 20:16:00,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:16:00,948 INFO L225 Difference]: With dead ends: 57 [2021-10-15 20:16:00,948 INFO L226 Difference]: Without dead ends: 34 [2021-10-15 20:16:00,949 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.2ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-10-15 20:16:00,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-10-15 20:16:00,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-10-15 20:16:00,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 29 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:00,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2021-10-15 20:16:00,958 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 24 [2021-10-15 20:16:00,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:16:00,958 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2021-10-15 20:16:00,958 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.75) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-15 20:16:00,959 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2021-10-15 20:16:00,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-10-15 20:16:00,960 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:16:00,961 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:16:00,961 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-10-15 20:16:00,961 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:16:00,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:16:00,961 INFO L82 PathProgramCache]: Analyzing trace with hash 1168131629, now seen corresponding path program 1 times [2021-10-15 20:16:00,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:16:00,962 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755029118] [2021-10-15 20:16:00,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:16:00,962 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:16:00,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:01,134 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:16:01,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:01,140 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:01,140 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:16:01,140 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755029118] [2021-10-15 20:16:01,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [755029118] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:01,141 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1588052569] [2021-10-15 20:16:01,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:16:01,141 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:16:01,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:16:01,145 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:16:01,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-15 20:16:01,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:01,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 17 conjunts are in the unsatisfiable core [2021-10-15 20:16:01,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:16:01,449 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:01,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1588052569] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:01,450 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:16:01,450 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 15 [2021-10-15 20:16:01,450 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382785905] [2021-10-15 20:16:01,451 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-10-15 20:16:01,451 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:16:01,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-10-15 20:16:01,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-10-15 20:16:01,452 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 16 states, 15 states have (on average 2.4) internal successors, (36), 13 states have internal predecessors, (36), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:01,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:16:01,642 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2021-10-15 20:16:01,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-15 20:16:01,642 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.4) internal successors, (36), 13 states have internal predecessors, (36), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-10-15 20:16:01,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:16:01,643 INFO L225 Difference]: With dead ends: 45 [2021-10-15 20:16:01,643 INFO L226 Difference]: Without dead ends: 43 [2021-10-15 20:16:01,644 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 192.6ms TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2021-10-15 20:16:01,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-10-15 20:16:01,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2021-10-15 20:16:01,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 35 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:01,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-10-15 20:16:01,648 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 24 [2021-10-15 20:16:01,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:16:01,648 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-10-15 20:16:01,648 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.4) internal successors, (36), 13 states have internal predecessors, (36), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:01,648 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-10-15 20:16:01,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-10-15 20:16:01,649 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:16:01,650 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:16:01,688 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-10-15 20:16:01,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-10-15 20:16:01,865 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:16:01,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:16:01,866 INFO L82 PathProgramCache]: Analyzing trace with hash 1984823745, now seen corresponding path program 2 times [2021-10-15 20:16:01,866 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:16:01,866 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1695841611] [2021-10-15 20:16:01,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:16:01,866 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:16:01,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:02,128 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:16:02,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:02,137 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:02,137 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:16:02,137 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1695841611] [2021-10-15 20:16:02,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1695841611] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:02,137 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [214759128] [2021-10-15 20:16:02,137 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-15 20:16:02,138 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:16:02,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:16:02,139 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:16:02,164 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-10-15 20:16:02,272 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-15 20:16:02,273 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:16:02,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 26 conjunts are in the unsatisfiable core [2021-10-15 20:16:02,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:16:02,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-10-15 20:16:02,970 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-15 20:16:02,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 33 [2021-10-15 20:16:03,236 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:03,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [214759128] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:03,236 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:16:03,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 24 [2021-10-15 20:16:03,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97418860] [2021-10-15 20:16:03,237 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-10-15 20:16:03,237 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:16:03,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-10-15 20:16:03,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=496, Unknown=0, NotChecked=0, Total=552 [2021-10-15 20:16:03,239 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 21 states have internal predecessors, (49), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:04,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:16:04,660 INFO L93 Difference]: Finished difference Result 68 states and 71 transitions. [2021-10-15 20:16:04,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-10-15 20:16:04,661 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 21 states have internal predecessors, (49), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-10-15 20:16:04,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:16:04,661 INFO L225 Difference]: With dead ends: 68 [2021-10-15 20:16:04,661 INFO L226 Difference]: Without dead ends: 53 [2021-10-15 20:16:04,663 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 1291.0ms TimeCoverageRelationStatistics Valid=242, Invalid=1738, Unknown=0, NotChecked=0, Total=1980 [2021-10-15 20:16:04,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-10-15 20:16:04,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2021-10-15 20:16:04,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 45 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:04,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2021-10-15 20:16:04,665 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 30 [2021-10-15 20:16:04,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:16:04,666 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2021-10-15 20:16:04,666 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 21 states have internal predecessors, (49), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:04,666 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2021-10-15 20:16:04,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-10-15 20:16:04,667 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:16:04,667 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:16:04,706 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-10-15 20:16:04,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-10-15 20:16:04,877 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:16:04,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:16:04,878 INFO L82 PathProgramCache]: Analyzing trace with hash -77155368, now seen corresponding path program 3 times [2021-10-15 20:16:04,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:16:04,878 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [384647421] [2021-10-15 20:16:04,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:16:04,878 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:16:04,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:05,082 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:16:05,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:05,087 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 9 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:05,089 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:16:05,089 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [384647421] [2021-10-15 20:16:05,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [384647421] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:05,090 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [78403826] [2021-10-15 20:16:05,090 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-15 20:16:05,090 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:16:05,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:16:05,093 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:16:05,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-10-15 20:16:05,264 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-10-15 20:16:05,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:16:05,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 30 conjunts are in the unsatisfiable core [2021-10-15 20:16:05,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:16:05,440 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-10-15 20:16:05,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-10-15 20:16:05,744 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 9 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:05,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [78403826] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:05,744 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:16:05,745 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 23 [2021-10-15 20:16:05,745 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2781239] [2021-10-15 20:16:05,745 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-10-15 20:16:05,746 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:16:05,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-10-15 20:16:05,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=452, Unknown=0, NotChecked=0, Total=506 [2021-10-15 20:16:05,747 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand has 23 states, 23 states have (on average 2.4347826086956523) internal successors, (56), 20 states have internal predecessors, (56), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:06,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:16:06,287 INFO L93 Difference]: Finished difference Result 76 states and 78 transitions. [2021-10-15 20:16:06,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-15 20:16:06,288 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.4347826086956523) internal successors, (56), 20 states have internal predecessors, (56), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-10-15 20:16:06,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:16:06,289 INFO L225 Difference]: With dead ends: 76 [2021-10-15 20:16:06,289 INFO L226 Difference]: Without dead ends: 57 [2021-10-15 20:16:06,290 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 494.0ms TimeCoverageRelationStatistics Valid=129, Invalid=927, Unknown=0, NotChecked=0, Total=1056 [2021-10-15 20:16:06,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-10-15 20:16:06,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2021-10-15 20:16:06,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 49 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:06,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2021-10-15 20:16:06,292 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 40 [2021-10-15 20:16:06,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:16:06,292 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2021-10-15 20:16:06,293 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.4347826086956523) internal successors, (56), 20 states have internal predecessors, (56), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:06,293 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2021-10-15 20:16:06,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-10-15 20:16:06,294 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:16:06,294 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:16:06,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-10-15 20:16:06,517 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:16:06,517 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:16:06,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:16:06,517 INFO L82 PathProgramCache]: Analyzing trace with hash -488427557, now seen corresponding path program 4 times [2021-10-15 20:16:06,517 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:16:06,518 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [555563863] [2021-10-15 20:16:06,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:16:06,518 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:16:06,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:06,750 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:16:06,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:06,754 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:06,755 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:16:06,755 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [555563863] [2021-10-15 20:16:06,755 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [555563863] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:06,755 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568650312] [2021-10-15 20:16:06,755 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-15 20:16:06,755 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:16:06,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:16:06,757 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:16:06,765 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-10-15 20:16:06,945 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-15 20:16:06,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:16:06,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 36 conjunts are in the unsatisfiable core [2021-10-15 20:16:06,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:16:06,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-15 20:16:07,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-10-15 20:16:07,563 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-15 20:16:07,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-10-15 20:16:07,860 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 8 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:07,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [568650312] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:07,861 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:16:07,861 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 15] total 24 [2021-10-15 20:16:07,861 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625201821] [2021-10-15 20:16:07,862 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-10-15 20:16:07,862 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:16:07,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-10-15 20:16:07,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=542, Unknown=0, NotChecked=0, Total=600 [2021-10-15 20:16:07,863 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand has 25 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 22 states have internal predecessors, (73), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:08,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:16:08,649 INFO L93 Difference]: Finished difference Result 62 states and 65 transitions. [2021-10-15 20:16:08,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-10-15 20:16:08,650 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 22 states have internal predecessors, (73), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-10-15 20:16:08,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:16:08,651 INFO L225 Difference]: With dead ends: 62 [2021-10-15 20:16:08,651 INFO L226 Difference]: Without dead ends: 60 [2021-10-15 20:16:08,652 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 698.3ms TimeCoverageRelationStatistics Valid=133, Invalid=989, Unknown=0, NotChecked=0, Total=1122 [2021-10-15 20:16:08,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-10-15 20:16:08,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-10-15 20:16:08,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 55 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:08,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2021-10-15 20:16:08,654 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 44 [2021-10-15 20:16:08,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:16:08,655 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2021-10-15 20:16:08,655 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 22 states have internal predecessors, (73), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:08,655 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2021-10-15 20:16:08,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-10-15 20:16:08,656 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:16:08,656 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:16:08,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-10-15 20:16:08,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-10-15 20:16:08,865 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:16:08,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:16:08,865 INFO L82 PathProgramCache]: Analyzing trace with hash 444231919, now seen corresponding path program 5 times [2021-10-15 20:16:08,866 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:16:08,866 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712341965] [2021-10-15 20:16:08,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:16:08,866 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:16:08,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:09,127 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:16:09,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:09,132 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 13 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:09,132 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:16:09,133 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712341965] [2021-10-15 20:16:09,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1712341965] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:09,133 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241910855] [2021-10-15 20:16:09,133 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-10-15 20:16:09,133 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:16:09,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:16:09,137 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:16:09,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-10-15 20:16:09,392 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-10-15 20:16:09,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:16:09,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 36 conjunts are in the unsatisfiable core [2021-10-15 20:16:09,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:16:09,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-10-15 20:16:09,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-10-15 20:16:09,936 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 13 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:09,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241910855] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:09,937 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:16:09,937 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 26 [2021-10-15 20:16:09,937 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570382120] [2021-10-15 20:16:09,938 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-10-15 20:16:09,938 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:16:09,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-10-15 20:16:09,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=589, Unknown=0, NotChecked=0, Total=650 [2021-10-15 20:16:09,940 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand has 26 states, 26 states have (on average 2.6923076923076925) internal successors, (70), 23 states have internal predecessors, (70), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:10,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:16:10,583 INFO L93 Difference]: Finished difference Result 92 states and 94 transitions. [2021-10-15 20:16:10,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-10-15 20:16:10,584 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.6923076923076925) internal successors, (70), 23 states have internal predecessors, (70), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-10-15 20:16:10,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:16:10,585 INFO L225 Difference]: With dead ends: 92 [2021-10-15 20:16:10,585 INFO L226 Difference]: Without dead ends: 67 [2021-10-15 20:16:10,586 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 570.3ms TimeCoverageRelationStatistics Valid=143, Invalid=1189, Unknown=0, NotChecked=0, Total=1332 [2021-10-15 20:16:10,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-10-15 20:16:10,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2021-10-15 20:16:10,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 57 states have (on average 1.087719298245614) internal successors, (62), 59 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:10,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2021-10-15 20:16:10,589 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 50 [2021-10-15 20:16:10,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:16:10,589 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2021-10-15 20:16:10,589 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.6923076923076925) internal successors, (70), 23 states have internal predecessors, (70), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:10,590 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2021-10-15 20:16:10,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-10-15 20:16:10,590 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:16:10,591 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:16:10,617 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-10-15 20:16:10,806 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-10-15 20:16:10,806 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:16:10,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:16:10,806 INFO L82 PathProgramCache]: Analyzing trace with hash 1547306290, now seen corresponding path program 6 times [2021-10-15 20:16:10,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:16:10,806 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800051142] [2021-10-15 20:16:10,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:16:10,807 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:16:10,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:11,038 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:16:11,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:11,042 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 6 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:11,042 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:16:11,042 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800051142] [2021-10-15 20:16:11,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1800051142] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:11,042 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1367309970] [2021-10-15 20:16:11,043 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-10-15 20:16:11,043 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:16:11,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:16:11,044 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:16:11,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-10-15 20:16:11,300 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-10-15 20:16:11,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:16:11,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 31 conjunts are in the unsatisfiable core [2021-10-15 20:16:11,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:16:11,328 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-15 20:16:11,936 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 15 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:11,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1367309970] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:11,936 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:16:11,936 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 26 [2021-10-15 20:16:11,936 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979319701] [2021-10-15 20:16:11,937 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-10-15 20:16:11,937 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:16:11,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-10-15 20:16:11,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=616, Unknown=0, NotChecked=0, Total=702 [2021-10-15 20:16:11,938 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand has 27 states, 26 states have (on average 3.730769230769231) internal successors, (97), 24 states have internal predecessors, (97), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:12,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:16:12,493 INFO L93 Difference]: Finished difference Result 72 states and 75 transitions. [2021-10-15 20:16:12,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-10-15 20:16:12,494 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 3.730769230769231) internal successors, (97), 24 states have internal predecessors, (97), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-10-15 20:16:12,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:16:12,494 INFO L225 Difference]: With dead ends: 72 [2021-10-15 20:16:12,494 INFO L226 Difference]: Without dead ends: 70 [2021-10-15 20:16:12,495 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 538.4ms TimeCoverageRelationStatistics Valid=156, Invalid=966, Unknown=0, NotChecked=0, Total=1122 [2021-10-15 20:16:12,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-10-15 20:16:12,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-10-15 20:16:12,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 63 states have (on average 1.0793650793650793) internal successors, (68), 65 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:12,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2021-10-15 20:16:12,498 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 54 [2021-10-15 20:16:12,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:16:12,498 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2021-10-15 20:16:12,499 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 3.730769230769231) internal successors, (97), 24 states have internal predecessors, (97), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:12,499 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2021-10-15 20:16:12,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-10-15 20:16:12,499 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:16:12,499 INFO L512 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:16:12,538 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-10-15 20:16:12,707 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-10-15 20:16:12,708 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:16:12,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:16:12,708 INFO L82 PathProgramCache]: Analyzing trace with hash 1155246342, now seen corresponding path program 7 times [2021-10-15 20:16:12,708 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:16:12,708 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [380693827] [2021-10-15 20:16:12,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:16:12,709 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:16:12,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:13,005 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:16:13,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:13,010 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 17 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:13,010 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:16:13,010 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [380693827] [2021-10-15 20:16:13,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [380693827] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:13,010 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [574982918] [2021-10-15 20:16:13,010 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-10-15 20:16:13,010 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:16:13,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:16:13,013 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:16:13,029 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-10-15 20:16:13,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:13,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 42 conjunts are in the unsatisfiable core [2021-10-15 20:16:13,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:16:13,595 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-10-15 20:16:13,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-10-15 20:16:13,960 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 17 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:13,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [574982918] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:13,960 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:16:13,960 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 29 [2021-10-15 20:16:13,961 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825684736] [2021-10-15 20:16:13,961 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-10-15 20:16:13,961 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:16:13,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-10-15 20:16:13,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=744, Unknown=0, NotChecked=0, Total=812 [2021-10-15 20:16:13,963 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand has 29 states, 29 states have (on average 2.896551724137931) internal successors, (84), 26 states have internal predecessors, (84), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:14,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:16:14,831 INFO L93 Difference]: Finished difference Result 108 states and 110 transitions. [2021-10-15 20:16:14,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-10-15 20:16:14,832 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.896551724137931) internal successors, (84), 26 states have internal predecessors, (84), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 60 [2021-10-15 20:16:14,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:16:14,832 INFO L225 Difference]: With dead ends: 108 [2021-10-15 20:16:14,833 INFO L226 Difference]: Without dead ends: 77 [2021-10-15 20:16:14,833 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 707.2ms TimeCoverageRelationStatistics Valid=157, Invalid=1483, Unknown=0, NotChecked=0, Total=1640 [2021-10-15 20:16:14,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-10-15 20:16:14,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2021-10-15 20:16:14,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 67 states have (on average 1.0746268656716418) internal successors, (72), 69 states have internal predecessors, (72), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:14,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2021-10-15 20:16:14,836 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 60 [2021-10-15 20:16:14,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:16:14,837 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2021-10-15 20:16:14,837 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.896551724137931) internal successors, (84), 26 states have internal predecessors, (84), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:14,837 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2021-10-15 20:16:14,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-10-15 20:16:14,838 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:16:14,838 INFO L512 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:16:14,874 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-10-15 20:16:15,038 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:16:15,038 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:16:15,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:16:15,039 INFO L82 PathProgramCache]: Analyzing trace with hash -754121335, now seen corresponding path program 8 times [2021-10-15 20:16:15,039 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:16:15,039 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656053467] [2021-10-15 20:16:15,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:16:15,039 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:16:15,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:15,303 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:16:15,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:15,307 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 15 proven. 95 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:15,317 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:16:15,317 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656053467] [2021-10-15 20:16:15,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1656053467] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:15,317 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1530154424] [2021-10-15 20:16:15,317 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-15 20:16:15,318 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:16:15,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:16:15,320 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:16:15,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-10-15 20:16:15,606 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-15 20:16:15,606 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:16:15,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 37 conjunts are in the unsatisfiable core [2021-10-15 20:16:15,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:16:16,074 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 28 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:16,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1530154424] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:16,077 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:16:16,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 26 [2021-10-15 20:16:16,078 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313336699] [2021-10-15 20:16:16,080 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-10-15 20:16:16,080 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:16:16,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-10-15 20:16:16,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=612, Unknown=0, NotChecked=0, Total=702 [2021-10-15 20:16:16,082 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand has 27 states, 26 states have (on average 3.5384615384615383) internal successors, (92), 24 states have internal predecessors, (92), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:16,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:16:16,615 INFO L93 Difference]: Finished difference Result 82 states and 85 transitions. [2021-10-15 20:16:16,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-15 20:16:16,616 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 3.5384615384615383) internal successors, (92), 24 states have internal predecessors, (92), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 64 [2021-10-15 20:16:16,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:16:16,617 INFO L225 Difference]: With dead ends: 82 [2021-10-15 20:16:16,617 INFO L226 Difference]: Without dead ends: 80 [2021-10-15 20:16:16,617 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 442.0ms TimeCoverageRelationStatistics Valid=154, Invalid=1036, Unknown=0, NotChecked=0, Total=1190 [2021-10-15 20:16:16,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-10-15 20:16:16,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2021-10-15 20:16:16,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 73 states have (on average 1.0684931506849316) internal successors, (78), 75 states have internal predecessors, (78), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:16,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2021-10-15 20:16:16,620 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 64 [2021-10-15 20:16:16,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:16:16,621 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2021-10-15 20:16:16,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 3.5384615384615383) internal successors, (92), 24 states have internal predecessors, (92), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:16,621 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2021-10-15 20:16:16,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-10-15 20:16:16,622 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:16:16,622 INFO L512 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:16:16,647 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-10-15 20:16:16,829 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:16:16,829 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:16:16,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:16:16,829 INFO L82 PathProgramCache]: Analyzing trace with hash 195873821, now seen corresponding path program 9 times [2021-10-15 20:16:16,829 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:16:16,830 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961932191] [2021-10-15 20:16:16,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:16:16,830 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:16:16,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:17,187 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:16:17,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:17,191 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:17,191 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:16:17,191 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961932191] [2021-10-15 20:16:17,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [961932191] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:17,191 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831356560] [2021-10-15 20:16:17,191 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-15 20:16:17,191 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:16:17,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:16:17,192 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:16:17,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-10-15 20:16:17,521 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-10-15 20:16:17,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:16:17,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 41 conjunts are in the unsatisfiable core [2021-10-15 20:16:17,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:16:17,784 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-10-15 20:16:25,320 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-15 20:16:25,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 33 [2021-10-15 20:16:25,584 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 28 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:25,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [831356560] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:25,585 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:16:25,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 40 [2021-10-15 20:16:25,586 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915840391] [2021-10-15 20:16:25,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-10-15 20:16:25,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:16:25,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-10-15 20:16:25,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1419, Unknown=1, NotChecked=0, Total=1560 [2021-10-15 20:16:25,588 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand has 40 states, 40 states have (on average 3.225) internal successors, (129), 37 states have internal predecessors, (129), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:58,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:16:58,580 INFO L93 Difference]: Finished difference Result 132 states and 135 transitions. [2021-10-15 20:16:58,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-10-15 20:16:58,581 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 3.225) internal successors, (129), 37 states have internal predecessors, (129), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 70 [2021-10-15 20:16:58,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:16:58,582 INFO L225 Difference]: With dead ends: 132 [2021-10-15 20:16:58,582 INFO L226 Difference]: Without dead ends: 93 [2021-10-15 20:16:58,584 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 708 ImplicationChecksByTransitivity, 35538.2ms TimeCoverageRelationStatistics Valid=553, Invalid=4129, Unknown=10, NotChecked=0, Total=4692 [2021-10-15 20:16:58,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-10-15 20:16:58,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2021-10-15 20:16:58,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 83 states have (on average 1.0602409638554218) internal successors, (88), 85 states have internal predecessors, (88), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:58,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2021-10-15 20:16:58,588 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 70 [2021-10-15 20:16:58,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:16:58,588 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2021-10-15 20:16:58,588 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 3.225) internal successors, (129), 37 states have internal predecessors, (129), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:16:58,589 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2021-10-15 20:16:58,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-10-15 20:16:58,589 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:16:58,590 INFO L512 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:16:58,616 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-10-15 20:16:58,813 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-10-15 20:16:58,813 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:16:58,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:16:58,813 INFO L82 PathProgramCache]: Analyzing trace with hash 383797812, now seen corresponding path program 10 times [2021-10-15 20:16:58,813 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:16:58,814 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1143512747] [2021-10-15 20:16:58,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:16:58,814 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:16:58,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:59,230 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:16:59,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:16:59,244 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 25 proven. 174 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:16:59,244 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:16:59,245 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1143512747] [2021-10-15 20:16:59,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1143512747] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:16:59,245 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [626881429] [2021-10-15 20:16:59,245 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-15 20:16:59,245 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:16:59,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:16:59,265 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:16:59,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-10-15 20:16:59,765 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-15 20:16:59,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:16:59,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 44 conjunts are in the unsatisfiable core [2021-10-15 20:16:59,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:16:59,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-15 20:17:00,327 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-10-15 20:17:01,099 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-10-15 20:17:01,099 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 25 [2021-10-15 20:17:01,116 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 121 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:17:01,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [626881429] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:17:01,116 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:17:01,116 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 41 [2021-10-15 20:17:01,118 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496525217] [2021-10-15 20:17:01,119 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-10-15 20:17:01,119 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:17:01,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-10-15 20:17:01,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1511, Unknown=0, NotChecked=0, Total=1640 [2021-10-15 20:17:01,120 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand has 41 states, 41 states have (on average 3.4878048780487805) internal successors, (143), 38 states have internal predecessors, (143), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:17:02,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:17:02,763 INFO L93 Difference]: Finished difference Result 140 states and 142 transitions. [2021-10-15 20:17:02,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-10-15 20:17:02,765 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.4878048780487805) internal successors, (143), 38 states have internal predecessors, (143), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2021-10-15 20:17:02,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:17:02,766 INFO L225 Difference]: With dead ends: 140 [2021-10-15 20:17:02,766 INFO L226 Difference]: Without dead ends: 97 [2021-10-15 20:17:02,767 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 390 ImplicationChecksByTransitivity, 1567.4ms TimeCoverageRelationStatistics Valid=334, Invalid=3448, Unknown=0, NotChecked=0, Total=3782 [2021-10-15 20:17:02,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-10-15 20:17:02,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 94. [2021-10-15 20:17:02,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 87 states have (on average 1.0574712643678161) internal successors, (92), 89 states have internal predecessors, (92), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:17:02,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2021-10-15 20:17:02,770 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 80 [2021-10-15 20:17:02,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:17:02,770 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2021-10-15 20:17:02,771 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 3.4878048780487805) internal successors, (143), 38 states have internal predecessors, (143), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:17:02,771 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2021-10-15 20:17:02,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-10-15 20:17:02,772 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:17:02,772 INFO L512 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:17:02,793 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-10-15 20:17:02,972 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-10-15 20:17:02,972 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:17:02,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:17:02,973 INFO L82 PathProgramCache]: Analyzing trace with hash 219236151, now seen corresponding path program 11 times [2021-10-15 20:17:02,973 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:17:02,973 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1946852535] [2021-10-15 20:17:02,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:17:02,973 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:17:02,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:17:03,365 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:17:03,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:17:03,372 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 45 proven. 179 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:17:03,372 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:17:03,372 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1946852535] [2021-10-15 20:17:03,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1946852535] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:17:03,373 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888174384] [2021-10-15 20:17:03,373 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-10-15 20:17:03,373 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:17:03,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:17:03,374 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:17:03,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-10-15 20:17:03,819 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-10-15 20:17:03,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:17:03,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 52 conjunts are in the unsatisfiable core [2021-10-15 20:17:03,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:17:03,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-15 20:17:04,590 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 66 proven. 158 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:17:04,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1888174384] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:17:04,590 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:17:04,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18] total 28 [2021-10-15 20:17:04,591 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846090764] [2021-10-15 20:17:04,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-10-15 20:17:04,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:17:04,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-10-15 20:17:04,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=727, Unknown=0, NotChecked=0, Total=812 [2021-10-15 20:17:04,593 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand has 29 states, 28 states have (on average 4.642857142857143) internal successors, (130), 27 states have internal predecessors, (130), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:17:05,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:17:05,476 INFO L93 Difference]: Finished difference Result 102 states and 105 transitions. [2021-10-15 20:17:05,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-10-15 20:17:05,476 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 4.642857142857143) internal successors, (130), 27 states have internal predecessors, (130), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 84 [2021-10-15 20:17:05,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:17:05,477 INFO L225 Difference]: With dead ends: 102 [2021-10-15 20:17:05,477 INFO L226 Difference]: Without dead ends: 100 [2021-10-15 20:17:05,478 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 608.4ms TimeCoverageRelationStatistics Valid=155, Invalid=1327, Unknown=0, NotChecked=0, Total=1482 [2021-10-15 20:17:05,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-10-15 20:17:05,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-10-15 20:17:05,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 93 states have (on average 1.053763440860215) internal successors, (98), 95 states have internal predecessors, (98), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:17:05,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 102 transitions. [2021-10-15 20:17:05,481 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 102 transitions. Word has length 84 [2021-10-15 20:17:05,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:17:05,482 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 102 transitions. [2021-10-15 20:17:05,482 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 4.642857142857143) internal successors, (130), 27 states have internal predecessors, (130), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:17:05,482 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 102 transitions. [2021-10-15 20:17:05,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-10-15 20:17:05,483 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:17:05,484 INFO L512 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:17:05,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-10-15 20:17:05,701 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:17:05,701 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:17:05,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:17:05,701 INFO L82 PathProgramCache]: Analyzing trace with hash 473469771, now seen corresponding path program 12 times [2021-10-15 20:17:05,701 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:17:05,702 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341466594] [2021-10-15 20:17:05,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:17:05,702 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:17:05,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:17:06,142 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:17:06,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:17:06,155 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 29 proven. 238 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:17:06,155 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:17:06,155 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341466594] [2021-10-15 20:17:06,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [341466594] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:17:06,155 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1340940665] [2021-10-15 20:17:06,156 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-10-15 20:17:06,156 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:17:06,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:17:06,166 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:17:06,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-10-15 20:17:06,707 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-10-15 20:17:06,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:17:06,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 58 conjunts are in the unsatisfiable core [2021-10-15 20:17:06,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:17:07,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-10-15 20:17:07,556 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-10-15 20:17:07,575 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 29 proven. 238 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:17:07,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1340940665] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:17:07,575 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:17:07,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 38 [2021-10-15 20:17:07,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795843301] [2021-10-15 20:17:07,576 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-10-15 20:17:07,576 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:17:07,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-10-15 20:17:07,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1317, Unknown=0, NotChecked=0, Total=1406 [2021-10-15 20:17:07,577 INFO L87 Difference]: Start difference. First operand 100 states and 102 transitions. Second operand has 38 states, 38 states have (on average 3.3157894736842106) internal successors, (126), 35 states have internal predecessors, (126), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:17:09,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:17:09,234 INFO L93 Difference]: Finished difference Result 156 states and 158 transitions. [2021-10-15 20:17:09,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-10-15 20:17:09,235 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.3157894736842106) internal successors, (126), 35 states have internal predecessors, (126), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 90 [2021-10-15 20:17:09,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:17:09,235 INFO L225 Difference]: With dead ends: 156 [2021-10-15 20:17:09,236 INFO L226 Difference]: Without dead ends: 107 [2021-10-15 20:17:09,236 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 1153.3ms TimeCoverageRelationStatistics Valid=199, Invalid=2557, Unknown=0, NotChecked=0, Total=2756 [2021-10-15 20:17:09,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-10-15 20:17:09,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 104. [2021-10-15 20:17:09,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 97 states have (on average 1.0515463917525774) internal successors, (102), 99 states have internal predecessors, (102), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:17:09,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 106 transitions. [2021-10-15 20:17:09,240 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 106 transitions. Word has length 90 [2021-10-15 20:17:09,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:17:09,240 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 106 transitions. [2021-10-15 20:17:09,240 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.3157894736842106) internal successors, (126), 35 states have internal predecessors, (126), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:17:09,241 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 106 transitions. [2021-10-15 20:17:09,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-10-15 20:17:09,241 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:17:09,242 INFO L512 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:17:09,267 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-10-15 20:17:09,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:17:09,449 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:17:09,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:17:09,449 INFO L82 PathProgramCache]: Analyzing trace with hash -641767282, now seen corresponding path program 13 times [2021-10-15 20:17:09,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:17:09,449 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [698926343] [2021-10-15 20:17:09,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:17:09,450 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:17:09,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:17:09,948 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:17:09,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:17:09,952 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 66 proven. 230 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:17:09,952 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:17:09,953 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [698926343] [2021-10-15 20:17:09,953 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [698926343] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:17:09,953 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1294410295] [2021-10-15 20:17:09,953 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-10-15 20:17:09,953 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:17:09,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:17:09,957 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:17:09,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-10-15 20:17:10,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:17:10,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 52 conjunts are in the unsatisfiable core [2021-10-15 20:17:10,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:17:11,481 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 91 proven. 205 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:17:11,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1294410295] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:17:11,481 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:17:11,481 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 35 [2021-10-15 20:17:11,481 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51976879] [2021-10-15 20:17:11,482 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-10-15 20:17:11,482 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:17:11,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-10-15 20:17:11,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1098, Unknown=0, NotChecked=0, Total=1260 [2021-10-15 20:17:11,483 INFO L87 Difference]: Start difference. First operand 104 states and 106 transitions. Second operand has 36 states, 35 states have (on average 3.8285714285714287) internal successors, (134), 33 states have internal predecessors, (134), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:17:12,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:17:12,637 INFO L93 Difference]: Finished difference Result 112 states and 115 transitions. [2021-10-15 20:17:12,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-10-15 20:17:12,637 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 3.8285714285714287) internal successors, (134), 33 states have internal predecessors, (134), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 94 [2021-10-15 20:17:12,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:17:12,638 INFO L225 Difference]: With dead ends: 112 [2021-10-15 20:17:12,638 INFO L226 Difference]: Without dead ends: 110 [2021-10-15 20:17:12,639 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 816.3ms TimeCoverageRelationStatistics Valid=253, Invalid=1909, Unknown=0, NotChecked=0, Total=2162 [2021-10-15 20:17:12,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-10-15 20:17:12,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2021-10-15 20:17:12,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 103 states have (on average 1.0485436893203883) internal successors, (108), 105 states have internal predecessors, (108), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:17:12,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 112 transitions. [2021-10-15 20:17:12,642 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 112 transitions. Word has length 94 [2021-10-15 20:17:12,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:17:12,642 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 112 transitions. [2021-10-15 20:17:12,643 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 3.8285714285714287) internal successors, (134), 33 states have internal predecessors, (134), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:17:12,643 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 112 transitions. [2021-10-15 20:17:12,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-10-15 20:17:12,644 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:17:12,644 INFO L512 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:17:12,681 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-10-15 20:17:12,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-10-15 20:17:12,865 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:17:12,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:17:12,865 INFO L82 PathProgramCache]: Analyzing trace with hash -699918494, now seen corresponding path program 14 times [2021-10-15 20:17:12,865 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:17:12,865 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94494017] [2021-10-15 20:17:12,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:17:12,866 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:17:12,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:17:13,519 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:17:13,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:17:13,523 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 33 proven. 312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:17:13,523 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:17:13,524 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94494017] [2021-10-15 20:17:13,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [94494017] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:17:13,524 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1818151240] [2021-10-15 20:17:13,524 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-15 20:17:13,524 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:17:13,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:17:13,525 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:17:13,546 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-10-15 20:17:14,228 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-15 20:17:14,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:17:14,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 61 conjunts are in the unsatisfiable core [2021-10-15 20:17:14,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:17:14,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-10-15 20:17:17,141 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-15 20:17:17,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 33 [2021-10-15 20:17:17,462 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 91 proven. 254 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:17:17,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1818151240] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:17:17,462 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:17:17,462 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 52 [2021-10-15 20:17:17,463 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127300804] [2021-10-15 20:17:17,463 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-10-15 20:17:17,463 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:17:17,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-10-15 20:17:17,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=2480, Unknown=0, NotChecked=0, Total=2652 [2021-10-15 20:17:17,465 INFO L87 Difference]: Start difference. First operand 110 states and 112 transitions. Second operand has 52 states, 52 states have (on average 3.6346153846153846) internal successors, (189), 49 states have internal predecessors, (189), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:17:26,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:17:26,266 INFO L93 Difference]: Finished difference Result 180 states and 183 transitions. [2021-10-15 20:17:26,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-10-15 20:17:26,266 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 3.6346153846153846) internal successors, (189), 49 states have internal predecessors, (189), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 100 [2021-10-15 20:17:26,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:17:26,267 INFO L225 Difference]: With dead ends: 180 [2021-10-15 20:17:26,267 INFO L226 Difference]: Without dead ends: 123 [2021-10-15 20:17:26,269 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1177 ImplicationChecksByTransitivity, 5238.4ms TimeCoverageRelationStatistics Valid=508, Invalid=6974, Unknown=0, NotChecked=0, Total=7482 [2021-10-15 20:17:26,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-10-15 20:17:26,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 120. [2021-10-15 20:17:26,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 113 states have (on average 1.0442477876106195) internal successors, (118), 115 states have internal predecessors, (118), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:17:26,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 122 transitions. [2021-10-15 20:17:26,273 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 122 transitions. Word has length 100 [2021-10-15 20:17:26,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:17:26,273 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 122 transitions. [2021-10-15 20:17:26,273 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 3.6346153846153846) internal successors, (189), 49 states have internal predecessors, (189), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:17:26,273 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 122 transitions. [2021-10-15 20:17:26,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-10-15 20:17:26,274 INFO L504 BasicCegarLoop]: Found error trace [2021-10-15 20:17:26,274 INFO L512 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-15 20:17:26,299 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-10-15 20:17:26,481 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-10-15 20:17:26,481 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-15 20:17:26,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-15 20:17:26,481 INFO L82 PathProgramCache]: Analyzing trace with hash -76462471, now seen corresponding path program 15 times [2021-10-15 20:17:26,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-15 20:17:26,482 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [88294390] [2021-10-15 20:17:26,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-15 20:17:26,482 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-15 20:17:26,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:17:27,109 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-15 20:17:27,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-15 20:17:27,123 INFO L134 CoverageAnalysis]: Checked inductivity of 433 backedges. 37 proven. 396 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-15 20:17:27,123 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-15 20:17:27,123 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [88294390] [2021-10-15 20:17:27,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [88294390] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:17:27,123 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [420174032] [2021-10-15 20:17:27,124 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-15 20:17:27,124 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-15 20:17:27,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 [2021-10-15 20:17:27,141 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-15 20:17:27,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-10-15 20:17:27,955 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-10-15 20:17:27,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-15 20:17:27,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 40 conjunts are in the unsatisfiable core [2021-10-15 20:17:27,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-15 20:17:27,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-15 20:17:28,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-10-15 20:17:29,100 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-15 20:17:29,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 26 [2021-10-15 20:17:29,395 INFO L134 CoverageAnalysis]: Checked inductivity of 433 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2021-10-15 20:17:29,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [420174032] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-15 20:17:29,395 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-15 20:17:29,395 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 10] total 38 [2021-10-15 20:17:29,396 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574747489] [2021-10-15 20:17:29,396 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-10-15 20:17:29,396 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-15 20:17:29,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-10-15 20:17:29,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1325, Unknown=0, NotChecked=0, Total=1406 [2021-10-15 20:17:29,397 INFO L87 Difference]: Start difference. First operand 120 states and 122 transitions. Second operand has 38 states, 38 states have (on average 3.3947368421052633) internal successors, (129), 35 states have internal predecessors, (129), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:17:34,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-15 20:17:34,867 INFO L93 Difference]: Finished difference Result 186 states and 187 transitions. [2021-10-15 20:17:34,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-10-15 20:17:34,868 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.3947368421052633) internal successors, (129), 35 states have internal predecessors, (129), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 110 [2021-10-15 20:17:34,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-15 20:17:34,868 INFO L225 Difference]: With dead ends: 186 [2021-10-15 20:17:34,868 INFO L226 Difference]: Without dead ends: 0 [2021-10-15 20:17:34,871 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1974 ImplicationChecksByTransitivity, 4724.1ms TimeCoverageRelationStatistics Valid=1001, Invalid=9711, Unknown=0, NotChecked=0, Total=10712 [2021-10-15 20:17:34,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-10-15 20:17:34,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-10-15 20:17:34,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-15 20:17:34,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-10-15 20:17:34,871 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 110 [2021-10-15 20:17:34,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-15 20:17:34,872 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-10-15 20:17:34,872 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.3947368421052633) internal successors, (129), 35 states have internal predecessors, (129), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-15 20:17:34,872 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-10-15 20:17:34,872 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-10-15 20:17:34,874 INFO L764 garLoopResultBuilder]: Registering result SAFE for location cstrchrErr0REQUIRES_VIOLATION [2021-10-15 20:17:34,874 INFO L764 garLoopResultBuilder]: Registering result SAFE for location cstrchrErr1REQUIRES_VIOLATION [2021-10-15 20:17:34,875 INFO L764 garLoopResultBuilder]: Registering result SAFE for location cstrchrErr2REQUIRES_VIOLATION [2021-10-15 20:17:34,875 INFO L764 garLoopResultBuilder]: Registering result SAFE for location cstrchrErr3REQUIRES_VIOLATION [2021-10-15 20:17:34,875 INFO L764 garLoopResultBuilder]: Registering result SAFE for location cstrchrErr4REQUIRES_VIOLATION [2021-10-15 20:17:34,875 INFO L764 garLoopResultBuilder]: Registering result SAFE for location cstrchrErr5REQUIRES_VIOLATION [2021-10-15 20:17:34,875 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr0REQUIRES_VIOLATION [2021-10-15 20:17:34,875 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr1REQUIRES_VIOLATION [2021-10-15 20:17:34,875 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr2REQUIRES_VIOLATION [2021-10-15 20:17:34,876 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr3REQUIRES_VIOLATION [2021-10-15 20:17:34,876 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr4ENSURES_VIOLATIONMEMORY_LEAK [2021-10-15 20:17:34,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-10-15 20:17:35,076 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-10-15 20:17:35,081 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-15 20:17:35,083 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 15.10 08:17:35 BoogieIcfgContainer [2021-10-15 20:17:35,083 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-15 20:17:35,084 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-15 20:17:35,084 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-15 20:17:35,084 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-15 20:17:35,085 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 08:15:56" (3/4) ... [2021-10-15 20:17:35,088 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-10-15 20:17:35,095 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure cstrchr [2021-10-15 20:17:35,095 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2021-10-15 20:17:35,095 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_32 [2021-10-15 20:17:35,096 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_64 [2021-10-15 20:17:35,096 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint16_identity [2021-10-15 20:17:35,096 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint64_identity [2021-10-15 20:17:35,096 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2021-10-15 20:17:35,096 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint32_identity [2021-10-15 20:17:35,103 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 14 nodes and edges [2021-10-15 20:17:35,103 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2021-10-15 20:17:35,103 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-15 20:17:35,103 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-15 20:17:35,137 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/witness.graphml [2021-10-15 20:17:35,137 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-15 20:17:35,138 INFO L168 Benchmark]: Toolchain (without parser) took 99366.30 ms. Allocated memory was 109.1 MB in the beginning and 232.8 MB in the end (delta: 123.7 MB). Free memory was 67.2 MB in the beginning and 103.9 MB in the end (delta: -36.7 MB). Peak memory consumption was 87.0 MB. Max. memory is 16.1 GB. [2021-10-15 20:17:35,139 INFO L168 Benchmark]: CDTParser took 0.32 ms. Allocated memory is still 109.1 MB. Free memory is still 84.6 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-15 20:17:35,139 INFO L168 Benchmark]: CACSL2BoogieTranslator took 433.63 ms. Allocated memory is still 109.1 MB. Free memory was 67.0 MB in the beginning and 78.1 MB in the end (delta: -11.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-15 20:17:35,140 INFO L168 Benchmark]: Boogie Preprocessor took 97.69 ms. Allocated memory is still 109.1 MB. Free memory was 78.1 MB in the beginning and 76.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-15 20:17:35,140 INFO L168 Benchmark]: RCFGBuilder took 521.05 ms. Allocated memory is still 109.1 MB. Free memory was 76.0 MB in the beginning and 57.0 MB in the end (delta: 18.9 MB). Peak memory consumption was 18.9 MB. Max. memory is 16.1 GB. [2021-10-15 20:17:35,141 INFO L168 Benchmark]: TraceAbstraction took 98254.21 ms. Allocated memory was 109.1 MB in the beginning and 232.8 MB in the end (delta: 123.7 MB). Free memory was 56.7 MB in the beginning and 106.8 MB in the end (delta: -50.2 MB). Peak memory consumption was 76.5 MB. Max. memory is 16.1 GB. [2021-10-15 20:17:35,141 INFO L168 Benchmark]: Witness Printer took 53.70 ms. Allocated memory is still 232.8 MB. Free memory was 106.8 MB in the beginning and 103.9 MB in the end (delta: 2.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-15 20:17:35,143 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32 ms. Allocated memory is still 109.1 MB. Free memory is still 84.6 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 433.63 ms. Allocated memory is still 109.1 MB. Free memory was 67.0 MB in the beginning and 78.1 MB in the end (delta: -11.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 97.69 ms. Allocated memory is still 109.1 MB. Free memory was 78.1 MB in the beginning and 76.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 521.05 ms. Allocated memory is still 109.1 MB. Free memory was 76.0 MB in the beginning and 57.0 MB in the end (delta: 18.9 MB). Peak memory consumption was 18.9 MB. Max. memory is 16.1 GB. * TraceAbstraction took 98254.21 ms. Allocated memory was 109.1 MB in the beginning and 232.8 MB in the end (delta: 123.7 MB). Free memory was 56.7 MB in the beginning and 106.8 MB in the end (delta: -50.2 MB). Peak memory consumption was 76.5 MB. Max. memory is 16.1 GB. * Witness Printer took 53.70 ms. Allocated memory is still 232.8 MB. Free memory was 106.8 MB in the beginning and 103.9 MB in the end (delta: 2.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 516]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 516]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 516]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 516]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 518]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 518]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 529]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 529]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 532]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 532]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 520]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 9 procedures, 58 locations, 11 error locations. Started 1 CEGAR loops. OverallTime: 98188.1ms, OverallIterations: 27, TraceHistogramMax: 10, EmptinessCheckTime: 45.5ms, AutomataDifference: 59793.5ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 16.1ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 793 SDtfs, 2952 SDslu, 3569 SDs, 0 SdLazy, 20857 SolverSat, 510 SolverUnsat, 2 SolverUnknown, 0 SolverNotchecked, 16453.6ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1665 GetRequests, 871 SyntacticMatches, 9 SemanticMatches, 785 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6686 ImplicationChecksByTransitivity, 55236.4ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=120occurred in iteration=26, InterpolantAutomatonStates: 450, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 162.3ms AutomataMinimizationTime, 27 MinimizatonAttempts, 77 StatesRemovedByMinimization, 15 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 205.5ms SsaConstructionTime, 1146.8ms SatisfiabilityAnalysisTime, 27681.7ms InterpolantComputationTime, 2176 NumberOfCodeBlocks, 2153 NumberOfCodeBlocksAsserted, 88 NumberOfCheckSat, 2133 ConstructedInterpolants, 190 QuantifiedInterpolants, 20131 SizeOfPredicates, 117 NumberOfNonLiveVariables, 3506 ConjunctsInSsa, 614 ConjunctsInUnsatCore, 43 InterpolantComputations, 11 PerfectInterpolantSequences, 1220/4617 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 11 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2021-10-15 20:17:35,196 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9046e79a-31a5-44d1-8629-62acd34bbb86/bin/uautomizer-hJ6jxDFKc3/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...