./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrchr_unsafe.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version f8e1c903 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrchr_unsafe.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX --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 10a3b461143c2c5d394f7bd34cd6fefed4195b79a5252178f7ede404a303cf96 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-f8e1c90 [2021-11-09 09:09:02,524 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-09 09:09:02,527 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-09 09:09:02,582 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-09 09:09:02,583 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-09 09:09:02,587 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-09 09:09:02,589 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-09 09:09:02,594 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-09 09:09:02,596 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-09 09:09:02,602 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-09 09:09:02,603 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-09 09:09:02,606 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-09 09:09:02,606 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-09 09:09:02,609 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-09 09:09:02,612 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-09 09:09:02,616 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-09 09:09:02,621 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-09 09:09:02,623 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-09 09:09:02,626 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-09 09:09:02,634 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-09 09:09:02,636 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-09 09:09:02,637 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-09 09:09:02,641 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-09 09:09:02,642 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-09 09:09:02,651 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-09 09:09:02,652 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-09 09:09:02,652 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-09 09:09:02,654 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-09 09:09:02,655 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-09 09:09:02,657 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-09 09:09:02,657 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-09 09:09:02,658 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-09 09:09:02,660 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-09 09:09:02,662 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-09 09:09:02,664 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-09 09:09:02,664 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-09 09:09:02,665 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-09 09:09:02,665 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-09 09:09:02,666 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-09 09:09:02,667 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-09 09:09:02,668 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-09 09:09:02,669 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-11-09 09:09:02,710 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-09 09:09:02,711 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-09 09:09:02,711 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-09 09:09:02,712 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-09 09:09:02,719 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-09 09:09:02,720 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-09 09:09:02,720 INFO L138 SettingsManager]: * Use SBE=true [2021-11-09 09:09:02,720 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-09 09:09:02,721 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-09 09:09:02,721 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-09 09:09:02,722 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-09 09:09:02,722 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-09 09:09:02,723 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-09 09:09:02,723 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-09 09:09:02,723 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-09 09:09:02,723 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-09 09:09:02,723 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-09 09:09:02,724 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-09 09:09:02,724 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-09 09:09:02,724 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-09 09:09:02,724 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-09 09:09:02,725 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-09 09:09:02,725 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-09 09:09:02,725 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-09 09:09:02,725 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-09 09:09:02,726 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-09 09:09:02,726 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-09 09:09:02,726 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-09 09:09:02,726 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-09 09:09:02,728 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_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 10a3b461143c2c5d394f7bd34cd6fefed4195b79a5252178f7ede404a303cf96 [2021-11-09 09:09:03,061 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-09 09:09:03,085 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-09 09:09:03,088 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-09 09:09:03,089 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-09 09:09:03,090 INFO L275 PluginConnector]: CDTParser initialized [2021-11-09 09:09:03,091 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/../../sv-benchmarks/c/array-memsafety/cstrchr_unsafe.i [2021-11-09 09:09:03,166 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/data/ab76bfd3a/15baec0e0248485083ae0a0375da9ea9/FLAGa36df32f3 [2021-11-09 09:09:03,740 INFO L306 CDTParser]: Found 1 translation units. [2021-11-09 09:09:03,740 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/sv-benchmarks/c/array-memsafety/cstrchr_unsafe.i [2021-11-09 09:09:03,763 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/data/ab76bfd3a/15baec0e0248485083ae0a0375da9ea9/FLAGa36df32f3 [2021-11-09 09:09:04,026 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/data/ab76bfd3a/15baec0e0248485083ae0a0375da9ea9 [2021-11-09 09:09:04,030 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-09 09:09:04,032 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-09 09:09:04,036 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-09 09:09:04,036 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-09 09:09:04,039 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-09 09:09:04,040 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 09:09:04" (1/1) ... [2021-11-09 09:09:04,042 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4dd01ac6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:04, skipping insertion in model container [2021-11-09 09:09:04,042 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 09:09:04" (1/1) ... [2021-11-09 09:09:04,050 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-09 09:09:04,102 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-09 09:09:04,468 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-09 09:09:04,482 INFO L203 MainTranslator]: Completed pre-run [2021-11-09 09:09:04,558 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-09 09:09:04,590 INFO L208 MainTranslator]: Completed translation [2021-11-09 09:09:04,591 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:04 WrapperNode [2021-11-09 09:09:04,591 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-09 09:09:04,592 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-09 09:09:04,593 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-09 09:09:04,593 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-09 09:09:04,605 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:04" (1/1) ... [2021-11-09 09:09:04,606 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:04" (1/1) ... [2021-11-09 09:09:04,635 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:04" (1/1) ... [2021-11-09 09:09:04,635 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:04" (1/1) ... [2021-11-09 09:09:04,653 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:04" (1/1) ... [2021-11-09 09:09:04,659 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:04" (1/1) ... [2021-11-09 09:09:04,671 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:04" (1/1) ... [2021-11-09 09:09:04,679 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-09 09:09:04,686 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-09 09:09:04,686 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-09 09:09:04,687 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-09 09:09:04,688 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:04" (1/1) ... [2021-11-09 09:09:04,695 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-09 09:09:04,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:04,728 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-09 09:09:04,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-09 09:09:04,772 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-09 09:09:04,773 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-09 09:09:04,773 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-09 09:09:04,773 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-09 09:09:04,774 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2021-11-09 09:09:04,774 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2021-11-09 09:09:04,774 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2021-11-09 09:09:04,775 INFO L138 BoogieDeclarations]: Found implementation of procedure build_nondet_String [2021-11-09 09:09:04,775 INFO L138 BoogieDeclarations]: Found implementation of procedure cstrchr [2021-11-09 09:09:04,775 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-09 09:09:04,775 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-09 09:09:04,776 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-09 09:09:04,776 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-09 09:09:04,776 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-09 09:09:04,777 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-09 09:09:04,777 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-09 09:09:04,777 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-09 09:09:04,777 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-09 09:09:04,777 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-09 09:09:04,777 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-09 09:09:04,777 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-09 09:09:04,778 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-09 09:09:04,778 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-09 09:09:04,778 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-09 09:09:04,778 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-09 09:09:04,778 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-09 09:09:04,778 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-09 09:09:04,778 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-09 09:09:04,779 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2021-11-09 09:09:04,779 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2021-11-09 09:09:04,779 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2021-11-09 09:09:04,779 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-09 09:09:04,779 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-09 09:09:04,780 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-09 09:09:04,780 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-09 09:09:04,780 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-09 09:09:04,780 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-09 09:09:04,780 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-09 09:09:04,780 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-09 09:09:04,780 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-09 09:09:04,781 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-09 09:09:04,781 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-09 09:09:04,781 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-09 09:09:04,781 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-09 09:09:04,781 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-09 09:09:04,781 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-09 09:09:04,781 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-09 09:09:04,782 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-09 09:09:04,782 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-09 09:09:04,782 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-09 09:09:04,782 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-09 09:09:04,782 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-09 09:09:04,783 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-09 09:09:04,783 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-09 09:09:04,784 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-09 09:09:04,784 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-09 09:09:04,784 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-09 09:09:04,784 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-09 09:09:04,784 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-09 09:09:04,785 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-09 09:09:04,785 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-09 09:09:04,785 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-09 09:09:04,785 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-09 09:09:04,785 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-09 09:09:04,785 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-09 09:09:04,785 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-09 09:09:04,786 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-09 09:09:04,786 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-09 09:09:04,787 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-09 09:09:04,787 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-09 09:09:04,788 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-09 09:09:04,788 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-09 09:09:04,788 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-11-09 09:09:04,789 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-09 09:09:04,789 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-09 09:09:04,789 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-11-09 09:09:04,789 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-09 09:09:04,789 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-09 09:09:04,789 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-11-09 09:09:04,789 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-09 09:09:04,790 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-09 09:09:04,790 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-09 09:09:04,790 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-09 09:09:04,790 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-09 09:09:04,790 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-09 09:09:04,791 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-09 09:09:04,791 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-09 09:09:04,791 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-09 09:09:04,791 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-09 09:09:04,792 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-09 09:09:04,792 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-09 09:09:04,792 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-09 09:09:04,792 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-09 09:09:04,792 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-09 09:09:04,792 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-09 09:09:04,792 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-09 09:09:04,793 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-09 09:09:04,793 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-09 09:09:04,793 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-09 09:09:04,793 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-09 09:09:04,793 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-09 09:09:04,793 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-09 09:09:04,793 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-09 09:09:04,793 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-09 09:09:04,794 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-09 09:09:04,794 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-09 09:09:04,794 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-09 09:09:04,794 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-09 09:09:04,794 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-09 09:09:04,795 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-09 09:09:04,795 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-09 09:09:04,795 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-09 09:09:04,795 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-09 09:09:04,796 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-09 09:09:04,796 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-09 09:09:04,796 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-09 09:09:04,796 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-09 09:09:04,796 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-11-09 09:09:04,797 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2021-11-09 09:09:04,797 INFO L130 BoogieDeclarations]: Found specification of procedure build_nondet_String [2021-11-09 09:09:04,797 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-09 09:09:04,797 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-09 09:09:04,797 INFO L130 BoogieDeclarations]: Found specification of procedure cstrchr [2021-11-09 09:09:04,797 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-09 09:09:04,797 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-09 09:09:04,798 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-09 09:09:04,798 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-09 09:09:04,798 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-09 09:09:05,337 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-09 09:09:05,338 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-09 09:09:05,341 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 09:09:05 BoogieIcfgContainer [2021-11-09 09:09:05,342 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-09 09:09:05,344 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-09 09:09:05,344 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-09 09:09:05,348 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-09 09:09:05,348 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.11 09:09:04" (1/3) ... [2021-11-09 09:09:05,349 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d7b2e13 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 09:09:05, skipping insertion in model container [2021-11-09 09:09:05,349 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:09:04" (2/3) ... [2021-11-09 09:09:05,349 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d7b2e13 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 09:09:05, skipping insertion in model container [2021-11-09 09:09:05,350 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 09:09:05" (3/3) ... [2021-11-09 09:09:05,351 INFO L111 eAbstractionObserver]: Analyzing ICFG cstrchr_unsafe.i [2021-11-09 09:09:05,357 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-09 09:09:05,357 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 16 error locations. [2021-11-09 09:09:05,403 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-09 09:09:05,409 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 [2021-11-09 09:09:05,409 INFO L340 AbstractCegarLoop]: Starting to check reachability of 16 error locations. [2021-11-09 09:09:05,425 INFO L276 IsEmpty]: Start isEmpty. Operand has 56 states, 31 states have (on average 1.7419354838709677) internal successors, (54), 47 states have internal predecessors, (54), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-09 09:09:05,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-09 09:09:05,433 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:05,433 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:05,434 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting build_nondet_StringErr2REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-11-09 09:09:05,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:05,439 INFO L85 PathProgramCache]: Analyzing trace with hash 1524183926, now seen corresponding path program 1 times [2021-11-09 09:09:05,448 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:05,449 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583458076] [2021-11-09 09:09:05,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:05,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:05,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:05,650 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:09:05,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:05,677 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:05,678 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:05,678 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583458076] [2021-11-09 09:09:05,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1583458076] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:09:05,679 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:09:05,680 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-09 09:09:05,681 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190971047] [2021-11-09 09:09:05,690 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-09 09:09:05,690 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:05,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-09 09:09:05,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-09 09:09:05,710 INFO L87 Difference]: Start difference. First operand has 56 states, 31 states have (on average 1.7419354838709677) internal successors, (54), 47 states have internal predecessors, (54), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) 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, (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) [2021-11-09 09:09:05,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:05,849 INFO L93 Difference]: Finished difference Result 56 states and 60 transitions. [2021-11-09 09:09:05,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-09 09:09:05,851 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, (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 11 [2021-11-09 09:09:05,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:05,859 INFO L225 Difference]: With dead ends: 56 [2021-11-09 09:09:05,859 INFO L226 Difference]: Without dead ends: 53 [2021-11-09 09:09:05,860 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 [2021-11-09 09:09:05,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-09 09:09:05,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-11-09 09:09:05,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 30 states have (on average 1.6666666666666667) internal successors, (50), 45 states have internal predecessors, (50), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-09 09:09:05,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2021-11-09 09:09:05,894 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 11 [2021-11-09 09:09:05,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:05,894 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2021-11-09 09:09:05,895 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, (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) [2021-11-09 09:09:05,895 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2021-11-09 09:09:05,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-09 09:09:05,895 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:05,896 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:05,896 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-09 09:09:05,896 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting build_nondet_StringErr2REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-11-09 09:09:05,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:05,897 INFO L85 PathProgramCache]: Analyzing trace with hash 1524183616, now seen corresponding path program 1 times [2021-11-09 09:09:05,897 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:05,897 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [581268505] [2021-11-09 09:09:05,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:05,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:05,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:05,957 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:09:05,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:05,973 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:05,973 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:05,973 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [581268505] [2021-11-09 09:09:05,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [581268505] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:09:05,974 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:09:05,974 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-09 09:09:05,974 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905120293] [2021-11-09 09:09:05,975 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-09 09:09:05,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:05,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-09 09:09:05,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-09 09:09:05,977 INFO L87 Difference]: Start difference. First operand 53 states and 57 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, (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) [2021-11-09 09:09:06,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:06,121 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-11-09 09:09:06,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-09 09:09:06,122 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, (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 11 [2021-11-09 09:09:06,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:06,124 INFO L225 Difference]: With dead ends: 51 [2021-11-09 09:09:06,125 INFO L226 Difference]: Without dead ends: 51 [2021-11-09 09:09:06,126 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 [2021-11-09 09:09:06,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-09 09:09:06,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-11-09 09:09:06,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 30 states have (on average 1.6) internal successors, (48), 43 states have internal predecessors, (48), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-09 09:09:06,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2021-11-09 09:09:06,145 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 11 [2021-11-09 09:09:06,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:06,145 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2021-11-09 09:09:06,145 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, (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) [2021-11-09 09:09:06,146 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2021-11-09 09:09:06,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-09 09:09:06,146 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:06,147 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:06,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-09 09:09:06,147 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting build_nondet_StringErr3REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-11-09 09:09:06,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:06,148 INFO L85 PathProgramCache]: Analyzing trace with hash 1524183617, now seen corresponding path program 1 times [2021-11-09 09:09:06,149 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:06,149 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [463332928] [2021-11-09 09:09:06,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:06,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:06,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:06,275 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:09:06,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:06,282 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:06,282 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:06,283 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [463332928] [2021-11-09 09:09:06,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [463332928] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:09:06,283 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:09:06,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-09 09:09:06,284 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584474824] [2021-11-09 09:09:06,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-09 09:09:06,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:06,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-09 09:09:06,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-09 09:09:06,285 INFO L87 Difference]: Start difference. First operand 51 states and 55 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, (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) [2021-11-09 09:09:06,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:06,414 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2021-11-09 09:09:06,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-09 09:09:06,414 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, (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 11 [2021-11-09 09:09:06,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:06,417 INFO L225 Difference]: With dead ends: 50 [2021-11-09 09:09:06,417 INFO L226 Difference]: Without dead ends: 50 [2021-11-09 09:09:06,419 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 [2021-11-09 09:09:06,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-09 09:09:06,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-09 09:09:06,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 30 states have (on average 1.5666666666666667) internal successors, (47), 42 states have internal predecessors, (47), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-09 09:09:06,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2021-11-09 09:09:06,439 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 11 [2021-11-09 09:09:06,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:06,440 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2021-11-09 09:09:06,440 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, (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) [2021-11-09 09:09:06,440 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2021-11-09 09:09:06,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-09 09:09:06,441 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:06,441 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:06,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-09 09:09:06,441 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting build_nondet_StringErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-11-09 09:09:06,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:06,443 INFO L85 PathProgramCache]: Analyzing trace with hash 1524183670, now seen corresponding path program 1 times [2021-11-09 09:09:06,443 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:06,443 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [587801869] [2021-11-09 09:09:06,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:06,443 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:06,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:06,524 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:09:06,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:06,534 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:06,534 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:06,534 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [587801869] [2021-11-09 09:09:06,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [587801869] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:09:06,535 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:09:06,535 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-09 09:09:06,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313112916] [2021-11-09 09:09:06,535 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-09 09:09:06,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:06,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-09 09:09:06,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-09 09:09:06,537 INFO L87 Difference]: Start difference. First operand 50 states and 54 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, (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) [2021-11-09 09:09:06,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:06,639 INFO L93 Difference]: Finished difference Result 56 states and 60 transitions. [2021-11-09 09:09:06,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-09 09:09:06,640 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, (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 11 [2021-11-09 09:09:06,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:06,643 INFO L225 Difference]: With dead ends: 56 [2021-11-09 09:09:06,643 INFO L226 Difference]: Without dead ends: 56 [2021-11-09 09:09:06,644 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 [2021-11-09 09:09:06,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-09 09:09:06,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 52. [2021-11-09 09:09:06,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 32 states have (on average 1.53125) internal successors, (49), 44 states have internal predecessors, (49), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-09 09:09:06,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2021-11-09 09:09:06,665 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 11 [2021-11-09 09:09:06,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:06,665 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2021-11-09 09:09:06,666 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, (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) [2021-11-09 09:09:06,666 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2021-11-09 09:09:06,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-09 09:09:06,666 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:06,666 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:06,667 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-09 09:09:06,667 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting build_nondet_StringErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-11-09 09:09:06,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:06,667 INFO L85 PathProgramCache]: Analyzing trace with hash 1524243252, now seen corresponding path program 1 times [2021-11-09 09:09:06,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:06,668 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [921852197] [2021-11-09 09:09:06,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:06,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:06,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:06,772 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:09:06,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:06,787 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:06,788 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:06,789 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [921852197] [2021-11-09 09:09:06,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [921852197] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:09:06,789 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:09:06,789 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-09 09:09:06,790 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068236442] [2021-11-09 09:09:06,790 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-09 09:09:06,790 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:06,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-09 09:09:06,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-09 09:09:06,792 INFO L87 Difference]: Start difference. First operand 52 states and 56 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, (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) [2021-11-09 09:09:06,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:06,963 INFO L93 Difference]: Finished difference Result 60 states and 65 transitions. [2021-11-09 09:09:06,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-09 09:09:06,964 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, (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 11 [2021-11-09 09:09:06,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:06,965 INFO L225 Difference]: With dead ends: 60 [2021-11-09 09:09:06,966 INFO L226 Difference]: Without dead ends: 60 [2021-11-09 09:09:06,966 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-09 09:09:06,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-09 09:09:06,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2021-11-09 09:09:06,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 46 states have internal predecessors, (52), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-09 09:09:06,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2021-11-09 09:09:06,971 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 11 [2021-11-09 09:09:06,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:06,972 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2021-11-09 09:09:06,972 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, (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) [2021-11-09 09:09:06,972 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2021-11-09 09:09:06,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-09 09:09:06,973 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:06,973 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:06,973 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-09 09:09:06,974 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting build_nondet_StringErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-11-09 09:09:06,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:06,974 INFO L85 PathProgramCache]: Analyzing trace with hash -583933833, now seen corresponding path program 1 times [2021-11-09 09:09:06,974 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:06,975 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1168031228] [2021-11-09 09:09:06,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:06,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:06,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:07,064 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:09:07,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:07,069 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:07,070 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:07,070 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1168031228] [2021-11-09 09:09:07,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1168031228] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:07,070 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [609590287] [2021-11-09 09:09:07,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:07,071 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:07,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:09:07,073 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:09:07,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-09 09:09:07,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:07,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-09 09:09:07,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:09:07,384 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 [2021-11-09 09:09:07,553 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:07,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [609590287] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:09:07,556 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:09:07,556 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-11-09 09:09:07,557 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13282035] [2021-11-09 09:09:07,557 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-09 09:09:07,557 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:07,558 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-09 09:09:07,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-09 09:09:07,560 INFO L87 Difference]: Start difference. First operand 54 states and 59 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-09 09:09:07,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:07,751 INFO L93 Difference]: Finished difference Result 59 states and 64 transitions. [2021-11-09 09:09:07,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-09 09:09:07,752 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, (4), 2 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 15 [2021-11-09 09:09:07,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:07,753 INFO L225 Difference]: With dead ends: 59 [2021-11-09 09:09:07,754 INFO L226 Difference]: Without dead ends: 59 [2021-11-09 09:09:07,756 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-09 09:09:07,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-09 09:09:07,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2021-11-09 09:09:07,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 32 states have (on average 1.5) internal successors, (48), 43 states have internal predecessors, (48), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-09 09:09:07,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2021-11-09 09:09:07,766 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 15 [2021-11-09 09:09:07,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:07,766 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2021-11-09 09:09:07,766 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-09 09:09:07,767 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2021-11-09 09:09:07,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-09 09:09:07,768 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:07,768 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:07,806 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-09 09:09:07,981 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:09:07,981 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting cstrchrErr0REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-11-09 09:09:07,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:07,982 INFO L85 PathProgramCache]: Analyzing trace with hash -269979680, now seen corresponding path program 1 times [2021-11-09 09:09:07,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:07,982 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1275679056] [2021-11-09 09:09:07,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:07,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:07,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:08,048 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:09:08,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:08,066 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-11-09 09:09:08,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:08,124 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:08,124 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:08,124 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1275679056] [2021-11-09 09:09:08,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1275679056] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:09:08,125 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:09:08,125 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-09 09:09:08,125 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119228071] [2021-11-09 09:09:08,126 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-09 09:09:08,126 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:08,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-09 09:09:08,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-11-09 09:09:08,127 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand has 10 states, 8 states have (on average 1.5) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-09 09:09:08,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:08,351 INFO L93 Difference]: Finished difference Result 47 states and 51 transitions. [2021-11-09 09:09:08,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-09 09:09:08,351 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 1.5) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-11-09 09:09:08,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:08,354 INFO L225 Difference]: With dead ends: 47 [2021-11-09 09:09:08,354 INFO L226 Difference]: Without dead ends: 47 [2021-11-09 09:09:08,355 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-11-09 09:09:08,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-09 09:09:08,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-11-09 09:09:08,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 32 states have (on average 1.375) internal successors, (44), 39 states have internal predecessors, (44), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-09 09:09:08,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2021-11-09 09:09:08,363 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 18 [2021-11-09 09:09:08,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:08,364 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2021-11-09 09:09:08,364 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 1.5) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-09 09:09:08,364 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2021-11-09 09:09:08,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-09 09:09:08,365 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:08,366 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:08,366 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-09 09:09:08,366 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-11-09 09:09:08,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:08,368 INFO L85 PathProgramCache]: Analyzing trace with hash -269979679, now seen corresponding path program 1 times [2021-11-09 09:09:08,368 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:08,368 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325257674] [2021-11-09 09:09:08,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:08,369 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:08,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:08,509 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:09:08,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:08,534 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-11-09 09:09:08,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:08,664 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:08,664 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:08,664 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1325257674] [2021-11-09 09:09:08,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1325257674] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:09:08,665 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:09:08,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-09 09:09:08,665 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702431375] [2021-11-09 09:09:08,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-09 09:09:08,666 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:08,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-09 09:09:08,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-11-09 09:09:08,668 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand has 12 states, 10 states have (on average 1.2) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-09 09:09:09,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:09,011 INFO L93 Difference]: Finished difference Result 57 states and 64 transitions. [2021-11-09 09:09:09,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-09 09:09:09,012 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 1.2) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-11-09 09:09:09,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:09,013 INFO L225 Difference]: With dead ends: 57 [2021-11-09 09:09:09,013 INFO L226 Difference]: Without dead ends: 57 [2021-11-09 09:09:09,014 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-11-09 09:09:09,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-09 09:09:09,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 53. [2021-11-09 09:09:09,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 39 states have (on average 1.3333333333333333) internal successors, (52), 45 states have internal predecessors, (52), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-09 09:09:09,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 59 transitions. [2021-11-09 09:09:09,018 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 59 transitions. Word has length 18 [2021-11-09 09:09:09,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:09,018 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 59 transitions. [2021-11-09 09:09:09,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 1.2) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-09 09:09:09,019 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 59 transitions. [2021-11-09 09:09:09,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-09 09:09:09,019 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:09,020 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] [2021-11-09 09:09:09,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-09 09:09:09,020 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-11-09 09:09:09,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:09,020 INFO L85 PathProgramCache]: Analyzing trace with hash -463192456, now seen corresponding path program 1 times [2021-11-09 09:09:09,021 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:09,021 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559321838] [2021-11-09 09:09:09,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:09,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:09,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:09,051 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:09:09,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:09,062 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-11-09 09:09:09,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:09,069 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:09,069 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:09,070 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559321838] [2021-11-09 09:09:09,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1559321838] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:09:09,070 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:09:09,070 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-09 09:09:09,071 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289534824] [2021-11-09 09:09:09,071 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-09 09:09:09,071 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:09,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-09 09:09:09,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-09 09:09:09,073 INFO L87 Difference]: Start difference. First operand 53 states and 59 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 3 states have internal predecessors, (16), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-09 09:09:09,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:09,167 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2021-11-09 09:09:09,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-09 09:09:09,168 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 3 states have internal predecessors, (16), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 22 [2021-11-09 09:09:09,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:09,169 INFO L225 Difference]: With dead ends: 55 [2021-11-09 09:09:09,169 INFO L226 Difference]: Without dead ends: 55 [2021-11-09 09:09:09,169 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-09 09:09:09,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-09 09:09:09,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-11-09 09:09:09,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 41 states have (on average 1.3170731707317074) internal successors, (54), 47 states have internal predecessors, (54), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-09 09:09:09,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 61 transitions. [2021-11-09 09:09:09,173 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 61 transitions. Word has length 22 [2021-11-09 09:09:09,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:09,174 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 61 transitions. [2021-11-09 09:09:09,174 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 3 states have internal predecessors, (16), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-09 09:09:09,174 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 61 transitions. [2021-11-09 09:09:09,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-09 09:09:09,175 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:09,175 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] [2021-11-09 09:09:09,176 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-09 09:09:09,176 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-11-09 09:09:09,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:09,176 INFO L85 PathProgramCache]: Analyzing trace with hash 1542788213, now seen corresponding path program 1 times [2021-11-09 09:09:09,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:09,177 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [584656793] [2021-11-09 09:09:09,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:09,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:09,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:09,257 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:09:09,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:09,275 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-11-09 09:09:09,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:09,361 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:09,362 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:09,362 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [584656793] [2021-11-09 09:09:09,364 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [584656793] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:09:09,367 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:09:09,368 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-09 09:09:09,368 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130808942] [2021-11-09 09:09:09,368 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-09 09:09:09,369 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:09,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-09 09:09:09,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2021-11-09 09:09:09,370 INFO L87 Difference]: Start difference. First operand 55 states and 61 transitions. Second operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-09 09:09:09,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:09,791 INFO L93 Difference]: Finished difference Result 81 states and 87 transitions. [2021-11-09 09:09:09,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-09 09:09:09,791 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2021-11-09 09:09:09,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:09,792 INFO L225 Difference]: With dead ends: 81 [2021-11-09 09:09:09,793 INFO L226 Difference]: Without dead ends: 81 [2021-11-09 09:09:09,793 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=415, Unknown=0, NotChecked=0, Total=506 [2021-11-09 09:09:09,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-09 09:09:09,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 71. [2021-11-09 09:09:09,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 54 states have (on average 1.2592592592592593) internal successors, (68), 61 states have internal predecessors, (68), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-09 09:09:09,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 78 transitions. [2021-11-09 09:09:09,801 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 78 transitions. Word has length 24 [2021-11-09 09:09:09,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:09,802 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 78 transitions. [2021-11-09 09:09:09,802 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-09 09:09:09,802 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 78 transitions. [2021-11-09 09:09:09,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-09 09:09:09,806 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:09,806 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] [2021-11-09 09:09:09,806 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-09 09:09:09,806 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-11-09 09:09:09,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:09,807 INFO L85 PathProgramCache]: Analyzing trace with hash -45559689, now seen corresponding path program 1 times [2021-11-09 09:09:09,807 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:09,807 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1468627522] [2021-11-09 09:09:09,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:09,807 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:09,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:09,901 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:09:09,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:09,949 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-11-09 09:09:09,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:10,083 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:10,084 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:10,084 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1468627522] [2021-11-09 09:09:10,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1468627522] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:09:10,084 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:09:10,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-11-09 09:09:10,084 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285801591] [2021-11-09 09:09:10,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-09 09:09:10,085 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:10,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-09 09:09:10,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2021-11-09 09:09:10,086 INFO L87 Difference]: Start difference. First operand 71 states and 78 transitions. Second operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 11 states have internal predecessors, (18), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-09 09:09:10,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:10,581 INFO L93 Difference]: Finished difference Result 101 states and 109 transitions. [2021-11-09 09:09:10,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-09 09:09:10,582 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 11 states have internal predecessors, (18), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2021-11-09 09:09:10,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:10,583 INFO L225 Difference]: With dead ends: 101 [2021-11-09 09:09:10,583 INFO L226 Difference]: Without dead ends: 101 [2021-11-09 09:09:10,584 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2021-11-09 09:09:10,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-09 09:09:10,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 72. [2021-11-09 09:09:10,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 55 states have (on average 1.2727272727272727) internal successors, (70), 62 states have internal predecessors, (70), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-09 09:09:10,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 80 transitions. [2021-11-09 09:09:10,589 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 80 transitions. Word has length 24 [2021-11-09 09:09:10,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:10,590 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 80 transitions. [2021-11-09 09:09:10,590 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 11 states have internal predecessors, (18), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-09 09:09:10,590 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 80 transitions. [2021-11-09 09:09:10,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-09 09:09:10,591 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:10,592 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, 1, 1, 1] [2021-11-09 09:09:10,592 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-09 09:09:10,592 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting mainErr0REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-11-09 09:09:10,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:10,593 INFO L85 PathProgramCache]: Analyzing trace with hash -1919056224, now seen corresponding path program 1 times [2021-11-09 09:09:10,593 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:10,593 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1224512362] [2021-11-09 09:09:10,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:10,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:10,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:10,630 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:09:10,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:10,643 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-11-09 09:09:10,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:10,674 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-09 09:09:10,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:10,710 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:10,710 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:10,711 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1224512362] [2021-11-09 09:09:10,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1224512362] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:09:10,711 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:09:10,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-09 09:09:10,712 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471083423] [2021-11-09 09:09:10,712 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-09 09:09:10,712 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:10,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-09 09:09:10,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-11-09 09:09:10,713 INFO L87 Difference]: Start difference. First operand 72 states and 80 transitions. Second operand has 12 states, 10 states have (on average 2.0) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-09 09:09:10,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:10,986 INFO L93 Difference]: Finished difference Result 80 states and 88 transitions. [2021-11-09 09:09:10,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-09 09:09:10,987 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 2.0) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2021-11-09 09:09:10,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:10,988 INFO L225 Difference]: With dead ends: 80 [2021-11-09 09:09:10,988 INFO L226 Difference]: Without dead ends: 80 [2021-11-09 09:09:10,989 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-11-09 09:09:10,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-09 09:09:10,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2021-11-09 09:09:10,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 60 states have (on average 1.2666666666666666) internal successors, (76), 68 states have internal predecessors, (76), 5 states have call successors, (5), 5 states have call predecessors, (5), 7 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-09 09:09:10,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 88 transitions. [2021-11-09 09:09:10,999 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 88 transitions. Word has length 27 [2021-11-09 09:09:10,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:10,999 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 88 transitions. [2021-11-09 09:09:11,000 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 2.0) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-09 09:09:11,000 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 88 transitions. [2021-11-09 09:09:11,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-09 09:09:11,001 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:11,001 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, 1, 1, 1] [2021-11-09 09:09:11,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-09 09:09:11,002 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting mainErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-11-09 09:09:11,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:11,002 INFO L85 PathProgramCache]: Analyzing trace with hash -1919056223, now seen corresponding path program 1 times [2021-11-09 09:09:11,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:11,002 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748351964] [2021-11-09 09:09:11,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:11,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:11,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:11,044 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:09:11,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:11,056 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-11-09 09:09:11,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:11,094 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-09 09:09:11,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:09:11,237 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:09:11,238 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:09:11,238 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748351964] [2021-11-09 09:09:11,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1748351964] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:09:11,238 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:09:11,238 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-09 09:09:11,239 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271259913] [2021-11-09 09:09:11,239 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-09 09:09:11,239 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:09:11,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-09 09:09:11,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-11-09 09:09:11,242 INFO L87 Difference]: Start difference. First operand 79 states and 88 transitions. Second operand has 13 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-09 09:09:11,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:09:11,597 INFO L93 Difference]: Finished difference Result 88 states and 98 transitions. [2021-11-09 09:09:11,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-09 09:09:11,598 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2021-11-09 09:09:11,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:09:11,599 INFO L225 Difference]: With dead ends: 88 [2021-11-09 09:09:11,599 INFO L226 Difference]: Without dead ends: 88 [2021-11-09 09:09:11,599 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2021-11-09 09:09:11,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-09 09:09:11,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2021-11-09 09:09:11,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 64 states have (on average 1.265625) internal successors, (81), 72 states have internal predecessors, (81), 5 states have call successors, (5), 5 states have call predecessors, (5), 8 states have return successors, (8), 6 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-09 09:09:11,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 94 transitions. [2021-11-09 09:09:11,604 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 94 transitions. Word has length 27 [2021-11-09 09:09:11,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:09:11,605 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 94 transitions. [2021-11-09 09:09:11,605 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-09 09:09:11,605 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 94 transitions. [2021-11-09 09:09:11,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-09 09:09:11,606 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:09:11,606 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, 1, 1, 1] [2021-11-09 09:09:11,606 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-09 09:09:11,606 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting mainErr0REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-11-09 09:09:11,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:09:11,607 INFO L85 PathProgramCache]: Analyzing trace with hash -1917209182, now seen corresponding path program 1 times [2021-11-09 09:09:11,607 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:09:11,607 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1334656097] [2021-11-09 09:09:11,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:09:11,607 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:09:11,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-09 09:09:11,622 INFO L355 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-09 09:09:11,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-09 09:09:11,654 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-11-09 09:09:11,654 INFO L627 BasicCegarLoop]: Counterexample is feasible [2021-11-09 09:09:11,655 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location mainErr0REQUIRES_VIOLATION [2021-11-09 09:09:11,657 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location cstrchrErr0REQUIRES_VIOLATION [2021-11-09 09:09:11,657 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location cstrchrErr1REQUIRES_VIOLATION [2021-11-09 09:09:11,657 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location cstrchrErr2REQUIRES_VIOLATION [2021-11-09 09:09:11,658 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location cstrchrErr3REQUIRES_VIOLATION [2021-11-09 09:09:11,658 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location cstrchrErr4REQUIRES_VIOLATION [2021-11-09 09:09:11,658 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location cstrchrErr5REQUIRES_VIOLATION [2021-11-09 09:09:11,658 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location build_nondet_StringErr0REQUIRES_VIOLATION [2021-11-09 09:09:11,658 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location build_nondet_StringErr1REQUIRES_VIOLATION [2021-11-09 09:09:11,658 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location build_nondet_StringErr2REQUIRES_VIOLATION [2021-11-09 09:09:11,659 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location build_nondet_StringErr3REQUIRES_VIOLATION [2021-11-09 09:09:11,659 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr1REQUIRES_VIOLATION [2021-11-09 09:09:11,659 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr2ASSERT_VIOLATIONMEMORY_FREE [2021-11-09 09:09:11,659 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr3ASSERT_VIOLATIONMEMORY_FREE [2021-11-09 09:09:11,659 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr4ASSERT_VIOLATIONMEMORY_FREE [2021-11-09 09:09:11,659 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr5ENSURES_VIOLATIONMEMORY_LEAK [2021-11-09 09:09:11,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-09 09:09:11,663 INFO L731 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:09:11,666 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-09 09:09:11,690 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.11 09:09:11 BoogieIcfgContainer [2021-11-09 09:09:11,691 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-09 09:09:11,691 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-09 09:09:11,691 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-09 09:09:11,691 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-09 09:09:11,692 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 09:09:05" (3/4) ... [2021-11-09 09:09:11,694 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-11-09 09:09:11,728 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/witness.graphml [2021-11-09 09:09:11,728 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-09 09:09:11,730 INFO L168 Benchmark]: Toolchain (without parser) took 7697.35 ms. Allocated memory was 113.2 MB in the beginning and 144.7 MB in the end (delta: 31.5 MB). Free memory was 71.4 MB in the beginning and 84.6 MB in the end (delta: -13.2 MB). Peak memory consumption was 18.2 MB. Max. memory is 16.1 GB. [2021-11-09 09:09:11,730 INFO L168 Benchmark]: CDTParser took 0.34 ms. Allocated memory is still 113.2 MB. Free memory is still 88.7 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-09 09:09:11,731 INFO L168 Benchmark]: CACSL2BoogieTranslator took 556.07 ms. Allocated memory is still 113.2 MB. Free memory was 71.2 MB in the beginning and 80.7 MB in the end (delta: -9.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-11-09 09:09:11,731 INFO L168 Benchmark]: Boogie Preprocessor took 92.78 ms. Allocated memory is still 113.2 MB. Free memory was 80.7 MB in the beginning and 78.1 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-09 09:09:11,731 INFO L168 Benchmark]: RCFGBuilder took 655.92 ms. Allocated memory is still 113.2 MB. Free memory was 78.1 MB in the beginning and 58.3 MB in the end (delta: 19.9 MB). Peak memory consumption was 21.0 MB. Max. memory is 16.1 GB. [2021-11-09 09:09:11,732 INFO L168 Benchmark]: TraceAbstraction took 6346.54 ms. Allocated memory was 113.2 MB in the beginning and 144.7 MB in the end (delta: 31.5 MB). Free memory was 57.9 MB in the beginning and 86.7 MB in the end (delta: -28.7 MB). Peak memory consumption was 3.4 MB. Max. memory is 16.1 GB. [2021-11-09 09:09:11,732 INFO L168 Benchmark]: Witness Printer took 37.28 ms. Allocated memory is still 144.7 MB. Free memory was 86.7 MB in the beginning and 84.6 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-09 09:09:11,734 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.34 ms. Allocated memory is still 113.2 MB. Free memory is still 88.7 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 556.07 ms. Allocated memory is still 113.2 MB. Free memory was 71.2 MB in the beginning and 80.7 MB in the end (delta: -9.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 92.78 ms. Allocated memory is still 113.2 MB. Free memory was 80.7 MB in the beginning and 78.1 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 655.92 ms. Allocated memory is still 113.2 MB. Free memory was 78.1 MB in the beginning and 58.3 MB in the end (delta: 19.9 MB). Peak memory consumption was 21.0 MB. Max. memory is 16.1 GB. * TraceAbstraction took 6346.54 ms. Allocated memory was 113.2 MB in the beginning and 144.7 MB in the end (delta: 31.5 MB). Free memory was 57.9 MB in the beginning and 86.7 MB in the end (delta: -28.7 MB). Peak memory consumption was 3.4 MB. Max. memory is 16.1 GB. * Witness Printer took 37.28 ms. Allocated memory is still 144.7 MB. Free memory was 86.7 MB in the beginning and 84.6 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 537]: pointer dereference may fail pointer dereference may fail We found a FailurePath: [L536] CALL, EXPR build_nondet_String() [L515] int length = __VERIFIER_nondet_int(); [L516] COND TRUE length < 1 [L517] length = 1 VAL [length=1] [L519] char* nondetString = (char*) malloc(length * sizeof(char)); [L521] int i = 0; VAL [i=0, length=1, nondetString={-1:0}] [L521] COND FALSE !(i < length - 1) VAL [i=0, length=1, nondetString={-1:0}] [L526] nondetString[length-1] = '\0' VAL [i=0, length=1, nondetString={-1:0}] [L527] return nondetString; VAL [\result={-1:0}, i=0, length=1, nondetString={-1:0}] [L536] RET, EXPR build_nondet_String() VAL [build_nondet_String()={-1:0}] [L536] char* s = build_nondet_String(); [L537] CALL cstrchr(s,__VERIFIER_nondet_int()) VAL [\old(c)=2, s={-1:0}] [L531] EXPR \read(*s) VAL [\old(c)=2, \read(*s)=0, c=2, s={-1:0}, s={-1:0}] [L531] *s != '\0' && *s != (char)c VAL [*s != '\0' && *s != (char)c=0, \old(c)=2, \read(*s)=0, c=2, s={-1:0}, s={-1:0}] [L531] COND FALSE !(*s != '\0' && *s != (char)c) [L533] EXPR \read(*s) VAL [\old(c)=2, \read(*s)=0, c=2, s={-1:0}, s={-1:0}] [L533] EXPR (*s == c) ? (char *) s : 0 VAL [(*s == c) ? (char *) s : 0={0:0}, \old(c)=2, \read(*s)=0, c=2, s={-1:0}, s={-1:0}] [L533] return ( (*s == c) ? (char *) s : 0 ); [L537] RET cstrchr(s,__VERIFIER_nondet_int()) VAL [__VERIFIER_nondet_int()=2, cstrchr(s,__VERIFIER_nondet_int())={0:0}, s={-1:0}] - UnprovableResult [Line: 531]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 531]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 531]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 531]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 533]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 533]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 523]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 523]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 526]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 526]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 537]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 538]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 538]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 538]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 535]: Unable to prove that all allocated memory was freed Unable to prove that all allocated memory was freed Reason: Not analyzed. - StatisticsResult: Ultimate Automizer benchmark data CFG has 10 procedures, 71 locations, 16 error locations. Started 1 CEGAR loops. OverallTime: 6.2s, OverallIterations: 14, TraceHistogramMax: 2, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 3.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 456 SDtfs, 828 SDslu, 870 SDs, 0 SdLazy, 2584 SolverSat, 122 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 193 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 1.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=84occurred in iteration=13, InterpolantAutomatonStates: 104, 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, 13 MinimizatonAttempts, 66 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 2.0s InterpolantComputationTime, 272 NumberOfCodeBlocks, 272 NumberOfCodeBlocksAsserted, 15 NumberOfCheckSat, 231 ConstructedInterpolants, 0 QuantifiedInterpolants, 1102 SizeOfPredicates, 1 NumberOfNonLiveVariables, 65 ConjunctsInSsa, 7 ConjunctsInUnsatCore, 14 InterpolantComputations, 12 PerfectInterpolantSequences, 4/7 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 RESULT: Ultimate proved your program to be incorrect! [2021-11-09 09:09:11,769 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d1c84ebb-8f36-461f-8e0b-bdc9df93508c/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(valid-deref)