./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 b2eff8ba Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrchr-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD --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 71679b2a85162a2bf4315b62ab1893b5cfd06e20fc9e264973bd31bc9d08e300 ..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-b2eff8b [2021-10-28 23:47:45,329 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-28 23:47:45,332 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-28 23:47:45,409 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-28 23:47:45,410 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-28 23:47:45,415 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-28 23:47:45,417 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-28 23:47:45,422 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-28 23:47:45,425 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-28 23:47:45,433 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-28 23:47:45,435 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-28 23:47:45,437 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-28 23:47:45,438 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-28 23:47:45,441 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-28 23:47:45,443 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-28 23:47:45,450 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-28 23:47:45,452 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-28 23:47:45,453 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-28 23:47:45,456 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-28 23:47:45,466 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-28 23:47:45,468 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-28 23:47:45,470 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-28 23:47:45,474 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-28 23:47:45,475 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-28 23:47:45,479 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-28 23:47:45,480 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-28 23:47:45,481 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-28 23:47:45,483 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-28 23:47:45,484 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-28 23:47:45,486 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-28 23:47:45,486 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-28 23:47:45,487 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-28 23:47:45,490 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-28 23:47:45,491 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-28 23:47:45,494 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-28 23:47:45,495 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-28 23:47:45,496 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-28 23:47:45,496 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-28 23:47:45,496 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-28 23:47:45,498 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-28 23:47:45,499 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-28 23:47:45,500 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-10-28 23:47:45,553 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-28 23:47:45,554 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-28 23:47:45,554 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-10-28 23:47:45,555 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-10-28 23:47:45,564 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-28 23:47:45,565 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-28 23:47:45,565 INFO L138 SettingsManager]: * Use SBE=true [2021-10-28 23:47:45,565 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-28 23:47:45,566 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-28 23:47:45,566 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-10-28 23:47:45,567 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-28 23:47:45,568 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-28 23:47:45,568 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-28 23:47:45,568 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-10-28 23:47:45,569 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-10-28 23:47:45,569 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-10-28 23:47:45,569 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-28 23:47:45,569 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-28 23:47:45,570 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-28 23:47:45,570 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-28 23:47:45,570 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-28 23:47:45,571 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-28 23:47:45,571 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-28 23:47:45,571 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-28 23:47:45,572 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-28 23:47:45,572 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-28 23:47:45,572 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-10-28 23:47:45,572 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-28 23:47:45,573 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-28 23:47:45,573 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_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 71679b2a85162a2bf4315b62ab1893b5cfd06e20fc9e264973bd31bc9d08e300 [2021-10-28 23:47:45,855 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-28 23:47:45,878 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-28 23:47:45,881 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-28 23:47:45,882 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-28 23:47:45,884 INFO L275 PluginConnector]: CDTParser initialized [2021-10-28 23:47:45,885 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/../../sv-benchmarks/c/array-memsafety/cstrchr-alloca-2.i [2021-10-28 23:47:45,973 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/data/39a20feaa/9245ebf409c745928204a6c78ce12a39/FLAGbdc45a7ac [2021-10-28 23:47:46,538 INFO L306 CDTParser]: Found 1 translation units. [2021-10-28 23:47:46,539 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/sv-benchmarks/c/array-memsafety/cstrchr-alloca-2.i [2021-10-28 23:47:46,565 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/data/39a20feaa/9245ebf409c745928204a6c78ce12a39/FLAGbdc45a7ac [2021-10-28 23:47:46,809 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/data/39a20feaa/9245ebf409c745928204a6c78ce12a39 [2021-10-28 23:47:46,812 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-28 23:47:46,814 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-10-28 23:47:46,819 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-28 23:47:46,819 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-28 23:47:46,823 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-28 23:47:46,824 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.10 11:47:46" (1/1) ... [2021-10-28 23:47:46,826 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c0aa53f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 11:47:46, skipping insertion in model container [2021-10-28 23:47:46,827 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.10 11:47:46" (1/1) ... [2021-10-28 23:47:46,834 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-28 23:47:46,884 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-28 23:47:47,279 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-28 23:47:47,294 INFO L203 MainTranslator]: Completed pre-run [2021-10-28 23:47:47,350 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-28 23:47:47,390 INFO L208 MainTranslator]: Completed translation [2021-10-28 23:47:47,392 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 11:47:47 WrapperNode [2021-10-28 23:47:47,392 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-28 23:47:47,394 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-28 23:47:47,394 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-28 23:47:47,394 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-28 23:47:47,406 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 11:47:47" (1/1) ... [2021-10-28 23:47:47,407 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 11:47:47" (1/1) ... [2021-10-28 23:47:47,423 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 11:47:47" (1/1) ... [2021-10-28 23:47:47,424 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 11:47:47" (1/1) ... [2021-10-28 23:47:47,438 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 11:47:47" (1/1) ... [2021-10-28 23:47:47,443 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 11:47:47" (1/1) ... [2021-10-28 23:47:47,447 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 11:47:47" (1/1) ... [2021-10-28 23:47:47,453 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-28 23:47:47,466 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-28 23:47:47,466 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-28 23:47:47,466 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-28 23:47:47,467 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 11:47:47" (1/1) ... [2021-10-28 23:47:47,486 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-28 23:47:47,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 [2021-10-28 23:47:47,520 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-28 23:47:47,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-28 23:47:47,569 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-10-28 23:47:47,570 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-28 23:47:47,570 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-10-28 23:47:47,571 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-10-28 23:47:47,571 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2021-10-28 23:47:47,571 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2021-10-28 23:47:47,571 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2021-10-28 23:47:47,572 INFO L138 BoogieDeclarations]: Found implementation of procedure cstrchr [2021-10-28 23:47:47,573 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-10-28 23:47:47,573 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-10-28 23:47:47,573 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-10-28 23:47:47,574 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-10-28 23:47:47,574 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-10-28 23:47:47,575 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-10-28 23:47:47,575 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-10-28 23:47:47,575 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-10-28 23:47:47,575 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-10-28 23:47:47,575 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-10-28 23:47:47,576 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-10-28 23:47:47,576 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-10-28 23:47:47,576 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-10-28 23:47:47,576 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-10-28 23:47:47,576 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-10-28 23:47:47,577 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-10-28 23:47:47,577 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-10-28 23:47:47,577 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-10-28 23:47:47,577 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-10-28 23:47:47,577 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2021-10-28 23:47:47,578 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2021-10-28 23:47:47,578 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2021-10-28 23:47:47,578 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-10-28 23:47:47,578 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-10-28 23:47:47,579 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-10-28 23:47:47,579 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-10-28 23:47:47,579 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-10-28 23:47:47,579 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-10-28 23:47:47,579 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-10-28 23:47:47,580 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-10-28 23:47:47,580 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-10-28 23:47:47,580 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-10-28 23:47:47,580 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-10-28 23:47:47,580 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-10-28 23:47:47,581 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-10-28 23:47:47,581 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-10-28 23:47:47,581 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-10-28 23:47:47,581 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-10-28 23:47:47,581 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-10-28 23:47:47,582 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-10-28 23:47:47,582 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-10-28 23:47:47,582 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-10-28 23:47:47,583 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-10-28 23:47:47,583 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-10-28 23:47:47,583 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-10-28 23:47:47,584 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-10-28 23:47:47,584 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-10-28 23:47:47,585 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-10-28 23:47:47,585 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-10-28 23:47:47,585 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-10-28 23:47:47,585 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-10-28 23:47:47,586 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-10-28 23:47:47,586 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-10-28 23:47:47,586 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-10-28 23:47:47,586 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-10-28 23:47:47,586 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-10-28 23:47:47,587 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-10-28 23:47:47,587 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-10-28 23:47:47,588 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-10-28 23:47:47,588 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-10-28 23:47:47,590 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-10-28 23:47:47,590 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-10-28 23:47:47,591 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-10-28 23:47:47,591 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-10-28 23:47:47,591 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-10-28 23:47:47,592 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-10-28 23:47:47,592 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-10-28 23:47:47,592 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-10-28 23:47:47,592 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-10-28 23:47:47,592 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-10-28 23:47:47,592 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-10-28 23:47:47,592 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-10-28 23:47:47,593 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-10-28 23:47:47,593 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-10-28 23:47:47,593 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-10-28 23:47:47,593 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-10-28 23:47:47,593 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-10-28 23:47:47,593 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-10-28 23:47:47,593 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-10-28 23:47:47,594 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-10-28 23:47:47,594 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-10-28 23:47:47,594 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-10-28 23:47:47,594 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-10-28 23:47:47,594 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-10-28 23:47:47,594 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-10-28 23:47:47,594 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-10-28 23:47:47,595 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-10-28 23:47:47,595 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-10-28 23:47:47,595 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-10-28 23:47:47,595 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-10-28 23:47:47,595 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-10-28 23:47:47,595 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-10-28 23:47:47,596 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-10-28 23:47:47,596 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-10-28 23:47:47,596 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-10-28 23:47:47,596 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-10-28 23:47:47,596 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-10-28 23:47:47,596 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-10-28 23:47:47,596 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-10-28 23:47:47,597 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-10-28 23:47:47,597 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-10-28 23:47:47,597 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-10-28 23:47:47,597 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-10-28 23:47:47,597 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-10-28 23:47:47,597 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-10-28 23:47:47,598 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-10-28 23:47:47,598 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-10-28 23:47:47,598 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-10-28 23:47:47,599 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-10-28 23:47:47,599 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2021-10-28 23:47:47,599 INFO L130 BoogieDeclarations]: Found specification of procedure cstrchr [2021-10-28 23:47:47,599 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-28 23:47:47,599 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-10-28 23:47:47,599 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-28 23:47:47,600 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-10-28 23:47:47,600 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-28 23:47:47,600 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-10-28 23:47:47,600 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-28 23:47:48,072 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-28 23:47:48,076 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-10-28 23:47:48,078 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 11:47:48 BoogieIcfgContainer [2021-10-28 23:47:48,078 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-28 23:47:48,080 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-28 23:47:48,080 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-28 23:47:48,085 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-28 23:47:48,085 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.10 11:47:46" (1/3) ... [2021-10-28 23:47:48,086 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b45eb6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.10 11:47:48, skipping insertion in model container [2021-10-28 23:47:48,087 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 11:47:47" (2/3) ... [2021-10-28 23:47:48,087 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b45eb6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.10 11:47:48, skipping insertion in model container [2021-10-28 23:47:48,087 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 11:47:48" (3/3) ... [2021-10-28 23:47:48,089 INFO L111 eAbstractionObserver]: Analyzing ICFG cstrchr-alloca-2.i [2021-10-28 23:47:48,095 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-28 23:47:48,096 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 11 error locations. [2021-10-28 23:47:48,150 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-28 23:47:48,158 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, mAutomataTypeConcurrency=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 [2021-10-28 23:47:48,158 INFO L340 AbstractCegarLoop]: Starting to check reachability of 11 error locations. [2021-10-28 23:47:48,175 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) [2021-10-28 23:47:48,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-28 23:47:48,184 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:47:48,185 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 23:47:48,186 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr2REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:47:48,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:47:48,192 INFO L85 PathProgramCache]: Analyzing trace with hash 1287232828, now seen corresponding path program 1 times [2021-10-28 23:47:48,203 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:47:48,204 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477051656] [2021-10-28 23:47:48,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:47:48,205 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:47:48,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:48,456 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:47:48,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:48,467 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:48,468 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:47:48,468 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477051656] [2021-10-28 23:47:48,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [477051656] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 23:47:48,470 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 23:47:48,470 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-28 23:47:48,472 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103824951] [2021-10-28 23:47:48,483 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-28 23:47:48,484 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:47:48,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-28 23:47:48,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-28 23:47:48,508 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) [2021-10-28 23:47:48,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:47:48,613 INFO L93 Difference]: Finished difference Result 43 states and 47 transitions. [2021-10-28 23:47:48,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-28 23:47:48,616 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 [2021-10-28 23:47:48,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:47:48,628 INFO L225 Difference]: With dead ends: 43 [2021-10-28 23:47:48,628 INFO L226 Difference]: Without dead ends: 40 [2021-10-28 23:47:48,631 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-28 23:47:48,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-10-28 23:47:48,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-10-28 23:47:48,670 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) [2021-10-28 23:47:48,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2021-10-28 23:47:48,673 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 10 [2021-10-28 23:47:48,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:47:48,673 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2021-10-28 23:47:48,674 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) [2021-10-28 23:47:48,674 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2021-10-28 23:47:48,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-28 23:47:48,674 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:47:48,675 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 23:47:48,675 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-28 23:47:48,675 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr2REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:47:48,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:47:48,676 INFO L85 PathProgramCache]: Analyzing trace with hash 1287232518, now seen corresponding path program 1 times [2021-10-28 23:47:48,677 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:47:48,677 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102789484] [2021-10-28 23:47:48,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:47:48,677 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:47:48,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:48,761 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:47:48,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:48,774 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:48,775 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:47:48,775 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102789484] [2021-10-28 23:47:48,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [102789484] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 23:47:48,776 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 23:47:48,776 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-28 23:47:48,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860808912] [2021-10-28 23:47:48,778 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-28 23:47:48,779 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:47:48,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-28 23:47:48,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-28 23:47:48,783 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) [2021-10-28 23:47:48,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:47:48,944 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2021-10-28 23:47:48,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-28 23:47:48,945 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 [2021-10-28 23:47:48,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:47:48,946 INFO L225 Difference]: With dead ends: 38 [2021-10-28 23:47:48,946 INFO L226 Difference]: Without dead ends: 38 [2021-10-28 23:47:48,947 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-28 23:47:48,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-10-28 23:47:48,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-10-28 23:47:48,958 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) [2021-10-28 23:47:48,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2021-10-28 23:47:48,959 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 10 [2021-10-28 23:47:48,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:47:48,960 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2021-10-28 23:47:48,960 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) [2021-10-28 23:47:48,960 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2021-10-28 23:47:48,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-28 23:47:48,961 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:47:48,961 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 23:47:48,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-28 23:47:48,962 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr3REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:47:48,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:47:48,963 INFO L85 PathProgramCache]: Analyzing trace with hash 1287232519, now seen corresponding path program 1 times [2021-10-28 23:47:48,963 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:47:48,963 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873400332] [2021-10-28 23:47:48,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:47:48,964 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:47:49,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:49,116 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:47:49,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:49,138 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:49,138 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:47:49,138 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1873400332] [2021-10-28 23:47:49,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1873400332] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 23:47:49,139 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 23:47:49,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-10-28 23:47:49,139 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699281137] [2021-10-28 23:47:49,140 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-28 23:47:49,140 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:47:49,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-28 23:47:49,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-10-28 23:47:49,141 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) [2021-10-28 23:47:49,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:47:49,283 INFO L93 Difference]: Finished difference Result 37 states and 41 transitions. [2021-10-28 23:47:49,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-28 23:47:49,284 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 [2021-10-28 23:47:49,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:47:49,285 INFO L225 Difference]: With dead ends: 37 [2021-10-28 23:47:49,285 INFO L226 Difference]: Without dead ends: 37 [2021-10-28 23:47:49,286 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-10-28 23:47:49,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-10-28 23:47:49,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-10-28 23:47:49,289 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) [2021-10-28 23:47:49,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2021-10-28 23:47:49,291 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 10 [2021-10-28 23:47:49,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:47:49,291 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2021-10-28 23:47:49,292 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) [2021-10-28 23:47:49,292 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2021-10-28 23:47:49,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-28 23:47:49,292 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:47:49,292 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 23:47:49,293 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-10-28 23:47:49,293 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:47:49,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:47:49,297 INFO L85 PathProgramCache]: Analyzing trace with hash 1287232572, now seen corresponding path program 1 times [2021-10-28 23:47:49,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:47:49,298 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1496281950] [2021-10-28 23:47:49,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:47:49,298 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:47:49,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:49,378 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:47:49,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:49,409 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:49,409 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:47:49,409 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1496281950] [2021-10-28 23:47:49,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1496281950] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 23:47:49,410 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 23:47:49,410 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-28 23:47:49,411 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905920388] [2021-10-28 23:47:49,411 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-28 23:47:49,411 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:47:49,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-28 23:47:49,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-10-28 23:47:49,413 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) [2021-10-28 23:47:49,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:47:49,553 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2021-10-28 23:47:49,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-28 23:47:49,554 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 [2021-10-28 23:47:49,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:47:49,559 INFO L225 Difference]: With dead ends: 45 [2021-10-28 23:47:49,559 INFO L226 Difference]: Without dead ends: 45 [2021-10-28 23:47:49,560 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-10-28 23:47:49,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-10-28 23:47:49,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 39. [2021-10-28 23:47:49,576 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) [2021-10-28 23:47:49,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2021-10-28 23:47:49,580 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 10 [2021-10-28 23:47:49,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:47:49,582 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2021-10-28 23:47:49,582 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) [2021-10-28 23:47:49,582 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2021-10-28 23:47:49,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-28 23:47:49,583 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:47:49,583 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 23:47:49,583 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-10-28 23:47:49,585 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:47:49,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:47:49,586 INFO L85 PathProgramCache]: Analyzing trace with hash 1287292154, now seen corresponding path program 1 times [2021-10-28 23:47:49,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:47:49,587 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1036813186] [2021-10-28 23:47:49,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:47:49,588 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:47:49,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:49,717 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:47:49,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:49,729 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:49,729 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:47:49,730 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1036813186] [2021-10-28 23:47:49,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1036813186] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 23:47:49,730 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 23:47:49,730 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-28 23:47:49,731 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477855245] [2021-10-28 23:47:49,731 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-28 23:47:49,731 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:47:49,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-28 23:47:49,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-10-28 23:47:49,733 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) [2021-10-28 23:47:49,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:47:49,857 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2021-10-28 23:47:49,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-28 23:47:49,858 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 [2021-10-28 23:47:49,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:47:49,860 INFO L225 Difference]: With dead ends: 49 [2021-10-28 23:47:49,860 INFO L226 Difference]: Without dead ends: 49 [2021-10-28 23:47:49,860 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-10-28 23:47:49,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-10-28 23:47:49,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 41. [2021-10-28 23:47:49,869 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) [2021-10-28 23:47:49,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2021-10-28 23:47:49,871 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 10 [2021-10-28 23:47:49,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:47:49,872 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2021-10-28 23:47:49,872 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) [2021-10-28 23:47:49,872 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2021-10-28 23:47:49,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-10-28 23:47:49,874 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:47:49,874 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 23:47:49,874 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-10-28 23:47:49,874 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting cstrchrErr0REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:47:49,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:47:49,875 INFO L85 PathProgramCache]: Analyzing trace with hash -554371049, now seen corresponding path program 1 times [2021-10-28 23:47:49,875 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:47:49,875 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657428030] [2021-10-28 23:47:49,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:47:49,876 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:47:49,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:49,959 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:47:49,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:49,968 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:49,968 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:47:49,968 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657428030] [2021-10-28 23:47:49,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657428030] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 23:47:49,969 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 23:47:49,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-28 23:47:49,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304712751] [2021-10-28 23:47:49,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-28 23:47:49,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:47:49,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-28 23:47:49,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-10-28 23:47:49,971 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) [2021-10-28 23:47:50,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:47:50,092 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2021-10-28 23:47:50,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-28 23:47:50,100 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 [2021-10-28 23:47:50,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:47:50,101 INFO L225 Difference]: With dead ends: 38 [2021-10-28 23:47:50,101 INFO L226 Difference]: Without dead ends: 38 [2021-10-28 23:47:50,101 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-10-28 23:47:50,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-10-28 23:47:50,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-10-28 23:47:50,105 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) [2021-10-28 23:47:50,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2021-10-28 23:47:50,106 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 14 [2021-10-28 23:47:50,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:47:50,107 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2021-10-28 23:47:50,107 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) [2021-10-28 23:47:50,107 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2021-10-28 23:47:50,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-10-28 23:47:50,108 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:47:50,108 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 23:47:50,109 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-10-28 23:47:50,109 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:47:50,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:47:50,110 INFO L85 PathProgramCache]: Analyzing trace with hash -554371048, now seen corresponding path program 1 times [2021-10-28 23:47:50,110 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:47:50,110 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2067973945] [2021-10-28 23:47:50,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:47:50,111 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:47:50,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:50,240 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:47:50,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:50,248 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:50,248 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:47:50,248 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2067973945] [2021-10-28 23:47:50,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2067973945] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 23:47:50,249 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 23:47:50,249 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-28 23:47:50,250 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227700706] [2021-10-28 23:47:50,250 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-28 23:47:50,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:47:50,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-28 23:47:50,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-10-28 23:47:50,254 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) [2021-10-28 23:47:50,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:47:50,469 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2021-10-28 23:47:50,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-28 23:47:50,470 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 [2021-10-28 23:47:50,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:47:50,473 INFO L225 Difference]: With dead ends: 49 [2021-10-28 23:47:50,473 INFO L226 Difference]: Without dead ends: 49 [2021-10-28 23:47:50,474 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-10-28 23:47:50,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-10-28 23:47:50,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 45. [2021-10-28 23:47:50,478 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) [2021-10-28 23:47:50,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 52 transitions. [2021-10-28 23:47:50,479 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 52 transitions. Word has length 14 [2021-10-28 23:47:50,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:47:50,479 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 52 transitions. [2021-10-28 23:47:50,479 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) [2021-10-28 23:47:50,479 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 52 transitions. [2021-10-28 23:47:50,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-10-28 23:47:50,480 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:47:50,480 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 23:47:50,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-10-28 23:47:50,481 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:47:50,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:47:50,481 INFO L85 PathProgramCache]: Analyzing trace with hash -1315055555, now seen corresponding path program 1 times [2021-10-28 23:47:50,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:47:50,482 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2144601780] [2021-10-28 23:47:50,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:47:50,482 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:47:50,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:50,611 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:47:50,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:50,623 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:50,623 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:47:50,623 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2144601780] [2021-10-28 23:47:50,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2144601780] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:47:50,624 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [965156134] [2021-10-28 23:47:50,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:47:50,624 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:47:50,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 [2021-10-28 23:47:50,630 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 23:47:50,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-28 23:47:50,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:50,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 11 conjunts are in the unsatisfiable core [2021-10-28 23:47:50,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 23:47:50,913 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 [2021-10-28 23:47:51,031 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:51,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [965156134] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:47:51,032 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 23:47:51,032 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-10-28 23:47:51,032 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99299642] [2021-10-28 23:47:51,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-28 23:47:51,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:47:51,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-28 23:47:51,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-10-28 23:47:51,034 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) [2021-10-28 23:47:51,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:47:51,176 INFO L93 Difference]: Finished difference Result 52 states and 59 transitions. [2021-10-28 23:47:51,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-28 23:47:51,177 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 [2021-10-28 23:47:51,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:47:51,180 INFO L225 Difference]: With dead ends: 52 [2021-10-28 23:47:51,180 INFO L226 Difference]: Without dead ends: 52 [2021-10-28 23:47:51,180 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-10-28 23:47:51,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-10-28 23:47:51,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 42. [2021-10-28 23:47:51,186 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) [2021-10-28 23:47:51,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2021-10-28 23:47:51,187 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 14 [2021-10-28 23:47:51,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:47:51,188 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2021-10-28 23:47:51,190 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) [2021-10-28 23:47:51,190 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2021-10-28 23:47:51,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-10-28 23:47:51,191 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:47:51,191 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 23:47:51,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-28 23:47:51,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:47:51,406 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:47:51,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:47:51,407 INFO L85 PathProgramCache]: Analyzing trace with hash -319565009, now seen corresponding path program 1 times [2021-10-28 23:47:51,407 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:47:51,407 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038588497] [2021-10-28 23:47:51,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:47:51,407 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:47:51,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:51,451 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:47:51,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:51,461 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:51,461 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:47:51,461 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038588497] [2021-10-28 23:47:51,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1038588497] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 23:47:51,462 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 23:47:51,462 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-10-28 23:47:51,462 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403121902] [2021-10-28 23:47:51,463 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-28 23:47:51,463 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:47:51,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-28 23:47:51,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-28 23:47:51,464 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) [2021-10-28 23:47:51,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:47:51,533 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2021-10-28 23:47:51,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-28 23:47:51,534 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 [2021-10-28 23:47:51,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:47:51,535 INFO L225 Difference]: With dead ends: 44 [2021-10-28 23:47:51,535 INFO L226 Difference]: Without dead ends: 44 [2021-10-28 23:47:51,535 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-28 23:47:51,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-10-28 23:47:51,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-10-28 23:47:51,544 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) [2021-10-28 23:47:51,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 50 transitions. [2021-10-28 23:47:51,552 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 50 transitions. Word has length 18 [2021-10-28 23:47:51,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:47:51,552 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 50 transitions. [2021-10-28 23:47:51,552 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) [2021-10-28 23:47:51,552 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 50 transitions. [2021-10-28 23:47:51,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-10-28 23:47:51,556 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:47:51,556 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 23:47:51,556 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-10-28 23:47:51,556 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:47:51,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:47:51,557 INFO L85 PathProgramCache]: Analyzing trace with hash 2129811308, now seen corresponding path program 1 times [2021-10-28 23:47:51,557 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:47:51,557 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805748666] [2021-10-28 23:47:51,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:47:51,558 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:47:51,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:51,725 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:47:51,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:51,731 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:51,731 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:47:51,731 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [805748666] [2021-10-28 23:47:51,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [805748666] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 23:47:51,732 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 23:47:51,732 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-10-28 23:47:51,732 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108349467] [2021-10-28 23:47:51,745 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-28 23:47:51,745 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:47:51,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-28 23:47:51,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-10-28 23:47:51,747 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) [2021-10-28 23:47:51,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:47:51,994 INFO L93 Difference]: Finished difference Result 60 states and 66 transitions. [2021-10-28 23:47:51,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-10-28 23:47:51,995 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 [2021-10-28 23:47:51,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:47:51,996 INFO L225 Difference]: With dead ends: 60 [2021-10-28 23:47:51,996 INFO L226 Difference]: Without dead ends: 60 [2021-10-28 23:47:51,997 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2021-10-28 23:47:51,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-10-28 23:47:52,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 57. [2021-10-28 23:47:52,001 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) [2021-10-28 23:47:52,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 64 transitions. [2021-10-28 23:47:52,002 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 64 transitions. Word has length 20 [2021-10-28 23:47:52,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:47:52,002 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 64 transitions. [2021-10-28 23:47:52,002 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) [2021-10-28 23:47:52,002 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 64 transitions. [2021-10-28 23:47:52,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-10-28 23:47:52,003 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:47:52,003 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 23:47:52,004 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-10-28 23:47:52,004 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:47:52,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:47:52,007 INFO L85 PathProgramCache]: Analyzing trace with hash 1118694058, now seen corresponding path program 1 times [2021-10-28 23:47:52,007 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:47:52,007 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376360794] [2021-10-28 23:47:52,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:47:52,008 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:47:52,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:52,203 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:47:52,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:52,208 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:52,208 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:47:52,209 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376360794] [2021-10-28 23:47:52,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1376360794] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 23:47:52,209 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 23:47:52,209 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-10-28 23:47:52,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159065548] [2021-10-28 23:47:52,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-10-28 23:47:52,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:47:52,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-10-28 23:47:52,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-10-28 23:47:52,212 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) [2021-10-28 23:47:52,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:47:52,487 INFO L93 Difference]: Finished difference Result 77 states and 85 transitions. [2021-10-28 23:47:52,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-28 23:47:52,488 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 [2021-10-28 23:47:52,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:47:52,489 INFO L225 Difference]: With dead ends: 77 [2021-10-28 23:47:52,490 INFO L226 Difference]: Without dead ends: 77 [2021-10-28 23:47:52,490 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2021-10-28 23:47:52,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-10-28 23:47:52,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 58. [2021-10-28 23:47:52,495 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) [2021-10-28 23:47:52,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2021-10-28 23:47:52,496 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 20 [2021-10-28 23:47:52,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:47:52,496 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2021-10-28 23:47:52,496 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) [2021-10-28 23:47:52,497 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2021-10-28 23:47:52,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-10-28 23:47:52,498 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:47:52,498 INFO L513 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] [2021-10-28 23:47:52,498 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-10-28 23:47:52,498 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting mainErr4ENSURES_VIOLATIONMEMORY_LEAK === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:47:52,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:47:52,499 INFO L85 PathProgramCache]: Analyzing trace with hash 842532891, now seen corresponding path program 1 times [2021-10-28 23:47:52,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:47:52,499 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [662461515] [2021-10-28 23:47:52,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:47:52,500 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:47:52,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:52,560 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:47:52,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:52,566 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-10-28 23:47:52,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:52,579 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:52,579 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:47:52,580 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [662461515] [2021-10-28 23:47:52,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [662461515] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 23:47:52,580 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 23:47:52,582 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-10-28 23:47:52,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185576853] [2021-10-28 23:47:52,583 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-28 23:47:52,583 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:47:52,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-28 23:47:52,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-10-28 23:47:52,584 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) [2021-10-28 23:47:52,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:47:52,632 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2021-10-28 23:47:52,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-28 23:47:52,633 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 [2021-10-28 23:47:52,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:47:52,634 INFO L225 Difference]: With dead ends: 57 [2021-10-28 23:47:52,634 INFO L226 Difference]: Without dead ends: 34 [2021-10-28 23:47:52,634 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-10-28 23:47:52,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-10-28 23:47:52,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-10-28 23:47:52,637 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) [2021-10-28 23:47:52,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2021-10-28 23:47:52,638 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 24 [2021-10-28 23:47:52,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:47:52,638 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2021-10-28 23:47:52,638 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) [2021-10-28 23:47:52,638 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2021-10-28 23:47:52,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-10-28 23:47:52,639 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:47:52,639 INFO L513 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] [2021-10-28 23:47:52,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-10-28 23:47:52,640 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:47:52,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:47:52,640 INFO L85 PathProgramCache]: Analyzing trace with hash 1168131629, now seen corresponding path program 1 times [2021-10-28 23:47:52,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:47:52,640 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1458075184] [2021-10-28 23:47:52,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:47:52,641 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:47:52,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:52,786 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:47:52,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:52,796 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:52,796 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:47:52,796 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1458075184] [2021-10-28 23:47:52,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1458075184] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:47:52,797 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [369842219] [2021-10-28 23:47:52,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:47:52,797 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:47:52,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 [2021-10-28 23:47:52,802 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 23:47:52,817 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-28 23:47:52,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:52,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 17 conjunts are in the unsatisfiable core [2021-10-28 23:47:52,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 23:47:53,148 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:53,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [369842219] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:47:53,148 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 23:47:53,148 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 15 [2021-10-28 23:47:53,148 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109226412] [2021-10-28 23:47:53,149 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-10-28 23:47:53,149 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:47:53,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-10-28 23:47:53,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-10-28 23:47:53,150 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) [2021-10-28 23:47:53,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:47:53,343 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2021-10-28 23:47:53,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-28 23:47:53,343 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 [2021-10-28 23:47:53,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:47:53,344 INFO L225 Difference]: With dead ends: 45 [2021-10-28 23:47:53,344 INFO L226 Difference]: Without dead ends: 43 [2021-10-28 23:47:53,344 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2021-10-28 23:47:53,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-10-28 23:47:53,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2021-10-28 23:47:53,346 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) [2021-10-28 23:47:53,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-10-28 23:47:53,346 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 24 [2021-10-28 23:47:53,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:47:53,347 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-10-28 23:47:53,347 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) [2021-10-28 23:47:53,347 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-10-28 23:47:53,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-10-28 23:47:53,348 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:47:53,348 INFO L513 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] [2021-10-28 23:47:53,389 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-10-28 23:47:53,565 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-10-28 23:47:53,565 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:47:53,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:47:53,566 INFO L85 PathProgramCache]: Analyzing trace with hash 1984823745, now seen corresponding path program 2 times [2021-10-28 23:47:53,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:47:53,566 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1002376160] [2021-10-28 23:47:53,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:47:53,567 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:47:53,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:53,876 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:47:53,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:53,890 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:53,890 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:47:53,890 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1002376160] [2021-10-28 23:47:53,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1002376160] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:47:53,891 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1818195585] [2021-10-28 23:47:53,891 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-28 23:47:53,891 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:47:53,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 [2021-10-28 23:47:53,893 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 23:47:53,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-10-28 23:47:54,032 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-28 23:47:54,032 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-28 23:47:54,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 26 conjunts are in the unsatisfiable core [2021-10-28 23:47:54,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 23:47:54,122 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 [2021-10-28 23:47:54,866 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-28 23:47:54,866 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 [2021-10-28 23:47:55,157 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:55,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1818195585] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:47:55,158 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 23:47:55,158 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 24 [2021-10-28 23:47:55,158 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080048915] [2021-10-28 23:47:55,159 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-10-28 23:47:55,159 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:47:55,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-10-28 23:47:55,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=496, Unknown=0, NotChecked=0, Total=552 [2021-10-28 23:47:55,160 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) [2021-10-28 23:47:56,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:47:56,877 INFO L93 Difference]: Finished difference Result 68 states and 71 transitions. [2021-10-28 23:47:56,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-10-28 23:47:56,878 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 [2021-10-28 23:47:56,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:47:56,879 INFO L225 Difference]: With dead ends: 68 [2021-10-28 23:47:56,879 INFO L226 Difference]: Without dead ends: 53 [2021-10-28 23:47:56,880 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=242, Invalid=1738, Unknown=0, NotChecked=0, Total=1980 [2021-10-28 23:47:56,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-10-28 23:47:56,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2021-10-28 23:47:56,883 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) [2021-10-28 23:47:56,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2021-10-28 23:47:56,884 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 30 [2021-10-28 23:47:56,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:47:56,885 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2021-10-28 23:47:56,885 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) [2021-10-28 23:47:56,886 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2021-10-28 23:47:56,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-10-28 23:47:56,887 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:47:56,887 INFO L513 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] [2021-10-28 23:47:56,924 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-10-28 23:47:57,109 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:47:57,109 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:47:57,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:47:57,110 INFO L85 PathProgramCache]: Analyzing trace with hash -77155368, now seen corresponding path program 3 times [2021-10-28 23:47:57,110 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:47:57,110 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [722799272] [2021-10-28 23:47:57,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:47:57,110 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:47:57,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:57,350 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:47:57,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:57,354 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 9 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:57,356 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:47:57,357 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [722799272] [2021-10-28 23:47:57,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [722799272] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:47:57,357 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1363086704] [2021-10-28 23:47:57,357 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-28 23:47:57,358 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:47:57,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 [2021-10-28 23:47:57,370 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 23:47:57,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-10-28 23:47:57,576 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-10-28 23:47:57,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-28 23:47:57,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 30 conjunts are in the unsatisfiable core [2021-10-28 23:47:57,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 23:47:57,797 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 [2021-10-28 23:47:58,118 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 [2021-10-28 23:47:58,139 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 9 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:58,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1363086704] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:47:58,139 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 23:47:58,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 23 [2021-10-28 23:47:58,140 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364174251] [2021-10-28 23:47:58,141 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-10-28 23:47:58,141 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:47:58,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-10-28 23:47:58,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=452, Unknown=0, NotChecked=0, Total=506 [2021-10-28 23:47:58,145 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) [2021-10-28 23:47:58,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:47:58,825 INFO L93 Difference]: Finished difference Result 76 states and 78 transitions. [2021-10-28 23:47:58,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-28 23:47:58,826 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 [2021-10-28 23:47:58,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:47:58,827 INFO L225 Difference]: With dead ends: 76 [2021-10-28 23:47:58,827 INFO L226 Difference]: Without dead ends: 57 [2021-10-28 23:47:58,828 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=129, Invalid=927, Unknown=0, NotChecked=0, Total=1056 [2021-10-28 23:47:58,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-10-28 23:47:58,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2021-10-28 23:47:58,830 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) [2021-10-28 23:47:58,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2021-10-28 23:47:58,831 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 40 [2021-10-28 23:47:58,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:47:58,831 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2021-10-28 23:47:58,832 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) [2021-10-28 23:47:58,832 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2021-10-28 23:47:58,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-10-28 23:47:58,839 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:47:58,840 INFO L513 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] [2021-10-28 23:47:58,865 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-10-28 23:47:59,059 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-10-28 23:47:59,059 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:47:59,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:47:59,059 INFO L85 PathProgramCache]: Analyzing trace with hash -488427557, now seen corresponding path program 4 times [2021-10-28 23:47:59,060 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:47:59,060 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209309535] [2021-10-28 23:47:59,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:47:59,060 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:47:59,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:59,267 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:47:59,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:47:59,271 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:47:59,272 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:47:59,272 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209309535] [2021-10-28 23:47:59,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1209309535] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:47:59,272 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2131901767] [2021-10-28 23:47:59,272 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-28 23:47:59,273 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:47:59,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 [2021-10-28 23:47:59,278 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 23:47:59,302 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-10-28 23:47:59,516 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-28 23:47:59,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-28 23:47:59,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 36 conjunts are in the unsatisfiable core [2021-10-28 23:47:59,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 23:47:59,549 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 [2021-10-28 23:47:59,782 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 [2021-10-28 23:48:00,187 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-28 23:48:00,188 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 [2021-10-28 23:48:00,459 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 8 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:48:00,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2131901767] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:48:00,460 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 23:48:00,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 15] total 24 [2021-10-28 23:48:00,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208767041] [2021-10-28 23:48:00,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-10-28 23:48:00,461 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:48:00,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-10-28 23:48:00,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=542, Unknown=0, NotChecked=0, Total=600 [2021-10-28 23:48:00,462 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) [2021-10-28 23:48:01,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:48:01,365 INFO L93 Difference]: Finished difference Result 62 states and 65 transitions. [2021-10-28 23:48:01,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-10-28 23:48:01,366 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 [2021-10-28 23:48:01,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:48:01,367 INFO L225 Difference]: With dead ends: 62 [2021-10-28 23:48:01,367 INFO L226 Difference]: Without dead ends: 60 [2021-10-28 23:48:01,368 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=133, Invalid=989, Unknown=0, NotChecked=0, Total=1122 [2021-10-28 23:48:01,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-10-28 23:48:01,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-10-28 23:48:01,371 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) [2021-10-28 23:48:01,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2021-10-28 23:48:01,372 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 44 [2021-10-28 23:48:01,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:48:01,372 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2021-10-28 23:48:01,373 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) [2021-10-28 23:48:01,373 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2021-10-28 23:48:01,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-10-28 23:48:01,374 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:48:01,374 INFO L513 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] [2021-10-28 23:48:01,420 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-10-28 23:48:01,575 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-10-28 23:48:01,575 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:48:01,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:48:01,576 INFO L85 PathProgramCache]: Analyzing trace with hash 444231919, now seen corresponding path program 5 times [2021-10-28 23:48:01,576 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:48:01,576 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234541870] [2021-10-28 23:48:01,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:48:01,576 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:48:01,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:48:01,841 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:48:01,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:48:01,846 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 13 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:48:01,846 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:48:01,846 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234541870] [2021-10-28 23:48:01,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [234541870] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:48:01,847 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1321282172] [2021-10-28 23:48:01,847 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-10-28 23:48:01,847 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:48:01,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 [2021-10-28 23:48:01,853 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 23:48:01,873 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-10-28 23:48:02,118 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-10-28 23:48:02,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-28 23:48:02,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 36 conjunts are in the unsatisfiable core [2021-10-28 23:48:02,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 23:48:02,351 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 [2021-10-28 23:48:02,710 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 [2021-10-28 23:48:02,724 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 13 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:48:02,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1321282172] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:48:02,725 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 23:48:02,725 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 26 [2021-10-28 23:48:02,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399461031] [2021-10-28 23:48:02,726 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-10-28 23:48:02,726 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:48:02,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-10-28 23:48:02,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=589, Unknown=0, NotChecked=0, Total=650 [2021-10-28 23:48:02,727 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) [2021-10-28 23:48:03,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:48:03,466 INFO L93 Difference]: Finished difference Result 92 states and 94 transitions. [2021-10-28 23:48:03,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-10-28 23:48:03,469 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 [2021-10-28 23:48:03,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:48:03,472 INFO L225 Difference]: With dead ends: 92 [2021-10-28 23:48:03,472 INFO L226 Difference]: Without dead ends: 67 [2021-10-28 23:48:03,473 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=143, Invalid=1189, Unknown=0, NotChecked=0, Total=1332 [2021-10-28 23:48:03,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-10-28 23:48:03,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2021-10-28 23:48:03,480 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) [2021-10-28 23:48:03,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2021-10-28 23:48:03,481 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 50 [2021-10-28 23:48:03,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:48:03,497 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2021-10-28 23:48:03,497 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) [2021-10-28 23:48:03,497 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2021-10-28 23:48:03,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-10-28 23:48:03,498 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:48:03,498 INFO L513 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] [2021-10-28 23:48:03,534 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-10-28 23:48:03,721 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-10-28 23:48:03,721 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:48:03,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:48:03,722 INFO L85 PathProgramCache]: Analyzing trace with hash 1547306290, now seen corresponding path program 6 times [2021-10-28 23:48:03,722 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:48:03,722 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672648053] [2021-10-28 23:48:03,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:48:03,722 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:48:03,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:48:03,980 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:48:03,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:48:03,988 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 6 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:48:03,988 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:48:03,989 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [672648053] [2021-10-28 23:48:03,989 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [672648053] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:48:03,989 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016474850] [2021-10-28 23:48:03,989 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-10-28 23:48:03,989 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:48:03,989 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 [2021-10-28 23:48:03,991 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 23:48:03,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-10-28 23:48:04,252 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-10-28 23:48:04,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-28 23:48:04,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 31 conjunts are in the unsatisfiable core [2021-10-28 23:48:04,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 23:48:04,298 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 [2021-10-28 23:48:04,981 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 15 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:48:04,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016474850] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:48:04,982 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 23:48:04,982 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 26 [2021-10-28 23:48:04,983 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722026199] [2021-10-28 23:48:04,983 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-10-28 23:48:04,983 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:48:04,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-10-28 23:48:04,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=616, Unknown=0, NotChecked=0, Total=702 [2021-10-28 23:48:04,985 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) [2021-10-28 23:48:05,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:48:05,582 INFO L93 Difference]: Finished difference Result 72 states and 75 transitions. [2021-10-28 23:48:05,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-10-28 23:48:05,582 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 [2021-10-28 23:48:05,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:48:05,583 INFO L225 Difference]: With dead ends: 72 [2021-10-28 23:48:05,583 INFO L226 Difference]: Without dead ends: 70 [2021-10-28 23:48:05,584 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=156, Invalid=966, Unknown=0, NotChecked=0, Total=1122 [2021-10-28 23:48:05,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-10-28 23:48:05,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-10-28 23:48:05,587 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) [2021-10-28 23:48:05,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2021-10-28 23:48:05,588 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 54 [2021-10-28 23:48:05,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:48:05,588 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2021-10-28 23:48:05,589 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) [2021-10-28 23:48:05,589 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2021-10-28 23:48:05,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-10-28 23:48:05,590 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:48:05,590 INFO L513 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] [2021-10-28 23:48:05,626 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-10-28 23:48:05,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-10-28 23:48:05,805 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:48:05,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:48:05,806 INFO L85 PathProgramCache]: Analyzing trace with hash 1155246342, now seen corresponding path program 7 times [2021-10-28 23:48:05,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:48:05,806 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343938835] [2021-10-28 23:48:05,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:48:05,807 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:48:05,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:48:06,186 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:48:06,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:48:06,192 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 17 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:48:06,192 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:48:06,192 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343938835] [2021-10-28 23:48:06,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343938835] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:48:06,193 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1130826857] [2021-10-28 23:48:06,193 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-10-28 23:48:06,193 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:48:06,193 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 [2021-10-28 23:48:06,207 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 23:48:06,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-10-28 23:48:06,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:48:06,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 42 conjunts are in the unsatisfiable core [2021-10-28 23:48:06,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 23:48:06,720 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 [2021-10-28 23:48:07,102 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 [2021-10-28 23:48:07,118 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 17 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:48:07,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1130826857] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:48:07,119 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 23:48:07,119 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 29 [2021-10-28 23:48:07,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329747705] [2021-10-28 23:48:07,119 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-10-28 23:48:07,120 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:48:07,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-10-28 23:48:07,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=744, Unknown=0, NotChecked=0, Total=812 [2021-10-28 23:48:07,121 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) [2021-10-28 23:48:08,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:48:08,036 INFO L93 Difference]: Finished difference Result 108 states and 110 transitions. [2021-10-28 23:48:08,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-10-28 23:48:08,037 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 [2021-10-28 23:48:08,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:48:08,038 INFO L225 Difference]: With dead ends: 108 [2021-10-28 23:48:08,038 INFO L226 Difference]: Without dead ends: 77 [2021-10-28 23:48:08,039 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=157, Invalid=1483, Unknown=0, NotChecked=0, Total=1640 [2021-10-28 23:48:08,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-10-28 23:48:08,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2021-10-28 23:48:08,042 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) [2021-10-28 23:48:08,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2021-10-28 23:48:08,043 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 60 [2021-10-28 23:48:08,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:48:08,050 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2021-10-28 23:48:08,051 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) [2021-10-28 23:48:08,051 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2021-10-28 23:48:08,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-10-28 23:48:08,052 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:48:08,052 INFO L513 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] [2021-10-28 23:48:08,085 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-10-28 23:48:08,261 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:48:08,261 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:48:08,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:48:08,262 INFO L85 PathProgramCache]: Analyzing trace with hash -754121335, now seen corresponding path program 8 times [2021-10-28 23:48:08,262 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:48:08,262 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [676761230] [2021-10-28 23:48:08,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:48:08,262 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:48:08,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:48:08,569 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:48:08,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:48:08,574 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 15 proven. 95 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:48:08,574 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:48:08,574 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [676761230] [2021-10-28 23:48:08,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [676761230] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:48:08,574 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [453785790] [2021-10-28 23:48:08,574 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-28 23:48:08,575 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:48:08,575 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 [2021-10-28 23:48:08,577 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 23:48:08,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-10-28 23:48:08,888 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-28 23:48:08,888 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-28 23:48:08,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 37 conjunts are in the unsatisfiable core [2021-10-28 23:48:08,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 23:48:09,355 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 28 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:48:09,356 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [453785790] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:48:09,356 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 23:48:09,356 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 26 [2021-10-28 23:48:09,356 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835889242] [2021-10-28 23:48:09,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-10-28 23:48:09,357 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:48:09,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-10-28 23:48:09,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=612, Unknown=0, NotChecked=0, Total=702 [2021-10-28 23:48:09,358 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) [2021-10-28 23:48:09,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:48:09,864 INFO L93 Difference]: Finished difference Result 82 states and 85 transitions. [2021-10-28 23:48:09,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-28 23:48:09,865 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 [2021-10-28 23:48:09,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:48:09,866 INFO L225 Difference]: With dead ends: 82 [2021-10-28 23:48:09,866 INFO L226 Difference]: Without dead ends: 80 [2021-10-28 23:48:09,867 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=154, Invalid=1036, Unknown=0, NotChecked=0, Total=1190 [2021-10-28 23:48:09,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-10-28 23:48:09,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2021-10-28 23:48:09,869 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) [2021-10-28 23:48:09,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2021-10-28 23:48:09,871 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 64 [2021-10-28 23:48:09,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:48:09,871 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2021-10-28 23:48:09,872 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) [2021-10-28 23:48:09,872 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2021-10-28 23:48:09,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-10-28 23:48:09,873 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:48:09,873 INFO L513 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] [2021-10-28 23:48:09,901 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-10-28 23:48:10,077 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:48:10,077 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:48:10,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:48:10,078 INFO L85 PathProgramCache]: Analyzing trace with hash 195873821, now seen corresponding path program 9 times [2021-10-28 23:48:10,078 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:48:10,078 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134853670] [2021-10-28 23:48:10,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:48:10,078 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:48:10,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:48:10,461 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:48:10,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:48:10,475 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 21 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:48:10,475 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:48:10,475 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134853670] [2021-10-28 23:48:10,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134853670] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:48:10,476 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [157393537] [2021-10-28 23:48:10,476 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-28 23:48:10,476 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:48:10,476 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 [2021-10-28 23:48:10,493 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 23:48:10,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-10-28 23:48:10,989 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-10-28 23:48:10,989 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-28 23:48:10,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 41 conjunts are in the unsatisfiable core [2021-10-28 23:48:10,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 23:48:11,223 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 [2021-10-28 23:48:16,908 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-28 23:48:16,909 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 [2021-10-28 23:48:17,260 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 28 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:48:17,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [157393537] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:48:17,260 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 23:48:17,261 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 40 [2021-10-28 23:48:17,261 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510310215] [2021-10-28 23:48:17,261 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-10-28 23:48:17,261 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:48:17,262 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-10-28 23:48:17,262 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=1419, Unknown=2, NotChecked=0, Total=1560 [2021-10-28 23:48:17,262 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) [2021-10-28 23:48:54,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:48:54,047 INFO L93 Difference]: Finished difference Result 132 states and 135 transitions. [2021-10-28 23:48:54,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-10-28 23:48:54,048 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 [2021-10-28 23:48:54,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:48:54,049 INFO L225 Difference]: With dead ends: 132 [2021-10-28 23:48:54,050 INFO L226 Difference]: Without dead ends: 93 [2021-10-28 23:48:54,052 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 711 ImplicationChecksByTransitivity, 38.2s TimeCoverageRelationStatistics Valid=559, Invalid=4129, Unknown=4, NotChecked=0, Total=4692 [2021-10-28 23:48:54,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-10-28 23:48:54,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2021-10-28 23:48:54,055 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) [2021-10-28 23:48:54,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2021-10-28 23:48:54,057 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 70 [2021-10-28 23:48:54,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:48:54,057 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2021-10-28 23:48:54,057 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) [2021-10-28 23:48:54,058 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2021-10-28 23:48:54,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-10-28 23:48:54,059 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:48:54,059 INFO L513 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] [2021-10-28 23:48:54,085 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-10-28 23:48:54,269 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:48:54,270 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:48:54,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:48:54,270 INFO L85 PathProgramCache]: Analyzing trace with hash 383797812, now seen corresponding path program 10 times [2021-10-28 23:48:54,270 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:48:54,270 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [875033343] [2021-10-28 23:48:54,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:48:54,270 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:48:54,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:48:54,787 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:48:54,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:48:54,807 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 25 proven. 174 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:48:54,807 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:48:54,807 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [875033343] [2021-10-28 23:48:54,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [875033343] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:48:54,807 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1581144120] [2021-10-28 23:48:54,808 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-28 23:48:54,808 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:48:54,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 [2021-10-28 23:48:54,821 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 23:48:54,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-10-28 23:48:55,235 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-28 23:48:55,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-28 23:48:55,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 44 conjunts are in the unsatisfiable core [2021-10-28 23:48:55,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 23:48:55,263 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 [2021-10-28 23:48:55,838 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 [2021-10-28 23:48:56,800 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-10-28 23:48:56,800 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 [2021-10-28 23:48:56,825 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 121 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:48:56,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1581144120] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:48:56,826 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 23:48:56,826 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 41 [2021-10-28 23:48:56,826 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847825185] [2021-10-28 23:48:56,827 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-10-28 23:48:56,827 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:48:56,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-10-28 23:48:56,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1511, Unknown=0, NotChecked=0, Total=1640 [2021-10-28 23:48:56,829 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) [2021-10-28 23:48:58,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:48:58,492 INFO L93 Difference]: Finished difference Result 140 states and 142 transitions. [2021-10-28 23:48:58,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-10-28 23:48:58,493 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 [2021-10-28 23:48:58,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:48:58,494 INFO L225 Difference]: With dead ends: 140 [2021-10-28 23:48:58,494 INFO L226 Difference]: Without dead ends: 97 [2021-10-28 23:48:58,495 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 390 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=334, Invalid=3448, Unknown=0, NotChecked=0, Total=3782 [2021-10-28 23:48:58,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-10-28 23:48:58,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 94. [2021-10-28 23:48:58,498 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) [2021-10-28 23:48:58,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2021-10-28 23:48:58,499 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 80 [2021-10-28 23:48:58,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:48:58,500 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2021-10-28 23:48:58,500 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) [2021-10-28 23:48:58,500 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2021-10-28 23:48:58,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-10-28 23:48:58,501 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:48:58,501 INFO L513 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] [2021-10-28 23:48:58,530 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-10-28 23:48:58,717 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-10-28 23:48:58,717 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:48:58,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:48:58,718 INFO L85 PathProgramCache]: Analyzing trace with hash 219236151, now seen corresponding path program 11 times [2021-10-28 23:48:58,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:48:58,718 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [84925479] [2021-10-28 23:48:58,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:48:58,718 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:48:58,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:48:59,160 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:48:59,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:48:59,171 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 45 proven. 179 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:48:59,171 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:48:59,171 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [84925479] [2021-10-28 23:48:59,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [84925479] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:48:59,172 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1319457771] [2021-10-28 23:48:59,172 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-10-28 23:48:59,172 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:48:59,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 [2021-10-28 23:48:59,175 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 23:48:59,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-10-28 23:48:59,644 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-10-28 23:48:59,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-28 23:48:59,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 52 conjunts are in the unsatisfiable core [2021-10-28 23:48:59,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 23:48:59,678 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 [2021-10-28 23:49:00,600 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 66 proven. 158 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:49:00,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1319457771] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:49:00,601 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 23:49:00,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18] total 28 [2021-10-28 23:49:00,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429546754] [2021-10-28 23:49:00,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-10-28 23:49:00,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:49:00,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-10-28 23:49:00,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=727, Unknown=0, NotChecked=0, Total=812 [2021-10-28 23:49:00,603 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) [2021-10-28 23:49:01,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:49:01,527 INFO L93 Difference]: Finished difference Result 102 states and 105 transitions. [2021-10-28 23:49:01,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-10-28 23:49:01,528 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 [2021-10-28 23:49:01,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:49:01,529 INFO L225 Difference]: With dead ends: 102 [2021-10-28 23:49:01,529 INFO L226 Difference]: Without dead ends: 100 [2021-10-28 23:49:01,530 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=155, Invalid=1327, Unknown=0, NotChecked=0, Total=1482 [2021-10-28 23:49:01,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-10-28 23:49:01,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-10-28 23:49:01,533 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) [2021-10-28 23:49:01,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 102 transitions. [2021-10-28 23:49:01,534 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 102 transitions. Word has length 84 [2021-10-28 23:49:01,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:49:01,534 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 102 transitions. [2021-10-28 23:49:01,535 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) [2021-10-28 23:49:01,535 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 102 transitions. [2021-10-28 23:49:01,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-10-28 23:49:01,536 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:49:01,536 INFO L513 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] [2021-10-28 23:49:01,568 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-10-28 23:49:01,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-10-28 23:49:01,749 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:49:01,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:49:01,749 INFO L85 PathProgramCache]: Analyzing trace with hash 473469771, now seen corresponding path program 12 times [2021-10-28 23:49:01,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:49:01,750 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11684647] [2021-10-28 23:49:01,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:49:01,750 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:49:01,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:49:02,276 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:49:02,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:49:02,280 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 29 proven. 238 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:49:02,281 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:49:02,281 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11684647] [2021-10-28 23:49:02,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [11684647] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:49:02,281 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2004856812] [2021-10-28 23:49:02,281 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-10-28 23:49:02,281 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:49:02,281 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 [2021-10-28 23:49:02,282 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 23:49:02,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-10-28 23:49:02,854 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-10-28 23:49:02,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-28 23:49:02,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 58 conjunts are in the unsatisfiable core [2021-10-28 23:49:02,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 23:49:03,254 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 [2021-10-28 23:49:03,796 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 [2021-10-28 23:49:03,813 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 29 proven. 238 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:49:03,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2004856812] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:49:03,813 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 23:49:03,813 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 38 [2021-10-28 23:49:03,813 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341182487] [2021-10-28 23:49:03,814 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-10-28 23:49:03,814 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:49:03,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-10-28 23:49:03,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1317, Unknown=0, NotChecked=0, Total=1406 [2021-10-28 23:49:03,815 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) [2021-10-28 23:49:05,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:49:05,510 INFO L93 Difference]: Finished difference Result 156 states and 158 transitions. [2021-10-28 23:49:05,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-10-28 23:49:05,511 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 [2021-10-28 23:49:05,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:49:05,512 INFO L225 Difference]: With dead ends: 156 [2021-10-28 23:49:05,512 INFO L226 Difference]: Without dead ends: 107 [2021-10-28 23:49:05,513 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 78 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=199, Invalid=2557, Unknown=0, NotChecked=0, Total=2756 [2021-10-28 23:49:05,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-10-28 23:49:05,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 104. [2021-10-28 23:49:05,516 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) [2021-10-28 23:49:05,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 106 transitions. [2021-10-28 23:49:05,517 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 106 transitions. Word has length 90 [2021-10-28 23:49:05,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:49:05,518 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 106 transitions. [2021-10-28 23:49:05,518 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) [2021-10-28 23:49:05,518 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 106 transitions. [2021-10-28 23:49:05,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-10-28 23:49:05,520 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:49:05,520 INFO L513 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] [2021-10-28 23:49:05,552 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-10-28 23:49:05,731 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-10-28 23:49:05,732 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:49:05,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:49:05,732 INFO L85 PathProgramCache]: Analyzing trace with hash -641767282, now seen corresponding path program 13 times [2021-10-28 23:49:05,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:49:05,733 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [290315198] [2021-10-28 23:49:05,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:49:05,733 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:49:05,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:49:06,289 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:49:06,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:49:06,295 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 66 proven. 230 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:49:06,295 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:49:06,295 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [290315198] [2021-10-28 23:49:06,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [290315198] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:49:06,296 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [367576172] [2021-10-28 23:49:06,296 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-10-28 23:49:06,296 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:49:06,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 [2021-10-28 23:49:06,297 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 23:49:06,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-10-28 23:49:06,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:49:06,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 52 conjunts are in the unsatisfiable core [2021-10-28 23:49:06,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 23:49:07,713 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 91 proven. 205 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:49:07,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [367576172] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:49:07,714 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 23:49:07,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 35 [2021-10-28 23:49:07,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688876435] [2021-10-28 23:49:07,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-10-28 23:49:07,715 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:49:07,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-10-28 23:49:07,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1098, Unknown=0, NotChecked=0, Total=1260 [2021-10-28 23:49:07,717 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) [2021-10-28 23:49:08,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:49:08,945 INFO L93 Difference]: Finished difference Result 112 states and 115 transitions. [2021-10-28 23:49:08,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-10-28 23:49:08,946 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 [2021-10-28 23:49:08,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:49:08,946 INFO L225 Difference]: With dead ends: 112 [2021-10-28 23:49:08,947 INFO L226 Difference]: Without dead ends: 110 [2021-10-28 23:49:08,947 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=253, Invalid=1909, Unknown=0, NotChecked=0, Total=2162 [2021-10-28 23:49:08,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-10-28 23:49:08,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2021-10-28 23:49:08,949 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) [2021-10-28 23:49:08,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 112 transitions. [2021-10-28 23:49:08,950 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 112 transitions. Word has length 94 [2021-10-28 23:49:08,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:49:08,951 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 112 transitions. [2021-10-28 23:49:08,951 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) [2021-10-28 23:49:08,951 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 112 transitions. [2021-10-28 23:49:08,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-10-28 23:49:08,953 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:49:08,953 INFO L513 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] [2021-10-28 23:49:08,987 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-10-28 23:49:09,177 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-10-28 23:49:09,177 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:49:09,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:49:09,178 INFO L85 PathProgramCache]: Analyzing trace with hash -699918494, now seen corresponding path program 14 times [2021-10-28 23:49:09,178 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:49:09,178 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683717498] [2021-10-28 23:49:09,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:49:09,178 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:49:09,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:49:09,838 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:49:09,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:49:09,842 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 33 proven. 312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:49:09,842 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:49:09,842 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683717498] [2021-10-28 23:49:09,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683717498] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:49:09,842 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1549738087] [2021-10-28 23:49:09,842 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-28 23:49:09,843 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:49:09,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 [2021-10-28 23:49:09,845 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 23:49:09,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-10-28 23:49:10,565 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-28 23:49:10,565 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-28 23:49:10,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 61 conjunts are in the unsatisfiable core [2021-10-28 23:49:10,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 23:49:10,928 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 [2021-10-28 23:49:13,597 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-28 23:49:13,597 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 [2021-10-28 23:49:14,025 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 91 proven. 254 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:49:14,025 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1549738087] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:49:14,025 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 23:49:14,025 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 52 [2021-10-28 23:49:14,026 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633498788] [2021-10-28 23:49:14,026 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-10-28 23:49:14,026 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:49:14,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-10-28 23:49:14,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=2480, Unknown=0, NotChecked=0, Total=2652 [2021-10-28 23:49:14,030 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) [2021-10-28 23:49:22,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:49:22,366 INFO L93 Difference]: Finished difference Result 180 states and 183 transitions. [2021-10-28 23:49:22,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-10-28 23:49:22,367 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 [2021-10-28 23:49:22,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:49:22,369 INFO L225 Difference]: With dead ends: 180 [2021-10-28 23:49:22,369 INFO L226 Difference]: Without dead ends: 123 [2021-10-28 23:49:22,372 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1177 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=508, Invalid=6974, Unknown=0, NotChecked=0, Total=7482 [2021-10-28 23:49:22,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-10-28 23:49:22,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 120. [2021-10-28 23:49:22,376 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) [2021-10-28 23:49:22,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 122 transitions. [2021-10-28 23:49:22,377 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 122 transitions. Word has length 100 [2021-10-28 23:49:22,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:49:22,377 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 122 transitions. [2021-10-28 23:49:22,378 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) [2021-10-28 23:49:22,378 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 122 transitions. [2021-10-28 23:49:22,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-10-28 23:49:22,379 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 23:49:22,380 INFO L513 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] [2021-10-28 23:49:22,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-10-28 23:49:22,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:49:22,605 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 7 more)] === [2021-10-28 23:49:22,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 23:49:22,606 INFO L85 PathProgramCache]: Analyzing trace with hash -76462471, now seen corresponding path program 15 times [2021-10-28 23:49:22,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 23:49:22,606 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386792203] [2021-10-28 23:49:22,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 23:49:22,606 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 23:49:22,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:49:23,369 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 23:49:23,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 23:49:23,374 INFO L134 CoverageAnalysis]: Checked inductivity of 433 backedges. 37 proven. 396 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 23:49:23,374 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 23:49:23,374 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386792203] [2021-10-28 23:49:23,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1386792203] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:49:23,374 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [270511698] [2021-10-28 23:49:23,374 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-28 23:49:23,374 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 23:49:23,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 [2021-10-28 23:49:23,376 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 23:49:23,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-10-28 23:49:24,282 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-10-28 23:49:24,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-28 23:49:24,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 40 conjunts are in the unsatisfiable core [2021-10-28 23:49:24,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 23:49:24,314 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 [2021-10-28 23:49:24,558 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 [2021-10-28 23:49:25,454 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-28 23:49:25,454 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 [2021-10-28 23:49:25,719 INFO L134 CoverageAnalysis]: Checked inductivity of 433 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2021-10-28 23:49:25,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [270511698] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 23:49:25,719 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 23:49:25,720 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 10] total 38 [2021-10-28 23:49:25,720 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548318521] [2021-10-28 23:49:25,720 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-10-28 23:49:25,720 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 23:49:25,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-10-28 23:49:25,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1325, Unknown=0, NotChecked=0, Total=1406 [2021-10-28 23:49:25,722 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) [2021-10-28 23:49:32,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 23:49:32,178 INFO L93 Difference]: Finished difference Result 186 states and 187 transitions. [2021-10-28 23:49:32,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-10-28 23:49:32,179 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 [2021-10-28 23:49:32,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 23:49:32,179 INFO L225 Difference]: With dead ends: 186 [2021-10-28 23:49:32,179 INFO L226 Difference]: Without dead ends: 0 [2021-10-28 23:49:32,183 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1974 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=1001, Invalid=9711, Unknown=0, NotChecked=0, Total=10712 [2021-10-28 23:49:32,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-10-28 23:49:32,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-10-28 23:49:32,183 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) [2021-10-28 23:49:32,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-10-28 23:49:32,183 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 110 [2021-10-28 23:49:32,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 23:49:32,184 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-10-28 23:49:32,184 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) [2021-10-28 23:49:32,184 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-10-28 23:49:32,184 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-10-28 23:49:32,186 INFO L764 garLoopResultBuilder]: Registering result SAFE for location cstrchrErr0REQUIRES_VIOLATION [2021-10-28 23:49:32,187 INFO L764 garLoopResultBuilder]: Registering result SAFE for location cstrchrErr1REQUIRES_VIOLATION [2021-10-28 23:49:32,187 INFO L764 garLoopResultBuilder]: Registering result SAFE for location cstrchrErr2REQUIRES_VIOLATION [2021-10-28 23:49:32,187 INFO L764 garLoopResultBuilder]: Registering result SAFE for location cstrchrErr3REQUIRES_VIOLATION [2021-10-28 23:49:32,187 INFO L764 garLoopResultBuilder]: Registering result SAFE for location cstrchrErr4REQUIRES_VIOLATION [2021-10-28 23:49:32,187 INFO L764 garLoopResultBuilder]: Registering result SAFE for location cstrchrErr5REQUIRES_VIOLATION [2021-10-28 23:49:32,187 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr0REQUIRES_VIOLATION [2021-10-28 23:49:32,187 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr1REQUIRES_VIOLATION [2021-10-28 23:49:32,188 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr2REQUIRES_VIOLATION [2021-10-28 23:49:32,188 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr3REQUIRES_VIOLATION [2021-10-28 23:49:32,188 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr4ENSURES_VIOLATIONMEMORY_LEAK [2021-10-28 23:49:32,216 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-10-28 23:49:32,388 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-10-28 23:49:32,394 INFO L731 BasicCegarLoop]: Path program histogram: [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 23:49:32,396 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-28 23:49:32,399 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.10 11:49:32 BoogieIcfgContainer [2021-10-28 23:49:32,399 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-28 23:49:32,400 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-28 23:49:32,400 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-28 23:49:32,400 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-28 23:49:32,401 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 11:47:48" (3/4) ... [2021-10-28 23:49:32,404 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-10-28 23:49:32,412 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure cstrchr [2021-10-28 23:49:32,412 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2021-10-28 23:49:32,412 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_32 [2021-10-28 23:49:32,413 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_64 [2021-10-28 23:49:32,413 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint16_identity [2021-10-28 23:49:32,413 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint64_identity [2021-10-28 23:49:32,413 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2021-10-28 23:49:32,414 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint32_identity [2021-10-28 23:49:32,419 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 14 nodes and edges [2021-10-28 23:49:32,419 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2021-10-28 23:49:32,419 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-28 23:49:32,420 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-28 23:49:32,467 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/witness.graphml [2021-10-28 23:49:32,467 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-28 23:49:32,468 INFO L168 Benchmark]: Toolchain (without parser) took 105653.49 ms. Allocated memory was 94.4 MB in the beginning and 211.8 MB in the end (delta: 117.4 MB). Free memory was 57.2 MB in the beginning and 128.4 MB in the end (delta: -71.3 MB). Peak memory consumption was 45.3 MB. Max. memory is 16.1 GB. [2021-10-28 23:49:32,469 INFO L168 Benchmark]: CDTParser took 0.32 ms. Allocated memory is still 94.4 MB. Free memory was 66.9 MB in the beginning and 66.9 MB in the end (delta: 31.7 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-28 23:49:32,469 INFO L168 Benchmark]: CACSL2BoogieTranslator took 573.74 ms. Allocated memory was 94.4 MB in the beginning and 121.6 MB in the end (delta: 27.3 MB). Free memory was 57.0 MB in the beginning and 90.7 MB in the end (delta: -33.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-28 23:49:32,469 INFO L168 Benchmark]: Boogie Preprocessor took 59.98 ms. Allocated memory is still 121.6 MB. Free memory was 90.7 MB in the beginning and 88.0 MB in the end (delta: 2.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-28 23:49:32,470 INFO L168 Benchmark]: RCFGBuilder took 612.51 ms. Allocated memory is still 121.6 MB. Free memory was 88.0 MB in the beginning and 69.1 MB in the end (delta: 18.9 MB). Peak memory consumption was 18.9 MB. Max. memory is 16.1 GB. [2021-10-28 23:49:32,470 INFO L168 Benchmark]: TraceAbstraction took 104318.87 ms. Allocated memory was 121.6 MB in the beginning and 211.8 MB in the end (delta: 90.2 MB). Free memory was 68.4 MB in the beginning and 131.6 MB in the end (delta: -63.2 MB). Peak memory consumption was 29.0 MB. Max. memory is 16.1 GB. [2021-10-28 23:49:32,471 INFO L168 Benchmark]: Witness Printer took 67.65 ms. Allocated memory is still 211.8 MB. Free memory was 131.6 MB in the beginning and 128.4 MB in the end (delta: 3.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-10-28 23:49:32,473 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 94.4 MB. Free memory was 66.9 MB in the beginning and 66.9 MB in the end (delta: 31.7 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 573.74 ms. Allocated memory was 94.4 MB in the beginning and 121.6 MB in the end (delta: 27.3 MB). Free memory was 57.0 MB in the beginning and 90.7 MB in the end (delta: -33.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 59.98 ms. Allocated memory is still 121.6 MB. Free memory was 90.7 MB in the beginning and 88.0 MB in the end (delta: 2.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 612.51 ms. Allocated memory is still 121.6 MB. Free memory was 88.0 MB in the beginning and 69.1 MB in the end (delta: 18.9 MB). Peak memory consumption was 18.9 MB. Max. memory is 16.1 GB. * TraceAbstraction took 104318.87 ms. Allocated memory was 121.6 MB in the beginning and 211.8 MB in the end (delta: 90.2 MB). Free memory was 68.4 MB in the beginning and 131.6 MB in the end (delta: -63.2 MB). Peak memory consumption was 29.0 MB. Max. memory is 16.1 GB. * Witness Printer took 67.65 ms. Allocated memory is still 211.8 MB. Free memory was 131.6 MB in the beginning and 128.4 MB in the end (delta: 3.2 MB). Peak memory consumption was 4.2 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, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s 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: 104.2s, OverallIterations: 27, TraceHistogramMax: 10, PathProgramHistogramMax: 15, EmptinessCheckTime: 0.0s, AutomataDifference: 65.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 793 SDtfs, 2952 SDslu, 3579 SDs, 0 SdLazy, 20879 SolverSat, 510 SolverUnsat, 1 SolverUnknown, 0 SolverNotchecked, 17.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1665 GetRequests, 871 SyntacticMatches, 9 SemanticMatches, 785 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6689 ImplicationChecksByTransitivity, 58.7s Time, 0.0s 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, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 27 MinimizatonAttempts, 77 StatesRemovedByMinimization, 15 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 1.2s SatisfiabilityAnalysisTime, 27.8s 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! [2021-10-28 23:49:32,552 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5d5d0886-843c-42e5-9a38-2316cd74b6ba/bin/uautomizer-GMMbpWq8iD/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...