./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/substring-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/substring-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU --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 4cb6276eff0c60579b1d5f7034948eb4f53891709ff48cdd11b3329ec3c4cc2e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-02 22:25:17,940 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-02 22:25:17,943 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-02 22:25:18,008 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-02 22:25:18,009 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-02 22:25:18,016 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-02 22:25:18,020 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-02 22:25:18,026 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-02 22:25:18,030 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-02 22:25:18,039 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-02 22:25:18,040 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-02 22:25:18,043 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-02 22:25:18,044 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-02 22:25:18,048 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-02 22:25:18,051 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-02 22:25:18,054 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-02 22:25:18,057 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-02 22:25:18,059 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-02 22:25:18,065 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-02 22:25:18,076 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-02 22:25:18,079 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-02 22:25:18,081 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-02 22:25:18,085 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-02 22:25:18,086 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-02 22:25:18,098 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-02 22:25:18,099 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-02 22:25:18,099 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-02 22:25:18,102 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-02 22:25:18,103 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-02 22:25:18,105 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-02 22:25:18,106 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-02 22:25:18,107 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-02 22:25:18,110 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-02 22:25:18,112 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-02 22:25:18,114 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-02 22:25:18,115 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-02 22:25:18,116 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-02 22:25:18,116 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-02 22:25:18,117 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-02 22:25:18,118 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-02 22:25:18,119 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-02 22:25:18,121 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-11-02 22:25:18,156 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-02 22:25:18,156 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-02 22:25:18,157 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-02 22:25:18,157 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-02 22:25:18,167 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-02 22:25:18,167 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-02 22:25:18,167 INFO L138 SettingsManager]: * Use SBE=true [2021-11-02 22:25:18,168 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-02 22:25:18,168 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-02 22:25:18,168 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-02 22:25:18,168 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-02 22:25:18,169 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-02 22:25:18,169 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-02 22:25:18,169 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-02 22:25:18,169 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-02 22:25:18,170 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-02 22:25:18,170 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-02 22:25:18,170 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-02 22:25:18,170 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-02 22:25:18,171 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-02 22:25:18,171 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-02 22:25:18,171 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-02 22:25:18,172 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-02 22:25:18,172 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:25:18,172 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-02 22:25:18,172 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-02 22:25:18,173 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-02 22:25:18,173 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-02 22:25:18,173 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-02 22:25:18,173 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_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4cb6276eff0c60579b1d5f7034948eb4f53891709ff48cdd11b3329ec3c4cc2e [2021-11-02 22:25:18,566 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-02 22:25:18,597 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-02 22:25:18,601 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-02 22:25:18,603 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-02 22:25:18,604 INFO L275 PluginConnector]: CDTParser initialized [2021-11-02 22:25:18,605 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/../../sv-benchmarks/c/array-memsafety/substring-alloca-2.i [2021-11-02 22:25:18,680 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/data/001c02502/f50f3a0381564be1a1caacd0007daa88/FLAG10d49ce43 [2021-11-02 22:25:19,425 INFO L306 CDTParser]: Found 1 translation units. [2021-11-02 22:25:19,426 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/sv-benchmarks/c/array-memsafety/substring-alloca-2.i [2021-11-02 22:25:19,441 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/data/001c02502/f50f3a0381564be1a1caacd0007daa88/FLAG10d49ce43 [2021-11-02 22:25:19,664 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/data/001c02502/f50f3a0381564be1a1caacd0007daa88 [2021-11-02 22:25:19,671 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-02 22:25:19,673 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-02 22:25:19,675 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-02 22:25:19,675 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-02 22:25:19,680 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-02 22:25:19,681 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:25:19" (1/1) ... [2021-11-02 22:25:19,683 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3b6fc330 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:25:19, skipping insertion in model container [2021-11-02 22:25:19,683 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:25:19" (1/1) ... [2021-11-02 22:25:19,692 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-02 22:25:19,739 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-02 22:25:20,265 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:25:20,286 INFO L203 MainTranslator]: Completed pre-run [2021-11-02 22:25:20,381 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:25:20,424 INFO L208 MainTranslator]: Completed translation [2021-11-02 22:25:20,425 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:25:20 WrapperNode [2021-11-02 22:25:20,425 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-02 22:25:20,427 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-02 22:25:20,427 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-02 22:25:20,428 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-02 22:25:20,444 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:25:20" (1/1) ... [2021-11-02 22:25:20,444 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:25:20" (1/1) ... [2021-11-02 22:25:20,463 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:25:20" (1/1) ... [2021-11-02 22:25:20,463 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:25:20" (1/1) ... [2021-11-02 22:25:20,499 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:25:20" (1/1) ... [2021-11-02 22:25:20,506 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:25:20" (1/1) ... [2021-11-02 22:25:20,523 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:25:20" (1/1) ... [2021-11-02 22:25:20,532 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-02 22:25:20,533 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-02 22:25:20,533 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-02 22:25:20,533 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-02 22:25:20,534 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:25:20" (1/1) ... [2021-11-02 22:25:20,559 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:25:20,576 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:25:20,598 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-02 22:25:20,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-02 22:25:20,658 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-02 22:25:20,659 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-02 22:25:20,660 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-02 22:25:20,661 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-02 22:25:20,662 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2021-11-02 22:25:20,662 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2021-11-02 22:25:20,662 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2021-11-02 22:25:20,663 INFO L138 BoogieDeclarations]: Found implementation of procedure substring [2021-11-02 22:25:20,664 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-02 22:25:20,664 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-02 22:25:20,664 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-02 22:25:20,665 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-02 22:25:20,666 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-02 22:25:20,666 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-02 22:25:20,666 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-02 22:25:20,666 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-02 22:25:20,667 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-02 22:25:20,667 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-02 22:25:20,667 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-02 22:25:20,667 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-02 22:25:20,668 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-02 22:25:20,668 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-02 22:25:20,668 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-02 22:25:20,668 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-02 22:25:20,669 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-02 22:25:20,669 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-02 22:25:20,669 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-02 22:25:20,669 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2021-11-02 22:25:20,669 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2021-11-02 22:25:20,670 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2021-11-02 22:25:20,670 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-02 22:25:20,670 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-02 22:25:20,671 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-02 22:25:20,671 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-02 22:25:20,671 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-02 22:25:20,671 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-02 22:25:20,672 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-02 22:25:20,672 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-02 22:25:20,672 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-02 22:25:20,672 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-02 22:25:20,673 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-02 22:25:20,673 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-02 22:25:20,673 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-02 22:25:20,673 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-02 22:25:20,673 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-02 22:25:20,674 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-02 22:25:20,674 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-02 22:25:20,674 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-02 22:25:20,675 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-02 22:25:20,676 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-02 22:25:20,676 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-02 22:25:20,676 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-02 22:25:20,676 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-02 22:25:20,678 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-02 22:25:20,678 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-02 22:25:20,678 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-02 22:25:20,679 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-02 22:25:20,679 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-02 22:25:20,679 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-02 22:25:20,680 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-02 22:25:20,680 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-02 22:25:20,680 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-02 22:25:20,680 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-02 22:25:20,680 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-02 22:25:20,681 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-02 22:25:20,681 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-02 22:25:20,681 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-02 22:25:20,682 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-02 22:25:20,684 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-02 22:25:20,684 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-02 22:25:20,685 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-02 22:25:20,686 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-11-02 22:25:20,686 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-02 22:25:20,686 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-02 22:25:20,686 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-11-02 22:25:20,687 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-02 22:25:20,687 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-02 22:25:20,687 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-11-02 22:25:20,687 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-02 22:25:20,687 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-02 22:25:20,688 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-02 22:25:20,688 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-02 22:25:20,689 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-02 22:25:20,689 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-02 22:25:20,692 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-02 22:25:20,692 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-02 22:25:20,693 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-02 22:25:20,693 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-02 22:25:20,693 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-02 22:25:20,693 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-02 22:25:20,693 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-02 22:25:20,694 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-02 22:25:20,694 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-02 22:25:20,694 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-02 22:25:20,694 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-02 22:25:20,695 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-02 22:25:20,695 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-02 22:25:20,695 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-02 22:25:20,695 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-02 22:25:20,695 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-02 22:25:20,696 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-02 22:25:20,696 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-02 22:25:20,696 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-02 22:25:20,696 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-02 22:25:20,696 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-02 22:25:20,696 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-02 22:25:20,696 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-02 22:25:20,696 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-02 22:25:20,697 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-02 22:25:20,697 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-02 22:25:20,697 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-02 22:25:20,697 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-02 22:25:20,697 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-02 22:25:20,697 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-02 22:25:20,697 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-02 22:25:20,697 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-02 22:25:20,697 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-11-02 22:25:20,698 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2021-11-02 22:25:20,698 INFO L130 BoogieDeclarations]: Found specification of procedure substring [2021-11-02 22:25:20,698 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-02 22:25:20,698 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-02 22:25:20,698 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-02 22:25:20,698 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-02 22:25:20,698 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-02 22:25:20,698 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-02 22:25:20,698 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-02 22:25:21,483 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-02 22:25:21,486 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-02 22:25:21,491 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:25:21 BoogieIcfgContainer [2021-11-02 22:25:21,492 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-02 22:25:21,501 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-02 22:25:21,501 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-02 22:25:21,506 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-02 22:25:21,506 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 10:25:19" (1/3) ... [2021-11-02 22:25:21,508 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18de7f7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:25:21, skipping insertion in model container [2021-11-02 22:25:21,509 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:25:20" (2/3) ... [2021-11-02 22:25:21,510 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18de7f7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:25:21, skipping insertion in model container [2021-11-02 22:25:21,510 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:25:21" (3/3) ... [2021-11-02 22:25:21,513 INFO L111 eAbstractionObserver]: Analyzing ICFG substring-alloca-2.i [2021-11-02 22:25:21,529 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-02 22:25:21,529 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 19 error locations. [2021-11-02 22:25:21,605 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-02 22:25:21,617 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 [2021-11-02 22:25:21,617 INFO L340 AbstractCegarLoop]: Starting to check reachability of 19 error locations. [2021-11-02 22:25:21,641 INFO L276 IsEmpty]: Start isEmpty. Operand has 60 states, 34 states have (on average 1.911764705882353) internal successors, (65), 53 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:25:21,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-02 22:25:21,651 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:21,652 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:21,653 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:21,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:21,660 INFO L85 PathProgramCache]: Analyzing trace with hash -391744755, now seen corresponding path program 1 times [2021-11-02 22:25:21,685 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:21,687 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833470655] [2021-11-02 22:25:21,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:21,688 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:21,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:22,032 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:22,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:22,062 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:22,062 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:22,063 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833470655] [2021-11-02 22:25:22,064 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1833470655] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:22,064 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:22,064 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-02 22:25:22,070 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354064627] [2021-11-02 22:25:22,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:25:22,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:22,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:25:22,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:25:22,102 INFO L87 Difference]: Start difference. First operand has 60 states, 34 states have (on average 1.911764705882353) internal successors, (65), 53 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:22,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:22,384 INFO L93 Difference]: Finished difference Result 81 states and 91 transitions. [2021-11-02 22:25:22,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:25:22,386 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-11-02 22:25:22,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:22,399 INFO L225 Difference]: With dead ends: 81 [2021-11-02 22:25:22,399 INFO L226 Difference]: Without dead ends: 77 [2021-11-02 22:25:22,401 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:25:22,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-02 22:25:22,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 60. [2021-11-02 22:25:22,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 36 states have (on average 1.75) internal successors, (63), 54 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:22,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 68 transitions. [2021-11-02 22:25:22,453 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 68 transitions. Word has length 11 [2021-11-02 22:25:22,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:22,454 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 68 transitions. [2021-11-02 22:25:22,455 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:22,455 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 68 transitions. [2021-11-02 22:25:22,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-02 22:25:22,456 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:22,456 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:22,456 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-02 22:25:22,457 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:22,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:22,458 INFO L85 PathProgramCache]: Analyzing trace with hash -389897713, now seen corresponding path program 1 times [2021-11-02 22:25:22,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:22,458 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [523166129] [2021-11-02 22:25:22,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:22,459 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:22,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:22,612 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:22,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:22,638 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:22,639 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:22,639 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [523166129] [2021-11-02 22:25:22,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [523166129] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:22,640 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:22,640 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:25:22,641 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185886444] [2021-11-02 22:25:22,642 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:25:22,643 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:22,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:25:22,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:25:22,646 INFO L87 Difference]: Start difference. First operand 60 states and 68 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:22,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:22,917 INFO L93 Difference]: Finished difference Result 82 states and 92 transitions. [2021-11-02 22:25:22,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:25:22,918 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-11-02 22:25:22,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:22,924 INFO L225 Difference]: With dead ends: 82 [2021-11-02 22:25:22,925 INFO L226 Difference]: Without dead ends: 82 [2021-11-02 22:25:22,926 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 [2021-11-02 22:25:22,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-02 22:25:22,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 62. [2021-11-02 22:25:22,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 38 states have (on average 1.763157894736842) internal successors, (67), 56 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:22,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 72 transitions. [2021-11-02 22:25:22,954 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 72 transitions. Word has length 11 [2021-11-02 22:25:22,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:22,954 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 72 transitions. [2021-11-02 22:25:22,955 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:22,955 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 72 transitions. [2021-11-02 22:25:22,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-02 22:25:22,956 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:22,956 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:22,956 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-02 22:25:22,957 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:22,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:22,958 INFO L85 PathProgramCache]: Analyzing trace with hash -389897714, now seen corresponding path program 1 times [2021-11-02 22:25:22,958 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:22,958 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [230384150] [2021-11-02 22:25:22,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:22,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:22,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:23,057 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:23,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:23,074 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:23,074 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:23,075 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [230384150] [2021-11-02 22:25:23,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [230384150] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:23,077 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:23,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:25:23,078 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477766856] [2021-11-02 22:25:23,079 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:25:23,080 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:23,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:25:23,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:25:23,082 INFO L87 Difference]: Start difference. First operand 62 states and 72 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:23,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:23,241 INFO L93 Difference]: Finished difference Result 60 states and 69 transitions. [2021-11-02 22:25:23,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:25:23,242 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-11-02 22:25:23,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:23,244 INFO L225 Difference]: With dead ends: 60 [2021-11-02 22:25:23,244 INFO L226 Difference]: Without dead ends: 60 [2021-11-02 22:25:23,245 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 [2021-11-02 22:25:23,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-02 22:25:23,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-11-02 22:25:23,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 54 states have internal predecessors, (64), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:23,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 69 transitions. [2021-11-02 22:25:23,265 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 69 transitions. Word has length 11 [2021-11-02 22:25:23,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:23,265 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 69 transitions. [2021-11-02 22:25:23,266 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:23,266 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 69 transitions. [2021-11-02 22:25:23,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-02 22:25:23,267 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:23,267 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:23,268 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-02 22:25:23,268 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:23,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:23,269 INFO L85 PathProgramCache]: Analyzing trace with hash 1490361092, now seen corresponding path program 1 times [2021-11-02 22:25:23,270 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:23,270 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [116531517] [2021-11-02 22:25:23,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:23,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:23,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:23,417 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:23,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:23,434 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:23,435 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:23,435 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [116531517] [2021-11-02 22:25:23,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [116531517] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:23,437 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:23,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:25:23,440 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980998497] [2021-11-02 22:25:23,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:25:23,443 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:23,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:25:23,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:25:23,446 INFO L87 Difference]: Start difference. First operand 60 states and 69 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:23,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:23,628 INFO L93 Difference]: Finished difference Result 59 states and 68 transitions. [2021-11-02 22:25:23,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:25:23,629 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-11-02 22:25:23,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:23,633 INFO L225 Difference]: With dead ends: 59 [2021-11-02 22:25:23,633 INFO L226 Difference]: Without dead ends: 59 [2021-11-02 22:25:23,634 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 [2021-11-02 22:25:23,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-02 22:25:23,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-02 22:25:23,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 38 states have (on average 1.6578947368421053) internal successors, (63), 53 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:23,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 68 transitions. [2021-11-02 22:25:23,646 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 68 transitions. Word has length 13 [2021-11-02 22:25:23,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:23,646 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 68 transitions. [2021-11-02 22:25:23,647 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:23,647 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 68 transitions. [2021-11-02 22:25:23,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-02 22:25:23,648 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:23,648 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:23,648 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-02 22:25:23,648 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr2REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:23,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:23,649 INFO L85 PathProgramCache]: Analyzing trace with hash 1490361144, now seen corresponding path program 1 times [2021-11-02 22:25:23,649 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:23,650 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3907258] [2021-11-02 22:25:23,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:23,650 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:23,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:23,738 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:23,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:23,748 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:23,748 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:23,748 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3907258] [2021-11-02 22:25:23,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [3907258] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:23,749 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:23,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-02 22:25:23,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172061209] [2021-11-02 22:25:23,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:25:23,751 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:23,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:25:23,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:25:23,752 INFO L87 Difference]: Start difference. First operand 59 states and 68 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:23,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:23,885 INFO L93 Difference]: Finished difference Result 79 states and 90 transitions. [2021-11-02 22:25:23,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:25:23,886 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-11-02 22:25:23,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:23,888 INFO L225 Difference]: With dead ends: 79 [2021-11-02 22:25:23,888 INFO L226 Difference]: Without dead ends: 79 [2021-11-02 22:25:23,890 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 [2021-11-02 22:25:23,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-02 22:25:23,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 70. [2021-11-02 22:25:23,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 49 states have (on average 1.5714285714285714) internal successors, (77), 64 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:23,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 82 transitions. [2021-11-02 22:25:23,912 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 82 transitions. Word has length 13 [2021-11-02 22:25:23,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:23,913 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 82 transitions. [2021-11-02 22:25:23,913 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:23,913 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 82 transitions. [2021-11-02 22:25:23,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-02 22:25:23,914 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:23,915 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:23,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-02 22:25:23,915 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr2REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:23,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:23,916 INFO L85 PathProgramCache]: Analyzing trace with hash 1547619446, now seen corresponding path program 1 times [2021-11-02 22:25:23,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:23,917 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2066550676] [2021-11-02 22:25:23,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:23,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:23,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:23,996 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:23,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:24,010 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:24,010 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:24,011 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2066550676] [2021-11-02 22:25:24,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2066550676] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:24,011 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:24,011 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:25:24,012 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163732864] [2021-11-02 22:25:24,012 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:25:24,013 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:24,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:25:24,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:25:24,014 INFO L87 Difference]: Start difference. First operand 70 states and 82 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:24,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:24,131 INFO L93 Difference]: Finished difference Result 68 states and 80 transitions. [2021-11-02 22:25:24,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:25:24,132 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-11-02 22:25:24,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:24,133 INFO L225 Difference]: With dead ends: 68 [2021-11-02 22:25:24,134 INFO L226 Difference]: Without dead ends: 68 [2021-11-02 22:25:24,135 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 [2021-11-02 22:25:24,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-02 22:25:24,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-02 22:25:24,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 49 states have (on average 1.530612244897959) internal successors, (75), 62 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:24,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 80 transitions. [2021-11-02 22:25:24,158 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 80 transitions. Word has length 13 [2021-11-02 22:25:24,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:24,158 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 80 transitions. [2021-11-02 22:25:24,159 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:24,160 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 80 transitions. [2021-11-02 22:25:24,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-02 22:25:24,161 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:24,162 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:24,162 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-02 22:25:24,162 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:24,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:24,163 INFO L85 PathProgramCache]: Analyzing trace with hash 1547619447, now seen corresponding path program 1 times [2021-11-02 22:25:24,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:24,164 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134684089] [2021-11-02 22:25:24,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:24,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:24,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:24,298 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:24,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:24,309 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:24,312 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:24,312 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134684089] [2021-11-02 22:25:24,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134684089] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:24,313 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:24,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-02 22:25:24,314 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666879695] [2021-11-02 22:25:24,315 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:25:24,315 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:24,316 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:25:24,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:25:24,317 INFO L87 Difference]: Start difference. First operand 68 states and 80 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:24,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:24,496 INFO L93 Difference]: Finished difference Result 79 states and 92 transitions. [2021-11-02 22:25:24,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:25:24,497 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-11-02 22:25:24,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:24,499 INFO L225 Difference]: With dead ends: 79 [2021-11-02 22:25:24,499 INFO L226 Difference]: Without dead ends: 79 [2021-11-02 22:25:24,500 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:25:24,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-02 22:25:24,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 70. [2021-11-02 22:25:24,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 51 states have (on average 1.5294117647058822) internal successors, (78), 64 states have internal predecessors, (78), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:24,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 83 transitions. [2021-11-02 22:25:24,508 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 83 transitions. Word has length 13 [2021-11-02 22:25:24,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:24,508 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 83 transitions. [2021-11-02 22:25:24,509 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:24,509 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 83 transitions. [2021-11-02 22:25:24,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-02 22:25:24,510 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:24,510 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:24,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-02 22:25:24,511 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:24,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:24,512 INFO L85 PathProgramCache]: Analyzing trace with hash -1043446404, now seen corresponding path program 1 times [2021-11-02 22:25:24,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:24,513 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653752698] [2021-11-02 22:25:24,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:24,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:24,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:24,607 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:24,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:24,619 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:24,620 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:24,620 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653752698] [2021-11-02 22:25:24,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1653752698] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:24,621 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:24,621 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:25:24,621 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662381569] [2021-11-02 22:25:24,622 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:25:24,622 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:24,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:25:24,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:25:24,623 INFO L87 Difference]: Start difference. First operand 70 states and 83 transitions. Second operand has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:24,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:24,745 INFO L93 Difference]: Finished difference Result 69 states and 82 transitions. [2021-11-02 22:25:24,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:25:24,746 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-11-02 22:25:24,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:24,747 INFO L225 Difference]: With dead ends: 69 [2021-11-02 22:25:24,747 INFO L226 Difference]: Without dead ends: 69 [2021-11-02 22:25:24,747 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 [2021-11-02 22:25:24,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-11-02 22:25:24,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-11-02 22:25:24,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 51 states have (on average 1.5098039215686274) internal successors, (77), 63 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:24,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 82 transitions. [2021-11-02 22:25:24,751 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 82 transitions. Word has length 14 [2021-11-02 22:25:24,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:24,751 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 82 transitions. [2021-11-02 22:25:24,751 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:24,752 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 82 transitions. [2021-11-02 22:25:24,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-02 22:25:24,753 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:24,753 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:24,753 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-02 22:25:24,753 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting mainErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:24,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:24,754 INFO L85 PathProgramCache]: Analyzing trace with hash -1553442094, now seen corresponding path program 1 times [2021-11-02 22:25:24,754 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:24,754 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1807299810] [2021-11-02 22:25:24,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:24,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:24,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:24,856 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:24,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:24,861 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:24,862 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:24,862 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1807299810] [2021-11-02 22:25:24,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1807299810] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:24,863 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [449732300] [2021-11-02 22:25:24,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:24,863 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:24,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:25:24,866 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:25:24,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-02 22:25:25,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:25,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-02 22:25:25,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:25:25,189 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:25:25,190 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-02 22:25:25,209 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-02 22:25:25,351 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:25,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [449732300] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:25,352 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:25:25,353 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-11-02 22:25:25,353 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099612231] [2021-11-02 22:25:25,354 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:25:25,354 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:25,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:25:25,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:25:25,355 INFO L87 Difference]: Start difference. First operand 69 states and 82 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 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) [2021-11-02 22:25:25,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:25,572 INFO L93 Difference]: Finished difference Result 88 states and 102 transitions. [2021-11-02 22:25:25,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:25:25,573 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 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 15 [2021-11-02 22:25:25,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:25,574 INFO L225 Difference]: With dead ends: 88 [2021-11-02 22:25:25,574 INFO L226 Difference]: Without dead ends: 88 [2021-11-02 22:25:25,574 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 [2021-11-02 22:25:25,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-02 22:25:25,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 64. [2021-11-02 22:25:25,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 47 states have (on average 1.4680851063829787) internal successors, (69), 58 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:25,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 74 transitions. [2021-11-02 22:25:25,578 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 74 transitions. Word has length 15 [2021-11-02 22:25:25,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:25,578 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 74 transitions. [2021-11-02 22:25:25,578 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 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) [2021-11-02 22:25:25,579 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 74 transitions. [2021-11-02 22:25:25,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-02 22:25:25,579 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:25,580 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:25,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-02 22:25:25,804 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:25,804 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting substringErr0REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:25,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:25,805 INFO L85 PathProgramCache]: Analyzing trace with hash 1661532524, now seen corresponding path program 1 times [2021-11-02 22:25:25,805 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:25,806 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603790282] [2021-11-02 22:25:25,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:25,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:25,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:25,864 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:25,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:25,872 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:25,872 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:25,875 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603790282] [2021-11-02 22:25:25,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [603790282] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:25,876 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:25,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-02 22:25:25,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852007259] [2021-11-02 22:25:25,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:25:25,877 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:25,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:25:25,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:25:25,878 INFO L87 Difference]: Start difference. First operand 64 states and 74 transitions. Second operand has 6 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:26,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:26,032 INFO L93 Difference]: Finished difference Result 63 states and 73 transitions. [2021-11-02 22:25:26,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:25:26,032 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-11-02 22:25:26,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:26,034 INFO L225 Difference]: With dead ends: 63 [2021-11-02 22:25:26,034 INFO L226 Difference]: Without dead ends: 63 [2021-11-02 22:25:26,034 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:25:26,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-02 22:25:26,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-11-02 22:25:26,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 47 states have (on average 1.446808510638298) internal successors, (68), 57 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:26,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 73 transitions. [2021-11-02 22:25:26,039 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 73 transitions. Word has length 17 [2021-11-02 22:25:26,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:26,042 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 73 transitions. [2021-11-02 22:25:26,042 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:26,042 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 73 transitions. [2021-11-02 22:25:26,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-02 22:25:26,045 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:26,045 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:26,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-02 22:25:26,046 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:26,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:26,050 INFO L85 PathProgramCache]: Analyzing trace with hash 1661532525, now seen corresponding path program 1 times [2021-11-02 22:25:26,050 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:26,051 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [594213725] [2021-11-02 22:25:26,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:26,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:26,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:26,194 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:26,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:26,200 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:26,201 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:26,201 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [594213725] [2021-11-02 22:25:26,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [594213725] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:26,202 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:26,202 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:25:26,203 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932371417] [2021-11-02 22:25:26,203 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:25:26,203 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:26,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:25:26,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:25:26,205 INFO L87 Difference]: Start difference. First operand 63 states and 73 transitions. Second operand has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:26,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:26,542 INFO L93 Difference]: Finished difference Result 85 states and 99 transitions. [2021-11-02 22:25:26,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:25:26,543 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-11-02 22:25:26,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:26,546 INFO L225 Difference]: With dead ends: 85 [2021-11-02 22:25:26,546 INFO L226 Difference]: Without dead ends: 85 [2021-11-02 22:25:26,547 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:25:26,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-02 22:25:26,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 64. [2021-11-02 22:25:26,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 48 states have (on average 1.4375) internal successors, (69), 58 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:26,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 74 transitions. [2021-11-02 22:25:26,550 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 74 transitions. Word has length 17 [2021-11-02 22:25:26,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:26,551 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 74 transitions. [2021-11-02 22:25:26,551 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:26,551 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 74 transitions. [2021-11-02 22:25:26,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-02 22:25:26,552 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:26,552 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:26,552 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-02 22:25:26,553 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:26,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:26,553 INFO L85 PathProgramCache]: Analyzing trace with hash 1317111226, now seen corresponding path program 1 times [2021-11-02 22:25:26,553 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:26,554 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570864108] [2021-11-02 22:25:26,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:26,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:26,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:26,676 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:26,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:26,681 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:26,681 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:26,681 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570864108] [2021-11-02 22:25:26,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570864108] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:26,682 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [49250473] [2021-11-02 22:25:26,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:26,682 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:26,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:25:26,697 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:25:26,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-02 22:25:26,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:26,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-02 22:25:26,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:25:26,966 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:25:26,967 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:25:27,116 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:27,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [49250473] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:27,116 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:25:27,116 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-11-02 22:25:27,117 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437121184] [2021-11-02 22:25:27,117 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:25:27,117 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:27,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:25:27,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:25:27,119 INFO L87 Difference]: Start difference. First operand 64 states and 74 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 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) [2021-11-02 22:25:27,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:27,318 INFO L93 Difference]: Finished difference Result 71 states and 81 transitions. [2021-11-02 22:25:27,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:25:27,319 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 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 17 [2021-11-02 22:25:27,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:27,321 INFO L225 Difference]: With dead ends: 71 [2021-11-02 22:25:27,321 INFO L226 Difference]: Without dead ends: 71 [2021-11-02 22:25:27,321 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:25:27,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-02 22:25:27,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 61. [2021-11-02 22:25:27,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 46 states have (on average 1.4130434782608696) internal successors, (65), 55 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:27,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 70 transitions. [2021-11-02 22:25:27,325 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 70 transitions. Word has length 17 [2021-11-02 22:25:27,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:27,326 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 70 transitions. [2021-11-02 22:25:27,326 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 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) [2021-11-02 22:25:27,327 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 70 transitions. [2021-11-02 22:25:27,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-02 22:25:27,328 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:27,328 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:27,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-02 22:25:27,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-02 22:25:27,544 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting substringErr2REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:27,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:27,545 INFO L85 PathProgramCache]: Analyzing trace with hash -995076911, now seen corresponding path program 1 times [2021-11-02 22:25:27,545 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:27,545 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [37494950] [2021-11-02 22:25:27,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:27,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:27,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:27,606 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:27,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:27,612 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:27,612 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:27,613 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [37494950] [2021-11-02 22:25:27,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [37494950] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:27,613 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:27,613 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-02 22:25:27,614 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189806504] [2021-11-02 22:25:27,614 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:25:27,614 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:27,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:25:27,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:25:27,615 INFO L87 Difference]: Start difference. First operand 61 states and 70 transitions. Second operand has 7 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:27,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:27,782 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2021-11-02 22:25:27,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:25:27,783 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-11-02 22:25:27,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:27,784 INFO L225 Difference]: With dead ends: 62 [2021-11-02 22:25:27,784 INFO L226 Difference]: Without dead ends: 62 [2021-11-02 22:25:27,784 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:25:27,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-02 22:25:27,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 58. [2021-11-02 22:25:27,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 46 states have (on average 1.3478260869565217) internal successors, (62), 52 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:27,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 67 transitions. [2021-11-02 22:25:27,787 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 67 transitions. Word has length 19 [2021-11-02 22:25:27,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:27,788 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 67 transitions. [2021-11-02 22:25:27,788 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:27,788 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 67 transitions. [2021-11-02 22:25:27,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-02 22:25:27,789 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:27,789 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:27,789 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-02 22:25:27,789 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:27,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:27,790 INFO L85 PathProgramCache]: Analyzing trace with hash -995076910, now seen corresponding path program 1 times [2021-11-02 22:25:27,790 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:27,790 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78432276] [2021-11-02 22:25:27,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:27,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:27,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:27,920 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:27,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:27,926 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:27,927 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:27,927 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78432276] [2021-11-02 22:25:27,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [78432276] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:27,928 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:27,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:25:27,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837135966] [2021-11-02 22:25:27,929 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:25:27,929 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:27,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:25:27,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:25:27,930 INFO L87 Difference]: Start difference. First operand 58 states and 67 transitions. Second operand has 9 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:28,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:28,201 INFO L93 Difference]: Finished difference Result 75 states and 88 transitions. [2021-11-02 22:25:28,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:25:28,203 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-11-02 22:25:28,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:28,204 INFO L225 Difference]: With dead ends: 75 [2021-11-02 22:25:28,204 INFO L226 Difference]: Without dead ends: 75 [2021-11-02 22:25:28,204 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:25:28,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-02 22:25:28,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 66. [2021-11-02 22:25:28,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 54 states have (on average 1.3703703703703705) internal successors, (74), 60 states have internal predecessors, (74), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:28,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 79 transitions. [2021-11-02 22:25:28,208 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 79 transitions. Word has length 19 [2021-11-02 22:25:28,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:28,209 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 79 transitions. [2021-11-02 22:25:28,209 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:28,209 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 79 transitions. [2021-11-02 22:25:28,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-02 22:25:28,210 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:28,210 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] [2021-11-02 22:25:28,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-02 22:25:28,211 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:28,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:28,211 INFO L85 PathProgramCache]: Analyzing trace with hash -1744606647, now seen corresponding path program 1 times [2021-11-02 22:25:28,211 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:28,212 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658337159] [2021-11-02 22:25:28,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:28,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:28,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:28,246 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:28,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:28,250 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:28,250 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:28,251 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658337159] [2021-11-02 22:25:28,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1658337159] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:28,251 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:28,251 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:25:28,251 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866492427] [2021-11-02 22:25:28,252 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:25:28,252 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:28,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:25:28,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:25:28,253 INFO L87 Difference]: Start difference. First operand 66 states and 79 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 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) [2021-11-02 22:25:28,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:28,331 INFO L93 Difference]: Finished difference Result 68 states and 81 transitions. [2021-11-02 22:25:28,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:25:28,332 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 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 23 [2021-11-02 22:25:28,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:28,333 INFO L225 Difference]: With dead ends: 68 [2021-11-02 22:25:28,333 INFO L226 Difference]: Without dead ends: 68 [2021-11-02 22:25:28,334 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:25:28,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-02 22:25:28,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-02 22:25:28,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 56 states have (on average 1.3571428571428572) internal successors, (76), 62 states have internal predecessors, (76), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:28,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 81 transitions. [2021-11-02 22:25:28,337 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 81 transitions. Word has length 23 [2021-11-02 22:25:28,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:28,338 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 81 transitions. [2021-11-02 22:25:28,338 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 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) [2021-11-02 22:25:28,338 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 81 transitions. [2021-11-02 22:25:28,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-02 22:25:28,339 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:28,339 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] [2021-11-02 22:25:28,339 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-02 22:25:28,339 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting substringErr6REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:28,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:28,340 INFO L85 PathProgramCache]: Analyzing trace with hash -1744615721, now seen corresponding path program 1 times [2021-11-02 22:25:28,340 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:28,340 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [196297230] [2021-11-02 22:25:28,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:28,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:28,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:28,396 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:28,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:28,405 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:28,405 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:28,406 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [196297230] [2021-11-02 22:25:28,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [196297230] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:28,406 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:28,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-02 22:25:28,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798001416] [2021-11-02 22:25:28,407 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:25:28,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:28,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:25:28,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:25:28,410 INFO L87 Difference]: Start difference. First operand 68 states and 81 transitions. Second operand has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:28,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:28,596 INFO L93 Difference]: Finished difference Result 71 states and 84 transitions. [2021-11-02 22:25:28,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:25:28,597 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-11-02 22:25:28,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:28,598 INFO L225 Difference]: With dead ends: 71 [2021-11-02 22:25:28,598 INFO L226 Difference]: Without dead ends: 71 [2021-11-02 22:25:28,598 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:25:28,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-02 22:25:28,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 67. [2021-11-02 22:25:28,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 56 states have (on average 1.3214285714285714) internal successors, (74), 61 states have internal predecessors, (74), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:28,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 79 transitions. [2021-11-02 22:25:28,602 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 79 transitions. Word has length 23 [2021-11-02 22:25:28,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:28,603 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 79 transitions. [2021-11-02 22:25:28,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:28,603 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 79 transitions. [2021-11-02 22:25:28,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-02 22:25:28,604 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:28,604 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] [2021-11-02 22:25:28,604 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-02 22:25:28,605 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:28,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:28,605 INFO L85 PathProgramCache]: Analyzing trace with hash -1744615720, now seen corresponding path program 1 times [2021-11-02 22:25:28,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:28,606 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919366706] [2021-11-02 22:25:28,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:28,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:28,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:28,704 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:28,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:28,709 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:28,709 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:28,709 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919366706] [2021-11-02 22:25:28,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [919366706] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:28,710 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:28,710 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:25:28,710 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470870976] [2021-11-02 22:25:28,711 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:25:28,712 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:28,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:25:28,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:25:28,713 INFO L87 Difference]: Start difference. First operand 67 states and 79 transitions. Second operand has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:29,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:29,022 INFO L93 Difference]: Finished difference Result 103 states and 123 transitions. [2021-11-02 22:25:29,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:25:29,022 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-11-02 22:25:29,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:29,024 INFO L225 Difference]: With dead ends: 103 [2021-11-02 22:25:29,024 INFO L226 Difference]: Without dead ends: 103 [2021-11-02 22:25:29,024 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:25:29,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-02 22:25:29,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 73. [2021-11-02 22:25:29,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 62 states have (on average 1.3225806451612903) internal successors, (82), 67 states have internal predecessors, (82), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:29,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2021-11-02 22:25:29,029 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 23 [2021-11-02 22:25:29,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:29,030 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2021-11-02 22:25:29,030 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:29,030 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2021-11-02 22:25:29,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-02 22:25:29,031 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:29,031 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] [2021-11-02 22:25:29,032 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-02 22:25:29,032 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting mainErr8ENSURES_VIOLATIONMEMORY_LEAK === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:29,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:29,033 INFO L85 PathProgramCache]: Analyzing trace with hash -1768533058, now seen corresponding path program 1 times [2021-11-02 22:25:29,033 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:29,033 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360689670] [2021-11-02 22:25:29,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:29,033 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:29,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:29,102 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:29,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:29,117 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-11-02 22:25:29,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:29,132 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:29,132 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:29,132 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360689670] [2021-11-02 22:25:29,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1360689670] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:29,133 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:29,133 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:25:29,133 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023423149] [2021-11-02 22:25:29,134 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:25:29,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:29,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:25:29,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:25:29,135 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand has 5 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:29,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:29,214 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2021-11-02 22:25:29,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:25:29,215 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2021-11-02 22:25:29,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:29,216 INFO L225 Difference]: With dead ends: 72 [2021-11-02 22:25:29,216 INFO L226 Difference]: Without dead ends: 67 [2021-11-02 22:25:29,216 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:25:29,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-02 22:25:29,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-11-02 22:25:29,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 58 states have (on average 1.293103448275862) internal successors, (75), 62 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:29,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 79 transitions. [2021-11-02 22:25:29,220 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 79 transitions. Word has length 23 [2021-11-02 22:25:29,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:29,221 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 79 transitions. [2021-11-02 22:25:29,221 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:29,221 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 79 transitions. [2021-11-02 22:25:29,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-02 22:25:29,222 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:29,222 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] [2021-11-02 22:25:29,222 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-02 22:25:29,222 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:29,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:29,223 INFO L85 PathProgramCache]: Analyzing trace with hash -1529776103, now seen corresponding path program 1 times [2021-11-02 22:25:29,223 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:29,224 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [228298940] [2021-11-02 22:25:29,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:29,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:29,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:29,290 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:29,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:29,299 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:29,299 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:29,300 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [228298940] [2021-11-02 22:25:29,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [228298940] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:29,300 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:29,300 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:25:29,302 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [808666417] [2021-11-02 22:25:29,304 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:25:29,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:29,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:25:29,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:25:29,306 INFO L87 Difference]: Start difference. First operand 67 states and 79 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 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) [2021-11-02 22:25:29,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:29,477 INFO L93 Difference]: Finished difference Result 71 states and 82 transitions. [2021-11-02 22:25:29,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:25:29,478 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 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 25 [2021-11-02 22:25:29,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:29,479 INFO L225 Difference]: With dead ends: 71 [2021-11-02 22:25:29,479 INFO L226 Difference]: Without dead ends: 68 [2021-11-02 22:25:29,480 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:25:29,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-02 22:25:29,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2021-11-02 22:25:29,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 58 states have (on average 1.2586206896551724) internal successors, (73), 62 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:29,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 77 transitions. [2021-11-02 22:25:29,484 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 77 transitions. Word has length 25 [2021-11-02 22:25:29,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:29,484 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 77 transitions. [2021-11-02 22:25:29,485 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 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) [2021-11-02 22:25:29,485 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 77 transitions. [2021-11-02 22:25:29,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-02 22:25:29,487 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:29,487 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] [2021-11-02 22:25:29,489 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-02 22:25:29,490 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:29,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:29,491 INFO L85 PathProgramCache]: Analyzing trace with hash -447626662, now seen corresponding path program 1 times [2021-11-02 22:25:29,491 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:29,492 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851369921] [2021-11-02 22:25:29,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:29,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:29,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:29,733 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:29,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:29,754 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:25:29,757 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:29,757 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851369921] [2021-11-02 22:25:29,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1851369921] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:29,758 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:29,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-02 22:25:29,758 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048614914] [2021-11-02 22:25:29,759 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:25:29,761 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:29,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:25:29,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:25:29,762 INFO L87 Difference]: Start difference. First operand 67 states and 77 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:29,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:29,991 INFO L93 Difference]: Finished difference Result 80 states and 90 transitions. [2021-11-02 22:25:29,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:25:29,991 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-11-02 22:25:29,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:29,992 INFO L225 Difference]: With dead ends: 80 [2021-11-02 22:25:29,992 INFO L226 Difference]: Without dead ends: 62 [2021-11-02 22:25:29,993 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:25:29,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-02 22:25:29,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-11-02 22:25:29,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 53 states have (on average 1.2452830188679245) internal successors, (66), 57 states have internal predecessors, (66), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:29,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 70 transitions. [2021-11-02 22:25:29,996 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 70 transitions. Word has length 26 [2021-11-02 22:25:29,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:29,996 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 70 transitions. [2021-11-02 22:25:29,997 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:29,997 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 70 transitions. [2021-11-02 22:25:29,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-02 22:25:29,997 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:29,997 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] [2021-11-02 22:25:29,998 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-02 22:25:29,998 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:29,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:29,998 INFO L85 PathProgramCache]: Analyzing trace with hash -1265275112, now seen corresponding path program 1 times [2021-11-02 22:25:29,999 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:29,999 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619963498] [2021-11-02 22:25:29,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:29,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:30,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:30,203 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:30,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:30,208 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:25:30,208 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:30,209 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619963498] [2021-11-02 22:25:30,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [619963498] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:30,209 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:30,209 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-02 22:25:30,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329891248] [2021-11-02 22:25:30,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:25:30,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:30,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:25:30,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:25:30,211 INFO L87 Difference]: Start difference. First operand 62 states and 70 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:30,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:30,455 INFO L93 Difference]: Finished difference Result 83 states and 93 transitions. [2021-11-02 22:25:30,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:25:30,455 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-11-02 22:25:30,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:30,456 INFO L225 Difference]: With dead ends: 83 [2021-11-02 22:25:30,456 INFO L226 Difference]: Without dead ends: 70 [2021-11-02 22:25:30,457 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:25:30,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-02 22:25:30,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 64. [2021-11-02 22:25:30,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 55 states have (on average 1.2363636363636363) internal successors, (68), 59 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:30,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2021-11-02 22:25:30,460 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 26 [2021-11-02 22:25:30,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:30,460 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2021-11-02 22:25:30,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:30,460 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2021-11-02 22:25:30,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-02 22:25:30,461 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:30,461 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, 1, 1, 1] [2021-11-02 22:25:30,461 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-02 22:25:30,461 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:30,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:30,462 INFO L85 PathProgramCache]: Analyzing trace with hash 1692710901, now seen corresponding path program 1 times [2021-11-02 22:25:30,462 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:30,462 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1280005909] [2021-11-02 22:25:30,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:30,462 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:30,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:30,625 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:30,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:30,630 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:25:30,631 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:30,631 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1280005909] [2021-11-02 22:25:30,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1280005909] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:30,631 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:30,632 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:25:30,632 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48621966] [2021-11-02 22:25:30,634 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-02 22:25:30,635 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:30,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-02 22:25:30,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:25:30,636 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand has 11 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:30,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:30,957 INFO L93 Difference]: Finished difference Result 73 states and 80 transitions. [2021-11-02 22:25:30,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:25:30,960 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-11-02 22:25:30,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:30,960 INFO L225 Difference]: With dead ends: 73 [2021-11-02 22:25:30,961 INFO L226 Difference]: Without dead ends: 56 [2021-11-02 22:25:30,961 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:25:30,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-02 22:25:30,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-11-02 22:25:30,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 47 states have (on average 1.2340425531914894) internal successors, (58), 51 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:30,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 62 transitions. [2021-11-02 22:25:30,965 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 62 transitions. Word has length 30 [2021-11-02 22:25:30,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:30,966 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 62 transitions. [2021-11-02 22:25:30,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:30,966 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 62 transitions. [2021-11-02 22:25:30,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-02 22:25:30,967 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:30,967 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, 1, 1, 1] [2021-11-02 22:25:30,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-02 22:25:30,968 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:30,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:30,968 INFO L85 PathProgramCache]: Analyzing trace with hash -112727433, now seen corresponding path program 1 times [2021-11-02 22:25:30,969 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:30,969 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782192357] [2021-11-02 22:25:30,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:30,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:30,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:31,196 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:31,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:31,209 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:25:31,210 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:31,210 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782192357] [2021-11-02 22:25:31,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1782192357] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:31,210 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:31,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-11-02 22:25:31,211 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600694991] [2021-11-02 22:25:31,211 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-02 22:25:31,211 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:31,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-02 22:25:31,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:25:31,212 INFO L87 Difference]: Start difference. First operand 56 states and 62 transitions. Second operand has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 11 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:31,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:31,571 INFO L93 Difference]: Finished difference Result 69 states and 75 transitions. [2021-11-02 22:25:31,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-02 22:25:31,572 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 11 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-11-02 22:25:31,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:31,573 INFO L225 Difference]: With dead ends: 69 [2021-11-02 22:25:31,573 INFO L226 Difference]: Without dead ends: 60 [2021-11-02 22:25:31,573 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2021-11-02 22:25:31,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-02 22:25:31,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 57. [2021-11-02 22:25:31,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 48 states have (on average 1.2291666666666667) internal successors, (59), 52 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:31,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 63 transitions. [2021-11-02 22:25:31,576 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 63 transitions. Word has length 30 [2021-11-02 22:25:31,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:31,577 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 63 transitions. [2021-11-02 22:25:31,577 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 11 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:31,577 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 63 transitions. [2021-11-02 22:25:31,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-02 22:25:31,578 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:31,578 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, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:31,578 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-02 22:25:31,578 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:31,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:31,579 INFO L85 PathProgramCache]: Analyzing trace with hash -147074924, now seen corresponding path program 1 times [2021-11-02 22:25:31,579 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:31,579 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1894490509] [2021-11-02 22:25:31,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:31,579 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:31,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:31,779 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:31,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:31,788 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:25:31,788 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:31,788 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1894490509] [2021-11-02 22:25:31,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1894490509] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:31,789 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [802228536] [2021-11-02 22:25:31,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:31,789 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:31,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:25:31,790 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:25:31,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-02 22:25:31,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:31,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-02 22:25:31,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:25:32,280 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:25:32,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [802228536] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:32,281 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:25:32,281 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 18 [2021-11-02 22:25:32,281 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136807550] [2021-11-02 22:25:32,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-02 22:25:32,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:32,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-02 22:25:32,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:25:32,283 INFO L87 Difference]: Start difference. First operand 57 states and 63 transitions. Second operand has 19 states, 16 states have (on average 3.4375) internal successors, (55), 16 states have internal predecessors, (55), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:32,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:32,723 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2021-11-02 22:25:32,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:25:32,724 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 3.4375) internal successors, (55), 16 states have internal predecessors, (55), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-11-02 22:25:32,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:32,725 INFO L225 Difference]: With dead ends: 80 [2021-11-02 22:25:32,725 INFO L226 Difference]: Without dead ends: 78 [2021-11-02 22:25:32,726 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:25:32,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-02 22:25:32,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 64. [2021-11-02 22:25:32,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 55 states have (on average 1.2363636363636363) internal successors, (68), 59 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:32,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2021-11-02 22:25:32,729 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 34 [2021-11-02 22:25:32,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:32,730 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2021-11-02 22:25:32,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 3.4375) internal successors, (55), 16 states have internal predecessors, (55), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:32,730 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2021-11-02 22:25:32,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-02 22:25:32,731 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:32,731 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:32,780 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-02 22:25:32,948 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:32,948 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:32,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:32,949 INFO L85 PathProgramCache]: Analyzing trace with hash 394885028, now seen corresponding path program 1 times [2021-11-02 22:25:32,949 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:32,949 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [929030117] [2021-11-02 22:25:32,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:32,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:32,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:33,104 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:33,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:33,110 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:25:33,113 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:33,114 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [929030117] [2021-11-02 22:25:33,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [929030117] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:33,114 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1352290641] [2021-11-02 22:25:33,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:33,115 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:33,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:25:33,116 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:25:33,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-02 22:25:33,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:33,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-02 22:25:33,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:25:33,360 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:25:33,361 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:25:34,074 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:34,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1352290641] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:34,075 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:25:34,075 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 17 [2021-11-02 22:25:34,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758366161] [2021-11-02 22:25:34,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-02 22:25:34,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:34,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-02 22:25:34,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:25:34,079 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand has 18 states, 16 states have (on average 3.1875) internal successors, (51), 15 states have internal predecessors, (51), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:34,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:34,781 INFO L93 Difference]: Finished difference Result 124 states and 143 transitions. [2021-11-02 22:25:34,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:25:34,781 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.1875) internal successors, (51), 15 states have internal predecessors, (51), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-11-02 22:25:34,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:34,783 INFO L225 Difference]: With dead ends: 124 [2021-11-02 22:25:34,783 INFO L226 Difference]: Without dead ends: 124 [2021-11-02 22:25:34,784 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=99, Invalid=551, Unknown=0, NotChecked=0, Total=650 [2021-11-02 22:25:34,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-02 22:25:34,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 84. [2021-11-02 22:25:34,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 75 states have (on average 1.2933333333333332) internal successors, (97), 79 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:34,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 101 transitions. [2021-11-02 22:25:34,788 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 101 transitions. Word has length 36 [2021-11-02 22:25:34,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:34,789 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 101 transitions. [2021-11-02 22:25:34,789 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.1875) internal successors, (51), 15 states have internal predecessors, (51), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:34,789 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 101 transitions. [2021-11-02 22:25:34,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-02 22:25:34,790 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:34,790 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:34,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-02 22:25:34,990 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:34,991 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:34,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:34,991 INFO L85 PathProgramCache]: Analyzing trace with hash 1560744346, now seen corresponding path program 1 times [2021-11-02 22:25:34,991 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:34,991 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1033569755] [2021-11-02 22:25:34,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:34,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:35,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:35,246 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:35,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:35,250 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:25:35,251 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:35,251 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1033569755] [2021-11-02 22:25:35,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1033569755] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:35,251 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [553087916] [2021-11-02 22:25:35,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:35,251 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:35,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:25:35,252 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:25:35,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-02 22:25:35,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:35,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-02 22:25:35,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:25:35,584 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:25:35,584 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-02 22:25:35,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-02 22:25:35,950 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:25:35,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [553087916] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:35,951 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:25:35,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 16 [2021-11-02 22:25:35,952 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1300486819] [2021-11-02 22:25:35,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-02 22:25:35,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:35,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-02 22:25:35,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=234, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:25:35,954 INFO L87 Difference]: Start difference. First operand 84 states and 101 transitions. Second operand has 17 states, 16 states have (on average 3.9375) internal successors, (63), 14 states have internal predecessors, (63), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:36,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:36,575 INFO L93 Difference]: Finished difference Result 100 states and 112 transitions. [2021-11-02 22:25:36,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:25:36,576 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 3.9375) internal successors, (63), 14 states have internal predecessors, (63), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-11-02 22:25:36,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:36,578 INFO L225 Difference]: With dead ends: 100 [2021-11-02 22:25:36,578 INFO L226 Difference]: Without dead ends: 100 [2021-11-02 22:25:36,578 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=111, Invalid=539, Unknown=0, NotChecked=0, Total=650 [2021-11-02 22:25:36,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-02 22:25:36,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 84. [2021-11-02 22:25:36,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 75 states have (on average 1.28) internal successors, (96), 79 states have internal predecessors, (96), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:36,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 100 transitions. [2021-11-02 22:25:36,582 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 100 transitions. Word has length 38 [2021-11-02 22:25:36,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:36,583 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 100 transitions. [2021-11-02 22:25:36,583 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 3.9375) internal successors, (63), 14 states have internal predecessors, (63), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:36,583 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 100 transitions. [2021-11-02 22:25:36,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-02 22:25:36,584 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:36,584 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:36,615 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-02 22:25:36,808 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:36,808 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:36,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:36,809 INFO L85 PathProgramCache]: Analyzing trace with hash -1181095848, now seen corresponding path program 2 times [2021-11-02 22:25:36,809 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:36,810 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [867998349] [2021-11-02 22:25:36,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:36,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:36,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:37,131 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:37,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:37,135 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:25:37,136 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:37,136 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [867998349] [2021-11-02 22:25:37,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [867998349] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:37,136 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1915802684] [2021-11-02 22:25:37,137 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:25:37,137 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:37,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:25:37,138 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:25:37,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-02 22:25:37,436 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:25:37,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:25:37,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-02 22:25:37,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:25:37,556 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-02 22:25:38,432 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:25:38,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 33 [2021-11-02 22:25:38,725 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:25:38,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1915802684] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:38,726 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:25:38,726 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 27 [2021-11-02 22:25:38,726 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755000287] [2021-11-02 22:25:38,726 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-02 22:25:38,727 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:38,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-02 22:25:38,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=635, Unknown=0, NotChecked=0, Total=702 [2021-11-02 22:25:38,728 INFO L87 Difference]: Start difference. First operand 84 states and 100 transitions. Second operand has 27 states, 25 states have (on average 2.8) internal successors, (70), 24 states have internal predecessors, (70), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:43,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:43,603 INFO L93 Difference]: Finished difference Result 193 states and 214 transitions. [2021-11-02 22:25:43,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-02 22:25:43,604 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 2.8) internal successors, (70), 24 states have internal predecessors, (70), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-11-02 22:25:43,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:43,606 INFO L225 Difference]: With dead ends: 193 [2021-11-02 22:25:43,606 INFO L226 Difference]: Without dead ends: 185 [2021-11-02 22:25:43,608 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 672 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=369, Invalid=2601, Unknown=0, NotChecked=0, Total=2970 [2021-11-02 22:25:43,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-11-02 22:25:43,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 129. [2021-11-02 22:25:43,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 119 states have (on average 1.2352941176470589) internal successors, (147), 123 states have internal predecessors, (147), 4 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:43,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 152 transitions. [2021-11-02 22:25:43,633 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 152 transitions. Word has length 41 [2021-11-02 22:25:43,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:43,633 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 152 transitions. [2021-11-02 22:25:43,635 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 2.8) internal successors, (70), 24 states have internal predecessors, (70), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:43,635 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 152 transitions. [2021-11-02 22:25:43,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-02 22:25:43,636 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:43,636 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:43,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-02 22:25:43,852 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-02 22:25:43,852 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:43,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:43,853 INFO L85 PathProgramCache]: Analyzing trace with hash -1692139569, now seen corresponding path program 1 times [2021-11-02 22:25:43,853 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:43,853 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [357410926] [2021-11-02 22:25:43,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:43,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:43,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:44,048 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:44,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:44,054 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:25:44,054 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:44,054 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [357410926] [2021-11-02 22:25:44,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [357410926] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:44,055 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1195854053] [2021-11-02 22:25:44,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:44,055 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:44,055 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:25:44,057 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:25:44,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-02 22:25:44,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:44,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-02 22:25:44,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:25:44,406 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:25:44,406 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-02 22:25:44,410 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-02 22:25:44,851 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:25:44,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1195854053] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:44,852 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:25:44,852 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 16 [2021-11-02 22:25:44,852 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229607765] [2021-11-02 22:25:44,852 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-02 22:25:44,853 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:44,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-02 22:25:44,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=234, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:25:44,854 INFO L87 Difference]: Start difference. First operand 129 states and 152 transitions. Second operand has 17 states, 16 states have (on average 3.9375) internal successors, (63), 14 states have internal predecessors, (63), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:45,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:45,551 INFO L93 Difference]: Finished difference Result 193 states and 220 transitions. [2021-11-02 22:25:45,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:25:45,552 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 3.9375) internal successors, (63), 14 states have internal predecessors, (63), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-11-02 22:25:45,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:45,554 INFO L225 Difference]: With dead ends: 193 [2021-11-02 22:25:45,554 INFO L226 Difference]: Without dead ends: 193 [2021-11-02 22:25:45,554 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=99, Invalid=501, Unknown=0, NotChecked=0, Total=600 [2021-11-02 22:25:45,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-11-02 22:25:45,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 141. [2021-11-02 22:25:45,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 131 states have (on average 1.213740458015267) internal successors, (159), 135 states have internal predecessors, (159), 4 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:45,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 164 transitions. [2021-11-02 22:25:45,561 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 164 transitions. Word has length 42 [2021-11-02 22:25:45,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:45,561 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 164 transitions. [2021-11-02 22:25:45,562 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 3.9375) internal successors, (63), 14 states have internal predecessors, (63), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:45,562 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 164 transitions. [2021-11-02 22:25:45,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-02 22:25:45,563 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:45,563 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:45,609 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-02 22:25:45,764 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-02 22:25:45,764 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:45,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:45,764 INFO L85 PathProgramCache]: Analyzing trace with hash 1777949011, now seen corresponding path program 2 times [2021-11-02 22:25:45,765 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:45,765 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [555711158] [2021-11-02 22:25:45,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:45,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:45,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:46,111 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:46,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:46,117 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:25:46,117 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:46,117 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [555711158] [2021-11-02 22:25:46,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [555711158] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:46,117 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [199829435] [2021-11-02 22:25:46,118 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:25:46,118 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:46,118 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:25:46,120 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:25:46,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-02 22:25:46,445 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:25:46,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:25:46,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-02 22:25:46,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:25:46,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:25:46,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-02 22:25:46,914 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-02 22:25:46,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-02 22:25:48,263 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-02 22:25:48,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 49 treesize of output 34 [2021-11-02 22:25:48,324 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:25:48,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [199829435] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:48,325 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:25:48,325 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 23 [2021-11-02 22:25:48,325 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148867097] [2021-11-02 22:25:48,326 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-02 22:25:48,326 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:48,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-02 22:25:48,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=448, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:25:48,327 INFO L87 Difference]: Start difference. First operand 141 states and 164 transitions. Second operand has 23 states, 22 states have (on average 3.272727272727273) internal successors, (72), 20 states have internal predecessors, (72), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:49,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:49,429 INFO L93 Difference]: Finished difference Result 220 states and 250 transitions. [2021-11-02 22:25:49,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 22:25:49,430 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 3.272727272727273) internal successors, (72), 20 states have internal predecessors, (72), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-11-02 22:25:49,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:49,431 INFO L225 Difference]: With dead ends: 220 [2021-11-02 22:25:49,431 INFO L226 Difference]: Without dead ends: 199 [2021-11-02 22:25:49,432 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=125, Invalid=805, Unknown=0, NotChecked=0, Total=930 [2021-11-02 22:25:49,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-11-02 22:25:49,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 189. [2021-11-02 22:25:49,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 178 states have (on average 1.202247191011236) internal successors, (214), 182 states have internal predecessors, (214), 5 states have call successors, (5), 5 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:49,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 220 transitions. [2021-11-02 22:25:49,442 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 220 transitions. Word has length 47 [2021-11-02 22:25:49,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:49,442 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 220 transitions. [2021-11-02 22:25:49,442 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 3.272727272727273) internal successors, (72), 20 states have internal predecessors, (72), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:49,443 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 220 transitions. [2021-11-02 22:25:49,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-02 22:25:49,444 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:49,444 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:49,477 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-02 22:25:49,656 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-02 22:25:49,656 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:49,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:49,657 INFO L85 PathProgramCache]: Analyzing trace with hash -1479203935, now seen corresponding path program 2 times [2021-11-02 22:25:49,657 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:49,657 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1884263775] [2021-11-02 22:25:49,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:49,657 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:49,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:50,416 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:50,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:50,421 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:25:50,421 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:50,421 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1884263775] [2021-11-02 22:25:50,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1884263775] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:50,421 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242251514] [2021-11-02 22:25:50,422 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:25:50,422 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:50,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:25:50,423 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:25:50,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-02 22:25:50,853 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:25:50,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:25:50,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-02 22:25:50,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:25:50,925 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:25:50,926 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:25:51,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-02 22:25:51,901 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-11-02 22:25:51,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 25 [2021-11-02 22:25:51,916 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:25:51,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1242251514] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:51,916 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:25:51,917 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 16] total 33 [2021-11-02 22:25:51,917 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129338735] [2021-11-02 22:25:51,917 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-02 22:25:51,917 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:51,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-02 22:25:51,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=969, Unknown=0, NotChecked=0, Total=1056 [2021-11-02 22:25:51,918 INFO L87 Difference]: Start difference. First operand 189 states and 220 transitions. Second operand has 33 states, 31 states have (on average 2.6451612903225805) internal successors, (82), 30 states have internal predecessors, (82), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:54,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:54,423 INFO L93 Difference]: Finished difference Result 294 states and 328 transitions. [2021-11-02 22:25:54,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-02 22:25:54,432 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 2.6451612903225805) internal successors, (82), 30 states have internal predecessors, (82), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-11-02 22:25:54,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:54,434 INFO L225 Difference]: With dead ends: 294 [2021-11-02 22:25:54,434 INFO L226 Difference]: Without dead ends: 265 [2021-11-02 22:25:54,437 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 813 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=435, Invalid=3471, Unknown=0, NotChecked=0, Total=3906 [2021-11-02 22:25:54,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2021-11-02 22:25:54,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 244. [2021-11-02 22:25:54,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 244 states, 232 states have (on average 1.1810344827586208) internal successors, (274), 236 states have internal predecessors, (274), 6 states have call successors, (6), 6 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:54,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 281 transitions. [2021-11-02 22:25:54,447 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 281 transitions. Word has length 49 [2021-11-02 22:25:54,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:54,448 INFO L470 AbstractCegarLoop]: Abstraction has 244 states and 281 transitions. [2021-11-02 22:25:54,448 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 2.6451612903225805) internal successors, (82), 30 states have internal predecessors, (82), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:54,449 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 281 transitions. [2021-11-02 22:25:54,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-02 22:25:54,450 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:54,450 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:54,488 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-02 22:25:54,670 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:54,670 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:54,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:54,670 INFO L85 PathProgramCache]: Analyzing trace with hash -426369642, now seen corresponding path program 3 times [2021-11-02 22:25:54,671 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:54,671 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265077053] [2021-11-02 22:25:54,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:54,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:54,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:54,899 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:54,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:54,904 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:25:54,904 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:54,904 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1265077053] [2021-11-02 22:25:54,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1265077053] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:54,905 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302573191] [2021-11-02 22:25:54,905 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:25:54,905 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:54,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:25:54,909 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:25:54,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-02 22:25:55,422 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-02 22:25:55,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:25:55,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-02 22:25:55,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:25:55,853 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:25:55,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [302573191] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:55,853 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:25:55,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-11-02 22:25:55,854 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129737513] [2021-11-02 22:25:55,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-02 22:25:55,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:55,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-02 22:25:55,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-11-02 22:25:55,856 INFO L87 Difference]: Start difference. First operand 244 states and 281 transitions. Second operand has 21 states, 20 states have (on average 4.5) internal successors, (90), 18 states have internal predecessors, (90), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:56,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:56,668 INFO L93 Difference]: Finished difference Result 383 states and 433 transitions. [2021-11-02 22:25:56,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 22:25:56,669 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 4.5) internal successors, (90), 18 states have internal predecessors, (90), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-11-02 22:25:56,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:56,672 INFO L225 Difference]: With dead ends: 383 [2021-11-02 22:25:56,672 INFO L226 Difference]: Without dead ends: 383 [2021-11-02 22:25:56,673 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=130, Invalid=682, Unknown=0, NotChecked=0, Total=812 [2021-11-02 22:25:56,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2021-11-02 22:25:56,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 288. [2021-11-02 22:25:56,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 276 states have (on average 1.1992753623188406) internal successors, (331), 280 states have internal predecessors, (331), 6 states have call successors, (6), 6 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:56,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 338 transitions. [2021-11-02 22:25:56,686 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 338 transitions. Word has length 51 [2021-11-02 22:25:56,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:56,687 INFO L470 AbstractCegarLoop]: Abstraction has 288 states and 338 transitions. [2021-11-02 22:25:56,687 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 4.5) internal successors, (90), 18 states have internal predecessors, (90), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:25:56,687 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 338 transitions. [2021-11-02 22:25:56,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-02 22:25:56,688 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:56,689 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:56,734 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-02 22:25:56,900 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-02 22:25:56,900 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:25:56,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:56,901 INFO L85 PathProgramCache]: Analyzing trace with hash -1427061148, now seen corresponding path program 3 times [2021-11-02 22:25:56,904 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:56,904 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135683850] [2021-11-02 22:25:56,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:56,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:56,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:57,545 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:57,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:57,550 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 10 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:25:57,550 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:57,550 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135683850] [2021-11-02 22:25:57,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135683850] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:57,550 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2026193830] [2021-11-02 22:25:57,551 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:25:57,551 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:57,551 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:25:57,553 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:25:57,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-02 22:25:58,012 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-02 22:25:58,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:25:58,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-02 22:25:58,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:25:58,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:25:58,562 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-02 22:25:58,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-02 22:26:00,562 INFO L354 Elim1Store]: treesize reduction 71, result has 14.5 percent of original size [2021-11-02 22:26:00,562 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 64 treesize of output 49 [2021-11-02 22:26:00,674 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 10 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:26:00,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2026193830] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:00,675 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:26:00,675 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19] total 35 [2021-11-02 22:26:00,675 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996135687] [2021-11-02 22:26:00,676 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-02 22:26:00,676 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:26:00,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-02 22:26:00,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=1093, Unknown=0, NotChecked=0, Total=1190 [2021-11-02 22:26:00,677 INFO L87 Difference]: Start difference. First operand 288 states and 338 transitions. Second operand has 35 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 32 states have internal predecessors, (73), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:26:04,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:26:04,970 INFO L93 Difference]: Finished difference Result 277 states and 320 transitions. [2021-11-02 22:26:04,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-02 22:26:04,970 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 32 states have internal predecessors, (73), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-11-02 22:26:04,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:26:04,972 INFO L225 Difference]: With dead ends: 277 [2021-11-02 22:26:04,973 INFO L226 Difference]: Without dead ends: 243 [2021-11-02 22:26:04,974 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 492 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=315, Invalid=2337, Unknown=0, NotChecked=0, Total=2652 [2021-11-02 22:26:04,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-11-02 22:26:04,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 240. [2021-11-02 22:26:04,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 240 states, 229 states have (on average 1.205240174672489) internal successors, (276), 233 states have internal predecessors, (276), 5 states have call successors, (5), 5 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:26:04,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 282 transitions. [2021-11-02 22:26:04,984 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 282 transitions. Word has length 53 [2021-11-02 22:26:04,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:26:04,985 INFO L470 AbstractCegarLoop]: Abstraction has 240 states and 282 transitions. [2021-11-02 22:26:04,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 32 states have internal predecessors, (73), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:26:04,985 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 282 transitions. [2021-11-02 22:26:04,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-02 22:26:04,987 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:26:04,987 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:26:05,021 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-02 22:26:05,200 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:26:05,200 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:26:05,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:26:05,201 INFO L85 PathProgramCache]: Analyzing trace with hash 1459939393, now seen corresponding path program 2 times [2021-11-02 22:26:05,201 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:26:05,201 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215214164] [2021-11-02 22:26:05,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:26:05,201 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:26:05,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:05,325 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:26:05,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:05,332 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 23 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-02 22:26:05,332 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:26:05,332 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215214164] [2021-11-02 22:26:05,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [215214164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:05,333 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [649936596] [2021-11-02 22:26:05,333 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:26:05,333 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:26:05,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:26:05,337 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:26:05,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-02 22:26:05,816 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-02 22:26:05,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:26:05,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-02 22:26:05,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:26:06,033 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-02 22:26:06,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [649936596] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:26:06,033 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:26:06,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [9] total 11 [2021-11-02 22:26:06,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694217573] [2021-11-02 22:26:06,034 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:26:06,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:26:06,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:26:06,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:26:06,036 INFO L87 Difference]: Start difference. First operand 240 states and 282 transitions. Second operand has 4 states, 3 states have (on average 12.666666666666666) internal successors, (38), 4 states have internal predecessors, (38), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:26:06,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:26:06,097 INFO L93 Difference]: Finished difference Result 241 states and 279 transitions. [2021-11-02 22:26:06,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:26:06,097 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 12.666666666666666) internal successors, (38), 4 states have internal predecessors, (38), 1 states have call successors, (3), 1 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 57 [2021-11-02 22:26:06,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:26:06,099 INFO L225 Difference]: With dead ends: 241 [2021-11-02 22:26:06,099 INFO L226 Difference]: Without dead ends: 241 [2021-11-02 22:26:06,100 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:26:06,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2021-11-02 22:26:06,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 240. [2021-11-02 22:26:06,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 240 states, 229 states have (on average 1.1921397379912664) internal successors, (273), 233 states have internal predecessors, (273), 5 states have call successors, (5), 5 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:26:06,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 279 transitions. [2021-11-02 22:26:06,108 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 279 transitions. Word has length 57 [2021-11-02 22:26:06,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:26:06,109 INFO L470 AbstractCegarLoop]: Abstraction has 240 states and 279 transitions. [2021-11-02 22:26:06,109 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 12.666666666666666) internal successors, (38), 4 states have internal predecessors, (38), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:26:06,109 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 279 transitions. [2021-11-02 22:26:06,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-02 22:26:06,111 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:26:06,111 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:26:06,149 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-02 22:26:06,324 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:26:06,324 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:26:06,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:26:06,325 INFO L85 PathProgramCache]: Analyzing trace with hash -1956893617, now seen corresponding path program 1 times [2021-11-02 22:26:06,325 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:26:06,325 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1582316644] [2021-11-02 22:26:06,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:26:06,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:26:06,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:06,564 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:26:06,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:06,569 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:26:06,569 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:26:06,569 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1582316644] [2021-11-02 22:26:06,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1582316644] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:06,569 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1215832176] [2021-11-02 22:26:06,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:26:06,570 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:26:06,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:26:06,576 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:26:06,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-02 22:26:07,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:07,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-02 22:26:07,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:26:07,488 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 1 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:26:07,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1215832176] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:07,488 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:26:07,488 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-11-02 22:26:07,489 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834857398] [2021-11-02 22:26:07,489 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-02 22:26:07,489 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:26:07,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-02 22:26:07,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=297, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:26:07,490 INFO L87 Difference]: Start difference. First operand 240 states and 279 transitions. Second operand has 19 states, 18 states have (on average 4.444444444444445) internal successors, (80), 16 states have internal predecessors, (80), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:26:08,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:26:08,084 INFO L93 Difference]: Finished difference Result 266 states and 295 transitions. [2021-11-02 22:26:08,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-02 22:26:08,085 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 4.444444444444445) internal successors, (80), 16 states have internal predecessors, (80), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-11-02 22:26:08,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:26:08,087 INFO L225 Difference]: With dead ends: 266 [2021-11-02 22:26:08,087 INFO L226 Difference]: Without dead ends: 266 [2021-11-02 22:26:08,088 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=117, Invalid=639, Unknown=0, NotChecked=0, Total=756 [2021-11-02 22:26:08,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-11-02 22:26:08,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 240. [2021-11-02 22:26:08,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 240 states, 229 states have (on average 1.1834061135371179) internal successors, (271), 233 states have internal predecessors, (271), 5 states have call successors, (5), 5 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:26:08,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 277 transitions. [2021-11-02 22:26:08,098 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 277 transitions. Word has length 57 [2021-11-02 22:26:08,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:26:08,099 INFO L470 AbstractCegarLoop]: Abstraction has 240 states and 277 transitions. [2021-11-02 22:26:08,099 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 4.444444444444445) internal successors, (80), 16 states have internal predecessors, (80), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:26:08,099 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 277 transitions. [2021-11-02 22:26:08,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-02 22:26:08,101 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:26:08,101 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:26:08,153 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-02 22:26:08,324 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-02 22:26:08,324 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:26:08,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:26:08,325 INFO L85 PathProgramCache]: Analyzing trace with hash 1613499495, now seen corresponding path program 4 times [2021-11-02 22:26:08,325 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:26:08,325 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [520588550] [2021-11-02 22:26:08,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:26:08,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:26:08,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:08,532 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:26:08,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:08,543 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:26:08,544 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:26:08,544 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [520588550] [2021-11-02 22:26:08,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [520588550] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:08,545 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47963740] [2021-11-02 22:26:08,545 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:26:08,545 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:26:08,545 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:26:08,557 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:26:08,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-02 22:26:09,130 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:26:09,130 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:26:09,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-02 22:26:09,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:26:09,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:26:09,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-02 22:26:09,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-02 22:26:09,602 INFO L354 Elim1Store]: treesize reduction 47, result has 19.0 percent of original size [2021-11-02 22:26:09,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 31 [2021-11-02 22:26:10,596 INFO L354 Elim1Store]: treesize reduction 43, result has 55.2 percent of original size [2021-11-02 22:26:10,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 50 treesize of output 73 [2021-11-02 22:26:10,875 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-02 22:26:10,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47963740] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:10,876 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:26:10,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 25 [2021-11-02 22:26:10,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966522520] [2021-11-02 22:26:10,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-02 22:26:10,877 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:26:10,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-02 22:26:10,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=585, Unknown=0, NotChecked=0, Total=650 [2021-11-02 22:26:10,878 INFO L87 Difference]: Start difference. First operand 240 states and 277 transitions. Second operand has 26 states, 24 states have (on average 3.2083333333333335) internal successors, (77), 23 states have internal predecessors, (77), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:26:37,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:26:37,454 INFO L93 Difference]: Finished difference Result 282 states and 309 transitions. [2021-11-02 22:26:37,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-02 22:26:37,454 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 3.2083333333333335) internal successors, (77), 23 states have internal predecessors, (77), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-11-02 22:26:37,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:26:37,456 INFO L225 Difference]: With dead ends: 282 [2021-11-02 22:26:37,456 INFO L226 Difference]: Without dead ends: 282 [2021-11-02 22:26:37,458 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 900 ImplicationChecksByTransitivity, 23.9s TimeCoverageRelationStatistics Valid=938, Invalid=4032, Unknown=0, NotChecked=0, Total=4970 [2021-11-02 22:26:37,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2021-11-02 22:26:37,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 240. [2021-11-02 22:26:37,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 240 states, 229 states have (on average 1.1572052401746724) internal successors, (265), 233 states have internal predecessors, (265), 5 states have call successors, (5), 5 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:26:37,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 271 transitions. [2021-11-02 22:26:37,468 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 271 transitions. Word has length 57 [2021-11-02 22:26:37,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:26:37,468 INFO L470 AbstractCegarLoop]: Abstraction has 240 states and 271 transitions. [2021-11-02 22:26:37,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 3.2083333333333335) internal successors, (77), 23 states have internal predecessors, (77), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:26:37,469 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 271 transitions. [2021-11-02 22:26:37,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-02 22:26:37,470 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:26:37,470 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:26:37,527 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-02 22:26:37,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-02 22:26:37,688 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:26:37,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:26:37,689 INFO L85 PathProgramCache]: Analyzing trace with hash -1510482325, now seen corresponding path program 3 times [2021-11-02 22:26:37,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:26:37,689 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650780115] [2021-11-02 22:26:37,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:26:37,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:26:37,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:37,979 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:26:37,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:37,983 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 1 proven. 38 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:26:37,984 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:26:37,984 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650780115] [2021-11-02 22:26:37,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650780115] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:37,984 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1556439525] [2021-11-02 22:26:37,984 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:26:37,984 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:26:37,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:26:37,989 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:26:38,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-02 22:26:38,785 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-02 22:26:38,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:26:38,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-02 22:26:38,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:26:39,201 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 33 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:26:39,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1556439525] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:39,204 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:26:39,204 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 26 [2021-11-02 22:26:39,205 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592900724] [2021-11-02 22:26:39,205 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-02 22:26:39,206 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:26:39,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-02 22:26:39,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2021-11-02 22:26:39,207 INFO L87 Difference]: Start difference. First operand 240 states and 271 transitions. Second operand has 27 states, 24 states have (on average 4.166666666666667) internal successors, (100), 24 states have internal predecessors, (100), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:26:40,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:26:40,059 INFO L93 Difference]: Finished difference Result 310 states and 344 transitions. [2021-11-02 22:26:40,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-02 22:26:40,060 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 24 states have (on average 4.166666666666667) internal successors, (100), 24 states have internal predecessors, (100), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 60 [2021-11-02 22:26:40,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:26:40,062 INFO L225 Difference]: With dead ends: 310 [2021-11-02 22:26:40,062 INFO L226 Difference]: Without dead ends: 308 [2021-11-02 22:26:40,063 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=164, Invalid=958, Unknown=0, NotChecked=0, Total=1122 [2021-11-02 22:26:40,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2021-11-02 22:26:40,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 261. [2021-11-02 22:26:40,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 250 states have (on average 1.156) internal successors, (289), 254 states have internal predecessors, (289), 5 states have call successors, (5), 5 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:26:40,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 295 transitions. [2021-11-02 22:26:40,073 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 295 transitions. Word has length 60 [2021-11-02 22:26:40,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:26:40,074 INFO L470 AbstractCegarLoop]: Abstraction has 261 states and 295 transitions. [2021-11-02 22:26:40,074 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 24 states have (on average 4.166666666666667) internal successors, (100), 24 states have internal predecessors, (100), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:26:40,074 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 295 transitions. [2021-11-02 22:26:40,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-02 22:26:40,076 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:26:40,076 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:26:40,122 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-02 22:26:40,300 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-02 22:26:40,300 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:26:40,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:26:40,301 INFO L85 PathProgramCache]: Analyzing trace with hash -1057888223, now seen corresponding path program 4 times [2021-11-02 22:26:40,301 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:26:40,301 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [372108515] [2021-11-02 22:26:40,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:26:40,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:26:40,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:41,075 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:26:41,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:41,081 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 21 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:26:41,081 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:26:41,081 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [372108515] [2021-11-02 22:26:41,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [372108515] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:41,082 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1690306753] [2021-11-02 22:26:41,082 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:26:41,082 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:26:41,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:26:41,084 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:26:41,112 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-02 22:26:41,887 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:26:41,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:26:41,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-02 22:26:41,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:26:41,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:26:41,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-02 22:26:42,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-02 22:26:42,526 INFO L354 Elim1Store]: treesize reduction 47, result has 19.0 percent of original size [2021-11-02 22:26:42,526 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 31 [2021-11-02 22:26:43,609 INFO L354 Elim1Store]: treesize reduction 39, result has 23.5 percent of original size [2021-11-02 22:26:43,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 26 [2021-11-02 22:26:43,780 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 24 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:26:43,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1690306753] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:43,780 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:26:43,780 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 15] total 32 [2021-11-02 22:26:43,780 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164482709] [2021-11-02 22:26:43,781 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-02 22:26:43,781 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:26:43,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-02 22:26:43,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=909, Unknown=0, NotChecked=0, Total=992 [2021-11-02 22:26:43,782 INFO L87 Difference]: Start difference. First operand 261 states and 295 transitions. Second operand has 32 states, 30 states have (on average 3.566666666666667) internal successors, (107), 29 states have internal predecessors, (107), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:26:58,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:26:58,554 INFO L93 Difference]: Finished difference Result 448 states and 497 transitions. [2021-11-02 22:26:58,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-02 22:26:58,554 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 3.566666666666667) internal successors, (107), 29 states have internal predecessors, (107), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-11-02 22:26:58,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:26:58,556 INFO L225 Difference]: With dead ends: 448 [2021-11-02 22:26:58,556 INFO L226 Difference]: Without dead ends: 374 [2021-11-02 22:26:58,558 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=343, Invalid=2849, Unknown=0, NotChecked=0, Total=3192 [2021-11-02 22:26:58,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2021-11-02 22:26:58,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 360. [2021-11-02 22:26:58,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 348 states have (on average 1.1551724137931034) internal successors, (402), 352 states have internal predecessors, (402), 6 states have call successors, (6), 6 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:26:58,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 409 transitions. [2021-11-02 22:26:58,568 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 409 transitions. Word has length 62 [2021-11-02 22:26:58,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:26:58,568 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 409 transitions. [2021-11-02 22:26:58,569 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 3.566666666666667) internal successors, (107), 29 states have internal predecessors, (107), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:26:58,569 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 409 transitions. [2021-11-02 22:26:58,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-02 22:26:58,570 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:26:58,570 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:26:58,620 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-02 22:26:58,791 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-02 22:26:58,792 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:26:58,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:26:58,792 INFO L85 PathProgramCache]: Analyzing trace with hash -1344162434, now seen corresponding path program 5 times [2021-11-02 22:26:58,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:26:58,792 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [72489700] [2021-11-02 22:26:58,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:26:58,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:26:58,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:58,977 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:26:58,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:58,981 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 1 proven. 50 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:26:58,981 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:26:58,981 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [72489700] [2021-11-02 22:26:58,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [72489700] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:58,982 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1091101250] [2021-11-02 22:26:58,982 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:26:58,982 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:26:58,982 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:26:58,984 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:26:59,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-02 22:26:59,668 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-02 22:26:59,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:26:59,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-02 22:26:59,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:26:59,714 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:26:59,714 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-02 22:26:59,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-02 22:27:00,207 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 6 proven. 45 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:27:00,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1091101250] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:27:00,207 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:27:00,207 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 18 [2021-11-02 22:27:00,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333951057] [2021-11-02 22:27:00,208 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-02 22:27:00,208 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:27:00,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-02 22:27:00,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=297, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:27:00,209 INFO L87 Difference]: Start difference. First operand 360 states and 409 transitions. Second operand has 19 states, 18 states have (on average 6.0) internal successors, (108), 17 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:27:00,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:27:00,899 INFO L93 Difference]: Finished difference Result 522 states and 578 transitions. [2021-11-02 22:27:00,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:27:00,899 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 6.0) internal successors, (108), 17 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 66 [2021-11-02 22:27:00,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:27:00,902 INFO L225 Difference]: With dead ends: 522 [2021-11-02 22:27:00,902 INFO L226 Difference]: Without dead ends: 522 [2021-11-02 22:27:00,903 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=561, Unknown=0, NotChecked=0, Total=650 [2021-11-02 22:27:00,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2021-11-02 22:27:00,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 429. [2021-11-02 22:27:00,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 429 states, 417 states have (on average 1.158273381294964) internal successors, (483), 421 states have internal predecessors, (483), 6 states have call successors, (6), 6 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:27:00,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 490 transitions. [2021-11-02 22:27:00,915 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 490 transitions. Word has length 66 [2021-11-02 22:27:00,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:27:00,915 INFO L470 AbstractCegarLoop]: Abstraction has 429 states and 490 transitions. [2021-11-02 22:27:00,915 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 6.0) internal successors, (108), 17 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:27:00,916 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 490 transitions. [2021-11-02 22:27:00,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-02 22:27:00,917 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:27:00,917 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:27:00,956 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-02 22:27:01,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:27:01,141 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:27:01,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:27:01,142 INFO L85 PathProgramCache]: Analyzing trace with hash -322835807, now seen corresponding path program 4 times [2021-11-02 22:27:01,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:27:01,142 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1239390556] [2021-11-02 22:27:01,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:27:01,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:27:01,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:01,334 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:27:01,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:01,337 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 27 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:27:01,338 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:27:01,338 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1239390556] [2021-11-02 22:27:01,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1239390556] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:27:01,339 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [797737833] [2021-11-02 22:27:01,339 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:27:01,339 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:27:01,339 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:27:01,344 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:27:01,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-02 22:27:02,024 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:27:02,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:27:02,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-02 22:27:02,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:27:02,059 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:27:02,059 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-02 22:27:02,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-02 22:27:02,505 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 46 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:27:02,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [797737833] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:27:02,505 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:27:02,505 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 25 [2021-11-02 22:27:02,505 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721476625] [2021-11-02 22:27:02,506 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-02 22:27:02,506 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:27:02,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-02 22:27:02,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2021-11-02 22:27:02,507 INFO L87 Difference]: Start difference. First operand 429 states and 490 transitions. Second operand has 25 states, 25 states have (on average 4.12) internal successors, (103), 22 states have internal predecessors, (103), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:27:03,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:27:03,204 INFO L93 Difference]: Finished difference Result 421 states and 470 transitions. [2021-11-02 22:27:03,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-02 22:27:03,205 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 4.12) internal successors, (103), 22 states have internal predecessors, (103), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-11-02 22:27:03,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:27:03,207 INFO L225 Difference]: With dead ends: 421 [2021-11-02 22:27:03,207 INFO L226 Difference]: Without dead ends: 337 [2021-11-02 22:27:03,207 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 218 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=258, Invalid=1148, Unknown=0, NotChecked=0, Total=1406 [2021-11-02 22:27:03,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2021-11-02 22:27:03,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 334. [2021-11-02 22:27:03,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 323 states have (on average 1.1578947368421053) internal successors, (374), 327 states have internal predecessors, (374), 5 states have call successors, (5), 5 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:27:03,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 380 transitions. [2021-11-02 22:27:03,217 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 380 transitions. Word has length 67 [2021-11-02 22:27:03,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:27:03,217 INFO L470 AbstractCegarLoop]: Abstraction has 334 states and 380 transitions. [2021-11-02 22:27:03,217 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 4.12) internal successors, (103), 22 states have internal predecessors, (103), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:27:03,218 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 380 transitions. [2021-11-02 22:27:03,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-02 22:27:03,219 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:27:03,219 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:27:03,262 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-02 22:27:03,440 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-02 22:27:03,440 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:27:03,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:27:03,441 INFO L85 PathProgramCache]: Analyzing trace with hash 1801252708, now seen corresponding path program 5 times [2021-11-02 22:27:03,441 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:27:03,441 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172260360] [2021-11-02 22:27:03,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:27:03,441 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:27:03,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:04,552 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:27:04,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:04,556 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 16 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:27:04,556 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:27:04,556 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172260360] [2021-11-02 22:27:04,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172260360] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:27:04,557 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [140696451] [2021-11-02 22:27:04,557 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:27:04,557 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:27:04,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:27:04,558 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:27:04,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-02 22:27:05,602 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-02 22:27:05,602 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:27:05,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-02 22:27:05,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:27:05,902 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-02 22:27:06,322 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-02 22:27:06,337 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:27:06,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [140696451] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:27:06,337 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:27:06,337 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 17] total 35 [2021-11-02 22:27:06,337 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764222625] [2021-11-02 22:27:06,338 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-02 22:27:06,338 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:27:06,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-02 22:27:06,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=1104, Unknown=0, NotChecked=0, Total=1190 [2021-11-02 22:27:06,339 INFO L87 Difference]: Start difference. First operand 334 states and 380 transitions. Second operand has 35 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:27:09,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:27:09,551 INFO L93 Difference]: Finished difference Result 680 states and 750 transitions. [2021-11-02 22:27:09,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-02 22:27:09,556 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2021-11-02 22:27:09,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:27:09,562 INFO L225 Difference]: With dead ends: 680 [2021-11-02 22:27:09,562 INFO L226 Difference]: Without dead ends: 656 [2021-11-02 22:27:09,564 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 634 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=365, Invalid=3667, Unknown=0, NotChecked=0, Total=4032 [2021-11-02 22:27:09,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 656 states. [2021-11-02 22:27:09,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 656 to 443. [2021-11-02 22:27:09,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 443 states, 431 states have (on average 1.1461716937354989) internal successors, (494), 435 states have internal predecessors, (494), 6 states have call successors, (6), 6 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:27:09,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 443 states to 443 states and 501 transitions. [2021-11-02 22:27:09,580 INFO L78 Accepts]: Start accepts. Automaton has 443 states and 501 transitions. Word has length 71 [2021-11-02 22:27:09,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:27:09,581 INFO L470 AbstractCegarLoop]: Abstraction has 443 states and 501 transitions. [2021-11-02 22:27:09,581 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:27:09,581 INFO L276 IsEmpty]: Start isEmpty. Operand 443 states and 501 transitions. [2021-11-02 22:27:09,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-02 22:27:09,582 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:27:09,582 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:27:09,624 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-02 22:27:09,796 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-02 22:27:09,796 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:27:09,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:27:09,797 INFO L85 PathProgramCache]: Analyzing trace with hash -1648662191, now seen corresponding path program 2 times [2021-11-02 22:27:09,797 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:27:09,797 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577728354] [2021-11-02 22:27:09,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:27:09,797 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:27:09,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:10,056 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:27:10,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:10,060 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 1 proven. 58 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:27:10,060 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:27:10,060 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577728354] [2021-11-02 22:27:10,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1577728354] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:27:10,060 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2143845247] [2021-11-02 22:27:10,060 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:27:10,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:27:10,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:27:10,062 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:27:10,086 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-02 22:27:10,937 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:27:10,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:27:10,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-02 22:27:10,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:27:10,981 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:27:10,981 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-02 22:27:10,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-02 22:27:11,700 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 6 proven. 53 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:27:11,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2143845247] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:27:11,700 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:27:11,700 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 23 [2021-11-02 22:27:11,701 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266604401] [2021-11-02 22:27:11,701 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-02 22:27:11,701 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:27:11,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-02 22:27:11,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=496, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:27:11,702 INFO L87 Difference]: Start difference. First operand 443 states and 501 transitions. Second operand has 24 states, 23 states have (on average 5.0) internal successors, (115), 21 states have internal predecessors, (115), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:27:12,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:27:12,483 INFO L93 Difference]: Finished difference Result 480 states and 526 transitions. [2021-11-02 22:27:12,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-02 22:27:12,484 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 5.0) internal successors, (115), 21 states have internal predecessors, (115), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 72 [2021-11-02 22:27:12,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:27:12,486 INFO L225 Difference]: With dead ends: 480 [2021-11-02 22:27:12,487 INFO L226 Difference]: Without dead ends: 480 [2021-11-02 22:27:12,487 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=154, Invalid=1106, Unknown=0, NotChecked=0, Total=1260 [2021-11-02 22:27:12,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 480 states. [2021-11-02 22:27:12,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 480 to 443. [2021-11-02 22:27:12,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 443 states, 431 states have (on average 1.1392111368909512) internal successors, (491), 435 states have internal predecessors, (491), 6 states have call successors, (6), 6 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:27:12,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 443 states to 443 states and 498 transitions. [2021-11-02 22:27:12,499 INFO L78 Accepts]: Start accepts. Automaton has 443 states and 498 transitions. Word has length 72 [2021-11-02 22:27:12,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:27:12,499 INFO L470 AbstractCegarLoop]: Abstraction has 443 states and 498 transitions. [2021-11-02 22:27:12,500 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 5.0) internal successors, (115), 21 states have internal predecessors, (115), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:27:12,500 INFO L276 IsEmpty]: Start isEmpty. Operand 443 states and 498 transitions. [2021-11-02 22:27:12,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-02 22:27:12,501 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:27:12,501 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:27:12,543 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-02 22:27:12,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:27:12,728 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:27:12,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:27:12,729 INFO L85 PathProgramCache]: Analyzing trace with hash -1144910361, now seen corresponding path program 6 times [2021-11-02 22:27:12,729 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:27:12,729 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355699277] [2021-11-02 22:27:12,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:27:12,729 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:27:12,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:13,012 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:27:13,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:13,016 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 6 proven. 68 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:27:13,016 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:27:13,017 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1355699277] [2021-11-02 22:27:13,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1355699277] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:27:13,017 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1435417084] [2021-11-02 22:27:13,017 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:27:13,017 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:27:13,017 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:27:13,020 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:27:13,042 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-02 22:27:14,114 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-02 22:27:14,114 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:27:14,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-02 22:27:14,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:27:14,147 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:27:14,147 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:27:14,860 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 15 proven. 59 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:27:14,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1435417084] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:27:14,860 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:27:14,860 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 30 [2021-11-02 22:27:14,860 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13316301] [2021-11-02 22:27:14,860 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-02 22:27:14,861 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:27:14,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-02 22:27:14,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=820, Unknown=0, NotChecked=0, Total=930 [2021-11-02 22:27:14,862 INFO L87 Difference]: Start difference. First operand 443 states and 498 transitions. Second operand has 31 states, 29 states have (on average 4.206896551724138) internal successors, (122), 28 states have internal predecessors, (122), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:27:15,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:27:15,884 INFO L93 Difference]: Finished difference Result 551 states and 611 transitions. [2021-11-02 22:27:15,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-02 22:27:15,884 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 4.206896551724138) internal successors, (122), 28 states have internal predecessors, (122), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2021-11-02 22:27:15,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:27:15,887 INFO L225 Difference]: With dead ends: 551 [2021-11-02 22:27:15,887 INFO L226 Difference]: Without dead ends: 549 [2021-11-02 22:27:15,888 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=205, Invalid=1277, Unknown=0, NotChecked=0, Total=1482 [2021-11-02 22:27:15,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 549 states. [2021-11-02 22:27:15,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 549 to 471. [2021-11-02 22:27:15,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 459 states have (on average 1.1394335511982572) internal successors, (523), 463 states have internal predecessors, (523), 6 states have call successors, (6), 6 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:27:15,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 530 transitions. [2021-11-02 22:27:15,901 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 530 transitions. Word has length 75 [2021-11-02 22:27:15,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:27:15,901 INFO L470 AbstractCegarLoop]: Abstraction has 471 states and 530 transitions. [2021-11-02 22:27:15,901 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 4.206896551724138) internal successors, (122), 28 states have internal predecessors, (122), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:27:15,902 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 530 transitions. [2021-11-02 22:27:15,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-02 22:27:15,903 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:27:15,903 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:27:15,944 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-02 22:27:16,116 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:27:16,116 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:27:16,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:27:16,117 INFO L85 PathProgramCache]: Analyzing trace with hash -1940926663, now seen corresponding path program 6 times [2021-11-02 22:27:16,117 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:27:16,117 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1566218015] [2021-11-02 22:27:16,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:27:16,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:27:16,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:16,433 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:27:16,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:16,446 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 31 proven. 54 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:27:16,447 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:27:16,447 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1566218015] [2021-11-02 22:27:16,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1566218015] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:27:16,447 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [538837623] [2021-11-02 22:27:16,447 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:27:16,448 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:27:16,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:27:16,464 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:27:16,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-02 22:27:17,330 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-02 22:27:17,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:27:17,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-02 22:27:17,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:27:17,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:27:17,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-02 22:27:17,727 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-02 22:27:17,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-02 22:27:19,015 INFO L354 Elim1Store]: treesize reduction 77, result has 9.4 percent of original size [2021-11-02 22:27:19,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 48 treesize of output 31 [2021-11-02 22:27:19,042 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 41 proven. 44 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:27:19,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [538837623] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:27:19,043 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:27:19,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18] total 31 [2021-11-02 22:27:19,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098097021] [2021-11-02 22:27:19,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-02 22:27:19,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:27:19,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-02 22:27:19,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=853, Unknown=0, NotChecked=0, Total=930 [2021-11-02 22:27:19,045 INFO L87 Difference]: Start difference. First operand 471 states and 530 transitions. Second operand has 31 states, 30 states have (on average 4.366666666666666) internal successors, (131), 28 states have internal predecessors, (131), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:28:20,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:28:20,995 INFO L93 Difference]: Finished difference Result 838 states and 928 transitions. [2021-11-02 22:28:20,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-02 22:28:20,996 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 4.366666666666666) internal successors, (131), 28 states have internal predecessors, (131), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-11-02 22:28:20,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:28:21,000 INFO L225 Difference]: With dead ends: 838 [2021-11-02 22:28:21,000 INFO L226 Difference]: Without dead ends: 654 [2021-11-02 22:28:21,001 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 25.3s TimeCoverageRelationStatistics Valid=187, Invalid=1783, Unknown=10, NotChecked=0, Total=1980 [2021-11-02 22:28:21,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 654 states. [2021-11-02 22:28:21,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 654 to 635. [2021-11-02 22:28:21,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 635 states, 622 states have (on average 1.144694533762058) internal successors, (712), 626 states have internal predecessors, (712), 7 states have call successors, (7), 7 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:28:21,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 635 states to 635 states and 720 transitions. [2021-11-02 22:28:21,032 INFO L78 Accepts]: Start accepts. Automaton has 635 states and 720 transitions. Word has length 77 [2021-11-02 22:28:21,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:28:21,033 INFO L470 AbstractCegarLoop]: Abstraction has 635 states and 720 transitions. [2021-11-02 22:28:21,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 4.366666666666666) internal successors, (131), 28 states have internal predecessors, (131), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:28:21,033 INFO L276 IsEmpty]: Start isEmpty. Operand 635 states and 720 transitions. [2021-11-02 22:28:21,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-02 22:28:21,035 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:28:21,035 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:28:21,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-02 22:28:21,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-11-02 22:28:21,244 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:28:21,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:28:21,245 INFO L85 PathProgramCache]: Analyzing trace with hash -1037435844, now seen corresponding path program 7 times [2021-11-02 22:28:21,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:28:21,245 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2058492006] [2021-11-02 22:28:21,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:28:21,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:28:21,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:28:21,509 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:28:21,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:28:21,512 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 6 proven. 92 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:28:21,513 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:28:21,513 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2058492006] [2021-11-02 22:28:21,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2058492006] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:28:21,513 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [490623619] [2021-11-02 22:28:21,513 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:28:21,513 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:28:21,514 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:28:21,515 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:28:21,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-02 22:28:22,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:28:22,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-02 22:28:22,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:28:23,050 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 15 proven. 83 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:28:23,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [490623619] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:28:23,050 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:28:23,051 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2021-11-02 22:28:23,051 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044030590] [2021-11-02 22:28:23,051 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-02 22:28:23,051 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:28:23,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-02 22:28:23,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:28:23,052 INFO L87 Difference]: Start difference. First operand 635 states and 720 transitions. Second operand has 24 states, 23 states have (on average 5.043478260869565) internal successors, (116), 21 states have internal predecessors, (116), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:28:23,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:28:23,918 INFO L93 Difference]: Finished difference Result 865 states and 962 transitions. [2021-11-02 22:28:23,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-02 22:28:23,918 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 5.043478260869565) internal successors, (116), 21 states have internal predecessors, (116), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2021-11-02 22:28:23,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:28:23,922 INFO L225 Difference]: With dead ends: 865 [2021-11-02 22:28:23,922 INFO L226 Difference]: Without dead ends: 865 [2021-11-02 22:28:23,923 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=137, Invalid=855, Unknown=0, NotChecked=0, Total=992 [2021-11-02 22:28:23,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 865 states. [2021-11-02 22:28:23,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 865 to 736. [2021-11-02 22:28:23,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 736 states, 723 states have (on average 1.1466113416320884) internal successors, (829), 727 states have internal predecessors, (829), 7 states have call successors, (7), 7 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:28:23,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 736 states to 736 states and 837 transitions. [2021-11-02 22:28:23,941 INFO L78 Accepts]: Start accepts. Automaton has 736 states and 837 transitions. Word has length 81 [2021-11-02 22:28:23,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:28:23,941 INFO L470 AbstractCegarLoop]: Abstraction has 736 states and 837 transitions. [2021-11-02 22:28:23,942 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 5.043478260869565) internal successors, (116), 21 states have internal predecessors, (116), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:28:23,942 INFO L276 IsEmpty]: Start isEmpty. Operand 736 states and 837 transitions. [2021-11-02 22:28:23,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-02 22:28:23,943 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:28:23,944 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:28:23,992 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-02 22:28:24,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-11-02 22:28:24,172 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:28:24,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:28:24,173 INFO L85 PathProgramCache]: Analyzing trace with hash 1208391589, now seen corresponding path program 7 times [2021-11-02 22:28:24,173 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:28:24,173 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470257794] [2021-11-02 22:28:24,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:28:24,173 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:28:24,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:28:24,442 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:28:24,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:28:24,447 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 49 proven. 41 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-02 22:28:24,447 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:28:24,447 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1470257794] [2021-11-02 22:28:24,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1470257794] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:28:24,447 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1910367104] [2021-11-02 22:28:24,448 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:28:24,448 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:28:24,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:28:24,449 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:28:24,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-02 22:28:25,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:28:25,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-02 22:28:25,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:28:25,598 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:28:25,599 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-02 22:28:25,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-02 22:28:26,193 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 75 proven. 15 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-02 22:28:26,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1910367104] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:28:26,193 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:28:26,193 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 29 [2021-11-02 22:28:26,193 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197122507] [2021-11-02 22:28:26,194 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-02 22:28:26,194 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:28:26,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-02 22:28:26,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=697, Unknown=0, NotChecked=0, Total=812 [2021-11-02 22:28:26,195 INFO L87 Difference]: Start difference. First operand 736 states and 837 transitions. Second operand has 29 states, 29 states have (on average 4.310344827586207) internal successors, (125), 26 states have internal predecessors, (125), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:28:27,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:28:27,227 INFO L93 Difference]: Finished difference Result 734 states and 816 transitions. [2021-11-02 22:28:27,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-02 22:28:27,227 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 4.310344827586207) internal successors, (125), 26 states have internal predecessors, (125), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 82 [2021-11-02 22:28:27,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:28:27,230 INFO L225 Difference]: With dead ends: 734 [2021-11-02 22:28:27,230 INFO L226 Difference]: Without dead ends: 579 [2021-11-02 22:28:27,230 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 318 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=338, Invalid=1554, Unknown=0, NotChecked=0, Total=1892 [2021-11-02 22:28:27,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 579 states. [2021-11-02 22:28:27,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 579 to 576. [2021-11-02 22:28:27,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 576 states, 564 states have (on average 1.1418439716312057) internal successors, (644), 568 states have internal predecessors, (644), 6 states have call successors, (6), 6 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:28:27,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 576 states to 576 states and 651 transitions. [2021-11-02 22:28:27,244 INFO L78 Accepts]: Start accepts. Automaton has 576 states and 651 transitions. Word has length 82 [2021-11-02 22:28:27,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:28:27,244 INFO L470 AbstractCegarLoop]: Abstraction has 576 states and 651 transitions. [2021-11-02 22:28:27,244 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 4.310344827586207) internal successors, (125), 26 states have internal predecessors, (125), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:28:27,244 INFO L276 IsEmpty]: Start isEmpty. Operand 576 states and 651 transitions. [2021-11-02 22:28:27,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-02 22:28:27,252 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:28:27,252 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:28:27,296 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-02 22:28:27,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:28:27,480 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:28:27,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:28:27,481 INFO L85 PathProgramCache]: Analyzing trace with hash 2040468610, now seen corresponding path program 8 times [2021-11-02 22:28:27,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:28:27,481 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [594682349] [2021-11-02 22:28:27,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:28:27,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:28:27,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:28:28,543 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:28:28,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:28:28,558 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 21 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:28:28,558 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:28:28,558 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [594682349] [2021-11-02 22:28:28,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [594682349] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:28:28,559 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [592645482] [2021-11-02 22:28:28,559 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:28:28,559 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:28:28,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:28:28,572 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:28:28,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-02 22:28:29,606 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:28:29,606 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:28:29,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-02 22:28:29,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:28:29,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-02 22:28:30,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-02 22:28:30,417 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 21 proven. 82 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-02 22:28:30,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [592645482] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:28:30,418 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:28:30,418 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 19] total 39 [2021-11-02 22:28:30,418 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440849801] [2021-11-02 22:28:30,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-02 22:28:30,418 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:28:30,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-02 22:28:30,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1387, Unknown=0, NotChecked=0, Total=1482 [2021-11-02 22:28:30,420 INFO L87 Difference]: Start difference. First operand 576 states and 651 transitions. Second operand has 39 states, 37 states have (on average 3.2162162162162162) internal successors, (119), 36 states have internal predecessors, (119), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:28:34,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:28:34,628 INFO L93 Difference]: Finished difference Result 1111 states and 1225 transitions. [2021-11-02 22:28:34,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-02 22:28:34,629 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 37 states have (on average 3.2162162162162162) internal successors, (119), 36 states have internal predecessors, (119), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2021-11-02 22:28:34,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:28:34,635 INFO L225 Difference]: With dead ends: 1111 [2021-11-02 22:28:34,635 INFO L226 Difference]: Without dead ends: 1081 [2021-11-02 22:28:34,637 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 777 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=414, Invalid=4698, Unknown=0, NotChecked=0, Total=5112 [2021-11-02 22:28:34,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1081 states. [2021-11-02 22:28:34,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1081 to 745. [2021-11-02 22:28:34,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 745 states, 732 states have (on average 1.1352459016393444) internal successors, (831), 736 states have internal predecessors, (831), 7 states have call successors, (7), 7 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:28:34,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 745 states to 745 states and 839 transitions. [2021-11-02 22:28:34,658 INFO L78 Accepts]: Start accepts. Automaton has 745 states and 839 transitions. Word has length 86 [2021-11-02 22:28:34,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:28:34,658 INFO L470 AbstractCegarLoop]: Abstraction has 745 states and 839 transitions. [2021-11-02 22:28:34,659 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 37 states have (on average 3.2162162162162162) internal successors, (119), 36 states have internal predecessors, (119), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:28:34,659 INFO L276 IsEmpty]: Start isEmpty. Operand 745 states and 839 transitions. [2021-11-02 22:28:34,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-02 22:28:34,660 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:28:34,660 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:28:34,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-02 22:28:34,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:28:34,884 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:28:34,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:28:34,885 INFO L85 PathProgramCache]: Analyzing trace with hash -1166482891, now seen corresponding path program 3 times [2021-11-02 22:28:34,885 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:28:34,885 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607123921] [2021-11-02 22:28:34,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:28:34,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:28:34,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:28:35,144 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:28:35,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:28:35,148 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 6 proven. 102 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:28:35,148 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:28:35,148 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607123921] [2021-11-02 22:28:35,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [607123921] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:28:35,148 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [430189654] [2021-11-02 22:28:35,149 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:28:35,149 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:28:35,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:28:35,150 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:28:35,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-02 22:28:36,237 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-02 22:28:36,237 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:28:36,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-02 22:28:36,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:28:36,275 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:28:36,275 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:28:36,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:28:36,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-02 22:28:36,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 27 [2021-11-02 22:28:38,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:28:38,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:28:38,074 INFO L354 Elim1Store]: treesize reduction 42, result has 31.1 percent of original size [2021-11-02 22:28:38,074 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 49 treesize of output 39 [2021-11-02 22:28:38,386 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 19 proven. 59 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-02 22:28:38,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [430189654] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:28:38,387 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:28:38,387 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 33 [2021-11-02 22:28:38,387 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509004372] [2021-11-02 22:28:38,388 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-02 22:28:38,388 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:28:38,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-02 22:28:38,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1037, Unknown=0, NotChecked=0, Total=1122 [2021-11-02 22:28:38,389 INFO L87 Difference]: Start difference. First operand 745 states and 839 transitions. Second operand has 34 states, 32 states have (on average 4.40625) internal successors, (141), 31 states have internal predecessors, (141), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:28:48,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:28:48,682 INFO L93 Difference]: Finished difference Result 1664 states and 1832 transitions. [2021-11-02 22:28:48,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-11-02 22:28:48,682 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 32 states have (on average 4.40625) internal successors, (141), 31 states have internal predecessors, (141), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 87 [2021-11-02 22:28:48,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:28:48,688 INFO L225 Difference]: With dead ends: 1664 [2021-11-02 22:28:48,688 INFO L226 Difference]: Without dead ends: 1664 [2021-11-02 22:28:48,689 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3650 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=1882, Invalid=10550, Unknown=0, NotChecked=0, Total=12432 [2021-11-02 22:28:48,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1664 states. [2021-11-02 22:28:48,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1664 to 1309. [2021-11-02 22:28:48,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1309 states, 1296 states have (on average 1.1350308641975309) internal successors, (1471), 1300 states have internal predecessors, (1471), 7 states have call successors, (7), 7 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:28:48,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1309 states to 1309 states and 1479 transitions. [2021-11-02 22:28:48,720 INFO L78 Accepts]: Start accepts. Automaton has 1309 states and 1479 transitions. Word has length 87 [2021-11-02 22:28:48,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:28:48,721 INFO L470 AbstractCegarLoop]: Abstraction has 1309 states and 1479 transitions. [2021-11-02 22:28:48,721 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 32 states have (on average 4.40625) internal successors, (141), 31 states have internal predecessors, (141), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:28:48,721 INFO L276 IsEmpty]: Start isEmpty. Operand 1309 states and 1479 transitions. [2021-11-02 22:28:48,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-02 22:28:48,723 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:28:48,723 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:28:48,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-02 22:28:48,944 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-02 22:28:48,944 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:28:48,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:28:48,945 INFO L85 PathProgramCache]: Analyzing trace with hash 2096045983, now seen corresponding path program 9 times [2021-11-02 22:28:48,945 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:28:48,945 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554594653] [2021-11-02 22:28:48,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:28:48,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:28:48,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:28:49,264 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:28:49,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:28:49,267 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 15 proven. 105 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-02 22:28:49,267 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:28:49,267 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554594653] [2021-11-02 22:28:49,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [554594653] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:28:49,267 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1304964307] [2021-11-02 22:28:49,267 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:28:49,268 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:28:49,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:28:49,269 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:28:49,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-02 22:28:50,469 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-02 22:28:50,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:28:50,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-02 22:28:50,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:28:50,508 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:28:50,509 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:28:51,325 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 28 proven. 92 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-02 22:28:51,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1304964307] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:28:51,326 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:28:51,326 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 34 [2021-11-02 22:28:51,326 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423696480] [2021-11-02 22:28:51,326 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-02 22:28:51,326 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:28:51,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-02 22:28:51,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=1052, Unknown=0, NotChecked=0, Total=1190 [2021-11-02 22:28:51,327 INFO L87 Difference]: Start difference. First operand 1309 states and 1479 transitions. Second operand has 35 states, 33 states have (on average 4.363636363636363) internal successors, (144), 32 states have internal predecessors, (144), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:28:52,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:28:52,697 INFO L93 Difference]: Finished difference Result 1558 states and 1748 transitions. [2021-11-02 22:28:52,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-02 22:28:52,698 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 33 states have (on average 4.363636363636363) internal successors, (144), 32 states have internal predecessors, (144), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 90 [2021-11-02 22:28:52,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:28:52,705 INFO L225 Difference]: With dead ends: 1558 [2021-11-02 22:28:52,705 INFO L226 Difference]: Without dead ends: 1556 [2021-11-02 22:28:52,706 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=252, Invalid=1640, Unknown=0, NotChecked=0, Total=1892 [2021-11-02 22:28:52,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1556 states. [2021-11-02 22:28:52,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1556 to 1372. [2021-11-02 22:28:52,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1372 states, 1359 states have (on average 1.1353936718175128) internal successors, (1543), 1363 states have internal predecessors, (1543), 7 states have call successors, (7), 7 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:28:52,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1372 states to 1372 states and 1551 transitions. [2021-11-02 22:28:52,739 INFO L78 Accepts]: Start accepts. Automaton has 1372 states and 1551 transitions. Word has length 90 [2021-11-02 22:28:52,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:28:52,740 INFO L470 AbstractCegarLoop]: Abstraction has 1372 states and 1551 transitions. [2021-11-02 22:28:52,740 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 33 states have (on average 4.363636363636363) internal successors, (144), 32 states have internal predecessors, (144), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:28:52,740 INFO L276 IsEmpty]: Start isEmpty. Operand 1372 states and 1551 transitions. [2021-11-02 22:28:52,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-02 22:28:52,742 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:28:52,742 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:28:52,777 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-02 22:28:52,956 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-02 22:28:52,956 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:28:52,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:28:52,957 INFO L85 PathProgramCache]: Analyzing trace with hash 102270395, now seen corresponding path program 8 times [2021-11-02 22:28:52,957 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:28:52,957 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172213164] [2021-11-02 22:28:52,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:28:52,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:28:52,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:28:53,348 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:28:53,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:28:53,352 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 41 proven. 102 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:28:53,352 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:28:53,352 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172213164] [2021-11-02 22:28:53,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [172213164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:28:53,353 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [764727975] [2021-11-02 22:28:53,353 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:28:53,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:28:53,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:28:53,356 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:28:53,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-02 22:28:54,857 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:28:54,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:28:54,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-02 22:28:54,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:28:54,882 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:28:55,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-02 22:28:55,197 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-02 22:28:55,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 38 [2021-11-02 22:28:57,969 INFO L354 Elim1Store]: treesize reduction 33, result has 26.7 percent of original size [2021-11-02 22:28:57,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 41 [2021-11-02 22:28:58,285 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 15 proven. 128 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:28:58,286 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [764727975] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:28:58,286 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:28:58,286 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 35 [2021-11-02 22:28:58,286 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808845300] [2021-11-02 22:28:58,287 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-02 22:28:58,287 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:28:58,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-02 22:28:58,288 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1101, Unknown=0, NotChecked=0, Total=1190 [2021-11-02 22:28:58,288 INFO L87 Difference]: Start difference. First operand 1372 states and 1551 transitions. Second operand has 35 states, 34 states have (on average 5.0588235294117645) internal successors, (172), 32 states have internal predecessors, (172), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:29:10,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:29:10,949 INFO L93 Difference]: Finished difference Result 3047 states and 3394 transitions. [2021-11-02 22:29:10,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-02 22:29:10,950 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 5.0588235294117645) internal successors, (172), 32 states have internal predecessors, (172), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 92 [2021-11-02 22:29:10,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:29:10,963 INFO L225 Difference]: With dead ends: 3047 [2021-11-02 22:29:10,963 INFO L226 Difference]: Without dead ends: 2434 [2021-11-02 22:29:10,964 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 513 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=319, Invalid=3220, Unknown=1, NotChecked=0, Total=3540 [2021-11-02 22:29:10,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2434 states. [2021-11-02 22:29:11,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2434 to 1896. [2021-11-02 22:29:11,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1896 states, 1882 states have (on average 1.138682252922423) internal successors, (2143), 1886 states have internal predecessors, (2143), 8 states have call successors, (8), 8 states have call predecessors, (8), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:29:11,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1896 states to 1896 states and 2152 transitions. [2021-11-02 22:29:11,020 INFO L78 Accepts]: Start accepts. Automaton has 1896 states and 2152 transitions. Word has length 92 [2021-11-02 22:29:11,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:29:11,020 INFO L470 AbstractCegarLoop]: Abstraction has 1896 states and 2152 transitions. [2021-11-02 22:29:11,021 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 5.0588235294117645) internal successors, (172), 32 states have internal predecessors, (172), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:29:11,021 INFO L276 IsEmpty]: Start isEmpty. Operand 1896 states and 2152 transitions. [2021-11-02 22:29:11,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-02 22:29:11,023 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:29:11,024 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:29:11,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-02 22:29:11,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-02 22:29:11,244 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:29:11,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:29:11,245 INFO L85 PathProgramCache]: Analyzing trace with hash -401824019, now seen corresponding path program 10 times [2021-11-02 22:29:11,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:29:11,245 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479621833] [2021-11-02 22:29:11,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:29:11,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:29:11,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:29:11,648 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:29:11,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:29:11,652 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 61 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-02 22:29:11,652 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:29:11,652 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479621833] [2021-11-02 22:29:11,652 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1479621833] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:29:11,653 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [150056602] [2021-11-02 22:29:11,653 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:29:11,653 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:29:11,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:29:11,654 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:29:11,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-02 22:29:13,348 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:29:13,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:29:13,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-02 22:29:13,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:29:13,382 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:29:13,382 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-02 22:29:13,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-02 22:29:14,126 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 111 proven. 28 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-02 22:29:14,126 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [150056602] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:29:14,126 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:29:14,126 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 33 [2021-11-02 22:29:14,127 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573768487] [2021-11-02 22:29:14,127 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-02 22:29:14,127 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:29:14,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-02 22:29:14,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=905, Unknown=0, NotChecked=0, Total=1056 [2021-11-02 22:29:14,128 INFO L87 Difference]: Start difference. First operand 1896 states and 2152 transitions. Second operand has 33 states, 33 states have (on average 4.454545454545454) internal successors, (147), 30 states have internal predecessors, (147), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:29:15,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:29:15,393 INFO L93 Difference]: Finished difference Result 1908 states and 2138 transitions. [2021-11-02 22:29:15,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-02 22:29:15,393 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 4.454545454545454) internal successors, (147), 30 states have internal predecessors, (147), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2021-11-02 22:29:15,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:29:15,400 INFO L225 Difference]: With dead ends: 1908 [2021-11-02 22:29:15,400 INFO L226 Difference]: Without dead ends: 1660 [2021-11-02 22:29:15,400 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 434 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=431, Invalid=2019, Unknown=0, NotChecked=0, Total=2450 [2021-11-02 22:29:15,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1660 states. [2021-11-02 22:29:15,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1660 to 1657. [2021-11-02 22:29:15,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1657 states, 1644 states have (on average 1.135036496350365) internal successors, (1866), 1648 states have internal predecessors, (1866), 7 states have call successors, (7), 7 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:29:15,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1657 states to 1657 states and 1874 transitions. [2021-11-02 22:29:15,441 INFO L78 Accepts]: Start accepts. Automaton has 1657 states and 1874 transitions. Word has length 97 [2021-11-02 22:29:15,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:29:15,442 INFO L470 AbstractCegarLoop]: Abstraction has 1657 states and 1874 transitions. [2021-11-02 22:29:15,442 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 4.454545454545454) internal successors, (147), 30 states have internal predecessors, (147), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:29:15,442 INFO L276 IsEmpty]: Start isEmpty. Operand 1657 states and 1874 transitions. [2021-11-02 22:29:15,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-02 22:29:15,445 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:29:15,445 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:29:15,495 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-02 22:29:15,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-02 22:29:15,660 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:29:15,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:29:15,661 INFO L85 PathProgramCache]: Analyzing trace with hash -1244056464, now seen corresponding path program 11 times [2021-11-02 22:29:15,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:29:15,661 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294463524] [2021-11-02 22:29:15,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:29:15,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:29:15,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:29:17,077 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:29:17,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:29:17,094 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 26 proven. 175 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:29:17,094 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:29:17,094 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294463524] [2021-11-02 22:29:17,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1294463524] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:29:17,094 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1469046337] [2021-11-02 22:29:17,094 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:29:17,094 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:29:17,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:29:17,095 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:29:17,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-02 22:29:18,555 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-11-02 22:29:18,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:29:18,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-02 22:29:18,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:29:18,610 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:29:18,610 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:29:19,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-02 22:29:20,193 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:29:20,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-11-02 22:29:20,513 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 1 proven. 185 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:29:20,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1469046337] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:29:20,513 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:29:20,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 23] total 53 [2021-11-02 22:29:20,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521432537] [2021-11-02 22:29:20,514 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-02 22:29:20,514 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:29:20,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-02 22:29:20,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=2630, Unknown=0, NotChecked=0, Total=2756 [2021-11-02 22:29:20,515 INFO L87 Difference]: Start difference. First operand 1657 states and 1874 transitions. Second operand has 53 states, 51 states have (on average 3.5686274509803924) internal successors, (182), 50 states have internal predecessors, (182), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:29:28,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:29:28,156 INFO L93 Difference]: Finished difference Result 2696 states and 2997 transitions. [2021-11-02 22:29:28,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-11-02 22:29:28,157 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 51 states have (on average 3.5686274509803924) internal successors, (182), 50 states have internal predecessors, (182), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-11-02 22:29:28,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:29:28,166 INFO L225 Difference]: With dead ends: 2696 [2021-11-02 22:29:28,167 INFO L226 Difference]: Without dead ends: 2661 [2021-11-02 22:29:28,167 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1683 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=639, Invalid=9461, Unknown=0, NotChecked=0, Total=10100 [2021-11-02 22:29:28,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2661 states. [2021-11-02 22:29:28,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2661 to 2216. [2021-11-02 22:29:28,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2216 states, 2202 states have (on average 1.1316984559491372) internal successors, (2492), 2206 states have internal predecessors, (2492), 8 states have call successors, (8), 8 states have call predecessors, (8), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:29:28,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2216 states to 2216 states and 2501 transitions. [2021-11-02 22:29:28,215 INFO L78 Accepts]: Start accepts. Automaton has 2216 states and 2501 transitions. Word has length 101 [2021-11-02 22:29:28,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:29:28,216 INFO L470 AbstractCegarLoop]: Abstraction has 2216 states and 2501 transitions. [2021-11-02 22:29:28,216 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 51 states have (on average 3.5686274509803924) internal successors, (182), 50 states have internal predecessors, (182), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:29:28,216 INFO L276 IsEmpty]: Start isEmpty. Operand 2216 states and 2501 transitions. [2021-11-02 22:29:28,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-02 22:29:28,219 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:29:28,219 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:29:28,264 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-02 22:29:28,434 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:29:28,434 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:29:28,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:29:28,434 INFO L85 PathProgramCache]: Analyzing trace with hash -1454733793, now seen corresponding path program 9 times [2021-11-02 22:29:28,434 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:29:28,435 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451502434] [2021-11-02 22:29:28,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:29:28,435 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:29:28,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:29:28,868 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:29:28,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:29:28,871 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 51 proven. 165 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:29:28,871 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:29:28,872 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451502434] [2021-11-02 22:29:28,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [451502434] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:29:28,872 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1302976647] [2021-11-02 22:29:28,872 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:29:28,872 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:29:28,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:29:28,873 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:29:28,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-02 22:29:30,441 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-02 22:29:30,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:29:30,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-02 22:29:30,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:29:30,479 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:29:30,479 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:29:30,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:29:31,115 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-02 22:29:31,186 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-02 22:29:31,186 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2021-11-02 22:29:33,109 INFO L354 Elim1Store]: treesize reduction 39, result has 26.4 percent of original size [2021-11-02 22:29:33,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 44 treesize of output 36 [2021-11-02 22:29:33,271 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 141 proven. 75 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:29:33,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1302976647] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:29:33,271 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:29:33,271 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 38 [2021-11-02 22:29:33,271 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955570360] [2021-11-02 22:29:33,272 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-02 22:29:33,272 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:29:33,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-02 22:29:33,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1302, Unknown=0, NotChecked=0, Total=1406 [2021-11-02 22:29:33,273 INFO L87 Difference]: Start difference. First operand 2216 states and 2501 transitions. Second operand has 38 states, 37 states have (on average 5.324324324324325) internal successors, (197), 35 states have internal predecessors, (197), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:29:56,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:29:56,595 INFO L93 Difference]: Finished difference Result 3499 states and 3905 transitions. [2021-11-02 22:29:56,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-02 22:29:56,596 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 5.324324324324325) internal successors, (197), 35 states have internal predecessors, (197), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2021-11-02 22:29:56,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:29:56,605 INFO L225 Difference]: With dead ends: 3499 [2021-11-02 22:29:56,606 INFO L226 Difference]: Without dead ends: 2872 [2021-11-02 22:29:56,606 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=255, Invalid=2825, Unknown=0, NotChecked=0, Total=3080 [2021-11-02 22:29:56,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2872 states. [2021-11-02 22:29:56,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2872 to 2707. [2021-11-02 22:29:56,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2707 states, 2689 states have (on average 1.1297880252882113) internal successors, (3038), 2693 states have internal predecessors, (3038), 12 states have call successors, (12), 12 states have call predecessors, (12), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:29:56,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2707 states to 2707 states and 3051 transitions. [2021-11-02 22:29:56,640 INFO L78 Accepts]: Start accepts. Automaton has 2707 states and 3051 transitions. Word has length 107 [2021-11-02 22:29:56,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:29:56,640 INFO L470 AbstractCegarLoop]: Abstraction has 2707 states and 3051 transitions. [2021-11-02 22:29:56,641 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 5.324324324324325) internal successors, (197), 35 states have internal predecessors, (197), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:29:56,641 INFO L276 IsEmpty]: Start isEmpty. Operand 2707 states and 3051 transitions. [2021-11-02 22:29:56,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-02 22:29:56,644 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:29:56,645 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:29:56,671 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2021-11-02 22:29:56,846 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:29:56,846 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:29:56,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:29:56,847 INFO L85 PathProgramCache]: Analyzing trace with hash -812495902, now seen corresponding path program 10 times [2021-11-02 22:29:56,847 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:29:56,847 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1732612899] [2021-11-02 22:29:56,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:29:56,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:29:56,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:29:57,198 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:29:57,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:29:57,206 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 28 proven. 209 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:29:57,206 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:29:57,206 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1732612899] [2021-11-02 22:29:57,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1732612899] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:29:57,206 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596938297] [2021-11-02 22:29:57,207 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:29:57,207 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:29:57,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:29:57,209 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:29:57,210 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-02 22:29:58,843 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:29:58,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:29:58,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-02 22:29:58,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:29:58,876 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:29:58,876 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:29:59,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-02 22:29:59,486 INFO L354 Elim1Store]: treesize reduction 41, result has 18.0 percent of original size [2021-11-02 22:29:59,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 39 [2021-11-02 22:30:04,582 INFO L354 Elim1Store]: treesize reduction 18, result has 61.7 percent of original size [2021-11-02 22:30:04,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 43 treesize of output 52 [2021-11-02 22:30:05,009 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 115 proven. 57 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-02 22:30:05,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596938297] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:05,010 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:30:05,010 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19] total 36 [2021-11-02 22:30:05,010 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068829583] [2021-11-02 22:30:05,011 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-02 22:30:05,011 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:05,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-02 22:30:05,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1222, Unknown=0, NotChecked=0, Total=1332 [2021-11-02 22:30:05,012 INFO L87 Difference]: Start difference. First operand 2707 states and 3051 transitions. Second operand has 37 states, 35 states have (on average 5.428571428571429) internal successors, (190), 34 states have internal predecessors, (190), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:30:09,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:09,105 INFO L93 Difference]: Finished difference Result 3421 states and 3832 transitions. [2021-11-02 22:30:09,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-02 22:30:09,106 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 35 states have (on average 5.428571428571429) internal successors, (190), 34 states have internal predecessors, (190), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 111 [2021-11-02 22:30:09,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:09,121 INFO L225 Difference]: With dead ends: 3421 [2021-11-02 22:30:09,122 INFO L226 Difference]: Without dead ends: 3340 [2021-11-02 22:30:09,123 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1058 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=535, Invalid=4435, Unknown=0, NotChecked=0, Total=4970 [2021-11-02 22:30:09,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3340 states. [2021-11-02 22:30:09,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3340 to 2972. [2021-11-02 22:30:09,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2972 states, 2955 states have (on average 1.1336717428087986) internal successors, (3350), 2959 states have internal predecessors, (3350), 11 states have call successors, (11), 11 states have call predecessors, (11), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:30:09,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2972 states to 2972 states and 3362 transitions. [2021-11-02 22:30:09,167 INFO L78 Accepts]: Start accepts. Automaton has 2972 states and 3362 transitions. Word has length 111 [2021-11-02 22:30:09,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:09,168 INFO L470 AbstractCegarLoop]: Abstraction has 2972 states and 3362 transitions. [2021-11-02 22:30:09,168 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 35 states have (on average 5.428571428571429) internal successors, (190), 34 states have internal predecessors, (190), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:30:09,168 INFO L276 IsEmpty]: Start isEmpty. Operand 2972 states and 3362 transitions. [2021-11-02 22:30:09,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-02 22:30:09,172 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:09,172 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:30:09,213 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-02 22:30:09,388 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-11-02 22:30:09,388 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:30:09,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:09,388 INFO L85 PathProgramCache]: Analyzing trace with hash -1474937767, now seen corresponding path program 12 times [2021-11-02 22:30:09,388 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:09,389 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1374388671] [2021-11-02 22:30:09,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:09,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:09,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:09,852 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:09,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:09,857 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 114 proven. 85 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-02 22:30:09,857 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:09,857 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1374388671] [2021-11-02 22:30:09,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1374388671] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:09,857 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1682126045] [2021-11-02 22:30:09,857 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:30:09,858 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:30:09,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:30:09,860 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:30:09,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-02 22:30:12,046 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-11-02 22:30:12,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:30:12,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 445 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-02 22:30:12,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:30:12,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-02 22:30:13,400 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-02 22:30:13,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 16 [2021-11-02 22:30:13,481 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 31 proven. 189 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-02 22:30:13,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1682126045] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:13,481 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:30:13,481 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 23] total 41 [2021-11-02 22:30:13,481 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040626313] [2021-11-02 22:30:13,482 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-02 22:30:13,482 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:13,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-02 22:30:13,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1528, Unknown=0, NotChecked=0, Total=1640 [2021-11-02 22:30:13,482 INFO L87 Difference]: Start difference. First operand 2972 states and 3362 transitions. Second operand has 41 states, 40 states have (on average 4.325) internal successors, (173), 38 states have internal predecessors, (173), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:30:21,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:21,108 INFO L93 Difference]: Finished difference Result 4477 states and 4970 transitions. [2021-11-02 22:30:21,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-11-02 22:30:21,117 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 4.325) internal successors, (173), 38 states have internal predecessors, (173), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 112 [2021-11-02 22:30:21,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:21,138 INFO L225 Difference]: With dead ends: 4477 [2021-11-02 22:30:21,139 INFO L226 Difference]: Without dead ends: 4165 [2021-11-02 22:30:21,140 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2645 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=994, Invalid=10562, Unknown=0, NotChecked=0, Total=11556 [2021-11-02 22:30:21,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4165 states. [2021-11-02 22:30:21,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4165 to 3768. [2021-11-02 22:30:21,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3768 states, 3749 states have (on average 1.1277674046412376) internal successors, (4228), 3753 states have internal predecessors, (4228), 13 states have call successors, (13), 13 states have call predecessors, (13), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:30:21,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3768 states to 3768 states and 4242 transitions. [2021-11-02 22:30:21,187 INFO L78 Accepts]: Start accepts. Automaton has 3768 states and 4242 transitions. Word has length 112 [2021-11-02 22:30:21,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:21,188 INFO L470 AbstractCegarLoop]: Abstraction has 3768 states and 4242 transitions. [2021-11-02 22:30:21,188 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 4.325) internal successors, (173), 38 states have internal predecessors, (173), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:30:21,188 INFO L276 IsEmpty]: Start isEmpty. Operand 3768 states and 4242 transitions. [2021-11-02 22:30:21,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-02 22:30:21,192 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:21,193 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:30:21,235 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-02 22:30:21,420 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:30:21,420 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:30:21,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:21,421 INFO L85 PathProgramCache]: Analyzing trace with hash -1125472359, now seen corresponding path program 13 times [2021-11-02 22:30:21,421 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:21,421 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075648219] [2021-11-02 22:30:21,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:21,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:21,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:21,758 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:21,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:21,762 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 118 proven. 81 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-02 22:30:21,763 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:21,763 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075648219] [2021-11-02 22:30:21,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2075648219] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:21,763 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1052761407] [2021-11-02 22:30:21,763 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:30:21,763 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:30:21,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:30:21,768 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:30:21,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-02 22:30:24,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:24,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 445 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-02 22:30:24,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:30:24,069 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:30:24,070 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:30:24,994 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 154 proven. 45 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-02 22:30:24,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1052761407] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:24,994 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:30:24,994 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 39 [2021-11-02 22:30:24,994 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818411727] [2021-11-02 22:30:24,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-02 22:30:24,995 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:24,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-02 22:30:24,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=1264, Unknown=0, NotChecked=0, Total=1482 [2021-11-02 22:30:24,996 INFO L87 Difference]: Start difference. First operand 3768 states and 4242 transitions. Second operand has 39 states, 38 states have (on average 4.342105263157895) internal successors, (165), 36 states have internal predecessors, (165), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:30:25,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:25,842 INFO L93 Difference]: Finished difference Result 5041 states and 5607 transitions. [2021-11-02 22:30:25,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-02 22:30:25,843 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 4.342105263157895) internal successors, (165), 36 states have internal predecessors, (165), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 112 [2021-11-02 22:30:25,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:25,853 INFO L225 Difference]: With dead ends: 5041 [2021-11-02 22:30:25,853 INFO L226 Difference]: Without dead ends: 5028 [2021-11-02 22:30:25,854 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 897 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=420, Invalid=2232, Unknown=0, NotChecked=0, Total=2652 [2021-11-02 22:30:25,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5028 states. [2021-11-02 22:30:25,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5028 to 3768. [2021-11-02 22:30:25,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3768 states, 3749 states have (on average 1.1277674046412376) internal successors, (4228), 3753 states have internal predecessors, (4228), 13 states have call successors, (13), 13 states have call predecessors, (13), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:30:25,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3768 states to 3768 states and 4242 transitions. [2021-11-02 22:30:25,912 INFO L78 Accepts]: Start accepts. Automaton has 3768 states and 4242 transitions. Word has length 112 [2021-11-02 22:30:25,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:25,913 INFO L470 AbstractCegarLoop]: Abstraction has 3768 states and 4242 transitions. [2021-11-02 22:30:25,913 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 4.342105263157895) internal successors, (165), 36 states have internal predecessors, (165), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:30:25,913 INFO L276 IsEmpty]: Start isEmpty. Operand 3768 states and 4242 transitions. [2021-11-02 22:30:25,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-02 22:30:25,918 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:25,918 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:30:25,960 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-02 22:30:26,144 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:30:26,144 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:30:26,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:26,145 INFO L85 PathProgramCache]: Analyzing trace with hash -317926701, now seen corresponding path program 14 times [2021-11-02 22:30:26,145 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:26,145 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [600213416] [2021-11-02 22:30:26,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:26,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:26,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:26,637 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:26,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:26,640 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 45 proven. 200 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-02 22:30:26,640 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:26,640 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [600213416] [2021-11-02 22:30:26,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [600213416] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:26,640 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [850159133] [2021-11-02 22:30:26,640 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:30:26,641 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:30:26,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:30:26,649 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:30:26,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-02 22:30:28,522 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:30:28,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:30:28,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 467 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-02 22:30:28,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:30:28,573 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:30:28,573 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:30:29,719 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 66 proven. 179 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-02 22:30:29,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [850159133] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:29,719 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:30:29,720 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 41 [2021-11-02 22:30:29,720 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969260594] [2021-11-02 22:30:29,720 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-02 22:30:29,720 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:29,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-02 22:30:29,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1540, Unknown=0, NotChecked=0, Total=1722 [2021-11-02 22:30:29,721 INFO L87 Difference]: Start difference. First operand 3768 states and 4242 transitions. Second operand has 42 states, 40 states have (on average 4.575) internal successors, (183), 39 states have internal predecessors, (183), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:30:31,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:31,485 INFO L93 Difference]: Finished difference Result 4473 states and 4991 transitions. [2021-11-02 22:30:31,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-02 22:30:31,486 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 40 states have (on average 4.575) internal successors, (183), 39 states have internal predecessors, (183), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 120 [2021-11-02 22:30:31,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:31,495 INFO L225 Difference]: With dead ends: 4473 [2021-11-02 22:30:31,495 INFO L226 Difference]: Without dead ends: 4471 [2021-11-02 22:30:31,496 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 101 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 836 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=303, Invalid=2453, Unknown=0, NotChecked=0, Total=2756 [2021-11-02 22:30:31,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4471 states. [2021-11-02 22:30:31,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4471 to 3908. [2021-11-02 22:30:31,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3908 states, 3889 states have (on average 1.128053484186166) internal successors, (4387), 3893 states have internal predecessors, (4387), 13 states have call successors, (13), 13 states have call predecessors, (13), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:30:31,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3908 states to 3908 states and 4401 transitions. [2021-11-02 22:30:31,566 INFO L78 Accepts]: Start accepts. Automaton has 3908 states and 4401 transitions. Word has length 120 [2021-11-02 22:30:31,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:31,567 INFO L470 AbstractCegarLoop]: Abstraction has 3908 states and 4401 transitions. [2021-11-02 22:30:31,567 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 40 states have (on average 4.575) internal successors, (183), 39 states have internal predecessors, (183), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:30:31,567 INFO L276 IsEmpty]: Start isEmpty. Operand 3908 states and 4401 transitions. [2021-11-02 22:30:31,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-02 22:30:31,573 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:31,573 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:30:31,620 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-02 22:30:31,796 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-11-02 22:30:31,796 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:30:31,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:31,797 INFO L85 PathProgramCache]: Analyzing trace with hash -1612426510, now seen corresponding path program 11 times [2021-11-02 22:30:31,797 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:31,797 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650298901] [2021-11-02 22:30:31,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:31,797 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:31,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:32,417 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:32,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:32,422 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 61 proven. 243 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:30:32,422 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:32,422 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650298901] [2021-11-02 22:30:32,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650298901] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:32,422 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1061609411] [2021-11-02 22:30:32,423 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:30:32,423 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:30:32,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:30:32,428 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:30:32,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-02 22:30:34,514 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-11-02 22:30:34,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:30:34,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 523 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-02 22:30:34,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:30:34,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:30:35,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-02 22:30:35,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:30:35,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 23 [2021-11-02 22:30:36,580 INFO L354 Elim1Store]: treesize reduction 14, result has 6.7 percent of original size [2021-11-02 22:30:36,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 14 [2021-11-02 22:30:36,601 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 61 proven. 243 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:30:36,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1061609411] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:36,601 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:30:36,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23] total 33 [2021-11-02 22:30:36,602 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224376405] [2021-11-02 22:30:36,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-02 22:30:36,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:36,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-02 22:30:36,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=978, Unknown=0, NotChecked=0, Total=1056 [2021-11-02 22:30:36,603 INFO L87 Difference]: Start difference. First operand 3908 states and 4401 transitions. Second operand has 33 states, 32 states have (on average 6.0) internal successors, (192), 30 states have internal predecessors, (192), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:30:46,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:46,035 INFO L93 Difference]: Finished difference Result 6206 states and 6955 transitions. [2021-11-02 22:30:46,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-02 22:30:46,035 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 6.0) internal successors, (192), 30 states have internal predecessors, (192), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 126 [2021-11-02 22:30:46,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:46,041 INFO L225 Difference]: With dead ends: 6206 [2021-11-02 22:30:46,041 INFO L226 Difference]: Without dead ends: 5484 [2021-11-02 22:30:46,042 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 114 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=168, Invalid=1812, Unknown=0, NotChecked=0, Total=1980 [2021-11-02 22:30:46,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5484 states. [2021-11-02 22:30:46,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5484 to 4856. [2021-11-02 22:30:46,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4856 states, 4832 states have (on average 1.1258278145695364) internal successors, (5440), 4836 states have internal predecessors, (5440), 18 states have call successors, (18), 18 states have call predecessors, (18), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:30:46,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4856 states to 4856 states and 5459 transitions. [2021-11-02 22:30:46,112 INFO L78 Accepts]: Start accepts. Automaton has 4856 states and 5459 transitions. Word has length 126 [2021-11-02 22:30:46,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:46,112 INFO L470 AbstractCegarLoop]: Abstraction has 4856 states and 5459 transitions. [2021-11-02 22:30:46,112 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 6.0) internal successors, (192), 30 states have internal predecessors, (192), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:30:46,113 INFO L276 IsEmpty]: Start isEmpty. Operand 4856 states and 5459 transitions. [2021-11-02 22:30:46,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-02 22:30:46,119 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:46,119 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:30:46,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-02 22:30:46,332 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-11-02 22:30:46,332 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:30:46,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:46,333 INFO L85 PathProgramCache]: Analyzing trace with hash 426553657, now seen corresponding path program 15 times [2021-11-02 22:30:46,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:46,333 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1747978241] [2021-11-02 22:30:46,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:46,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:46,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:46,757 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:46,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:46,761 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 157 proven. 113 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-02 22:30:46,761 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:46,762 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1747978241] [2021-11-02 22:30:46,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1747978241] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:46,762 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [402265695] [2021-11-02 22:30:46,762 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:30:46,762 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:30:46,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:30:46,763 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:30:46,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-02 22:30:49,249 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-02 22:30:49,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:30:49,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-02 22:30:49,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:30:49,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-02 22:30:50,875 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-02 22:30:50,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 16 [2021-11-02 22:30:50,992 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 36 proven. 259 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-02 22:30:50,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [402265695] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:50,992 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:30:50,992 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 25] total 45 [2021-11-02 22:30:50,993 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713318960] [2021-11-02 22:30:50,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-02 22:30:50,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:50,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-02 22:30:50,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1848, Unknown=0, NotChecked=0, Total=1980 [2021-11-02 22:30:50,994 INFO L87 Difference]: Start difference. First operand 4856 states and 5459 transitions. Second operand has 45 states, 44 states have (on average 4.431818181818182) internal successors, (195), 42 states have internal predecessors, (195), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:31:00,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:31:00,844 INFO L93 Difference]: Finished difference Result 7057 states and 7815 transitions. [2021-11-02 22:31:00,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2021-11-02 22:31:00,852 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 44 states have (on average 4.431818181818182) internal successors, (195), 42 states have internal predecessors, (195), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 127 [2021-11-02 22:31:00,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:31:00,864 INFO L225 Difference]: With dead ends: 7057 [2021-11-02 22:31:00,865 INFO L226 Difference]: Without dead ends: 6612 [2021-11-02 22:31:00,866 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4296 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=1288, Invalid=15742, Unknown=0, NotChecked=0, Total=17030 [2021-11-02 22:31:00,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6612 states. [2021-11-02 22:31:00,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6612 to 5987. [2021-11-02 22:31:00,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5987 states, 5960 states have (on average 1.1223154362416108) internal successors, (6689), 5964 states have internal predecessors, (6689), 21 states have call successors, (21), 21 states have call predecessors, (21), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:31:00,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5987 states to 5987 states and 6711 transitions. [2021-11-02 22:31:00,959 INFO L78 Accepts]: Start accepts. Automaton has 5987 states and 6711 transitions. Word has length 127 [2021-11-02 22:31:00,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:31:00,960 INFO L470 AbstractCegarLoop]: Abstraction has 5987 states and 6711 transitions. [2021-11-02 22:31:00,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 44 states have (on average 4.431818181818182) internal successors, (195), 42 states have internal predecessors, (195), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:31:00,960 INFO L276 IsEmpty]: Start isEmpty. Operand 5987 states and 6711 transitions. [2021-11-02 22:31:00,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-02 22:31:00,967 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:31:00,967 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:31:01,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-02 22:31:01,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-11-02 22:31:01,180 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:31:01,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:31:01,181 INFO L85 PathProgramCache]: Analyzing trace with hash 307297367, now seen corresponding path program 4 times [2021-11-02 22:31:01,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:31:01,181 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531395644] [2021-11-02 22:31:01,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:31:01,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:31:01,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:31:01,536 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:31:01,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:31:01,540 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 15 proven. 331 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-02 22:31:01,541 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:31:01,541 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531395644] [2021-11-02 22:31:01,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [531395644] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:31:01,541 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1559719518] [2021-11-02 22:31:01,541 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:31:01,541 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:31:01,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:31:01,542 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:31:01,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-02 22:31:03,873 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:31:03,874 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:31:03,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-02 22:31:03,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:31:03,915 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:31:03,915 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:31:04,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-02 22:31:04,796 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-02 22:31:04,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 33 [2021-11-02 22:31:07,136 INFO L354 Elim1Store]: treesize reduction 39, result has 23.5 percent of original size [2021-11-02 22:31:07,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 27 [2021-11-02 22:31:07,525 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 32 proven. 325 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-02 22:31:07,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1559719518] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:31:07,526 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:31:07,526 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 24] total 40 [2021-11-02 22:31:07,526 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675655082] [2021-11-02 22:31:07,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-02 22:31:07,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:31:07,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-02 22:31:07,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-11-02 22:31:07,527 INFO L87 Difference]: Start difference. First operand 5987 states and 6711 transitions. Second operand has 41 states, 39 states have (on average 5.153846153846154) internal successors, (201), 38 states have internal predecessors, (201), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:31:11,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:31:11,177 INFO L93 Difference]: Finished difference Result 6545 states and 7301 transitions. [2021-11-02 22:31:11,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-02 22:31:11,178 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 39 states have (on average 5.153846153846154) internal successors, (201), 38 states have internal predecessors, (201), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 130 [2021-11-02 22:31:11,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:31:11,187 INFO L225 Difference]: With dead ends: 6545 [2021-11-02 22:31:11,187 INFO L226 Difference]: Without dead ends: 5754 [2021-11-02 22:31:11,188 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1042 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=470, Invalid=4642, Unknown=0, NotChecked=0, Total=5112 [2021-11-02 22:31:11,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5754 states. [2021-11-02 22:31:11,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5754 to 5072. [2021-11-02 22:31:11,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5072 states, 5051 states have (on average 1.125915660265294) internal successors, (5687), 5055 states have internal predecessors, (5687), 15 states have call successors, (15), 15 states have call predecessors, (15), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:31:11,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5072 states to 5072 states and 5703 transitions. [2021-11-02 22:31:11,259 INFO L78 Accepts]: Start accepts. Automaton has 5072 states and 5703 transitions. Word has length 130 [2021-11-02 22:31:11,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:31:11,260 INFO L470 AbstractCegarLoop]: Abstraction has 5072 states and 5703 transitions. [2021-11-02 22:31:11,260 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 39 states have (on average 5.153846153846154) internal successors, (201), 38 states have internal predecessors, (201), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:31:11,260 INFO L276 IsEmpty]: Start isEmpty. Operand 5072 states and 5703 transitions. [2021-11-02 22:31:11,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-02 22:31:11,265 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:31:11,266 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:31:11,313 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-02 22:31:11,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-02 22:31:11,480 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:31:11,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:31:11,480 INFO L85 PathProgramCache]: Analyzing trace with hash 679131215, now seen corresponding path program 12 times [2021-11-02 22:31:11,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:31:11,481 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [226552214] [2021-11-02 22:31:11,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:31:11,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:31:11,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:31:11,935 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:31:11,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:31:11,939 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 45 proven. 284 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:31:11,939 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:31:11,940 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [226552214] [2021-11-02 22:31:11,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [226552214] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:31:11,940 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [65659367] [2021-11-02 22:31:11,940 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:31:11,940 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:31:11,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:31:11,941 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:31:11,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-02 22:31:14,480 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-11-02 22:31:14,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:31:14,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 534 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-02 22:31:14,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:31:15,353 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 66 proven. 263 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:31:15,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [65659367] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:31:15,353 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:31:15,354 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21] total 40 [2021-11-02 22:31:15,354 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226830495] [2021-11-02 22:31:15,354 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-02 22:31:15,354 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:31:15,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-02 22:31:15,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1429, Unknown=0, NotChecked=0, Total=1640 [2021-11-02 22:31:15,355 INFO L87 Difference]: Start difference. First operand 5072 states and 5703 transitions. Second operand has 41 states, 40 states have (on average 6.0) internal successors, (240), 38 states have internal predecessors, (240), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:31:17,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:31:17,286 INFO L93 Difference]: Finished difference Result 6395 states and 7151 transitions. [2021-11-02 22:31:17,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-02 22:31:17,287 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 6.0) internal successors, (240), 38 states have internal predecessors, (240), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 130 [2021-11-02 22:31:17,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:31:17,305 INFO L225 Difference]: With dead ends: 6395 [2021-11-02 22:31:17,305 INFO L226 Difference]: Without dead ends: 6395 [2021-11-02 22:31:17,306 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 746 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=455, Invalid=2967, Unknown=0, NotChecked=0, Total=3422 [2021-11-02 22:31:17,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6395 states. [2021-11-02 22:31:17,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6395 to 5652. [2021-11-02 22:31:17,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5652 states, 5631 states have (on average 1.1267980820458179) internal successors, (6345), 5635 states have internal predecessors, (6345), 15 states have call successors, (15), 15 states have call predecessors, (15), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:31:17,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5652 states to 5652 states and 6361 transitions. [2021-11-02 22:31:17,445 INFO L78 Accepts]: Start accepts. Automaton has 5652 states and 6361 transitions. Word has length 130 [2021-11-02 22:31:17,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:31:17,446 INFO L470 AbstractCegarLoop]: Abstraction has 5652 states and 6361 transitions. [2021-11-02 22:31:17,446 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 6.0) internal successors, (240), 38 states have internal predecessors, (240), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:31:17,446 INFO L276 IsEmpty]: Start isEmpty. Operand 5652 states and 6361 transitions. [2021-11-02 22:31:17,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-02 22:31:17,453 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:31:17,454 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:31:17,506 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-02 22:31:17,680 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-02 22:31:17,680 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:31:17,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:31:17,681 INFO L85 PathProgramCache]: Analyzing trace with hash 2081863551, now seen corresponding path program 16 times [2021-11-02 22:31:17,681 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:31:17,681 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1198335263] [2021-11-02 22:31:17,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:31:17,681 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:31:17,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:31:18,238 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:31:18,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:31:18,242 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 66 proven. 258 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-02 22:31:18,242 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:31:18,242 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1198335263] [2021-11-02 22:31:18,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1198335263] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:31:18,242 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1514937850] [2021-11-02 22:31:18,242 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:31:18,242 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:31:18,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:31:18,243 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:31:18,245 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-02 22:31:20,707 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:31:20,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:31:20,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 466 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-02 22:31:20,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:31:20,739 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:31:20,739 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:31:21,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-02 22:31:22,333 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:31:22,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-11-02 22:31:22,598 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 98 proven. 226 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-02 22:31:22,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1514937850] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:31:22,598 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:31:22,599 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 27] total 42 [2021-11-02 22:31:22,599 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399425082] [2021-11-02 22:31:22,599 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-02 22:31:22,599 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:31:22,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-02 22:31:22,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=1676, Unknown=0, NotChecked=0, Total=1806 [2021-11-02 22:31:22,600 INFO L87 Difference]: Start difference. First operand 5652 states and 6361 transitions. Second operand has 43 states, 40 states have (on average 4.5) internal successors, (180), 40 states have internal predecessors, (180), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:31:26,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:31:26,960 INFO L93 Difference]: Finished difference Result 7090 states and 7860 transitions. [2021-11-02 22:31:26,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-02 22:31:26,960 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 40 states have (on average 4.5) internal successors, (180), 40 states have internal predecessors, (180), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 135 [2021-11-02 22:31:26,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:31:26,966 INFO L225 Difference]: With dead ends: 7090 [2021-11-02 22:31:26,966 INFO L226 Difference]: Without dead ends: 7088 [2021-11-02 22:31:26,966 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 974 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=425, Invalid=4267, Unknown=0, NotChecked=0, Total=4692 [2021-11-02 22:31:26,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7088 states. [2021-11-02 22:31:27,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7088 to 5820. [2021-11-02 22:31:27,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5820 states, 5799 states have (on average 1.127090877737541) internal successors, (6536), 5803 states have internal predecessors, (6536), 15 states have call successors, (15), 15 states have call predecessors, (15), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:31:27,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5820 states to 5820 states and 6552 transitions. [2021-11-02 22:31:27,033 INFO L78 Accepts]: Start accepts. Automaton has 5820 states and 6552 transitions. Word has length 135 [2021-11-02 22:31:27,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:31:27,034 INFO L470 AbstractCegarLoop]: Abstraction has 5820 states and 6552 transitions. [2021-11-02 22:31:27,034 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 40 states have (on average 4.5) internal successors, (180), 40 states have internal predecessors, (180), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:31:27,034 INFO L276 IsEmpty]: Start isEmpty. Operand 5820 states and 6552 transitions. [2021-11-02 22:31:27,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-02 22:31:27,039 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:31:27,039 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:31:27,067 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-02 22:31:27,239 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:31:27,239 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:31:27,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:31:27,240 INFO L85 PathProgramCache]: Analyzing trace with hash -1788244024, now seen corresponding path program 13 times [2021-11-02 22:31:27,240 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:31:27,240 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1212948052] [2021-11-02 22:31:27,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:31:27,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:31:27,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:31:27,799 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:31:27,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:31:27,802 INFO L134 CoverageAnalysis]: Checked inductivity of 413 backedges. 71 proven. 336 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:31:27,803 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:31:27,803 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1212948052] [2021-11-02 22:31:27,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1212948052] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:31:27,803 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1675212913] [2021-11-02 22:31:27,803 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:31:27,803 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:31:27,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:31:27,817 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:31:27,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-02 22:31:30,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:31:30,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 582 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-02 22:31:30,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:31:30,473 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:31:30,474 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:31:31,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-02 22:31:31,267 INFO L354 Elim1Store]: treesize reduction 44, result has 18.5 percent of original size [2021-11-02 22:31:31,267 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 37 [2021-11-02 22:31:33,519 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-02 22:31:33,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 23 [2021-11-02 22:31:38,420 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-02 22:31:38,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 44 treesize of output 29 [2021-11-02 22:31:38,443 INFO L134 CoverageAnalysis]: Checked inductivity of 413 backedges. 71 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:31:38,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1675212913] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:31:38,444 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:31:38,444 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 31] total 52 [2021-11-02 22:31:38,444 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103935746] [2021-11-02 22:31:38,445 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-02 22:31:38,445 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:31:38,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-02 22:31:38,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=2528, Unknown=2, NotChecked=0, Total=2652 [2021-11-02 22:31:38,446 INFO L87 Difference]: Start difference. First operand 5820 states and 6552 transitions. Second operand has 52 states, 51 states have (on average 5.0) internal successors, (255), 49 states have internal predecessors, (255), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:32:02,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:32:02,231 INFO L93 Difference]: Finished difference Result 9413 states and 10549 transitions. [2021-11-02 22:32:02,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-02 22:32:02,231 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 5.0) internal successors, (255), 49 states have internal predecessors, (255), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 141 [2021-11-02 22:32:02,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:32:02,237 INFO L225 Difference]: With dead ends: 9413 [2021-11-02 22:32:02,237 INFO L226 Difference]: Without dead ends: 8203 [2021-11-02 22:32:02,238 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1433 ImplicationChecksByTransitivity, 15.2s TimeCoverageRelationStatistics Valid=442, Invalid=7746, Unknown=2, NotChecked=0, Total=8190 [2021-11-02 22:32:02,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8203 states. [2021-11-02 22:32:02,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8203 to 7302. [2021-11-02 22:32:02,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7302 states, 7275 states have (on average 1.124810996563574) internal successors, (8183), 7279 states have internal predecessors, (8183), 21 states have call successors, (21), 21 states have call predecessors, (21), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:32:02,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7302 states to 7302 states and 8205 transitions. [2021-11-02 22:32:02,315 INFO L78 Accepts]: Start accepts. Automaton has 7302 states and 8205 transitions. Word has length 141 [2021-11-02 22:32:02,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:32:02,316 INFO L470 AbstractCegarLoop]: Abstraction has 7302 states and 8205 transitions. [2021-11-02 22:32:02,316 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 51 states have (on average 5.0) internal successors, (255), 49 states have internal predecessors, (255), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:32:02,316 INFO L276 IsEmpty]: Start isEmpty. Operand 7302 states and 8205 transitions. [2021-11-02 22:32:02,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-02 22:32:02,322 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:32:02,322 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:32:02,351 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-02 22:32:02,522 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable61 [2021-11-02 22:32:02,523 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:32:02,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:32:02,523 INFO L85 PathProgramCache]: Analyzing trace with hash -1786481907, now seen corresponding path program 17 times [2021-11-02 22:32:02,523 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:32:02,523 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [253966590] [2021-11-02 22:32:02,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:32:02,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:32:02,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:02,983 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:32:02,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:02,986 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 207 proven. 145 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-02 22:32:02,986 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:32:02,986 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [253966590] [2021-11-02 22:32:02,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [253966590] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:32:02,987 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [550038629] [2021-11-02 22:32:02,987 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:32:02,987 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:32:02,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:32:02,988 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:32:02,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-02 22:32:05,933 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-02 22:32:05,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:32:05,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 549 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-02 22:32:05,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:32:05,968 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:32:05,968 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-02 22:32:05,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-02 22:32:07,272 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 261 proven. 91 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-02 22:32:07,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [550038629] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:32:07,273 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:32:07,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22] total 44 [2021-11-02 22:32:07,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570098887] [2021-11-02 22:32:07,274 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-02 22:32:07,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:32:07,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-02 22:32:07,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=283, Invalid=1609, Unknown=0, NotChecked=0, Total=1892 [2021-11-02 22:32:07,275 INFO L87 Difference]: Start difference. First operand 7302 states and 8205 transitions. Second operand has 44 states, 44 states have (on average 4.840909090909091) internal successors, (213), 41 states have internal predecessors, (213), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:32:08,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:32:08,877 INFO L93 Difference]: Finished difference Result 8116 states and 8926 transitions. [2021-11-02 22:32:08,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-02 22:32:08,878 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 4.840909090909091) internal successors, (213), 41 states have internal predecessors, (213), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 142 [2021-11-02 22:32:08,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:32:08,886 INFO L225 Difference]: With dead ends: 8116 [2021-11-02 22:32:08,886 INFO L226 Difference]: Without dead ends: 7441 [2021-11-02 22:32:08,887 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 917 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=774, Invalid=3918, Unknown=0, NotChecked=0, Total=4692 [2021-11-02 22:32:08,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7441 states. [2021-11-02 22:32:08,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7441 to 6555. [2021-11-02 22:32:08,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6555 states, 6529 states have (on average 1.1144126206157146) internal successors, (7276), 6533 states have internal predecessors, (7276), 20 states have call successors, (20), 20 states have call predecessors, (20), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:32:08,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6555 states to 6555 states and 7297 transitions. [2021-11-02 22:32:08,973 INFO L78 Accepts]: Start accepts. Automaton has 6555 states and 7297 transitions. Word has length 142 [2021-11-02 22:32:08,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:32:08,973 INFO L470 AbstractCegarLoop]: Abstraction has 6555 states and 7297 transitions. [2021-11-02 22:32:08,974 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 4.840909090909091) internal successors, (213), 41 states have internal predecessors, (213), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:32:08,974 INFO L276 IsEmpty]: Start isEmpty. Operand 6555 states and 7297 transitions. [2021-11-02 22:32:08,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-02 22:32:08,981 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:32:08,981 INFO L513 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:32:09,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-02 22:32:09,204 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:32:09,204 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:32:09,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:32:09,204 INFO L85 PathProgramCache]: Analyzing trace with hash 748471727, now seen corresponding path program 5 times [2021-11-02 22:32:09,205 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:32:09,205 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603461056] [2021-11-02 22:32:09,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:32:09,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:32:09,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:09,577 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:32:09,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:09,585 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 28 proven. 425 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-02 22:32:09,586 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:32:09,586 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603461056] [2021-11-02 22:32:09,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [603461056] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:32:09,586 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [993635465] [2021-11-02 22:32:09,586 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:32:09,586 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:32:09,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:32:09,587 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:32:09,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-02 22:32:12,670 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-02 22:32:12,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:32:12,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 606 conjuncts, 133 conjunts are in the unsatisfiable core [2021-11-02 22:32:12,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:32:12,720 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:32:12,721 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:32:15,757 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 22:32:15,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:32:15,764 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-02 22:32:15,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 12 [2021-11-02 22:32:16,266 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 45 proven. 429 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-02 22:32:16,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [993635465] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:32:16,266 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:32:16,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 31] total 49 [2021-11-02 22:32:16,266 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857557655] [2021-11-02 22:32:16,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-02 22:32:16,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:32:16,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-02 22:32:16,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=2280, Unknown=0, NotChecked=0, Total=2450 [2021-11-02 22:32:16,269 INFO L87 Difference]: Start difference. First operand 6555 states and 7297 transitions. Second operand has 50 states, 49 states have (on average 4.8979591836734695) internal successors, (240), 47 states have internal predecessors, (240), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:32:21,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:32:21,024 INFO L93 Difference]: Finished difference Result 10652 states and 11752 transitions. [2021-11-02 22:32:21,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-02 22:32:21,024 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 4.8979591836734695) internal successors, (240), 47 states have internal predecessors, (240), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 145 [2021-11-02 22:32:21,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:32:21,031 INFO L225 Difference]: With dead ends: 10652 [2021-11-02 22:32:21,031 INFO L226 Difference]: Without dead ends: 8831 [2021-11-02 22:32:21,032 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1967 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=547, Invalid=6763, Unknown=0, NotChecked=0, Total=7310 [2021-11-02 22:32:21,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8831 states. [2021-11-02 22:32:21,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8831 to 5388. [2021-11-02 22:32:21,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5388 states, 5368 states have (on average 1.1177347242921014) internal successors, (6000), 5372 states have internal predecessors, (6000), 14 states have call successors, (14), 14 states have call predecessors, (14), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:32:21,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5388 states to 5388 states and 6015 transitions. [2021-11-02 22:32:21,090 INFO L78 Accepts]: Start accepts. Automaton has 5388 states and 6015 transitions. Word has length 145 [2021-11-02 22:32:21,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:32:21,091 INFO L470 AbstractCegarLoop]: Abstraction has 5388 states and 6015 transitions. [2021-11-02 22:32:21,091 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 49 states have (on average 4.8979591836734695) internal successors, (240), 47 states have internal predecessors, (240), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:32:21,091 INFO L276 IsEmpty]: Start isEmpty. Operand 5388 states and 6015 transitions. [2021-11-02 22:32:21,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-02 22:32:21,095 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:32:21,096 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:32:21,132 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-02 22:32:21,296 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:32:21,296 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:32:21,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:32:21,297 INFO L85 PathProgramCache]: Analyzing trace with hash -1936055093, now seen corresponding path program 14 times [2021-11-02 22:32:21,297 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:32:21,297 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301011314] [2021-11-02 22:32:21,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:32:21,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:32:21,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:21,819 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:32:21,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:21,822 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 66 proven. 370 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:32:21,822 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:32:21,822 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301011314] [2021-11-02 22:32:21,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [301011314] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:32:21,822 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2092782315] [2021-11-02 22:32:21,822 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:32:21,823 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:32:21,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:32:21,823 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:32:21,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-02 22:32:24,863 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:32:24,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:32:24,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 593 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-02 22:32:24,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:32:25,832 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 91 proven. 345 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:32:25,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2092782315] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:32:25,832 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:32:25,832 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 35 [2021-11-02 22:32:25,832 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199527015] [2021-11-02 22:32:25,833 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-02 22:32:25,833 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:32:25,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-02 22:32:25,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1100, Unknown=0, NotChecked=0, Total=1260 [2021-11-02 22:32:25,833 INFO L87 Difference]: Start difference. First operand 5388 states and 6015 transitions. Second operand has 36 states, 35 states have (on average 5.485714285714286) internal successors, (192), 33 states have internal predecessors, (192), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:32:27,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:32:27,616 INFO L93 Difference]: Finished difference Result 6607 states and 7363 transitions. [2021-11-02 22:32:27,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-02 22:32:27,616 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 5.485714285714286) internal successors, (192), 33 states have internal predecessors, (192), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 145 [2021-11-02 22:32:27,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:32:27,621 INFO L225 Difference]: With dead ends: 6607 [2021-11-02 22:32:27,621 INFO L226 Difference]: Without dead ends: 6607 [2021-11-02 22:32:27,622 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 132 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 511 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=271, Invalid=1985, Unknown=0, NotChecked=0, Total=2256 [2021-11-02 22:32:27,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6607 states. [2021-11-02 22:32:27,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6607 to 5982. [2021-11-02 22:32:27,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5982 states, 5962 states have (on average 1.1194230124119422) internal successors, (6674), 5966 states have internal predecessors, (6674), 14 states have call successors, (14), 14 states have call predecessors, (14), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:32:27,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5982 states to 5982 states and 6689 transitions. [2021-11-02 22:32:27,702 INFO L78 Accepts]: Start accepts. Automaton has 5982 states and 6689 transitions. Word has length 145 [2021-11-02 22:32:27,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:32:27,703 INFO L470 AbstractCegarLoop]: Abstraction has 5982 states and 6689 transitions. [2021-11-02 22:32:27,703 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 5.485714285714286) internal successors, (192), 33 states have internal predecessors, (192), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:32:27,703 INFO L276 IsEmpty]: Start isEmpty. Operand 5982 states and 6689 transitions. [2021-11-02 22:32:27,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-02 22:32:27,708 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:32:27,708 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:32:27,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-02 22:32:27,908 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2021-11-02 22:32:27,909 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:32:27,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:32:27,909 INFO L85 PathProgramCache]: Analyzing trace with hash -2073657750, now seen corresponding path program 18 times [2021-11-02 22:32:27,909 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:32:27,909 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2042759037] [2021-11-02 22:32:27,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:32:27,910 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:32:28,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:29,973 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:32:29,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:29,978 INFO L134 CoverageAnalysis]: Checked inductivity of 501 backedges. 41 proven. 460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:32:29,979 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:32:29,979 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2042759037] [2021-11-02 22:32:29,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2042759037] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:32:29,979 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658318987] [2021-11-02 22:32:29,979 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:32:29,979 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:32:29,979 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:32:29,982 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:32:29,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-02 22:32:33,858 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-11-02 22:32:33,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:32:33,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 560 conjuncts, 70 conjunts are in the unsatisfiable core [2021-11-02 22:32:33,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:32:34,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-02 22:32:35,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-02 22:32:35,306 INFO L134 CoverageAnalysis]: Checked inductivity of 501 backedges. 41 proven. 340 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-02 22:32:35,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658318987] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:32:35,307 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:32:35,307 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 27] total 55 [2021-11-02 22:32:35,307 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386138628] [2021-11-02 22:32:35,307 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-02 22:32:35,308 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:32:35,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-02 22:32:35,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=2839, Unknown=0, NotChecked=0, Total=2970 [2021-11-02 22:32:35,308 INFO L87 Difference]: Start difference. First operand 5982 states and 6689 transitions. Second operand has 55 states, 53 states have (on average 3.6792452830188678) internal successors, (195), 52 states have internal predecessors, (195), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:32:47,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:32:47,742 INFO L93 Difference]: Finished difference Result 9729 states and 10754 transitions. [2021-11-02 22:32:47,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-11-02 22:32:47,742 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 53 states have (on average 3.6792452830188678) internal successors, (195), 52 states have internal predecessors, (195), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 146 [2021-11-02 22:32:47,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:32:47,750 INFO L225 Difference]: With dead ends: 9729 [2021-11-02 22:32:47,751 INFO L226 Difference]: Without dead ends: 9627 [2021-11-02 22:32:47,751 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2221 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=682, Invalid=12658, Unknown=0, NotChecked=0, Total=13340 [2021-11-02 22:32:47,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9627 states. [2021-11-02 22:32:47,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9627 to 7065. [2021-11-02 22:32:47,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7065 states, 7044 states have (on average 1.1198182850653038) internal successors, (7888), 7048 states have internal predecessors, (7888), 15 states have call successors, (15), 15 states have call predecessors, (15), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:32:47,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7065 states to 7065 states and 7904 transitions. [2021-11-02 22:32:47,893 INFO L78 Accepts]: Start accepts. Automaton has 7065 states and 7904 transitions. Word has length 146 [2021-11-02 22:32:47,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:32:47,893 INFO L470 AbstractCegarLoop]: Abstraction has 7065 states and 7904 transitions. [2021-11-02 22:32:47,893 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 53 states have (on average 3.6792452830188678) internal successors, (195), 52 states have internal predecessors, (195), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:32:47,894 INFO L276 IsEmpty]: Start isEmpty. Operand 7065 states and 7904 transitions. [2021-11-02 22:32:47,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-11-02 22:32:47,899 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:32:47,899 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:32:47,938 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2021-11-02 22:32:48,104 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable65 [2021-11-02 22:32:48,104 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:32:48,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:32:48,105 INFO L85 PathProgramCache]: Analyzing trace with hash -1471105017, now seen corresponding path program 19 times [2021-11-02 22:32:48,105 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:32:48,105 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730469409] [2021-11-02 22:32:48,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:32:48,105 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:32:48,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:48,665 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:32:48,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:48,668 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 91 proven. 323 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-02 22:32:48,668 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:32:48,668 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730469409] [2021-11-02 22:32:48,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1730469409] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:32:48,668 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1498918862] [2021-11-02 22:32:48,669 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:32:48,669 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:32:48,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:32:48,669 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:32:48,670 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-02 22:32:51,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:51,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-02 22:32:51,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:32:52,834 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 120 proven. 294 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-02 22:32:52,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1498918862] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:32:52,835 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:32:52,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 41 [2021-11-02 22:32:52,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790228633] [2021-11-02 22:32:52,836 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-02 22:32:52,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:32:52,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-02 22:32:52,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=1513, Unknown=0, NotChecked=0, Total=1722 [2021-11-02 22:32:52,837 INFO L87 Difference]: Start difference. First operand 7065 states and 7904 transitions. Second operand has 42 states, 39 states have (on average 4.487179487179487) internal successors, (175), 39 states have internal predecessors, (175), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:32:55,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:32:55,648 INFO L93 Difference]: Finished difference Result 8342 states and 9259 transitions. [2021-11-02 22:32:55,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-02 22:32:55,648 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 39 states have (on average 4.487179487179487) internal successors, (175), 39 states have internal predecessors, (175), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 150 [2021-11-02 22:32:55,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:32:55,656 INFO L225 Difference]: With dead ends: 8342 [2021-11-02 22:32:55,656 INFO L226 Difference]: Without dead ends: 8340 [2021-11-02 22:32:55,656 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 135 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 820 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=348, Invalid=2622, Unknown=0, NotChecked=0, Total=2970 [2021-11-02 22:32:55,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8340 states. [2021-11-02 22:32:55,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8340 to 7184. [2021-11-02 22:32:55,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7184 states, 7163 states have (on average 1.1202010330866956) internal successors, (8024), 7167 states have internal predecessors, (8024), 15 states have call successors, (15), 15 states have call predecessors, (15), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:32:55,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7184 states to 7184 states and 8040 transitions. [2021-11-02 22:32:55,766 INFO L78 Accepts]: Start accepts. Automaton has 7184 states and 8040 transitions. Word has length 150 [2021-11-02 22:32:55,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:32:55,766 INFO L470 AbstractCegarLoop]: Abstraction has 7184 states and 8040 transitions. [2021-11-02 22:32:55,767 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 39 states have (on average 4.487179487179487) internal successors, (175), 39 states have internal predecessors, (175), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:32:55,767 INFO L276 IsEmpty]: Start isEmpty. Operand 7184 states and 8040 transitions. [2021-11-02 22:32:55,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-02 22:32:55,773 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:32:55,773 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:32:55,805 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2021-11-02 22:32:55,973 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:32:55,974 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:32:55,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:32:55,974 INFO L85 PathProgramCache]: Analyzing trace with hash 1673182668, now seen corresponding path program 15 times [2021-11-02 22:32:55,974 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:32:55,974 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1790799310] [2021-11-02 22:32:55,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:32:55,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:32:56,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:56,653 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:32:56,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:56,656 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 81 proven. 444 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:32:56,657 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:32:56,657 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1790799310] [2021-11-02 22:32:56,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1790799310] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:32:56,657 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [361706689] [2021-11-02 22:32:56,657 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:32:56,657 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:32:56,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:32:56,658 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:32:56,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-02 22:33:00,169 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-02 22:33:00,170 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:33:00,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 641 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-02 22:33:00,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:00,212 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:33:00,883 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-02 22:33:00,958 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-02 22:33:00,958 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-02 22:33:03,773 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-02 22:33:03,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 23 [2021-11-02 22:33:03,797 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 81 proven. 444 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:33:03,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [361706689] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:03,797 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:33:03,798 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 49 [2021-11-02 22:33:03,798 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216562862] [2021-11-02 22:33:03,798 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-02 22:33:03,798 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:03,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-02 22:33:03,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=2234, Unknown=0, NotChecked=0, Total=2352 [2021-11-02 22:33:03,799 INFO L87 Difference]: Start difference. First operand 7184 states and 8040 transitions. Second operand has 49 states, 48 states have (on average 5.854166666666667) internal successors, (281), 46 states have internal predecessors, (281), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:45,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:45,612 INFO L93 Difference]: Finished difference Result 12333 states and 13778 transitions. [2021-11-02 22:33:45,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-02 22:33:45,612 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 5.854166666666667) internal successors, (281), 46 states have internal predecessors, (281), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 156 [2021-11-02 22:33:45,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:45,620 INFO L225 Difference]: With dead ends: 12333 [2021-11-02 22:33:45,620 INFO L226 Difference]: Without dead ends: 10473 [2021-11-02 22:33:45,620 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 135 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 479 ImplicationChecksByTransitivity, 38.5s TimeCoverageRelationStatistics Valid=239, Invalid=3793, Unknown=0, NotChecked=0, Total=4032 [2021-11-02 22:33:45,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10473 states. [2021-11-02 22:33:45,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10473 to 9919. [2021-11-02 22:33:45,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9919 states, 9891 states have (on average 1.1212213123041148) internal successors, (11090), 9895 states have internal predecessors, (11090), 22 states have call successors, (22), 22 states have call predecessors, (22), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:45,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9919 states to 9919 states and 11113 transitions. [2021-11-02 22:33:45,724 INFO L78 Accepts]: Start accepts. Automaton has 9919 states and 11113 transitions. Word has length 156 [2021-11-02 22:33:45,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:45,725 INFO L470 AbstractCegarLoop]: Abstraction has 9919 states and 11113 transitions. [2021-11-02 22:33:45,725 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 5.854166666666667) internal successors, (281), 46 states have internal predecessors, (281), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:45,725 INFO L276 IsEmpty]: Start isEmpty. Operand 9919 states and 11113 transitions. [2021-11-02 22:33:45,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-02 22:33:45,733 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:45,734 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:45,774 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-02 22:33:45,935 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:45,935 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:33:45,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:45,936 INFO L85 PathProgramCache]: Analyzing trace with hash 1135233413, now seen corresponding path program 20 times [2021-11-02 22:33:45,936 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:45,936 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266353779] [2021-11-02 22:33:45,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:45,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:45,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:46,541 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:46,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:46,546 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 264 proven. 181 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-02 22:33:46,546 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:46,546 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266353779] [2021-11-02 22:33:46,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [266353779] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:46,546 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1093097395] [2021-11-02 22:33:46,546 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:33:46,547 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:46,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:46,548 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:46,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-02 22:33:50,167 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:33:50,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:33:50,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 601 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-02 22:33:50,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:50,212 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:33:50,212 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-02 22:33:50,215 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-02 22:33:51,525 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 325 proven. 120 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-02 22:33:51,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1093097395] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:51,526 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:33:51,526 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 49 [2021-11-02 22:33:51,526 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379345199] [2021-11-02 22:33:51,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-02 22:33:51,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:51,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-02 22:33:51,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=1997, Unknown=0, NotChecked=0, Total=2352 [2021-11-02 22:33:51,527 INFO L87 Difference]: Start difference. First operand 9919 states and 11113 transitions. Second operand has 49 states, 49 states have (on average 4.795918367346939) internal successors, (235), 46 states have internal predecessors, (235), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:53,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:53,274 INFO L93 Difference]: Finished difference Result 11150 states and 12264 transitions. [2021-11-02 22:33:53,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-02 22:33:53,274 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 4.795918367346939) internal successors, (235), 46 states have internal predecessors, (235), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 157 [2021-11-02 22:33:53,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:53,283 INFO L225 Difference]: With dead ends: 11150 [2021-11-02 22:33:53,284 INFO L226 Difference]: Without dead ends: 10419 [2021-11-02 22:33:53,284 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1142 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=967, Invalid=4733, Unknown=0, NotChecked=0, Total=5700 [2021-11-02 22:33:53,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10419 states. [2021-11-02 22:33:53,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10419 to 9158. [2021-11-02 22:33:53,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9158 states, 9130 states have (on average 1.1140197152245346) internal successors, (10171), 9134 states have internal predecessors, (10171), 22 states have call successors, (22), 22 states have call predecessors, (22), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:53,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9158 states to 9158 states and 10194 transitions. [2021-11-02 22:33:53,412 INFO L78 Accepts]: Start accepts. Automaton has 9158 states and 10194 transitions. Word has length 157 [2021-11-02 22:33:53,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:53,412 INFO L470 AbstractCegarLoop]: Abstraction has 9158 states and 10194 transitions. [2021-11-02 22:33:53,412 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 4.795918367346939) internal successors, (235), 46 states have internal predecessors, (235), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:53,413 INFO L276 IsEmpty]: Start isEmpty. Operand 9158 states and 10194 transitions. [2021-11-02 22:33:53,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-02 22:33:53,418 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:53,418 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:53,455 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-02 22:33:53,620 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:53,620 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:33:53,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:53,620 INFO L85 PathProgramCache]: Analyzing trace with hash -1318903191, now seen corresponding path program 16 times [2021-11-02 22:33:53,621 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:53,621 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142638394] [2021-11-02 22:33:53,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:53,621 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:53,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:54,196 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:54,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:54,200 INFO L134 CoverageAnalysis]: Checked inductivity of 564 backedges. 91 proven. 467 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:33:54,200 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:54,200 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142638394] [2021-11-02 22:33:54,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [142638394] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:54,201 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [747106438] [2021-11-02 22:33:54,201 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:33:54,201 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:54,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:54,202 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:54,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-02 22:33:57,966 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:33:57,966 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:33:57,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 611 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-02 22:33:57,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:57,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:33:58,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-02 22:33:59,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-02 22:33:59,215 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-02 22:33:59,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2021-11-02 22:34:02,253 INFO L354 Elim1Store]: treesize reduction 39, result has 23.5 percent of original size [2021-11-02 22:34:02,253 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 26 [2021-11-02 22:34:02,591 INFO L134 CoverageAnalysis]: Checked inductivity of 564 backedges. 128 proven. 430 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:34:02,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [747106438] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:02,591 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:34:02,591 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 27] total 50 [2021-11-02 22:34:02,591 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881315224] [2021-11-02 22:34:02,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-02 22:34:02,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:34:02,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-02 22:34:02,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=2347, Unknown=0, NotChecked=0, Total=2550 [2021-11-02 22:34:02,593 INFO L87 Difference]: Start difference. First operand 9158 states and 10194 transitions. Second operand has 51 states, 49 states have (on average 6.122448979591836) internal successors, (300), 48 states have internal predecessors, (300), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:10,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:34:10,934 INFO L93 Difference]: Finished difference Result 10765 states and 11969 transitions. [2021-11-02 22:34:10,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-02 22:34:10,935 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 49 states have (on average 6.122448979591836) internal successors, (300), 48 states have internal predecessors, (300), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 160 [2021-11-02 22:34:10,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:34:10,943 INFO L225 Difference]: With dead ends: 10765 [2021-11-02 22:34:10,943 INFO L226 Difference]: Without dead ends: 10765 [2021-11-02 22:34:10,944 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1161 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=543, Invalid=5777, Unknown=0, NotChecked=0, Total=6320 [2021-11-02 22:34:10,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10765 states. [2021-11-02 22:34:11,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10765 to 9902. [2021-11-02 22:34:11,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9902 states, 9874 states have (on average 1.11545472959287) internal successors, (11014), 9878 states have internal predecessors, (11014), 22 states have call successors, (22), 22 states have call predecessors, (22), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:11,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9902 states to 9902 states and 11037 transitions. [2021-11-02 22:34:11,069 INFO L78 Accepts]: Start accepts. Automaton has 9902 states and 11037 transitions. Word has length 160 [2021-11-02 22:34:11,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:34:11,069 INFO L470 AbstractCegarLoop]: Abstraction has 9902 states and 11037 transitions. [2021-11-02 22:34:11,070 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 49 states have (on average 6.122448979591836) internal successors, (300), 48 states have internal predecessors, (300), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:11,070 INFO L276 IsEmpty]: Start isEmpty. Operand 9902 states and 11037 transitions. [2021-11-02 22:34:11,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-02 22:34:11,077 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:34:11,077 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:34:11,116 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-02 22:34:11,289 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2021-11-02 22:34:11,289 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:34:11,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:34:11,290 INFO L85 PathProgramCache]: Analyzing trace with hash -1425115000, now seen corresponding path program 21 times [2021-11-02 22:34:11,290 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:34:11,290 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2003538867] [2021-11-02 22:34:11,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:11,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:34:11,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:14,078 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:34:14,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:14,082 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 46 proven. 585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:34:14,082 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:34:14,082 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2003538867] [2021-11-02 22:34:14,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2003538867] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:14,082 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [953944128] [2021-11-02 22:34:14,082 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:34:14,082 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:14,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:34:14,084 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:34:14,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-02 22:34:19,103 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-02 22:34:19,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:34:19,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 612 conjuncts, 119 conjunts are in the unsatisfiable core [2021-11-02 22:34:19,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:34:19,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:34:19,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-02 22:34:22,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 24 [2021-11-02 22:34:22,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-02 22:34:22,975 INFO L354 Elim1Store]: treesize reduction 38, result has 20.8 percent of original size [2021-11-02 22:34:22,976 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 39 [2021-11-02 22:34:28,556 INFO L354 Elim1Store]: treesize reduction 55, result has 32.1 percent of original size [2021-11-02 22:34:28,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 63 treesize of output 64 [2021-11-02 22:34:28,652 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 10 proven. 621 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:34:28,652 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [953944128] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:28,652 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:34:28,653 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 47] total 87 [2021-11-02 22:34:28,653 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938211953] [2021-11-02 22:34:28,653 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-02 22:34:28,653 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:34:28,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-02 22:34:28,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=7222, Unknown=0, NotChecked=0, Total=7482 [2021-11-02 22:34:28,654 INFO L87 Difference]: Start difference. First operand 9902 states and 11037 transitions. Second operand has 87 states, 85 states have (on average 3.635294117647059) internal successors, (309), 84 states have internal predecessors, (309), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:45,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:34:45,976 INFO L93 Difference]: Finished difference Result 11946 states and 13263 transitions. [2021-11-02 22:34:45,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-11-02 22:34:45,977 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 85 states have (on average 3.635294117647059) internal successors, (309), 84 states have internal predecessors, (309), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 161 [2021-11-02 22:34:45,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:34:45,987 INFO L225 Difference]: With dead ends: 11946 [2021-11-02 22:34:45,987 INFO L226 Difference]: Without dead ends: 11889 [2021-11-02 22:34:45,988 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4603 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=933, Invalid=20237, Unknown=0, NotChecked=0, Total=21170 [2021-11-02 22:34:45,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11889 states. [2021-11-02 22:34:46,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11889 to 11292. [2021-11-02 22:34:46,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11292 states, 11263 states have (on average 1.1168427594779367) internal successors, (12579), 11267 states have internal predecessors, (12579), 23 states have call successors, (23), 23 states have call predecessors, (23), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:46,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11292 states to 11292 states and 12603 transitions. [2021-11-02 22:34:46,112 INFO L78 Accepts]: Start accepts. Automaton has 11292 states and 12603 transitions. Word has length 161 [2021-11-02 22:34:46,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:34:46,112 INFO L470 AbstractCegarLoop]: Abstraction has 11292 states and 12603 transitions. [2021-11-02 22:34:46,112 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 85 states have (on average 3.635294117647059) internal successors, (309), 84 states have internal predecessors, (309), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:46,113 INFO L276 IsEmpty]: Start isEmpty. Operand 11292 states and 12603 transitions. [2021-11-02 22:34:46,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2021-11-02 22:34:46,118 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:34:46,118 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:34:46,161 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-02 22:34:46,319 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:46,319 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:34:46,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:34:46,319 INFO L85 PathProgramCache]: Analyzing trace with hash 1529073995, now seen corresponding path program 22 times [2021-11-02 22:34:46,319 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:34:46,320 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856360054] [2021-11-02 22:34:46,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:46,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:34:46,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:46,986 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:34:46,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:46,989 INFO L134 CoverageAnalysis]: Checked inductivity of 668 backedges. 120 proven. 395 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-02 22:34:46,989 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:34:46,989 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [856360054] [2021-11-02 22:34:46,989 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [856360054] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:46,989 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188446636] [2021-11-02 22:34:46,989 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:34:46,990 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:46,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:34:46,990 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:34:46,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-02 22:34:51,391 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:34:51,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:34:51,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 558 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-02 22:34:51,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:34:51,426 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:34:51,426 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:34:52,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-02 22:34:53,564 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:34:53,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2021-11-02 22:34:53,871 INFO L134 CoverageAnalysis]: Checked inductivity of 668 backedges. 162 proven. 353 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-02 22:34:53,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [188446636] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:53,872 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:34:53,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 31] total 48 [2021-11-02 22:34:53,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075691633] [2021-11-02 22:34:53,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-02 22:34:53,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:34:53,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-02 22:34:53,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2191, Unknown=0, NotChecked=0, Total=2352 [2021-11-02 22:34:53,873 INFO L87 Difference]: Start difference. First operand 11292 states and 12603 transitions. Second operand has 49 states, 46 states have (on average 4.695652173913044) internal successors, (216), 46 states have internal predecessors, (216), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:01,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:01,479 INFO L93 Difference]: Finished difference Result 17234 states and 19084 transitions. [2021-11-02 22:35:01,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-02 22:35:01,480 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 46 states have (on average 4.695652173913044) internal successors, (216), 46 states have internal predecessors, (216), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 165 [2021-11-02 22:35:01,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:01,495 INFO L225 Difference]: With dead ends: 17234 [2021-11-02 22:35:01,495 INFO L226 Difference]: Without dead ends: 17230 [2021-11-02 22:35:01,496 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1493 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=569, Invalid=6403, Unknown=0, NotChecked=0, Total=6972 [2021-11-02 22:35:01,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17230 states. [2021-11-02 22:35:01,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17230 to 11425. [2021-11-02 22:35:01,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11425 states, 11396 states have (on average 1.117146367146367) internal successors, (12731), 11400 states have internal predecessors, (12731), 23 states have call successors, (23), 23 states have call predecessors, (23), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:01,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11425 states to 11425 states and 12755 transitions. [2021-11-02 22:35:01,748 INFO L78 Accepts]: Start accepts. Automaton has 11425 states and 12755 transitions. Word has length 165 [2021-11-02 22:35:01,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:01,749 INFO L470 AbstractCegarLoop]: Abstraction has 11425 states and 12755 transitions. [2021-11-02 22:35:01,749 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 46 states have (on average 4.695652173913044) internal successors, (216), 46 states have internal predecessors, (216), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:01,749 INFO L276 IsEmpty]: Start isEmpty. Operand 11425 states and 12755 transitions. [2021-11-02 22:35:01,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-11-02 22:35:01,755 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:01,755 INFO L513 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 12, 12, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:01,792 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-02 22:35:01,955 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable71 [2021-11-02 22:35:01,955 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:35:01,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:01,957 INFO L85 PathProgramCache]: Analyzing trace with hash 334833255, now seen corresponding path program 6 times [2021-11-02 22:35:01,957 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:01,957 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [852538970] [2021-11-02 22:35:01,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:01,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:02,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:02,425 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:02,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:02,431 INFO L134 CoverageAnalysis]: Checked inductivity of 691 backedges. 45 proven. 605 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-02 22:35:02,432 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:02,432 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [852538970] [2021-11-02 22:35:02,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [852538970] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:02,432 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1324122748] [2021-11-02 22:35:02,432 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:35:02,433 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:02,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:02,434 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:02,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-02 22:35:07,044 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2021-11-02 22:35:07,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:35:07,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 695 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-02 22:35:07,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:08,312 INFO L134 CoverageAnalysis]: Checked inductivity of 691 backedges. 66 proven. 584 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-02 22:35:08,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1324122748] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:08,312 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:35:08,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 22] total 34 [2021-11-02 22:35:08,313 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648530465] [2021-11-02 22:35:08,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-02 22:35:08,313 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:08,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-02 22:35:08,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1076, Unknown=0, NotChecked=0, Total=1190 [2021-11-02 22:35:08,314 INFO L87 Difference]: Start difference. First operand 11425 states and 12755 transitions. Second operand has 35 states, 34 states have (on average 6.5) internal successors, (221), 32 states have internal predecessors, (221), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:11,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:11,839 INFO L93 Difference]: Finished difference Result 12771 states and 14080 transitions. [2021-11-02 22:35:11,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-02 22:35:11,839 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 6.5) internal successors, (221), 32 states have internal predecessors, (221), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 167 [2021-11-02 22:35:11,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:11,849 INFO L225 Difference]: With dead ends: 12771 [2021-11-02 22:35:11,849 INFO L226 Difference]: Without dead ends: 11207 [2021-11-02 22:35:11,850 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 154 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 906 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=577, Invalid=4115, Unknown=0, NotChecked=0, Total=4692 [2021-11-02 22:35:11,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11207 states. [2021-11-02 22:35:11,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11207 to 9980. [2021-11-02 22:35:11,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9980 states, 9957 states have (on average 1.1198152053831476) internal successors, (11150), 9961 states have internal predecessors, (11150), 17 states have call successors, (17), 17 states have call predecessors, (17), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:11,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9980 states to 9980 states and 11168 transitions. [2021-11-02 22:35:11,954 INFO L78 Accepts]: Start accepts. Automaton has 9980 states and 11168 transitions. Word has length 167 [2021-11-02 22:35:11,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:11,954 INFO L470 AbstractCegarLoop]: Abstraction has 9980 states and 11168 transitions. [2021-11-02 22:35:11,954 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 6.5) internal successors, (221), 32 states have internal predecessors, (221), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:11,954 INFO L276 IsEmpty]: Start isEmpty. Operand 9980 states and 11168 transitions. [2021-11-02 22:35:11,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2021-11-02 22:35:11,959 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:11,960 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:12,008 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-02 22:35:12,176 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:12,176 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:35:12,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:12,177 INFO L85 PathProgramCache]: Analyzing trace with hash 1107669358, now seen corresponding path program 17 times [2021-11-02 22:35:12,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:12,177 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648356913] [2021-11-02 22:35:12,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:12,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:12,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:13,025 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:13,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:13,028 INFO L134 CoverageAnalysis]: Checked inductivity of 664 backedges. 91 proven. 567 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:35:13,028 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:13,029 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648356913] [2021-11-02 22:35:13,029 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [648356913] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:13,029 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [112506399] [2021-11-02 22:35:13,029 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:35:13,029 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:13,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:13,030 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:13,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-02 22:35:18,022 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2021-11-02 22:35:18,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:35:18,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 700 conjuncts, 89 conjunts are in the unsatisfiable core [2021-11-02 22:35:18,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:18,062 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:35:18,062 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:35:19,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 30 [2021-11-02 22:35:19,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:19,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-02 22:35:22,895 INFO L354 Elim1Store]: treesize reduction 43, result has 18.9 percent of original size [2021-11-02 22:35:22,896 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 25 [2021-11-02 22:35:23,308 INFO L134 CoverageAnalysis]: Checked inductivity of 664 backedges. 105 proven. 559 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:23,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [112506399] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:23,309 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:35:23,309 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 33] total 60 [2021-11-02 22:35:23,309 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159308273] [2021-11-02 22:35:23,309 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-02 22:35:23,310 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:23,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-02 22:35:23,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=3374, Unknown=0, NotChecked=0, Total=3540 [2021-11-02 22:35:23,311 INFO L87 Difference]: Start difference. First operand 9980 states and 11168 transitions. Second operand has 60 states, 59 states have (on average 5.52542372881356) internal successors, (326), 57 states have internal predecessors, (326), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:34,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:34,791 INFO L93 Difference]: Finished difference Result 15809 states and 17647 transitions. [2021-11-02 22:35:34,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-11-02 22:35:34,791 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 5.52542372881356) internal successors, (326), 57 states have internal predecessors, (326), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 171 [2021-11-02 22:35:34,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:34,802 INFO L225 Difference]: With dead ends: 15809 [2021-11-02 22:35:34,802 INFO L226 Difference]: Without dead ends: 13116 [2021-11-02 22:35:34,803 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 141 SyntacticMatches, 1 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3518 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=966, Invalid=16326, Unknown=0, NotChecked=0, Total=17292 [2021-11-02 22:35:34,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13116 states. [2021-11-02 22:35:34,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13116 to 12394. [2021-11-02 22:35:34,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12394 states, 12364 states have (on average 1.1196214817211259) internal successors, (13843), 12368 states have internal predecessors, (13843), 24 states have call successors, (24), 24 states have call predecessors, (24), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:34,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12394 states to 12394 states and 13868 transitions. [2021-11-02 22:35:34,921 INFO L78 Accepts]: Start accepts. Automaton has 12394 states and 13868 transitions. Word has length 171 [2021-11-02 22:35:34,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:34,921 INFO L470 AbstractCegarLoop]: Abstraction has 12394 states and 13868 transitions. [2021-11-02 22:35:34,921 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 59 states have (on average 5.52542372881356) internal successors, (326), 57 states have internal predecessors, (326), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:34,921 INFO L276 IsEmpty]: Start isEmpty. Operand 12394 states and 13868 transitions. [2021-11-02 22:35:34,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-11-02 22:35:34,927 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:34,927 INFO L513 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:34,962 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-02 22:35:35,128 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:35,128 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:35:35,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:35,128 INFO L85 PathProgramCache]: Analyzing trace with hash -492241983, now seen corresponding path program 23 times [2021-11-02 22:35:35,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:35,129 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507351603] [2021-11-02 22:35:35,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:35,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:35,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:35,684 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:35,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:35,688 INFO L134 CoverageAnalysis]: Checked inductivity of 739 backedges. 328 proven. 221 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-02 22:35:35,688 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:35,688 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507351603] [2021-11-02 22:35:35,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507351603] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:35,688 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1448443645] [2021-11-02 22:35:35,688 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:35:35,689 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:35,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:35,690 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:35,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-02 22:35:40,880 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-11-02 22:35:40,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:35:40,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 653 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-02 22:35:40,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:40,944 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:35:40,944 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-02 22:35:40,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-02 22:35:42,606 INFO L134 CoverageAnalysis]: Checked inductivity of 739 backedges. 396 proven. 153 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-02 22:35:42,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1448443645] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:42,607 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:35:42,607 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 26] total 52 [2021-11-02 22:35:42,607 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871647531] [2021-11-02 22:35:42,608 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-02 22:35:42,608 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:42,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-02 22:35:42,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=407, Invalid=2245, Unknown=0, NotChecked=0, Total=2652 [2021-11-02 22:35:42,609 INFO L87 Difference]: Start difference. First operand 12394 states and 13868 transitions. Second operand has 52 states, 52 states have (on average 4.9423076923076925) internal successors, (257), 49 states have internal predecessors, (257), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:44,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:44,662 INFO L93 Difference]: Finished difference Result 14293 states and 15680 transitions. [2021-11-02 22:35:44,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-02 22:35:44,663 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 4.9423076923076925) internal successors, (257), 49 states have internal predecessors, (257), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 172 [2021-11-02 22:35:44,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:44,678 INFO L225 Difference]: With dead ends: 14293 [2021-11-02 22:35:44,678 INFO L226 Difference]: Without dead ends: 13369 [2021-11-02 22:35:44,679 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1255 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1056, Invalid=5264, Unknown=0, NotChecked=0, Total=6320 [2021-11-02 22:35:44,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13369 states. [2021-11-02 22:35:44,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13369 to 11473. [2021-11-02 22:35:44,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11473 states, 11443 states have (on average 1.1127326749978153) internal successors, (12733), 11447 states have internal predecessors, (12733), 24 states have call successors, (24), 24 states have call predecessors, (24), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:44,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11473 states to 11473 states and 12758 transitions. [2021-11-02 22:35:44,798 INFO L78 Accepts]: Start accepts. Automaton has 11473 states and 12758 transitions. Word has length 172 [2021-11-02 22:35:44,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:44,798 INFO L470 AbstractCegarLoop]: Abstraction has 11473 states and 12758 transitions. [2021-11-02 22:35:44,798 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 4.9423076923076925) internal successors, (257), 49 states have internal predecessors, (257), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:44,798 INFO L276 IsEmpty]: Start isEmpty. Operand 11473 states and 12758 transitions. [2021-11-02 22:35:44,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-11-02 22:35:44,804 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:44,804 INFO L513 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:44,843 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-02 22:35:45,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable74 [2021-11-02 22:35:45,005 INFO L402 AbstractCegarLoop]: === Iteration 76 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:35:45,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:45,005 INFO L85 PathProgramCache]: Analyzing trace with hash -486963455, now seen corresponding path program 24 times [2021-11-02 22:35:45,005 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:45,005 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117608776] [2021-11-02 22:35:45,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:45,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:45,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:45,538 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:45,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:45,542 INFO L134 CoverageAnalysis]: Checked inductivity of 739 backedges. 332 proven. 217 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-02 22:35:45,542 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:45,542 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117608776] [2021-11-02 22:35:45,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2117608776] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:45,543 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1812327457] [2021-11-02 22:35:45,543 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:35:45,543 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:45,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:45,544 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:45,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-02 22:35:51,233 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2021-11-02 22:35:51,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:35:51,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 653 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-02 22:35:51,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:51,271 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:35:51,271 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:35:52,927 INFO L134 CoverageAnalysis]: Checked inductivity of 739 backedges. 396 proven. 153 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-02 22:35:52,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1812327457] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:52,927 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:35:52,927 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 27] total 54 [2021-11-02 22:35:52,927 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919295604] [2021-11-02 22:35:52,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-02 22:35:52,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:52,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-02 22:35:52,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=2418, Unknown=0, NotChecked=0, Total=2862 [2021-11-02 22:35:52,928 INFO L87 Difference]: Start difference. First operand 11473 states and 12758 transitions. Second operand has 54 states, 53 states have (on average 4.830188679245283) internal successors, (256), 51 states have internal predecessors, (256), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:54,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:54,170 INFO L93 Difference]: Finished difference Result 17196 states and 18788 transitions. [2021-11-02 22:35:54,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-02 22:35:54,171 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 4.830188679245283) internal successors, (256), 51 states have internal predecessors, (256), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 172 [2021-11-02 22:35:54,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:54,184 INFO L225 Difference]: With dead ends: 17196 [2021-11-02 22:35:54,184 INFO L226 Difference]: Without dead ends: 17177 [2021-11-02 22:35:54,185 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2029 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=879, Invalid=4671, Unknown=0, NotChecked=0, Total=5550 [2021-11-02 22:35:54,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17177 states. [2021-11-02 22:35:54,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17177 to 12942. [2021-11-02 22:35:54,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12942 states, 12911 states have (on average 1.1141662148555496) internal successors, (14385), 12915 states have internal predecessors, (14385), 25 states have call successors, (25), 25 states have call predecessors, (25), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:54,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12942 states to 12942 states and 14411 transitions. [2021-11-02 22:35:54,331 INFO L78 Accepts]: Start accepts. Automaton has 12942 states and 14411 transitions. Word has length 172 [2021-11-02 22:35:54,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:54,332 INFO L470 AbstractCegarLoop]: Abstraction has 12942 states and 14411 transitions. [2021-11-02 22:35:54,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 4.830188679245283) internal successors, (256), 51 states have internal predecessors, (256), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:54,332 INFO L276 IsEmpty]: Start isEmpty. Operand 12942 states and 14411 transitions. [2021-11-02 22:35:54,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-11-02 22:35:54,341 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:54,341 INFO L513 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:54,395 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2021-11-02 22:35:54,556 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:54,556 INFO L402 AbstractCegarLoop]: === Iteration 77 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:35:54,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:54,556 INFO L85 PathProgramCache]: Analyzing trace with hash -1288272290, now seen corresponding path program 25 times [2021-11-02 22:35:54,557 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:54,557 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1475868973] [2021-11-02 22:35:54,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:54,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:54,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:57,113 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:57,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:57,116 INFO L134 CoverageAnalysis]: Checked inductivity of 776 backedges. 51 proven. 725 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:57,116 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:57,116 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1475868973] [2021-11-02 22:35:57,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1475868973] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:57,117 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1619194852] [2021-11-02 22:35:57,117 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:35:57,117 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:57,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:57,118 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:57,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-02 22:36:02,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:02,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 82 conjunts are in the unsatisfiable core [2021-11-02 22:36:02,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:03,312 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-02 22:36:04,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-02 22:36:04,862 INFO L134 CoverageAnalysis]: Checked inductivity of 776 backedges. 51 proven. 535 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-02 22:36:04,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1619194852] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:04,863 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:36:04,863 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 33] total 74 [2021-11-02 22:36:04,863 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861708756] [2021-11-02 22:36:04,863 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-02 22:36:04,863 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:04,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-02 22:36:04,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=5179, Unknown=0, NotChecked=0, Total=5402 [2021-11-02 22:36:04,864 INFO L87 Difference]: Start difference. First operand 12942 states and 14411 transitions. Second operand has 74 states, 72 states have (on average 4.055555555555555) internal successors, (292), 71 states have internal predecessors, (292), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:23,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:23,301 INFO L93 Difference]: Finished difference Result 18891 states and 20870 transitions. [2021-11-02 22:36:23,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-11-02 22:36:23,301 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 72 states have (on average 4.055555555555555) internal successors, (292), 71 states have internal predecessors, (292), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 176 [2021-11-02 22:36:23,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:23,315 INFO L225 Difference]: With dead ends: 18891 [2021-11-02 22:36:23,315 INFO L226 Difference]: Without dead ends: 18777 [2021-11-02 22:36:23,316 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 149 SyntacticMatches, 1 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5765 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=1036, Invalid=24404, Unknown=0, NotChecked=0, Total=25440 [2021-11-02 22:36:23,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18777 states. [2021-11-02 22:36:23,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18777 to 12946. [2021-11-02 22:36:23,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12946 states, 12915 states have (on average 1.1142082849399924) internal successors, (14390), 12919 states have internal predecessors, (14390), 25 states have call successors, (25), 25 states have call predecessors, (25), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:23,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12946 states to 12946 states and 14416 transitions. [2021-11-02 22:36:23,479 INFO L78 Accepts]: Start accepts. Automaton has 12946 states and 14416 transitions. Word has length 176 [2021-11-02 22:36:23,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:23,479 INFO L470 AbstractCegarLoop]: Abstraction has 12946 states and 14416 transitions. [2021-11-02 22:36:23,479 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 72 states have (on average 4.055555555555555) internal successors, (292), 71 states have internal predecessors, (292), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:23,480 INFO L276 IsEmpty]: Start isEmpty. Operand 12946 states and 14416 transitions. [2021-11-02 22:36:23,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-11-02 22:36:23,489 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:23,490 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:23,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:23,704 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:23,704 INFO L402 AbstractCegarLoop]: === Iteration 78 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:36:23,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:23,704 INFO L85 PathProgramCache]: Analyzing trace with hash 718718644, now seen corresponding path program 18 times [2021-11-02 22:36:23,705 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:23,705 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351664992] [2021-11-02 22:36:23,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:23,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:23,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:24,227 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:24,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:24,230 INFO L134 CoverageAnalysis]: Checked inductivity of 710 backedges. 120 proven. 575 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:36:24,230 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:24,230 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351664992] [2021-11-02 22:36:24,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [351664992] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:24,231 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [283728939] [2021-11-02 22:36:24,231 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:36:24,231 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:24,231 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:24,232 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:24,232 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-02 22:36:29,878 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2021-11-02 22:36:29,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:36:29,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 722 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-02 22:36:29,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:31,110 INFO L134 CoverageAnalysis]: Checked inductivity of 710 backedges. 153 proven. 542 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:36:31,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [283728939] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:31,111 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:36:31,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 27] total 52 [2021-11-02 22:36:31,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511607646] [2021-11-02 22:36:31,111 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-02 22:36:31,111 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:31,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-02 22:36:31,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=2392, Unknown=0, NotChecked=0, Total=2756 [2021-11-02 22:36:31,112 INFO L87 Difference]: Start difference. First operand 12946 states and 14416 transitions. Second operand has 53 states, 52 states have (on average 6.346153846153846) internal successors, (330), 50 states have internal predecessors, (330), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:34,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:34,214 INFO L93 Difference]: Finished difference Result 15046 states and 16717 transitions. [2021-11-02 22:36:34,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-02 22:36:34,214 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 6.346153846153846) internal successors, (330), 50 states have internal predecessors, (330), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 179 [2021-11-02 22:36:34,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:34,225 INFO L225 Difference]: With dead ends: 15046 [2021-11-02 22:36:34,226 INFO L226 Difference]: Without dead ends: 15046 [2021-11-02 22:36:34,226 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1430 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=734, Invalid=5118, Unknown=0, NotChecked=0, Total=5852 [2021-11-02 22:36:34,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15046 states. [2021-11-02 22:36:34,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15046 to 13816. [2021-11-02 22:36:34,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13816 states, 13785 states have (on average 1.115487849111353) internal successors, (15377), 13789 states have internal predecessors, (15377), 25 states have call successors, (25), 25 states have call predecessors, (25), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:34,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13816 states to 13816 states and 15403 transitions. [2021-11-02 22:36:34,363 INFO L78 Accepts]: Start accepts. Automaton has 13816 states and 15403 transitions. Word has length 179 [2021-11-02 22:36:34,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:34,364 INFO L470 AbstractCegarLoop]: Abstraction has 13816 states and 15403 transitions. [2021-11-02 22:36:34,364 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 52 states have (on average 6.346153846153846) internal successors, (330), 50 states have internal predecessors, (330), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:34,364 INFO L276 IsEmpty]: Start isEmpty. Operand 13816 states and 15403 transitions. [2021-11-02 22:36:34,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2021-11-02 22:36:34,370 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:34,371 INFO L513 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:34,414 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:34,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:34,571 INFO L402 AbstractCegarLoop]: === Iteration 79 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:36:34,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:34,572 INFO L85 PathProgramCache]: Analyzing trace with hash 335187771, now seen corresponding path program 26 times [2021-11-02 22:36:34,572 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:34,572 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097323957] [2021-11-02 22:36:34,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:34,572 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:34,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:35,327 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:35,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:35,331 INFO L134 CoverageAnalysis]: Checked inductivity of 817 backedges. 153 proven. 474 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-02 22:36:35,331 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:35,331 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097323957] [2021-11-02 22:36:35,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2097323957] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:35,331 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1954667007] [2021-11-02 22:36:35,331 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:36:35,331 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:35,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:35,336 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:35,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-02 22:36:40,493 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:36:40,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:36:40,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 675 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-02 22:36:40,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:40,525 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:36:40,526 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:36:42,352 INFO L134 CoverageAnalysis]: Checked inductivity of 817 backedges. 190 proven. 437 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-02 22:36:42,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1954667007] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:42,352 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:36:42,352 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 57 [2021-11-02 22:36:42,352 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215303496] [2021-11-02 22:36:42,353 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-02 22:36:42,353 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:42,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-02 22:36:42,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=332, Invalid=2974, Unknown=0, NotChecked=0, Total=3306 [2021-11-02 22:36:42,354 INFO L87 Difference]: Start difference. First operand 13816 states and 15403 transitions. Second operand has 58 states, 56 states have (on average 4.839285714285714) internal successors, (271), 55 states have internal predecessors, (271), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:45,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:45,945 INFO L93 Difference]: Finished difference Result 16435 states and 18192 transitions. [2021-11-02 22:36:45,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-02 22:36:45,948 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 56 states have (on average 4.839285714285714) internal successors, (271), 55 states have internal predecessors, (271), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 180 [2021-11-02 22:36:45,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:45,963 INFO L225 Difference]: With dead ends: 16435 [2021-11-02 22:36:45,963 INFO L226 Difference]: Without dead ends: 16433 [2021-11-02 22:36:45,963 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 153 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1732 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=505, Invalid=4751, Unknown=0, NotChecked=0, Total=5256 [2021-11-02 22:36:45,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16433 states. [2021-11-02 22:36:46,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16433 to 13963. [2021-11-02 22:36:46,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13963 states, 13932 states have (on average 1.1157766293425209) internal successors, (15545), 13936 states have internal predecessors, (15545), 25 states have call successors, (25), 25 states have call predecessors, (25), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:46,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13963 states to 13963 states and 15571 transitions. [2021-11-02 22:36:46,125 INFO L78 Accepts]: Start accepts. Automaton has 13963 states and 15571 transitions. Word has length 180 [2021-11-02 22:36:46,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:46,125 INFO L470 AbstractCegarLoop]: Abstraction has 13963 states and 15571 transitions. [2021-11-02 22:36:46,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 56 states have (on average 4.839285714285714) internal successors, (271), 55 states have internal predecessors, (271), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:46,126 INFO L276 IsEmpty]: Start isEmpty. Operand 13963 states and 15571 transitions. [2021-11-02 22:36:46,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2021-11-02 22:36:46,132 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:46,132 INFO L513 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:46,173 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:46,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2021-11-02 22:36:46,334 INFO L402 AbstractCegarLoop]: === Iteration 80 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-02 22:36:46,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:46,335 INFO L85 PathProgramCache]: Analyzing trace with hash -1763268698, now seen corresponding path program 19 times [2021-11-02 22:36:46,335 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:46,335 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255257242] [2021-11-02 22:36:46,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:46,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:46,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:47,100 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:47,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:47,102 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 101 proven. 705 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:36:47,103 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:47,103 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255257242] [2021-11-02 22:36:47,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255257242] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:47,103 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [475662996] [2021-11-02 22:36:47,103 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:36:47,103 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:47,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:47,104 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:47,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_98201263-cdd6-4e2a-abef-42d839bdf9fb/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-02 22:36:52,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:52,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 759 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-02 22:36:52,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:52,371 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:36:52,371 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:36:53,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-02 22:36:53,417 INFO L354 Elim1Store]: treesize reduction 44, result has 18.5 percent of original size [2021-11-02 22:36:53,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 37