./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 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/substring-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY --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-47ea020 [2021-11-07 08:19:30,117 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 08:19:30,119 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 08:19:30,160 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 08:19:30,160 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 08:19:30,162 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 08:19:30,164 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 08:19:30,167 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 08:19:30,169 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 08:19:30,170 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 08:19:30,172 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 08:19:30,173 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 08:19:30,174 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 08:19:30,176 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 08:19:30,178 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 08:19:30,180 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 08:19:30,181 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 08:19:30,183 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 08:19:30,185 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 08:19:30,188 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 08:19:30,191 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 08:19:30,193 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 08:19:30,195 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 08:19:30,196 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 08:19:30,200 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 08:19:30,201 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 08:19:30,202 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 08:19:30,203 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 08:19:30,204 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 08:19:30,205 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 08:19:30,206 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 08:19:30,207 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 08:19:30,208 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 08:19:30,210 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 08:19:30,211 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 08:19:30,212 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 08:19:30,213 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 08:19:30,214 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 08:19:30,214 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 08:19:30,216 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 08:19:30,217 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 08:19:30,218 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-11-07 08:19:30,244 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 08:19:30,244 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 08:19:30,245 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-07 08:19:30,246 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-07 08:19:30,247 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-07 08:19:30,248 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-07 08:19:30,248 INFO L138 SettingsManager]: * Use SBE=true [2021-11-07 08:19:30,249 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 08:19:30,249 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 08:19:30,250 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-07 08:19:30,250 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 08:19:30,250 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 08:19:30,251 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 08:19:30,251 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-07 08:19:30,252 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-07 08:19:30,252 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-07 08:19:30,253 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 08:19:30,253 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 08:19:30,254 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 08:19:30,254 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 08:19:30,255 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 08:19:30,255 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 08:19:30,256 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 08:19:30,256 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 08:19:30,257 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 08:19:30,257 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 08:19:30,258 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-07 08:19:30,258 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 08:19:30,259 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 08:19:30,259 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_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4cb6276eff0c60579b1d5f7034948eb4f53891709ff48cdd11b3329ec3c4cc2e [2021-11-07 08:19:30,499 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 08:19:30,529 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 08:19:30,532 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 08:19:30,534 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 08:19:30,536 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 08:19:30,537 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/../../sv-benchmarks/c/array-memsafety/substring-alloca-2.i [2021-11-07 08:19:30,612 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/data/fe43f695e/177542394c2c462687888746688eadcf/FLAG0e8feb648 [2021-11-07 08:19:31,141 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 08:19:31,142 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/sv-benchmarks/c/array-memsafety/substring-alloca-2.i [2021-11-07 08:19:31,167 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/data/fe43f695e/177542394c2c462687888746688eadcf/FLAG0e8feb648 [2021-11-07 08:19:31,447 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/data/fe43f695e/177542394c2c462687888746688eadcf [2021-11-07 08:19:31,449 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 08:19:31,451 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-07 08:19:31,452 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 08:19:31,452 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 08:19:31,456 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 08:19:31,464 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 08:19:31" (1/1) ... [2021-11-07 08:19:31,465 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@9f6f253 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:19:31, skipping insertion in model container [2021-11-07 08:19:31,465 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 08:19:31" (1/1) ... [2021-11-07 08:19:31,471 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 08:19:31,515 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 08:19:31,832 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 08:19:31,848 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 08:19:31,917 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 08:19:31,956 INFO L208 MainTranslator]: Completed translation [2021-11-07 08:19:31,957 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:19:31 WrapperNode [2021-11-07 08:19:31,957 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 08:19:31,959 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 08:19:31,959 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 08:19:31,959 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 08:19:31,971 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:19:31" (1/1) ... [2021-11-07 08:19:31,973 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:19:31" (1/1) ... [2021-11-07 08:19:32,012 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:19:31" (1/1) ... [2021-11-07 08:19:32,012 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:19:31" (1/1) ... [2021-11-07 08:19:32,039 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:19:31" (1/1) ... [2021-11-07 08:19:32,049 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:19:31" (1/1) ... [2021-11-07 08:19:32,055 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:19:31" (1/1) ... [2021-11-07 08:19:32,064 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 08:19:32,071 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 08:19:32,071 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 08:19:32,071 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 08:19:32,075 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:19:31" (1/1) ... [2021-11-07 08:19:32,086 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 08:19:32,098 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:19:32,120 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 08:19:32,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 08:19:32,175 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-07 08:19:32,176 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 08:19:32,177 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-07 08:19:32,177 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-07 08:19:32,177 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2021-11-07 08:19:32,177 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2021-11-07 08:19:32,177 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2021-11-07 08:19:32,178 INFO L138 BoogieDeclarations]: Found implementation of procedure substring [2021-11-07 08:19:32,178 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-07 08:19:32,179 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-07 08:19:32,179 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-07 08:19:32,180 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-07 08:19:32,180 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-07 08:19:32,180 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-07 08:19:32,180 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-07 08:19:32,181 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-07 08:19:32,181 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-07 08:19:32,181 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-07 08:19:32,181 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-07 08:19:32,181 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-07 08:19:32,181 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-07 08:19:32,182 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-07 08:19:32,182 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-07 08:19:32,182 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-07 08:19:32,182 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-07 08:19:32,182 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-07 08:19:32,183 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-07 08:19:32,183 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2021-11-07 08:19:32,183 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2021-11-07 08:19:32,183 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2021-11-07 08:19:32,183 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-07 08:19:32,184 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-07 08:19:32,184 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-07 08:19:32,184 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-07 08:19:32,184 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-07 08:19:32,185 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-07 08:19:32,185 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-07 08:19:32,185 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-07 08:19:32,185 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-07 08:19:32,185 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-07 08:19:32,185 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-07 08:19:32,186 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-07 08:19:32,186 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-07 08:19:32,186 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-07 08:19:32,186 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-07 08:19:32,186 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-07 08:19:32,187 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-07 08:19:32,187 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-07 08:19:32,187 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-07 08:19:32,187 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-07 08:19:32,188 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-07 08:19:32,188 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-07 08:19:32,188 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-07 08:19:32,189 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-07 08:19:32,189 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-07 08:19:32,189 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-07 08:19:32,190 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-07 08:19:32,190 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-07 08:19:32,190 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-07 08:19:32,190 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-07 08:19:32,191 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-07 08:19:32,191 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-07 08:19:32,191 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-07 08:19:32,191 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-07 08:19:32,191 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-07 08:19:32,192 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-07 08:19:32,192 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-07 08:19:32,192 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-07 08:19:32,193 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-07 08:19:32,194 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-07 08:19:32,194 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-07 08:19:32,195 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-11-07 08:19:32,195 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-07 08:19:32,195 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-07 08:19:32,195 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-11-07 08:19:32,195 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-07 08:19:32,196 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-07 08:19:32,196 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-11-07 08:19:32,196 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-07 08:19:32,196 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-07 08:19:32,196 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-07 08:19:32,196 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-07 08:19:32,197 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-07 08:19:32,197 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-07 08:19:32,198 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-07 08:19:32,198 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-07 08:19:32,198 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-07 08:19:32,198 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-07 08:19:32,198 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-07 08:19:32,199 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-07 08:19:32,199 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-07 08:19:32,199 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-07 08:19:32,199 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-07 08:19:32,199 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-07 08:19:32,199 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-07 08:19:32,200 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-07 08:19:32,200 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-07 08:19:32,200 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-07 08:19:32,200 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-07 08:19:32,200 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-07 08:19:32,200 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-07 08:19:32,201 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-07 08:19:32,201 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-07 08:19:32,201 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-07 08:19:32,201 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-07 08:19:32,201 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-07 08:19:32,201 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-07 08:19:32,202 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-07 08:19:32,202 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-07 08:19:32,202 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-07 08:19:32,202 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-07 08:19:32,203 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-07 08:19:32,203 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-07 08:19:32,203 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-07 08:19:32,204 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-07 08:19:32,204 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-07 08:19:32,204 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-11-07 08:19:32,204 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2021-11-07 08:19:32,204 INFO L130 BoogieDeclarations]: Found specification of procedure substring [2021-11-07 08:19:32,204 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-07 08:19:32,205 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-07 08:19:32,205 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 08:19:32,205 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-07 08:19:32,205 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-07 08:19:32,205 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-07 08:19:32,206 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 08:19:32,736 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 08:19:32,736 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-07 08:19:32,738 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 08:19:32 BoogieIcfgContainer [2021-11-07 08:19:32,739 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 08:19:32,741 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 08:19:32,741 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 08:19:32,747 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 08:19:32,748 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 08:19:31" (1/3) ... [2021-11-07 08:19:32,748 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d1650c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 08:19:32, skipping insertion in model container [2021-11-07 08:19:32,749 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:19:31" (2/3) ... [2021-11-07 08:19:32,749 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d1650c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 08:19:32, skipping insertion in model container [2021-11-07 08:19:32,749 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 08:19:32" (3/3) ... [2021-11-07 08:19:32,750 INFO L111 eAbstractionObserver]: Analyzing ICFG substring-alloca-2.i [2021-11-07 08:19:32,756 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 08:19:32,756 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 19 error locations. [2021-11-07 08:19:32,810 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 08:19:32,817 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 [2021-11-07 08:19:32,817 INFO L340 AbstractCegarLoop]: Starting to check reachability of 19 error locations. [2021-11-07 08:19:32,833 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) [2021-11-07 08:19:32,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-07 08:19:32,841 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:32,842 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:19:32,843 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:32,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:32,849 INFO L85 PathProgramCache]: Analyzing trace with hash -391744755, now seen corresponding path program 1 times [2021-11-07 08:19:32,858 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:32,859 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638859936] [2021-11-07 08:19:32,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:32,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:32,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:33,064 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:33,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:33,076 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:33,076 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:33,077 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638859936] [2021-11-07 08:19:33,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [638859936] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:33,078 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:33,078 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 08:19:33,080 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259873345] [2021-11-07 08:19:33,085 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 08:19:33,085 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:33,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 08:19:33,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-07 08:19:33,102 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) [2021-11-07 08:19:33,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:33,356 INFO L93 Difference]: Finished difference Result 81 states and 91 transitions. [2021-11-07 08:19:33,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 08:19:33,358 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 [2021-11-07 08:19:33,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:33,369 INFO L225 Difference]: With dead ends: 81 [2021-11-07 08:19:33,369 INFO L226 Difference]: Without dead ends: 77 [2021-11-07 08:19:33,370 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 [2021-11-07 08:19:33,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-07 08:19:33,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 60. [2021-11-07 08:19:33,410 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) [2021-11-07 08:19:33,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 68 transitions. [2021-11-07 08:19:33,413 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 68 transitions. Word has length 11 [2021-11-07 08:19:33,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:33,414 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 68 transitions. [2021-11-07 08:19:33,414 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) [2021-11-07 08:19:33,414 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 68 transitions. [2021-11-07 08:19:33,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-07 08:19:33,415 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:33,415 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:19:33,415 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 08:19:33,416 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:33,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:33,416 INFO L85 PathProgramCache]: Analyzing trace with hash -389897713, now seen corresponding path program 1 times [2021-11-07 08:19:33,417 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:33,417 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306032010] [2021-11-07 08:19:33,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:33,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:33,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:33,531 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:33,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:33,540 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:33,540 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:33,540 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306032010] [2021-11-07 08:19:33,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [306032010] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:33,541 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:33,541 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 08:19:33,541 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100271048] [2021-11-07 08:19:33,542 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 08:19:33,543 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:33,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 08:19:33,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 08:19:33,544 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) [2021-11-07 08:19:33,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:33,737 INFO L93 Difference]: Finished difference Result 82 states and 92 transitions. [2021-11-07 08:19:33,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 08:19:33,738 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 [2021-11-07 08:19:33,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:33,740 INFO L225 Difference]: With dead ends: 82 [2021-11-07 08:19:33,740 INFO L226 Difference]: Without dead ends: 82 [2021-11-07 08:19:33,741 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 [2021-11-07 08:19:33,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-07 08:19:33,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 62. [2021-11-07 08:19:33,758 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) [2021-11-07 08:19:33,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 72 transitions. [2021-11-07 08:19:33,765 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 72 transitions. Word has length 11 [2021-11-07 08:19:33,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:33,765 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 72 transitions. [2021-11-07 08:19:33,765 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) [2021-11-07 08:19:33,766 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 72 transitions. [2021-11-07 08:19:33,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-07 08:19:33,766 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:33,766 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:19:33,767 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 08:19:33,767 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:33,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:33,768 INFO L85 PathProgramCache]: Analyzing trace with hash -389897714, now seen corresponding path program 1 times [2021-11-07 08:19:33,768 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:33,768 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [443208738] [2021-11-07 08:19:33,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:33,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:33,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:33,840 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:33,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:33,848 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:33,848 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:33,848 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [443208738] [2021-11-07 08:19:33,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [443208738] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:33,849 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:33,849 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 08:19:33,849 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322045803] [2021-11-07 08:19:33,849 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 08:19:33,850 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:33,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 08:19:33,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 08:19:33,851 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) [2021-11-07 08:19:33,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:33,971 INFO L93 Difference]: Finished difference Result 60 states and 69 transitions. [2021-11-07 08:19:33,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 08:19:33,974 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 [2021-11-07 08:19:33,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:33,978 INFO L225 Difference]: With dead ends: 60 [2021-11-07 08:19:33,979 INFO L226 Difference]: Without dead ends: 60 [2021-11-07 08:19:33,980 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 [2021-11-07 08:19:33,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-07 08:19:33,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-11-07 08:19:33,990 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) [2021-11-07 08:19:33,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 69 transitions. [2021-11-07 08:19:34,000 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 69 transitions. Word has length 11 [2021-11-07 08:19:34,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:34,001 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 69 transitions. [2021-11-07 08:19:34,001 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) [2021-11-07 08:19:34,002 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 69 transitions. [2021-11-07 08:19:34,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-07 08:19:34,003 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:34,003 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:19:34,003 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 08:19:34,003 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:34,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:34,005 INFO L85 PathProgramCache]: Analyzing trace with hash 1490361092, now seen corresponding path program 1 times [2021-11-07 08:19:34,005 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:34,006 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267804728] [2021-11-07 08:19:34,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:34,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:34,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:34,133 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:34,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:34,147 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:34,148 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:34,149 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267804728] [2021-11-07 08:19:34,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1267804728] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:34,149 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:34,150 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 08:19:34,150 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896131906] [2021-11-07 08:19:34,151 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 08:19:34,152 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:34,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 08:19:34,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-07 08:19:34,154 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) [2021-11-07 08:19:34,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:34,311 INFO L93 Difference]: Finished difference Result 59 states and 68 transitions. [2021-11-07 08:19:34,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 08:19:34,311 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 [2021-11-07 08:19:34,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:34,314 INFO L225 Difference]: With dead ends: 59 [2021-11-07 08:19:34,315 INFO L226 Difference]: Without dead ends: 59 [2021-11-07 08:19:34,315 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 [2021-11-07 08:19:34,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-07 08:19:34,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-07 08:19:34,329 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) [2021-11-07 08:19:34,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 68 transitions. [2021-11-07 08:19:34,330 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 68 transitions. Word has length 13 [2021-11-07 08:19:34,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:34,330 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 68 transitions. [2021-11-07 08:19:34,330 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) [2021-11-07 08:19:34,330 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 68 transitions. [2021-11-07 08:19:34,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-07 08:19:34,331 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:34,331 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:19:34,331 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 08:19:34,331 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr2REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:34,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:34,332 INFO L85 PathProgramCache]: Analyzing trace with hash 1490361144, now seen corresponding path program 1 times [2021-11-07 08:19:34,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:34,332 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [969812056] [2021-11-07 08:19:34,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:34,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:34,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:34,379 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:34,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:34,384 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:34,384 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:34,385 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [969812056] [2021-11-07 08:19:34,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [969812056] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:34,385 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:34,385 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 08:19:34,385 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827924983] [2021-11-07 08:19:34,386 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 08:19:34,386 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:34,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 08:19:34,387 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-07 08:19:34,387 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) [2021-11-07 08:19:34,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:34,488 INFO L93 Difference]: Finished difference Result 79 states and 90 transitions. [2021-11-07 08:19:34,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 08:19:34,489 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 [2021-11-07 08:19:34,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:34,490 INFO L225 Difference]: With dead ends: 79 [2021-11-07 08:19:34,490 INFO L226 Difference]: Without dead ends: 79 [2021-11-07 08:19:34,490 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 [2021-11-07 08:19:34,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-07 08:19:34,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 70. [2021-11-07 08:19:34,494 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) [2021-11-07 08:19:34,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 82 transitions. [2021-11-07 08:19:34,496 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 82 transitions. Word has length 13 [2021-11-07 08:19:34,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:34,496 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 82 transitions. [2021-11-07 08:19:34,496 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) [2021-11-07 08:19:34,496 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 82 transitions. [2021-11-07 08:19:34,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-07 08:19:34,497 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:34,497 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:19:34,497 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-07 08:19:34,497 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr2REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:34,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:34,498 INFO L85 PathProgramCache]: Analyzing trace with hash 1547619446, now seen corresponding path program 1 times [2021-11-07 08:19:34,498 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:34,498 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1183234570] [2021-11-07 08:19:34,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:34,499 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:34,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:34,531 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:34,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:34,536 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:34,536 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:34,536 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1183234570] [2021-11-07 08:19:34,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1183234570] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:34,537 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:34,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 08:19:34,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565627340] [2021-11-07 08:19:34,537 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 08:19:34,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:34,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 08:19:34,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 08:19:34,538 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) [2021-11-07 08:19:34,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:34,624 INFO L93 Difference]: Finished difference Result 68 states and 80 transitions. [2021-11-07 08:19:34,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 08:19:34,625 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 [2021-11-07 08:19:34,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:34,625 INFO L225 Difference]: With dead ends: 68 [2021-11-07 08:19:34,626 INFO L226 Difference]: Without dead ends: 68 [2021-11-07 08:19:34,626 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 [2021-11-07 08:19:34,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-07 08:19:34,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-07 08:19:34,629 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) [2021-11-07 08:19:34,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 80 transitions. [2021-11-07 08:19:34,630 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 80 transitions. Word has length 13 [2021-11-07 08:19:34,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:34,630 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 80 transitions. [2021-11-07 08:19:34,631 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) [2021-11-07 08:19:34,631 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 80 transitions. [2021-11-07 08:19:34,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-07 08:19:34,631 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:34,632 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:19:34,632 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-07 08:19:34,632 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:34,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:34,632 INFO L85 PathProgramCache]: Analyzing trace with hash 1547619447, now seen corresponding path program 1 times [2021-11-07 08:19:34,633 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:34,633 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83874104] [2021-11-07 08:19:34,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:34,633 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:34,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:34,709 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:34,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:34,714 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:34,714 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:34,714 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83874104] [2021-11-07 08:19:34,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [83874104] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:34,715 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:34,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 08:19:34,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834901724] [2021-11-07 08:19:34,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 08:19:34,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:34,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 08:19:34,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-07 08:19:34,717 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) [2021-11-07 08:19:34,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:34,870 INFO L93 Difference]: Finished difference Result 79 states and 92 transitions. [2021-11-07 08:19:34,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 08:19:34,870 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 [2021-11-07 08:19:34,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:34,871 INFO L225 Difference]: With dead ends: 79 [2021-11-07 08:19:34,871 INFO L226 Difference]: Without dead ends: 79 [2021-11-07 08:19:34,872 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 [2021-11-07 08:19:34,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-07 08:19:34,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 70. [2021-11-07 08:19:34,875 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) [2021-11-07 08:19:34,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 83 transitions. [2021-11-07 08:19:34,876 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 83 transitions. Word has length 13 [2021-11-07 08:19:34,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:34,876 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 83 transitions. [2021-11-07 08:19:34,876 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) [2021-11-07 08:19:34,877 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 83 transitions. [2021-11-07 08:19:34,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-07 08:19:34,877 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:34,877 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:19:34,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-07 08:19:34,878 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:34,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:34,878 INFO L85 PathProgramCache]: Analyzing trace with hash -1043446404, now seen corresponding path program 1 times [2021-11-07 08:19:34,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:34,879 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [877470493] [2021-11-07 08:19:34,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:34,879 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:34,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:34,956 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:34,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:34,970 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:34,971 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:34,971 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [877470493] [2021-11-07 08:19:34,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [877470493] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:34,971 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:34,971 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 08:19:34,972 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893889524] [2021-11-07 08:19:34,972 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 08:19:34,972 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:34,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 08:19:34,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-07 08:19:34,973 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) [2021-11-07 08:19:35,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:35,064 INFO L93 Difference]: Finished difference Result 69 states and 82 transitions. [2021-11-07 08:19:35,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 08:19:35,065 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 [2021-11-07 08:19:35,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:35,066 INFO L225 Difference]: With dead ends: 69 [2021-11-07 08:19:35,066 INFO L226 Difference]: Without dead ends: 69 [2021-11-07 08:19:35,066 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 [2021-11-07 08:19:35,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-11-07 08:19:35,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-11-07 08:19:35,069 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) [2021-11-07 08:19:35,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 82 transitions. [2021-11-07 08:19:35,070 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 82 transitions. Word has length 14 [2021-11-07 08:19:35,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:35,070 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 82 transitions. [2021-11-07 08:19:35,070 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) [2021-11-07 08:19:35,071 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 82 transitions. [2021-11-07 08:19:35,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-07 08:19:35,071 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:35,071 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:19:35,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-07 08:19:35,072 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting mainErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:35,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:35,072 INFO L85 PathProgramCache]: Analyzing trace with hash -1553442094, now seen corresponding path program 1 times [2021-11-07 08:19:35,072 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:35,072 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [763954713] [2021-11-07 08:19:35,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:35,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:35,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:35,163 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:35,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:35,169 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:35,169 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:35,169 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [763954713] [2021-11-07 08:19:35,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [763954713] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:19:35,170 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [159223948] [2021-11-07 08:19:35,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:35,170 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:19:35,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:19:35,179 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:19:35,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-07 08:19:35,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:35,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-07 08:19:35,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:19:35,448 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-07 08:19:35,452 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 [2021-11-07 08:19:35,461 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 [2021-11-07 08:19:35,561 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:35,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [159223948] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:19:35,565 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:19:35,565 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-11-07 08:19:35,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704693046] [2021-11-07 08:19:35,566 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 08:19:35,567 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:35,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 08:19:35,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-07 08:19:35,567 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) [2021-11-07 08:19:35,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:35,743 INFO L93 Difference]: Finished difference Result 88 states and 102 transitions. [2021-11-07 08:19:35,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 08:19:35,744 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 [2021-11-07 08:19:35,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:35,745 INFO L225 Difference]: With dead ends: 88 [2021-11-07 08:19:35,745 INFO L226 Difference]: Without dead ends: 88 [2021-11-07 08:19:35,745 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 [2021-11-07 08:19:35,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-07 08:19:35,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 64. [2021-11-07 08:19:35,748 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) [2021-11-07 08:19:35,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 74 transitions. [2021-11-07 08:19:35,750 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 74 transitions. Word has length 15 [2021-11-07 08:19:35,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:35,751 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 74 transitions. [2021-11-07 08:19:35,751 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) [2021-11-07 08:19:35,751 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 74 transitions. [2021-11-07 08:19:35,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-07 08:19:35,756 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:35,756 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:19:35,794 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-07 08:19:35,970 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-07 08:19:35,971 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting substringErr0REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:35,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:35,971 INFO L85 PathProgramCache]: Analyzing trace with hash 1661532524, now seen corresponding path program 1 times [2021-11-07 08:19:35,971 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:35,971 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678347245] [2021-11-07 08:19:35,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:35,971 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:35,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:36,030 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:36,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:36,040 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:36,040 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:36,043 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678347245] [2021-11-07 08:19:36,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1678347245] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:36,043 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:36,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 08:19:36,044 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480473399] [2021-11-07 08:19:36,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 08:19:36,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:36,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 08:19:36,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-07 08:19:36,045 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) [2021-11-07 08:19:36,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:36,202 INFO L93 Difference]: Finished difference Result 63 states and 73 transitions. [2021-11-07 08:19:36,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 08:19:36,203 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 [2021-11-07 08:19:36,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:36,203 INFO L225 Difference]: With dead ends: 63 [2021-11-07 08:19:36,204 INFO L226 Difference]: Without dead ends: 63 [2021-11-07 08:19:36,204 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 [2021-11-07 08:19:36,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-07 08:19:36,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-11-07 08:19:36,206 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) [2021-11-07 08:19:36,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 73 transitions. [2021-11-07 08:19:36,207 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 73 transitions. Word has length 17 [2021-11-07 08:19:36,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:36,207 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 73 transitions. [2021-11-07 08:19:36,207 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) [2021-11-07 08:19:36,208 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 73 transitions. [2021-11-07 08:19:36,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-07 08:19:36,208 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:36,208 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:19:36,209 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-07 08:19:36,209 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:36,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:36,209 INFO L85 PathProgramCache]: Analyzing trace with hash 1661532525, now seen corresponding path program 1 times [2021-11-07 08:19:36,209 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:36,210 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1103821340] [2021-11-07 08:19:36,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:36,210 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:36,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:36,341 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:36,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:36,345 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:36,345 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:36,345 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1103821340] [2021-11-07 08:19:36,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1103821340] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:36,345 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:36,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-07 08:19:36,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507329690] [2021-11-07 08:19:36,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 08:19:36,346 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:36,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 08:19:36,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-07 08:19:36,347 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) [2021-11-07 08:19:36,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:36,595 INFO L93 Difference]: Finished difference Result 85 states and 99 transitions. [2021-11-07 08:19:36,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 08:19:36,596 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 [2021-11-07 08:19:36,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:36,598 INFO L225 Difference]: With dead ends: 85 [2021-11-07 08:19:36,598 INFO L226 Difference]: Without dead ends: 85 [2021-11-07 08:19:36,598 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 [2021-11-07 08:19:36,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-07 08:19:36,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 64. [2021-11-07 08:19:36,601 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) [2021-11-07 08:19:36,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 74 transitions. [2021-11-07 08:19:36,601 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 74 transitions. Word has length 17 [2021-11-07 08:19:36,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:36,602 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 74 transitions. [2021-11-07 08:19:36,602 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) [2021-11-07 08:19:36,602 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 74 transitions. [2021-11-07 08:19:36,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-07 08:19:36,603 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:36,603 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:19:36,603 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-07 08:19:36,603 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:36,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:36,604 INFO L85 PathProgramCache]: Analyzing trace with hash 1317111226, now seen corresponding path program 1 times [2021-11-07 08:19:36,604 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:36,604 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117720222] [2021-11-07 08:19:36,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:36,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:36,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:36,699 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:36,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:36,703 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:36,703 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:36,703 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117720222] [2021-11-07 08:19:36,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2117720222] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:19:36,704 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1252759074] [2021-11-07 08:19:36,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:36,704 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:19:36,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:19:36,707 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:19:36,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-07 08:19:36,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:36,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-07 08:19:36,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:19:36,872 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:19:36,873 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 [2021-11-07 08:19:36,985 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:36,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1252759074] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:19:36,986 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:19:36,986 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-11-07 08:19:36,986 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357534019] [2021-11-07 08:19:36,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 08:19:36,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:36,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 08:19:36,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-07 08:19:36,987 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) [2021-11-07 08:19:37,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:37,118 INFO L93 Difference]: Finished difference Result 71 states and 81 transitions. [2021-11-07 08:19:37,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 08:19:37,118 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 [2021-11-07 08:19:37,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:37,119 INFO L225 Difference]: With dead ends: 71 [2021-11-07 08:19:37,119 INFO L226 Difference]: Without dead ends: 71 [2021-11-07 08:19:37,120 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 [2021-11-07 08:19:37,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-07 08:19:37,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 61. [2021-11-07 08:19:37,123 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) [2021-11-07 08:19:37,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 70 transitions. [2021-11-07 08:19:37,124 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 70 transitions. Word has length 17 [2021-11-07 08:19:37,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:37,124 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 70 transitions. [2021-11-07 08:19:37,125 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) [2021-11-07 08:19:37,125 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 70 transitions. [2021-11-07 08:19:37,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-07 08:19:37,127 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:37,127 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:19:37,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-07 08:19:37,350 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-07 08:19:37,350 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting substringErr2REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:37,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:37,351 INFO L85 PathProgramCache]: Analyzing trace with hash -995076911, now seen corresponding path program 1 times [2021-11-07 08:19:37,351 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:37,351 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686686547] [2021-11-07 08:19:37,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:37,351 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:37,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:37,417 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:37,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:37,421 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:37,421 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:37,421 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686686547] [2021-11-07 08:19:37,421 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686686547] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:37,421 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:37,422 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-07 08:19:37,422 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465392163] [2021-11-07 08:19:37,422 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 08:19:37,422 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:37,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 08:19:37,422 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-07 08:19:37,423 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) [2021-11-07 08:19:37,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:37,554 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2021-11-07 08:19:37,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 08:19:37,554 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 [2021-11-07 08:19:37,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:37,555 INFO L225 Difference]: With dead ends: 62 [2021-11-07 08:19:37,555 INFO L226 Difference]: Without dead ends: 62 [2021-11-07 08:19:37,555 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 [2021-11-07 08:19:37,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-07 08:19:37,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 58. [2021-11-07 08:19:37,557 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) [2021-11-07 08:19:37,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 67 transitions. [2021-11-07 08:19:37,558 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 67 transitions. Word has length 19 [2021-11-07 08:19:37,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:37,558 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 67 transitions. [2021-11-07 08:19:37,559 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) [2021-11-07 08:19:37,559 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 67 transitions. [2021-11-07 08:19:37,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-07 08:19:37,559 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:37,559 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:19:37,560 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-07 08:19:37,560 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:37,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:37,560 INFO L85 PathProgramCache]: Analyzing trace with hash -995076910, now seen corresponding path program 1 times [2021-11-07 08:19:37,560 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:37,561 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136059360] [2021-11-07 08:19:37,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:37,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:37,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:37,651 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:37,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:37,658 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:37,658 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:37,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136059360] [2021-11-07 08:19:37,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136059360] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:37,659 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:37,659 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-07 08:19:37,659 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757937850] [2021-11-07 08:19:37,659 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 08:19:37,659 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:37,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 08:19:37,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-07 08:19:37,660 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) [2021-11-07 08:19:37,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:37,880 INFO L93 Difference]: Finished difference Result 75 states and 88 transitions. [2021-11-07 08:19:37,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 08:19:37,881 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 [2021-11-07 08:19:37,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:37,881 INFO L225 Difference]: With dead ends: 75 [2021-11-07 08:19:37,882 INFO L226 Difference]: Without dead ends: 75 [2021-11-07 08:19:37,882 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 [2021-11-07 08:19:37,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-07 08:19:37,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 66. [2021-11-07 08:19:37,884 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) [2021-11-07 08:19:37,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 79 transitions. [2021-11-07 08:19:37,885 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 79 transitions. Word has length 19 [2021-11-07 08:19:37,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:37,885 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 79 transitions. [2021-11-07 08:19:37,885 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) [2021-11-07 08:19:37,885 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 79 transitions. [2021-11-07 08:19:37,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-07 08:19:37,886 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:37,886 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] [2021-11-07 08:19:37,886 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-07 08:19:37,886 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:37,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:37,887 INFO L85 PathProgramCache]: Analyzing trace with hash -1744606647, now seen corresponding path program 1 times [2021-11-07 08:19:37,887 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:37,887 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [99812589] [2021-11-07 08:19:37,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:37,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:37,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:37,927 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:37,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:37,938 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:37,938 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:37,938 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [99812589] [2021-11-07 08:19:37,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [99812589] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:37,938 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:37,939 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 08:19:37,939 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161902196] [2021-11-07 08:19:37,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 08:19:37,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:37,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 08:19:37,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 08:19:37,941 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) [2021-11-07 08:19:38,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:38,008 INFO L93 Difference]: Finished difference Result 68 states and 81 transitions. [2021-11-07 08:19:38,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 08:19:38,008 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 [2021-11-07 08:19:38,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:38,009 INFO L225 Difference]: With dead ends: 68 [2021-11-07 08:19:38,009 INFO L226 Difference]: Without dead ends: 68 [2021-11-07 08:19:38,011 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 [2021-11-07 08:19:38,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-07 08:19:38,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-07 08:19:38,013 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) [2021-11-07 08:19:38,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 81 transitions. [2021-11-07 08:19:38,013 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 81 transitions. Word has length 23 [2021-11-07 08:19:38,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:38,014 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 81 transitions. [2021-11-07 08:19:38,014 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) [2021-11-07 08:19:38,014 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 81 transitions. [2021-11-07 08:19:38,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-07 08:19:38,015 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:38,015 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] [2021-11-07 08:19:38,015 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-07 08:19:38,015 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting substringErr6REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:38,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:38,016 INFO L85 PathProgramCache]: Analyzing trace with hash -1744615721, now seen corresponding path program 1 times [2021-11-07 08:19:38,016 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:38,016 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803975157] [2021-11-07 08:19:38,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:38,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:38,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:38,079 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:38,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:38,086 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:38,086 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:38,086 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803975157] [2021-11-07 08:19:38,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803975157] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:38,087 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:38,087 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-07 08:19:38,087 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464126161] [2021-11-07 08:19:38,087 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 08:19:38,087 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:38,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 08:19:38,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-07 08:19:38,090 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) [2021-11-07 08:19:38,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:38,230 INFO L93 Difference]: Finished difference Result 71 states and 84 transitions. [2021-11-07 08:19:38,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 08:19:38,231 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 [2021-11-07 08:19:38,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:38,232 INFO L225 Difference]: With dead ends: 71 [2021-11-07 08:19:38,233 INFO L226 Difference]: Without dead ends: 71 [2021-11-07 08:19:38,233 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 [2021-11-07 08:19:38,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-07 08:19:38,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 67. [2021-11-07 08:19:38,236 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) [2021-11-07 08:19:38,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 79 transitions. [2021-11-07 08:19:38,237 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 79 transitions. Word has length 23 [2021-11-07 08:19:38,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:38,238 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 79 transitions. [2021-11-07 08:19:38,238 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) [2021-11-07 08:19:38,238 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 79 transitions. [2021-11-07 08:19:38,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-07 08:19:38,241 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:38,241 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] [2021-11-07 08:19:38,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-07 08:19:38,241 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:38,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:38,242 INFO L85 PathProgramCache]: Analyzing trace with hash -1744615720, now seen corresponding path program 1 times [2021-11-07 08:19:38,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:38,242 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629026168] [2021-11-07 08:19:38,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:38,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:38,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:38,321 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:38,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:38,325 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:38,325 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:38,325 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629026168] [2021-11-07 08:19:38,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1629026168] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:38,325 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:38,326 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-07 08:19:38,326 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647853481] [2021-11-07 08:19:38,326 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 08:19:38,326 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:38,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 08:19:38,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-07 08:19:38,327 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) [2021-11-07 08:19:38,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:38,585 INFO L93 Difference]: Finished difference Result 103 states and 123 transitions. [2021-11-07 08:19:38,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 08:19:38,586 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 [2021-11-07 08:19:38,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:38,587 INFO L225 Difference]: With dead ends: 103 [2021-11-07 08:19:38,587 INFO L226 Difference]: Without dead ends: 103 [2021-11-07 08:19:38,587 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2021-11-07 08:19:38,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-07 08:19:38,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 73. [2021-11-07 08:19:38,590 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) [2021-11-07 08:19:38,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2021-11-07 08:19:38,591 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 23 [2021-11-07 08:19:38,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:38,591 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2021-11-07 08:19:38,591 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) [2021-11-07 08:19:38,591 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2021-11-07 08:19:38,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-07 08:19:38,592 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:38,592 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:19:38,592 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-07 08:19:38,592 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting mainErr8ENSURES_VIOLATIONMEMORY_LEAK === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:38,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:38,599 INFO L85 PathProgramCache]: Analyzing trace with hash -1768533058, now seen corresponding path program 1 times [2021-11-07 08:19:38,600 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:38,600 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [885488595] [2021-11-07 08:19:38,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:38,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:38,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:38,656 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:38,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:38,660 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-11-07 08:19:38,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:38,668 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:38,668 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:38,669 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [885488595] [2021-11-07 08:19:38,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [885488595] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:38,669 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:38,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 08:19:38,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143929785] [2021-11-07 08:19:38,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 08:19:38,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:38,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 08:19:38,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-07 08:19:38,671 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) [2021-11-07 08:19:38,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:38,737 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2021-11-07 08:19:38,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 08:19:38,738 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 [2021-11-07 08:19:38,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:38,739 INFO L225 Difference]: With dead ends: 72 [2021-11-07 08:19:38,739 INFO L226 Difference]: Without dead ends: 67 [2021-11-07 08:19:38,739 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 [2021-11-07 08:19:38,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-07 08:19:38,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-11-07 08:19:38,741 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) [2021-11-07 08:19:38,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 79 transitions. [2021-11-07 08:19:38,742 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 79 transitions. Word has length 23 [2021-11-07 08:19:38,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:38,743 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 79 transitions. [2021-11-07 08:19:38,743 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) [2021-11-07 08:19:38,743 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 79 transitions. [2021-11-07 08:19:38,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-07 08:19:38,744 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:38,744 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] [2021-11-07 08:19:38,744 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-07 08:19:38,744 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:38,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:38,745 INFO L85 PathProgramCache]: Analyzing trace with hash -1529776103, now seen corresponding path program 1 times [2021-11-07 08:19:38,745 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:38,745 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [606844024] [2021-11-07 08:19:38,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:38,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:38,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:38,796 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:38,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:38,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:38,800 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:38,801 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [606844024] [2021-11-07 08:19:38,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [606844024] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:38,801 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:38,801 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-07 08:19:38,801 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991207295] [2021-11-07 08:19:38,802 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 08:19:38,802 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:38,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 08:19:38,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-07 08:19:38,803 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) [2021-11-07 08:19:38,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:38,946 INFO L93 Difference]: Finished difference Result 71 states and 82 transitions. [2021-11-07 08:19:38,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 08:19:38,946 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 [2021-11-07 08:19:38,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:38,947 INFO L225 Difference]: With dead ends: 71 [2021-11-07 08:19:38,947 INFO L226 Difference]: Without dead ends: 68 [2021-11-07 08:19:38,947 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 [2021-11-07 08:19:38,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-07 08:19:38,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2021-11-07 08:19:38,948 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) [2021-11-07 08:19:38,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 77 transitions. [2021-11-07 08:19:38,949 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 77 transitions. Word has length 25 [2021-11-07 08:19:38,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:38,949 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 77 transitions. [2021-11-07 08:19:38,949 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) [2021-11-07 08:19:38,949 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 77 transitions. [2021-11-07 08:19:38,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-07 08:19:38,950 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:38,950 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] [2021-11-07 08:19:38,950 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-07 08:19:38,950 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:38,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:38,950 INFO L85 PathProgramCache]: Analyzing trace with hash -447626662, now seen corresponding path program 1 times [2021-11-07 08:19:38,951 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:38,951 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [403978055] [2021-11-07 08:19:38,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:38,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:38,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:39,113 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:39,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:39,127 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:19:39,127 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:39,128 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [403978055] [2021-11-07 08:19:39,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [403978055] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:39,128 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:39,128 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-07 08:19:39,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989238683] [2021-11-07 08:19:39,129 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 08:19:39,129 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:39,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 08:19:39,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-07 08:19:39,130 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) [2021-11-07 08:19:39,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:39,334 INFO L93 Difference]: Finished difference Result 80 states and 90 transitions. [2021-11-07 08:19:39,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 08:19:39,335 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 [2021-11-07 08:19:39,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:39,335 INFO L225 Difference]: With dead ends: 80 [2021-11-07 08:19:39,336 INFO L226 Difference]: Without dead ends: 62 [2021-11-07 08:19:39,336 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 [2021-11-07 08:19:39,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-07 08:19:39,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-11-07 08:19:39,349 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) [2021-11-07 08:19:39,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 70 transitions. [2021-11-07 08:19:39,349 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 70 transitions. Word has length 26 [2021-11-07 08:19:39,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:39,350 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 70 transitions. [2021-11-07 08:19:39,350 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) [2021-11-07 08:19:39,350 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 70 transitions. [2021-11-07 08:19:39,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-07 08:19:39,350 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:39,350 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] [2021-11-07 08:19:39,351 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-07 08:19:39,351 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:39,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:39,351 INFO L85 PathProgramCache]: Analyzing trace with hash -1265275112, now seen corresponding path program 1 times [2021-11-07 08:19:39,351 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:39,351 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416935654] [2021-11-07 08:19:39,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:39,352 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:39,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:39,511 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:39,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:39,515 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:19:39,515 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:39,516 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416935654] [2021-11-07 08:19:39,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [416935654] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:39,516 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:39,516 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-07 08:19:39,516 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971321820] [2021-11-07 08:19:39,517 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 08:19:39,517 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:39,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 08:19:39,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-07 08:19:39,518 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) [2021-11-07 08:19:39,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:39,724 INFO L93 Difference]: Finished difference Result 83 states and 93 transitions. [2021-11-07 08:19:39,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-07 08:19:39,725 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 [2021-11-07 08:19:39,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:39,726 INFO L225 Difference]: With dead ends: 83 [2021-11-07 08:19:39,726 INFO L226 Difference]: Without dead ends: 70 [2021-11-07 08:19:39,726 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 [2021-11-07 08:19:39,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-07 08:19:39,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 64. [2021-11-07 08:19:39,728 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) [2021-11-07 08:19:39,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2021-11-07 08:19:39,729 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 26 [2021-11-07 08:19:39,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:39,729 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2021-11-07 08:19:39,729 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) [2021-11-07 08:19:39,729 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2021-11-07 08:19:39,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-07 08:19:39,730 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:39,730 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] [2021-11-07 08:19:39,730 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-07 08:19:39,730 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:39,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:39,731 INFO L85 PathProgramCache]: Analyzing trace with hash 1692710901, now seen corresponding path program 1 times [2021-11-07 08:19:39,731 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:39,731 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [819399631] [2021-11-07 08:19:39,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:39,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:39,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:39,869 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:39,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:39,872 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:19:39,873 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:39,873 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [819399631] [2021-11-07 08:19:39,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [819399631] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:39,873 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:39,873 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-07 08:19:39,874 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790853544] [2021-11-07 08:19:39,875 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-07 08:19:39,875 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:39,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-07 08:19:39,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-11-07 08:19:39,876 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) [2021-11-07 08:19:40,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:40,173 INFO L93 Difference]: Finished difference Result 73 states and 80 transitions. [2021-11-07 08:19:40,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-07 08:19:40,173 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 [2021-11-07 08:19:40,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:40,174 INFO L225 Difference]: With dead ends: 73 [2021-11-07 08:19:40,174 INFO L226 Difference]: Without dead ends: 56 [2021-11-07 08:19:40,175 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 [2021-11-07 08:19:40,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-07 08:19:40,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-11-07 08:19:40,177 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) [2021-11-07 08:19:40,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 62 transitions. [2021-11-07 08:19:40,177 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 62 transitions. Word has length 30 [2021-11-07 08:19:40,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:40,177 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 62 transitions. [2021-11-07 08:19:40,178 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) [2021-11-07 08:19:40,178 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 62 transitions. [2021-11-07 08:19:40,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-07 08:19:40,178 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:40,178 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] [2021-11-07 08:19:40,179 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-07 08:19:40,179 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:40,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:40,179 INFO L85 PathProgramCache]: Analyzing trace with hash -112727433, now seen corresponding path program 1 times [2021-11-07 08:19:40,179 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:40,180 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426350678] [2021-11-07 08:19:40,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:40,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:40,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:40,359 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:40,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:40,363 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:19:40,364 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:40,364 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426350678] [2021-11-07 08:19:40,364 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [426350678] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:19:40,364 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:19:40,365 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-11-07 08:19:40,365 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125587778] [2021-11-07 08:19:40,365 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-07 08:19:40,365 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:40,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-07 08:19:40,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-11-07 08:19:40,366 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) [2021-11-07 08:19:40,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:40,634 INFO L93 Difference]: Finished difference Result 69 states and 75 transitions. [2021-11-07 08:19:40,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-07 08:19:40,634 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 [2021-11-07 08:19:40,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:40,635 INFO L225 Difference]: With dead ends: 69 [2021-11-07 08:19:40,635 INFO L226 Difference]: Without dead ends: 60 [2021-11-07 08:19:40,636 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2021-11-07 08:19:40,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-07 08:19:40,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 57. [2021-11-07 08:19:40,638 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) [2021-11-07 08:19:40,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 63 transitions. [2021-11-07 08:19:40,638 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 63 transitions. Word has length 30 [2021-11-07 08:19:40,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:40,639 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 63 transitions. [2021-11-07 08:19:40,639 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) [2021-11-07 08:19:40,639 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 63 transitions. [2021-11-07 08:19:40,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-07 08:19:40,640 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:40,640 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] [2021-11-07 08:19:40,640 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-07 08:19:40,640 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:40,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:40,641 INFO L85 PathProgramCache]: Analyzing trace with hash -147074924, now seen corresponding path program 1 times [2021-11-07 08:19:40,641 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:40,641 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272167766] [2021-11-07 08:19:40,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:40,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:40,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:40,793 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:40,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:40,797 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:19:40,797 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:40,798 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272167766] [2021-11-07 08:19:40,798 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [272167766] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:19:40,798 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1347641235] [2021-11-07 08:19:40,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:40,798 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:19:40,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:19:40,799 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:19:40,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-07 08:19:40,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:40,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-07 08:19:40,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:19:41,210 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:19:41,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1347641235] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:19:41,210 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:19:41,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 18 [2021-11-07 08:19:41,210 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973418623] [2021-11-07 08:19:41,211 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-07 08:19:41,211 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:41,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-07 08:19:41,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2021-11-07 08:19:41,212 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) [2021-11-07 08:19:41,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:41,539 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2021-11-07 08:19:41,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-07 08:19:41,540 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 [2021-11-07 08:19:41,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:41,541 INFO L225 Difference]: With dead ends: 80 [2021-11-07 08:19:41,541 INFO L226 Difference]: Without dead ends: 78 [2021-11-07 08:19:41,541 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2021-11-07 08:19:41,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-07 08:19:41,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 64. [2021-11-07 08:19:41,544 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) [2021-11-07 08:19:41,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2021-11-07 08:19:41,545 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 34 [2021-11-07 08:19:41,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:41,545 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2021-11-07 08:19:41,545 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) [2021-11-07 08:19:41,545 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2021-11-07 08:19:41,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-07 08:19:41,546 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:41,546 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] [2021-11-07 08:19:41,582 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-07 08:19:41,758 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-07 08:19:41,758 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:41,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:41,759 INFO L85 PathProgramCache]: Analyzing trace with hash 394885028, now seen corresponding path program 1 times [2021-11-07 08:19:41,759 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:41,759 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361205993] [2021-11-07 08:19:41,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:41,759 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:41,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:41,891 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:41,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:41,897 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:19:41,897 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:41,898 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361205993] [2021-11-07 08:19:41,900 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [361205993] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:19:41,900 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [386808908] [2021-11-07 08:19:41,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:41,901 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:19:41,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:19:41,902 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:19:41,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-07 08:19:42,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:42,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-07 08:19:42,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:19:42,120 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:19:42,120 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 [2021-11-07 08:19:42,709 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:42,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [386808908] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:19:42,709 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:19:42,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 17 [2021-11-07 08:19:42,710 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651073171] [2021-11-07 08:19:42,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 08:19:42,710 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:42,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 08:19:42,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2021-11-07 08:19:42,711 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) [2021-11-07 08:19:43,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:43,254 INFO L93 Difference]: Finished difference Result 124 states and 143 transitions. [2021-11-07 08:19:43,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-07 08:19:43,254 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 [2021-11-07 08:19:43,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:43,255 INFO L225 Difference]: With dead ends: 124 [2021-11-07 08:19:43,255 INFO L226 Difference]: Without dead ends: 124 [2021-11-07 08:19:43,256 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=99, Invalid=551, Unknown=0, NotChecked=0, Total=650 [2021-11-07 08:19:43,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-07 08:19:43,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 84. [2021-11-07 08:19:43,259 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) [2021-11-07 08:19:43,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 101 transitions. [2021-11-07 08:19:43,259 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 101 transitions. Word has length 36 [2021-11-07 08:19:43,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:43,259 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 101 transitions. [2021-11-07 08:19:43,260 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) [2021-11-07 08:19:43,260 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 101 transitions. [2021-11-07 08:19:43,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-07 08:19:43,260 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:43,260 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] [2021-11-07 08:19:43,297 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-07 08:19:43,460 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-07 08:19:43,461 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:43,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:43,461 INFO L85 PathProgramCache]: Analyzing trace with hash 1560744346, now seen corresponding path program 1 times [2021-11-07 08:19:43,461 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:43,461 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682049972] [2021-11-07 08:19:43,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:43,461 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:43,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:43,602 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:43,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:43,611 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:19:43,611 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:43,612 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682049972] [2021-11-07 08:19:43,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [682049972] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:19:43,612 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1992432545] [2021-11-07 08:19:43,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:43,612 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:19:43,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:19:43,613 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:19:43,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-07 08:19:43,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:43,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-07 08:19:43,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:19:43,949 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-07 08:19:43,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-11-07 08:19:43,956 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 [2021-11-07 08:19:44,266 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:19:44,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1992432545] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:19:44,267 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:19:44,267 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 16 [2021-11-07 08:19:44,267 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957461106] [2021-11-07 08:19:44,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-07 08:19:44,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:44,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-07 08:19:44,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=234, Unknown=0, NotChecked=0, Total=272 [2021-11-07 08:19:44,268 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) [2021-11-07 08:19:44,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:44,686 INFO L93 Difference]: Finished difference Result 100 states and 112 transitions. [2021-11-07 08:19:44,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-07 08:19:44,686 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 [2021-11-07 08:19:44,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:44,687 INFO L225 Difference]: With dead ends: 100 [2021-11-07 08:19:44,687 INFO L226 Difference]: Without dead ends: 100 [2021-11-07 08:19:44,688 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=111, Invalid=539, Unknown=0, NotChecked=0, Total=650 [2021-11-07 08:19:44,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-07 08:19:44,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 84. [2021-11-07 08:19:44,704 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) [2021-11-07 08:19:44,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 100 transitions. [2021-11-07 08:19:44,705 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 100 transitions. Word has length 38 [2021-11-07 08:19:44,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:44,705 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 100 transitions. [2021-11-07 08:19:44,706 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) [2021-11-07 08:19:44,706 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 100 transitions. [2021-11-07 08:19:44,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-07 08:19:44,706 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:44,706 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] [2021-11-07 08:19:44,734 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-07 08:19:44,918 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:19:44,919 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:44,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:44,919 INFO L85 PathProgramCache]: Analyzing trace with hash -1181095848, now seen corresponding path program 2 times [2021-11-07 08:19:44,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:44,919 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834504200] [2021-11-07 08:19:44,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:44,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:44,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:45,146 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:45,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:45,149 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:19:45,149 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:45,150 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834504200] [2021-11-07 08:19:45,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1834504200] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:19:45,150 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1943474921] [2021-11-07 08:19:45,150 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 08:19:45,150 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:19:45,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:19:45,151 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:19:45,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-07 08:19:45,394 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 08:19:45,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:19:45,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-07 08:19:45,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:19:45,495 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 [2021-11-07 08:19:46,217 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 08:19:46,217 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 [2021-11-07 08:19:46,470 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:19:46,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1943474921] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:19:46,471 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:19:46,471 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 27 [2021-11-07 08:19:46,471 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976822596] [2021-11-07 08:19:46,472 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-07 08:19:46,472 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:46,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-07 08:19:46,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=635, Unknown=0, NotChecked=0, Total=702 [2021-11-07 08:19:46,473 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) [2021-11-07 08:19:52,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:52,922 INFO L93 Difference]: Finished difference Result 208 states and 233 transitions. [2021-11-07 08:19:52,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-07 08:19:52,923 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 [2021-11-07 08:19:52,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:52,925 INFO L225 Difference]: With dead ends: 208 [2021-11-07 08:19:52,925 INFO L226 Difference]: Without dead ends: 200 [2021-11-07 08:19:52,927 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 633 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=345, Invalid=2517, Unknown=0, NotChecked=0, Total=2862 [2021-11-07 08:19:52,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-11-07 08:19:52,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 149. [2021-11-07 08:19:52,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 139 states have (on average 1.2374100719424461) internal successors, (172), 143 states have internal predecessors, (172), 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) [2021-11-07 08:19:52,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 177 transitions. [2021-11-07 08:19:52,933 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 177 transitions. Word has length 41 [2021-11-07 08:19:52,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:52,934 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 177 transitions. [2021-11-07 08:19:52,934 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) [2021-11-07 08:19:52,941 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 177 transitions. [2021-11-07 08:19:52,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-07 08:19:52,941 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:52,941 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] [2021-11-07 08:19:52,982 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-07 08:19:53,162 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:19:53,162 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:53,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:53,163 INFO L85 PathProgramCache]: Analyzing trace with hash -1692139569, now seen corresponding path program 1 times [2021-11-07 08:19:53,163 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:53,163 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689554707] [2021-11-07 08:19:53,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:53,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:53,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:53,313 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:53,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:53,316 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:19:53,317 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:53,317 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689554707] [2021-11-07 08:19:53,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [689554707] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:19:53,317 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [290056267] [2021-11-07 08:19:53,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:53,317 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:19:53,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:19:53,318 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:19:53,334 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-07 08:19:53,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:53,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-07 08:19:53,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:19:53,595 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-07 08:19:53,595 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 [2021-11-07 08:19:53,599 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 [2021-11-07 08:19:53,975 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:19:53,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [290056267] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:19:53,976 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:19:53,976 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 16 [2021-11-07 08:19:53,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644274632] [2021-11-07 08:19:53,978 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-07 08:19:53,978 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:53,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-07 08:19:53,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=234, Unknown=0, NotChecked=0, Total=272 [2021-11-07 08:19:53,980 INFO L87 Difference]: Start difference. First operand 149 states and 177 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) [2021-11-07 08:19:54,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:54,469 INFO L93 Difference]: Finished difference Result 234 states and 270 transitions. [2021-11-07 08:19:54,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-07 08:19:54,470 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 [2021-11-07 08:19:54,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:54,472 INFO L225 Difference]: With dead ends: 234 [2021-11-07 08:19:54,472 INFO L226 Difference]: Without dead ends: 234 [2021-11-07 08:19:54,472 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=99, Invalid=501, Unknown=0, NotChecked=0, Total=600 [2021-11-07 08:19:54,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2021-11-07 08:19:54,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 167. [2021-11-07 08:19:54,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 157 states have (on average 1.2101910828025477) internal successors, (190), 161 states have internal predecessors, (190), 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) [2021-11-07 08:19:54,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 195 transitions. [2021-11-07 08:19:54,482 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 195 transitions. Word has length 42 [2021-11-07 08:19:54,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:54,482 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 195 transitions. [2021-11-07 08:19:54,482 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) [2021-11-07 08:19:54,482 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 195 transitions. [2021-11-07 08:19:54,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-07 08:19:54,483 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:54,483 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] [2021-11-07 08:19:54,516 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-07 08:19:54,683 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-07 08:19:54,684 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:54,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:54,684 INFO L85 PathProgramCache]: Analyzing trace with hash 1777949011, now seen corresponding path program 2 times [2021-11-07 08:19:54,684 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:54,684 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [632888201] [2021-11-07 08:19:54,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:54,684 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:54,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:55,000 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:55,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:55,004 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:19:55,005 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:55,005 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [632888201] [2021-11-07 08:19:55,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [632888201] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:19:55,005 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1601981269] [2021-11-07 08:19:55,005 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 08:19:55,005 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:19:55,006 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:19:55,007 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:19:55,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-07 08:19:55,331 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 08:19:55,331 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:19:55,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-07 08:19:55,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:19:55,374 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 [2021-11-07 08:19:55,639 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 [2021-11-07 08:19:55,722 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-07 08:19:55,723 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 [2021-11-07 08:19:56,786 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-07 08:19:56,787 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 [2021-11-07 08:19:56,841 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:19:56,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1601981269] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:19:56,842 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:19:56,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 23 [2021-11-07 08:19:56,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852067141] [2021-11-07 08:19:56,843 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-07 08:19:56,843 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:56,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-07 08:19:56,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=448, Unknown=0, NotChecked=0, Total=506 [2021-11-07 08:19:56,852 INFO L87 Difference]: Start difference. First operand 167 states and 195 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) [2021-11-07 08:19:57,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:19:57,689 INFO L93 Difference]: Finished difference Result 249 states and 283 transitions. [2021-11-07 08:19:57,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 08:19:57,691 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 [2021-11-07 08:19:57,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:19:57,693 INFO L225 Difference]: With dead ends: 249 [2021-11-07 08:19:57,693 INFO L226 Difference]: Without dead ends: 225 [2021-11-07 08:19:57,694 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=125, Invalid=805, Unknown=0, NotChecked=0, Total=930 [2021-11-07 08:19:57,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2021-11-07 08:19:57,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 215. [2021-11-07 08:19:57,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 204 states have (on average 1.2009803921568627) internal successors, (245), 208 states have internal predecessors, (245), 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) [2021-11-07 08:19:57,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 251 transitions. [2021-11-07 08:19:57,701 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 251 transitions. Word has length 47 [2021-11-07 08:19:57,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:19:57,701 INFO L470 AbstractCegarLoop]: Abstraction has 215 states and 251 transitions. [2021-11-07 08:19:57,702 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) [2021-11-07 08:19:57,702 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 251 transitions. [2021-11-07 08:19:57,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-07 08:19:57,703 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:19:57,703 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] [2021-11-07 08:19:57,771 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-07 08:19:57,928 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-07 08:19:57,929 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:19:57,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:19:57,929 INFO L85 PathProgramCache]: Analyzing trace with hash -1479203935, now seen corresponding path program 2 times [2021-11-07 08:19:57,929 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:19:57,929 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1606784572] [2021-11-07 08:19:57,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:19:57,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:19:57,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:58,518 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:19:58,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:19:58,531 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:19:58,532 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:19:58,532 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1606784572] [2021-11-07 08:19:58,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1606784572] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:19:58,532 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1509910090] [2021-11-07 08:19:58,532 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 08:19:58,533 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:19:58,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:19:58,540 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:19:58,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-07 08:19:58,837 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 08:19:58,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:19:58,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-07 08:19:58,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:19:58,875 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:19:58,875 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 [2021-11-07 08:19:59,173 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 [2021-11-07 08:19:59,581 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-11-07 08:19:59,582 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 [2021-11-07 08:19:59,597 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:19:59,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1509910090] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:19:59,597 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:19:59,597 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 16] total 33 [2021-11-07 08:19:59,598 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798786627] [2021-11-07 08:19:59,598 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-07 08:19:59,598 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:19:59,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-07 08:19:59,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=969, Unknown=0, NotChecked=0, Total=1056 [2021-11-07 08:19:59,600 INFO L87 Difference]: Start difference. First operand 215 states and 251 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) [2021-11-07 08:20:01,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:20:01,864 INFO L93 Difference]: Finished difference Result 320 states and 359 transitions. [2021-11-07 08:20:01,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-07 08:20:01,864 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 [2021-11-07 08:20:01,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:20:01,866 INFO L225 Difference]: With dead ends: 320 [2021-11-07 08:20:01,866 INFO L226 Difference]: Without dead ends: 291 [2021-11-07 08:20:01,868 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 813 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=435, Invalid=3471, Unknown=0, NotChecked=0, Total=3906 [2021-11-07 08:20:01,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2021-11-07 08:20:01,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 270. [2021-11-07 08:20:01,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 258 states have (on average 1.182170542635659) internal successors, (305), 262 states have internal predecessors, (305), 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) [2021-11-07 08:20:01,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 312 transitions. [2021-11-07 08:20:01,877 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 312 transitions. Word has length 49 [2021-11-07 08:20:01,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:20:01,877 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 312 transitions. [2021-11-07 08:20:01,878 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) [2021-11-07 08:20:01,878 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 312 transitions. [2021-11-07 08:20:01,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-07 08:20:01,879 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:20:01,879 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] [2021-11-07 08:20:01,923 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-07 08:20:02,094 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:20:02,094 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:20:02,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:20:02,095 INFO L85 PathProgramCache]: Analyzing trace with hash -426369642, now seen corresponding path program 3 times [2021-11-07 08:20:02,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:20:02,095 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [772639633] [2021-11-07 08:20:02,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:20:02,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:20:02,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:02,252 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:20:02,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:02,255 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:20:02,255 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:20:02,255 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [772639633] [2021-11-07 08:20:02,255 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [772639633] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:02,255 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [383463311] [2021-11-07 08:20:02,256 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 08:20:02,256 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:20:02,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:20:02,258 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:20:02,278 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-07 08:20:02,637 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-07 08:20:02,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:20:02,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-07 08:20:02,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:20:02,994 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:20:02,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [383463311] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:02,995 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:20:02,995 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 20 [2021-11-07 08:20:02,995 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537056848] [2021-11-07 08:20:02,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-07 08:20:02,995 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:20:02,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-07 08:20:02,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-11-07 08:20:02,996 INFO L87 Difference]: Start difference. First operand 270 states and 312 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) [2021-11-07 08:20:03,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:20:03,630 INFO L93 Difference]: Finished difference Result 440 states and 502 transitions. [2021-11-07 08:20:03,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 08:20:03,630 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 [2021-11-07 08:20:03,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:20:03,633 INFO L225 Difference]: With dead ends: 440 [2021-11-07 08:20:03,633 INFO L226 Difference]: Without dead ends: 440 [2021-11-07 08:20:03,634 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=130, Invalid=682, Unknown=0, NotChecked=0, Total=812 [2021-11-07 08:20:03,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 440 states. [2021-11-07 08:20:03,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 440 to 326. [2021-11-07 08:20:03,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 314 states have (on average 1.2006369426751593) internal successors, (377), 318 states have internal predecessors, (377), 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) [2021-11-07 08:20:03,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 384 transitions. [2021-11-07 08:20:03,645 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 384 transitions. Word has length 51 [2021-11-07 08:20:03,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:20:03,645 INFO L470 AbstractCegarLoop]: Abstraction has 326 states and 384 transitions. [2021-11-07 08:20:03,646 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) [2021-11-07 08:20:03,646 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 384 transitions. [2021-11-07 08:20:03,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-07 08:20:03,647 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:20:03,647 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] [2021-11-07 08:20:03,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-07 08:20:03,863 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-07 08:20:03,863 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:20:03,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:20:03,864 INFO L85 PathProgramCache]: Analyzing trace with hash -1427061148, now seen corresponding path program 3 times [2021-11-07 08:20:03,864 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:20:03,864 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [52306903] [2021-11-07 08:20:03,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:20:03,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:20:03,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:04,377 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:20:04,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:04,382 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 10 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 08:20:04,382 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:20:04,382 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [52306903] [2021-11-07 08:20:04,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [52306903] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:04,382 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [554500681] [2021-11-07 08:20:04,382 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 08:20:04,382 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:20:04,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:20:04,390 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:20:04,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-07 08:20:04,797 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-07 08:20:04,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:20:04,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-07 08:20:04,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:20:04,855 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 [2021-11-07 08:20:05,213 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 [2021-11-07 08:20:05,286 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 [2021-11-07 08:20:06,766 INFO L354 Elim1Store]: treesize reduction 71, result has 14.5 percent of original size [2021-11-07 08:20:06,767 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 [2021-11-07 08:20:06,875 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 10 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 08:20:06,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [554500681] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:06,875 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:20:06,875 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19] total 35 [2021-11-07 08:20:06,875 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1633486246] [2021-11-07 08:20:06,876 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-07 08:20:06,876 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:20:06,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-07 08:20:06,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=1093, Unknown=0, NotChecked=0, Total=1190 [2021-11-07 08:20:06,877 INFO L87 Difference]: Start difference. First operand 326 states and 384 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) [2021-11-07 08:20:09,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:20:09,712 INFO L93 Difference]: Finished difference Result 315 states and 366 transitions. [2021-11-07 08:20:09,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-07 08:20:09,712 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 [2021-11-07 08:20:09,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:20:09,715 INFO L225 Difference]: With dead ends: 315 [2021-11-07 08:20:09,715 INFO L226 Difference]: Without dead ends: 281 [2021-11-07 08:20:09,717 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 492 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=315, Invalid=2337, Unknown=0, NotChecked=0, Total=2652 [2021-11-07 08:20:09,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2021-11-07 08:20:09,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 278. [2021-11-07 08:20:09,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 267 states have (on average 1.205992509363296) internal successors, (322), 271 states have internal predecessors, (322), 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) [2021-11-07 08:20:09,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 328 transitions. [2021-11-07 08:20:09,729 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 328 transitions. Word has length 53 [2021-11-07 08:20:09,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:20:09,729 INFO L470 AbstractCegarLoop]: Abstraction has 278 states and 328 transitions. [2021-11-07 08:20:09,729 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) [2021-11-07 08:20:09,729 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 328 transitions. [2021-11-07 08:20:09,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-07 08:20:09,731 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:20:09,731 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] [2021-11-07 08:20:09,759 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-07 08:20:09,946 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-07 08:20:09,946 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:20:09,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:20:09,946 INFO L85 PathProgramCache]: Analyzing trace with hash 1459939393, now seen corresponding path program 2 times [2021-11-07 08:20:09,946 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:20:09,947 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433400859] [2021-11-07 08:20:09,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:20:09,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:20:09,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:10,066 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:20:10,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:10,069 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 23 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 08:20:10,070 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:20:10,070 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1433400859] [2021-11-07 08:20:10,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1433400859] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:10,070 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2126924639] [2021-11-07 08:20:10,070 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 08:20:10,070 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:20:10,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:20:10,071 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:20:10,083 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-07 08:20:10,484 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-07 08:20:10,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:20:10,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 08:20:10,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:20:10,653 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-07 08:20:10,653 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2126924639] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:20:10,653 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-07 08:20:10,653 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [9] total 11 [2021-11-07 08:20:10,654 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593920271] [2021-11-07 08:20:10,654 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 08:20:10,654 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:20:10,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 08:20:10,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-11-07 08:20:10,655 INFO L87 Difference]: Start difference. First operand 278 states and 328 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) [2021-11-07 08:20:10,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:20:10,700 INFO L93 Difference]: Finished difference Result 279 states and 324 transitions. [2021-11-07 08:20:10,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 08:20:10,701 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 [2021-11-07 08:20:10,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:20:10,703 INFO L225 Difference]: With dead ends: 279 [2021-11-07 08:20:10,703 INFO L226 Difference]: Without dead ends: 279 [2021-11-07 08:20:10,703 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 [2021-11-07 08:20:10,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2021-11-07 08:20:10,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 278. [2021-11-07 08:20:10,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 267 states have (on average 1.1910112359550562) internal successors, (318), 271 states have internal predecessors, (318), 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) [2021-11-07 08:20:10,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 324 transitions. [2021-11-07 08:20:10,712 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 324 transitions. Word has length 57 [2021-11-07 08:20:10,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:20:10,712 INFO L470 AbstractCegarLoop]: Abstraction has 278 states and 324 transitions. [2021-11-07 08:20:10,712 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) [2021-11-07 08:20:10,712 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 324 transitions. [2021-11-07 08:20:10,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-07 08:20:10,713 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:20:10,713 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] [2021-11-07 08:20:10,762 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-07 08:20:10,926 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:20:10,926 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:20:10,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:20:10,927 INFO L85 PathProgramCache]: Analyzing trace with hash -1956893617, now seen corresponding path program 1 times [2021-11-07 08:20:10,927 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:20:10,927 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1206428191] [2021-11-07 08:20:10,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:20:10,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:20:10,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:11,086 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:20:11,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:11,089 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:20:11,089 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:20:11,089 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1206428191] [2021-11-07 08:20:11,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1206428191] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:11,090 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1683782473] [2021-11-07 08:20:11,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:20:11,090 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:20:11,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:20:11,090 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:20:11,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-07 08:20:11,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:11,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-07 08:20:11,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:20:11,918 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 1 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:20:11,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1683782473] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:11,919 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:20:11,919 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-11-07 08:20:11,919 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772534332] [2021-11-07 08:20:11,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-07 08:20:11,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:20:11,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-07 08:20:11,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=297, Unknown=0, NotChecked=0, Total=342 [2021-11-07 08:20:11,920 INFO L87 Difference]: Start difference. First operand 278 states and 324 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) [2021-11-07 08:20:12,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:20:12,424 INFO L93 Difference]: Finished difference Result 311 states and 346 transitions. [2021-11-07 08:20:12,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-07 08:20:12,425 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 [2021-11-07 08:20:12,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:20:12,426 INFO L225 Difference]: With dead ends: 311 [2021-11-07 08:20:12,427 INFO L226 Difference]: Without dead ends: 311 [2021-11-07 08:20:12,427 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=117, Invalid=639, Unknown=0, NotChecked=0, Total=756 [2021-11-07 08:20:12,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2021-11-07 08:20:12,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 278. [2021-11-07 08:20:12,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 267 states have (on average 1.1797752808988764) internal successors, (315), 271 states have internal predecessors, (315), 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) [2021-11-07 08:20:12,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 321 transitions. [2021-11-07 08:20:12,436 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 321 transitions. Word has length 57 [2021-11-07 08:20:12,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:20:12,437 INFO L470 AbstractCegarLoop]: Abstraction has 278 states and 321 transitions. [2021-11-07 08:20:12,437 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) [2021-11-07 08:20:12,437 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 321 transitions. [2021-11-07 08:20:12,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-07 08:20:12,438 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:20:12,439 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] [2021-11-07 08:20:12,469 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-07 08:20:12,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:20:12,652 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:20:12,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:20:12,653 INFO L85 PathProgramCache]: Analyzing trace with hash 1613499495, now seen corresponding path program 4 times [2021-11-07 08:20:12,653 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:20:12,653 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853924796] [2021-11-07 08:20:12,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:20:12,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:20:12,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:12,830 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:20:12,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:12,834 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 08:20:12,834 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:20:12,834 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853924796] [2021-11-07 08:20:12,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [853924796] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:12,835 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [458166415] [2021-11-07 08:20:12,835 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 08:20:12,835 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:20:12,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:20:12,836 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:20:12,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-07 08:20:13,484 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 08:20:13,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:20:13,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-07 08:20:13,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:20:13,517 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 [2021-11-07 08:20:13,523 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 [2021-11-07 08:20:13,842 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 [2021-11-07 08:20:13,888 INFO L354 Elim1Store]: treesize reduction 47, result has 19.0 percent of original size [2021-11-07 08:20:13,888 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 [2021-11-07 08:20:14,589 INFO L354 Elim1Store]: treesize reduction 43, result has 55.2 percent of original size [2021-11-07 08:20:14,590 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 [2021-11-07 08:20:14,762 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-07 08:20:14,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [458166415] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:14,762 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:20:14,762 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16] total 25 [2021-11-07 08:20:14,762 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208859550] [2021-11-07 08:20:14,763 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-07 08:20:14,763 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:20:14,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-07 08:20:14,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=585, Unknown=0, NotChecked=0, Total=650 [2021-11-07 08:20:14,764 INFO L87 Difference]: Start difference. First operand 278 states and 321 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) [2021-11-07 08:20:30,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:20:30,229 INFO L93 Difference]: Finished difference Result 332 states and 367 transitions. [2021-11-07 08:20:30,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-07 08:20:30,229 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 [2021-11-07 08:20:30,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:20:30,231 INFO L225 Difference]: With dead ends: 332 [2021-11-07 08:20:30,231 INFO L226 Difference]: Without dead ends: 332 [2021-11-07 08:20:30,232 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 859 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=938, Invalid=4032, Unknown=0, NotChecked=0, Total=4970 [2021-11-07 08:20:30,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2021-11-07 08:20:30,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 278. [2021-11-07 08:20:30,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 267 states have (on average 1.1573033707865168) internal successors, (309), 271 states have internal predecessors, (309), 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) [2021-11-07 08:20:30,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 315 transitions. [2021-11-07 08:20:30,240 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 315 transitions. Word has length 57 [2021-11-07 08:20:30,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:20:30,241 INFO L470 AbstractCegarLoop]: Abstraction has 278 states and 315 transitions. [2021-11-07 08:20:30,241 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) [2021-11-07 08:20:30,241 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 315 transitions. [2021-11-07 08:20:30,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-07 08:20:30,242 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:20:30,242 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] [2021-11-07 08:20:30,279 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-07 08:20:30,466 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:20:30,466 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:20:30,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:20:30,467 INFO L85 PathProgramCache]: Analyzing trace with hash -1510482325, now seen corresponding path program 3 times [2021-11-07 08:20:30,467 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:20:30,467 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1274644268] [2021-11-07 08:20:30,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:20:30,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:20:30,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:30,699 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:20:30,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:30,702 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 1 proven. 38 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:20:30,702 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:20:30,703 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1274644268] [2021-11-07 08:20:30,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1274644268] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:30,703 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668403654] [2021-11-07 08:20:30,703 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 08:20:30,703 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:20:30,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:20:30,704 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:20:30,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-07 08:20:31,396 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-07 08:20:31,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:20:31,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-07 08:20:31,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:20:31,718 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 33 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:20:31,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [668403654] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:31,719 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:20:31,719 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 26 [2021-11-07 08:20:31,719 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633592704] [2021-11-07 08:20:31,720 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-07 08:20:31,720 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:20:31,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-07 08:20:31,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2021-11-07 08:20:31,721 INFO L87 Difference]: Start difference. First operand 278 states and 315 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) [2021-11-07 08:20:32,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:20:32,446 INFO L93 Difference]: Finished difference Result 375 states and 420 transitions. [2021-11-07 08:20:32,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-07 08:20:32,446 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 [2021-11-07 08:20:32,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:20:32,448 INFO L225 Difference]: With dead ends: 375 [2021-11-07 08:20:32,449 INFO L226 Difference]: Without dead ends: 371 [2021-11-07 08:20:32,449 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=164, Invalid=958, Unknown=0, NotChecked=0, Total=1122 [2021-11-07 08:20:32,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2021-11-07 08:20:32,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 261. [2021-11-07 08:20:32,457 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) [2021-11-07 08:20:32,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 295 transitions. [2021-11-07 08:20:32,459 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 295 transitions. Word has length 60 [2021-11-07 08:20:32,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:20:32,459 INFO L470 AbstractCegarLoop]: Abstraction has 261 states and 295 transitions. [2021-11-07 08:20:32,459 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) [2021-11-07 08:20:32,460 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 295 transitions. [2021-11-07 08:20:32,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-07 08:20:32,461 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:20:32,461 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] [2021-11-07 08:20:32,503 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-07 08:20:32,674 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-07 08:20:32,674 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:20:32,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:20:32,675 INFO L85 PathProgramCache]: Analyzing trace with hash -1057888223, now seen corresponding path program 4 times [2021-11-07 08:20:32,675 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:20:32,675 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524794365] [2021-11-07 08:20:32,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:20:32,675 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:20:32,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:33,399 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:20:33,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:33,402 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 21 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:20:33,403 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:20:33,403 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [524794365] [2021-11-07 08:20:33,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [524794365] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:33,403 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1738033387] [2021-11-07 08:20:33,403 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 08:20:33,403 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:20:33,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:20:33,407 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:20:33,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-07 08:20:34,081 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 08:20:34,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:20:34,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-07 08:20:34,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:20:34,109 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 [2021-11-07 08:20:34,117 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 [2021-11-07 08:20:34,546 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 [2021-11-07 08:20:34,617 INFO L354 Elim1Store]: treesize reduction 47, result has 19.0 percent of original size [2021-11-07 08:20:34,617 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 [2021-11-07 08:20:35,532 INFO L354 Elim1Store]: treesize reduction 39, result has 23.5 percent of original size [2021-11-07 08:20:35,533 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 [2021-11-07 08:20:35,670 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 24 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:20:35,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1738033387] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:35,671 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:20:35,671 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 15] total 32 [2021-11-07 08:20:35,671 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986032483] [2021-11-07 08:20:35,671 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-07 08:20:35,672 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:20:35,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-07 08:20:35,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=909, Unknown=0, NotChecked=0, Total=992 [2021-11-07 08:20:35,673 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) [2021-11-07 08:20:50,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:20:50,864 INFO L93 Difference]: Finished difference Result 448 states and 497 transitions. [2021-11-07 08:20:50,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-07 08:20:50,864 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 [2021-11-07 08:20:50,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:20:50,866 INFO L225 Difference]: With dead ends: 448 [2021-11-07 08:20:50,867 INFO L226 Difference]: Without dead ends: 374 [2021-11-07 08:20:50,868 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 13.0s TimeCoverageRelationStatistics Valid=363, Invalid=2828, Unknown=1, NotChecked=0, Total=3192 [2021-11-07 08:20:50,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2021-11-07 08:20:50,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 360. [2021-11-07 08:20:50,876 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) [2021-11-07 08:20:50,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 409 transitions. [2021-11-07 08:20:50,878 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 409 transitions. Word has length 62 [2021-11-07 08:20:50,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:20:50,879 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 409 transitions. [2021-11-07 08:20:50,879 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) [2021-11-07 08:20:50,879 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 409 transitions. [2021-11-07 08:20:50,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 08:20:50,880 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:20:50,881 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] [2021-11-07 08:20:50,933 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-07 08:20:51,102 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-07 08:20:51,103 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:20:51,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:20:51,103 INFO L85 PathProgramCache]: Analyzing trace with hash -1344162434, now seen corresponding path program 5 times [2021-11-07 08:20:51,103 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:20:51,103 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [430539627] [2021-11-07 08:20:51,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:20:51,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:20:51,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:51,306 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:20:51,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:51,310 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 1 proven. 50 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:20:51,310 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:20:51,310 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [430539627] [2021-11-07 08:20:51,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [430539627] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:51,310 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [585676721] [2021-11-07 08:20:51,310 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 08:20:51,311 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:20:51,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:20:51,312 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:20:51,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-07 08:20:52,196 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-07 08:20:52,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:20:52,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-07 08:20:52,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:20:52,241 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-07 08:20:52,241 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 [2021-11-07 08:20:52,245 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 [2021-11-07 08:20:52,819 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 6 proven. 45 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:20:52,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [585676721] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:52,820 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:20:52,820 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 18 [2021-11-07 08:20:52,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621876233] [2021-11-07 08:20:52,820 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-07 08:20:52,820 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:20:52,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-07 08:20:52,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=297, Unknown=0, NotChecked=0, Total=342 [2021-11-07 08:20:52,821 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) [2021-11-07 08:20:53,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:20:53,566 INFO L93 Difference]: Finished difference Result 522 states and 578 transitions. [2021-11-07 08:20:53,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-07 08:20:53,566 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 [2021-11-07 08:20:53,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:20:53,569 INFO L225 Difference]: With dead ends: 522 [2021-11-07 08:20:53,569 INFO L226 Difference]: Without dead ends: 522 [2021-11-07 08:20:53,570 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 [2021-11-07 08:20:53,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2021-11-07 08:20:53,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 429. [2021-11-07 08:20:53,580 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) [2021-11-07 08:20:53,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 490 transitions. [2021-11-07 08:20:53,583 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 490 transitions. Word has length 66 [2021-11-07 08:20:53,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:20:53,583 INFO L470 AbstractCegarLoop]: Abstraction has 429 states and 490 transitions. [2021-11-07 08:20:53,584 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) [2021-11-07 08:20:53,584 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 490 transitions. [2021-11-07 08:20:53,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 08:20:53,585 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:20:53,585 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] [2021-11-07 08:20:53,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-07 08:20:53,810 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-07 08:20:53,810 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:20:53,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:20:53,811 INFO L85 PathProgramCache]: Analyzing trace with hash -322835807, now seen corresponding path program 4 times [2021-11-07 08:20:53,811 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:20:53,812 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752950181] [2021-11-07 08:20:53,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:20:53,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:20:53,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:54,112 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:20:54,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:54,122 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 27 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 08:20:54,122 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:20:54,122 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752950181] [2021-11-07 08:20:54,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [752950181] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:54,122 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [818756033] [2021-11-07 08:20:54,122 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 08:20:54,122 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:20:54,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:20:54,127 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:20:54,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-07 08:20:54,944 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 08:20:54,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:20:54,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-07 08:20:54,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:20:54,988 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-07 08:20:54,988 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 [2021-11-07 08:20:55,002 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 [2021-11-07 08:20:55,475 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 46 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 08:20:55,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [818756033] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:55,476 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:20:55,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 25 [2021-11-07 08:20:55,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693059119] [2021-11-07 08:20:55,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-07 08:20:55,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:20:55,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-07 08:20:55,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2021-11-07 08:20:55,478 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) [2021-11-07 08:20:56,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:20:56,256 INFO L93 Difference]: Finished difference Result 421 states and 470 transitions. [2021-11-07 08:20:56,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-07 08:20:56,258 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 [2021-11-07 08:20:56,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:20:56,260 INFO L225 Difference]: With dead ends: 421 [2021-11-07 08:20:56,260 INFO L226 Difference]: Without dead ends: 337 [2021-11-07 08:20:56,260 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 218 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=258, Invalid=1148, Unknown=0, NotChecked=0, Total=1406 [2021-11-07 08:20:56,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2021-11-07 08:20:56,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 334. [2021-11-07 08:20:56,267 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) [2021-11-07 08:20:56,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 380 transitions. [2021-11-07 08:20:56,269 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 380 transitions. Word has length 67 [2021-11-07 08:20:56,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:20:56,270 INFO L470 AbstractCegarLoop]: Abstraction has 334 states and 380 transitions. [2021-11-07 08:20:56,270 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) [2021-11-07 08:20:56,270 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 380 transitions. [2021-11-07 08:20:56,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 08:20:56,271 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:20:56,271 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] [2021-11-07 08:20:56,310 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-07 08:20:56,498 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-07 08:20:56,498 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:20:56,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:20:56,499 INFO L85 PathProgramCache]: Analyzing trace with hash 1801252708, now seen corresponding path program 5 times [2021-11-07 08:20:56,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:20:56,499 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575519337] [2021-11-07 08:20:56,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:20:56,499 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:20:56,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:57,469 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:20:57,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:20:57,472 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 16 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:20:57,472 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:20:57,473 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575519337] [2021-11-07 08:20:57,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575519337] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:57,473 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1423169839] [2021-11-07 08:20:57,473 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 08:20:57,473 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:20:57,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:20:57,474 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:20:57,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-07 08:20:58,176 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-07 08:20:58,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:20:58,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-07 08:20:58,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:20:58,472 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 [2021-11-07 08:20:58,865 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 [2021-11-07 08:20:58,882 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 08:20:58,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1423169839] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:20:58,882 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:20:58,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 17] total 35 [2021-11-07 08:20:58,882 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867311567] [2021-11-07 08:20:58,883 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-07 08:20:58,883 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:20:58,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-07 08:20:58,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=1104, Unknown=0, NotChecked=0, Total=1190 [2021-11-07 08:20:58,884 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) [2021-11-07 08:21:02,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:21:02,120 INFO L93 Difference]: Finished difference Result 680 states and 750 transitions. [2021-11-07 08:21:02,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-07 08:21:02,123 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 [2021-11-07 08:21:02,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:21:02,127 INFO L225 Difference]: With dead ends: 680 [2021-11-07 08:21:02,127 INFO L226 Difference]: Without dead ends: 656 [2021-11-07 08:21:02,129 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 634 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=365, Invalid=3667, Unknown=0, NotChecked=0, Total=4032 [2021-11-07 08:21:02,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 656 states. [2021-11-07 08:21:02,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 656 to 443. [2021-11-07 08:21:02,144 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) [2021-11-07 08:21:02,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 443 states to 443 states and 501 transitions. [2021-11-07 08:21:02,146 INFO L78 Accepts]: Start accepts. Automaton has 443 states and 501 transitions. Word has length 71 [2021-11-07 08:21:02,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:21:02,147 INFO L470 AbstractCegarLoop]: Abstraction has 443 states and 501 transitions. [2021-11-07 08:21:02,147 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) [2021-11-07 08:21:02,147 INFO L276 IsEmpty]: Start isEmpty. Operand 443 states and 501 transitions. [2021-11-07 08:21:02,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-07 08:21:02,148 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:21:02,149 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] [2021-11-07 08:21:02,186 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-07 08:21:02,364 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-07 08:21:02,364 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:21:02,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:21:02,364 INFO L85 PathProgramCache]: Analyzing trace with hash -1648662191, now seen corresponding path program 2 times [2021-11-07 08:21:02,364 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:21:02,365 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1660770896] [2021-11-07 08:21:02,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:21:02,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:21:02,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:21:02,586 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:21:02,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:21:02,589 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 1 proven. 58 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:21:02,589 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:21:02,589 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1660770896] [2021-11-07 08:21:02,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1660770896] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:21:02,589 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106299337] [2021-11-07 08:21:02,590 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 08:21:02,590 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:21:02,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:21:02,591 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:21:02,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-07 08:21:03,340 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 08:21:03,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:21:03,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-07 08:21:03,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:21:03,376 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-07 08:21:03,376 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 [2021-11-07 08:21:03,379 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 [2021-11-07 08:21:03,930 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 6 proven. 53 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:21:03,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2106299337] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:21:03,931 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:21:03,931 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 23 [2021-11-07 08:21:03,931 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140737392] [2021-11-07 08:21:03,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-07 08:21:03,932 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:21:03,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-07 08:21:03,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=496, Unknown=0, NotChecked=0, Total=552 [2021-11-07 08:21:03,933 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) [2021-11-07 08:21:04,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:21:04,608 INFO L93 Difference]: Finished difference Result 480 states and 526 transitions. [2021-11-07 08:21:04,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-07 08:21:04,609 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 [2021-11-07 08:21:04,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:21:04,611 INFO L225 Difference]: With dead ends: 480 [2021-11-07 08:21:04,611 INFO L226 Difference]: Without dead ends: 480 [2021-11-07 08:21:04,612 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=154, Invalid=1106, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 08:21:04,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 480 states. [2021-11-07 08:21:04,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 480 to 443. [2021-11-07 08:21:04,620 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) [2021-11-07 08:21:04,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 443 states to 443 states and 498 transitions. [2021-11-07 08:21:04,623 INFO L78 Accepts]: Start accepts. Automaton has 443 states and 498 transitions. Word has length 72 [2021-11-07 08:21:04,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:21:04,623 INFO L470 AbstractCegarLoop]: Abstraction has 443 states and 498 transitions. [2021-11-07 08:21:04,623 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) [2021-11-07 08:21:04,623 INFO L276 IsEmpty]: Start isEmpty. Operand 443 states and 498 transitions. [2021-11-07 08:21:04,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-07 08:21:04,625 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:21:04,625 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] [2021-11-07 08:21:04,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-07 08:21:04,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-11-07 08:21:04,838 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:21:04,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:21:04,839 INFO L85 PathProgramCache]: Analyzing trace with hash -1144910361, now seen corresponding path program 6 times [2021-11-07 08:21:04,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:21:04,839 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1740504475] [2021-11-07 08:21:04,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:21:04,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:21:04,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:21:05,063 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:21:05,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:21:05,067 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 6 proven. 68 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 08:21:05,067 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:21:05,067 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1740504475] [2021-11-07 08:21:05,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1740504475] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:21:05,067 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [627409960] [2021-11-07 08:21:05,067 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-07 08:21:05,067 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:21:05,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:21:05,069 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:21:05,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-07 08:21:05,883 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-07 08:21:05,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:21:05,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-07 08:21:05,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:21:05,916 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:21:05,916 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 [2021-11-07 08:21:06,591 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 15 proven. 59 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 08:21:06,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [627409960] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:21:06,591 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:21:06,591 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 30 [2021-11-07 08:21:06,591 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635754496] [2021-11-07 08:21:06,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-07 08:21:06,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:21:06,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-07 08:21:06,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=820, Unknown=0, NotChecked=0, Total=930 [2021-11-07 08:21:06,593 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) [2021-11-07 08:21:07,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:21:07,645 INFO L93 Difference]: Finished difference Result 551 states and 611 transitions. [2021-11-07 08:21:07,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-07 08:21:07,645 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 [2021-11-07 08:21:07,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:21:07,648 INFO L225 Difference]: With dead ends: 551 [2021-11-07 08:21:07,648 INFO L226 Difference]: Without dead ends: 549 [2021-11-07 08:21:07,649 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=205, Invalid=1277, Unknown=0, NotChecked=0, Total=1482 [2021-11-07 08:21:07,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 549 states. [2021-11-07 08:21:07,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 549 to 471. [2021-11-07 08:21:07,660 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) [2021-11-07 08:21:07,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 530 transitions. [2021-11-07 08:21:07,662 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 530 transitions. Word has length 75 [2021-11-07 08:21:07,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:21:07,663 INFO L470 AbstractCegarLoop]: Abstraction has 471 states and 530 transitions. [2021-11-07 08:21:07,663 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) [2021-11-07 08:21:07,663 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 530 transitions. [2021-11-07 08:21:07,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-07 08:21:07,664 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:21:07,665 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] [2021-11-07 08:21:07,702 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-07 08:21:07,890 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:21:07,890 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:21:07,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:21:07,891 INFO L85 PathProgramCache]: Analyzing trace with hash -1940926663, now seen corresponding path program 6 times [2021-11-07 08:21:07,891 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:21:07,891 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1101768316] [2021-11-07 08:21:07,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:21:07,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:21:07,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:21:08,198 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:21:08,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:21:08,202 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 31 proven. 54 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:21:08,202 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:21:08,202 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1101768316] [2021-11-07 08:21:08,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1101768316] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:21:08,203 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1162845005] [2021-11-07 08:21:08,203 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-07 08:21:08,203 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:21:08,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:21:08,204 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:21:08,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-07 08:21:09,084 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-07 08:21:09,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:21:09,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-07 08:21:09,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:21:09,109 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 [2021-11-07 08:21:09,380 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 [2021-11-07 08:21:09,433 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-07 08:21:09,433 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 [2021-11-07 08:21:10,694 INFO L354 Elim1Store]: treesize reduction 77, result has 9.4 percent of original size [2021-11-07 08:21:10,694 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 [2021-11-07 08:21:10,720 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 41 proven. 44 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:21:10,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1162845005] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:21:10,721 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:21:10,721 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18] total 31 [2021-11-07 08:21:10,721 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248109040] [2021-11-07 08:21:10,722 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-07 08:21:10,722 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:21:10,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-07 08:21:10,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=853, Unknown=0, NotChecked=0, Total=930 [2021-11-07 08:21:10,723 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) [2021-11-07 08:22:10,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:22:10,804 INFO L93 Difference]: Finished difference Result 838 states and 928 transitions. [2021-11-07 08:22:10,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-07 08:22:10,804 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 [2021-11-07 08:22:10,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:22:10,807 INFO L225 Difference]: With dead ends: 838 [2021-11-07 08:22:10,807 INFO L226 Difference]: Without dead ends: 654 [2021-11-07 08:22:10,808 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 23.4s TimeCoverageRelationStatistics Valid=187, Invalid=1783, Unknown=10, NotChecked=0, Total=1980 [2021-11-07 08:22:10,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 654 states. [2021-11-07 08:22:10,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 654 to 635. [2021-11-07 08:22:10,821 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) [2021-11-07 08:22:10,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 635 states to 635 states and 720 transitions. [2021-11-07 08:22:10,824 INFO L78 Accepts]: Start accepts. Automaton has 635 states and 720 transitions. Word has length 77 [2021-11-07 08:22:10,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:22:10,824 INFO L470 AbstractCegarLoop]: Abstraction has 635 states and 720 transitions. [2021-11-07 08:22:10,824 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) [2021-11-07 08:22:10,824 INFO L276 IsEmpty]: Start isEmpty. Operand 635 states and 720 transitions. [2021-11-07 08:22:10,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-07 08:22:10,826 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:22:10,826 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] [2021-11-07 08:22:10,857 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-07 08:22:11,042 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:22:11,042 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:22:11,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:22:11,043 INFO L85 PathProgramCache]: Analyzing trace with hash -1037435844, now seen corresponding path program 7 times [2021-11-07 08:22:11,043 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:22:11,043 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1107124552] [2021-11-07 08:22:11,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:22:11,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:22:11,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:22:11,264 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:22:11,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:22:11,266 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 6 proven. 92 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:22:11,267 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:22:11,267 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1107124552] [2021-11-07 08:22:11,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1107124552] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:22:11,267 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1043062379] [2021-11-07 08:22:11,267 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 08:22:11,267 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:22:11,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:22:11,268 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:22:11,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-07 08:22:12,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:22:12,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-07 08:22:12,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:22:12,687 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 15 proven. 83 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:22:12,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1043062379] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:22:12,687 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:22:12,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2021-11-07 08:22:12,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856702558] [2021-11-07 08:22:12,687 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-07 08:22:12,687 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:22:12,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-07 08:22:12,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2021-11-07 08:22:12,688 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) [2021-11-07 08:22:13,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:22:13,562 INFO L93 Difference]: Finished difference Result 865 states and 962 transitions. [2021-11-07 08:22:13,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-07 08:22:13,563 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 [2021-11-07 08:22:13,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:22:13,567 INFO L225 Difference]: With dead ends: 865 [2021-11-07 08:22:13,567 INFO L226 Difference]: Without dead ends: 865 [2021-11-07 08:22:13,568 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=137, Invalid=855, Unknown=0, NotChecked=0, Total=992 [2021-11-07 08:22:13,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 865 states. [2021-11-07 08:22:13,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 865 to 736. [2021-11-07 08:22:13,584 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) [2021-11-07 08:22:13,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 736 states to 736 states and 837 transitions. [2021-11-07 08:22:13,587 INFO L78 Accepts]: Start accepts. Automaton has 736 states and 837 transitions. Word has length 81 [2021-11-07 08:22:13,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:22:13,588 INFO L470 AbstractCegarLoop]: Abstraction has 736 states and 837 transitions. [2021-11-07 08:22:13,588 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) [2021-11-07 08:22:13,588 INFO L276 IsEmpty]: Start isEmpty. Operand 736 states and 837 transitions. [2021-11-07 08:22:13,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-07 08:22:13,590 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:22:13,590 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] [2021-11-07 08:22:13,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-07 08:22:13,814 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-11-07 08:22:13,814 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:22:13,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:22:13,815 INFO L85 PathProgramCache]: Analyzing trace with hash 1208391589, now seen corresponding path program 7 times [2021-11-07 08:22:13,815 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:22:13,815 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899987323] [2021-11-07 08:22:13,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:22:13,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:22:13,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:22:14,079 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:22:14,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:22:14,083 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 49 proven. 41 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 08:22:14,083 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:22:14,083 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899987323] [2021-11-07 08:22:14,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [899987323] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:22:14,084 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1210157398] [2021-11-07 08:22:14,084 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 08:22:14,084 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:22:14,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:22:14,085 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:22:14,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-07 08:22:15,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:22:15,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-07 08:22:15,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:22:15,475 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-07 08:22:15,476 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 [2021-11-07 08:22:15,478 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 [2021-11-07 08:22:16,062 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 75 proven. 15 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 08:22:16,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1210157398] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:22:16,063 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:22:16,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 29 [2021-11-07 08:22:16,063 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986826799] [2021-11-07 08:22:16,063 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-07 08:22:16,063 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:22:16,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-07 08:22:16,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=697, Unknown=0, NotChecked=0, Total=812 [2021-11-07 08:22:16,064 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) [2021-11-07 08:22:16,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:22:16,927 INFO L93 Difference]: Finished difference Result 734 states and 816 transitions. [2021-11-07 08:22:16,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-07 08:22:16,927 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 [2021-11-07 08:22:16,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:22:16,930 INFO L225 Difference]: With dead ends: 734 [2021-11-07 08:22:16,930 INFO L226 Difference]: Without dead ends: 579 [2021-11-07 08:22:16,931 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 318 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=338, Invalid=1554, Unknown=0, NotChecked=0, Total=1892 [2021-11-07 08:22:16,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 579 states. [2021-11-07 08:22:16,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 579 to 576. [2021-11-07 08:22:16,941 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) [2021-11-07 08:22:16,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 576 states to 576 states and 651 transitions. [2021-11-07 08:22:16,943 INFO L78 Accepts]: Start accepts. Automaton has 576 states and 651 transitions. Word has length 82 [2021-11-07 08:22:16,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:22:16,943 INFO L470 AbstractCegarLoop]: Abstraction has 576 states and 651 transitions. [2021-11-07 08:22:16,944 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) [2021-11-07 08:22:16,944 INFO L276 IsEmpty]: Start isEmpty. Operand 576 states and 651 transitions. [2021-11-07 08:22:16,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-07 08:22:16,945 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:22:16,945 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] [2021-11-07 08:22:16,974 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-07 08:22:17,162 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-11-07 08:22:17,162 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:22:17,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:22:17,163 INFO L85 PathProgramCache]: Analyzing trace with hash 2040468610, now seen corresponding path program 8 times [2021-11-07 08:22:17,163 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:22:17,163 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351222450] [2021-11-07 08:22:17,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:22:17,163 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:22:17,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:22:18,629 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:22:18,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:22:18,648 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 21 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:22:18,648 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:22:18,648 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351222450] [2021-11-07 08:22:18,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [351222450] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:22:18,648 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [236624755] [2021-11-07 08:22:18,649 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 08:22:18,649 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:22:18,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:22:18,663 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:22:18,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-07 08:22:19,682 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 08:22:19,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:22:19,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-07 08:22:19,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:22:20,049 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 [2021-11-07 08:22:20,599 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 [2021-11-07 08:22:20,618 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 21 proven. 82 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 08:22:20,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [236624755] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:22:20,619 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:22:20,619 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 19] total 39 [2021-11-07 08:22:20,619 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417050272] [2021-11-07 08:22:20,619 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-07 08:22:20,620 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:22:20,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-07 08:22:20,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1387, Unknown=0, NotChecked=0, Total=1482 [2021-11-07 08:22:20,621 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) [2021-11-07 08:22:25,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:22:25,377 INFO L93 Difference]: Finished difference Result 1111 states and 1225 transitions. [2021-11-07 08:22:25,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-07 08:22:25,378 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 [2021-11-07 08:22:25,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:22:25,383 INFO L225 Difference]: With dead ends: 1111 [2021-11-07 08:22:25,383 INFO L226 Difference]: Without dead ends: 1081 [2021-11-07 08:22:25,385 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 777 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=414, Invalid=4698, Unknown=0, NotChecked=0, Total=5112 [2021-11-07 08:22:25,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1081 states. [2021-11-07 08:22:25,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1081 to 745. [2021-11-07 08:22:25,404 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) [2021-11-07 08:22:25,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 745 states to 745 states and 839 transitions. [2021-11-07 08:22:25,407 INFO L78 Accepts]: Start accepts. Automaton has 745 states and 839 transitions. Word has length 86 [2021-11-07 08:22:25,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:22:25,408 INFO L470 AbstractCegarLoop]: Abstraction has 745 states and 839 transitions. [2021-11-07 08:22:25,408 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) [2021-11-07 08:22:25,408 INFO L276 IsEmpty]: Start isEmpty. Operand 745 states and 839 transitions. [2021-11-07 08:22:25,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-07 08:22:25,410 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:22:25,410 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] [2021-11-07 08:22:25,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-07 08:22:25,624 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-07 08:22:25,625 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:22:25,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:22:25,625 INFO L85 PathProgramCache]: Analyzing trace with hash -1166482891, now seen corresponding path program 3 times [2021-11-07 08:22:25,625 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:22:25,625 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499401408] [2021-11-07 08:22:25,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:22:25,625 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:22:25,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:22:25,909 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:22:25,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:22:25,913 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 6 proven. 102 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:22:25,914 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:22:25,914 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499401408] [2021-11-07 08:22:25,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499401408] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:22:25,914 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1838835882] [2021-11-07 08:22:25,914 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 08:22:25,914 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:22:25,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:22:25,919 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:22:25,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-07 08:22:27,466 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-07 08:22:27,466 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:22:27,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-07 08:22:27,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:22:27,508 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:22:27,508 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 [2021-11-07 08:22:27,523 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 [2021-11-07 08:22:28,041 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 [2021-11-07 08:22:28,078 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 [2021-11-07 08:22:29,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 08:22:29,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 08:22:29,458 INFO L354 Elim1Store]: treesize reduction 42, result has 31.1 percent of original size [2021-11-07 08:22:29,458 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 [2021-11-07 08:22:29,747 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 19 proven. 59 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-07 08:22:29,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1838835882] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:22:29,748 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:22:29,748 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 33 [2021-11-07 08:22:29,748 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108253790] [2021-11-07 08:22:29,748 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-07 08:22:29,748 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:22:29,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-07 08:22:29,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1037, Unknown=0, NotChecked=0, Total=1122 [2021-11-07 08:22:29,749 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) [2021-11-07 08:22:40,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:22:40,101 INFO L93 Difference]: Finished difference Result 1664 states and 1832 transitions. [2021-11-07 08:22:40,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-11-07 08:22:40,102 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 [2021-11-07 08:22:40,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:22:40,108 INFO L225 Difference]: With dead ends: 1664 [2021-11-07 08:22:40,108 INFO L226 Difference]: Without dead ends: 1664 [2021-11-07 08:22:40,109 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3650 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=1882, Invalid=10550, Unknown=0, NotChecked=0, Total=12432 [2021-11-07 08:22:40,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1664 states. [2021-11-07 08:22:40,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1664 to 1309. [2021-11-07 08:22:40,132 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) [2021-11-07 08:22:40,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1309 states to 1309 states and 1479 transitions. [2021-11-07 08:22:40,137 INFO L78 Accepts]: Start accepts. Automaton has 1309 states and 1479 transitions. Word has length 87 [2021-11-07 08:22:40,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:22:40,138 INFO L470 AbstractCegarLoop]: Abstraction has 1309 states and 1479 transitions. [2021-11-07 08:22:40,138 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) [2021-11-07 08:22:40,138 INFO L276 IsEmpty]: Start isEmpty. Operand 1309 states and 1479 transitions. [2021-11-07 08:22:40,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-07 08:22:40,140 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:22:40,140 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] [2021-11-07 08:22:40,186 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-11-07 08:22:40,363 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-07 08:22:40,363 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:22:40,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:22:40,364 INFO L85 PathProgramCache]: Analyzing trace with hash 2096045983, now seen corresponding path program 9 times [2021-11-07 08:22:40,364 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:22:40,364 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853685444] [2021-11-07 08:22:40,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:22:40,364 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:22:40,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:22:40,724 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:22:40,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:22:40,728 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 15 proven. 105 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 08:22:40,728 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:22:40,729 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853685444] [2021-11-07 08:22:40,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [853685444] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:22:40,729 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [799284287] [2021-11-07 08:22:40,729 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 08:22:40,729 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:22:40,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:22:40,730 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:22:40,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-07 08:22:42,119 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-07 08:22:42,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:22:42,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-07 08:22:42,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:22:42,157 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:22:42,158 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 [2021-11-07 08:22:43,043 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 28 proven. 92 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 08:22:43,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [799284287] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:22:43,043 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:22:43,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 34 [2021-11-07 08:22:43,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661767589] [2021-11-07 08:22:43,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-07 08:22:43,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:22:43,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-07 08:22:43,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=1052, Unknown=0, NotChecked=0, Total=1190 [2021-11-07 08:22:43,045 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) [2021-11-07 08:22:44,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:22:44,425 INFO L93 Difference]: Finished difference Result 1558 states and 1748 transitions. [2021-11-07 08:22:44,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-07 08:22:44,426 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 [2021-11-07 08:22:44,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:22:44,435 INFO L225 Difference]: With dead ends: 1558 [2021-11-07 08:22:44,435 INFO L226 Difference]: Without dead ends: 1556 [2021-11-07 08:22:44,436 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=252, Invalid=1640, Unknown=0, NotChecked=0, Total=1892 [2021-11-07 08:22:44,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1556 states. [2021-11-07 08:22:44,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1556 to 1372. [2021-11-07 08:22:44,467 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) [2021-11-07 08:22:44,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1372 states to 1372 states and 1551 transitions. [2021-11-07 08:22:44,473 INFO L78 Accepts]: Start accepts. Automaton has 1372 states and 1551 transitions. Word has length 90 [2021-11-07 08:22:44,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:22:44,473 INFO L470 AbstractCegarLoop]: Abstraction has 1372 states and 1551 transitions. [2021-11-07 08:22:44,473 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) [2021-11-07 08:22:44,474 INFO L276 IsEmpty]: Start isEmpty. Operand 1372 states and 1551 transitions. [2021-11-07 08:22:44,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-07 08:22:44,476 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:22:44,476 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] [2021-11-07 08:22:44,516 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-07 08:22:44,690 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:22:44,690 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:22:44,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:22:44,691 INFO L85 PathProgramCache]: Analyzing trace with hash 102270395, now seen corresponding path program 8 times [2021-11-07 08:22:44,691 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:22:44,691 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [963210036] [2021-11-07 08:22:44,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:22:44,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:22:44,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:22:45,129 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:22:45,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:22:45,132 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 41 proven. 102 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:22:45,133 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:22:45,133 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [963210036] [2021-11-07 08:22:45,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [963210036] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:22:45,133 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1008129570] [2021-11-07 08:22:45,133 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 08:22:45,133 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:22:45,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:22:45,134 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:22:45,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-07 08:22:46,436 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 08:22:46,436 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:22:46,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-07 08:22:46,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:22:46,463 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 [2021-11-07 08:22:46,767 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 [2021-11-07 08:22:46,841 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-07 08:22:46,841 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 [2021-11-07 08:22:49,595 INFO L354 Elim1Store]: treesize reduction 33, result has 26.7 percent of original size [2021-11-07 08:22:49,596 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 [2021-11-07 08:22:49,821 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 15 proven. 128 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:22:49,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1008129570] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:22:49,822 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:22:49,822 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 35 [2021-11-07 08:22:49,822 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661280804] [2021-11-07 08:22:49,822 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-07 08:22:49,822 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:22:49,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-07 08:22:49,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1101, Unknown=0, NotChecked=0, Total=1190 [2021-11-07 08:22:49,823 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) [2021-11-07 08:23:01,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:23:01,671 INFO L93 Difference]: Finished difference Result 3047 states and 3394 transitions. [2021-11-07 08:23:01,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-07 08:23:01,672 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 [2021-11-07 08:23:01,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:23:01,682 INFO L225 Difference]: With dead ends: 3047 [2021-11-07 08:23:01,682 INFO L226 Difference]: Without dead ends: 2434 [2021-11-07 08:23:01,683 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 513 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=319, Invalid=3220, Unknown=1, NotChecked=0, Total=3540 [2021-11-07 08:23:01,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2434 states. [2021-11-07 08:23:01,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2434 to 1896. [2021-11-07 08:23:01,721 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) [2021-11-07 08:23:01,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1896 states to 1896 states and 2152 transitions. [2021-11-07 08:23:01,728 INFO L78 Accepts]: Start accepts. Automaton has 1896 states and 2152 transitions. Word has length 92 [2021-11-07 08:23:01,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:23:01,729 INFO L470 AbstractCegarLoop]: Abstraction has 1896 states and 2152 transitions. [2021-11-07 08:23:01,729 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) [2021-11-07 08:23:01,729 INFO L276 IsEmpty]: Start isEmpty. Operand 1896 states and 2152 transitions. [2021-11-07 08:23:01,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-07 08:23:01,732 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:23:01,732 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] [2021-11-07 08:23:01,782 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-07 08:23:01,946 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-07 08:23:01,946 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:23:01,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:23:01,947 INFO L85 PathProgramCache]: Analyzing trace with hash -401824019, now seen corresponding path program 10 times [2021-11-07 08:23:01,947 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:23:01,947 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [298394009] [2021-11-07 08:23:01,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:23:01,947 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:23:01,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:23:02,312 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:23:02,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:23:02,316 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 61 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 08:23:02,316 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:23:02,316 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [298394009] [2021-11-07 08:23:02,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [298394009] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:23:02,316 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2088150953] [2021-11-07 08:23:02,317 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 08:23:02,317 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:23:02,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:23:02,318 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:23:02,342 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-07 08:23:03,965 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 08:23:03,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:23:03,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-07 08:23:03,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:23:03,997 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-07 08:23:03,998 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 [2021-11-07 08:23:04,000 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 [2021-11-07 08:23:04,656 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 111 proven. 28 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 08:23:04,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2088150953] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:23:04,656 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:23:04,656 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 33 [2021-11-07 08:23:04,656 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115382578] [2021-11-07 08:23:04,656 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-07 08:23:04,657 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:23:04,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-07 08:23:04,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=905, Unknown=0, NotChecked=0, Total=1056 [2021-11-07 08:23:04,657 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) [2021-11-07 08:23:05,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:23:05,772 INFO L93 Difference]: Finished difference Result 1908 states and 2138 transitions. [2021-11-07 08:23:05,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-07 08:23:05,773 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 [2021-11-07 08:23:05,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:23:05,779 INFO L225 Difference]: With dead ends: 1908 [2021-11-07 08:23:05,779 INFO L226 Difference]: Without dead ends: 1660 [2021-11-07 08:23:05,779 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 434 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=431, Invalid=2019, Unknown=0, NotChecked=0, Total=2450 [2021-11-07 08:23:05,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1660 states. [2021-11-07 08:23:05,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1660 to 1657. [2021-11-07 08:23:05,802 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) [2021-11-07 08:23:05,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1657 states to 1657 states and 1874 transitions. [2021-11-07 08:23:05,806 INFO L78 Accepts]: Start accepts. Automaton has 1657 states and 1874 transitions. Word has length 97 [2021-11-07 08:23:05,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:23:05,807 INFO L470 AbstractCegarLoop]: Abstraction has 1657 states and 1874 transitions. [2021-11-07 08:23:05,807 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) [2021-11-07 08:23:05,807 INFO L276 IsEmpty]: Start isEmpty. Operand 1657 states and 1874 transitions. [2021-11-07 08:23:05,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-07 08:23:05,810 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:23:05,810 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] [2021-11-07 08:23:05,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-07 08:23:06,026 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-07 08:23:06,026 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:23:06,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:23:06,027 INFO L85 PathProgramCache]: Analyzing trace with hash -1244056464, now seen corresponding path program 11 times [2021-11-07 08:23:06,027 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:23:06,027 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1244571328] [2021-11-07 08:23:06,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:23:06,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:23:06,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:23:07,374 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:23:07,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:23:07,377 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 26 proven. 175 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:23:07,377 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:23:07,378 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1244571328] [2021-11-07 08:23:07,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1244571328] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:23:07,378 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1892058355] [2021-11-07 08:23:07,378 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 08:23:07,378 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:23:07,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:23:07,379 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:23:07,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-07 08:23:08,838 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-11-07 08:23:08,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:23:08,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-07 08:23:08,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:23:08,890 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:23:08,891 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 [2021-11-07 08:23:09,719 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 [2021-11-07 08:23:10,636 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 08:23:10,636 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 [2021-11-07 08:23:10,992 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 1 proven. 185 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 08:23:10,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1892058355] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:23:10,992 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:23:10,993 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 23] total 53 [2021-11-07 08:23:10,993 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412351888] [2021-11-07 08:23:10,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-07 08:23:10,994 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:23:10,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-07 08:23:10,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=2630, Unknown=0, NotChecked=0, Total=2756 [2021-11-07 08:23:10,995 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) [2021-11-07 08:23:18,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:23:18,583 INFO L93 Difference]: Finished difference Result 2696 states and 2997 transitions. [2021-11-07 08:23:18,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-11-07 08:23:18,583 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 [2021-11-07 08:23:18,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:23:18,595 INFO L225 Difference]: With dead ends: 2696 [2021-11-07 08:23:18,595 INFO L226 Difference]: Without dead ends: 2661 [2021-11-07 08:23:18,596 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 [2021-11-07 08:23:18,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2661 states. [2021-11-07 08:23:18,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2661 to 2216. [2021-11-07 08:23:18,639 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) [2021-11-07 08:23:18,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2216 states to 2216 states and 2501 transitions. [2021-11-07 08:23:18,644 INFO L78 Accepts]: Start accepts. Automaton has 2216 states and 2501 transitions. Word has length 101 [2021-11-07 08:23:18,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:23:18,644 INFO L470 AbstractCegarLoop]: Abstraction has 2216 states and 2501 transitions. [2021-11-07 08:23:18,645 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) [2021-11-07 08:23:18,645 INFO L276 IsEmpty]: Start isEmpty. Operand 2216 states and 2501 transitions. [2021-11-07 08:23:18,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-07 08:23:18,648 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:23:18,648 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] [2021-11-07 08:23:18,696 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-07 08:23:18,862 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:23:18,862 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:23:18,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:23:18,863 INFO L85 PathProgramCache]: Analyzing trace with hash -1454733793, now seen corresponding path program 9 times [2021-11-07 08:23:18,863 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:23:18,863 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1845658773] [2021-11-07 08:23:18,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:23:18,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:23:18,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:23:19,347 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:23:19,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:23:19,350 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 51 proven. 165 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:23:19,350 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:23:19,350 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1845658773] [2021-11-07 08:23:19,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1845658773] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:23:19,350 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1276190959] [2021-11-07 08:23:19,351 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 08:23:19,351 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:23:19,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:23:19,351 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:23:19,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-07 08:23:20,929 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-07 08:23:20,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:23:20,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-07 08:23:20,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:23:21,027 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:23:21,027 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 [2021-11-07 08:23:21,039 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 [2021-11-07 08:23:21,714 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 [2021-11-07 08:23:21,777 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-07 08:23:21,777 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 [2021-11-07 08:23:23,776 INFO L354 Elim1Store]: treesize reduction 39, result has 26.4 percent of original size [2021-11-07 08:23:23,776 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 [2021-11-07 08:23:23,947 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 141 proven. 75 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:23:23,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1276190959] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:23:23,947 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:23:23,947 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 38 [2021-11-07 08:23:23,947 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401585769] [2021-11-07 08:23:23,948 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-07 08:23:23,948 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:23:23,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-07 08:23:23,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1302, Unknown=0, NotChecked=0, Total=1406 [2021-11-07 08:23:23,949 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) [2021-11-07 08:23:43,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:23:43,411 INFO L93 Difference]: Finished difference Result 3499 states and 3905 transitions. [2021-11-07 08:23:43,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-07 08:23:43,411 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 [2021-11-07 08:23:43,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:23:43,423 INFO L225 Difference]: With dead ends: 3499 [2021-11-07 08:23:43,423 INFO L226 Difference]: Without dead ends: 2872 [2021-11-07 08:23:43,424 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=257, Invalid=2823, Unknown=0, NotChecked=0, Total=3080 [2021-11-07 08:23:43,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2872 states. [2021-11-07 08:23:43,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2872 to 2707. [2021-11-07 08:23:43,463 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) [2021-11-07 08:23:43,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2707 states to 2707 states and 3051 transitions. [2021-11-07 08:23:43,469 INFO L78 Accepts]: Start accepts. Automaton has 2707 states and 3051 transitions. Word has length 107 [2021-11-07 08:23:43,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:23:43,469 INFO L470 AbstractCegarLoop]: Abstraction has 2707 states and 3051 transitions. [2021-11-07 08:23:43,470 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) [2021-11-07 08:23:43,470 INFO L276 IsEmpty]: Start isEmpty. Operand 2707 states and 3051 transitions. [2021-11-07 08:23:43,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-07 08:23:43,474 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:23:43,474 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] [2021-11-07 08:23:43,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-07 08:23:43,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:23:43,689 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:23:43,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:23:43,689 INFO L85 PathProgramCache]: Analyzing trace with hash -812495902, now seen corresponding path program 10 times [2021-11-07 08:23:43,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:23:43,690 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1463477480] [2021-11-07 08:23:43,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:23:43,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:23:43,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:23:44,044 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:23:44,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:23:44,047 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 28 proven. 209 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:23:44,047 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:23:44,047 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1463477480] [2021-11-07 08:23:44,048 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1463477480] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:23:44,048 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [771034788] [2021-11-07 08:23:44,048 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 08:23:44,048 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:23:44,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:23:44,048 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:23:44,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-07 08:23:45,671 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 08:23:45,671 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:23:45,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-07 08:23:45,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:23:45,705 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:23:45,705 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 [2021-11-07 08:23:46,276 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 [2021-11-07 08:23:46,338 INFO L354 Elim1Store]: treesize reduction 41, result has 18.0 percent of original size [2021-11-07 08:23:46,338 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 [2021-11-07 08:23:52,456 INFO L354 Elim1Store]: treesize reduction 18, result has 61.7 percent of original size [2021-11-07 08:23:52,456 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 [2021-11-07 08:23:52,871 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 115 proven. 57 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-07 08:23:52,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [771034788] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:23:52,871 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:23:52,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19] total 36 [2021-11-07 08:23:52,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845173843] [2021-11-07 08:23:52,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-07 08:23:52,872 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:23:52,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-07 08:23:52,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1221, Unknown=1, NotChecked=0, Total=1332 [2021-11-07 08:23:52,873 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) [2021-11-07 08:23:57,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:23:57,301 INFO L93 Difference]: Finished difference Result 3421 states and 3832 transitions. [2021-11-07 08:23:57,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-07 08:23:57,302 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 [2021-11-07 08:23:57,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:23:57,314 INFO L225 Difference]: With dead ends: 3421 [2021-11-07 08:23:57,314 INFO L226 Difference]: Without dead ends: 3340 [2021-11-07 08:23:57,318 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1058 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=535, Invalid=4434, Unknown=1, NotChecked=0, Total=4970 [2021-11-07 08:23:57,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3340 states. [2021-11-07 08:23:57,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3340 to 2972. [2021-11-07 08:23:57,358 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) [2021-11-07 08:23:57,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2972 states to 2972 states and 3362 transitions. [2021-11-07 08:23:57,364 INFO L78 Accepts]: Start accepts. Automaton has 2972 states and 3362 transitions. Word has length 111 [2021-11-07 08:23:57,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:23:57,365 INFO L470 AbstractCegarLoop]: Abstraction has 2972 states and 3362 transitions. [2021-11-07 08:23:57,365 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) [2021-11-07 08:23:57,365 INFO L276 IsEmpty]: Start isEmpty. Operand 2972 states and 3362 transitions. [2021-11-07 08:23:57,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-07 08:23:57,370 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:23:57,370 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] [2021-11-07 08:23:57,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-07 08:23:57,590 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-11-07 08:23:57,590 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:23:57,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:23:57,591 INFO L85 PathProgramCache]: Analyzing trace with hash -1474937767, now seen corresponding path program 12 times [2021-11-07 08:23:57,591 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:23:57,591 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [51675683] [2021-11-07 08:23:57,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:23:57,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:23:57,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:23:57,984 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:23:57,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:23:57,989 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 114 proven. 85 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-07 08:23:57,989 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:23:57,989 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [51675683] [2021-11-07 08:23:57,989 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [51675683] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:23:57,989 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [8556955] [2021-11-07 08:23:57,989 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-07 08:23:57,990 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:23:57,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:23:57,994 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:23:57,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-07 08:23:59,972 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-11-07 08:23:59,972 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:23:59,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 445 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-07 08:23:59,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:24:00,365 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 [2021-11-07 08:24:01,480 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-07 08:24:01,480 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 [2021-11-07 08:24:01,558 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 31 proven. 189 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 08:24:01,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [8556955] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:24:01,559 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:24:01,559 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 23] total 41 [2021-11-07 08:24:01,559 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778431856] [2021-11-07 08:24:01,559 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-07 08:24:01,559 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:24:01,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-07 08:24:01,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1528, Unknown=0, NotChecked=0, Total=1640 [2021-11-07 08:24:01,560 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) [2021-11-07 08:24:10,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:24:10,143 INFO L93 Difference]: Finished difference Result 4477 states and 4970 transitions. [2021-11-07 08:24:10,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-11-07 08:24:10,150 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 [2021-11-07 08:24:10,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:24:10,173 INFO L225 Difference]: With dead ends: 4477 [2021-11-07 08:24:10,174 INFO L226 Difference]: Without dead ends: 4165 [2021-11-07 08:24:10,175 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2645 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=994, Invalid=10562, Unknown=0, NotChecked=0, Total=11556 [2021-11-07 08:24:10,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4165 states. [2021-11-07 08:24:10,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4165 to 3768. [2021-11-07 08:24:10,226 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) [2021-11-07 08:24:10,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3768 states to 3768 states and 4242 transitions. [2021-11-07 08:24:10,233 INFO L78 Accepts]: Start accepts. Automaton has 3768 states and 4242 transitions. Word has length 112 [2021-11-07 08:24:10,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:24:10,234 INFO L470 AbstractCegarLoop]: Abstraction has 3768 states and 4242 transitions. [2021-11-07 08:24:10,234 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) [2021-11-07 08:24:10,234 INFO L276 IsEmpty]: Start isEmpty. Operand 3768 states and 4242 transitions. [2021-11-07 08:24:10,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-07 08:24:10,242 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:24:10,242 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] [2021-11-07 08:24:10,298 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-07 08:24:10,462 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-11-07 08:24:10,462 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:24:10,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:24:10,463 INFO L85 PathProgramCache]: Analyzing trace with hash -1125472359, now seen corresponding path program 13 times [2021-11-07 08:24:10,463 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:24:10,463 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1993172920] [2021-11-07 08:24:10,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:24:10,463 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:24:10,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:24:10,901 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:24:10,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:24:10,907 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 118 proven. 81 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-07 08:24:10,907 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:24:10,908 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1993172920] [2021-11-07 08:24:10,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1993172920] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:24:10,908 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [112060394] [2021-11-07 08:24:10,908 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 08:24:10,908 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:24:10,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:24:10,909 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:24:10,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-07 08:24:13,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:24:13,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 445 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-07 08:24:13,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:24:13,526 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:24:13,526 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 [2021-11-07 08:24:14,379 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 154 proven. 45 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-07 08:24:14,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [112060394] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:24:14,379 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:24:14,380 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 39 [2021-11-07 08:24:14,380 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119532941] [2021-11-07 08:24:14,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-07 08:24:14,380 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:24:14,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-07 08:24:14,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=1264, Unknown=0, NotChecked=0, Total=1482 [2021-11-07 08:24:14,381 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) [2021-11-07 08:24:15,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:24:15,414 INFO L93 Difference]: Finished difference Result 5041 states and 5607 transitions. [2021-11-07 08:24:15,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-07 08:24:15,414 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 [2021-11-07 08:24:15,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:24:15,426 INFO L225 Difference]: With dead ends: 5041 [2021-11-07 08:24:15,426 INFO L226 Difference]: Without dead ends: 5028 [2021-11-07 08:24:15,427 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 [2021-11-07 08:24:15,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5028 states. [2021-11-07 08:24:15,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5028 to 3768. [2021-11-07 08:24:15,491 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) [2021-11-07 08:24:15,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3768 states to 3768 states and 4242 transitions. [2021-11-07 08:24:15,498 INFO L78 Accepts]: Start accepts. Automaton has 3768 states and 4242 transitions. Word has length 112 [2021-11-07 08:24:15,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:24:15,498 INFO L470 AbstractCegarLoop]: Abstraction has 3768 states and 4242 transitions. [2021-11-07 08:24:15,499 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) [2021-11-07 08:24:15,499 INFO L276 IsEmpty]: Start isEmpty. Operand 3768 states and 4242 transitions. [2021-11-07 08:24:15,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-07 08:24:15,505 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:24:15,505 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] [2021-11-07 08:24:15,553 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-07 08:24:15,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:24:15,718 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:24:15,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:24:15,719 INFO L85 PathProgramCache]: Analyzing trace with hash -317926701, now seen corresponding path program 14 times [2021-11-07 08:24:15,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:24:15,719 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1195554492] [2021-11-07 08:24:15,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:24:15,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:24:15,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:24:16,318 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:24:16,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:24:16,322 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 45 proven. 200 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-07 08:24:16,322 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:24:16,322 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1195554492] [2021-11-07 08:24:16,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1195554492] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:24:16,323 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1929076023] [2021-11-07 08:24:16,323 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 08:24:16,323 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:24:16,323 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:24:16,327 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:24:16,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-07 08:24:18,576 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 08:24:18,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:24:18,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 467 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-07 08:24:18,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:24:18,646 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:24:18,646 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 [2021-11-07 08:24:19,897 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 66 proven. 179 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-07 08:24:19,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1929076023] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:24:19,898 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:24:19,898 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 41 [2021-11-07 08:24:19,898 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822847607] [2021-11-07 08:24:19,898 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-07 08:24:19,899 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:24:19,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-07 08:24:19,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1540, Unknown=0, NotChecked=0, Total=1722 [2021-11-07 08:24:19,900 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) [2021-11-07 08:24:21,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:24:21,818 INFO L93 Difference]: Finished difference Result 4473 states and 4991 transitions. [2021-11-07 08:24:21,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-07 08:24:21,819 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 [2021-11-07 08:24:21,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:24:21,825 INFO L225 Difference]: With dead ends: 4473 [2021-11-07 08:24:21,825 INFO L226 Difference]: Without dead ends: 4471 [2021-11-07 08:24:21,826 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 101 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 836 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=303, Invalid=2453, Unknown=0, NotChecked=0, Total=2756 [2021-11-07 08:24:21,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4471 states. [2021-11-07 08:24:21,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4471 to 3908. [2021-11-07 08:24:21,914 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) [2021-11-07 08:24:21,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3908 states to 3908 states and 4401 transitions. [2021-11-07 08:24:21,921 INFO L78 Accepts]: Start accepts. Automaton has 3908 states and 4401 transitions. Word has length 120 [2021-11-07 08:24:21,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:24:21,922 INFO L470 AbstractCegarLoop]: Abstraction has 3908 states and 4401 transitions. [2021-11-07 08:24:21,922 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) [2021-11-07 08:24:21,922 INFO L276 IsEmpty]: Start isEmpty. Operand 3908 states and 4401 transitions. [2021-11-07 08:24:21,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-07 08:24:21,929 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:24:21,929 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] [2021-11-07 08:24:21,981 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-07 08:24:22,154 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:24:22,154 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:24:22,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:24:22,155 INFO L85 PathProgramCache]: Analyzing trace with hash -1612426510, now seen corresponding path program 11 times [2021-11-07 08:24:22,155 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:24:22,155 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821381716] [2021-11-07 08:24:22,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:24:22,155 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:24:22,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:24:22,725 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:24:22,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:24:22,730 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 61 proven. 243 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:24:22,730 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:24:22,730 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1821381716] [2021-11-07 08:24:22,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1821381716] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:24:22,730 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [252540291] [2021-11-07 08:24:22,730 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 08:24:22,731 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:24:22,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:24:22,732 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:24:22,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-07 08:24:25,063 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-11-07 08:24:25,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:24:25,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 523 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-07 08:24:25,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:24:25,100 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 [2021-11-07 08:24:25,678 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 [2021-11-07 08:24:25,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 08:24:25,717 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 [2021-11-07 08:24:27,370 INFO L354 Elim1Store]: treesize reduction 14, result has 6.7 percent of original size [2021-11-07 08:24:27,371 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 [2021-11-07 08:24:27,400 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 61 proven. 243 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:24:27,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [252540291] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:24:27,401 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:24:27,401 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23] total 33 [2021-11-07 08:24:27,401 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704673400] [2021-11-07 08:24:27,402 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-07 08:24:27,402 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:24:27,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-07 08:24:27,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=978, Unknown=0, NotChecked=0, Total=1056 [2021-11-07 08:24:27,402 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) [2021-11-07 08:24:33,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:24:33,133 INFO L93 Difference]: Finished difference Result 6206 states and 6955 transitions. [2021-11-07 08:24:33,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-07 08:24:33,134 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 [2021-11-07 08:24:33,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:24:33,146 INFO L225 Difference]: With dead ends: 6206 [2021-11-07 08:24:33,147 INFO L226 Difference]: Without dead ends: 5484 [2021-11-07 08:24:33,147 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 114 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=168, Invalid=1812, Unknown=0, NotChecked=0, Total=1980 [2021-11-07 08:24:33,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5484 states. [2021-11-07 08:24:33,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5484 to 4856. [2021-11-07 08:24:33,221 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) [2021-11-07 08:24:33,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4856 states to 4856 states and 5459 transitions. [2021-11-07 08:24:33,229 INFO L78 Accepts]: Start accepts. Automaton has 4856 states and 5459 transitions. Word has length 126 [2021-11-07 08:24:33,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:24:33,230 INFO L470 AbstractCegarLoop]: Abstraction has 4856 states and 5459 transitions. [2021-11-07 08:24:33,230 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) [2021-11-07 08:24:33,230 INFO L276 IsEmpty]: Start isEmpty. Operand 4856 states and 5459 transitions. [2021-11-07 08:24:33,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-07 08:24:33,264 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:24:33,264 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] [2021-11-07 08:24:33,306 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-07 08:24:33,465 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:24:33,465 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:24:33,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:24:33,465 INFO L85 PathProgramCache]: Analyzing trace with hash 426553657, now seen corresponding path program 15 times [2021-11-07 08:24:33,465 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:24:33,465 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251857334] [2021-11-07 08:24:33,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:24:33,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:24:33,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:24:33,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:24:33,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:24:33,817 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 157 proven. 113 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-07 08:24:33,817 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:24:33,817 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251857334] [2021-11-07 08:24:33,818 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1251857334] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:24:33,818 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [130928673] [2021-11-07 08:24:33,818 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 08:24:33,818 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:24:33,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:24:33,819 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:24:33,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-07 08:24:36,182 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-07 08:24:36,182 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:24:36,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-07 08:24:36,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:24:36,592 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 [2021-11-07 08:24:37,892 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-07 08:24:37,893 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 [2021-11-07 08:24:37,980 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 36 proven. 259 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-07 08:24:37,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [130928673] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:24:37,980 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:24:37,980 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 25] total 45 [2021-11-07 08:24:37,980 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597497651] [2021-11-07 08:24:37,980 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-07 08:24:37,981 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:24:37,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-07 08:24:37,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1848, Unknown=0, NotChecked=0, Total=1980 [2021-11-07 08:24:37,981 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) [2021-11-07 08:24:47,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:24:47,819 INFO L93 Difference]: Finished difference Result 7057 states and 7815 transitions. [2021-11-07 08:24:47,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2021-11-07 08:24:47,827 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 [2021-11-07 08:24:47,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:24:47,840 INFO L225 Difference]: With dead ends: 7057 [2021-11-07 08:24:47,841 INFO L226 Difference]: Without dead ends: 6612 [2021-11-07 08:24:47,842 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 [2021-11-07 08:24:47,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6612 states. [2021-11-07 08:24:47,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6612 to 5987. [2021-11-07 08:24:47,934 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) [2021-11-07 08:24:47,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5987 states to 5987 states and 6711 transitions. [2021-11-07 08:24:47,944 INFO L78 Accepts]: Start accepts. Automaton has 5987 states and 6711 transitions. Word has length 127 [2021-11-07 08:24:47,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:24:47,945 INFO L470 AbstractCegarLoop]: Abstraction has 5987 states and 6711 transitions. [2021-11-07 08:24:47,946 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) [2021-11-07 08:24:47,946 INFO L276 IsEmpty]: Start isEmpty. Operand 5987 states and 6711 transitions. [2021-11-07 08:24:47,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-07 08:24:47,956 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:24:47,956 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] [2021-11-07 08:24:48,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-07 08:24:48,178 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:24:48,178 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:24:48,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:24:48,179 INFO L85 PathProgramCache]: Analyzing trace with hash 307297367, now seen corresponding path program 4 times [2021-11-07 08:24:48,179 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:24:48,179 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192388523] [2021-11-07 08:24:48,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:24:48,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:24:48,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:24:48,550 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:24:48,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:24:48,556 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 15 proven. 331 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-07 08:24:48,556 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:24:48,557 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192388523] [2021-11-07 08:24:48,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [192388523] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:24:48,557 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [753909365] [2021-11-07 08:24:48,557 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 08:24:48,557 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:24:48,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:24:48,559 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:24:48,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-07 08:24:51,086 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 08:24:51,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:24:51,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-07 08:24:51,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:24:51,130 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:24:51,131 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 [2021-11-07 08:24:52,033 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 [2021-11-07 08:24:52,099 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-07 08:24:52,099 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 [2021-11-07 08:24:54,608 INFO L354 Elim1Store]: treesize reduction 39, result has 23.5 percent of original size [2021-11-07 08:24:54,608 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 [2021-11-07 08:24:55,047 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 32 proven. 325 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-07 08:24:55,048 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [753909365] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:24:55,048 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:24:55,048 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 24] total 40 [2021-11-07 08:24:55,048 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497448529] [2021-11-07 08:24:55,049 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-07 08:24:55,049 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:24:55,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-07 08:24:55,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-11-07 08:24:55,050 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) [2021-11-07 08:24:59,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:24:59,252 INFO L93 Difference]: Finished difference Result 6545 states and 7301 transitions. [2021-11-07 08:24:59,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-07 08:24:59,253 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 [2021-11-07 08:24:59,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:24:59,263 INFO L225 Difference]: With dead ends: 6545 [2021-11-07 08:24:59,264 INFO L226 Difference]: Without dead ends: 5754 [2021-11-07 08:24:59,264 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1042 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=470, Invalid=4642, Unknown=0, NotChecked=0, Total=5112 [2021-11-07 08:24:59,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5754 states. [2021-11-07 08:24:59,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5754 to 5072. [2021-11-07 08:24:59,340 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) [2021-11-07 08:24:59,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5072 states to 5072 states and 5703 transitions. [2021-11-07 08:24:59,350 INFO L78 Accepts]: Start accepts. Automaton has 5072 states and 5703 transitions. Word has length 130 [2021-11-07 08:24:59,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:24:59,350 INFO L470 AbstractCegarLoop]: Abstraction has 5072 states and 5703 transitions. [2021-11-07 08:24:59,351 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) [2021-11-07 08:24:59,351 INFO L276 IsEmpty]: Start isEmpty. Operand 5072 states and 5703 transitions. [2021-11-07 08:24:59,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-07 08:24:59,357 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:24:59,358 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] [2021-11-07 08:24:59,415 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-07 08:24:59,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-07 08:24:59,574 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:24:59,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:24:59,575 INFO L85 PathProgramCache]: Analyzing trace with hash 679131215, now seen corresponding path program 12 times [2021-11-07 08:24:59,575 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:24:59,575 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1434014205] [2021-11-07 08:24:59,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:24:59,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:24:59,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:25:00,069 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:25:00,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:25:00,075 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 45 proven. 284 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:25:00,075 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:25:00,075 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1434014205] [2021-11-07 08:25:00,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1434014205] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:25:00,075 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1698160947] [2021-11-07 08:25:00,075 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-07 08:25:00,076 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:25:00,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:25:00,082 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:25:00,102 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-07 08:25:03,023 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-11-07 08:25:03,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:25:03,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 534 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-07 08:25:03,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:25:03,875 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 66 proven. 263 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:25:03,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1698160947] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:25:03,875 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:25:03,875 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21] total 40 [2021-11-07 08:25:03,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313337945] [2021-11-07 08:25:03,876 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-07 08:25:03,876 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:25:03,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-07 08:25:03,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1429, Unknown=0, NotChecked=0, Total=1640 [2021-11-07 08:25:03,877 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) [2021-11-07 08:25:06,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:25:06,468 INFO L93 Difference]: Finished difference Result 6395 states and 7151 transitions. [2021-11-07 08:25:06,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-07 08:25:06,469 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 [2021-11-07 08:25:06,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:25:06,482 INFO L225 Difference]: With dead ends: 6395 [2021-11-07 08:25:06,483 INFO L226 Difference]: Without dead ends: 6395 [2021-11-07 08:25:06,483 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 746 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=455, Invalid=2967, Unknown=0, NotChecked=0, Total=3422 [2021-11-07 08:25:06,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6395 states. [2021-11-07 08:25:06,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6395 to 5652. [2021-11-07 08:25:06,567 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) [2021-11-07 08:25:06,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5652 states to 5652 states and 6361 transitions. [2021-11-07 08:25:06,577 INFO L78 Accepts]: Start accepts. Automaton has 5652 states and 6361 transitions. Word has length 130 [2021-11-07 08:25:06,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:25:06,578 INFO L470 AbstractCegarLoop]: Abstraction has 5652 states and 6361 transitions. [2021-11-07 08:25:06,578 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) [2021-11-07 08:25:06,578 INFO L276 IsEmpty]: Start isEmpty. Operand 5652 states and 6361 transitions. [2021-11-07 08:25:06,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-07 08:25:06,585 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:25:06,586 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] [2021-11-07 08:25:06,639 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-07 08:25:06,806 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-07 08:25:06,806 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:25:06,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:25:06,807 INFO L85 PathProgramCache]: Analyzing trace with hash 2081863551, now seen corresponding path program 16 times [2021-11-07 08:25:06,807 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:25:06,807 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421437828] [2021-11-07 08:25:06,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:25:06,807 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:25:06,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:25:07,321 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:25:07,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:25:07,325 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 66 proven. 258 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-07 08:25:07,325 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:25:07,326 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421437828] [2021-11-07 08:25:07,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421437828] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:25:07,326 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1684880655] [2021-11-07 08:25:07,326 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 08:25:07,326 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:25:07,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:25:07,327 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:25:07,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-07 08:25:09,850 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 08:25:09,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:25:09,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 466 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-07 08:25:09,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:25:09,886 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:25:09,886 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 [2021-11-07 08:25:10,450 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 [2021-11-07 08:25:11,549 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 08:25:11,549 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 [2021-11-07 08:25:11,820 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 98 proven. 226 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-07 08:25:11,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1684880655] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:25:11,820 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:25:11,821 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 27] total 42 [2021-11-07 08:25:11,821 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829303945] [2021-11-07 08:25:11,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-07 08:25:11,822 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:25:11,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-07 08:25:11,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=1676, Unknown=0, NotChecked=0, Total=1806 [2021-11-07 08:25:11,823 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) [2021-11-07 08:25:16,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:25:16,404 INFO L93 Difference]: Finished difference Result 7090 states and 7860 transitions. [2021-11-07 08:25:16,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-07 08:25:16,404 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 [2021-11-07 08:25:16,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:25:16,411 INFO L225 Difference]: With dead ends: 7090 [2021-11-07 08:25:16,411 INFO L226 Difference]: Without dead ends: 7088 [2021-11-07 08:25:16,411 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 974 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=425, Invalid=4267, Unknown=0, NotChecked=0, Total=4692 [2021-11-07 08:25:16,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7088 states. [2021-11-07 08:25:16,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7088 to 5820. [2021-11-07 08:25:16,475 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) [2021-11-07 08:25:16,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5820 states to 5820 states and 6552 transitions. [2021-11-07 08:25:16,481 INFO L78 Accepts]: Start accepts. Automaton has 5820 states and 6552 transitions. Word has length 135 [2021-11-07 08:25:16,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:25:16,482 INFO L470 AbstractCegarLoop]: Abstraction has 5820 states and 6552 transitions. [2021-11-07 08:25:16,482 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) [2021-11-07 08:25:16,482 INFO L276 IsEmpty]: Start isEmpty. Operand 5820 states and 6552 transitions. [2021-11-07 08:25:16,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-07 08:25:16,490 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:25:16,490 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] [2021-11-07 08:25:16,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-07 08:25:16,706 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:25:16,706 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:25:16,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:25:16,707 INFO L85 PathProgramCache]: Analyzing trace with hash -1788244024, now seen corresponding path program 13 times [2021-11-07 08:25:16,707 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:25:16,707 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272725445] [2021-11-07 08:25:16,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:25:16,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:25:16,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:25:17,355 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:25:17,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:25:17,359 INFO L134 CoverageAnalysis]: Checked inductivity of 413 backedges. 71 proven. 336 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:25:17,359 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:25:17,359 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272725445] [2021-11-07 08:25:17,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [272725445] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:25:17,359 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784022487] [2021-11-07 08:25:17,359 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 08:25:17,360 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:25:17,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:25:17,361 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:25:17,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-07 08:25:20,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:25:20,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 582 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-07 08:25:20,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:25:20,098 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:25:20,098 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 [2021-11-07 08:25:20,842 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 [2021-11-07 08:25:20,919 INFO L354 Elim1Store]: treesize reduction 44, result has 18.5 percent of original size [2021-11-07 08:25:20,919 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 [2021-11-07 08:25:23,238 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-07 08:25:23,239 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 [2021-11-07 08:25:26,160 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-07 08:25:26,161 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 [2021-11-07 08:25:26,184 INFO L134 CoverageAnalysis]: Checked inductivity of 413 backedges. 71 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:25:26,184 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [784022487] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:25:26,184 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:25:26,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 31] total 52 [2021-11-07 08:25:26,185 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517478039] [2021-11-07 08:25:26,185 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-07 08:25:26,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:25:26,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-07 08:25:26,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=2529, Unknown=1, NotChecked=0, Total=2652 [2021-11-07 08:25:26,186 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) [2021-11-07 08:25:56,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:25:56,503 INFO L93 Difference]: Finished difference Result 9413 states and 10549 transitions. [2021-11-07 08:25:56,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-07 08:25:56,504 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 [2021-11-07 08:25:56,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:25:56,510 INFO L225 Difference]: With dead ends: 9413 [2021-11-07 08:25:56,510 INFO L226 Difference]: Without dead ends: 8203 [2021-11-07 08:25:56,511 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1483 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=455, Invalid=7916, Unknown=1, NotChecked=0, Total=8372 [2021-11-07 08:25:56,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8203 states. [2021-11-07 08:25:56,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8203 to 7302. [2021-11-07 08:25:56,582 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) [2021-11-07 08:25:56,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7302 states to 7302 states and 8205 transitions. [2021-11-07 08:25:56,592 INFO L78 Accepts]: Start accepts. Automaton has 7302 states and 8205 transitions. Word has length 141 [2021-11-07 08:25:56,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:25:56,592 INFO L470 AbstractCegarLoop]: Abstraction has 7302 states and 8205 transitions. [2021-11-07 08:25:56,592 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) [2021-11-07 08:25:56,592 INFO L276 IsEmpty]: Start isEmpty. Operand 7302 states and 8205 transitions. [2021-11-07 08:25:56,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-07 08:25:56,602 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:25:56,602 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] [2021-11-07 08:25:56,641 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-07 08:25:56,818 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:25:56,818 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:25:56,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:25:56,819 INFO L85 PathProgramCache]: Analyzing trace with hash -1786481907, now seen corresponding path program 17 times [2021-11-07 08:25:56,819 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:25:56,819 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [867254422] [2021-11-07 08:25:56,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:25:56,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:25:56,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:25:57,440 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:25:57,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:25:57,444 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 207 proven. 145 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-07 08:25:57,444 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:25:57,444 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [867254422] [2021-11-07 08:25:57,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [867254422] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:25:57,445 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1385295877] [2021-11-07 08:25:57,445 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 08:25:57,445 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:25:57,445 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:25:57,446 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:25:57,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-07 08:26:00,646 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-07 08:26:00,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:26:00,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 549 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-07 08:26:00,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:26:00,682 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-07 08:26:00,682 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 [2021-11-07 08:26:00,685 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 [2021-11-07 08:26:02,154 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 261 proven. 91 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-07 08:26:02,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1385295877] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:26:02,155 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:26:02,155 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22] total 44 [2021-11-07 08:26:02,156 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565408411] [2021-11-07 08:26:02,156 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-07 08:26:02,157 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:26:02,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-07 08:26:02,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=283, Invalid=1609, Unknown=0, NotChecked=0, Total=1892 [2021-11-07 08:26:02,158 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) [2021-11-07 08:26:04,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:26:04,234 INFO L93 Difference]: Finished difference Result 8116 states and 8926 transitions. [2021-11-07 08:26:04,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-07 08:26:04,235 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 [2021-11-07 08:26:04,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:26:04,242 INFO L225 Difference]: With dead ends: 8116 [2021-11-07 08:26:04,242 INFO L226 Difference]: Without dead ends: 7441 [2021-11-07 08:26:04,243 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 917 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=774, Invalid=3918, Unknown=0, NotChecked=0, Total=4692 [2021-11-07 08:26:04,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7441 states. [2021-11-07 08:26:04,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7441 to 6555. [2021-11-07 08:26:04,340 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) [2021-11-07 08:26:04,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6555 states to 6555 states and 7297 transitions. [2021-11-07 08:26:04,349 INFO L78 Accepts]: Start accepts. Automaton has 6555 states and 7297 transitions. Word has length 142 [2021-11-07 08:26:04,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:26:04,349 INFO L470 AbstractCegarLoop]: Abstraction has 6555 states and 7297 transitions. [2021-11-07 08:26:04,349 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) [2021-11-07 08:26:04,349 INFO L276 IsEmpty]: Start isEmpty. Operand 6555 states and 7297 transitions. [2021-11-07 08:26:04,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-07 08:26:04,359 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:26:04,359 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] [2021-11-07 08:26:04,402 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-07 08:26:04,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable62 [2021-11-07 08:26:04,574 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:26:04,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:26:04,575 INFO L85 PathProgramCache]: Analyzing trace with hash 748471727, now seen corresponding path program 5 times [2021-11-07 08:26:04,575 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:26:04,576 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337907867] [2021-11-07 08:26:04,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:26:04,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:26:04,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:26:05,085 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:26:05,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:26:05,090 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 28 proven. 425 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-07 08:26:05,090 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:26:05,090 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337907867] [2021-11-07 08:26:05,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1337907867] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:26:05,091 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149851156] [2021-11-07 08:26:05,091 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 08:26:05,091 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:26:05,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:26:05,095 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:26:05,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-07 08:26:08,930 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-07 08:26:08,930 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:26:08,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 606 conjuncts, 133 conjunts are in the unsatisfiable core [2021-11-07 08:26:08,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:26:08,981 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:26:08,981 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 9 treesize of output 15 [2021-11-07 08:26:12,458 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-07 08:26:12,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 08:26:12,465 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-07 08:26:12,466 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 [2021-11-07 08:26:13,119 INFO L134 CoverageAnalysis]: Checked inductivity of 487 backedges. 45 proven. 429 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-07 08:26:13,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1149851156] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:26:13,120 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:26:13,120 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 31] total 49 [2021-11-07 08:26:13,120 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978298345] [2021-11-07 08:26:13,121 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-07 08:26:13,121 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:26:13,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-07 08:26:13,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=2280, Unknown=0, NotChecked=0, Total=2450 [2021-11-07 08:26:13,123 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) [2021-11-07 08:26:19,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:26:19,998 INFO L93 Difference]: Finished difference Result 10652 states and 11752 transitions. [2021-11-07 08:26:19,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-07 08:26:19,999 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 [2021-11-07 08:26:19,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:26:20,007 INFO L225 Difference]: With dead ends: 10652 [2021-11-07 08:26:20,007 INFO L226 Difference]: Without dead ends: 8831 [2021-11-07 08:26:20,008 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1967 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=547, Invalid=6763, Unknown=0, NotChecked=0, Total=7310 [2021-11-07 08:26:20,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8831 states. [2021-11-07 08:26:20,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8831 to 5388. [2021-11-07 08:26:20,080 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) [2021-11-07 08:26:20,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5388 states to 5388 states and 6015 transitions. [2021-11-07 08:26:20,089 INFO L78 Accepts]: Start accepts. Automaton has 5388 states and 6015 transitions. Word has length 145 [2021-11-07 08:26:20,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:26:20,090 INFO L470 AbstractCegarLoop]: Abstraction has 5388 states and 6015 transitions. [2021-11-07 08:26:20,090 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) [2021-11-07 08:26:20,091 INFO L276 IsEmpty]: Start isEmpty. Operand 5388 states and 6015 transitions. [2021-11-07 08:26:20,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-07 08:26:20,097 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:26:20,097 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] [2021-11-07 08:26:20,151 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-07 08:26:20,310 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:26:20,310 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:26:20,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:26:20,311 INFO L85 PathProgramCache]: Analyzing trace with hash -1936055093, now seen corresponding path program 14 times [2021-11-07 08:26:20,311 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:26:20,311 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949047925] [2021-11-07 08:26:20,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:26:20,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:26:20,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:26:20,968 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:26:20,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:26:20,972 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 66 proven. 370 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:26:20,972 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:26:20,973 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949047925] [2021-11-07 08:26:20,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1949047925] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:26:20,973 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1920741146] [2021-11-07 08:26:20,973 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 08:26:20,973 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:26:20,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:26:20,974 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:26:20,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-07 08:26:24,449 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 08:26:24,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:26:24,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 593 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-07 08:26:24,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:26:25,605 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 91 proven. 345 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:26:25,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1920741146] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:26:25,605 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:26:25,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 35 [2021-11-07 08:26:25,605 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647682646] [2021-11-07 08:26:25,606 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-07 08:26:25,606 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:26:25,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-07 08:26:25,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1100, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 08:26:25,607 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) [2021-11-07 08:26:27,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:26:27,931 INFO L93 Difference]: Finished difference Result 6607 states and 7363 transitions. [2021-11-07 08:26:27,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-07 08:26:27,932 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 [2021-11-07 08:26:27,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:26:27,937 INFO L225 Difference]: With dead ends: 6607 [2021-11-07 08:26:27,937 INFO L226 Difference]: Without dead ends: 6607 [2021-11-07 08:26:27,938 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 132 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 511 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=271, Invalid=1985, Unknown=0, NotChecked=0, Total=2256 [2021-11-07 08:26:27,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6607 states. [2021-11-07 08:26:28,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6607 to 5982. [2021-11-07 08:26:28,054 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) [2021-11-07 08:26:28,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5982 states to 5982 states and 6689 transitions. [2021-11-07 08:26:28,065 INFO L78 Accepts]: Start accepts. Automaton has 5982 states and 6689 transitions. Word has length 145 [2021-11-07 08:26:28,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:26:28,066 INFO L470 AbstractCegarLoop]: Abstraction has 5982 states and 6689 transitions. [2021-11-07 08:26:28,066 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) [2021-11-07 08:26:28,066 INFO L276 IsEmpty]: Start isEmpty. Operand 5982 states and 6689 transitions. [2021-11-07 08:26:28,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-07 08:26:28,070 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:26:28,070 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] [2021-11-07 08:26:28,109 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-07 08:26:28,271 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:26:28,271 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:26:28,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:26:28,271 INFO L85 PathProgramCache]: Analyzing trace with hash -2073657750, now seen corresponding path program 18 times [2021-11-07 08:26:28,272 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:26:28,272 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1482023278] [2021-11-07 08:26:28,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:26:28,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:26:28,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:26:31,164 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:26:31,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:26:31,169 INFO L134 CoverageAnalysis]: Checked inductivity of 501 backedges. 41 proven. 460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:26:31,169 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:26:31,170 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1482023278] [2021-11-07 08:26:31,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1482023278] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:26:31,170 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990158347] [2021-11-07 08:26:31,170 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-07 08:26:31,170 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:26:31,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:26:31,171 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:26:31,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-07 08:26:36,040 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-11-07 08:26:36,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:26:36,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 560 conjuncts, 70 conjunts are in the unsatisfiable core [2021-11-07 08:26:36,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:26:36,900 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 [2021-11-07 08:26:37,695 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 [2021-11-07 08:26:37,713 INFO L134 CoverageAnalysis]: Checked inductivity of 501 backedges. 41 proven. 340 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-07 08:26:37,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1990158347] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:26:37,713 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:26:37,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 27] total 55 [2021-11-07 08:26:37,714 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620457920] [2021-11-07 08:26:37,714 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-07 08:26:37,715 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:26:37,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-07 08:26:37,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=2839, Unknown=0, NotChecked=0, Total=2970 [2021-11-07 08:26:37,716 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) [2021-11-07 08:26:52,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:26:52,287 INFO L93 Difference]: Finished difference Result 9729 states and 10754 transitions. [2021-11-07 08:26:52,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-11-07 08:26:52,288 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 [2021-11-07 08:26:52,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:26:52,297 INFO L225 Difference]: With dead ends: 9729 [2021-11-07 08:26:52,297 INFO L226 Difference]: Without dead ends: 9627 [2021-11-07 08:26:52,298 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2221 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=682, Invalid=12658, Unknown=0, NotChecked=0, Total=13340 [2021-11-07 08:26:52,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9627 states. [2021-11-07 08:26:52,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9627 to 7065. [2021-11-07 08:26:52,420 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) [2021-11-07 08:26:52,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7065 states to 7065 states and 7904 transitions. [2021-11-07 08:26:52,430 INFO L78 Accepts]: Start accepts. Automaton has 7065 states and 7904 transitions. Word has length 146 [2021-11-07 08:26:52,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:26:52,430 INFO L470 AbstractCegarLoop]: Abstraction has 7065 states and 7904 transitions. [2021-11-07 08:26:52,430 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) [2021-11-07 08:26:52,430 INFO L276 IsEmpty]: Start isEmpty. Operand 7065 states and 7904 transitions. [2021-11-07 08:26:52,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-11-07 08:26:52,436 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:26:52,436 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] [2021-11-07 08:26:52,476 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-07 08:26:52,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable65 [2021-11-07 08:26:52,638 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:26:52,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:26:52,639 INFO L85 PathProgramCache]: Analyzing trace with hash -1471105017, now seen corresponding path program 19 times [2021-11-07 08:26:52,639 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:26:52,639 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [303884377] [2021-11-07 08:26:52,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:26:52,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:26:52,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:26:53,386 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:26:53,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:26:53,389 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 91 proven. 323 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-07 08:26:53,390 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:26:53,390 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [303884377] [2021-11-07 08:26:53,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [303884377] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:26:53,390 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1699826345] [2021-11-07 08:26:53,390 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 08:26:53,390 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:26:53,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:26:53,391 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:26:53,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-07 08:26:57,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:26:57,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-07 08:26:57,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:26:58,631 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 120 proven. 294 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-07 08:26:58,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1699826345] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:26:58,632 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:26:58,632 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 41 [2021-11-07 08:26:58,632 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675640492] [2021-11-07 08:26:58,633 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-07 08:26:58,633 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:26:58,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-07 08:26:58,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=1513, Unknown=0, NotChecked=0, Total=1722 [2021-11-07 08:26:58,634 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) [2021-11-07 08:27:01,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:27:01,677 INFO L93 Difference]: Finished difference Result 8342 states and 9259 transitions. [2021-11-07 08:27:01,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-07 08:27:01,678 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 [2021-11-07 08:27:01,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:27:01,684 INFO L225 Difference]: With dead ends: 8342 [2021-11-07 08:27:01,684 INFO L226 Difference]: Without dead ends: 8340 [2021-11-07 08:27:01,685 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 135 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 820 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=348, Invalid=2622, Unknown=0, NotChecked=0, Total=2970 [2021-11-07 08:27:01,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8340 states. [2021-11-07 08:27:01,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8340 to 7184. [2021-11-07 08:27:01,774 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) [2021-11-07 08:27:01,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7184 states to 7184 states and 8040 transitions. [2021-11-07 08:27:01,788 INFO L78 Accepts]: Start accepts. Automaton has 7184 states and 8040 transitions. Word has length 150 [2021-11-07 08:27:01,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:27:01,789 INFO L470 AbstractCegarLoop]: Abstraction has 7184 states and 8040 transitions. [2021-11-07 08:27:01,789 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) [2021-11-07 08:27:01,789 INFO L276 IsEmpty]: Start isEmpty. Operand 7184 states and 8040 transitions. [2021-11-07 08:27:01,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-07 08:27:01,798 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:27:01,798 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] [2021-11-07 08:27:01,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-07 08:27:02,014 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-11-07 08:27:02,014 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:27:02,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:27:02,015 INFO L85 PathProgramCache]: Analyzing trace with hash 1673182668, now seen corresponding path program 15 times [2021-11-07 08:27:02,015 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:27:02,015 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252344196] [2021-11-07 08:27:02,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:27:02,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:27:02,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:27:02,798 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:27:02,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:27:02,801 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 81 proven. 444 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:27:02,802 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:27:02,802 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252344196] [2021-11-07 08:27:02,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [252344196] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:27:02,802 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [280624829] [2021-11-07 08:27:02,802 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 08:27:02,802 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:27:02,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:27:02,803 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:27:02,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-07 08:27:07,186 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-07 08:27:07,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:27:07,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 641 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-07 08:27:07,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:27:07,243 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 [2021-11-07 08:27:08,021 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 [2021-11-07 08:27:08,112 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-07 08:27:08,112 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 [2021-11-07 08:27:11,530 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-07 08:27:11,530 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 [2021-11-07 08:27:11,558 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 81 proven. 444 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:27:11,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [280624829] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:27:11,558 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:27:11,558 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 49 [2021-11-07 08:27:11,559 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910541168] [2021-11-07 08:27:11,559 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-07 08:27:11,559 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:27:11,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-07 08:27:11,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=2234, Unknown=0, NotChecked=0, Total=2352 [2021-11-07 08:27:11,560 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) [2021-11-07 08:27:53,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:27:53,662 INFO L93 Difference]: Finished difference Result 12333 states and 13778 transitions. [2021-11-07 08:27:53,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 08:27:53,662 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 [2021-11-07 08:27:53,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:27:53,671 INFO L225 Difference]: With dead ends: 12333 [2021-11-07 08:27:53,671 INFO L226 Difference]: Without dead ends: 10473 [2021-11-07 08:27:53,672 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 135 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 479 ImplicationChecksByTransitivity, 38.8s TimeCoverageRelationStatistics Valid=239, Invalid=3793, Unknown=0, NotChecked=0, Total=4032 [2021-11-07 08:27:53,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10473 states. [2021-11-07 08:27:53,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10473 to 9919. [2021-11-07 08:27:53,774 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) [2021-11-07 08:27:53,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9919 states to 9919 states and 11113 transitions. [2021-11-07 08:27:53,792 INFO L78 Accepts]: Start accepts. Automaton has 9919 states and 11113 transitions. Word has length 156 [2021-11-07 08:27:53,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:27:53,792 INFO L470 AbstractCegarLoop]: Abstraction has 9919 states and 11113 transitions. [2021-11-07 08:27:53,793 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) [2021-11-07 08:27:53,793 INFO L276 IsEmpty]: Start isEmpty. Operand 9919 states and 11113 transitions. [2021-11-07 08:27:53,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-07 08:27:53,803 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:27:53,804 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] [2021-11-07 08:27:53,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-07 08:27:54,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-11-07 08:27:54,019 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:27:54,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:27:54,019 INFO L85 PathProgramCache]: Analyzing trace with hash 1135233413, now seen corresponding path program 20 times [2021-11-07 08:27:54,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:27:54,020 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971645227] [2021-11-07 08:27:54,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:27:54,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:27:54,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:27:54,732 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:27:54,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:27:54,737 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 264 proven. 181 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-07 08:27:54,737 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:27:54,737 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971645227] [2021-11-07 08:27:54,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1971645227] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:27:54,738 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [93608201] [2021-11-07 08:27:54,738 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 08:27:54,738 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:27:54,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:27:54,739 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:27:54,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-07 08:27:59,034 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 08:27:59,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:27:59,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 601 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-07 08:27:59,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:27:59,089 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-07 08:27:59,090 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 [2021-11-07 08:27:59,094 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 [2021-11-07 08:28:00,815 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 325 proven. 120 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-07 08:28:00,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [93608201] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:28:00,816 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:28:00,816 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 49 [2021-11-07 08:28:00,816 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950976248] [2021-11-07 08:28:00,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-07 08:28:00,816 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:28:00,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-07 08:28:00,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=1997, Unknown=0, NotChecked=0, Total=2352 [2021-11-07 08:28:00,818 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) [2021-11-07 08:28:02,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:28:02,977 INFO L93 Difference]: Finished difference Result 11150 states and 12264 transitions. [2021-11-07 08:28:02,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-07 08:28:02,977 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 [2021-11-07 08:28:02,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:28:02,986 INFO L225 Difference]: With dead ends: 11150 [2021-11-07 08:28:02,986 INFO L226 Difference]: Without dead ends: 10419 [2021-11-07 08:28:02,986 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1142 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=967, Invalid=4733, Unknown=0, NotChecked=0, Total=5700 [2021-11-07 08:28:02,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10419 states. [2021-11-07 08:28:03,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10419 to 9158. [2021-11-07 08:28:03,082 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) [2021-11-07 08:28:03,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9158 states to 9158 states and 10194 transitions. [2021-11-07 08:28:03,093 INFO L78 Accepts]: Start accepts. Automaton has 9158 states and 10194 transitions. Word has length 157 [2021-11-07 08:28:03,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:28:03,093 INFO L470 AbstractCegarLoop]: Abstraction has 9158 states and 10194 transitions. [2021-11-07 08:28:03,094 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) [2021-11-07 08:28:03,094 INFO L276 IsEmpty]: Start isEmpty. Operand 9158 states and 10194 transitions. [2021-11-07 08:28:03,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-07 08:28:03,099 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:28:03,100 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] [2021-11-07 08:28:03,143 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-07 08:28:03,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-11-07 08:28:03,303 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:28:03,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:28:03,303 INFO L85 PathProgramCache]: Analyzing trace with hash -1318903191, now seen corresponding path program 16 times [2021-11-07 08:28:03,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:28:03,303 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549890164] [2021-11-07 08:28:03,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:28:03,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:28:03,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:28:03,970 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:28:03,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:28:03,973 INFO L134 CoverageAnalysis]: Checked inductivity of 564 backedges. 91 proven. 467 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:28:03,973 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:28:03,974 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549890164] [2021-11-07 08:28:03,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549890164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:28:03,974 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [920945360] [2021-11-07 08:28:03,974 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 08:28:03,974 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:28:03,974 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:28:03,979 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:28:03,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-07 08:28:08,448 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 08:28:08,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:28:08,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 611 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-07 08:28:08,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:28:08,486 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 [2021-11-07 08:28:08,493 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 [2021-11-07 08:28:09,890 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 [2021-11-07 08:28:09,972 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-07 08:28:09,972 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 [2021-11-07 08:28:13,596 INFO L354 Elim1Store]: treesize reduction 39, result has 23.5 percent of original size [2021-11-07 08:28:13,596 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 [2021-11-07 08:28:13,989 INFO L134 CoverageAnalysis]: Checked inductivity of 564 backedges. 128 proven. 430 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:28:13,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [920945360] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:28:13,990 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:28:13,990 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 27] total 50 [2021-11-07 08:28:13,990 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671490063] [2021-11-07 08:28:13,991 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-07 08:28:13,991 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:28:13,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-07 08:28:13,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=2347, Unknown=0, NotChecked=0, Total=2550 [2021-11-07 08:28:13,991 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) [2021-11-07 08:28:24,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:28:24,838 INFO L93 Difference]: Finished difference Result 10765 states and 11969 transitions. [2021-11-07 08:28:24,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-07 08:28:24,839 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 [2021-11-07 08:28:24,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:28:24,848 INFO L225 Difference]: With dead ends: 10765 [2021-11-07 08:28:24,848 INFO L226 Difference]: Without dead ends: 10765 [2021-11-07 08:28:24,848 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1161 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=543, Invalid=5777, Unknown=0, NotChecked=0, Total=6320 [2021-11-07 08:28:24,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10765 states. [2021-11-07 08:28:24,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10765 to 9902. [2021-11-07 08:28:24,961 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) [2021-11-07 08:28:24,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9902 states to 9902 states and 11037 transitions. [2021-11-07 08:28:24,975 INFO L78 Accepts]: Start accepts. Automaton has 9902 states and 11037 transitions. Word has length 160 [2021-11-07 08:28:24,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:28:24,975 INFO L470 AbstractCegarLoop]: Abstraction has 9902 states and 11037 transitions. [2021-11-07 08:28:24,976 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) [2021-11-07 08:28:24,976 INFO L276 IsEmpty]: Start isEmpty. Operand 9902 states and 11037 transitions. [2021-11-07 08:28:24,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-07 08:28:24,983 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:28:24,983 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] [2021-11-07 08:28:25,029 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2021-11-07 08:28:25,198 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2021-11-07 08:28:25,198 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:28:25,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:28:25,199 INFO L85 PathProgramCache]: Analyzing trace with hash -1425115000, now seen corresponding path program 21 times [2021-11-07 08:28:25,199 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:28:25,199 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1125108191] [2021-11-07 08:28:25,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:28:25,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:28:25,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:28:28,653 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:28:28,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:28:28,657 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 46 proven. 585 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:28:28,658 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:28:28,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1125108191] [2021-11-07 08:28:28,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1125108191] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:28:28,659 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [867753011] [2021-11-07 08:28:28,659 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 08:28:28,659 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:28:28,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:28:28,687 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:28:28,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-07 08:28:34,782 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-07 08:28:34,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:28:34,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 612 conjuncts, 119 conjunts are in the unsatisfiable core [2021-11-07 08:28:34,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:28:34,828 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 [2021-11-07 08:28:34,835 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 [2021-11-07 08:28:39,146 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 [2021-11-07 08:28:39,151 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 [2021-11-07 08:28:39,332 INFO L354 Elim1Store]: treesize reduction 38, result has 20.8 percent of original size [2021-11-07 08:28:39,332 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 [2021-11-07 08:28:46,164 INFO L354 Elim1Store]: treesize reduction 55, result has 32.1 percent of original size [2021-11-07 08:28:46,164 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 [2021-11-07 08:28:46,264 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 10 proven. 621 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:28:46,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [867753011] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:28:46,264 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:28:46,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 47] total 87 [2021-11-07 08:28:46,264 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427899065] [2021-11-07 08:28:46,265 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-07 08:28:46,265 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:28:46,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-07 08:28:46,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=7222, Unknown=0, NotChecked=0, Total=7482 [2021-11-07 08:28:46,266 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) [2021-11-07 08:29:08,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:29:08,258 INFO L93 Difference]: Finished difference Result 11946 states and 13263 transitions. [2021-11-07 08:29:08,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-11-07 08:29:08,259 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 [2021-11-07 08:29:08,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:29:08,267 INFO L225 Difference]: With dead ends: 11946 [2021-11-07 08:29:08,268 INFO L226 Difference]: Without dead ends: 11889 [2021-11-07 08:29:08,269 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4603 ImplicationChecksByTransitivity, 15.3s TimeCoverageRelationStatistics Valid=933, Invalid=20237, Unknown=0, NotChecked=0, Total=21170 [2021-11-07 08:29:08,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11889 states. [2021-11-07 08:29:08,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11889 to 11292. [2021-11-07 08:29:08,409 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) [2021-11-07 08:29:08,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11292 states to 11292 states and 12603 transitions. [2021-11-07 08:29:08,422 INFO L78 Accepts]: Start accepts. Automaton has 11292 states and 12603 transitions. Word has length 161 [2021-11-07 08:29:08,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:29:08,423 INFO L470 AbstractCegarLoop]: Abstraction has 11292 states and 12603 transitions. [2021-11-07 08:29:08,423 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) [2021-11-07 08:29:08,423 INFO L276 IsEmpty]: Start isEmpty. Operand 11292 states and 12603 transitions. [2021-11-07 08:29:08,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2021-11-07 08:29:08,428 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:29:08,428 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] [2021-11-07 08:29:08,471 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2021-11-07 08:29:08,629 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:29:08,629 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:29:08,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:29:08,630 INFO L85 PathProgramCache]: Analyzing trace with hash 1529073995, now seen corresponding path program 22 times [2021-11-07 08:29:08,630 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:29:08,630 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [720281928] [2021-11-07 08:29:08,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:29:08,630 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:29:08,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:29:09,630 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:29:09,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:29:09,636 INFO L134 CoverageAnalysis]: Checked inductivity of 668 backedges. 120 proven. 395 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-07 08:29:09,636 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:29:09,637 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [720281928] [2021-11-07 08:29:09,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [720281928] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:29:09,637 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1413885688] [2021-11-07 08:29:09,637 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 08:29:09,638 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:29:09,638 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:29:09,643 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:29:09,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-07 08:29:14,908 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 08:29:14,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:29:14,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 558 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-07 08:29:14,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:29:14,961 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:29:14,961 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 [2021-11-07 08:29:15,841 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 [2021-11-07 08:29:17,599 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 08:29:17,600 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 [2021-11-07 08:29:17,983 INFO L134 CoverageAnalysis]: Checked inductivity of 668 backedges. 162 proven. 353 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-07 08:29:17,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1413885688] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:29:17,983 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:29:17,983 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 31] total 48 [2021-11-07 08:29:17,984 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478927452] [2021-11-07 08:29:17,984 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-07 08:29:17,984 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:29:17,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-07 08:29:17,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2191, Unknown=0, NotChecked=0, Total=2352 [2021-11-07 08:29:17,985 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) [2021-11-07 08:29:27,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:29:27,784 INFO L93 Difference]: Finished difference Result 17234 states and 19084 transitions. [2021-11-07 08:29:27,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-07 08:29:27,785 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 [2021-11-07 08:29:27,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:29:27,803 INFO L225 Difference]: With dead ends: 17234 [2021-11-07 08:29:27,804 INFO L226 Difference]: Without dead ends: 17230 [2021-11-07 08:29:27,804 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1493 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=569, Invalid=6403, Unknown=0, NotChecked=0, Total=6972 [2021-11-07 08:29:27,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17230 states. [2021-11-07 08:29:27,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17230 to 11425. [2021-11-07 08:29:27,996 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) [2021-11-07 08:29:28,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11425 states to 11425 states and 12755 transitions. [2021-11-07 08:29:28,010 INFO L78 Accepts]: Start accepts. Automaton has 11425 states and 12755 transitions. Word has length 165 [2021-11-07 08:29:28,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:29:28,010 INFO L470 AbstractCegarLoop]: Abstraction has 11425 states and 12755 transitions. [2021-11-07 08:29:28,010 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) [2021-11-07 08:29:28,010 INFO L276 IsEmpty]: Start isEmpty. Operand 11425 states and 12755 transitions. [2021-11-07 08:29:28,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-11-07 08:29:28,016 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:29:28,016 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] [2021-11-07 08:29:28,059 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-07 08:29:28,218 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable71 [2021-11-07 08:29:28,218 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:29:28,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:29:28,219 INFO L85 PathProgramCache]: Analyzing trace with hash 334833255, now seen corresponding path program 6 times [2021-11-07 08:29:28,219 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:29:28,219 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409615315] [2021-11-07 08:29:28,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:29:28,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:29:28,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:29:28,798 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:29:28,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:29:28,802 INFO L134 CoverageAnalysis]: Checked inductivity of 691 backedges. 45 proven. 605 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-07 08:29:28,802 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:29:28,802 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409615315] [2021-11-07 08:29:28,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [409615315] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:29:28,802 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [913269885] [2021-11-07 08:29:28,803 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-07 08:29:28,803 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:29:28,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:29:28,804 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:29:28,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-07 08:29:34,651 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2021-11-07 08:29:34,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:29:34,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 695 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-07 08:29:34,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:29:36,393 INFO L134 CoverageAnalysis]: Checked inductivity of 691 backedges. 66 proven. 584 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-07 08:29:36,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [913269885] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:29:36,394 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:29:36,394 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 22] total 34 [2021-11-07 08:29:36,394 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384987194] [2021-11-07 08:29:36,394 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-07 08:29:36,395 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:29:36,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-07 08:29:36,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1076, Unknown=0, NotChecked=0, Total=1190 [2021-11-07 08:29:36,396 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) [2021-11-07 08:29:41,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:29:41,045 INFO L93 Difference]: Finished difference Result 12771 states and 14080 transitions. [2021-11-07 08:29:41,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-07 08:29:41,045 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 [2021-11-07 08:29:41,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:29:41,056 INFO L225 Difference]: With dead ends: 12771 [2021-11-07 08:29:41,056 INFO L226 Difference]: Without dead ends: 11207 [2021-11-07 08:29:41,057 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 154 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 906 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=577, Invalid=4115, Unknown=0, NotChecked=0, Total=4692 [2021-11-07 08:29:41,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11207 states. [2021-11-07 08:29:41,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11207 to 9980. [2021-11-07 08:29:41,163 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) [2021-11-07 08:29:41,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9980 states to 9980 states and 11168 transitions. [2021-11-07 08:29:41,178 INFO L78 Accepts]: Start accepts. Automaton has 9980 states and 11168 transitions. Word has length 167 [2021-11-07 08:29:41,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:29:41,178 INFO L470 AbstractCegarLoop]: Abstraction has 9980 states and 11168 transitions. [2021-11-07 08:29:41,178 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) [2021-11-07 08:29:41,179 INFO L276 IsEmpty]: Start isEmpty. Operand 9980 states and 11168 transitions. [2021-11-07 08:29:41,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2021-11-07 08:29:41,184 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:29:41,185 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] [2021-11-07 08:29:41,242 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-07 08:29:41,398 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:29:41,399 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:29:41,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:29:41,399 INFO L85 PathProgramCache]: Analyzing trace with hash 1107669358, now seen corresponding path program 17 times [2021-11-07 08:29:41,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:29:41,399 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328168926] [2021-11-07 08:29:41,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:29:41,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:29:41,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:29:42,552 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:29:42,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:29:42,557 INFO L134 CoverageAnalysis]: Checked inductivity of 664 backedges. 91 proven. 567 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 08:29:42,557 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:29:42,557 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328168926] [2021-11-07 08:29:42,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1328168926] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:29:42,558 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [735403857] [2021-11-07 08:29:42,558 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 08:29:42,559 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:29:42,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:29:42,563 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:29:42,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-07 08:29:48,553 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2021-11-07 08:29:48,554 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:29:48,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 700 conjuncts, 89 conjunts are in the unsatisfiable core [2021-11-07 08:29:48,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:29:48,611 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:29:48,612 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 [2021-11-07 08:29:50,721 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 [2021-11-07 08:29:50,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 08:29:50,832 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 [2021-11-07 08:29:55,157 INFO L354 Elim1Store]: treesize reduction 43, result has 18.9 percent of original size [2021-11-07 08:29:55,157 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 [2021-11-07 08:29:55,678 INFO L134 CoverageAnalysis]: Checked inductivity of 664 backedges. 105 proven. 559 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:29:55,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [735403857] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:29:55,678 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:29:55,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 33] total 60 [2021-11-07 08:29:55,679 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282917535] [2021-11-07 08:29:55,680 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-07 08:29:55,680 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:29:55,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-07 08:29:55,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=3374, Unknown=0, NotChecked=0, Total=3540 [2021-11-07 08:29:55,681 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) [2021-11-07 08:30:11,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:30:11,830 INFO L93 Difference]: Finished difference Result 15809 states and 17647 transitions. [2021-11-07 08:30:11,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-11-07 08:30:11,831 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 [2021-11-07 08:30:11,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:30:11,842 INFO L225 Difference]: With dead ends: 15809 [2021-11-07 08:30:11,842 INFO L226 Difference]: Without dead ends: 13116 [2021-11-07 08:30:11,843 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 141 SyntacticMatches, 1 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3518 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=966, Invalid=16326, Unknown=0, NotChecked=0, Total=17292 [2021-11-07 08:30:11,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13116 states. [2021-11-07 08:30:11,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13116 to 12394. [2021-11-07 08:30:11,973 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) [2021-11-07 08:30:11,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12394 states to 12394 states and 13868 transitions. [2021-11-07 08:30:11,991 INFO L78 Accepts]: Start accepts. Automaton has 12394 states and 13868 transitions. Word has length 171 [2021-11-07 08:30:11,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:30:11,991 INFO L470 AbstractCegarLoop]: Abstraction has 12394 states and 13868 transitions. [2021-11-07 08:30:11,991 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) [2021-11-07 08:30:11,992 INFO L276 IsEmpty]: Start isEmpty. Operand 12394 states and 13868 transitions. [2021-11-07 08:30:11,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-11-07 08:30:11,998 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:30:11,998 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] [2021-11-07 08:30:12,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-07 08:30:12,199 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:30:12,199 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:30:12,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:30:12,199 INFO L85 PathProgramCache]: Analyzing trace with hash -492241983, now seen corresponding path program 23 times [2021-11-07 08:30:12,200 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:30:12,200 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706515096] [2021-11-07 08:30:12,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:30:12,200 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:30:12,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:30:12,999 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:30:13,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:30:13,003 INFO L134 CoverageAnalysis]: Checked inductivity of 739 backedges. 328 proven. 221 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-07 08:30:13,004 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:30:13,004 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [706515096] [2021-11-07 08:30:13,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [706515096] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:30:13,004 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597053221] [2021-11-07 08:30:13,004 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 08:30:13,004 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:30:13,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:30:13,006 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:30:13,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-07 08:30:19,377 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-11-07 08:30:19,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:30:19,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 653 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-07 08:30:19,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:30:19,434 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-07 08:30:19,434 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 [2021-11-07 08:30:19,438 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 [2021-11-07 08:30:21,788 INFO L134 CoverageAnalysis]: Checked inductivity of 739 backedges. 396 proven. 153 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-07 08:30:21,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1597053221] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:30:21,788 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:30:21,788 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 26] total 52 [2021-11-07 08:30:21,789 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606032701] [2021-11-07 08:30:21,789 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-07 08:30:21,790 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:30:21,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-07 08:30:21,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=407, Invalid=2245, Unknown=0, NotChecked=0, Total=2652 [2021-11-07 08:30:21,790 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) [2021-11-07 08:30:24,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:30:24,713 INFO L93 Difference]: Finished difference Result 14293 states and 15680 transitions. [2021-11-07 08:30:24,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-07 08:30:24,714 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 [2021-11-07 08:30:24,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:30:24,735 INFO L225 Difference]: With dead ends: 14293 [2021-11-07 08:30:24,736 INFO L226 Difference]: Without dead ends: 13369 [2021-11-07 08:30:24,737 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1255 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1056, Invalid=5264, Unknown=0, NotChecked=0, Total=6320 [2021-11-07 08:30:24,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13369 states. [2021-11-07 08:30:24,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13369 to 11473. [2021-11-07 08:30:24,867 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) [2021-11-07 08:30:24,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11473 states to 11473 states and 12758 transitions. [2021-11-07 08:30:24,882 INFO L78 Accepts]: Start accepts. Automaton has 11473 states and 12758 transitions. Word has length 172 [2021-11-07 08:30:24,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:30:24,882 INFO L470 AbstractCegarLoop]: Abstraction has 11473 states and 12758 transitions. [2021-11-07 08:30:24,883 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) [2021-11-07 08:30:24,883 INFO L276 IsEmpty]: Start isEmpty. Operand 11473 states and 12758 transitions. [2021-11-07 08:30:24,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-11-07 08:30:24,889 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:30:24,889 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] [2021-11-07 08:30:24,934 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-07 08:30:25,090 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable74 [2021-11-07 08:30:25,090 INFO L402 AbstractCegarLoop]: === Iteration 76 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:30:25,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:30:25,090 INFO L85 PathProgramCache]: Analyzing trace with hash -486963455, now seen corresponding path program 24 times [2021-11-07 08:30:25,090 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:30:25,091 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1498279430] [2021-11-07 08:30:25,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:30:25,091 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:30:25,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:30:25,787 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:30:25,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:30:25,792 INFO L134 CoverageAnalysis]: Checked inductivity of 739 backedges. 332 proven. 217 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-07 08:30:25,792 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:30:25,792 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1498279430] [2021-11-07 08:30:25,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1498279430] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:30:25,793 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1994820870] [2021-11-07 08:30:25,793 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-07 08:30:25,793 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:30:25,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:30:25,794 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:30:25,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-07 08:30:33,116 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2021-11-07 08:30:33,117 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:30:33,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 653 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-07 08:30:33,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:30:33,164 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:30:33,164 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 [2021-11-07 08:30:35,239 INFO L134 CoverageAnalysis]: Checked inductivity of 739 backedges. 396 proven. 153 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-07 08:30:35,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1994820870] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:30:35,239 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:30:35,239 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 27] total 54 [2021-11-07 08:30:35,239 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937767060] [2021-11-07 08:30:35,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-07 08:30:35,240 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:30:35,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-07 08:30:35,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=2418, Unknown=0, NotChecked=0, Total=2862 [2021-11-07 08:30:35,241 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) [2021-11-07 08:30:37,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:30:37,386 INFO L93 Difference]: Finished difference Result 17196 states and 18788 transitions. [2021-11-07 08:30:37,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-07 08:30:37,387 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 [2021-11-07 08:30:37,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:30:37,406 INFO L225 Difference]: With dead ends: 17196 [2021-11-07 08:30:37,407 INFO L226 Difference]: Without dead ends: 17177 [2021-11-07 08:30:37,408 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2029 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=879, Invalid=4671, Unknown=0, NotChecked=0, Total=5550 [2021-11-07 08:30:37,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17177 states. [2021-11-07 08:30:37,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17177 to 12942. [2021-11-07 08:30:37,581 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) [2021-11-07 08:30:37,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12942 states to 12942 states and 14411 transitions. [2021-11-07 08:30:37,603 INFO L78 Accepts]: Start accepts. Automaton has 12942 states and 14411 transitions. Word has length 172 [2021-11-07 08:30:37,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:30:37,604 INFO L470 AbstractCegarLoop]: Abstraction has 12942 states and 14411 transitions. [2021-11-07 08:30:37,604 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) [2021-11-07 08:30:37,605 INFO L276 IsEmpty]: Start isEmpty. Operand 12942 states and 14411 transitions. [2021-11-07 08:30:37,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-11-07 08:30:37,617 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:30:37,618 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] [2021-11-07 08:30:37,679 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-07 08:30:37,834 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:30:37,834 INFO L402 AbstractCegarLoop]: === Iteration 77 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:30:37,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:30:37,835 INFO L85 PathProgramCache]: Analyzing trace with hash -1288272290, now seen corresponding path program 25 times [2021-11-07 08:30:37,835 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:30:37,835 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616967518] [2021-11-07 08:30:37,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:30:37,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:30:37,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:30:41,633 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:30:41,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:30:41,638 INFO L134 CoverageAnalysis]: Checked inductivity of 776 backedges. 51 proven. 725 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:30:41,638 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:30:41,638 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616967518] [2021-11-07 08:30:41,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1616967518] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:30:41,639 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161142796] [2021-11-07 08:30:41,639 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 08:30:41,639 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:30:41,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:30:41,640 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:30:41,645 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7a7434a-9c39-446a-bacb-87371b9afc1b/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-07 08:30:48,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:30:48,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 82 conjunts are in the unsatisfiable core [2021-11-07 08:30:48,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:30:49,703 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 [2021-11-07 08:30:51,904 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 [2021-11-07 08:30:51,924 INFO L134 CoverageAnalysis]: Checked inductivity of 776 backedges. 51 proven. 535 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-07 08:30:51,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1161142796] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:30:51,924 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:30:51,924 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 33] total 74 [2021-11-07 08:30:51,924 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689571037] [2021-11-07 08:30:51,925 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-07 08:30:51,925 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:30:51,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-07 08:30:51,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=5179, Unknown=0, NotChecked=0, Total=5402 [2021-11-07 08:30:51,926 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)