./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/subseq-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_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/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_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/subseq-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/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_f0500092-8f78-4509-9c9f-217c910567ae/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 332083c9703e7f789c3b57b3574f68dffe1c5555ad9f8a0d56f0eaba0a86f436 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 07:59:26,501 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 07:59:26,504 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 07:59:26,547 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 07:59:26,548 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 07:59:26,550 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 07:59:26,552 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 07:59:26,555 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 07:59:26,558 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 07:59:26,560 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 07:59:26,561 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 07:59:26,563 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 07:59:26,564 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 07:59:26,566 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 07:59:26,568 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 07:59:26,570 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 07:59:26,572 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 07:59:26,573 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 07:59:26,577 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 07:59:26,581 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 07:59:26,584 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 07:59:26,586 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 07:59:26,588 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 07:59:26,590 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 07:59:26,596 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 07:59:26,597 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 07:59:26,597 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 07:59:26,599 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 07:59:26,600 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 07:59:26,601 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 07:59:26,602 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 07:59:26,603 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 07:59:26,605 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 07:59:26,606 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 07:59:26,608 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 07:59:26,608 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 07:59:26,610 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 07:59:26,610 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 07:59:26,611 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 07:59:26,612 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 07:59:26,613 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 07:59:26,622 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-11-07 07:59:26,678 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 07:59:26,681 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 07:59:26,683 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-07 07:59:26,683 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-07 07:59:26,685 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-07 07:59:26,686 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-07 07:59:26,686 INFO L138 SettingsManager]: * Use SBE=true [2021-11-07 07:59:26,686 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 07:59:26,687 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 07:59:26,687 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-07 07:59:26,688 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 07:59:26,689 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 07:59:26,689 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 07:59:26,689 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-07 07:59:26,689 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-07 07:59:26,690 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-07 07:59:26,690 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 07:59:26,690 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 07:59:26,690 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 07:59:26,691 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 07:59:26,691 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 07:59:26,691 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 07:59:26,692 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 07:59:26,692 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 07:59:26,692 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 07:59:26,693 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 07:59:26,693 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-07 07:59:26,693 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 07:59:26,694 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 07:59:26,695 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_f0500092-8f78-4509-9c9f-217c910567ae/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 332083c9703e7f789c3b57b3574f68dffe1c5555ad9f8a0d56f0eaba0a86f436 [2021-11-07 07:59:26,995 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 07:59:27,033 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 07:59:27,037 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 07:59:27,039 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 07:59:27,040 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 07:59:27,042 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/../../sv-benchmarks/c/array-memsafety/subseq-alloca-2.i [2021-11-07 07:59:27,140 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/data/5bf141b7c/c29f3d636973438289450f423f406909/FLAG4a6937b91 [2021-11-07 07:59:27,754 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 07:59:27,755 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/sv-benchmarks/c/array-memsafety/subseq-alloca-2.i [2021-11-07 07:59:27,783 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/data/5bf141b7c/c29f3d636973438289450f423f406909/FLAG4a6937b91 [2021-11-07 07:59:28,053 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/data/5bf141b7c/c29f3d636973438289450f423f406909 [2021-11-07 07:59:28,056 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 07:59:28,058 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-07 07:59:28,060 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 07:59:28,061 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 07:59:28,065 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 07:59:28,066 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 07:59:28" (1/1) ... [2021-11-07 07:59:28,068 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@369ae7ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:59:28, skipping insertion in model container [2021-11-07 07:59:28,068 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 07:59:28" (1/1) ... [2021-11-07 07:59:28,077 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 07:59:28,137 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 07:59:28,551 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 07:59:28,562 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 07:59:28,665 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 07:59:28,714 INFO L208 MainTranslator]: Completed translation [2021-11-07 07:59:28,715 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:59:28 WrapperNode [2021-11-07 07:59:28,715 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 07:59:28,717 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 07:59:28,717 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 07:59:28,718 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 07:59:28,733 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:59:28" (1/1) ... [2021-11-07 07:59:28,736 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:59:28" (1/1) ... [2021-11-07 07:59:28,758 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:59:28" (1/1) ... [2021-11-07 07:59:28,759 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:59:28" (1/1) ... [2021-11-07 07:59:28,779 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:59:28" (1/1) ... [2021-11-07 07:59:28,785 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:59:28" (1/1) ... [2021-11-07 07:59:28,790 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:59:28" (1/1) ... [2021-11-07 07:59:28,798 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 07:59:28,799 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 07:59:28,799 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 07:59:28,800 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 07:59:28,801 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:59:28" (1/1) ... [2021-11-07 07:59:28,821 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 07:59:28,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:59:28,848 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 07:59:28,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 07:59:28,884 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-07 07:59:28,884 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 07:59:28,885 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-07 07:59:28,885 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-07 07:59:28,885 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2021-11-07 07:59:28,885 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2021-11-07 07:59:28,885 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2021-11-07 07:59:28,886 INFO L138 BoogieDeclarations]: Found implementation of procedure subseq [2021-11-07 07:59:28,886 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-07 07:59:28,886 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-07 07:59:28,886 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-07 07:59:28,886 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-07 07:59:28,887 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-07 07:59:28,887 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-07 07:59:28,887 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-07 07:59:28,887 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-07 07:59:28,887 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-07 07:59:28,888 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-07 07:59:28,888 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-07 07:59:28,888 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-07 07:59:28,888 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-07 07:59:28,888 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-07 07:59:28,888 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-07 07:59:28,889 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-07 07:59:28,889 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-07 07:59:28,889 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-07 07:59:28,896 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-07 07:59:28,896 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2021-11-07 07:59:28,896 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2021-11-07 07:59:28,896 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2021-11-07 07:59:28,897 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-07 07:59:28,897 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-07 07:59:28,897 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-07 07:59:28,897 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-07 07:59:28,897 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-07 07:59:28,897 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-07 07:59:28,898 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-07 07:59:28,898 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-07 07:59:28,898 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-07 07:59:28,898 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-07 07:59:28,898 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-07 07:59:28,898 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-07 07:59:28,899 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-07 07:59:28,899 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-07 07:59:28,899 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-07 07:59:28,899 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-07 07:59:28,899 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-07 07:59:28,899 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-07 07:59:28,899 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-07 07:59:28,900 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-07 07:59:28,900 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-07 07:59:28,900 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-07 07:59:28,900 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-07 07:59:28,900 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-07 07:59:28,900 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-07 07:59:28,901 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-07 07:59:28,901 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-07 07:59:28,901 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-07 07:59:28,901 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-07 07:59:28,901 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-07 07:59:28,901 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-07 07:59:28,901 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-07 07:59:28,902 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-07 07:59:28,902 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-07 07:59:28,902 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-07 07:59:28,902 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-07 07:59:28,902 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-07 07:59:28,902 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-07 07:59:28,903 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-07 07:59:28,903 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-07 07:59:28,903 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-07 07:59:28,903 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-11-07 07:59:28,903 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-07 07:59:28,903 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-07 07:59:28,903 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-11-07 07:59:28,904 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-07 07:59:28,904 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-07 07:59:28,904 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-11-07 07:59:28,904 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-07 07:59:28,904 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-07 07:59:28,904 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-07 07:59:28,904 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-07 07:59:28,905 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-07 07:59:28,905 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-07 07:59:28,905 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-07 07:59:28,905 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-07 07:59:28,905 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-07 07:59:28,905 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-07 07:59:28,906 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-07 07:59:28,906 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-07 07:59:28,906 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-07 07:59:28,906 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-07 07:59:28,906 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-07 07:59:28,906 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-07 07:59:28,906 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-07 07:59:28,907 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-07 07:59:28,907 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-07 07:59:28,907 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-07 07:59:28,907 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-07 07:59:28,907 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-07 07:59:28,907 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-07 07:59:28,907 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-07 07:59:28,908 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-07 07:59:28,908 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-07 07:59:28,908 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-07 07:59:28,908 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-07 07:59:28,908 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-07 07:59:28,908 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-07 07:59:28,909 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-07 07:59:28,909 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-07 07:59:28,909 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-07 07:59:28,909 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-07 07:59:28,909 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-07 07:59:28,909 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-07 07:59:28,909 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-07 07:59:28,910 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-07 07:59:28,910 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-11-07 07:59:28,910 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2021-11-07 07:59:28,910 INFO L130 BoogieDeclarations]: Found specification of procedure subseq [2021-11-07 07:59:28,910 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-07 07:59:28,910 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-07 07:59:28,911 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 07:59:28,911 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-07 07:59:28,911 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-07 07:59:28,911 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-07 07:59:28,911 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 07:59:29,467 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 07:59:29,467 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-07 07:59:29,469 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 07:59:29 BoogieIcfgContainer [2021-11-07 07:59:29,470 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 07:59:29,472 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 07:59:29,472 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 07:59:29,487 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 07:59:29,487 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 07:59:28" (1/3) ... [2021-11-07 07:59:29,488 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11ebee33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 07:59:29, skipping insertion in model container [2021-11-07 07:59:29,488 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 07:59:28" (2/3) ... [2021-11-07 07:59:29,491 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11ebee33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 07:59:29, skipping insertion in model container [2021-11-07 07:59:29,491 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 07:59:29" (3/3) ... [2021-11-07 07:59:29,493 INFO L111 eAbstractionObserver]: Analyzing ICFG subseq-alloca-2.i [2021-11-07 07:59:29,505 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 07:59:29,506 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 19 error locations. [2021-11-07 07:59:29,572 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 07:59:29,585 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 07:59:29,585 INFO L340 AbstractCegarLoop]: Starting to check reachability of 19 error locations. [2021-11-07 07:59:29,611 INFO L276 IsEmpty]: Start isEmpty. Operand has 60 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 53 states have internal predecessors, (64), 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 07:59:29,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-07 07:59:29,621 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:29,621 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:59:29,622 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:29,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:29,631 INFO L85 PathProgramCache]: Analyzing trace with hash -1096953401, now seen corresponding path program 1 times [2021-11-07 07:59:29,660 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:29,661 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [585526893] [2021-11-07 07:59:29,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:29,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:29,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:29,896 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:29,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:29,909 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 07:59:29,910 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:29,910 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [585526893] [2021-11-07 07:59:29,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [585526893] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:29,912 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:29,912 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 07:59:29,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634401964] [2021-11-07 07:59:29,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 07:59:29,951 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:29,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 07:59:29,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-07 07:59:29,975 INFO L87 Difference]: Start difference. First operand has 60 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 53 states have internal predecessors, (64), 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 07:59:30,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:30,293 INFO L93 Difference]: Finished difference Result 81 states and 91 transitions. [2021-11-07 07:59:30,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 07:59:30,295 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 07:59:30,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:30,308 INFO L225 Difference]: With dead ends: 81 [2021-11-07 07:59:30,308 INFO L226 Difference]: Without dead ends: 77 [2021-11-07 07:59:30,311 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 07:59:30,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-07 07:59:30,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 60. [2021-11-07 07:59:30,363 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 07:59:30,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 68 transitions. [2021-11-07 07:59:30,366 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 68 transitions. Word has length 11 [2021-11-07 07:59:30,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:30,367 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 68 transitions. [2021-11-07 07:59:30,367 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 07:59:30,368 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 68 transitions. [2021-11-07 07:59:30,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-07 07:59:30,368 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:30,369 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:59:30,369 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 07:59:30,369 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:30,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:30,370 INFO L85 PathProgramCache]: Analyzing trace with hash -1095106359, now seen corresponding path program 1 times [2021-11-07 07:59:30,371 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:30,371 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1760899487] [2021-11-07 07:59:30,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:30,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:30,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:30,523 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:30,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:30,546 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 07:59:30,546 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:30,547 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1760899487] [2021-11-07 07:59:30,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1760899487] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:30,548 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:30,549 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 07:59:30,549 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844306929] [2021-11-07 07:59:30,550 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 07:59:30,551 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:30,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 07:59:30,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 07:59:30,558 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 07:59:30,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:30,762 INFO L93 Difference]: Finished difference Result 82 states and 92 transitions. [2021-11-07 07:59:30,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 07:59:30,762 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 07:59:30,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:30,765 INFO L225 Difference]: With dead ends: 82 [2021-11-07 07:59:30,765 INFO L226 Difference]: Without dead ends: 82 [2021-11-07 07:59:30,766 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 07:59:30,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-07 07:59:30,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 62. [2021-11-07 07:59:30,775 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 07:59:30,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 72 transitions. [2021-11-07 07:59:30,780 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 72 transitions. Word has length 11 [2021-11-07 07:59:30,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:30,781 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 72 transitions. [2021-11-07 07:59:30,781 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 07:59:30,782 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 72 transitions. [2021-11-07 07:59:30,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-07 07:59:30,784 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:30,784 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:59:30,784 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 07:59:30,785 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:30,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:30,787 INFO L85 PathProgramCache]: Analyzing trace with hash -1095106360, now seen corresponding path program 1 times [2021-11-07 07:59:30,787 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:30,788 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [166152234] [2021-11-07 07:59:30,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:30,789 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:30,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:30,839 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:30,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:30,847 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 07:59:30,848 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:30,848 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [166152234] [2021-11-07 07:59:30,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [166152234] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:30,849 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:30,849 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 07:59:30,849 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435666709] [2021-11-07 07:59:30,850 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 07:59:30,850 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:30,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 07:59:30,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 07:59:30,851 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 07:59:30,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:30,987 INFO L93 Difference]: Finished difference Result 60 states and 69 transitions. [2021-11-07 07:59:30,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 07:59:30,991 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 07:59:30,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:30,993 INFO L225 Difference]: With dead ends: 60 [2021-11-07 07:59:30,993 INFO L226 Difference]: Without dead ends: 60 [2021-11-07 07:59:30,994 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 07:59:30,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-07 07:59:31,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-11-07 07:59:31,008 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 07:59:31,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 69 transitions. [2021-11-07 07:59:31,013 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 69 transitions. Word has length 11 [2021-11-07 07:59:31,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:31,013 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 69 transitions. [2021-11-07 07:59:31,013 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 07:59:31,013 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 69 transitions. [2021-11-07 07:59:31,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-07 07:59:31,014 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:31,014 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:59:31,014 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 07:59:31,015 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:31,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:31,015 INFO L85 PathProgramCache]: Analyzing trace with hash -1905282242, now seen corresponding path program 1 times [2021-11-07 07:59:31,015 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:31,016 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406650238] [2021-11-07 07:59:31,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:31,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:31,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:31,140 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:31,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:31,157 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 07:59:31,158 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:31,158 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406650238] [2021-11-07 07:59:31,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406650238] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:31,159 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:31,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 07:59:31,164 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697128490] [2021-11-07 07:59:31,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 07:59:31,165 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:31,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 07:59:31,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-07 07:59:31,166 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 07:59:31,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:31,355 INFO L93 Difference]: Finished difference Result 59 states and 68 transitions. [2021-11-07 07:59:31,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 07:59:31,356 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 07:59:31,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:31,357 INFO L225 Difference]: With dead ends: 59 [2021-11-07 07:59:31,357 INFO L226 Difference]: Without dead ends: 59 [2021-11-07 07:59:31,358 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 07:59:31,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-07 07:59:31,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-07 07:59:31,362 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 07:59:31,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 68 transitions. [2021-11-07 07:59:31,365 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 68 transitions. Word has length 13 [2021-11-07 07:59:31,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:31,365 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 68 transitions. [2021-11-07 07:59:31,366 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 07:59:31,366 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 68 transitions. [2021-11-07 07:59:31,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-07 07:59:31,367 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:31,367 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:59:31,367 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 07:59:31,367 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr2REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:31,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:31,368 INFO L85 PathProgramCache]: Analyzing trace with hash -1905282190, now seen corresponding path program 1 times [2021-11-07 07:59:31,369 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:31,369 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1259012736] [2021-11-07 07:59:31,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:31,369 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:31,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:31,428 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:31,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:31,438 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 07:59:31,438 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:31,439 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1259012736] [2021-11-07 07:59:31,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1259012736] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:31,439 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:31,439 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 07:59:31,440 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829902154] [2021-11-07 07:59:31,440 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 07:59:31,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:31,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 07:59:31,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-07 07:59:31,442 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 07:59:31,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:31,584 INFO L93 Difference]: Finished difference Result 79 states and 90 transitions. [2021-11-07 07:59:31,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 07:59:31,585 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 07:59:31,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:31,586 INFO L225 Difference]: With dead ends: 79 [2021-11-07 07:59:31,587 INFO L226 Difference]: Without dead ends: 79 [2021-11-07 07:59:31,587 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 07:59:31,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-07 07:59:31,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 70. [2021-11-07 07:59:31,594 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 07:59:31,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 82 transitions. [2021-11-07 07:59:31,596 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 82 transitions. Word has length 13 [2021-11-07 07:59:31,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:31,596 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 82 transitions. [2021-11-07 07:59:31,596 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 07:59:31,597 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 82 transitions. [2021-11-07 07:59:31,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-07 07:59:31,598 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:31,598 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:59:31,598 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-07 07:59:31,598 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr2REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:31,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:31,599 INFO L85 PathProgramCache]: Analyzing trace with hash -1848023888, now seen corresponding path program 1 times [2021-11-07 07:59:31,599 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:31,600 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330770373] [2021-11-07 07:59:31,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:31,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:31,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:31,641 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:31,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:31,647 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 07:59:31,647 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:31,648 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [330770373] [2021-11-07 07:59:31,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [330770373] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:31,648 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:31,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 07:59:31,649 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509171593] [2021-11-07 07:59:31,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 07:59:31,649 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:31,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 07:59:31,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 07:59:31,651 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 07:59:31,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:31,763 INFO L93 Difference]: Finished difference Result 68 states and 80 transitions. [2021-11-07 07:59:31,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 07:59:31,764 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 07:59:31,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:31,765 INFO L225 Difference]: With dead ends: 68 [2021-11-07 07:59:31,766 INFO L226 Difference]: Without dead ends: 68 [2021-11-07 07:59:31,766 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 07:59:31,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-07 07:59:31,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-07 07:59:31,771 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 07:59:31,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 80 transitions. [2021-11-07 07:59:31,773 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 80 transitions. Word has length 13 [2021-11-07 07:59:31,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:31,773 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 80 transitions. [2021-11-07 07:59:31,774 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 07:59:31,774 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 80 transitions. [2021-11-07 07:59:31,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-07 07:59:31,775 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:31,775 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:59:31,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-07 07:59:31,776 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:31,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:31,777 INFO L85 PathProgramCache]: Analyzing trace with hash -1848023887, now seen corresponding path program 1 times [2021-11-07 07:59:31,777 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:31,777 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70352796] [2021-11-07 07:59:31,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:31,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:31,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:31,864 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:31,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:31,871 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 07:59:31,871 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:31,872 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70352796] [2021-11-07 07:59:31,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [70352796] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:31,872 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:31,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 07:59:31,873 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202430118] [2021-11-07 07:59:31,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 07:59:31,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:31,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 07:59:31,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-07 07:59:31,875 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 07:59:32,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:32,053 INFO L93 Difference]: Finished difference Result 79 states and 92 transitions. [2021-11-07 07:59:32,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 07:59:32,054 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 07:59:32,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:32,055 INFO L225 Difference]: With dead ends: 79 [2021-11-07 07:59:32,055 INFO L226 Difference]: Without dead ends: 79 [2021-11-07 07:59:32,056 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 07:59:32,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-07 07:59:32,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 70. [2021-11-07 07:59:32,061 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 07:59:32,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 83 transitions. [2021-11-07 07:59:32,063 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 83 transitions. Word has length 13 [2021-11-07 07:59:32,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:32,063 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 83 transitions. [2021-11-07 07:59:32,064 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 07:59:32,064 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 83 transitions. [2021-11-07 07:59:32,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-07 07:59:32,065 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:32,065 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:59:32,065 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-07 07:59:32,065 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:32,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:32,066 INFO L85 PathProgramCache]: Analyzing trace with hash 1065792642, now seen corresponding path program 1 times [2021-11-07 07:59:32,067 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:32,067 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2086830312] [2021-11-07 07:59:32,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:32,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:32,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:32,129 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:32,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:32,134 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 07:59:32,134 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:32,135 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2086830312] [2021-11-07 07:59:32,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2086830312] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:32,135 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:32,135 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 07:59:32,136 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1984708556] [2021-11-07 07:59:32,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 07:59:32,136 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:32,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 07:59:32,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-07 07:59:32,137 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 07:59:32,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:32,258 INFO L93 Difference]: Finished difference Result 69 states and 82 transitions. [2021-11-07 07:59:32,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 07:59:32,259 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 07:59:32,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:32,260 INFO L225 Difference]: With dead ends: 69 [2021-11-07 07:59:32,260 INFO L226 Difference]: Without dead ends: 69 [2021-11-07 07:59:32,261 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 07:59:32,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-11-07 07:59:32,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-11-07 07:59:32,265 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 07:59:32,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 82 transitions. [2021-11-07 07:59:32,267 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 82 transitions. Word has length 14 [2021-11-07 07:59:32,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:32,267 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 82 transitions. [2021-11-07 07:59:32,267 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 07:59:32,268 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 82 transitions. [2021-11-07 07:59:32,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-07 07:59:32,273 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:32,273 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:59:32,273 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-07 07:59:32,273 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting mainErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:32,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:32,274 INFO L85 PathProgramCache]: Analyzing trace with hash -591541108, now seen corresponding path program 1 times [2021-11-07 07:59:32,274 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:32,274 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1206529261] [2021-11-07 07:59:32,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:32,275 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:32,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:32,441 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:32,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:32,451 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 07:59:32,451 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:32,451 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1206529261] [2021-11-07 07:59:32,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1206529261] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:32,452 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [822380971] [2021-11-07 07:59:32,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:32,452 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:59:32,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:59:32,461 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:59:32,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-07 07:59:32,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:32,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-07 07:59:32,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:59:32,799 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-07 07:59:32,800 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 07:59:32,808 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 07:59:32,916 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 07:59:32,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [822380971] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:32,916 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:59:32,917 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-11-07 07:59:32,917 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458230774] [2021-11-07 07:59:32,917 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 07:59:32,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:32,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 07:59:32,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-07 07:59:32,919 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 07:59:33,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:33,121 INFO L93 Difference]: Finished difference Result 88 states and 102 transitions. [2021-11-07 07:59:33,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 07:59:33,121 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 07:59:33,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:33,123 INFO L225 Difference]: With dead ends: 88 [2021-11-07 07:59:33,123 INFO L226 Difference]: Without dead ends: 88 [2021-11-07 07:59:33,123 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 07:59:33,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-07 07:59:33,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 64. [2021-11-07 07:59:33,129 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 07:59:33,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 74 transitions. [2021-11-07 07:59:33,133 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 74 transitions. Word has length 15 [2021-11-07 07:59:33,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:33,133 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 74 transitions. [2021-11-07 07:59:33,133 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 07:59:33,133 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 74 transitions. [2021-11-07 07:59:33,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-07 07:59:33,139 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:33,139 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 07:59:33,180 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-07 07:59:33,364 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:59:33,364 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting subseqErr0REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:33,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:33,365 INFO L85 PathProgramCache]: Analyzing trace with hash -1664561696, now seen corresponding path program 1 times [2021-11-07 07:59:33,365 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:33,365 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309628607] [2021-11-07 07:59:33,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:33,366 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:33,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:33,429 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:33,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:33,442 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 07:59:33,442 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:33,446 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309628607] [2021-11-07 07:59:33,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309628607] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:33,447 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:33,447 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 07:59:33,448 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502295744] [2021-11-07 07:59:33,449 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 07:59:33,449 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:33,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 07:59:33,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-07 07:59:33,450 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 07:59:33,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:33,564 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2021-11-07 07:59:33,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 07:59:33,564 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 07:59:33,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:33,565 INFO L225 Difference]: With dead ends: 62 [2021-11-07 07:59:33,566 INFO L226 Difference]: Without dead ends: 62 [2021-11-07 07:59:33,566 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 07:59:33,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-07 07:59:33,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-11-07 07:59:33,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 47 states have (on average 1.425531914893617) 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 07:59:33,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 72 transitions. [2021-11-07 07:59:33,570 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 72 transitions. Word has length 17 [2021-11-07 07:59:33,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:33,570 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 72 transitions. [2021-11-07 07:59:33,570 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 07:59:33,570 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 72 transitions. [2021-11-07 07:59:33,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-07 07:59:33,571 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:33,571 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 07:59:33,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-07 07:59:33,572 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting subseqErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:33,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:33,572 INFO L85 PathProgramCache]: Analyzing trace with hash -1664561695, now seen corresponding path program 1 times [2021-11-07 07:59:33,572 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:33,572 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1998141050] [2021-11-07 07:59:33,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:33,573 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:33,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:33,697 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:33,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:33,704 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 07:59:33,704 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:33,704 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1998141050] [2021-11-07 07:59:33,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1998141050] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:33,705 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:33,705 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-07 07:59:33,705 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292607559] [2021-11-07 07:59:33,706 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 07:59:33,706 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:33,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 07:59:33,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-07 07:59:33,707 INFO L87 Difference]: Start difference. First operand 62 states and 72 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 07:59:33,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:33,948 INFO L93 Difference]: Finished difference Result 82 states and 96 transitions. [2021-11-07 07:59:33,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 07:59:33,948 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 07:59:33,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:33,951 INFO L225 Difference]: With dead ends: 82 [2021-11-07 07:59:33,951 INFO L226 Difference]: Without dead ends: 82 [2021-11-07 07:59:33,952 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 07:59:33,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-07 07:59:33,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 72. [2021-11-07 07:59:33,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 57 states have (on average 1.4736842105263157) internal successors, (84), 66 states have internal predecessors, (84), 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 07:59:33,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 89 transitions. [2021-11-07 07:59:33,956 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 89 transitions. Word has length 17 [2021-11-07 07:59:33,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:33,956 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 89 transitions. [2021-11-07 07:59:33,957 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 07:59:33,957 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 89 transitions. [2021-11-07 07:59:33,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-07 07:59:33,958 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:33,958 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:59:33,958 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-07 07:59:33,958 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:33,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:33,959 INFO L85 PathProgramCache]: Analyzing trace with hash -2008977164, now seen corresponding path program 1 times [2021-11-07 07:59:33,959 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:33,959 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1999129560] [2021-11-07 07:59:33,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:33,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:33,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:34,053 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:34,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:34,057 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 07:59:34,058 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:34,058 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1999129560] [2021-11-07 07:59:34,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1999129560] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:34,058 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1415495571] [2021-11-07 07:59:34,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:34,060 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:59:34,060 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:59:34,068 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:59:34,084 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-07 07:59:34,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:34,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-07 07:59:34,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:59:34,276 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 07:59:34,276 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 07:59:34,412 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 07:59:34,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1415495571] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:34,413 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:59:34,413 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-11-07 07:59:34,413 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945815641] [2021-11-07 07:59:34,413 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 07:59:34,414 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:34,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 07:59:34,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-07 07:59:34,415 INFO L87 Difference]: Start difference. First operand 72 states and 89 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 07:59:34,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:34,616 INFO L93 Difference]: Finished difference Result 79 states and 96 transitions. [2021-11-07 07:59:34,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 07:59:34,617 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 07:59:34,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:34,618 INFO L225 Difference]: With dead ends: 79 [2021-11-07 07:59:34,618 INFO L226 Difference]: Without dead ends: 79 [2021-11-07 07:59:34,618 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 07:59:34,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-07 07:59:34,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 69. [2021-11-07 07:59:34,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 55 states have (on average 1.4545454545454546) internal successors, (80), 63 states have internal predecessors, (80), 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 07:59:34,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 85 transitions. [2021-11-07 07:59:34,623 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 85 transitions. Word has length 17 [2021-11-07 07:59:34,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:34,623 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 85 transitions. [2021-11-07 07:59:34,624 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 07:59:34,624 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 85 transitions. [2021-11-07 07:59:34,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-07 07:59:34,625 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:34,625 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:59:34,670 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-07 07:59:34,839 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-07 07:59:34,839 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting subseqErr2REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:34,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:34,839 INFO L85 PathProgramCache]: Analyzing trace with hash 734958862, now seen corresponding path program 1 times [2021-11-07 07:59:34,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:34,840 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1564792435] [2021-11-07 07:59:34,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:34,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:34,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:34,912 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:34,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:34,920 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 07:59:34,920 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:34,921 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1564792435] [2021-11-07 07:59:34,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1564792435] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:34,921 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:34,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 07:59:34,921 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955499346] [2021-11-07 07:59:34,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 07:59:34,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:34,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 07:59:34,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-07 07:59:34,923 INFO L87 Difference]: Start difference. First operand 69 states and 85 transitions. Second operand has 6 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 07:59:35,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:35,058 INFO L93 Difference]: Finished difference Result 66 states and 80 transitions. [2021-11-07 07:59:35,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 07:59:35,059 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-11-07 07:59:35,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:35,060 INFO L225 Difference]: With dead ends: 66 [2021-11-07 07:59:35,060 INFO L226 Difference]: Without dead ends: 66 [2021-11-07 07:59:35,061 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 07:59:35,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-07 07:59:35,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-11-07 07:59:35,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 55 states have (on average 1.3636363636363635) internal successors, (75), 60 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 07:59:35,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 80 transitions. [2021-11-07 07:59:35,065 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 80 transitions. Word has length 20 [2021-11-07 07:59:35,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:35,066 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 80 transitions. [2021-11-07 07:59:35,066 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 07:59:35,066 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 80 transitions. [2021-11-07 07:59:35,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-07 07:59:35,067 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:35,067 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:59:35,068 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-07 07:59:35,068 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting subseqErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:35,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:35,069 INFO L85 PathProgramCache]: Analyzing trace with hash 734958863, now seen corresponding path program 1 times [2021-11-07 07:59:35,069 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:35,069 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1708887103] [2021-11-07 07:59:35,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:35,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:35,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:35,170 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:35,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:35,180 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 07:59:35,180 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:35,180 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1708887103] [2021-11-07 07:59:35,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1708887103] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:35,181 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:35,181 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-07 07:59:35,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841823794] [2021-11-07 07:59:35,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 07:59:35,184 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:35,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 07:59:35,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-07 07:59:35,186 INFO L87 Difference]: Start difference. First operand 66 states and 80 transitions. Second operand has 8 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 07:59:35,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:35,418 INFO L93 Difference]: Finished difference Result 81 states and 99 transitions. [2021-11-07 07:59:35,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 07:59:35,419 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-11-07 07:59:35,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:35,420 INFO L225 Difference]: With dead ends: 81 [2021-11-07 07:59:35,420 INFO L226 Difference]: Without dead ends: 81 [2021-11-07 07:59:35,421 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-07 07:59:35,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-07 07:59:35,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 75. [2021-11-07 07:59:35,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 64 states have (on average 1.34375) internal successors, (86), 69 states have internal predecessors, (86), 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 07:59:35,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 91 transitions. [2021-11-07 07:59:35,425 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 91 transitions. Word has length 20 [2021-11-07 07:59:35,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:35,426 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 91 transitions. [2021-11-07 07:59:35,426 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 07:59:35,426 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 91 transitions. [2021-11-07 07:59:35,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-07 07:59:35,427 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:35,427 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 07:59:35,427 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-07 07:59:35,428 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting subseqErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:35,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:35,428 INFO L85 PathProgramCache]: Analyzing trace with hash -1299262575, now seen corresponding path program 1 times [2021-11-07 07:59:35,428 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:35,428 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146036546] [2021-11-07 07:59:35,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:35,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:35,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:35,463 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:35,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:35,467 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 07:59:35,467 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:35,467 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146036546] [2021-11-07 07:59:35,468 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [146036546] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:35,468 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:35,468 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 07:59:35,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860127000] [2021-11-07 07:59:35,468 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 07:59:35,469 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:35,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 07:59:35,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 07:59:35,469 INFO L87 Difference]: Start difference. First operand 75 states and 91 transitions. Second operand has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 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 07:59:35,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:35,549 INFO L93 Difference]: Finished difference Result 78 states and 94 transitions. [2021-11-07 07:59:35,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 07:59:35,550 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 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 07:59:35,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:35,551 INFO L225 Difference]: With dead ends: 78 [2021-11-07 07:59:35,551 INFO L226 Difference]: Without dead ends: 78 [2021-11-07 07:59:35,553 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 07:59:35,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-07 07:59:35,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2021-11-07 07:59:35,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 66 states have (on average 1.3333333333333333) internal successors, (88), 71 states have internal predecessors, (88), 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 07:59:35,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 93 transitions. [2021-11-07 07:59:35,559 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 93 transitions. Word has length 25 [2021-11-07 07:59:35,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:35,559 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 93 transitions. [2021-11-07 07:59:35,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 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 07:59:35,559 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 93 transitions. [2021-11-07 07:59:35,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-07 07:59:35,563 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:35,564 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 07:59:35,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-07 07:59:35,564 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting mainErr8ENSURES_VIOLATIONMEMORY_LEAK === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:35,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:35,565 INFO L85 PathProgramCache]: Analyzing trace with hash 1372681408, now seen corresponding path program 1 times [2021-11-07 07:59:35,565 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:35,565 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629812802] [2021-11-07 07:59:35,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:35,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:35,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:35,650 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:35,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:35,656 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-11-07 07:59:35,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:35,667 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 07:59:35,667 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:35,668 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629812802] [2021-11-07 07:59:35,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1629812802] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:35,668 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:35,668 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 07:59:35,668 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051302690] [2021-11-07 07:59:35,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 07:59:35,669 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:35,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 07:59:35,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-07 07:59:35,673 INFO L87 Difference]: Start difference. First operand 77 states and 93 transitions. Second operand has 5 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 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 07:59:35,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:35,737 INFO L93 Difference]: Finished difference Result 76 states and 92 transitions. [2021-11-07 07:59:35,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 07:59:35,738 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 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 26 [2021-11-07 07:59:35,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:35,740 INFO L225 Difference]: With dead ends: 76 [2021-11-07 07:59:35,740 INFO L226 Difference]: Without dead ends: 69 [2021-11-07 07:59:35,741 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 07:59:35,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-11-07 07:59:35,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-11-07 07:59:35,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 60 states have (on average 1.3) internal successors, (78), 64 states have internal predecessors, (78), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 07:59:35,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 82 transitions. [2021-11-07 07:59:35,746 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 82 transitions. Word has length 26 [2021-11-07 07:59:35,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:35,746 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 82 transitions. [2021-11-07 07:59:35,747 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 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 07:59:35,747 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 82 transitions. [2021-11-07 07:59:35,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-07 07:59:35,748 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:35,748 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:59:35,748 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-07 07:59:35,748 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting subseqErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:35,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:35,749 INFO L85 PathProgramCache]: Analyzing trace with hash 1988152110, now seen corresponding path program 1 times [2021-11-07 07:59:35,749 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:35,750 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [473994931] [2021-11-07 07:59:35,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:35,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:35,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:35,964 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:35,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:35,968 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 07:59:35,969 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:35,969 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [473994931] [2021-11-07 07:59:35,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [473994931] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:35,969 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:35,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-07 07:59:35,970 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003534911] [2021-11-07 07:59:35,971 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 07:59:35,971 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:35,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 07:59:35,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-11-07 07:59:35,973 INFO L87 Difference]: Start difference. First operand 69 states and 82 transitions. Second operand has 10 states, 10 states have (on average 2.3) internal successors, (23), 8 states have internal predecessors, (23), 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 07:59:36,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:36,294 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2021-11-07 07:59:36,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-07 07:59:36,294 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 8 states have internal predecessors, (23), 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 27 [2021-11-07 07:59:36,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:36,295 INFO L225 Difference]: With dead ends: 83 [2021-11-07 07:59:36,295 INFO L226 Difference]: Without dead ends: 64 [2021-11-07 07:59:36,295 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2021-11-07 07:59:36,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-07 07:59:36,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-11-07 07:59:36,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 55 states have (on average 1.290909090909091) internal successors, (71), 59 states have internal predecessors, (71), 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 07:59:36,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 75 transitions. [2021-11-07 07:59:36,298 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 75 transitions. Word has length 27 [2021-11-07 07:59:36,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:36,298 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 75 transitions. [2021-11-07 07:59:36,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 8 states have internal predecessors, (23), 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 07:59:36,298 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 75 transitions. [2021-11-07 07:59:36,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-07 07:59:36,299 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:36,299 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 07:59:36,299 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-07 07:59:36,299 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting subseqErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:36,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:36,299 INFO L85 PathProgramCache]: Analyzing trace with hash -1884113360, now seen corresponding path program 1 times [2021-11-07 07:59:36,300 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:36,300 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1625739998] [2021-11-07 07:59:36,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:36,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:36,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:36,523 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:36,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:36,531 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 07:59:36,532 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:36,533 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1625739998] [2021-11-07 07:59:36,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1625739998] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:36,533 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:36,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-07 07:59:36,534 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289435863] [2021-11-07 07:59:36,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-07 07:59:36,537 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:36,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-07 07:59:36,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-11-07 07:59:36,540 INFO L87 Difference]: Start difference. First operand 64 states and 75 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 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 07:59:36,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:36,866 INFO L93 Difference]: Finished difference Result 86 states and 99 transitions. [2021-11-07 07:59:36,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 07:59:36,867 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 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 27 [2021-11-07 07:59:36,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:36,867 INFO L225 Difference]: With dead ends: 86 [2021-11-07 07:59:36,868 INFO L226 Difference]: Without dead ends: 72 [2021-11-07 07:59:36,868 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2021-11-07 07:59:36,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-07 07:59:36,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 66. [2021-11-07 07:59:36,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 57 states have (on average 1.280701754385965) internal successors, (73), 61 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 07:59:36,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 77 transitions. [2021-11-07 07:59:36,871 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 77 transitions. Word has length 27 [2021-11-07 07:59:36,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:36,872 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 77 transitions. [2021-11-07 07:59:36,872 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 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 07:59:36,872 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 77 transitions. [2021-11-07 07:59:36,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-07 07:59:36,873 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:36,873 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] [2021-11-07 07:59:36,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-07 07:59:36,873 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting subseqErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:36,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:36,874 INFO L85 PathProgramCache]: Analyzing trace with hash 1814338547, now seen corresponding path program 1 times [2021-11-07 07:59:36,874 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:36,874 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [896489598] [2021-11-07 07:59:36,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:36,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:36,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:37,005 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:37,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:37,009 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 07:59:37,009 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:37,010 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [896489598] [2021-11-07 07:59:37,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [896489598] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:37,010 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1626427197] [2021-11-07 07:59:37,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:37,010 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:59:37,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:59:37,011 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:59:37,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-07 07:59:37,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:37,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-07 07:59:37,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:59:37,272 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-07 07:59:37,273 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 07:59:37,278 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 07:59:37,612 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 07:59:37,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1626427197] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:37,612 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:59:37,612 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 14 [2021-11-07 07:59:37,613 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919356660] [2021-11-07 07:59:37,613 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-07 07:59:37,614 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:37,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-07 07:59:37,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2021-11-07 07:59:37,615 INFO L87 Difference]: Start difference. First operand 66 states and 77 transitions. Second operand has 15 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 12 states have internal predecessors, (43), 3 states have call successors, (5), 4 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 07:59:38,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:38,014 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2021-11-07 07:59:38,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 07:59:38,014 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 12 states have internal predecessors, (43), 3 states have call successors, (5), 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 31 [2021-11-07 07:59:38,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:38,015 INFO L225 Difference]: With dead ends: 92 [2021-11-07 07:59:38,015 INFO L226 Difference]: Without dead ends: 92 [2021-11-07 07:59:38,016 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2021-11-07 07:59:38,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-07 07:59:38,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 76. [2021-11-07 07:59:38,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 67 states have (on average 1.3134328358208955) internal successors, (88), 71 states have internal predecessors, (88), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 07:59:38,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 92 transitions. [2021-11-07 07:59:38,020 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 92 transitions. Word has length 31 [2021-11-07 07:59:38,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:38,020 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 92 transitions. [2021-11-07 07:59:38,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 12 states have internal predecessors, (43), 3 states have call successors, (5), 4 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 07:59:38,020 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 92 transitions. [2021-11-07 07:59:38,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-07 07:59:38,021 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:38,021 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 07:59:38,060 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-07 07:59:38,232 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:59:38,232 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting subseqErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:38,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:38,233 INFO L85 PathProgramCache]: Analyzing trace with hash -1203751491, now seen corresponding path program 1 times [2021-11-07 07:59:38,233 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:38,233 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182208844] [2021-11-07 07:59:38,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:38,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:38,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:38,728 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:38,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:38,737 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 07:59:38,738 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:38,738 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182208844] [2021-11-07 07:59:38,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1182208844] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:38,738 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1643094583] [2021-11-07 07:59:38,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:38,739 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:59:38,739 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:59:38,745 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:59:38,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-07 07:59:38,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:38,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-07 07:59:38,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:59:39,128 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 07:59:39,839 INFO L354 Elim1Store]: treesize reduction 22, result has 40.5 percent of original size [2021-11-07 07:59:39,840 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 34 [2021-11-07 07:59:39,898 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 07:59:39,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1643094583] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:39,899 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-07 07:59:39,899 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [15] total 24 [2021-11-07 07:59:39,899 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320881319] [2021-11-07 07:59:39,900 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-07 07:59:39,900 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:39,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-07 07:59:39,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=494, Unknown=0, NotChecked=0, Total=552 [2021-11-07 07:59:39,902 INFO L87 Difference]: Start difference. First operand 76 states and 92 transitions. Second operand has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 11 states have internal predecessors, (30), 2 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 07:59:40,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:40,453 INFO L93 Difference]: Finished difference Result 127 states and 155 transitions. [2021-11-07 07:59:40,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-07 07:59:40,454 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 11 states have internal predecessors, (30), 2 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 34 [2021-11-07 07:59:40,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:40,455 INFO L225 Difference]: With dead ends: 127 [2021-11-07 07:59:40,455 INFO L226 Difference]: Without dead ends: 127 [2021-11-07 07:59:40,456 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=126, Invalid=930, Unknown=0, NotChecked=0, Total=1056 [2021-11-07 07:59:40,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-07 07:59:40,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 89. [2021-11-07 07:59:40,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 79 states have (on average 1.2658227848101267) internal successors, (100), 83 states have internal predecessors, (100), 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 07:59:40,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 105 transitions. [2021-11-07 07:59:40,459 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 105 transitions. Word has length 34 [2021-11-07 07:59:40,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:40,460 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 105 transitions. [2021-11-07 07:59:40,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 11 states have internal predecessors, (30), 2 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 07:59:40,460 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 105 transitions. [2021-11-07 07:59:40,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-07 07:59:40,461 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:40,461 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 07:59:40,499 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-07 07:59:40,661 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:59:40,661 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting subseqErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:40,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:40,662 INFO L85 PathProgramCache]: Analyzing trace with hash -1146493189, now seen corresponding path program 1 times [2021-11-07 07:59:40,662 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:40,662 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465412669] [2021-11-07 07:59:40,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:40,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:40,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:40,828 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:40,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:40,832 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 07:59:40,833 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:40,833 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465412669] [2021-11-07 07:59:40,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1465412669] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:40,833 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:40,833 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-07 07:59:40,834 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648139042] [2021-11-07 07:59:40,834 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 07:59:40,834 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:40,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 07:59:40,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-11-07 07:59:40,835 INFO L87 Difference]: Start difference. First operand 89 states and 105 transitions. Second operand has 10 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 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 07:59:41,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:41,099 INFO L93 Difference]: Finished difference Result 86 states and 101 transitions. [2021-11-07 07:59:41,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-07 07:59:41,099 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 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 34 [2021-11-07 07:59:41,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:41,100 INFO L225 Difference]: With dead ends: 86 [2021-11-07 07:59:41,100 INFO L226 Difference]: Without dead ends: 68 [2021-11-07 07:59:41,101 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2021-11-07 07:59:41,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-07 07:59:41,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-07 07:59:41,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 59 states have (on average 1.3220338983050848) internal successors, (78), 63 states have internal predecessors, (78), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 07:59:41,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 82 transitions. [2021-11-07 07:59:41,104 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 82 transitions. Word has length 34 [2021-11-07 07:59:41,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:41,104 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 82 transitions. [2021-11-07 07:59:41,104 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 8 states have internal predecessors, (30), 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 07:59:41,104 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 82 transitions. [2021-11-07 07:59:41,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-07 07:59:41,105 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:41,105 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 07:59:41,105 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-07 07:59:41,105 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting subseqErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:41,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:41,106 INFO L85 PathProgramCache]: Analyzing trace with hash 719476543, now seen corresponding path program 1 times [2021-11-07 07:59:41,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:41,106 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2032811788] [2021-11-07 07:59:41,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:41,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:41,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:41,415 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:41,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:41,426 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 07:59:41,426 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:41,427 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2032811788] [2021-11-07 07:59:41,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2032811788] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:41,429 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:41,429 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-11-07 07:59:41,429 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724928131] [2021-11-07 07:59:41,430 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-07 07:59:41,430 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:41,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-07 07:59:41,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-07 07:59:41,431 INFO L87 Difference]: Start difference. First operand 68 states and 82 transitions. Second operand has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 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 07:59:41,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:41,871 INFO L93 Difference]: Finished difference Result 123 states and 150 transitions. [2021-11-07 07:59:41,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-07 07:59:41,873 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 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 34 [2021-11-07 07:59:41,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:41,874 INFO L225 Difference]: With dead ends: 123 [2021-11-07 07:59:41,874 INFO L226 Difference]: Without dead ends: 123 [2021-11-07 07:59:41,875 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2021-11-07 07:59:41,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-07 07:59:41,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 82. [2021-11-07 07:59:41,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 72 states have (on average 1.2777777777777777) internal successors, (92), 76 states have internal predecessors, (92), 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 07:59:41,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 97 transitions. [2021-11-07 07:59:41,879 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 97 transitions. Word has length 34 [2021-11-07 07:59:41,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:41,879 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 97 transitions. [2021-11-07 07:59:41,879 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 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 07:59:41,879 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 97 transitions. [2021-11-07 07:59:41,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-07 07:59:41,880 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:41,880 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 07:59:41,880 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-07 07:59:41,881 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting subseqErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:41,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:41,881 INFO L85 PathProgramCache]: Analyzing trace with hash 776734845, now seen corresponding path program 1 times [2021-11-07 07:59:41,881 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:41,881 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1625315759] [2021-11-07 07:59:41,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:41,882 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:41,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:42,083 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:42,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:42,102 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 07:59:42,102 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:42,102 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1625315759] [2021-11-07 07:59:42,102 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1625315759] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 07:59:42,103 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 07:59:42,103 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-07 07:59:42,103 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419595976] [2021-11-07 07:59:42,103 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-07 07:59:42,103 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:42,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-07 07:59:42,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-11-07 07:59:42,104 INFO L87 Difference]: Start difference. First operand 82 states and 97 transitions. Second operand has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 10 states have internal predecessors, (30), 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 07:59:42,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:42,416 INFO L93 Difference]: Finished difference Result 82 states and 96 transitions. [2021-11-07 07:59:42,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 07:59:42,417 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 10 states have internal predecessors, (30), 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 34 [2021-11-07 07:59:42,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:42,418 INFO L225 Difference]: With dead ends: 82 [2021-11-07 07:59:42,418 INFO L226 Difference]: Without dead ends: 72 [2021-11-07 07:59:42,419 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2021-11-07 07:59:42,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-07 07:59:42,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 69. [2021-11-07 07:59:42,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 60 states have (on average 1.3166666666666667) internal successors, (79), 64 states have internal predecessors, (79), 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 07:59:42,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 83 transitions. [2021-11-07 07:59:42,422 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 83 transitions. Word has length 34 [2021-11-07 07:59:42,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:42,422 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 83 transitions. [2021-11-07 07:59:42,422 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 10 states have internal predecessors, (30), 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 07:59:42,423 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 83 transitions. [2021-11-07 07:59:42,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-07 07:59:42,423 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:42,423 INFO L513 BasicCegarLoop]: trace histogram [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, 1, 1] [2021-11-07 07:59:42,423 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-07 07:59:42,424 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting subseqErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:42,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:42,424 INFO L85 PathProgramCache]: Analyzing trace with hash 1921545180, now seen corresponding path program 1 times [2021-11-07 07:59:42,424 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:42,424 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575088753] [2021-11-07 07:59:42,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:42,425 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:42,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:42,596 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:42,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:42,601 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 07:59:42,601 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:42,601 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575088753] [2021-11-07 07:59:42,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575088753] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:42,602 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [357248848] [2021-11-07 07:59:42,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:42,602 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:59:42,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:59:42,603 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:59:42,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-07 07:59:42,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:42,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-07 07:59:42,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:59:43,042 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 07:59:43,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [357248848] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:43,042 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:59:43,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 16 [2021-11-07 07:59:43,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882703614] [2021-11-07 07:59:43,043 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-07 07:59:43,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:43,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-07 07:59:43,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-11-07 07:59:43,045 INFO L87 Difference]: Start difference. First operand 69 states and 83 transitions. Second operand has 17 states, 14 states have (on average 4.285714285714286) internal successors, (60), 14 states have internal predecessors, (60), 3 states have call successors, (5), 4 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 07:59:43,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:43,417 INFO L93 Difference]: Finished difference Result 98 states and 118 transitions. [2021-11-07 07:59:43,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 07:59:43,418 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 4.285714285714286) internal successors, (60), 14 states have internal predecessors, (60), 3 states have call successors, (5), 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 07:59:43,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:43,419 INFO L225 Difference]: With dead ends: 98 [2021-11-07 07:59:43,419 INFO L226 Difference]: Without dead ends: 96 [2021-11-07 07:59:43,420 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-11-07 07:59:43,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-07 07:59:43,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 88. [2021-11-07 07:59:43,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 79 states have (on average 1.2531645569620253) internal successors, (99), 83 states have internal predecessors, (99), 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 07:59:43,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 103 transitions. [2021-11-07 07:59:43,424 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 103 transitions. Word has length 38 [2021-11-07 07:59:43,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:43,425 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 103 transitions. [2021-11-07 07:59:43,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 4.285714285714286) internal successors, (60), 14 states have internal predecessors, (60), 3 states have call successors, (5), 4 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 07:59:43,425 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 103 transitions. [2021-11-07 07:59:43,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-07 07:59:43,426 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:43,426 INFO L513 BasicCegarLoop]: trace histogram [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 07:59:43,472 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-07 07:59:43,646 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:59:43,646 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting subseqErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:43,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:43,646 INFO L85 PathProgramCache]: Analyzing trace with hash 1373772737, now seen corresponding path program 1 times [2021-11-07 07:59:43,646 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:43,647 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1254265264] [2021-11-07 07:59:43,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:43,647 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:43,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:44,044 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:44,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:44,053 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 07:59:44,053 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:44,053 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1254265264] [2021-11-07 07:59:44,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1254265264] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:44,053 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [370007922] [2021-11-07 07:59:44,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:44,054 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:59:44,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:59:44,061 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:59:44,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-07 07:59:44,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:44,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-07 07:59:44,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:59:44,543 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 07:59:45,405 INFO L354 Elim1Store]: treesize reduction 26, result has 33.3 percent of original size [2021-11-07 07:59:45,405 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 39 treesize of output 32 [2021-11-07 07:59:45,459 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 07:59:45,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [370007922] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:45,459 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:59:45,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 26 [2021-11-07 07:59:45,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506024626] [2021-11-07 07:59:45,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-07 07:59:45,461 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:45,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-07 07:59:45,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=590, Unknown=0, NotChecked=0, Total=650 [2021-11-07 07:59:45,465 INFO L87 Difference]: Start difference. First operand 88 states and 103 transitions. Second operand has 26 states, 25 states have (on average 3.04) internal successors, (76), 23 states have internal predecessors, (76), 3 states have call successors, (5), 4 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 07:59:48,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:48,681 INFO L93 Difference]: Finished difference Result 285 states and 319 transitions. [2021-11-07 07:59:48,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-07 07:59:48,682 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 3.04) internal successors, (76), 23 states have internal predecessors, (76), 3 states have call successors, (5), 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 45 [2021-11-07 07:59:48,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:48,684 INFO L225 Difference]: With dead ends: 285 [2021-11-07 07:59:48,684 INFO L226 Difference]: Without dead ends: 277 [2021-11-07 07:59:48,687 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1094 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=555, Invalid=4001, Unknown=0, NotChecked=0, Total=4556 [2021-11-07 07:59:48,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2021-11-07 07:59:48,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 198. [2021-11-07 07:59:48,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 186 states have (on average 1.1612903225806452) internal successors, (216), 190 states have internal predecessors, (216), 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 07:59:48,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 223 transitions. [2021-11-07 07:59:48,696 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 223 transitions. Word has length 45 [2021-11-07 07:59:48,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:48,696 INFO L470 AbstractCegarLoop]: Abstraction has 198 states and 223 transitions. [2021-11-07 07:59:48,697 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 3.04) internal successors, (76), 23 states have internal predecessors, (76), 3 states have call successors, (5), 4 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 07:59:48,697 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 223 transitions. [2021-11-07 07:59:48,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-07 07:59:48,698 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:48,698 INFO L513 BasicCegarLoop]: trace histogram [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, 1, 1] [2021-11-07 07:59:48,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-07 07:59:48,923 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:59:48,924 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting subseqErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:48,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:48,924 INFO L85 PathProgramCache]: Analyzing trace with hash -1643550677, now seen corresponding path program 1 times [2021-11-07 07:59:48,924 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:48,925 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774439127] [2021-11-07 07:59:48,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:48,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:48,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:49,265 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:49,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:49,270 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 07:59:49,270 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:49,270 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774439127] [2021-11-07 07:59:49,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [774439127] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:49,270 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [43821447] [2021-11-07 07:59:49,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:49,271 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:59:49,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:59:49,272 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:59:49,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-07 07:59:49,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:49,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-07 07:59:49,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:59:49,766 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 07:59:50,667 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 07:59:50,667 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 07:59:50,974 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 07:59:50,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [43821447] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:50,975 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:59:50,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 25 [2021-11-07 07:59:50,975 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504175996] [2021-11-07 07:59:50,975 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-07 07:59:50,975 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:50,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-07 07:59:50,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=537, Unknown=0, NotChecked=0, Total=600 [2021-11-07 07:59:50,978 INFO L87 Difference]: Start difference. First operand 198 states and 223 transitions. Second operand has 25 states, 23 states have (on average 3.652173913043478) internal successors, (84), 22 states have internal predecessors, (84), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 07:59:52,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:52,700 INFO L93 Difference]: Finished difference Result 251 states and 287 transitions. [2021-11-07 07:59:52,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-07 07:59:52,703 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 3.652173913043478) internal successors, (84), 22 states have internal predecessors, (84), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 48 [2021-11-07 07:59:52,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:52,704 INFO L225 Difference]: With dead ends: 251 [2021-11-07 07:59:52,704 INFO L226 Difference]: Without dead ends: 198 [2021-11-07 07:59:52,705 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=234, Invalid=1658, Unknown=0, NotChecked=0, Total=1892 [2021-11-07 07:59:52,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-11-07 07:59:52,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 181. [2021-11-07 07:59:52,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 171 states have (on average 1.1812865497076024) internal successors, (202), 175 states have internal predecessors, (202), 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 07:59:52,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 207 transitions. [2021-11-07 07:59:52,711 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 207 transitions. Word has length 48 [2021-11-07 07:59:52,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:52,711 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 207 transitions. [2021-11-07 07:59:52,711 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 3.652173913043478) internal successors, (84), 22 states have internal predecessors, (84), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-07 07:59:52,711 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 207 transitions. [2021-11-07 07:59:52,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-07 07:59:52,712 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:52,712 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 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] [2021-11-07 07:59:52,758 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-07 07:59:52,928 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:59:52,928 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting subseqErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:52,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:52,929 INFO L85 PathProgramCache]: Analyzing trace with hash -734429817, now seen corresponding path program 2 times [2021-11-07 07:59:52,929 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:52,929 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [188173582] [2021-11-07 07:59:52,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:52,929 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:52,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:53,090 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:53,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:53,094 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 07:59:53,095 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:53,095 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [188173582] [2021-11-07 07:59:53,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [188173582] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:53,095 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1247721275] [2021-11-07 07:59:53,095 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 07:59:53,095 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:59:53,096 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:59:53,100 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:59:53,102 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-07 07:59:53,384 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 07:59:53,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 07:59:53,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-07 07:59:53,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:59:53,860 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 07:59:53,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1247721275] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:53,861 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:59:53,861 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2021-11-07 07:59:53,861 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258981501] [2021-11-07 07:59:53,862 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 07:59:53,862 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:53,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 07:59:53,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2021-11-07 07:59:53,863 INFO L87 Difference]: Start difference. First operand 181 states and 207 transitions. Second operand has 18 states, 17 states have (on average 4.352941176470588) internal successors, (74), 15 states have internal predecessors, (74), 3 states have call successors, (5), 4 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 07:59:54,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:54,557 INFO L93 Difference]: Finished difference Result 211 states and 228 transitions. [2021-11-07 07:59:54,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-07 07:59:54,558 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 4.352941176470588) internal successors, (74), 15 states have internal predecessors, (74), 3 states have call successors, (5), 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 07:59:54,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:54,560 INFO L225 Difference]: With dead ends: 211 [2021-11-07 07:59:54,560 INFO L226 Difference]: Without dead ends: 211 [2021-11-07 07:59:54,560 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=88, Invalid=464, Unknown=0, NotChecked=0, Total=552 [2021-11-07 07:59:54,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-11-07 07:59:54,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 191. [2021-11-07 07:59:54,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 181 states have (on average 1.1878453038674033) internal successors, (215), 185 states have internal predecessors, (215), 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 07:59:54,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 220 transitions. [2021-11-07 07:59:54,569 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 220 transitions. Word has length 53 [2021-11-07 07:59:54,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:54,569 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 220 transitions. [2021-11-07 07:59:54,570 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 4.352941176470588) internal successors, (74), 15 states have internal predecessors, (74), 3 states have call successors, (5), 4 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 07:59:54,570 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 220 transitions. [2021-11-07 07:59:54,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-07 07:59:54,571 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:54,571 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 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 07:59:54,611 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-07 07:59:54,785 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-07 07:59:54,785 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting subseqErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:54,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:54,786 INFO L85 PathProgramCache]: Analyzing trace with hash 587866009, now seen corresponding path program 2 times [2021-11-07 07:59:54,786 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:54,786 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209989537] [2021-11-07 07:59:54,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:54,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:54,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:55,252 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:55,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:55,257 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 20 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 07:59:55,257 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:55,257 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209989537] [2021-11-07 07:59:55,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [209989537] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:55,258 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [797673825] [2021-11-07 07:59:55,258 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 07:59:55,258 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:59:55,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:59:55,259 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:59:55,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-07 07:59:55,729 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 07:59:55,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 07:59:55,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-07 07:59:55,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:59:55,954 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 07:59:56,288 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 07:59:56,307 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 20 proven. 28 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 07:59:56,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [797673825] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:56,308 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:59:56,308 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 14] total 27 [2021-11-07 07:59:56,308 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965657195] [2021-11-07 07:59:56,308 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-07 07:59:56,308 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:56,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-07 07:59:56,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-11-07 07:59:56,309 INFO L87 Difference]: Start difference. First operand 191 states and 220 transitions. Second operand has 27 states, 25 states have (on average 3.52) internal successors, (88), 24 states have internal predecessors, (88), 3 states have call successors, (5), 4 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 07:59:57,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:57,553 INFO L93 Difference]: Finished difference Result 289 states and 319 transitions. [2021-11-07 07:59:57,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-07 07:59:57,554 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 3.52) internal successors, (88), 24 states have internal predecessors, (88), 3 states have call successors, (5), 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 07:59:57,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:57,556 INFO L225 Difference]: With dead ends: 289 [2021-11-07 07:59:57,556 INFO L226 Difference]: Without dead ends: 205 [2021-11-07 07:59:57,557 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 533 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=269, Invalid=2083, Unknown=0, NotChecked=0, Total=2352 [2021-11-07 07:59:57,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-11-07 07:59:57,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 199. [2021-11-07 07:59:57,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 189 states have (on average 1.17989417989418) internal successors, (223), 193 states have internal predecessors, (223), 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 07:59:57,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 228 transitions. [2021-11-07 07:59:57,564 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 228 transitions. Word has length 62 [2021-11-07 07:59:57,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:57,564 INFO L470 AbstractCegarLoop]: Abstraction has 199 states and 228 transitions. [2021-11-07 07:59:57,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 3.52) internal successors, (88), 24 states have internal predecessors, (88), 3 states have call successors, (5), 4 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 07:59:57,565 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 228 transitions. [2021-11-07 07:59:57,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 07:59:57,566 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:57,566 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 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 07:59:57,609 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-07 07:59:57,779 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-07 07:59:57,780 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting subseqErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:57,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:57,780 INFO L85 PathProgramCache]: Analyzing trace with hash 682450614, now seen corresponding path program 3 times [2021-11-07 07:59:57,780 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:57,780 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597533849] [2021-11-07 07:59:57,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:57,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:57,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:58,036 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 07:59:58,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 07:59:58,044 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 1 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 07:59:58,044 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 07:59:58,045 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597533849] [2021-11-07 07:59:58,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1597533849] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:58,045 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1347241796] [2021-11-07 07:59:58,045 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 07:59:58,045 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 07:59:58,046 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 07:59:58,046 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 07:59:58,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-07 07:59:58,440 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-07 07:59:58,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 07:59:58,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-07 07:59:58,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 07:59:58,849 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 6 proven. 51 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 07:59:58,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1347241796] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 07:59:58,849 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 07:59:58,850 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 24 [2021-11-07 07:59:58,850 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806323239] [2021-11-07 07:59:58,851 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-07 07:59:58,851 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 07:59:58,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-07 07:59:58,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=518, Unknown=0, NotChecked=0, Total=600 [2021-11-07 07:59:58,852 INFO L87 Difference]: Start difference. First operand 199 states and 228 transitions. Second operand has 25 states, 22 states have (on average 5.454545454545454) internal successors, (120), 22 states have internal predecessors, (120), 3 states have call successors, (5), 4 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 07:59:59,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 07:59:59,362 INFO L93 Difference]: Finished difference Result 267 states and 314 transitions. [2021-11-07 07:59:59,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 07:59:59,372 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 22 states have (on average 5.454545454545454) internal successors, (120), 22 states have internal predecessors, (120), 3 states have call successors, (5), 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 66 [2021-11-07 07:59:59,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 07:59:59,375 INFO L225 Difference]: With dead ends: 267 [2021-11-07 07:59:59,375 INFO L226 Difference]: Without dead ends: 261 [2021-11-07 07:59:59,376 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=139, Invalid=791, Unknown=0, NotChecked=0, Total=930 [2021-11-07 07:59:59,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-11-07 07:59:59,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 248. [2021-11-07 07:59:59,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 238 states have (on average 1.1638655462184875) internal successors, (277), 242 states have internal predecessors, (277), 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 07:59:59,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 282 transitions. [2021-11-07 07:59:59,384 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 282 transitions. Word has length 66 [2021-11-07 07:59:59,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 07:59:59,385 INFO L470 AbstractCegarLoop]: Abstraction has 248 states and 282 transitions. [2021-11-07 07:59:59,385 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 22 states have (on average 5.454545454545454) internal successors, (120), 22 states have internal predecessors, (120), 3 states have call successors, (5), 4 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 07:59:59,385 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 282 transitions. [2021-11-07 07:59:59,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 07:59:59,386 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 07:59:59,387 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-11-07 07:59:59,452 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-07 07:59:59,600 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-07 07:59:59,600 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting subseqErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 07:59:59,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 07:59:59,601 INFO L85 PathProgramCache]: Analyzing trace with hash 1875830743, now seen corresponding path program 3 times [2021-11-07 07:59:59,601 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 07:59:59,601 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069682743] [2021-11-07 07:59:59,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 07:59:59,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 07:59:59,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:00,089 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:00:00,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:00,101 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 17 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:00:00,101 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:00:00,101 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069682743] [2021-11-07 08:00:00,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1069682743] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:00:00,102 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1292017518] [2021-11-07 08:00:00,102 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 08:00:00,102 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:00:00,102 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:00:00,107 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:00:00,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-07 08:00:00,575 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-07 08:00:00,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:00:00,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-07 08:00:00,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:00:01,315 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 08:00:01,407 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-07 08:00:01,407 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 08:00:03,438 INFO L354 Elim1Store]: treesize reduction 65, result has 11.0 percent of original size [2021-11-07 08:00:03,439 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 33 [2021-11-07 08:00:03,500 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 11 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:00:03,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1292017518] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:00:03,501 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:00:03,501 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 24] total 40 [2021-11-07 08:00:03,501 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485629319] [2021-11-07 08:00:03,502 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-07 08:00:03,502 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:00:03,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-07 08:00:03,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1444, Unknown=0, NotChecked=0, Total=1560 [2021-11-07 08:00:03,504 INFO L87 Difference]: Start difference. First operand 248 states and 282 transitions. Second operand has 40 states, 39 states have (on average 3.076923076923077) internal successors, (120), 37 states have internal predecessors, (120), 3 states have call successors, (5), 4 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 08:00:05,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:00:05,856 INFO L93 Difference]: Finished difference Result 389 states and 431 transitions. [2021-11-07 08:00:05,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-07 08:00:05,858 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 3.076923076923077) internal successors, (120), 37 states have internal predecessors, (120), 3 states have call successors, (5), 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 08:00:05,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:00:05,861 INFO L225 Difference]: With dead ends: 389 [2021-11-07 08:00:05,861 INFO L226 Difference]: Without dead ends: 381 [2021-11-07 08:00:05,863 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 961 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=359, Invalid=3801, Unknown=0, NotChecked=0, Total=4160 [2021-11-07 08:00:05,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 381 states. [2021-11-07 08:00:05,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 381 to 318. [2021-11-07 08:00:05,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 318 states, 307 states have (on average 1.1596091205211727) internal successors, (356), 311 states have internal predecessors, (356), 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 08:00:05,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 362 transitions. [2021-11-07 08:00:05,875 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 362 transitions. Word has length 67 [2021-11-07 08:00:05,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:00:05,875 INFO L470 AbstractCegarLoop]: Abstraction has 318 states and 362 transitions. [2021-11-07 08:00:05,876 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 39 states have (on average 3.076923076923077) internal successors, (120), 37 states have internal predecessors, (120), 3 states have call successors, (5), 4 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 08:00:05,876 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 362 transitions. [2021-11-07 08:00:05,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 08:00:05,877 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:00:05,877 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-11-07 08:00:05,910 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-07 08:00:06,096 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:00:06,096 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting subseqErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:00:06,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:00:06,097 INFO L85 PathProgramCache]: Analyzing trace with hash -1670185062, now seen corresponding path program 4 times [2021-11-07 08:00:06,097 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:00:06,097 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1968738688] [2021-11-07 08:00:06,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:00:06,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:00:06,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:06,313 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:00:06,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:06,318 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 1 proven. 47 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 08:00:06,318 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:00:06,318 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1968738688] [2021-11-07 08:00:06,319 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1968738688] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:00:06,319 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1427913488] [2021-11-07 08:00:06,319 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 08:00:06,319 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:00:06,319 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:00:06,320 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:00:06,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-07 08:00:06,834 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 08:00:06,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:00:06,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-07 08:00:06,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:00:06,889 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 08:00:06,897 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 08:00:07,491 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 08:00:07,539 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-07 08:00:07,539 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 08:00:08,560 INFO L354 Elim1Store]: treesize reduction 39, result has 23.5 percent of original size [2021-11-07 08:00:08,561 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 08:00:08,867 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 08:00:08,868 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1427913488] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:00:08,868 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:00:08,868 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 27 [2021-11-07 08:00:08,868 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192737961] [2021-11-07 08:00:08,869 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-07 08:00:08,869 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:00:08,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-07 08:00:08,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=691, Unknown=0, NotChecked=0, Total=756 [2021-11-07 08:00:08,870 INFO L87 Difference]: Start difference. First operand 318 states and 362 transitions. Second operand has 28 states, 26 states have (on average 4.384615384615385) internal successors, (114), 25 states have internal predecessors, (114), 3 states have call successors, (5), 4 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 08:00:11,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:00:11,901 INFO L93 Difference]: Finished difference Result 409 states and 439 transitions. [2021-11-07 08:00:11,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-07 08:00:11,901 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 4.384615384615385) internal successors, (114), 25 states have internal predecessors, (114), 3 states have call successors, (5), 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 08:00:11,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:00:11,903 INFO L225 Difference]: With dead ends: 409 [2021-11-07 08:00:11,904 INFO L226 Difference]: Without dead ends: 409 [2021-11-07 08:00:11,905 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=253, Invalid=2003, Unknown=0, NotChecked=0, Total=2256 [2021-11-07 08:00:11,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409 states. [2021-11-07 08:00:11,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409 to 328. [2021-11-07 08:00:11,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 317 states have (on average 1.16403785488959) internal successors, (369), 321 states have internal predecessors, (369), 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 08:00:11,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 375 transitions. [2021-11-07 08:00:11,915 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 375 transitions. Word has length 71 [2021-11-07 08:00:11,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:00:11,916 INFO L470 AbstractCegarLoop]: Abstraction has 328 states and 375 transitions. [2021-11-07 08:00:11,916 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 4.384615384615385) internal successors, (114), 25 states have internal predecessors, (114), 3 states have call successors, (5), 4 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 08:00:11,916 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 375 transitions. [2021-11-07 08:00:11,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-07 08:00:11,917 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:00:11,918 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 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 08:00:11,958 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-07 08:00:12,140 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-07 08:00:12,140 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting subseqErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:00:12,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:00:12,141 INFO L85 PathProgramCache]: Analyzing trace with hash 170806983, now seen corresponding path program 4 times [2021-11-07 08:00:12,141 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:00:12,141 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [867995237] [2021-11-07 08:00:12,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:00:12,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:00:12,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:12,376 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:00:12,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:12,380 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 28 proven. 63 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:00:12,380 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:00:12,380 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [867995237] [2021-11-07 08:00:12,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [867995237] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:00:12,381 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1349635137] [2021-11-07 08:00:12,381 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 08:00:12,381 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:00:12,381 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:00:12,384 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:00:12,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-07 08:00:13,004 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 08:00:13,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:00:13,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-07 08:00:13,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:00:13,043 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:00:13,044 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 08:00:13,445 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 08:00:14,087 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-11-07 08:00:14,088 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 08:00:14,122 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 70 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:00:14,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1349635137] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:00:14,123 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:00:14,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 31 [2021-11-07 08:00:14,124 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724141916] [2021-11-07 08:00:14,124 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-07 08:00:14,124 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:00:14,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-07 08:00:14,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=836, Unknown=0, NotChecked=0, Total=930 [2021-11-07 08:00:14,126 INFO L87 Difference]: Start difference. First operand 328 states and 375 transitions. Second operand has 31 states, 29 states have (on average 4.482758620689655) internal successors, (130), 28 states have internal predecessors, (130), 3 states have call successors, (5), 4 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 08:00:15,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:00:15,168 INFO L93 Difference]: Finished difference Result 520 states and 573 transitions. [2021-11-07 08:00:15,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-07 08:00:15,168 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 4.482758620689655) internal successors, (130), 28 states have internal predecessors, (130), 3 states have call successors, (5), 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 76 [2021-11-07 08:00:15,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:00:15,170 INFO L225 Difference]: With dead ends: 520 [2021-11-07 08:00:15,171 INFO L226 Difference]: Without dead ends: 349 [2021-11-07 08:00:15,172 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 429 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=238, Invalid=1832, Unknown=0, NotChecked=0, Total=2070 [2021-11-07 08:00:15,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2021-11-07 08:00:15,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 340. [2021-11-07 08:00:15,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 340 states, 329 states have (on average 1.1580547112462005) internal successors, (381), 333 states have internal predecessors, (381), 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 08:00:15,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 340 states to 340 states and 387 transitions. [2021-11-07 08:00:15,184 INFO L78 Accepts]: Start accepts. Automaton has 340 states and 387 transitions. Word has length 76 [2021-11-07 08:00:15,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:00:15,184 INFO L470 AbstractCegarLoop]: Abstraction has 340 states and 387 transitions. [2021-11-07 08:00:15,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 4.482758620689655) internal successors, (130), 28 states have internal predecessors, (130), 3 states have call successors, (5), 4 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 08:00:15,185 INFO L276 IsEmpty]: Start isEmpty. Operand 340 states and 387 transitions. [2021-11-07 08:00:15,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-07 08:00:15,186 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:00:15,187 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 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 08:00:15,238 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-07 08:00:15,408 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:00:15,409 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting subseqErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:00:15,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:00:15,409 INFO L85 PathProgramCache]: Analyzing trace with hash 596793124, now seen corresponding path program 5 times [2021-11-07 08:00:15,409 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:00:15,409 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1307924842] [2021-11-07 08:00:15,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:00:15,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:00:15,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:15,723 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:00:15,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:15,735 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 6 proven. 98 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:00:15,736 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:00:15,736 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1307924842] [2021-11-07 08:00:15,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1307924842] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:00:15,736 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [195214702] [2021-11-07 08:00:15,736 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 08:00:15,736 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:00:15,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:00:15,737 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:00:15,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-07 08:00:16,499 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-07 08:00:16,499 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:00:16,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-07 08:00:16,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:00:16,552 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:00:16,552 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 08:00:17,312 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 15 proven. 89 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:00:17,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [195214702] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:00:17,313 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:00:17,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 20 [2021-11-07 08:00:17,313 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079209763] [2021-11-07 08:00:17,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-07 08:00:17,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:00:17,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-07 08:00:17,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2021-11-07 08:00:17,315 INFO L87 Difference]: Start difference. First operand 340 states and 387 transitions. Second operand has 21 states, 20 states have (on average 6.2) internal successors, (124), 19 states have internal predecessors, (124), 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 08:00:17,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:00:17,948 INFO L93 Difference]: Finished difference Result 432 states and 505 transitions. [2021-11-07 08:00:17,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-07 08:00:17,948 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 6.2) internal successors, (124), 19 states have internal predecessors, (124), 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 80 [2021-11-07 08:00:17,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:00:17,950 INFO L225 Difference]: With dead ends: 432 [2021-11-07 08:00:17,950 INFO L226 Difference]: Without dead ends: 426 [2021-11-07 08:00:17,951 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=104, Invalid=652, Unknown=0, NotChecked=0, Total=756 [2021-11-07 08:00:17,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 426 states. [2021-11-07 08:00:17,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 426 to 409. [2021-11-07 08:00:17,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 409 states, 398 states have (on average 1.1482412060301508) internal successors, (457), 402 states have internal predecessors, (457), 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 08:00:17,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 463 transitions. [2021-11-07 08:00:17,964 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 463 transitions. Word has length 80 [2021-11-07 08:00:17,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:00:17,964 INFO L470 AbstractCegarLoop]: Abstraction has 409 states and 463 transitions. [2021-11-07 08:00:17,965 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 6.2) internal successors, (124), 19 states have internal predecessors, (124), 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 08:00:17,965 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 463 transitions. [2021-11-07 08:00:17,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-07 08:00:17,966 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:00:17,967 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 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] [2021-11-07 08:00:18,000 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-07 08:00:18,176 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:00:18,176 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting subseqErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:00:18,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:00:18,177 INFO L85 PathProgramCache]: Analyzing trace with hash -797846678, now seen corresponding path program 5 times [2021-11-07 08:00:18,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:00:18,177 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [720824440] [2021-11-07 08:00:18,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:00:18,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:00:18,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:18,916 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:00:18,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:18,920 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 25 proven. 82 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:00:18,920 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:00:18,920 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [720824440] [2021-11-07 08:00:18,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [720824440] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:00:18,921 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [670811025] [2021-11-07 08:00:18,921 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 08:00:18,921 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:00:18,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:00:18,924 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:00:18,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-07 08:00:19,839 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-07 08:00:19,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:00:19,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-07 08:00:19,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:00:19,890 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 08:00:19,901 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 08:00:20,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 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 08:00:20,655 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 08:00:21,739 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [subseq_~pt~0.base] [2021-11-07 08:00:21,739 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-07 08:00:21,739 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2021-11-07 08:00:21,739 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1825451605] [2021-11-07 08:00:21,740 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-07 08:00:21,740 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:00:21,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-07 08:00:21,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=923, Unknown=0, NotChecked=0, Total=992 [2021-11-07 08:00:21,741 INFO L87 Difference]: Start difference. First operand 409 states and 463 transitions. Second operand has 21 states, 21 states have (on average 3.857142857142857) internal successors, (81), 19 states have internal predecessors, (81), 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 08:00:22,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:00:22,954 INFO L93 Difference]: Finished difference Result 617 states and 685 transitions. [2021-11-07 08:00:22,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-07 08:00:22,957 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.857142857142857) internal successors, (81), 19 states have internal predecessors, (81), 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 85 [2021-11-07 08:00:22,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:00:22,959 INFO L225 Difference]: With dead ends: 617 [2021-11-07 08:00:22,959 INFO L226 Difference]: Without dead ends: 609 [2021-11-07 08:00:22,960 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 345 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=186, Invalid=2264, Unknown=0, NotChecked=0, Total=2450 [2021-11-07 08:00:22,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 609 states. [2021-11-07 08:00:22,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 609 to 493. [2021-11-07 08:00:22,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 481 states have (on average 1.1455301455301454) internal successors, (551), 485 states have internal predecessors, (551), 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 08:00:22,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 558 transitions. [2021-11-07 08:00:22,974 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 558 transitions. Word has length 85 [2021-11-07 08:00:22,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:00:22,974 INFO L470 AbstractCegarLoop]: Abstraction has 493 states and 558 transitions. [2021-11-07 08:00:22,975 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.857142857142857) internal successors, (81), 19 states have internal predecessors, (81), 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 08:00:22,975 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 558 transitions. [2021-11-07 08:00:22,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-07 08:00:22,976 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:00:22,977 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 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] [2021-11-07 08:00:23,019 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-07 08:00:23,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-07 08:00:23,192 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting subseqErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:00:23,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:00:23,192 INFO L85 PathProgramCache]: Analyzing trace with hash -1817796499, now seen corresponding path program 6 times [2021-11-07 08:00:23,193 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:00:23,193 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1230756634] [2021-11-07 08:00:23,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:00:23,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:00:23,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:23,452 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:00:23,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:23,455 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 6 proven. 86 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 08:00:23,456 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:00:23,456 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1230756634] [2021-11-07 08:00:23,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1230756634] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:00:23,456 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [602662574] [2021-11-07 08:00:23,456 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-07 08:00:23,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:00:23,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:00:23,460 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:00:23,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-07 08:00:24,505 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-07 08:00:24,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:00:24,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 343 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-07 08:00:24,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:00:24,545 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-07 08:00:24,546 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 08:00:24,548 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 08:00:25,277 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 15 proven. 77 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 08:00:25,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [602662574] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:00:25,277 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:00:25,277 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 26 [2021-11-07 08:00:25,277 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631963159] [2021-11-07 08:00:25,278 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-07 08:00:25,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:00:25,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-07 08:00:25,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-11-07 08:00:25,279 INFO L87 Difference]: Start difference. First operand 493 states and 558 transitions. Second operand has 27 states, 26 states have (on average 5.461538461538462) internal successors, (142), 24 states have internal predecessors, (142), 3 states have call successors, (5), 4 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 08:00:26,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:00:26,531 INFO L93 Difference]: Finished difference Result 533 states and 583 transitions. [2021-11-07 08:00:26,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-07 08:00:26,531 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 5.461538461538462) internal successors, (142), 24 states have internal predecessors, (142), 3 states have call successors, (5), 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 89 [2021-11-07 08:00:26,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:00:26,533 INFO L225 Difference]: With dead ends: 533 [2021-11-07 08:00:26,534 INFO L226 Difference]: Without dead ends: 533 [2021-11-07 08:00:26,534 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=175, Invalid=1231, Unknown=0, NotChecked=0, Total=1406 [2021-11-07 08:00:26,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2021-11-07 08:00:26,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 503. [2021-11-07 08:00:26,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 503 states, 491 states have (on average 1.1486761710794298) internal successors, (564), 495 states have internal predecessors, (564), 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 08:00:26,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 503 states to 503 states and 571 transitions. [2021-11-07 08:00:26,549 INFO L78 Accepts]: Start accepts. Automaton has 503 states and 571 transitions. Word has length 89 [2021-11-07 08:00:26,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:00:26,549 INFO L470 AbstractCegarLoop]: Abstraction has 503 states and 571 transitions. [2021-11-07 08:00:26,549 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 5.461538461538462) internal successors, (142), 24 states have internal predecessors, (142), 3 states have call successors, (5), 4 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 08:00:26,550 INFO L276 IsEmpty]: Start isEmpty. Operand 503 states and 571 transitions. [2021-11-07 08:00:26,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-07 08:00:26,551 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:00:26,551 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 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 08:00:26,581 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-07 08:00:26,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-07 08:00:26,772 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting subseqErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:00:26,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:00:26,772 INFO L85 PathProgramCache]: Analyzing trace with hash 1065489845, now seen corresponding path program 6 times [2021-11-07 08:00:26,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:00:26,773 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1221579841] [2021-11-07 08:00:26,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:00:26,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:00:26,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:27,048 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:00:27,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:27,052 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 36 proven. 112 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:00:27,052 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:00:27,052 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1221579841] [2021-11-07 08:00:27,052 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1221579841] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:00:27,052 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [954877196] [2021-11-07 08:00:27,052 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-07 08:00:27,053 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:00:27,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:00:27,056 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:00:27,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-07 08:00:28,071 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-11-07 08:00:28,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:00:28,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-07 08:00:28,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:00:28,290 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 08:00:28,604 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 08:00:28,624 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 36 proven. 112 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:00:28,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [954877196] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:00:28,625 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:00:28,625 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18] total 30 [2021-11-07 08:00:28,626 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720581772] [2021-11-07 08:00:28,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-07 08:00:28,626 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:00:28,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-07 08:00:28,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=792, Unknown=0, NotChecked=0, Total=870 [2021-11-07 08:00:28,628 INFO L87 Difference]: Start difference. First operand 503 states and 571 transitions. Second operand has 30 states, 28 states have (on average 4.428571428571429) internal successors, (124), 27 states have internal predecessors, (124), 3 states have call successors, (5), 4 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 08:00:29,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:00:29,936 INFO L93 Difference]: Finished difference Result 819 states and 901 transitions. [2021-11-07 08:00:29,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-07 08:00:29,937 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 28 states have (on average 4.428571428571429) internal successors, (124), 27 states have internal predecessors, (124), 3 states have call successors, (5), 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 08:00:29,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:00:29,940 INFO L225 Difference]: With dead ends: 819 [2021-11-07 08:00:29,941 INFO L226 Difference]: Without dead ends: 531 [2021-11-07 08:00:29,941 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 373 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=170, Invalid=1552, Unknown=0, NotChecked=0, Total=1722 [2021-11-07 08:00:29,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 531 states. [2021-11-07 08:00:29,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 531 to 519. [2021-11-07 08:00:29,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 519 states, 507 states have (on average 1.143984220907298) internal successors, (580), 511 states have internal predecessors, (580), 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 08:00:29,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 519 states to 519 states and 587 transitions. [2021-11-07 08:00:29,958 INFO L78 Accepts]: Start accepts. Automaton has 519 states and 587 transitions. Word has length 90 [2021-11-07 08:00:29,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:00:29,958 INFO L470 AbstractCegarLoop]: Abstraction has 519 states and 587 transitions. [2021-11-07 08:00:29,958 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 28 states have (on average 4.428571428571429) internal successors, (124), 27 states have internal predecessors, (124), 3 states have call successors, (5), 4 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 08:00:29,959 INFO L276 IsEmpty]: Start isEmpty. Operand 519 states and 587 transitions. [2021-11-07 08:00:29,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-07 08:00:29,961 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:00:29,961 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 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, 1, 1] [2021-11-07 08:00:30,007 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-07 08:00:30,174 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-07 08:00:30,174 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting subseqErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:00:30,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:00:30,175 INFO L85 PathProgramCache]: Analyzing trace with hash -1712474286, now seen corresponding path program 7 times [2021-11-07 08:00:30,175 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:00:30,175 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [656494776] [2021-11-07 08:00:30,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:00:30,175 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:00:30,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:30,681 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:00:30,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:30,688 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 15 proven. 150 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:00:30,688 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:00:30,688 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [656494776] [2021-11-07 08:00:30,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [656494776] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:00:30,688 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1031477395] [2021-11-07 08:00:30,688 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 08:00:30,689 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:00:30,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:00:30,689 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:00:30,691 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-07 08:00:31,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:31,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-07 08:00:31,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:00:32,148 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 28 proven. 137 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:00:32,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1031477395] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:00:32,149 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:00:32,149 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 27 [2021-11-07 08:00:32,149 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576149250] [2021-11-07 08:00:32,150 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-07 08:00:32,150 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:00:32,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-07 08:00:32,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=658, Unknown=0, NotChecked=0, Total=756 [2021-11-07 08:00:32,151 INFO L87 Difference]: Start difference. First operand 519 states and 587 transitions. Second operand has 28 states, 25 states have (on average 5.28) internal successors, (132), 25 states have internal predecessors, (132), 3 states have call successors, (5), 4 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 08:00:32,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:00:32,976 INFO L93 Difference]: Finished difference Result 635 states and 737 transitions. [2021-11-07 08:00:32,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-07 08:00:32,977 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 25 states have (on average 5.28) internal successors, (132), 25 states have internal predecessors, (132), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 94 [2021-11-07 08:00:32,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:00:32,982 INFO L225 Difference]: With dead ends: 635 [2021-11-07 08:00:32,982 INFO L226 Difference]: Without dead ends: 629 [2021-11-07 08:00:32,983 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 321 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=163, Invalid=1097, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 08:00:32,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 629 states. [2021-11-07 08:00:32,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 629 to 608. [2021-11-07 08:00:32,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 608 states, 596 states have (on average 1.1375838926174497) internal successors, (678), 600 states have internal predecessors, (678), 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 08:00:33,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 608 states to 608 states and 685 transitions. [2021-11-07 08:00:33,000 INFO L78 Accepts]: Start accepts. Automaton has 608 states and 685 transitions. Word has length 94 [2021-11-07 08:00:33,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:00:33,001 INFO L470 AbstractCegarLoop]: Abstraction has 608 states and 685 transitions. [2021-11-07 08:00:33,001 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 25 states have (on average 5.28) internal successors, (132), 25 states have internal predecessors, (132), 3 states have call successors, (5), 4 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 08:00:33,001 INFO L276 IsEmpty]: Start isEmpty. Operand 608 states and 685 transitions. [2021-11-07 08:00:33,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-07 08:00:33,004 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:00:33,004 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 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] [2021-11-07 08:00:33,054 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-07 08:00:33,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-07 08:00:33,223 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting subseqErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:00:33,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:00:33,223 INFO L85 PathProgramCache]: Analyzing trace with hash -1907843651, now seen corresponding path program 7 times [2021-11-07 08:00:33,223 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:00:33,224 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788087646] [2021-11-07 08:00:33,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:00:33,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:00:33,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:34,054 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:00:34,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:34,060 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 33 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:00:34,060 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:00:34,060 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788087646] [2021-11-07 08:00:34,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1788087646] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:00:34,061 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1883883707] [2021-11-07 08:00:34,061 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 08:00:34,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:00:34,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:00:34,062 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:00:34,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-07 08:00:35,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:00:35,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 392 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-07 08:00:35,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:00:35,097 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 08:00:35,590 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 08:00:35,652 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-07 08:00:35,653 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 08:00:36,991 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-07 08:00:36,991 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 08:00:37,012 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 33 proven. 100 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 08:00:37,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1883883707] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:00:37,013 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:00:37,013 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 19] total 39 [2021-11-07 08:00:37,013 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560611317] [2021-11-07 08:00:37,014 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-07 08:00:37,014 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:00:37,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-07 08:00:37,015 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=1382, Unknown=0, NotChecked=0, Total=1482 [2021-11-07 08:00:37,015 INFO L87 Difference]: Start difference. First operand 608 states and 685 transitions. Second operand has 39 states, 38 states have (on average 4.421052631578948) internal successors, (168), 36 states have internal predecessors, (168), 3 states have call successors, (5), 4 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 08:01:19,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:01:19,592 INFO L93 Difference]: Finished difference Result 894 states and 992 transitions. [2021-11-07 08:01:19,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-07 08:01:19,593 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 4.421052631578948) internal successors, (168), 36 states have internal predecessors, (168), 3 states have call successors, (5), 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 103 [2021-11-07 08:01:19,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:01:19,598 INFO L225 Difference]: With dead ends: 894 [2021-11-07 08:01:19,598 INFO L226 Difference]: Without dead ends: 886 [2021-11-07 08:01:19,600 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 633 ImplicationChecksByTransitivity, 41.5s TimeCoverageRelationStatistics Valid=290, Invalid=3370, Unknown=0, NotChecked=0, Total=3660 [2021-11-07 08:01:19,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 886 states. [2021-11-07 08:01:19,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 886 to 706. [2021-11-07 08:01:19,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 706 states, 693 states have (on average 1.1356421356421356) internal successors, (787), 697 states have internal predecessors, (787), 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 08:01:19,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 706 states to 706 states and 795 transitions. [2021-11-07 08:01:19,620 INFO L78 Accepts]: Start accepts. Automaton has 706 states and 795 transitions. Word has length 103 [2021-11-07 08:01:19,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:01:19,621 INFO L470 AbstractCegarLoop]: Abstraction has 706 states and 795 transitions. [2021-11-07 08:01:19,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 4.421052631578948) internal successors, (168), 36 states have internal predecessors, (168), 3 states have call successors, (5), 4 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 08:01:19,621 INFO L276 IsEmpty]: Start isEmpty. Operand 706 states and 795 transitions. [2021-11-07 08:01:19,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-07 08:01:19,624 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:01:19,625 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 7, 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 08:01:19,672 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-07 08:01:19,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-07 08:01:19,844 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting subseqErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:01:19,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:01:19,845 INFO L85 PathProgramCache]: Analyzing trace with hash 1144886371, now seen corresponding path program 8 times [2021-11-07 08:01:19,845 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:01:19,845 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1762260656] [2021-11-07 08:01:19,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:01:19,845 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:01:19,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:01:20,210 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:01:20,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:01:20,222 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 44 proven. 175 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:01:20,222 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:01:20,222 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1762260656] [2021-11-07 08:01:20,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1762260656] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:01:20,222 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1884575670] [2021-11-07 08:01:20,222 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 08:01:20,223 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:01:20,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:01:20,224 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:01:20,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-07 08:01:21,287 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 08:01:21,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:01:21,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 375 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-07 08:01:21,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:01:21,571 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 08:01:22,053 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 08:01:22,082 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 44 proven. 175 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:01:22,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1884575670] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:01:22,083 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:01:22,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 20] total 33 [2021-11-07 08:01:22,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091372335] [2021-11-07 08:01:22,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-07 08:01:22,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:01:22,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-07 08:01:22,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=970, Unknown=0, NotChecked=0, Total=1056 [2021-11-07 08:01:22,086 INFO L87 Difference]: Start difference. First operand 706 states and 795 transitions. Second operand has 33 states, 31 states have (on average 4.580645161290323) internal successors, (142), 30 states have internal predecessors, (142), 3 states have call successors, (5), 4 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 08:01:23,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:01:23,592 INFO L93 Difference]: Finished difference Result 1177 states and 1291 transitions. [2021-11-07 08:01:23,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-07 08:01:23,592 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 4.580645161290323) internal successors, (142), 30 states have internal predecessors, (142), 3 states have call successors, (5), 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 104 [2021-11-07 08:01:23,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:01:23,597 INFO L225 Difference]: With dead ends: 1177 [2021-11-07 08:01:23,597 INFO L226 Difference]: Without dead ends: 797 [2021-11-07 08:01:23,598 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=185, Invalid=1885, Unknown=0, NotChecked=0, Total=2070 [2021-11-07 08:01:23,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 797 states. [2021-11-07 08:01:23,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 797 to 781. [2021-11-07 08:01:23,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 781 states, 767 states have (on average 1.1238591916558018) internal successors, (862), 771 states have internal predecessors, (862), 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 08:01:23,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 781 states to 781 states and 871 transitions. [2021-11-07 08:01:23,615 INFO L78 Accepts]: Start accepts. Automaton has 781 states and 871 transitions. Word has length 104 [2021-11-07 08:01:23,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:01:23,616 INFO L470 AbstractCegarLoop]: Abstraction has 781 states and 871 transitions. [2021-11-07 08:01:23,616 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 4.580645161290323) internal successors, (142), 30 states have internal predecessors, (142), 3 states have call successors, (5), 4 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 08:01:23,616 INFO L276 IsEmpty]: Start isEmpty. Operand 781 states and 871 transitions. [2021-11-07 08:01:23,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-07 08:01:23,620 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:01:23,620 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 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] [2021-11-07 08:01:23,656 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-07 08:01:23,836 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-07 08:01:23,836 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting subseqErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:01:23,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:01:23,837 INFO L85 PathProgramCache]: Analyzing trace with hash 1170427904, now seen corresponding path program 8 times [2021-11-07 08:01:23,837 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:01:23,837 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207609175] [2021-11-07 08:01:23,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:01:23,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:01:23,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:01:24,147 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:01:24,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:01:24,151 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 15 proven. 135 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 08:01:24,151 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:01:24,151 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207609175] [2021-11-07 08:01:24,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207609175] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:01:24,152 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [906714979] [2021-11-07 08:01:24,152 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 08:01:24,152 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:01:24,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:01:24,153 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:01:24,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-07 08:01:25,337 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 08:01:25,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:01:25,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-07 08:01:25,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:01:26,028 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 28 proven. 122 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-07 08:01:26,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [906714979] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:01:26,028 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:01:26,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 26 [2021-11-07 08:01:26,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686012682] [2021-11-07 08:01:26,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-07 08:01:26,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:01:26,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-07 08:01:26,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=614, Unknown=0, NotChecked=0, Total=702 [2021-11-07 08:01:26,030 INFO L87 Difference]: Start difference. First operand 781 states and 871 transitions. Second operand has 27 states, 26 states have (on average 4.923076923076923) internal successors, (128), 24 states have internal predecessors, (128), 3 states have call successors, (5), 4 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 08:01:27,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:01:27,242 INFO L93 Difference]: Finished difference Result 826 states and 897 transitions. [2021-11-07 08:01:27,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-07 08:01:27,242 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 4.923076923076923) internal successors, (128), 24 states have internal predecessors, (128), 3 states have call successors, (5), 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 08:01:27,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:01:27,246 INFO L225 Difference]: With dead ends: 826 [2021-11-07 08:01:27,246 INFO L226 Difference]: Without dead ends: 771 [2021-11-07 08:01:27,247 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=166, Invalid=1094, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 08:01:27,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 771 states. [2021-11-07 08:01:27,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 771 to 736. [2021-11-07 08:01:27,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 736 states, 723 states have (on average 1.1341632088520055) internal successors, (820), 727 states have internal predecessors, (820), 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 08:01:27,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 736 states to 736 states and 828 transitions. [2021-11-07 08:01:27,280 INFO L78 Accepts]: Start accepts. Automaton has 736 states and 828 transitions. Word has length 107 [2021-11-07 08:01:27,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:01:27,280 INFO L470 AbstractCegarLoop]: Abstraction has 736 states and 828 transitions. [2021-11-07 08:01:27,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 4.923076923076923) internal successors, (128), 24 states have internal predecessors, (128), 3 states have call successors, (5), 4 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 08:01:27,281 INFO L276 IsEmpty]: Start isEmpty. Operand 736 states and 828 transitions. [2021-11-07 08:01:27,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-07 08:01:27,284 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:01:27,284 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 7, 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 08:01:27,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-07 08:01:27,508 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-07 08:01:27,508 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting subseqErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:01:27,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:01:27,509 INFO L85 PathProgramCache]: Analyzing trace with hash -1597268160, now seen corresponding path program 9 times [2021-11-07 08:01:27,509 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:01:27,509 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1423117807] [2021-11-07 08:01:27,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:01:27,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:01:27,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:01:27,941 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:01:27,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:01:27,946 INFO L134 CoverageAnalysis]: Checked inductivity of 241 backedges. 28 proven. 212 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:01:27,946 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:01:27,946 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1423117807] [2021-11-07 08:01:27,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1423117807] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:01:27,947 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1836252937] [2021-11-07 08:01:27,947 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 08:01:27,947 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:01:27,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:01:27,948 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:01:27,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-07 08:01:29,486 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-07 08:01:29,486 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:01:29,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 386 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-07 08:01:29,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:01:30,120 INFO L134 CoverageAnalysis]: Checked inductivity of 241 backedges. 45 proven. 195 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:01:30,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1836252937] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:01:30,121 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:01:30,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 36 [2021-11-07 08:01:30,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346184683] [2021-11-07 08:01:30,121 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-07 08:01:30,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:01:30,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-07 08:01:30,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=1154, Unknown=0, NotChecked=0, Total=1332 [2021-11-07 08:01:30,123 INFO L87 Difference]: Start difference. First operand 736 states and 828 transitions. Second operand has 37 states, 34 states have (on average 6.0) internal successors, (204), 34 states have internal predecessors, (204), 3 states have call successors, (5), 4 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 08:01:30,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:01:30,949 INFO L93 Difference]: Finished difference Result 876 states and 1010 transitions. [2021-11-07 08:01:30,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-07 08:01:30,956 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 6.0) internal successors, (204), 34 states have internal predecessors, (204), 3 states have call successors, (5), 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 108 [2021-11-07 08:01:30,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:01:30,961 INFO L225 Difference]: With dead ends: 876 [2021-11-07 08:01:30,961 INFO L226 Difference]: Without dead ends: 870 [2021-11-07 08:01:30,962 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 534 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=283, Invalid=1787, Unknown=0, NotChecked=0, Total=2070 [2021-11-07 08:01:30,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 870 states. [2021-11-07 08:01:30,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 870 to 845. [2021-11-07 08:01:30,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 845 states, 832 states have (on average 1.1298076923076923) internal successors, (940), 836 states have internal predecessors, (940), 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 08:01:30,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 845 states to 845 states and 948 transitions. [2021-11-07 08:01:30,988 INFO L78 Accepts]: Start accepts. Automaton has 845 states and 948 transitions. Word has length 108 [2021-11-07 08:01:30,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:01:30,989 INFO L470 AbstractCegarLoop]: Abstraction has 845 states and 948 transitions. [2021-11-07 08:01:30,989 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 34 states have (on average 6.0) internal successors, (204), 34 states have internal predecessors, (204), 3 states have call successors, (5), 4 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 08:01:30,989 INFO L276 IsEmpty]: Start isEmpty. Operand 845 states and 948 transitions. [2021-11-07 08:01:30,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-07 08:01:30,992 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:01:30,993 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 8, 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, 1, 1] [2021-11-07 08:01:31,037 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-07 08:01:31,212 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:01:31,212 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting subseqErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:01:31,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:01:31,212 INFO L85 PathProgramCache]: Analyzing trace with hash -456856879, now seen corresponding path program 10 times [2021-11-07 08:01:31,213 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:01:31,213 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1875942171] [2021-11-07 08:01:31,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:01:31,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:01:31,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:01:31,676 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:01:31,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:01:31,681 INFO L134 CoverageAnalysis]: Checked inductivity of 305 backedges. 52 proven. 252 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:01:31,681 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:01:31,681 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1875942171] [2021-11-07 08:01:31,681 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1875942171] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:01:31,681 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [730959525] [2021-11-07 08:01:31,681 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 08:01:31,682 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:01:31,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:01:31,684 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:01:31,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-07 08:01:32,991 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 08:01:32,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:01:32,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 390 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-07 08:01:32,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:01:33,039 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:01:33,039 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 08:01:33,670 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 08:01:34,643 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-11-07 08:01:34,644 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 08:01:34,665 INFO L134 CoverageAnalysis]: Checked inductivity of 305 backedges. 226 proven. 78 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:01:34,666 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [730959525] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:01:34,666 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:01:34,666 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 43 [2021-11-07 08:01:34,666 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494031119] [2021-11-07 08:01:34,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-07 08:01:34,666 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:01:34,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-07 08:01:34,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1646, Unknown=0, NotChecked=0, Total=1806 [2021-11-07 08:01:34,667 INFO L87 Difference]: Start difference. First operand 845 states and 948 transitions. Second operand has 43 states, 41 states have (on average 5.219512195121951) internal successors, (214), 40 states have internal predecessors, (214), 3 states have call successors, (5), 4 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 08:01:36,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:01:36,264 INFO L93 Difference]: Finished difference Result 1423 states and 1559 transitions. [2021-11-07 08:01:36,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-07 08:01:36,273 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 41 states have (on average 5.219512195121951) internal successors, (214), 40 states have internal predecessors, (214), 3 states have call successors, (5), 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 118 [2021-11-07 08:01:36,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:01:36,278 INFO L225 Difference]: With dead ends: 1423 [2021-11-07 08:01:36,278 INFO L226 Difference]: Without dead ends: 946 [2021-11-07 08:01:36,280 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 900 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=385, Invalid=3647, Unknown=0, NotChecked=0, Total=4032 [2021-11-07 08:01:36,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 946 states. [2021-11-07 08:01:36,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 946 to 930. [2021-11-07 08:01:36,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 930 states, 916 states have (on average 1.1189956331877728) internal successors, (1025), 920 states have internal predecessors, (1025), 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 08:01:36,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 930 states to 930 states and 1034 transitions. [2021-11-07 08:01:36,298 INFO L78 Accepts]: Start accepts. Automaton has 930 states and 1034 transitions. Word has length 118 [2021-11-07 08:01:36,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:01:36,298 INFO L470 AbstractCegarLoop]: Abstraction has 930 states and 1034 transitions. [2021-11-07 08:01:36,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 41 states have (on average 5.219512195121951) internal successors, (214), 40 states have internal predecessors, (214), 3 states have call successors, (5), 4 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 08:01:36,299 INFO L276 IsEmpty]: Start isEmpty. Operand 930 states and 1034 transitions. [2021-11-07 08:01:36,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-07 08:01:36,302 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:01:36,302 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 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] [2021-11-07 08:01:36,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-07 08:01:36,516 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:01:36,516 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting subseqErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:01:36,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:01:36,517 INFO L85 PathProgramCache]: Analyzing trace with hash 694826704, now seen corresponding path program 9 times [2021-11-07 08:01:36,517 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:01:36,517 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1916854788] [2021-11-07 08:01:36,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:01:36,517 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:01:36,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:01:37,442 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:01:37,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:01:37,454 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 41 proven. 226 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:01:37,455 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:01:37,455 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1916854788] [2021-11-07 08:01:37,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1916854788] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:01:37,455 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2060231960] [2021-11-07 08:01:37,456 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 08:01:37,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:01:37,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:01:37,460 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:01:37,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-07 08:01:39,279 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-07 08:01:39,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:01:39,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 452 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-07 08:01:39,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:01:39,319 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:01:39,320 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 08:01:39,327 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 08:01:39,995 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 23 treesize of output 19 [2021-11-07 08:01:40,068 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-07 08:01:40,068 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 08:01:44,185 INFO L354 Elim1Store]: treesize reduction 42, result has 57.6 percent of original size [2021-11-07 08:01:44,186 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 57 treesize of output 83 [2021-11-07 08:01:44,388 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 20 proven. 16 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-11-07 08:01:44,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2060231960] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:01:44,388 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:01:44,388 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 12] total 38 [2021-11-07 08:01:44,388 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106366781] [2021-11-07 08:01:44,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-07 08:01:44,389 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:01:44,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-07 08:01:44,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1321, Unknown=0, NotChecked=0, Total=1406 [2021-11-07 08:01:44,390 INFO L87 Difference]: Start difference. First operand 930 states and 1034 transitions. Second operand has 38 states, 37 states have (on average 4.081081081081081) internal successors, (151), 35 states have internal predecessors, (151), 3 states have call successors, (5), 4 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 08:02:11,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:02:11,866 INFO L93 Difference]: Finished difference Result 1572 states and 1724 transitions. [2021-11-07 08:02:11,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-11-07 08:02:11,867 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 4.081081081081081) internal successors, (151), 35 states have internal predecessors, (151), 3 states have call successors, (5), 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 121 [2021-11-07 08:02:11,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:02:11,873 INFO L225 Difference]: With dead ends: 1572 [2021-11-07 08:02:11,873 INFO L226 Difference]: Without dead ends: 1442 [2021-11-07 08:02:11,875 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 112 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3658 ImplicationChecksByTransitivity, 26.6s TimeCoverageRelationStatistics Valid=1086, Invalid=12956, Unknown=0, NotChecked=0, Total=14042 [2021-11-07 08:02:11,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1442 states. [2021-11-07 08:02:11,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1442 to 715. [2021-11-07 08:02:11,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 715 states, 703 states have (on average 1.1024182076813656) internal successors, (775), 705 states have internal predecessors, (775), 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 08:02:11,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 715 states to 715 states and 784 transitions. [2021-11-07 08:02:11,898 INFO L78 Accepts]: Start accepts. Automaton has 715 states and 784 transitions. Word has length 121 [2021-11-07 08:02:11,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:02:11,899 INFO L470 AbstractCegarLoop]: Abstraction has 715 states and 784 transitions. [2021-11-07 08:02:11,899 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 4.081081081081081) internal successors, (151), 35 states have internal predecessors, (151), 3 states have call successors, (5), 4 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 08:02:11,899 INFO L276 IsEmpty]: Start isEmpty. Operand 715 states and 784 transitions. [2021-11-07 08:02:11,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-07 08:02:11,903 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:02:11,903 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:02:11,959 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-07 08:02:12,120 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-11-07 08:02:12,120 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting subseqErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:02:12,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:02:12,121 INFO L85 PathProgramCache]: Analyzing trace with hash 1432628974, now seen corresponding path program 11 times [2021-11-07 08:02:12,121 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:02:12,121 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1459323658] [2021-11-07 08:02:12,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:02:12,121 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:02:12,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:02:12,538 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:02:12,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:02:12,543 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 45 proven. 284 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:02:12,543 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:02:12,543 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1459323658] [2021-11-07 08:02:12,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1459323658] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:02:12,544 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [194883315] [2021-11-07 08:02:12,544 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-07 08:02:12,544 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:02:12,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:02:12,545 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:02:12,549 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-07 08:02:14,086 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-11-07 08:02:14,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:02:14,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 430 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-07 08:02:14,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:02:14,120 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:02:14,120 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 08:02:14,973 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 66 proven. 263 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:02:14,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [194883315] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:02:14,973 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:02:14,973 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 19] total 29 [2021-11-07 08:02:14,973 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083864845] [2021-11-07 08:02:14,974 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-07 08:02:14,974 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:02:14,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-07 08:02:14,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=774, Unknown=0, NotChecked=0, Total=870 [2021-11-07 08:02:14,974 INFO L87 Difference]: Start difference. First operand 715 states and 784 transitions. Second operand has 30 states, 29 states have (on average 6.758620689655173) internal successors, (196), 28 states have internal predecessors, (196), 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 08:02:15,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:02:15,978 INFO L93 Difference]: Finished difference Result 794 states and 886 transitions. [2021-11-07 08:02:15,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-07 08:02:15,978 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 6.758620689655173) internal successors, (196), 28 states have internal predecessors, (196), 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 122 [2021-11-07 08:02:15,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:02:15,982 INFO L225 Difference]: With dead ends: 794 [2021-11-07 08:02:15,982 INFO L226 Difference]: Without dead ends: 788 [2021-11-07 08:02:15,982 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 114 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 403 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=1393, Unknown=0, NotChecked=0, Total=1560 [2021-11-07 08:02:15,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 788 states. [2021-11-07 08:02:15,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 788 to 775. [2021-11-07 08:02:15,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 775 states, 763 states have (on average 1.1009174311926606) internal successors, (840), 765 states have internal predecessors, (840), 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 08:02:15,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 775 states to 775 states and 849 transitions. [2021-11-07 08:02:15,997 INFO L78 Accepts]: Start accepts. Automaton has 775 states and 849 transitions. Word has length 122 [2021-11-07 08:02:15,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:02:15,997 INFO L470 AbstractCegarLoop]: Abstraction has 775 states and 849 transitions. [2021-11-07 08:02:15,997 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 6.758620689655173) internal successors, (196), 28 states have internal predecessors, (196), 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 08:02:15,998 INFO L276 IsEmpty]: Start isEmpty. Operand 775 states and 849 transitions. [2021-11-07 08:02:16,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-07 08:02:16,001 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:02:16,001 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 9, 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, 1, 1] [2021-11-07 08:02:16,055 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-07 08:02:16,228 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-11-07 08:02:16,228 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting subseqErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-07 08:02:16,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:02:16,228 INFO L85 PathProgramCache]: Analyzing trace with hash -1364707073, now seen corresponding path program 12 times [2021-11-07 08:02:16,229 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:02:16,229 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582346390] [2021-11-07 08:02:16,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:02:16,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:02:16,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:02:16,713 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-07 08:02:16,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:02:16,717 INFO L134 CoverageAnalysis]: Checked inductivity of 404 backedges. 60 proven. 343 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 08:02:16,717 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:02:16,717 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582346390] [2021-11-07 08:02:16,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [582346390] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:02:16,718 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [297267722] [2021-11-07 08:02:16,718 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-07 08:02:16,718 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:02:16,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:02:16,720 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:02:16,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-07 08:02:18,570 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-11-07 08:02:18,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 08:02:18,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 463 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-07 08:02:18,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:02:18,628 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-07 08:02:18,629 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 08:02:18,876 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 08:02:19,201 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 08:02:19,201 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 08:02:19,539 INFO L134 CoverageAnalysis]: Checked inductivity of 404 backedges. 0 proven. 74 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-07 08:02:19,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [297267722] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:02:19,540 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:02:19,540 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 9] total 34 [2021-11-07 08:02:19,540 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206849481] [2021-11-07 08:02:19,541 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-07 08:02:19,541 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:02:19,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-07 08:02:19,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=1042, Unknown=0, NotChecked=0, Total=1122 [2021-11-07 08:02:19,542 INFO L87 Difference]: Start difference. First operand 775 states and 849 transitions. Second operand has 34 states, 32 states have (on average 5.15625) internal successors, (165), 31 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 08:02:23,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:02:23,429 INFO L93 Difference]: Finished difference Result 1294 states and 1393 transitions. [2021-11-07 08:02:23,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-07 08:02:23,429 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 32 states have (on average 5.15625) internal successors, (165), 31 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 132 [2021-11-07 08:02:23,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:02:23,430 INFO L225 Difference]: With dead ends: 1294 [2021-11-07 08:02:23,430 INFO L226 Difference]: Without dead ends: 0 [2021-11-07 08:02:23,431 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1983 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=801, Invalid=6855, Unknown=0, NotChecked=0, Total=7656 [2021-11-07 08:02:23,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-11-07 08:02:23,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-11-07 08:02:23,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:02:23,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-11-07 08:02:23,432 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 132 [2021-11-07 08:02:23,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:02:23,433 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-11-07 08:02:23,433 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 32 states have (on average 5.15625) internal successors, (165), 31 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 08:02:23,433 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-11-07 08:02:23,433 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-11-07 08:02:23,436 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr0REQUIRES_VIOLATION [2021-11-07 08:02:23,437 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr1REQUIRES_VIOLATION [2021-11-07 08:02:23,437 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr2REQUIRES_VIOLATION [2021-11-07 08:02:23,437 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr3REQUIRES_VIOLATION [2021-11-07 08:02:23,438 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr4REQUIRES_VIOLATION [2021-11-07 08:02:23,438 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr5REQUIRES_VIOLATION [2021-11-07 08:02:23,438 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr6REQUIRES_VIOLATION [2021-11-07 08:02:23,438 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr7REQUIRES_VIOLATION [2021-11-07 08:02:23,438 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr8ENSURES_VIOLATIONMEMORY_LEAK [2021-11-07 08:02:23,439 INFO L764 garLoopResultBuilder]: Registering result SAFE for location subseqErr0REQUIRES_VIOLATION [2021-11-07 08:02:23,439 INFO L764 garLoopResultBuilder]: Registering result SAFE for location subseqErr1REQUIRES_VIOLATION [2021-11-07 08:02:23,439 INFO L764 garLoopResultBuilder]: Registering result SAFE for location subseqErr2REQUIRES_VIOLATION [2021-11-07 08:02:23,439 INFO L764 garLoopResultBuilder]: Registering result SAFE for location subseqErr3REQUIRES_VIOLATION [2021-11-07 08:02:23,439 INFO L764 garLoopResultBuilder]: Registering result SAFE for location subseqErr4REQUIRES_VIOLATION [2021-11-07 08:02:23,439 INFO L764 garLoopResultBuilder]: Registering result SAFE for location subseqErr5REQUIRES_VIOLATION [2021-11-07 08:02:23,439 INFO L764 garLoopResultBuilder]: Registering result SAFE for location subseqErr6REQUIRES_VIOLATION [2021-11-07 08:02:23,439 INFO L764 garLoopResultBuilder]: Registering result SAFE for location subseqErr7REQUIRES_VIOLATION [2021-11-07 08:02:23,440 INFO L764 garLoopResultBuilder]: Registering result SAFE for location subseqErr8REQUIRES_VIOLATION [2021-11-07 08:02:23,440 INFO L764 garLoopResultBuilder]: Registering result SAFE for location subseqErr9REQUIRES_VIOLATION [2021-11-07 08:02:23,472 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-07 08:02:23,640 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:02:23,645 INFO L731 BasicCegarLoop]: Path program histogram: [12, 9, 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 08:02:23,647 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-07 08:02:23,650 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 08:02:23 BoogieIcfgContainer [2021-11-07 08:02:23,650 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-07 08:02:23,651 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-07 08:02:23,651 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-07 08:02:23,652 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-07 08:02:23,652 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 07:59:29" (3/4) ... [2021-11-07 08:02:23,655 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-11-07 08:02:23,662 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2021-11-07 08:02:23,662 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure subseq [2021-11-07 08:02:23,662 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_32 [2021-11-07 08:02:23,662 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_64 [2021-11-07 08:02:23,662 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint16_identity [2021-11-07 08:02:23,662 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint64_identity [2021-11-07 08:02:23,662 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2021-11-07 08:02:23,663 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint32_identity [2021-11-07 08:02:23,669 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 15 nodes and edges [2021-11-07 08:02:23,669 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 9 nodes and edges [2021-11-07 08:02:23,670 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-11-07 08:02:23,670 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-11-07 08:02:23,719 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/witness.graphml [2021-11-07 08:02:23,719 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-07 08:02:23,720 INFO L168 Benchmark]: Toolchain (without parser) took 175661.72 ms. Allocated memory was 86.0 MB in the beginning and 297.8 MB in the end (delta: 211.8 MB). Free memory was 48.9 MB in the beginning and 63.2 MB in the end (delta: -14.2 MB). Peak memory consumption was 196.8 MB. Max. memory is 16.1 GB. [2021-11-07 08:02:23,721 INFO L168 Benchmark]: CDTParser took 0.34 ms. Allocated memory is still 86.0 MB. Free memory is still 66.5 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 08:02:23,721 INFO L168 Benchmark]: CACSL2BoogieTranslator took 655.78 ms. Allocated memory was 86.0 MB in the beginning and 113.2 MB in the end (delta: 27.3 MB). Free memory was 48.7 MB in the beginning and 83.9 MB in the end (delta: -35.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-11-07 08:02:23,721 INFO L168 Benchmark]: Boogie Preprocessor took 81.20 ms. Allocated memory is still 113.2 MB. Free memory was 83.9 MB in the beginning and 81.5 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-07 08:02:23,722 INFO L168 Benchmark]: RCFGBuilder took 670.61 ms. Allocated memory is still 113.2 MB. Free memory was 81.5 MB in the beginning and 61.0 MB in the end (delta: 20.5 MB). Peak memory consumption was 21.0 MB. Max. memory is 16.1 GB. [2021-11-07 08:02:23,722 INFO L168 Benchmark]: TraceAbstraction took 174179.10 ms. Allocated memory was 113.2 MB in the beginning and 297.8 MB in the end (delta: 184.5 MB). Free memory was 60.6 MB in the beginning and 66.2 MB in the end (delta: -5.7 MB). Peak memory consumption was 180.3 MB. Max. memory is 16.1 GB. [2021-11-07 08:02:23,723 INFO L168 Benchmark]: Witness Printer took 68.08 ms. Allocated memory is still 297.8 MB. Free memory was 66.2 MB in the beginning and 63.2 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-11-07 08:02:23,725 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.34 ms. Allocated memory is still 86.0 MB. Free memory is still 66.5 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 655.78 ms. Allocated memory was 86.0 MB in the beginning and 113.2 MB in the end (delta: 27.3 MB). Free memory was 48.7 MB in the beginning and 83.9 MB in the end (delta: -35.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 81.20 ms. Allocated memory is still 113.2 MB. Free memory was 83.9 MB in the beginning and 81.5 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 670.61 ms. Allocated memory is still 113.2 MB. Free memory was 81.5 MB in the beginning and 61.0 MB in the end (delta: 20.5 MB). Peak memory consumption was 21.0 MB. Max. memory is 16.1 GB. * TraceAbstraction took 174179.10 ms. Allocated memory was 113.2 MB in the beginning and 297.8 MB in the end (delta: 184.5 MB). Free memory was 60.6 MB in the beginning and 66.2 MB in the end (delta: -5.7 MB). Peak memory consumption was 180.3 MB. Max. memory is 16.1 GB. * Witness Printer took 68.08 ms. Allocated memory is still 297.8 MB. Free memory was 66.2 MB in the beginning and 63.2 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 541]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 541]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 547]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 547]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 550]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 550]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 551]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 551]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 527]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 518]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 518]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 518]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 518]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 519]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 519]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 519]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 519]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 524]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 524]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 9 procedures, 75 locations, 19 error locations. Started 1 CEGAR loops. OverallTime: 174.0s, OverallIterations: 45, TraceHistogramMax: 9, PathProgramHistogramMax: 12, EmptinessCheckTime: 0.0s, AutomataDifference: 105.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 2141 SDtfs, 7076 SDslu, 7908 SDs, 0 SdLazy, 42363 SolverSat, 914 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 22.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 3067 GetRequests, 1778 SyntacticMatches, 24 SemanticMatches, 1265 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14755 ImplicationChecksByTransitivity, 92.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=930occurred in iteration=42, InterpolantAutomatonStates: 764, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.4s AutomataMinimizationTime, 45 MinimizatonAttempts, 1714 StatesRemovedByMinimization, 35 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.3s SsaConstructionTime, 2.1s SatisfiabilityAnalysisTime, 38.8s InterpolantComputationTime, 4247 NumberOfCodeBlocks, 4227 NumberOfCodeBlocksAsserted, 120 NumberOfCheckSat, 4177 ConstructedInterpolants, 241 QuantifiedInterpolants, 42138 SizeOfPredicates, 264 NumberOfNonLiveVariables, 7169 ConjunctsInSsa, 931 ConjunctsInUnsatCore, 70 InterpolantComputations, 20 PerfectInterpolantSequences, 2015/6267 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 19 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2021-11-07 08:02:23,799 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0500092-8f78-4509-9c9f-217c910567ae/bin/uautomizer-AkOaLMaTGY/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE