./Ultimate.py --spec ../sv-benchmarks/c/properties/valid-memsafety.prp --file ../sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 20ed64ec Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerMemDerefMemtrack.xml -i ../sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --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 0ce920e15f46d58ceba7fe374bfd0d01be2609b3 .............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-20ed64e [2021-08-27 07:16:42,613 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-27 07:16:42,616 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-27 07:16:42,658 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-27 07:16:42,659 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-27 07:16:42,662 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-27 07:16:42,664 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-27 07:16:42,669 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-27 07:16:42,671 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-27 07:16:42,676 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-27 07:16:42,677 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-27 07:16:42,681 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-27 07:16:42,681 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-27 07:16:42,685 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-27 07:16:42,687 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-27 07:16:42,691 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-27 07:16:42,692 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-27 07:16:42,694 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-27 07:16:42,696 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-27 07:16:42,704 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-27 07:16:42,706 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-27 07:16:42,707 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-27 07:16:42,709 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-27 07:16:42,710 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-27 07:16:42,716 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-08-27 07:16:42,717 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-08-27 07:16:42,717 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-08-27 07:16:42,719 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-08-27 07:16:42,720 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-08-27 07:16:42,720 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-08-27 07:16:42,721 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-27 07:16:42,721 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-27 07:16:42,723 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-27 07:16:42,723 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-27 07:16:42,725 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-27 07:16:42,725 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-27 07:16:42,726 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-27 07:16:42,726 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-27 07:16:42,726 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-27 07:16:42,728 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-27 07:16:42,729 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-27 07:16:42,730 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-08-27 07:16:42,771 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-27 07:16:42,771 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-27 07:16:42,772 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-08-27 07:16:42,772 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-08-27 07:16:42,774 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-27 07:16:42,775 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-27 07:16:42,775 INFO L138 SettingsManager]: * Use SBE=true [2021-08-27 07:16:42,775 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-27 07:16:42,775 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-27 07:16:42,776 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-08-27 07:16:42,776 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-27 07:16:42,776 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-27 07:16:42,777 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-27 07:16:42,777 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-08-27 07:16:42,777 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-08-27 07:16:42,777 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-08-27 07:16:42,777 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-27 07:16:42,777 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-08-27 07:16:42,778 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-27 07:16:42,778 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-27 07:16:42,778 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-27 07:16:42,787 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-27 07:16:42,787 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-27 07:16:42,788 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-27 07:16:42,788 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-27 07:16:42,788 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-27 07:16:42,788 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-27 07:16:42,788 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-27 07:16:42,789 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-08-27 07:16:42,789 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:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0ce920e15f46d58ceba7fe374bfd0d01be2609b3 [2021-08-27 07:16:43,104 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-27 07:16:43,124 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-27 07:16:43,126 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-27 07:16:43,128 INFO L271 PluginConnector]: Initializing CDTParser... [2021-08-27 07:16:43,129 INFO L275 PluginConnector]: CDTParser initialized [2021-08-27 07:16:43,130 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i [2021-08-27 07:16:43,203 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/09db9c7d1/004d0331819e4b5a8bc16270c22f783f/FLAG30c386d6f [2021-08-27 07:16:43,769 INFO L306 CDTParser]: Found 1 translation units. [2021-08-27 07:16:43,769 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i [2021-08-27 07:16:43,781 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/09db9c7d1/004d0331819e4b5a8bc16270c22f783f/FLAG30c386d6f [2021-08-27 07:16:44,175 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/09db9c7d1/004d0331819e4b5a8bc16270c22f783f [2021-08-27 07:16:44,177 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-27 07:16:44,178 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-08-27 07:16:44,179 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-08-27 07:16:44,179 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-08-27 07:16:44,190 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-08-27 07:16:44,191 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.08 07:16:44" (1/1) ... [2021-08-27 07:16:44,191 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@659ae6f0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:16:44, skipping insertion in model container [2021-08-27 07:16:44,192 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.08 07:16:44" (1/1) ... [2021-08-27 07:16:44,197 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-08-27 07:16:44,224 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-08-27 07:16:44,489 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i[24275,24288] [2021-08-27 07:16:44,494 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-27 07:16:44,506 INFO L203 MainTranslator]: Completed pre-run [2021-08-27 07:16:44,565 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i[24275,24288] [2021-08-27 07:16:44,566 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-08-27 07:16:44,589 INFO L208 MainTranslator]: Completed translation [2021-08-27 07:16:44,590 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:16:44 WrapperNode [2021-08-27 07:16:44,590 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-08-27 07:16:44,591 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-27 07:16:44,591 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-27 07:16:44,591 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-27 07:16:44,601 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:16:44" (1/1) ... [2021-08-27 07:16:44,602 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:16:44" (1/1) ... [2021-08-27 07:16:44,625 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:16:44" (1/1) ... [2021-08-27 07:16:44,625 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:16:44" (1/1) ... [2021-08-27 07:16:44,640 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:16:44" (1/1) ... [2021-08-27 07:16:44,644 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:16:44" (1/1) ... [2021-08-27 07:16:44,647 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:16:44" (1/1) ... [2021-08-27 07:16:44,653 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-27 07:16:44,654 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-27 07:16:44,654 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-27 07:16:44,654 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-27 07:16:44,655 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:16:44" (1/1) ... [2021-08-27 07:16:44,666 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-27 07:16:44,673 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:16:44,682 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-08-27 07:16:44,700 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-08-27 07:16:44,730 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-08-27 07:16:44,730 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-27 07:16:44,731 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-08-27 07:16:44,731 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-08-27 07:16:44,731 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-08-27 07:16:44,731 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2021-08-27 07:16:44,731 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-08-27 07:16:44,731 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_create [2021-08-27 07:16:44,732 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_remove_last [2021-08-27 07:16:44,732 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-08-27 07:16:44,732 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-08-27 07:16:44,732 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-08-27 07:16:44,732 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-08-27 07:16:44,732 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-08-27 07:16:44,733 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-08-27 07:16:44,733 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-08-27 07:16:44,733 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-08-27 07:16:44,733 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-08-27 07:16:44,733 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-08-27 07:16:44,733 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-08-27 07:16:44,734 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-08-27 07:16:44,734 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-08-27 07:16:44,734 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-08-27 07:16:44,734 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-08-27 07:16:44,734 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-08-27 07:16:44,734 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-08-27 07:16:44,734 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-08-27 07:16:44,735 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-08-27 07:16:44,735 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-08-27 07:16:44,735 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-08-27 07:16:44,735 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-08-27 07:16:44,735 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-08-27 07:16:44,735 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-08-27 07:16:44,736 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-08-27 07:16:44,736 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-08-27 07:16:44,736 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-08-27 07:16:44,736 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-08-27 07:16:44,736 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-08-27 07:16:44,741 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-08-27 07:16:44,741 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-08-27 07:16:44,741 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-08-27 07:16:44,741 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-08-27 07:16:44,741 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-08-27 07:16:44,742 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-08-27 07:16:44,742 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-08-27 07:16:44,742 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-08-27 07:16:44,742 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-08-27 07:16:44,742 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-08-27 07:16:44,742 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-08-27 07:16:44,743 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-08-27 07:16:44,743 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-08-27 07:16:44,743 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-08-27 07:16:44,743 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-08-27 07:16:44,743 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-08-27 07:16:44,743 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-08-27 07:16:44,743 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-08-27 07:16:44,744 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-08-27 07:16:44,744 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-08-27 07:16:44,744 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-08-27 07:16:44,744 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-08-27 07:16:44,744 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-08-27 07:16:44,744 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-08-27 07:16:44,745 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-08-27 07:16:44,745 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-08-27 07:16:44,745 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-08-27 07:16:44,745 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-08-27 07:16:44,745 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-08-27 07:16:44,745 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-08-27 07:16:44,745 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-08-27 07:16:44,746 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-08-27 07:16:44,746 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-08-27 07:16:44,746 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-08-27 07:16:44,746 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2021-08-27 07:16:44,746 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-08-27 07:16:44,746 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-08-27 07:16:44,747 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-08-27 07:16:44,747 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-08-27 07:16:44,747 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-08-27 07:16:44,747 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-08-27 07:16:44,747 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-08-27 07:16:44,747 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-08-27 07:16:44,747 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-08-27 07:16:44,748 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-08-27 07:16:44,748 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-08-27 07:16:44,748 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-08-27 07:16:44,748 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-08-27 07:16:44,748 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-08-27 07:16:44,748 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-08-27 07:16:44,749 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-08-27 07:16:44,749 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-08-27 07:16:44,749 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-08-27 07:16:44,749 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-08-27 07:16:44,749 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-08-27 07:16:44,749 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-08-27 07:16:44,750 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-08-27 07:16:44,750 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-08-27 07:16:44,750 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-08-27 07:16:44,750 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-08-27 07:16:44,750 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-08-27 07:16:44,750 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-08-27 07:16:44,751 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-08-27 07:16:44,751 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-08-27 07:16:44,751 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-08-27 07:16:44,751 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-08-27 07:16:44,751 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-08-27 07:16:44,751 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-08-27 07:16:44,751 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-08-27 07:16:44,752 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-08-27 07:16:44,752 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-08-27 07:16:44,752 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-08-27 07:16:44,752 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-08-27 07:16:44,754 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-08-27 07:16:44,754 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-08-27 07:16:44,754 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-08-27 07:16:44,754 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-08-27 07:16:44,754 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-08-27 07:16:44,755 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-08-27 07:16:44,755 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-08-27 07:16:44,755 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-08-27 07:16:44,755 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-08-27 07:16:44,755 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2021-08-27 07:16:44,755 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-08-27 07:16:44,756 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-08-27 07:16:44,756 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-08-27 07:16:44,756 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-08-27 07:16:44,756 INFO L130 BoogieDeclarations]: Found specification of procedure dll_create [2021-08-27 07:16:44,757 INFO L130 BoogieDeclarations]: Found specification of procedure dll_remove_last [2021-08-27 07:16:44,757 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-08-27 07:16:44,758 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-08-27 07:16:44,759 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-08-27 07:16:44,759 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-08-27 07:16:44,759 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-08-27 07:16:44,760 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-08-27 07:16:44,760 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-27 07:16:44,760 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-08-27 07:16:45,117 INFO L758 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2021-08-27 07:16:45,357 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-27 07:16:45,358 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-08-27 07:16:45,359 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.08 07:16:45 BoogieIcfgContainer [2021-08-27 07:16:45,360 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-27 07:16:45,361 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-27 07:16:45,361 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-27 07:16:45,364 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-27 07:16:45,364 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.08 07:16:44" (1/3) ... [2021-08-27 07:16:45,365 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60468d88 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.08 07:16:45, skipping insertion in model container [2021-08-27 07:16:45,365 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.08 07:16:44" (2/3) ... [2021-08-27 07:16:45,366 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60468d88 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.08 07:16:45, skipping insertion in model container [2021-08-27 07:16:45,366 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.08 07:16:45" (3/3) ... [2021-08-27 07:16:45,367 INFO L111 eAbstractionObserver]: Analyzing ICFG dll2n_remove_all_reverse.i [2021-08-27 07:16:45,371 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-27 07:16:45,372 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 40 error locations. [2021-08-27 07:16:45,408 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-08-27 07:16:45,414 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, mConcurrency=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 [2021-08-27 07:16:45,414 INFO L340 AbstractCegarLoop]: Starting to check reachability of 40 error locations. [2021-08-27 07:16:45,428 INFO L276 IsEmpty]: Start isEmpty. Operand has 88 states, 44 states have (on average 2.0) internal successors, (88), 78 states have internal predecessors, (88), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-08-27 07:16:45,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-08-27 07:16:45,439 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:16:45,440 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:16:45,441 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting dll_createErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:16:45,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:16:45,451 INFO L82 PathProgramCache]: Analyzing trace with hash -961704470, now seen corresponding path program 1 times [2021-08-27 07:16:45,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:16:45,469 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081586307] [2021-08-27 07:16:45,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:45,470 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:16:45,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:45,709 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:16:45,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:45,741 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:16:45,741 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:16:45,741 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1081586307] [2021-08-27 07:16:45,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1081586307] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:16:45,742 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:16:45,742 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-08-27 07:16:45,744 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287548758] [2021-08-27 07:16:45,751 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-08-27 07:16:45,751 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:16:45,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-08-27 07:16:45,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-08-27 07:16:45,768 INFO L87 Difference]: Start difference. First operand has 88 states, 44 states have (on average 2.0) internal successors, (88), 78 states have internal predecessors, (88), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-27 07:16:46,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:16:46,002 INFO L93 Difference]: Finished difference Result 89 states and 95 transitions. [2021-08-27 07:16:46,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-08-27 07:16:46,004 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-08-27 07:16:46,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:16:46,015 INFO L225 Difference]: With dead ends: 89 [2021-08-27 07:16:46,016 INFO L226 Difference]: Without dead ends: 83 [2021-08-27 07:16:46,017 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 34.3ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-08-27 07:16:46,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-08-27 07:16:46,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 79. [2021-08-27 07:16:46,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 41 states have (on average 1.853658536585366) internal successors, (76), 71 states have internal predecessors, (76), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-27 07:16:46,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 83 transitions. [2021-08-27 07:16:46,058 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 83 transitions. Word has length 11 [2021-08-27 07:16:46,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:16:46,059 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 83 transitions. [2021-08-27 07:16:46,059 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-27 07:16:46,059 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 83 transitions. [2021-08-27 07:16:46,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-08-27 07:16:46,060 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:16:46,060 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:16:46,060 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-27 07:16:46,061 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting dll_createErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:16:46,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:16:46,061 INFO L82 PathProgramCache]: Analyzing trace with hash -961704469, now seen corresponding path program 1 times [2021-08-27 07:16:46,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:16:46,062 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733462143] [2021-08-27 07:16:46,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:46,062 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:16:46,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:46,142 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:16:46,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:46,150 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:16:46,150 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:16:46,150 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733462143] [2021-08-27 07:16:46,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [733462143] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:16:46,151 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:16:46,151 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-08-27 07:16:46,151 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103554610] [2021-08-27 07:16:46,152 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-08-27 07:16:46,152 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:16:46,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-08-27 07:16:46,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-08-27 07:16:46,153 INFO L87 Difference]: Start difference. First operand 79 states and 83 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-27 07:16:46,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:16:46,320 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2021-08-27 07:16:46,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-08-27 07:16:46,321 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-08-27 07:16:46,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:16:46,324 INFO L225 Difference]: With dead ends: 80 [2021-08-27 07:16:46,324 INFO L226 Difference]: Without dead ends: 80 [2021-08-27 07:16:46,326 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.0ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-08-27 07:16:46,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-08-27 07:16:46,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 76. [2021-08-27 07:16:46,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 68 states have internal predecessors, (73), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-27 07:16:46,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2021-08-27 07:16:46,346 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 11 [2021-08-27 07:16:46,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:16:46,347 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2021-08-27 07:16:46,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-27 07:16:46,348 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2021-08-27 07:16:46,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-08-27 07:16:46,349 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:16:46,349 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:16:46,350 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-08-27 07:16:46,350 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:16:46,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:16:46,350 INFO L82 PathProgramCache]: Analyzing trace with hash 950899493, now seen corresponding path program 1 times [2021-08-27 07:16:46,351 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:16:46,351 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037092966] [2021-08-27 07:16:46,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:46,352 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:16:46,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:46,409 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:16:46,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:46,428 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:16:46,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:46,477 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:16:46,478 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:16:46,478 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037092966] [2021-08-27 07:16:46,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1037092966] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:16:46,479 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:16:46,479 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-08-27 07:16:46,479 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894233072] [2021-08-27 07:16:46,480 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-08-27 07:16:46,480 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:16:46,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-08-27 07:16:46,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-08-27 07:16:46,494 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 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) [2021-08-27 07:16:46,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:16:46,794 INFO L93 Difference]: Finished difference Result 89 states and 94 transitions. [2021-08-27 07:16:46,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-08-27 07:16:46,794 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 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) Word has length 15 [2021-08-27 07:16:46,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:16:46,795 INFO L225 Difference]: With dead ends: 89 [2021-08-27 07:16:46,795 INFO L226 Difference]: Without dead ends: 86 [2021-08-27 07:16:46,796 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 123.4ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-08-27 07:16:46,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-08-27 07:16:46,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 77. [2021-08-27 07:16:46,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 42 states have (on average 1.7619047619047619) internal successors, (74), 69 states have internal predecessors, (74), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-27 07:16:46,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 81 transitions. [2021-08-27 07:16:46,800 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 81 transitions. Word has length 15 [2021-08-27 07:16:46,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:16:46,801 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 81 transitions. [2021-08-27 07:16:46,801 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 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) [2021-08-27 07:16:46,801 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 81 transitions. [2021-08-27 07:16:46,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-08-27 07:16:46,801 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:16:46,802 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:16:46,802 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-08-27 07:16:46,802 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting dll_createErr6REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:16:46,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:16:46,802 INFO L82 PathProgramCache]: Analyzing trace with hash 2016813486, now seen corresponding path program 1 times [2021-08-27 07:16:46,802 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:16:46,803 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2034770225] [2021-08-27 07:16:46,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:46,803 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:16:46,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:46,852 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:16:46,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:46,865 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:16:46,865 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:16:46,865 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2034770225] [2021-08-27 07:16:46,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2034770225] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:16:46,866 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:16:46,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-08-27 07:16:46,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147146994] [2021-08-27 07:16:46,866 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-08-27 07:16:46,866 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:16:46,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-08-27 07:16:46,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-08-27 07:16:46,867 INFO L87 Difference]: Start difference. First operand 77 states and 81 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 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) [2021-08-27 07:16:47,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:16:47,017 INFO L93 Difference]: Finished difference Result 83 states and 87 transitions. [2021-08-27 07:16:47,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-27 07:16:47,019 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 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 [2021-08-27 07:16:47,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:16:47,021 INFO L225 Difference]: With dead ends: 83 [2021-08-27 07:16:47,022 INFO L226 Difference]: Without dead ends: 83 [2021-08-27 07:16:47,022 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 43.9ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-08-27 07:16:47,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-08-27 07:16:47,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2021-08-27 07:16:47,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 47 states have (on average 1.6808510638297873) internal successors, (79), 74 states have internal predecessors, (79), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-27 07:16:47,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 86 transitions. [2021-08-27 07:16:47,036 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 86 transitions. Word has length 15 [2021-08-27 07:16:47,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:16:47,036 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 86 transitions. [2021-08-27 07:16:47,036 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 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) [2021-08-27 07:16:47,037 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 86 transitions. [2021-08-27 07:16:47,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-08-27 07:16:47,037 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:16:47,037 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:16:47,037 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-08-27 07:16:47,037 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:16:47,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:16:47,038 INFO L82 PathProgramCache]: Analyzing trace with hash -1092107051, now seen corresponding path program 1 times [2021-08-27 07:16:47,038 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:16:47,038 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [991317163] [2021-08-27 07:16:47,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:47,038 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:16:47,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:47,114 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:16:47,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:47,142 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:16:47,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:47,192 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:16:47,192 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:16:47,192 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [991317163] [2021-08-27 07:16:47,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [991317163] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:16:47,193 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2063640498] [2021-08-27 07:16:47,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:47,193 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:16:47,194 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:16:47,195 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:16:47,206 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-08-27 07:16:47,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:47,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 5 conjunts are in the unsatisfiable core [2021-08-27 07:16:47,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:16:47,497 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:16:47,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2063640498] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:16:47,498 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:16:47,498 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 10 [2021-08-27 07:16:47,498 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269639271] [2021-08-27 07:16:47,498 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-08-27 07:16:47,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:16:47,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-08-27 07:16:47,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-08-27 07:16:47,499 INFO L87 Difference]: Start difference. First operand 82 states and 86 transitions. Second operand has 10 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-27 07:16:47,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:16:47,845 INFO L93 Difference]: Finished difference Result 96 states and 101 transitions. [2021-08-27 07:16:47,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-08-27 07:16:47,846 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2021-08-27 07:16:47,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:16:47,846 INFO L225 Difference]: With dead ends: 96 [2021-08-27 07:16:47,846 INFO L226 Difference]: Without dead ends: 93 [2021-08-27 07:16:47,847 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 125.6ms TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-08-27 07:16:47,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-08-27 07:16:47,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 84. [2021-08-27 07:16:47,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 49 states have (on average 1.653061224489796) internal successors, (81), 76 states have internal predecessors, (81), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-27 07:16:47,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 88 transitions. [2021-08-27 07:16:47,850 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 88 transitions. Word has length 22 [2021-08-27 07:16:47,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:16:47,850 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 88 transitions. [2021-08-27 07:16:47,850 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-27 07:16:47,850 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 88 transitions. [2021-08-27 07:16:47,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-08-27 07:16:47,851 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:16:47,851 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:16:47,896 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-08-27 07:16:48,051 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:16:48,052 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting dll_createErr6REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:16:48,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:16:48,052 INFO L82 PathProgramCache]: Analyzing trace with hash -26193058, now seen corresponding path program 1 times [2021-08-27 07:16:48,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:16:48,053 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [892852032] [2021-08-27 07:16:48,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:48,053 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:16:48,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:48,151 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:16:48,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:48,162 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:16:48,163 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:16:48,163 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [892852032] [2021-08-27 07:16:48,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [892852032] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:16:48,164 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1049132206] [2021-08-27 07:16:48,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:48,164 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:16:48,164 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:16:48,169 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:16:48,172 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-08-27 07:16:48,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:48,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 7 conjunts are in the unsatisfiable core [2021-08-27 07:16:48,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:16:48,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-27 07:16:48,489 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-08-27 07:16:48,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-08-27 07:16:48,622 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:16:48,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1049132206] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:16:48,623 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:16:48,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-08-27 07:16:48,623 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786388276] [2021-08-27 07:16:48,624 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-08-27 07:16:48,624 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:16:48,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-08-27 07:16:48,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-08-27 07:16:48,625 INFO L87 Difference]: Start difference. First operand 84 states and 88 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-27 07:16:48,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:16:48,806 INFO L93 Difference]: Finished difference Result 83 states and 87 transitions. [2021-08-27 07:16:48,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-27 07:16:48,807 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-08-27 07:16:48,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:16:48,808 INFO L225 Difference]: With dead ends: 83 [2021-08-27 07:16:48,808 INFO L226 Difference]: Without dead ends: 83 [2021-08-27 07:16:48,808 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 65.6ms TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-08-27 07:16:48,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-08-27 07:16:48,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-08-27 07:16:48,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 49 states have (on average 1.6326530612244898) internal successors, (80), 75 states have internal predecessors, (80), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-27 07:16:48,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 87 transitions. [2021-08-27 07:16:48,816 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 87 transitions. Word has length 22 [2021-08-27 07:16:48,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:16:48,816 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 87 transitions. [2021-08-27 07:16:48,817 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-27 07:16:48,817 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 87 transitions. [2021-08-27 07:16:48,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-08-27 07:16:48,817 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:16:48,817 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:16:48,847 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-08-27 07:16:49,037 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-08-27 07:16:49,037 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting dll_createErr7REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:16:49,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:16:49,037 INFO L82 PathProgramCache]: Analyzing trace with hash -26193057, now seen corresponding path program 1 times [2021-08-27 07:16:49,037 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:16:49,038 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [533849490] [2021-08-27 07:16:49,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:49,038 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:16:49,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:49,146 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:16:49,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:49,156 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:16:49,156 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:16:49,156 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [533849490] [2021-08-27 07:16:49,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [533849490] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:16:49,157 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [797692642] [2021-08-27 07:16:49,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:49,157 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:16:49,157 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:16:49,161 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:16:49,194 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-08-27 07:16:49,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:49,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 12 conjunts are in the unsatisfiable core [2021-08-27 07:16:49,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:16:49,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-27 07:16:49,530 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-08-27 07:16:49,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 22 treesize of output 24 [2021-08-27 07:16:49,544 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-08-27 07:16:49,544 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2021-08-27 07:16:49,698 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:16:49,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [797692642] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:16:49,698 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:16:49,699 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2021-08-27 07:16:49,699 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099504943] [2021-08-27 07:16:49,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-08-27 07:16:49,699 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:16:49,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-08-27 07:16:49,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-08-27 07:16:49,700 INFO L87 Difference]: Start difference. First operand 83 states and 87 transitions. Second operand has 9 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-27 07:16:50,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:16:50,041 INFO L93 Difference]: Finished difference Result 82 states and 86 transitions. [2021-08-27 07:16:50,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-27 07:16:50,042 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-08-27 07:16:50,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:16:50,043 INFO L225 Difference]: With dead ends: 82 [2021-08-27 07:16:50,043 INFO L226 Difference]: Without dead ends: 82 [2021-08-27 07:16:50,043 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 141.8ms TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-08-27 07:16:50,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-08-27 07:16:50,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-08-27 07:16:50,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 49 states have (on average 1.6122448979591837) internal successors, (79), 74 states have internal predecessors, (79), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-27 07:16:50,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 86 transitions. [2021-08-27 07:16:50,050 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 86 transitions. Word has length 22 [2021-08-27 07:16:50,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:16:50,050 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 86 transitions. [2021-08-27 07:16:50,050 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-08-27 07:16:50,051 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 86 transitions. [2021-08-27 07:16:50,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-08-27 07:16:50,051 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:16:50,051 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:16:50,069 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-08-27 07:16:50,264 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:16:50,267 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:16:50,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:16:50,268 INFO L82 PathProgramCache]: Analyzing trace with hash 668159269, now seen corresponding path program 2 times [2021-08-27 07:16:50,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:16:50,268 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [10283834] [2021-08-27 07:16:50,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:50,269 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:16:50,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:50,324 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:16:50,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:50,339 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:16:50,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:50,368 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:16:50,368 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:16:50,368 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [10283834] [2021-08-27 07:16:50,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [10283834] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:16:50,369 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2076652608] [2021-08-27 07:16:50,369 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-27 07:16:50,369 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:16:50,369 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:16:50,370 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:16:50,396 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-08-27 07:16:50,563 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-08-27 07:16:50,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-27 07:16:50,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2021-08-27 07:16:50,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:16:50,665 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-08-27 07:16:50,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2076652608] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:16:50,665 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-08-27 07:16:50,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-08-27 07:16:50,665 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468584060] [2021-08-27 07:16:50,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-08-27 07:16:50,666 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:16:50,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-08-27 07:16:50,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-08-27 07:16:50,666 INFO L87 Difference]: Start difference. First operand 82 states and 86 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-27 07:16:50,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:16:50,682 INFO L93 Difference]: Finished difference Result 85 states and 90 transitions. [2021-08-27 07:16:50,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-08-27 07:16:50,682 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 1 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 29 [2021-08-27 07:16:50,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:16:50,684 INFO L225 Difference]: With dead ends: 85 [2021-08-27 07:16:50,684 INFO L226 Difference]: Without dead ends: 85 [2021-08-27 07:16:50,684 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 61.6ms TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-08-27 07:16:50,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-08-27 07:16:50,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2021-08-27 07:16:50,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 50 states have (on average 1.6) internal successors, (80), 75 states have internal predecessors, (80), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-27 07:16:50,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 87 transitions. [2021-08-27 07:16:50,689 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 87 transitions. Word has length 29 [2021-08-27 07:16:50,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:16:50,689 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 87 transitions. [2021-08-27 07:16:50,690 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-27 07:16:50,690 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 87 transitions. [2021-08-27 07:16:50,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-08-27 07:16:50,690 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:16:50,690 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:16:50,719 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-08-27 07:16:50,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:16:50,913 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting dll_remove_lastErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:16:50,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:16:50,913 INFO L82 PathProgramCache]: Analyzing trace with hash -2143918591, now seen corresponding path program 1 times [2021-08-27 07:16:50,913 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:16:50,913 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1379875187] [2021-08-27 07:16:50,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:50,914 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:16:50,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:50,955 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:16:50,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:50,969 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:16:50,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:51,026 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:16:51,027 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:16:51,027 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1379875187] [2021-08-27 07:16:51,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1379875187] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:16:51,028 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886762696] [2021-08-27 07:16:51,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:51,028 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:16:51,028 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:16:51,033 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:16:51,035 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-08-27 07:16:51,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:51,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 5 conjunts are in the unsatisfiable core [2021-08-27 07:16:51,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:16:51,315 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:16:51,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1886762696] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:16:51,316 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:16:51,316 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4] total 6 [2021-08-27 07:16:51,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905155961] [2021-08-27 07:16:51,322 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-08-27 07:16:51,323 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:16:51,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-08-27 07:16:51,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-08-27 07:16:51,323 INFO L87 Difference]: Start difference. First operand 83 states and 87 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:16:51,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:16:51,508 INFO L93 Difference]: Finished difference Result 83 states and 86 transitions. [2021-08-27 07:16:51,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-08-27 07:16:51,508 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 31 [2021-08-27 07:16:51,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:16:51,509 INFO L225 Difference]: With dead ends: 83 [2021-08-27 07:16:51,509 INFO L226 Difference]: Without dead ends: 83 [2021-08-27 07:16:51,509 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 57.1ms TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-08-27 07:16:51,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-08-27 07:16:51,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-08-27 07:16:51,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 50 states have (on average 1.58) internal successors, (79), 75 states have internal predecessors, (79), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-27 07:16:51,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2021-08-27 07:16:51,512 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 31 [2021-08-27 07:16:51,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:16:51,512 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2021-08-27 07:16:51,513 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:16:51,513 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2021-08-27 07:16:51,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-08-27 07:16:51,513 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:16:51,514 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:16:51,533 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-08-27 07:16:51,720 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:16:51,721 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting dll_remove_lastErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:16:51,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:16:51,721 INFO L82 PathProgramCache]: Analyzing trace with hash -1187913315, now seen corresponding path program 1 times [2021-08-27 07:16:51,721 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:16:51,721 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576707969] [2021-08-27 07:16:51,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:51,722 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:16:51,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:51,787 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:16:51,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:51,805 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:16:51,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:52,101 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:16:52,101 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:16:52,101 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576707969] [2021-08-27 07:16:52,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1576707969] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:16:52,101 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [746836738] [2021-08-27 07:16:52,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:52,101 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:16:52,102 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:16:52,102 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:16:52,113 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-08-27 07:16:52,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:52,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 14 conjunts are in the unsatisfiable core [2021-08-27 07:16:52,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:16:52,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-27 07:16:52,388 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 9 treesize of output 7 [2021-08-27 07:16:52,772 INFO L354 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2021-08-27 07:16:52,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 20 treesize of output 24 [2021-08-27 07:16:52,956 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:16:52,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [746836738] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:16:52,956 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:16:52,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 18 [2021-08-27 07:16:52,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569421769] [2021-08-27 07:16:52,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-08-27 07:16:52,957 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:16:52,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-08-27 07:16:52,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-08-27 07:16:52,958 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand has 19 states, 17 states have (on average 3.0) internal successors, (51), 15 states have internal predecessors, (51), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-27 07:16:54,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:16:54,135 INFO L93 Difference]: Finished difference Result 132 states and 140 transitions. [2021-08-27 07:16:54,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-08-27 07:16:54,135 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 3.0) internal successors, (51), 15 states have internal predecessors, (51), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 32 [2021-08-27 07:16:54,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:16:54,136 INFO L225 Difference]: With dead ends: 132 [2021-08-27 07:16:54,137 INFO L226 Difference]: Without dead ends: 132 [2021-08-27 07:16:54,137 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 600.2ms TimeCoverageRelationStatistics Valid=155, Invalid=657, Unknown=0, NotChecked=0, Total=812 [2021-08-27 07:16:54,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-08-27 07:16:54,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 97. [2021-08-27 07:16:54,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 64 states have (on average 1.453125) internal successors, (93), 87 states have internal predecessors, (93), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-08-27 07:16:54,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 103 transitions. [2021-08-27 07:16:54,140 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 103 transitions. Word has length 32 [2021-08-27 07:16:54,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:16:54,141 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 103 transitions. [2021-08-27 07:16:54,141 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 3.0) internal successors, (51), 15 states have internal predecessors, (51), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-27 07:16:54,141 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 103 transitions. [2021-08-27 07:16:54,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-08-27 07:16:54,141 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:16:54,142 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:16:54,160 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-08-27 07:16:54,347 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:16:54,348 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting dll_remove_lastErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:16:54,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:16:54,348 INFO L82 PathProgramCache]: Analyzing trace with hash -1187913314, now seen corresponding path program 1 times [2021-08-27 07:16:54,348 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:16:54,348 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1353298168] [2021-08-27 07:16:54,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:54,348 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:16:54,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:54,455 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:16:54,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:54,473 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:16:54,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:54,671 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:16:54,672 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:16:54,672 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1353298168] [2021-08-27 07:16:54,672 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1353298168] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:16:54,672 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1652432510] [2021-08-27 07:16:54,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:54,673 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:16:54,673 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:16:54,677 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:16:54,706 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-08-27 07:16:54,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:54,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 19 conjunts are in the unsatisfiable core [2021-08-27 07:16:54,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:16:54,943 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-27 07:16:54,960 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 11 treesize of output 9 [2021-08-27 07:16:55,435 INFO L354 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2021-08-27 07:16:55,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 25 treesize of output 29 [2021-08-27 07:16:55,603 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:16:55,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1652432510] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:16:55,604 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:16:55,604 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 17 [2021-08-27 07:16:55,604 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12900785] [2021-08-27 07:16:55,606 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-08-27 07:16:55,606 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:16:55,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-08-27 07:16:55,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-08-27 07:16:55,609 INFO L87 Difference]: Start difference. First operand 97 states and 103 transitions. Second operand has 18 states, 16 states have (on average 3.125) internal successors, (50), 14 states have internal predecessors, (50), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-08-27 07:16:56,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:16:56,522 INFO L93 Difference]: Finished difference Result 142 states and 150 transitions. [2021-08-27 07:16:56,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-08-27 07:16:56,522 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.125) internal successors, (50), 14 states have internal predecessors, (50), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 32 [2021-08-27 07:16:56,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:16:56,526 INFO L225 Difference]: With dead ends: 142 [2021-08-27 07:16:56,526 INFO L226 Difference]: Without dead ends: 142 [2021-08-27 07:16:56,527 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 535.5ms TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2021-08-27 07:16:56,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-08-27 07:16:56,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 122. [2021-08-27 07:16:56,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 87 states have (on average 1.5517241379310345) internal successors, (135), 110 states have internal predecessors, (135), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-08-27 07:16:56,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 147 transitions. [2021-08-27 07:16:56,538 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 147 transitions. Word has length 32 [2021-08-27 07:16:56,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:16:56,538 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 147 transitions. [2021-08-27 07:16:56,538 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.125) internal successors, (50), 14 states have internal predecessors, (50), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-08-27 07:16:56,539 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 147 transitions. [2021-08-27 07:16:56,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-08-27 07:16:56,541 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:16:56,542 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:16:56,570 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-08-27 07:16:56,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:16:56,760 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting dll_remove_lastErr2REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:16:56,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:16:56,760 INFO L82 PathProgramCache]: Analyzing trace with hash 1829392906, now seen corresponding path program 1 times [2021-08-27 07:16:56,760 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:16:56,761 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1296736631] [2021-08-27 07:16:56,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:56,761 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:16:56,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:56,846 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:16:56,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:56,866 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:16:56,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:56,919 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-08-27 07:16:56,919 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:16:56,919 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1296736631] [2021-08-27 07:16:56,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1296736631] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:16:56,920 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:16:56,920 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-08-27 07:16:56,920 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045748778] [2021-08-27 07:16:56,920 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-08-27 07:16:56,920 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:16:56,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-08-27 07:16:56,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-08-27 07:16:56,921 INFO L87 Difference]: Start difference. First operand 122 states and 147 transitions. Second operand has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:16:57,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:16:57,473 INFO L93 Difference]: Finished difference Result 165 states and 205 transitions. [2021-08-27 07:16:57,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-08-27 07:16:57,474 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 33 [2021-08-27 07:16:57,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:16:57,478 INFO L225 Difference]: With dead ends: 165 [2021-08-27 07:16:57,478 INFO L226 Difference]: Without dead ends: 165 [2021-08-27 07:16:57,478 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 217.8ms TimeCoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2021-08-27 07:16:57,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-08-27 07:16:57,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 127. [2021-08-27 07:16:57,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 91 states have (on average 1.5714285714285714) internal successors, (143), 114 states have internal predecessors, (143), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-08-27 07:16:57,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 157 transitions. [2021-08-27 07:16:57,486 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 157 transitions. Word has length 33 [2021-08-27 07:16:57,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:16:57,486 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 157 transitions. [2021-08-27 07:16:57,486 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:16:57,486 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 157 transitions. [2021-08-27 07:16:57,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-08-27 07:16:57,489 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:16:57,489 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:16:57,489 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-08-27 07:16:57,490 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting dll_remove_lastErr3REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:16:57,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:16:57,490 INFO L82 PathProgramCache]: Analyzing trace with hash 1829392907, now seen corresponding path program 1 times [2021-08-27 07:16:57,490 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:16:57,490 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630502120] [2021-08-27 07:16:57,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:57,491 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:16:57,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:57,595 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:16:57,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:57,615 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:16:57,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:57,681 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-27 07:16:57,681 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:16:57,681 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630502120] [2021-08-27 07:16:57,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [630502120] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:16:57,682 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:16:57,682 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-08-27 07:16:57,682 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564896271] [2021-08-27 07:16:57,682 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-08-27 07:16:57,682 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:16:57,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-08-27 07:16:57,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-08-27 07:16:57,683 INFO L87 Difference]: Start difference. First operand 127 states and 157 transitions. Second operand has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:16:58,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:16:58,241 INFO L93 Difference]: Finished difference Result 168 states and 208 transitions. [2021-08-27 07:16:58,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-08-27 07:16:58,242 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 33 [2021-08-27 07:16:58,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:16:58,246 INFO L225 Difference]: With dead ends: 168 [2021-08-27 07:16:58,246 INFO L226 Difference]: Without dead ends: 168 [2021-08-27 07:16:58,246 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 253.2ms TimeCoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-08-27 07:16:58,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-08-27 07:16:58,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 127. [2021-08-27 07:16:58,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 91 states have (on average 1.5494505494505495) internal successors, (141), 114 states have internal predecessors, (141), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-08-27 07:16:58,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 155 transitions. [2021-08-27 07:16:58,254 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 155 transitions. Word has length 33 [2021-08-27 07:16:58,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:16:58,255 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 155 transitions. [2021-08-27 07:16:58,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:16:58,255 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 155 transitions. [2021-08-27 07:16:58,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-08-27 07:16:58,259 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:16:58,259 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:16:58,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-08-27 07:16:58,259 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting dll_remove_lastErr6ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:16:58,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:16:58,260 INFO L82 PathProgramCache]: Analyzing trace with hash 604055652, now seen corresponding path program 1 times [2021-08-27 07:16:58,260 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:16:58,260 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893475331] [2021-08-27 07:16:58,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:58,261 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:16:58,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:58,352 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:16:58,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:58,371 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:16:58,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:58,422 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-27 07:16:58,422 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:16:58,422 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893475331] [2021-08-27 07:16:58,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1893475331] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:16:58,422 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:16:58,423 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-08-27 07:16:58,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020535219] [2021-08-27 07:16:58,423 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-08-27 07:16:58,423 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:16:58,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-08-27 07:16:58,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-08-27 07:16:58,424 INFO L87 Difference]: Start difference. First operand 127 states and 155 transitions. Second operand has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 8 states have internal predecessors, (30), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:16:58,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:16:58,947 INFO L93 Difference]: Finished difference Result 126 states and 153 transitions. [2021-08-27 07:16:58,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-08-27 07:16:58,948 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 8 states have internal predecessors, (30), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 36 [2021-08-27 07:16:58,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:16:58,950 INFO L225 Difference]: With dead ends: 126 [2021-08-27 07:16:58,950 INFO L226 Difference]: Without dead ends: 126 [2021-08-27 07:16:58,950 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 291.1ms TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-08-27 07:16:58,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-08-27 07:16:58,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2021-08-27 07:16:58,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 91 states have (on average 1.5274725274725274) internal successors, (139), 113 states have internal predecessors, (139), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-08-27 07:16:58,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 153 transitions. [2021-08-27 07:16:58,957 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 153 transitions. Word has length 36 [2021-08-27 07:16:58,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:16:58,957 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 153 transitions. [2021-08-27 07:16:58,957 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 8 states have internal predecessors, (30), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:16:58,957 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 153 transitions. [2021-08-27 07:16:58,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-08-27 07:16:58,958 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:16:58,959 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:16:58,959 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-08-27 07:16:58,959 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting dll_remove_lastErr13REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:16:58,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:16:58,960 INFO L82 PathProgramCache]: Analyzing trace with hash 1546287056, now seen corresponding path program 1 times [2021-08-27 07:16:58,960 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:16:58,960 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1777990982] [2021-08-27 07:16:58,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:58,960 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:16:58,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:59,036 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:16:59,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:59,054 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:16:59,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:59,068 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-08-27 07:16:59,068 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:16:59,068 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1777990982] [2021-08-27 07:16:59,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1777990982] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:16:59,069 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:16:59,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-08-27 07:16:59,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488293793] [2021-08-27 07:16:59,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-08-27 07:16:59,070 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:16:59,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-08-27 07:16:59,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-08-27 07:16:59,071 INFO L87 Difference]: Start difference. First operand 126 states and 153 transitions. Second operand has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:16:59,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:16:59,412 INFO L93 Difference]: Finished difference Result 127 states and 153 transitions. [2021-08-27 07:16:59,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-08-27 07:16:59,413 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 37 [2021-08-27 07:16:59,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:16:59,413 INFO L225 Difference]: With dead ends: 127 [2021-08-27 07:16:59,414 INFO L226 Difference]: Without dead ends: 127 [2021-08-27 07:16:59,414 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 214.1ms TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2021-08-27 07:16:59,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-08-27 07:16:59,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2021-08-27 07:16:59,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 93 states have (on average 1.4946236559139785) internal successors, (139), 113 states have internal predecessors, (139), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-08-27 07:16:59,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 153 transitions. [2021-08-27 07:16:59,418 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 153 transitions. Word has length 37 [2021-08-27 07:16:59,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:16:59,418 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 153 transitions. [2021-08-27 07:16:59,419 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:16:59,419 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 153 transitions. [2021-08-27 07:16:59,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-08-27 07:16:59,419 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:16:59,419 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:16:59,419 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-08-27 07:16:59,420 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting dll_remove_lastErr14REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:16:59,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:16:59,420 INFO L82 PathProgramCache]: Analyzing trace with hash 1546287057, now seen corresponding path program 1 times [2021-08-27 07:16:59,420 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:16:59,420 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636207859] [2021-08-27 07:16:59,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:16:59,421 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:16:59,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:59,573 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:16:59,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:59,595 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:16:59,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:16:59,676 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-27 07:16:59,676 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:16:59,676 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636207859] [2021-08-27 07:16:59,676 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [636207859] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:16:59,676 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:16:59,676 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-08-27 07:16:59,676 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997060581] [2021-08-27 07:16:59,677 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-08-27 07:16:59,677 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:16:59,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-08-27 07:16:59,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2021-08-27 07:16:59,678 INFO L87 Difference]: Start difference. First operand 126 states and 153 transitions. Second operand has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:17:00,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:17:00,427 INFO L93 Difference]: Finished difference Result 188 states and 230 transitions. [2021-08-27 07:17:00,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-08-27 07:17:00,428 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 37 [2021-08-27 07:17:00,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:17:00,429 INFO L225 Difference]: With dead ends: 188 [2021-08-27 07:17:00,430 INFO L226 Difference]: Without dead ends: 188 [2021-08-27 07:17:00,430 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 408.0ms TimeCoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2021-08-27 07:17:00,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-08-27 07:17:00,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 150. [2021-08-27 07:17:00,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 115 states have (on average 1.4956521739130435) internal successors, (172), 137 states have internal predecessors, (172), 7 states have call successors, (7), 7 states have call predecessors, (7), 7 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-08-27 07:17:00,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 188 transitions. [2021-08-27 07:17:00,436 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 188 transitions. Word has length 37 [2021-08-27 07:17:00,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:17:00,436 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 188 transitions. [2021-08-27 07:17:00,436 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:17:00,436 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 188 transitions. [2021-08-27 07:17:00,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-08-27 07:17:00,437 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:17:00,437 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:17:00,437 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-08-27 07:17:00,437 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting dll_remove_lastErr7ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:17:00,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:17:00,438 INFO L82 PathProgramCache]: Analyzing trace with hash 1545856107, now seen corresponding path program 1 times [2021-08-27 07:17:00,438 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:17:00,438 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1176695287] [2021-08-27 07:17:00,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:00,438 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:17:00,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:00,510 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:17:00,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:00,529 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:17:00,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:00,578 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-27 07:17:00,578 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:17:00,578 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1176695287] [2021-08-27 07:17:00,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1176695287] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:17:00,579 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:17:00,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-08-27 07:17:00,579 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311540424] [2021-08-27 07:17:00,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-08-27 07:17:00,579 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:17:00,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-08-27 07:17:00,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-08-27 07:17:00,580 INFO L87 Difference]: Start difference. First operand 150 states and 188 transitions. Second operand has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 8 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:17:01,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:17:01,085 INFO L93 Difference]: Finished difference Result 182 states and 226 transitions. [2021-08-27 07:17:01,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-08-27 07:17:01,086 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 8 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 37 [2021-08-27 07:17:01,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:17:01,087 INFO L225 Difference]: With dead ends: 182 [2021-08-27 07:17:01,087 INFO L226 Difference]: Without dead ends: 182 [2021-08-27 07:17:01,087 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 229.9ms TimeCoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2021-08-27 07:17:01,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-08-27 07:17:01,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 156. [2021-08-27 07:17:01,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 121 states have (on average 1.4793388429752066) internal successors, (179), 143 states have internal predecessors, (179), 7 states have call successors, (7), 7 states have call predecessors, (7), 7 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-08-27 07:17:01,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 195 transitions. [2021-08-27 07:17:01,093 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 195 transitions. Word has length 37 [2021-08-27 07:17:01,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:17:01,093 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 195 transitions. [2021-08-27 07:17:01,093 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 8 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:17:01,093 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 195 transitions. [2021-08-27 07:17:01,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-08-27 07:17:01,094 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:17:01,094 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:17:01,094 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-08-27 07:17:01,094 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting dll_remove_lastErr8ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:17:01,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:17:01,095 INFO L82 PathProgramCache]: Analyzing trace with hash 676899142, now seen corresponding path program 1 times [2021-08-27 07:17:01,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:17:01,095 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1841433721] [2021-08-27 07:17:01,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:01,096 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:17:01,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:01,147 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:17:01,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:01,163 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:17:01,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:01,172 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-08-27 07:17:01,173 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:17:01,173 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1841433721] [2021-08-27 07:17:01,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1841433721] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:17:01,173 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:17:01,173 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-08-27 07:17:01,173 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657058235] [2021-08-27 07:17:01,173 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-08-27 07:17:01,174 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:17:01,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-08-27 07:17:01,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-08-27 07:17:01,174 INFO L87 Difference]: Start difference. First operand 156 states and 195 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:17:01,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:17:01,428 INFO L93 Difference]: Finished difference Result 155 states and 193 transitions. [2021-08-27 07:17:01,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-08-27 07:17:01,429 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 38 [2021-08-27 07:17:01,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:17:01,430 INFO L225 Difference]: With dead ends: 155 [2021-08-27 07:17:01,430 INFO L226 Difference]: Without dead ends: 155 [2021-08-27 07:17:01,430 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 149.8ms TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2021-08-27 07:17:01,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-08-27 07:17:01,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 155. [2021-08-27 07:17:01,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 121 states have (on average 1.462809917355372) internal successors, (177), 142 states have internal predecessors, (177), 7 states have call successors, (7), 7 states have call predecessors, (7), 7 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-08-27 07:17:01,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 193 transitions. [2021-08-27 07:17:01,435 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 193 transitions. Word has length 38 [2021-08-27 07:17:01,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:17:01,435 INFO L470 AbstractCegarLoop]: Abstraction has 155 states and 193 transitions. [2021-08-27 07:17:01,435 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:17:01,435 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 193 transitions. [2021-08-27 07:17:01,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-08-27 07:17:01,436 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:17:01,436 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:17:01,436 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-08-27 07:17:01,436 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting dll_remove_lastErr17REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:17:01,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:17:01,437 INFO L82 PathProgramCache]: Analyzing trace with hash -76822310, now seen corresponding path program 1 times [2021-08-27 07:17:01,437 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:17:01,437 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [177169672] [2021-08-27 07:17:01,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:01,437 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:17:01,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:01,625 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:17:01,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:01,647 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:17:01,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:01,700 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-27 07:17:01,700 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:17:01,700 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [177169672] [2021-08-27 07:17:01,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [177169672] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:17:01,700 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:17:01,700 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-08-27 07:17:01,701 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843846476] [2021-08-27 07:17:01,701 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-08-27 07:17:01,701 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:17:01,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-08-27 07:17:01,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=238, Unknown=0, NotChecked=0, Total=272 [2021-08-27 07:17:01,702 INFO L87 Difference]: Start difference. First operand 155 states and 193 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:17:02,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:17:02,520 INFO L93 Difference]: Finished difference Result 151 states and 181 transitions. [2021-08-27 07:17:02,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-08-27 07:17:02,520 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 39 [2021-08-27 07:17:02,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:17:02,521 INFO L225 Difference]: With dead ends: 151 [2021-08-27 07:17:02,521 INFO L226 Difference]: Without dead ends: 151 [2021-08-27 07:17:02,522 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 557.8ms TimeCoverageRelationStatistics Valid=162, Invalid=768, Unknown=0, NotChecked=0, Total=930 [2021-08-27 07:17:02,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-08-27 07:17:02,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 145. [2021-08-27 07:17:02,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 113 states have (on average 1.424778761061947) internal successors, (161), 132 states have internal predecessors, (161), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-08-27 07:17:02,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 175 transitions. [2021-08-27 07:17:02,526 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 175 transitions. Word has length 39 [2021-08-27 07:17:02,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:17:02,527 INFO L470 AbstractCegarLoop]: Abstraction has 145 states and 175 transitions. [2021-08-27 07:17:02,527 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:17:02,527 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 175 transitions. [2021-08-27 07:17:02,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-08-27 07:17:02,527 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:17:02,527 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:17:02,528 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-08-27 07:17:02,528 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting dll_remove_lastErr9REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:17:02,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:17:02,528 INFO L82 PathProgramCache]: Analyzing trace with hash -490962994, now seen corresponding path program 1 times [2021-08-27 07:17:02,528 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:17:02,529 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135958584] [2021-08-27 07:17:02,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:02,529 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:17:02,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:02,642 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:17:02,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:02,662 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:17:02,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:02,715 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-27 07:17:02,716 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:17:02,716 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135958584] [2021-08-27 07:17:02,716 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1135958584] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:17:02,716 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:17:02,716 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-08-27 07:17:02,717 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976117037] [2021-08-27 07:17:02,717 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-08-27 07:17:02,717 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:17:02,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-08-27 07:17:02,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-08-27 07:17:02,718 INFO L87 Difference]: Start difference. First operand 145 states and 175 transitions. Second operand has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-27 07:17:03,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:17:03,430 INFO L93 Difference]: Finished difference Result 173 states and 208 transitions. [2021-08-27 07:17:03,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-08-27 07:17:03,430 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 39 [2021-08-27 07:17:03,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:17:03,431 INFO L225 Difference]: With dead ends: 173 [2021-08-27 07:17:03,431 INFO L226 Difference]: Without dead ends: 173 [2021-08-27 07:17:03,432 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 383.6ms TimeCoverageRelationStatistics Valid=113, Invalid=589, Unknown=0, NotChecked=0, Total=702 [2021-08-27 07:17:03,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-08-27 07:17:03,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 149. [2021-08-27 07:17:03,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 117 states have (on average 1.4188034188034189) internal successors, (166), 136 states have internal predecessors, (166), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-08-27 07:17:03,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 180 transitions. [2021-08-27 07:17:03,437 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 180 transitions. Word has length 39 [2021-08-27 07:17:03,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:17:03,437 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 180 transitions. [2021-08-27 07:17:03,437 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-08-27 07:17:03,438 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 180 transitions. [2021-08-27 07:17:03,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-08-27 07:17:03,438 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:17:03,438 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:17:03,438 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-08-27 07:17:03,439 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting dll_remove_lastErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:17:03,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:17:03,439 INFO L82 PathProgramCache]: Analyzing trace with hash -2016451191, now seen corresponding path program 2 times [2021-08-27 07:17:03,439 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:17:03,439 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084812530] [2021-08-27 07:17:03,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:03,440 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:17:03,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:03,514 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:17:03,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:03,528 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:17:03,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:03,579 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 1 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:17:03,580 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:17:03,580 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084812530] [2021-08-27 07:17:03,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2084812530] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:03,580 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1380466138] [2021-08-27 07:17:03,580 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-27 07:17:03,581 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:17:03,581 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:17:03,585 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:17:03,587 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-08-27 07:17:03,881 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-27 07:17:03,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-27 07:17:03,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 6 conjunts are in the unsatisfiable core [2021-08-27 07:17:03,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:17:04,046 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:17:04,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1380466138] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:04,047 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:17:04,047 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 11 [2021-08-27 07:17:04,047 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353044544] [2021-08-27 07:17:04,047 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-08-27 07:17:04,048 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:17:04,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-08-27 07:17:04,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-08-27 07:17:04,048 INFO L87 Difference]: Start difference. First operand 149 states and 180 transitions. Second operand has 11 states, 9 states have (on average 4.888888888888889) internal successors, (44), 9 states have internal predecessors, (44), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-27 07:17:04,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:17:04,273 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2021-08-27 07:17:04,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-08-27 07:17:04,274 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 4.888888888888889) internal successors, (44), 9 states have internal predecessors, (44), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 40 [2021-08-27 07:17:04,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:17:04,274 INFO L225 Difference]: With dead ends: 100 [2021-08-27 07:17:04,275 INFO L226 Difference]: Without dead ends: 89 [2021-08-27 07:17:04,275 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 115.9ms TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-08-27 07:17:04,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-08-27 07:17:04,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-08-27 07:17:04,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 66 states have (on average 1.2878787878787878) internal successors, (85), 80 states have internal predecessors, (85), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-08-27 07:17:04,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 94 transitions. [2021-08-27 07:17:04,278 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 94 transitions. Word has length 40 [2021-08-27 07:17:04,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:17:04,278 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 94 transitions. [2021-08-27 07:17:04,278 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 4.888888888888889) internal successors, (44), 9 states have internal predecessors, (44), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-08-27 07:17:04,279 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 94 transitions. [2021-08-27 07:17:04,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-08-27 07:17:04,279 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:17:04,279 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:17:04,301 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-08-27 07:17:04,492 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-08-27 07:17:04,493 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting dll_remove_lastErr13REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:17:04,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:17:04,493 INFO L82 PathProgramCache]: Analyzing trace with hash -811741562, now seen corresponding path program 1 times [2021-08-27 07:17:04,493 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:17:04,493 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815065249] [2021-08-27 07:17:04,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:04,493 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:17:04,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:04,640 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:17:04,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:04,671 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:17:04,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:04,915 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:17:04,916 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:17:04,916 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815065249] [2021-08-27 07:17:04,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815065249] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:04,916 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [693701102] [2021-08-27 07:17:04,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:04,916 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:17:04,917 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:17:04,921 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:17:04,922 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-08-27 07:17:05,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:05,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 61 conjunts are in the unsatisfiable core [2021-08-27 07:17:05,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:17:05,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-27 07:17:05,294 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-08-27 07:17:05,294 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-08-27 07:17:05,327 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 13 treesize of output 9 [2021-08-27 07:17:05,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 23 [2021-08-27 07:17:05,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:17:05,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:17:05,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 18 treesize of output 22 [2021-08-27 07:17:05,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:17:05,466 INFO L354 Elim1Store]: treesize reduction 68, result has 21.8 percent of original size [2021-08-27 07:17:05,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 56 treesize of output 43 [2021-08-27 07:17:06,098 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 83 treesize of output 75 [2021-08-27 07:17:06,318 INFO L354 Elim1Store]: treesize reduction 42, result has 2.3 percent of original size [2021-08-27 07:17:06,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 73 treesize of output 25 [2021-08-27 07:17:06,326 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:17:06,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [693701102] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:06,327 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:17:06,327 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 30 [2021-08-27 07:17:06,327 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390649238] [2021-08-27 07:17:06,329 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-08-27 07:17:06,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:17:06,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-08-27 07:17:06,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=856, Unknown=0, NotChecked=0, Total=930 [2021-08-27 07:17:06,331 INFO L87 Difference]: Start difference. First operand 89 states and 94 transitions. Second operand has 31 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 25 states have internal predecessors, (59), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-08-27 07:17:08,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:17:08,097 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2021-08-27 07:17:08,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-08-27 07:17:08,099 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 25 states have internal predecessors, (59), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2021-08-27 07:17:08,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:17:08,099 INFO L225 Difference]: With dead ends: 102 [2021-08-27 07:17:08,099 INFO L226 Difference]: Without dead ends: 102 [2021-08-27 07:17:08,100 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 375 ImplicationChecksByTransitivity, 1670.1ms TimeCoverageRelationStatistics Valid=260, Invalid=2092, Unknown=0, NotChecked=0, Total=2352 [2021-08-27 07:17:08,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-08-27 07:17:08,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 91. [2021-08-27 07:17:08,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 68 states have (on average 1.2941176470588236) internal successors, (88), 82 states have internal predecessors, (88), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-08-27 07:17:08,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 97 transitions. [2021-08-27 07:17:08,103 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 97 transitions. Word has length 41 [2021-08-27 07:17:08,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:17:08,104 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 97 transitions. [2021-08-27 07:17:08,104 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 25 states have internal predecessors, (59), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-08-27 07:17:08,104 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 97 transitions. [2021-08-27 07:17:08,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-08-27 07:17:08,105 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:17:08,105 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:17:08,125 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-08-27 07:17:08,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:17:08,309 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting dll_remove_lastErr14REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:17:08,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:17:08,309 INFO L82 PathProgramCache]: Analyzing trace with hash -811741561, now seen corresponding path program 1 times [2021-08-27 07:17:08,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:17:08,309 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [510365911] [2021-08-27 07:17:08,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:08,309 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:17:08,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:08,538 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:17:08,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:08,572 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:17:08,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:08,918 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:17:08,919 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:17:08,919 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [510365911] [2021-08-27 07:17:08,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [510365911] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:08,919 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [827373405] [2021-08-27 07:17:08,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:08,919 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:17:08,920 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:17:08,920 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:17:08,939 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-08-27 07:17:09,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:09,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 76 conjunts are in the unsatisfiable core [2021-08-27 07:17:09,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:17:09,327 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-27 07:17:09,455 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-08-27 07:17:09,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-08-27 07:17:09,515 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 13 treesize of output 9 [2021-08-27 07:17:09,520 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 13 treesize of output 9 [2021-08-27 07:17:09,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:17:09,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-08-27 07:17:09,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:17:09,588 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-08-27 07:17:09,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:17:09,692 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-27 07:17:09,702 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-08-27 07:17:09,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 95 treesize of output 70 [2021-08-27 07:17:09,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:17:09,708 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-27 07:17:09,716 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-08-27 07:17:09,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 85 treesize of output 81 [2021-08-27 07:17:11,197 INFO L354 Elim1Store]: treesize reduction 65, result has 11.0 percent of original size [2021-08-27 07:17:11,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 140 treesize of output 73 [2021-08-27 07:17:11,212 INFO L354 Elim1Store]: treesize reduction 46, result has 6.1 percent of original size [2021-08-27 07:17:11,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 55 treesize of output 37 [2021-08-27 07:17:11,302 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:17:11,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [827373405] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:11,302 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:17:11,302 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 41 [2021-08-27 07:17:11,303 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098845664] [2021-08-27 07:17:11,303 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-08-27 07:17:11,303 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:17:11,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-08-27 07:17:11,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1626, Unknown=0, NotChecked=0, Total=1722 [2021-08-27 07:17:11,304 INFO L87 Difference]: Start difference. First operand 91 states and 97 transitions. Second operand has 42 states, 40 states have (on average 1.725) internal successors, (69), 36 states have internal predecessors, (69), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-08-27 07:17:15,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:17:15,296 INFO L93 Difference]: Finished difference Result 113 states and 120 transitions. [2021-08-27 07:17:15,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-08-27 07:17:15,296 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 40 states have (on average 1.725) internal successors, (69), 36 states have internal predecessors, (69), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2021-08-27 07:17:15,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:17:15,297 INFO L225 Difference]: With dead ends: 113 [2021-08-27 07:17:15,297 INFO L226 Difference]: Without dead ends: 113 [2021-08-27 07:17:15,298 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 592 ImplicationChecksByTransitivity, 3980.7ms TimeCoverageRelationStatistics Valid=346, Invalid=3686, Unknown=0, NotChecked=0, Total=4032 [2021-08-27 07:17:15,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-08-27 07:17:15,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 99. [2021-08-27 07:17:15,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 75 states have (on average 1.3066666666666666) internal successors, (98), 90 states have internal predecessors, (98), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-08-27 07:17:15,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 108 transitions. [2021-08-27 07:17:15,301 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 108 transitions. Word has length 41 [2021-08-27 07:17:15,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:17:15,302 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 108 transitions. [2021-08-27 07:17:15,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 40 states have (on average 1.725) internal successors, (69), 36 states have internal predecessors, (69), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-08-27 07:17:15,302 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 108 transitions. [2021-08-27 07:17:15,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-08-27 07:17:15,303 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:17:15,303 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:17:15,321 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-08-27 07:17:15,503 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-08-27 07:17:15,503 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting dll_remove_lastErr17REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:17:15,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:17:15,504 INFO L82 PathProgramCache]: Analyzing trace with hash 1600408080, now seen corresponding path program 1 times [2021-08-27 07:17:15,504 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:17:15,504 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695976485] [2021-08-27 07:17:15,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:15,504 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:17:15,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:15,580 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:17:15,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:15,599 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:17:15,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:15,611 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-08-27 07:17:15,612 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:17:15,612 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695976485] [2021-08-27 07:17:15,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [695976485] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:15,612 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [254135896] [2021-08-27 07:17:15,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:15,612 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:17:15,612 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:17:15,613 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:17:15,637 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-08-27 07:17:16,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:16,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 9 conjunts are in the unsatisfiable core [2021-08-27 07:17:16,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:17:16,179 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 7 treesize of output 3 [2021-08-27 07:17:16,200 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-08-27 07:17:16,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [254135896] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:16,200 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:17:16,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 3] total 8 [2021-08-27 07:17:16,201 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900837156] [2021-08-27 07:17:16,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-08-27 07:17:16,201 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:17:16,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-08-27 07:17:16,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-08-27 07:17:16,205 INFO L87 Difference]: Start difference. First operand 99 states and 108 transitions. Second operand has 9 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:17:16,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:17:16,555 INFO L93 Difference]: Finished difference Result 99 states and 106 transitions. [2021-08-27 07:17:16,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-08-27 07:17:16,555 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 43 [2021-08-27 07:17:16,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:17:16,556 INFO L225 Difference]: With dead ends: 99 [2021-08-27 07:17:16,556 INFO L226 Difference]: Without dead ends: 99 [2021-08-27 07:17:16,556 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 237.8ms TimeCoverageRelationStatistics Valid=81, Invalid=225, Unknown=0, NotChecked=0, Total=306 [2021-08-27 07:17:16,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-08-27 07:17:16,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2021-08-27 07:17:16,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 75 states have (on average 1.28) internal successors, (96), 89 states have internal predecessors, (96), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-08-27 07:17:16,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 106 transitions. [2021-08-27 07:17:16,559 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 106 transitions. Word has length 43 [2021-08-27 07:17:16,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:17:16,560 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 106 transitions. [2021-08-27 07:17:16,560 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-08-27 07:17:16,560 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 106 transitions. [2021-08-27 07:17:16,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-08-27 07:17:16,560 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:17:16,561 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:17:16,585 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-08-27 07:17:16,776 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-08-27 07:17:16,777 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting dll_remove_lastErr18REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:17:16,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:17:16,777 INFO L82 PathProgramCache]: Analyzing trace with hash 1600408081, now seen corresponding path program 1 times [2021-08-27 07:17:16,777 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:17:16,777 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1278349309] [2021-08-27 07:17:16,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:16,778 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:17:16,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:16,990 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:17:16,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:17,015 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:17:17,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:17,087 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-27 07:17:17,088 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:17:17,088 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1278349309] [2021-08-27 07:17:17,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1278349309] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:17,088 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47987073] [2021-08-27 07:17:17,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:17,089 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:17:17,089 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:17:17,097 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:17:17,098 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-08-27 07:17:17,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:17,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 11 conjunts are in the unsatisfiable core [2021-08-27 07:17:17,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:17:17,601 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 7 treesize of output 3 [2021-08-27 07:17:17,674 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-08-27 07:17:17,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47987073] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:17,675 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:17:17,675 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 3] total 17 [2021-08-27 07:17:17,675 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224527838] [2021-08-27 07:17:17,675 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-08-27 07:17:17,676 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:17:17,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-08-27 07:17:17,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=268, Unknown=0, NotChecked=0, Total=306 [2021-08-27 07:17:17,676 INFO L87 Difference]: Start difference. First operand 98 states and 106 transitions. Second operand has 18 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 14 states have internal predecessors, (59), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-08-27 07:17:18,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:17:18,762 INFO L93 Difference]: Finished difference Result 107 states and 114 transitions. [2021-08-27 07:17:18,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-08-27 07:17:18,763 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 14 states have internal predecessors, (59), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 43 [2021-08-27 07:17:18,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:17:18,763 INFO L225 Difference]: With dead ends: 107 [2021-08-27 07:17:18,763 INFO L226 Difference]: Without dead ends: 107 [2021-08-27 07:17:18,764 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 839.7ms TimeCoverageRelationStatistics Valid=248, Invalid=1234, Unknown=0, NotChecked=0, Total=1482 [2021-08-27 07:17:18,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-08-27 07:17:18,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 95. [2021-08-27 07:17:18,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 74 states have (on average 1.2432432432432432) internal successors, (92), 86 states have internal predecessors, (92), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-08-27 07:17:18,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 102 transitions. [2021-08-27 07:17:18,767 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 102 transitions. Word has length 43 [2021-08-27 07:17:18,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:17:18,768 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 102 transitions. [2021-08-27 07:17:18,768 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 14 states have internal predecessors, (59), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-08-27 07:17:18,768 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 102 transitions. [2021-08-27 07:17:18,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-08-27 07:17:18,769 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:17:18,769 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:17:18,787 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-08-27 07:17:18,972 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-08-27 07:17:18,973 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting mainErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:17:18,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:17:18,973 INFO L82 PathProgramCache]: Analyzing trace with hash -1924081036, now seen corresponding path program 1 times [2021-08-27 07:17:18,973 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:17:18,973 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [399326229] [2021-08-27 07:17:18,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:18,973 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:17:18,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:19,015 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:17:19,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:19,030 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:17:19,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:19,050 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-08-27 07:17:19,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:19,077 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-08-27 07:17:19,078 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:17:19,078 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [399326229] [2021-08-27 07:17:19,078 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [399326229] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:17:19,078 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:17:19,079 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-08-27 07:17:19,079 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952111541] [2021-08-27 07:17:19,079 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-08-27 07:17:19,079 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:17:19,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-08-27 07:17:19,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-08-27 07:17:19,080 INFO L87 Difference]: Start difference. First operand 95 states and 102 transitions. Second operand has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 5 states have internal predecessors, (31), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-08-27 07:17:19,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:17:19,329 INFO L93 Difference]: Finished difference Result 103 states and 114 transitions. [2021-08-27 07:17:19,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-08-27 07:17:19,330 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 5 states have internal predecessors, (31), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 44 [2021-08-27 07:17:19,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:17:19,330 INFO L225 Difference]: With dead ends: 103 [2021-08-27 07:17:19,330 INFO L226 Difference]: Without dead ends: 103 [2021-08-27 07:17:19,331 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 153.4ms TimeCoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2021-08-27 07:17:19,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-08-27 07:17:19,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-08-27 07:17:19,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 80 states have (on average 1.2375) internal successors, (99), 92 states have internal predecessors, (99), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-08-27 07:17:19,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 114 transitions. [2021-08-27 07:17:19,333 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 114 transitions. Word has length 44 [2021-08-27 07:17:19,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:17:19,334 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 114 transitions. [2021-08-27 07:17:19,334 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 5 states have internal predecessors, (31), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-08-27 07:17:19,334 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 114 transitions. [2021-08-27 07:17:19,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-08-27 07:17:19,334 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:17:19,334 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:17:19,335 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-08-27 07:17:19,335 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting dll_remove_lastErr20ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:17:19,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:17:19,335 INFO L82 PathProgramCache]: Analyzing trace with hash 393874640, now seen corresponding path program 1 times [2021-08-27 07:17:19,335 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:17:19,335 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1787409246] [2021-08-27 07:17:19,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:19,335 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:17:19,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:19,497 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:17:19,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:19,518 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:17:19,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:19,753 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:17:19,753 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:17:19,753 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1787409246] [2021-08-27 07:17:19,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1787409246] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:19,753 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1775884626] [2021-08-27 07:17:19,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:19,754 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:17:19,754 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:17:19,754 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:17:19,755 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-08-27 07:17:20,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:20,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 56 conjunts are in the unsatisfiable core [2021-08-27 07:17:20,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:17:20,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-27 07:17:20,318 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-08-27 07:17:20,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-08-27 07:17:20,364 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 13 treesize of output 9 [2021-08-27 07:17:20,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:17:20,410 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-08-27 07:17:20,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:17:20,496 INFO L354 Elim1Store]: treesize reduction 68, result has 21.8 percent of original size [2021-08-27 07:17:20,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 56 treesize of output 43 [2021-08-27 07:17:21,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 75 [2021-08-27 07:17:21,297 INFO L354 Elim1Store]: treesize reduction 42, result has 2.3 percent of original size [2021-08-27 07:17:21,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 73 treesize of output 25 [2021-08-27 07:17:21,326 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:17:21,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1775884626] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:21,327 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:17:21,327 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18] total 32 [2021-08-27 07:17:21,327 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867683077] [2021-08-27 07:17:21,327 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-08-27 07:17:21,327 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:17:21,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-08-27 07:17:21,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=972, Unknown=0, NotChecked=0, Total=1056 [2021-08-27 07:17:21,328 INFO L87 Difference]: Start difference. First operand 103 states and 114 transitions. Second operand has 33 states, 31 states have (on average 2.064516129032258) internal successors, (64), 27 states have internal predecessors, (64), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-08-27 07:17:23,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:17:23,095 INFO L93 Difference]: Finished difference Result 112 states and 123 transitions. [2021-08-27 07:17:23,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-08-27 07:17:23,096 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 2.064516129032258) internal successors, (64), 27 states have internal predecessors, (64), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 45 [2021-08-27 07:17:23,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:17:23,097 INFO L225 Difference]: With dead ends: 112 [2021-08-27 07:17:23,097 INFO L226 Difference]: Without dead ends: 112 [2021-08-27 07:17:23,097 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 398 ImplicationChecksByTransitivity, 1610.4ms TimeCoverageRelationStatistics Valid=261, Invalid=2189, Unknown=0, NotChecked=0, Total=2450 [2021-08-27 07:17:23,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-08-27 07:17:23,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 103. [2021-08-27 07:17:23,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 80 states have (on average 1.225) internal successors, (98), 92 states have internal predecessors, (98), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-08-27 07:17:23,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 113 transitions. [2021-08-27 07:17:23,100 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 113 transitions. Word has length 45 [2021-08-27 07:17:23,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:17:23,100 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 113 transitions. [2021-08-27 07:17:23,100 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 2.064516129032258) internal successors, (64), 27 states have internal predecessors, (64), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-08-27 07:17:23,100 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 113 transitions. [2021-08-27 07:17:23,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-08-27 07:17:23,101 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:17:23,101 INFO L512 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] [2021-08-27 07:17:23,121 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-08-27 07:17:23,309 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-08-27 07:17:23,309 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting dll_remove_lastErr13REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:17:23,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:17:23,312 INFO L82 PathProgramCache]: Analyzing trace with hash 393927228, now seen corresponding path program 2 times [2021-08-27 07:17:23,313 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:17:23,313 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103728305] [2021-08-27 07:17:23,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:23,313 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:17:23,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:23,638 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:17:23,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:23,666 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:17:23,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:24,241 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:17:24,242 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:17:24,242 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103728305] [2021-08-27 07:17:24,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [103728305] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:24,242 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182722303] [2021-08-27 07:17:24,242 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-08-27 07:17:24,242 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:17:24,242 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:17:24,243 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:17:24,244 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-08-27 07:17:24,730 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-08-27 07:17:24,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-08-27 07:17:24,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 87 conjunts are in the unsatisfiable core [2021-08-27 07:17:24,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:17:24,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-27 07:17:24,846 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 13 treesize of output 9 [2021-08-27 07:17:24,852 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 13 treesize of output 9 [2021-08-27 07:17:24,884 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 0 case distinctions, treesize of input 28 treesize of output 23 [2021-08-27 07:17:24,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:17:24,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:17:24,896 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 18 treesize of output 22 [2021-08-27 07:17:24,902 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 0 case distinctions, treesize of input 28 treesize of output 23 [2021-08-27 07:17:24,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:17:24,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:17:24,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 18 treesize of output 22 [2021-08-27 07:17:25,054 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-08-27 07:17:25,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-08-27 07:17:25,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2021-08-27 07:17:25,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 21 [2021-08-27 07:17:25,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2021-08-27 07:17:25,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2021-08-27 07:17:25,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:17:25,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2021-08-27 07:17:25,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:17:25,267 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2021-08-27 07:17:25,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:17:25,410 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-27 07:17:25,411 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-27 07:17:25,421 INFO L354 Elim1Store]: treesize reduction 35, result has 20.5 percent of original size [2021-08-27 07:17:25,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 136 treesize of output 92 [2021-08-27 07:17:25,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:17:25,428 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-27 07:17:25,430 INFO L173 IndexEqualityManager]: detected equality via solver [2021-08-27 07:17:25,440 INFO L354 Elim1Store]: treesize reduction 59, result has 13.2 percent of original size [2021-08-27 07:17:25,441 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 113 treesize of output 102 [2021-08-27 07:17:27,100 INFO L354 Elim1Store]: treesize reduction 166, result has 6.2 percent of original size [2021-08-27 07:17:27,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 3 disjoint index pairs (out of 21 index pairs), introduced 11 new quantified variables, introduced 21 case distinctions, treesize of input 197 treesize of output 105 [2021-08-27 07:17:27,136 INFO L354 Elim1Store]: treesize reduction 126, result has 5.3 percent of original size [2021-08-27 07:17:27,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 3 disjoint index pairs (out of 21 index pairs), introduced 9 new quantified variables, introduced 21 case distinctions, treesize of input 66 treesize of output 46 [2021-08-27 07:17:27,188 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:17:27,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [182722303] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:27,188 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:17:27,189 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 46 [2021-08-27 07:17:27,189 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [168207489] [2021-08-27 07:17:27,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-08-27 07:17:27,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:17:27,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-08-27 07:17:27,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1941, Unknown=0, NotChecked=0, Total=2070 [2021-08-27 07:17:27,190 INFO L87 Difference]: Start difference. First operand 103 states and 113 transitions. Second operand has 46 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 40 states have internal predecessors, (73), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-08-27 07:17:32,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:17:32,002 INFO L93 Difference]: Finished difference Result 103 states and 111 transitions. [2021-08-27 07:17:32,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-08-27 07:17:32,002 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 40 states have internal predecessors, (73), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 45 [2021-08-27 07:17:32,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:17:32,003 INFO L225 Difference]: With dead ends: 103 [2021-08-27 07:17:32,003 INFO L226 Difference]: Without dead ends: 103 [2021-08-27 07:17:32,004 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 28 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 958 ImplicationChecksByTransitivity, 3416.0ms TimeCoverageRelationStatistics Valid=360, Invalid=4196, Unknown=0, NotChecked=0, Total=4556 [2021-08-27 07:17:32,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-08-27 07:17:32,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-08-27 07:17:32,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 80 states have (on average 1.2125) internal successors, (97), 92 states have internal predecessors, (97), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (8), 4 states have call predecessors, (8), 5 states have call successors, (8) [2021-08-27 07:17:32,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 111 transitions. [2021-08-27 07:17:32,007 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 111 transitions. Word has length 45 [2021-08-27 07:17:32,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:17:32,008 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 111 transitions. [2021-08-27 07:17:32,008 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 40 states have internal predecessors, (73), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-08-27 07:17:32,008 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 111 transitions. [2021-08-27 07:17:32,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-08-27 07:17:32,008 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:17:32,009 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:17:32,032 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-08-27 07:17:32,216 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:17:32,217 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting mainErr2ASSERT_VIOLATIONMEMORY_LEAK === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:17:32,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:17:32,217 INFO L82 PathProgramCache]: Analyzing trace with hash 2089031702, now seen corresponding path program 1 times [2021-08-27 07:17:32,217 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:17:32,217 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949564970] [2021-08-27 07:17:32,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:32,218 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:17:32,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:32,273 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:17:32,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:32,289 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:17:32,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:32,310 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-08-27 07:17:32,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:32,316 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-08-27 07:17:32,317 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:17:32,317 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949564970] [2021-08-27 07:17:32,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [949564970] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:32,317 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045585976] [2021-08-27 07:17:32,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:32,317 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:17:32,318 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:17:32,319 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:17:32,346 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-08-27 07:17:32,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:32,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 4 conjunts are in the unsatisfiable core [2021-08-27 07:17:32,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:17:33,053 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-08-27 07:17:33,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045585976] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:33,054 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:17:33,054 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 9 [2021-08-27 07:17:33,054 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822053130] [2021-08-27 07:17:33,054 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-08-27 07:17:33,054 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:17:33,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-08-27 07:17:33,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-08-27 07:17:33,055 INFO L87 Difference]: Start difference. First operand 103 states and 111 transitions. Second operand has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 6 states have internal predecessors, (38), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-08-27 07:17:33,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:17:33,268 INFO L93 Difference]: Finished difference Result 107 states and 115 transitions. [2021-08-27 07:17:33,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-08-27 07:17:33,269 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 6 states have internal predecessors, (38), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 46 [2021-08-27 07:17:33,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:17:33,270 INFO L225 Difference]: With dead ends: 107 [2021-08-27 07:17:33,270 INFO L226 Difference]: Without dead ends: 107 [2021-08-27 07:17:33,270 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 86.3ms TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-08-27 07:17:33,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-08-27 07:17:33,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2021-08-27 07:17:33,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 84 states have (on average 1.2023809523809523) internal successors, (101), 94 states have internal predecessors, (101), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) [2021-08-27 07:17:33,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 115 transitions. [2021-08-27 07:17:33,274 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 115 transitions. Word has length 46 [2021-08-27 07:17:33,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:17:33,274 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 115 transitions. [2021-08-27 07:17:33,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 6 states have internal predecessors, (38), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-08-27 07:17:33,274 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 115 transitions. [2021-08-27 07:17:33,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-08-27 07:17:33,275 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:17:33,275 INFO L512 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, 1, 1] [2021-08-27 07:17:33,297 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-08-27 07:17:33,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-08-27 07:17:33,481 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting dll_remove_lastErr2REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:17:33,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:17:33,481 INFO L82 PathProgramCache]: Analyzing trace with hash 339086038, now seen corresponding path program 1 times [2021-08-27 07:17:33,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:17:33,481 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854634247] [2021-08-27 07:17:33,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:33,482 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:17:33,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:33,536 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:17:33,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:33,554 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:17:33,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:33,755 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-08-27 07:17:33,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:33,981 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:17:33,981 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:17:33,982 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854634247] [2021-08-27 07:17:33,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1854634247] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:33,982 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [396561961] [2021-08-27 07:17:33,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:33,982 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:17:33,982 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:17:33,988 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:17:33,990 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-08-27 07:17:34,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:34,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 47 conjunts are in the unsatisfiable core [2021-08-27 07:17:34,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:17:34,659 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 6 treesize of output 5 [2021-08-27 07:17:34,746 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-08-27 07:17:34,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-08-27 07:17:34,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-08-27 07:17:34,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-08-27 07:17:34,911 INFO L354 Elim1Store]: treesize reduction 56, result has 21.1 percent of original size [2021-08-27 07:17:34,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 45 treesize of output 38 [2021-08-27 07:17:35,519 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 25 treesize of output 17 [2021-08-27 07:17:35,581 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:17:35,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [396561961] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:35,582 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:17:35,582 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 20] total 39 [2021-08-27 07:17:35,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110044508] [2021-08-27 07:17:35,583 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-08-27 07:17:35,583 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:17:35,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-08-27 07:17:35,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1377, Unknown=0, NotChecked=0, Total=1482 [2021-08-27 07:17:35,584 INFO L87 Difference]: Start difference. First operand 107 states and 115 transitions. Second operand has 39 states, 38 states have (on average 1.868421052631579) internal successors, (71), 33 states have internal predecessors, (71), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-08-27 07:17:37,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:17:37,164 INFO L93 Difference]: Finished difference Result 105 states and 112 transitions. [2021-08-27 07:17:37,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-08-27 07:17:37,165 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.868421052631579) internal successors, (71), 33 states have internal predecessors, (71), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 47 [2021-08-27 07:17:37,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:17:37,165 INFO L225 Difference]: With dead ends: 105 [2021-08-27 07:17:37,166 INFO L226 Difference]: Without dead ends: 100 [2021-08-27 07:17:37,167 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 1610.7ms TimeCoverageRelationStatistics Valid=331, Invalid=3091, Unknown=0, NotChecked=0, Total=3422 [2021-08-27 07:17:37,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-08-27 07:17:37,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-08-27 07:17:37,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 77 states have (on average 1.2077922077922079) internal successors, (93), 88 states have internal predecessors, (93), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-08-27 07:17:37,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 106 transitions. [2021-08-27 07:17:37,173 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 106 transitions. Word has length 47 [2021-08-27 07:17:37,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:17:37,173 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 106 transitions. [2021-08-27 07:17:37,174 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 1.868421052631579) internal successors, (71), 33 states have internal predecessors, (71), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-08-27 07:17:37,174 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 106 transitions. [2021-08-27 07:17:37,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-08-27 07:17:37,174 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:17:37,174 INFO L512 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:17:37,207 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-08-27 07:17:37,392 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:17:37,393 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting dll_remove_lastErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:17:37,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:17:37,393 INFO L82 PathProgramCache]: Analyzing trace with hash -1172150217, now seen corresponding path program 1 times [2021-08-27 07:17:37,393 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:17:37,393 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1655562949] [2021-08-27 07:17:37,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:37,393 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:17:37,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:37,462 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:17:37,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:37,480 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:17:37,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:37,503 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-08-27 07:17:37,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:37,594 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-08-27 07:17:37,595 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:17:37,595 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1655562949] [2021-08-27 07:17:37,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1655562949] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:37,595 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [838739669] [2021-08-27 07:17:37,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:37,595 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:17:37,596 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:17:37,597 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:17:37,597 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-08-27 07:17:38,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:38,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 21 conjunts are in the unsatisfiable core [2021-08-27 07:17:38,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:17:38,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-08-27 07:17:38,299 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 9 treesize of output 7 [2021-08-27 07:17:38,515 INFO L354 Elim1Store]: treesize reduction 50, result has 9.1 percent of original size [2021-08-27 07:17:38,515 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 20 treesize of output 19 [2021-08-27 07:17:38,573 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 9 treesize of output 7 [2021-08-27 07:17:38,702 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-08-27 07:17:38,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 17 treesize of output 19 [2021-08-27 07:17:38,847 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-08-27 07:17:38,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [838739669] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:38,848 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:17:38,848 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 24 [2021-08-27 07:17:38,848 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986723376] [2021-08-27 07:17:38,848 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-08-27 07:17:38,849 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:17:38,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-08-27 07:17:38,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=528, Unknown=0, NotChecked=0, Total=600 [2021-08-27 07:17:38,849 INFO L87 Difference]: Start difference. First operand 100 states and 106 transitions. Second operand has 25 states, 24 states have (on average 3.4166666666666665) internal successors, (82), 21 states have internal predecessors, (82), 5 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-08-27 07:17:39,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:17:39,930 INFO L93 Difference]: Finished difference Result 126 states and 135 transitions. [2021-08-27 07:17:39,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-08-27 07:17:39,931 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.4166666666666665) internal successors, (82), 21 states have internal predecessors, (82), 5 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 53 [2021-08-27 07:17:39,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:17:39,932 INFO L225 Difference]: With dead ends: 126 [2021-08-27 07:17:39,932 INFO L226 Difference]: Without dead ends: 126 [2021-08-27 07:17:39,932 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 855.3ms TimeCoverageRelationStatistics Valid=233, Invalid=1249, Unknown=0, NotChecked=0, Total=1482 [2021-08-27 07:17:39,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-08-27 07:17:39,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 90. [2021-08-27 07:17:39,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 71 states have (on average 1.1830985915492958) internal successors, (84), 80 states have internal predecessors, (84), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-08-27 07:17:39,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 93 transitions. [2021-08-27 07:17:39,935 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 93 transitions. Word has length 53 [2021-08-27 07:17:39,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:17:39,936 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 93 transitions. [2021-08-27 07:17:39,936 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.4166666666666665) internal successors, (82), 21 states have internal predecessors, (82), 5 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-08-27 07:17:39,936 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 93 transitions. [2021-08-27 07:17:39,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-08-27 07:17:39,936 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:17:39,937 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:17:39,964 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-08-27 07:17:40,153 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:17:40,153 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting dll_remove_lastErr2REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:17:40,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:17:40,154 INFO L82 PathProgramCache]: Analyzing trace with hash -1976918352, now seen corresponding path program 1 times [2021-08-27 07:17:40,154 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:17:40,154 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1381929540] [2021-08-27 07:17:40,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:40,154 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:17:40,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:40,265 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:17:40,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:40,284 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:17:40,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:40,372 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-08-27 07:17:40,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:41,217 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-27 07:17:41,217 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:17:41,217 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1381929540] [2021-08-27 07:17:41,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1381929540] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:41,217 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529250116] [2021-08-27 07:17:41,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:17:41,217 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:17:41,217 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:17:41,221 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:17:41,248 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-08-27 07:17:41,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:17:41,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 65 conjunts are in the unsatisfiable core [2021-08-27 07:17:41,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:17:41,999 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 6 treesize of output 5 [2021-08-27 07:17:42,110 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-08-27 07:17:42,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-08-27 07:17:42,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-08-27 07:17:42,268 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-08-27 07:17:42,377 INFO L354 Elim1Store]: treesize reduction 56, result has 21.1 percent of original size [2021-08-27 07:17:42,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 54 treesize of output 43 [2021-08-27 07:17:46,219 INFO L354 Elim1Store]: treesize reduction 186, result has 19.8 percent of original size [2021-08-27 07:17:46,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 126 treesize of output 99 [2021-08-27 07:17:46,238 INFO L354 Elim1Store]: treesize reduction 48, result has 28.4 percent of original size [2021-08-27 07:17:46,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 109 treesize of output 118 [2021-08-27 07:17:48,504 INFO L354 Elim1Store]: treesize reduction 106, result has 17.8 percent of original size [2021-08-27 07:17:48,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 3 disjoint index pairs (out of 15 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 111 treesize of output 80 [2021-08-27 07:17:48,713 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:17:48,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529250116] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:17:48,714 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:17:48,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 52 [2021-08-27 07:17:48,714 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925321135] [2021-08-27 07:17:48,714 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-08-27 07:17:48,714 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:17:48,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-08-27 07:17:48,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2617, Unknown=1, NotChecked=0, Total=2756 [2021-08-27 07:17:48,716 INFO L87 Difference]: Start difference. First operand 90 states and 93 transitions. Second operand has 53 states, 50 states have (on average 1.82) internal successors, (91), 45 states have internal predecessors, (91), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-08-27 07:18:58,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:18:58,706 INFO L93 Difference]: Finished difference Result 140 states and 148 transitions. [2021-08-27 07:18:58,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-08-27 07:18:58,707 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 50 states have (on average 1.82) internal successors, (91), 45 states have internal predecessors, (91), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 54 [2021-08-27 07:18:58,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:18:58,707 INFO L225 Difference]: With dead ends: 140 [2021-08-27 07:18:58,710 INFO L226 Difference]: Without dead ends: 140 [2021-08-27 07:18:58,713 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2529 ImplicationChecksByTransitivity, 48224.1ms TimeCoverageRelationStatistics Valid=1228, Invalid=10955, Unknown=27, NotChecked=0, Total=12210 [2021-08-27 07:18:58,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-08-27 07:18:58,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 94. [2021-08-27 07:18:58,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 74 states have (on average 1.1891891891891893) internal successors, (88), 83 states have internal predecessors, (88), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-08-27 07:18:58,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 99 transitions. [2021-08-27 07:18:58,715 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 99 transitions. Word has length 54 [2021-08-27 07:18:58,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:18:58,716 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 99 transitions. [2021-08-27 07:18:58,716 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 50 states have (on average 1.82) internal successors, (91), 45 states have internal predecessors, (91), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-08-27 07:18:58,716 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 99 transitions. [2021-08-27 07:18:58,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-08-27 07:18:58,717 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:18:58,717 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:18:58,740 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-08-27 07:18:58,928 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:18:58,929 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting dll_remove_lastErr3REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:18:58,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:18:58,929 INFO L82 PathProgramCache]: Analyzing trace with hash -1976918351, now seen corresponding path program 1 times [2021-08-27 07:18:58,929 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:18:58,929 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [327396684] [2021-08-27 07:18:58,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:18:58,930 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:18:58,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:18:59,059 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:18:59,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:18:59,085 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:18:59,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:18:59,192 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-08-27 07:18:59,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:18:59,393 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-27 07:18:59,394 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:18:59,394 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [327396684] [2021-08-27 07:18:59,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [327396684] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:18:59,394 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [181132489] [2021-08-27 07:18:59,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:18:59,394 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:18:59,395 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:18:59,395 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:18:59,421 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-08-27 07:19:00,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:19:00,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 53 conjunts are in the unsatisfiable core [2021-08-27 07:19:00,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:19:00,921 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-08-27 07:19:00,921 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 67 treesize of output 72 [2021-08-27 07:19:01,273 INFO L354 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2021-08-27 07:19:01,274 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 45 [2021-08-27 07:19:01,550 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-08-27 07:19:01,550 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 51 [2021-08-27 07:19:01,555 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-08-27 07:19:01,555 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 42 treesize of output 24 [2021-08-27 07:19:01,592 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-27 07:19:01,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [181132489] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:19:01,592 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:19:01,592 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 37 [2021-08-27 07:19:01,592 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660613339] [2021-08-27 07:19:01,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-08-27 07:19:01,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:19:01,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-08-27 07:19:01,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1304, Unknown=0, NotChecked=0, Total=1406 [2021-08-27 07:19:01,593 INFO L87 Difference]: Start difference. First operand 94 states and 99 transitions. Second operand has 38 states, 35 states have (on average 2.4) internal successors, (84), 30 states have internal predecessors, (84), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-08-27 07:19:09,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:19:09,815 INFO L93 Difference]: Finished difference Result 154 states and 164 transitions. [2021-08-27 07:19:09,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-08-27 07:19:09,817 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 35 states have (on average 2.4) internal successors, (84), 30 states have internal predecessors, (84), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 54 [2021-08-27 07:19:09,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:19:09,818 INFO L225 Difference]: With dead ends: 154 [2021-08-27 07:19:09,818 INFO L226 Difference]: Without dead ends: 154 [2021-08-27 07:19:09,820 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 936 ImplicationChecksByTransitivity, 5885.8ms TimeCoverageRelationStatistics Valid=718, Invalid=4831, Unknown=1, NotChecked=0, Total=5550 [2021-08-27 07:19:09,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-08-27 07:19:09,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 125. [2021-08-27 07:19:09,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 102 states have (on average 1.2647058823529411) internal successors, (129), 112 states have internal predecessors, (129), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-08-27 07:19:09,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 145 transitions. [2021-08-27 07:19:09,823 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 145 transitions. Word has length 54 [2021-08-27 07:19:09,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:19:09,824 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 145 transitions. [2021-08-27 07:19:09,824 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 35 states have (on average 2.4) internal successors, (84), 30 states have internal predecessors, (84), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-08-27 07:19:09,824 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 145 transitions. [2021-08-27 07:19:09,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-08-27 07:19:09,825 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:19:09,825 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:19:09,853 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-08-27 07:19:10,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:19:10,039 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting dll_remove_lastErr14REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:19:10,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:19:10,039 INFO L82 PathProgramCache]: Analyzing trace with hash 560464247, now seen corresponding path program 1 times [2021-08-27 07:19:10,039 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:19:10,040 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1539612204] [2021-08-27 07:19:10,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:19:10,040 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:19:10,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:19:10,242 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:19:10,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:19:10,265 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:19:10,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:19:10,391 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-08-27 07:19:10,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:19:10,562 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-27 07:19:10,562 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:19:10,562 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1539612204] [2021-08-27 07:19:10,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1539612204] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:19:10,562 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [721779091] [2021-08-27 07:19:10,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:19:10,563 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:19:10,564 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:19:10,565 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:19:10,570 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-08-27 07:19:11,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:19:11,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 15 conjunts are in the unsatisfiable core [2021-08-27 07:19:11,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:19:11,628 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 39 treesize of output 31 [2021-08-27 07:19:11,630 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 28 treesize of output 16 [2021-08-27 07:19:11,686 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-08-27 07:19:11,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [721779091] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:19:11,687 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-08-27 07:19:11,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [21] total 25 [2021-08-27 07:19:11,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317457540] [2021-08-27 07:19:11,687 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-08-27 07:19:11,688 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:19:11,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-08-27 07:19:11,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=588, Unknown=0, NotChecked=0, Total=650 [2021-08-27 07:19:11,688 INFO L87 Difference]: Start difference. First operand 125 states and 145 transitions. Second operand has 6 states, 5 states have (on average 8.2) internal successors, (41), 6 states have internal predecessors, (41), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-08-27 07:19:11,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:19:11,819 INFO L93 Difference]: Finished difference Result 127 states and 147 transitions. [2021-08-27 07:19:11,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-08-27 07:19:11,825 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 8.2) internal successors, (41), 6 states have internal predecessors, (41), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 58 [2021-08-27 07:19:11,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:19:11,826 INFO L225 Difference]: With dead ends: 127 [2021-08-27 07:19:11,826 INFO L226 Difference]: Without dead ends: 127 [2021-08-27 07:19:11,830 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 462.4ms TimeCoverageRelationStatistics Valid=74, Invalid=738, Unknown=0, NotChecked=0, Total=812 [2021-08-27 07:19:11,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-08-27 07:19:11,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 125. [2021-08-27 07:19:11,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 102 states have (on average 1.2450980392156863) internal successors, (127), 112 states have internal predecessors, (127), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-08-27 07:19:11,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 143 transitions. [2021-08-27 07:19:11,834 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 143 transitions. Word has length 58 [2021-08-27 07:19:11,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:19:11,834 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 143 transitions. [2021-08-27 07:19:11,834 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 8.2) internal successors, (41), 6 states have internal predecessors, (41), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-08-27 07:19:11,835 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 143 transitions. [2021-08-27 07:19:11,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-08-27 07:19:11,835 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:19:11,835 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:19:11,859 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-08-27 07:19:12,048 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-08-27 07:19:12,049 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting dll_remove_lastErr7ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:19:12,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:19:12,049 INFO L82 PathProgramCache]: Analyzing trace with hash 560033297, now seen corresponding path program 1 times [2021-08-27 07:19:12,049 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:19:12,049 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1006242986] [2021-08-27 07:19:12,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:19:12,050 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:19:12,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:19:12,154 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:19:12,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:19:12,173 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:19:12,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:19:12,260 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-08-27 07:19:12,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:19:12,396 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-27 07:19:12,397 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:19:12,397 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1006242986] [2021-08-27 07:19:12,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1006242986] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:19:12,397 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547765350] [2021-08-27 07:19:12,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:19:12,397 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:19:12,397 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:19:12,398 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:19:12,400 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-08-27 07:19:13,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:19:13,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 41 conjunts are in the unsatisfiable core [2021-08-27 07:19:13,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:19:13,445 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 13 treesize of output 9 [2021-08-27 07:19:14,283 WARN L860 $PredicateComparison]: unable to prove that (exists ((dll_remove_last_~snd_to_last~0.offset Int)) (= (let ((.cse0 (select (select |c_old(#memory_$Pointer$.base)| |c_dll_remove_last_#in~head.base|) |c_dll_remove_last_#in~head.offset|))) (store |c_old(#memory_$Pointer$.base)| .cse0 (store (select |c_old(#memory_$Pointer$.base)| .cse0) (+ dll_remove_last_~snd_to_last~0.offset 4) 0))) |c_#memory_$Pointer$.base|)) is different from true [2021-08-27 07:19:14,320 INFO L354 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2021-08-27 07:19:14,320 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 25 [2021-08-27 07:19:14,525 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-08-27 07:19:14,526 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 18 [2021-08-27 07:19:14,534 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-27 07:19:14,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [547765350] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:19:14,534 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:19:14,534 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17] total 28 [2021-08-27 07:19:14,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856524714] [2021-08-27 07:19:14,535 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-08-27 07:19:14,535 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:19:14,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-08-27 07:19:14,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=671, Unknown=1, NotChecked=52, Total=812 [2021-08-27 07:19:14,536 INFO L87 Difference]: Start difference. First operand 125 states and 143 transitions. Second operand has 29 states, 26 states have (on average 2.8076923076923075) internal successors, (73), 21 states have internal predecessors, (73), 7 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-08-27 07:19:58,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:19:58,819 INFO L93 Difference]: Finished difference Result 151 states and 161 transitions. [2021-08-27 07:19:58,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-08-27 07:19:58,819 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 26 states have (on average 2.8076923076923075) internal successors, (73), 21 states have internal predecessors, (73), 7 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 58 [2021-08-27 07:19:58,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:19:58,820 INFO L225 Difference]: With dead ends: 151 [2021-08-27 07:19:58,821 INFO L226 Difference]: Without dead ends: 151 [2021-08-27 07:19:58,830 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 666 ImplicationChecksByTransitivity, 44571.1ms TimeCoverageRelationStatistics Valid=503, Invalid=2851, Unknown=72, NotChecked=114, Total=3540 [2021-08-27 07:19:58,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-08-27 07:19:58,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 128. [2021-08-27 07:19:58,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 105 states have (on average 1.2380952380952381) internal successors, (130), 115 states have internal predecessors, (130), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-08-27 07:19:58,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 146 transitions. [2021-08-27 07:19:58,835 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 146 transitions. Word has length 58 [2021-08-27 07:19:58,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:19:58,836 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 146 transitions. [2021-08-27 07:19:58,836 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 26 states have (on average 2.8076923076923075) internal successors, (73), 21 states have internal predecessors, (73), 7 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-08-27 07:19:58,836 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 146 transitions. [2021-08-27 07:19:58,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-08-27 07:19:58,837 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:19:58,837 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:19:58,868 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-08-27 07:19:59,058 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-08-27 07:19:59,058 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting dll_remove_lastErr9REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:19:59,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:19:59,059 INFO L82 PathProgramCache]: Analyzing trace with hash 1321089012, now seen corresponding path program 1 times [2021-08-27 07:19:59,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:19:59,059 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3826844] [2021-08-27 07:19:59,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:19:59,059 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:19:59,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:19:59,169 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:19:59,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:19:59,192 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:19:59,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:19:59,219 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-08-27 07:19:59,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:19:59,229 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-08-27 07:19:59,229 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:19:59,229 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3826844] [2021-08-27 07:19:59,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [3826844] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:19:59,229 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888086521] [2021-08-27 07:19:59,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:19:59,230 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:19:59,230 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:19:59,231 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:19:59,232 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-08-27 07:20:00,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:00,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 8 conjunts are in the unsatisfiable core [2021-08-27 07:20:00,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:20:00,349 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-08-27 07:20:00,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 17 treesize of output 19 [2021-08-27 07:20:00,372 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-08-27 07:20:00,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1888086521] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:20:00,373 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-08-27 07:20:00,373 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [11] total 13 [2021-08-27 07:20:00,373 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021160828] [2021-08-27 07:20:00,373 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-08-27 07:20:00,373 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:20:00,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-08-27 07:20:00,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-08-27 07:20:00,374 INFO L87 Difference]: Start difference. First operand 128 states and 146 transitions. Second operand has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-08-27 07:20:00,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:20:00,510 INFO L93 Difference]: Finished difference Result 129 states and 149 transitions. [2021-08-27 07:20:00,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-08-27 07:20:00,511 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 60 [2021-08-27 07:20:00,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:20:00,512 INFO L225 Difference]: With dead ends: 129 [2021-08-27 07:20:00,512 INFO L226 Difference]: Without dead ends: 129 [2021-08-27 07:20:00,512 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 152.6ms TimeCoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2021-08-27 07:20:00,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-08-27 07:20:00,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 127. [2021-08-27 07:20:00,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 105 states have (on average 1.2285714285714286) internal successors, (129), 114 states have internal predecessors, (129), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-08-27 07:20:00,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 145 transitions. [2021-08-27 07:20:00,515 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 145 transitions. Word has length 60 [2021-08-27 07:20:00,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:20:00,516 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 145 transitions. [2021-08-27 07:20:00,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-08-27 07:20:00,516 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 145 transitions. [2021-08-27 07:20:00,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-08-27 07:20:00,517 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:20:00,517 INFO L512 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:20:00,549 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-08-27 07:20:00,736 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:20:00,736 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting dll_remove_lastErr13REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:20:00,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:20:00,737 INFO L82 PathProgramCache]: Analyzing trace with hash 1108481324, now seen corresponding path program 1 times [2021-08-27 07:20:00,737 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:20:00,737 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764236725] [2021-08-27 07:20:00,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:20:00,737 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:20:00,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:00,960 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:20:00,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:00,988 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:20:00,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:01,091 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-08-27 07:20:01,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:01,341 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 13 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-27 07:20:01,341 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:20:01,341 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764236725] [2021-08-27 07:20:01,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [764236725] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:20:01,345 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1797599066] [2021-08-27 07:20:01,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:20:01,345 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:20:01,345 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:20:01,346 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:20:01,348 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-08-27 07:20:02,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:02,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 74 conjunts are in the unsatisfiable core [2021-08-27 07:20:02,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:20:03,047 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-08-27 07:20:03,047 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 68 treesize of output 70 [2021-08-27 07:20:03,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 117 treesize of output 116 [2021-08-27 07:20:03,349 INFO L354 Elim1Store]: treesize reduction 55, result has 11.3 percent of original size [2021-08-27 07:20:03,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 71 treesize of output 47 [2021-08-27 07:20:03,638 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-08-27 07:20:03,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-08-27 07:20:03,906 INFO L354 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2021-08-27 07:20:03,906 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 78 treesize of output 41 [2021-08-27 07:20:03,922 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-08-27 07:20:03,922 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 20 [2021-08-27 07:20:03,968 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-27 07:20:03,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1797599066] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:20:03,968 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:20:03,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 24] total 44 [2021-08-27 07:20:03,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562643342] [2021-08-27 07:20:03,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-08-27 07:20:03,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:20:03,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-08-27 07:20:03,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1784, Unknown=0, NotChecked=0, Total=1892 [2021-08-27 07:20:03,970 INFO L87 Difference]: Start difference. First operand 127 states and 145 transitions. Second operand has 44 states, 42 states have (on average 2.3095238095238093) internal successors, (97), 36 states have internal predecessors, (97), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-08-27 07:20:07,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:20:07,971 INFO L93 Difference]: Finished difference Result 117 states and 121 transitions. [2021-08-27 07:20:07,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-08-27 07:20:07,972 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 42 states have (on average 2.3095238095238093) internal successors, (97), 36 states have internal predecessors, (97), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 62 [2021-08-27 07:20:07,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:20:07,973 INFO L225 Difference]: With dead ends: 117 [2021-08-27 07:20:07,973 INFO L226 Difference]: Without dead ends: 113 [2021-08-27 07:20:07,973 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 511 ImplicationChecksByTransitivity, 3884.7ms TimeCoverageRelationStatistics Valid=361, Invalid=3929, Unknown=0, NotChecked=0, Total=4290 [2021-08-27 07:20:07,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-08-27 07:20:07,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 107. [2021-08-27 07:20:07,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 87 states have (on average 1.1839080459770115) internal successors, (103), 96 states have internal predecessors, (103), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-08-27 07:20:07,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 115 transitions. [2021-08-27 07:20:07,977 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 115 transitions. Word has length 62 [2021-08-27 07:20:07,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:20:07,977 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 115 transitions. [2021-08-27 07:20:07,977 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 42 states have (on average 2.3095238095238093) internal successors, (97), 36 states have internal predecessors, (97), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-08-27 07:20:07,978 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 115 transitions. [2021-08-27 07:20:07,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-08-27 07:20:07,978 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:20:07,978 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:20:08,007 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-08-27 07:20:08,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:20:08,193 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting mainErr2ASSERT_VIOLATIONMEMORY_LEAK === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:20:08,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:20:08,193 INFO L82 PathProgramCache]: Analyzing trace with hash 17828144, now seen corresponding path program 1 times [2021-08-27 07:20:08,193 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:20:08,193 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593262210] [2021-08-27 07:20:08,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:20:08,193 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:20:08,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:08,253 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:20:08,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:08,268 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:20:08,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:08,285 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-08-27 07:20:08,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:08,292 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-08-27 07:20:08,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:08,325 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-08-27 07:20:08,326 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:20:08,326 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593262210] [2021-08-27 07:20:08,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [593262210] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:20:08,326 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:20:08,326 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-08-27 07:20:08,326 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803879792] [2021-08-27 07:20:08,328 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-08-27 07:20:08,328 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:20:08,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-08-27 07:20:08,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-08-27 07:20:08,329 INFO L87 Difference]: Start difference. First operand 107 states and 115 transitions. Second operand has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 6 states have internal predecessors, (50), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-08-27 07:20:08,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:20:08,694 INFO L93 Difference]: Finished difference Result 107 states and 115 transitions. [2021-08-27 07:20:08,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-08-27 07:20:08,695 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 6 states have internal predecessors, (50), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 67 [2021-08-27 07:20:08,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:20:08,695 INFO L225 Difference]: With dead ends: 107 [2021-08-27 07:20:08,696 INFO L226 Difference]: Without dead ends: 107 [2021-08-27 07:20:08,696 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 229.4ms TimeCoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2021-08-27 07:20:08,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-08-27 07:20:08,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 105. [2021-08-27 07:20:08,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 86 states have (on average 1.1744186046511629) internal successors, (101), 94 states have internal predecessors, (101), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-08-27 07:20:08,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 113 transitions. [2021-08-27 07:20:08,699 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 113 transitions. Word has length 67 [2021-08-27 07:20:08,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:20:08,699 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 113 transitions. [2021-08-27 07:20:08,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 6 states have internal predecessors, (50), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-08-27 07:20:08,700 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 113 transitions. [2021-08-27 07:20:08,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-08-27 07:20:08,700 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:20:08,700 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:20:08,701 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-08-27 07:20:08,701 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting mainErr3ENSURES_VIOLATIONMEMORY_LEAK === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:20:08,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:20:08,701 INFO L82 PathProgramCache]: Analyzing trace with hash 17828209, now seen corresponding path program 1 times [2021-08-27 07:20:08,701 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:20:08,702 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477491305] [2021-08-27 07:20:08,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:20:08,702 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:20:08,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:08,938 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:20:08,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:08,958 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:20:08,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:09,400 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-08-27 07:20:09,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:09,969 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-08-27 07:20:09,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:10,155 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-27 07:20:10,156 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:20:10,156 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477491305] [2021-08-27 07:20:10,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1477491305] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:20:10,156 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [833869694] [2021-08-27 07:20:10,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:20:10,156 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-08-27 07:20:10,156 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-08-27 07:20:10,157 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-08-27 07:20:10,157 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-08-27 07:20:11,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:11,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 105 conjunts are in the unsatisfiable core [2021-08-27 07:20:11,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-08-27 07:20:11,244 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 9 treesize of output 7 [2021-08-27 07:20:11,477 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 13 treesize of output 9 [2021-08-27 07:20:11,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:20:11,544 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 23 treesize of output 22 [2021-08-27 07:20:11,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-08-27 07:20:11,658 INFO L354 Elim1Store]: treesize reduction 68, result has 21.8 percent of original size [2021-08-27 07:20:11,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 75 treesize of output 56 [2021-08-27 07:20:16,004 INFO L354 Elim1Store]: treesize reduction 254, result has 13.0 percent of original size [2021-08-27 07:20:16,005 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 185 treesize of output 122 [2021-08-27 07:20:16,011 INFO L354 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2021-08-27 07:20:16,011 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 146 treesize of output 131 [2021-08-27 07:20:16,934 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 7 treesize of output 3 [2021-08-27 07:20:17,095 INFO L354 Elim1Store]: treesize reduction 85, result has 8.6 percent of original size [2021-08-27 07:20:17,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 127 treesize of output 74 [2021-08-27 07:20:17,488 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-27 07:20:17,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [833869694] provided 0 perfect and 1 imperfect interpolant sequences [2021-08-27 07:20:17,488 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-08-27 07:20:17,488 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 59 [2021-08-27 07:20:17,488 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050193162] [2021-08-27 07:20:17,489 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-08-27 07:20:17,489 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:20:17,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-08-27 07:20:17,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=3350, Unknown=1, NotChecked=0, Total=3540 [2021-08-27 07:20:17,490 INFO L87 Difference]: Start difference. First operand 105 states and 113 transitions. Second operand has 60 states, 57 states have (on average 1.9649122807017543) internal successors, (112), 53 states have internal predecessors, (112), 7 states have call successors, (9), 7 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-08-27 07:20:28,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:20:28,279 INFO L93 Difference]: Finished difference Result 119 states and 126 transitions. [2021-08-27 07:20:28,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-08-27 07:20:28,280 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 57 states have (on average 1.9649122807017543) internal successors, (112), 53 states have internal predecessors, (112), 7 states have call successors, (9), 7 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 67 [2021-08-27 07:20:28,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:20:28,282 INFO L225 Difference]: With dead ends: 119 [2021-08-27 07:20:28,282 INFO L226 Difference]: Without dead ends: 116 [2021-08-27 07:20:28,283 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1358 ImplicationChecksByTransitivity, 10809.1ms TimeCoverageRelationStatistics Valid=430, Invalid=6047, Unknown=3, NotChecked=0, Total=6480 [2021-08-27 07:20:28,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-08-27 07:20:28,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 99. [2021-08-27 07:20:28,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 80 states have (on average 1.125) internal successors, (90), 87 states have internal predecessors, (90), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-08-27 07:20:28,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2021-08-27 07:20:28,288 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 67 [2021-08-27 07:20:28,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:20:28,288 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2021-08-27 07:20:28,288 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 57 states have (on average 1.9649122807017543) internal successors, (112), 53 states have internal predecessors, (112), 7 states have call successors, (9), 7 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-08-27 07:20:28,288 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2021-08-27 07:20:28,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-08-27 07:20:28,289 INFO L504 BasicCegarLoop]: Found error trace [2021-08-27 07:20:28,289 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-27 07:20:28,310 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-08-27 07:20:28,492 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-08-27 07:20:28,493 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting dll_remove_lastErr2REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-08-27 07:20:28,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-27 07:20:28,493 INFO L82 PathProgramCache]: Analyzing trace with hash 556285180, now seen corresponding path program 1 times [2021-08-27 07:20:28,493 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-27 07:20:28,493 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1205775879] [2021-08-27 07:20:28,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-27 07:20:28,500 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-08-27 07:20:28,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:28,565 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-08-27 07:20:28,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:28,581 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-08-27 07:20:28,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:28,603 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-08-27 07:20:28,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:28,611 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-08-27 07:20:28,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-27 07:20:28,616 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-08-27 07:20:28,617 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-27 07:20:28,617 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1205775879] [2021-08-27 07:20:28,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1205775879] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-27 07:20:28,617 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-27 07:20:28,617 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-08-27 07:20:28,618 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534218974] [2021-08-27 07:20:28,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-08-27 07:20:28,618 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-27 07:20:28,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-08-27 07:20:28,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-08-27 07:20:28,619 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand has 9 states, 9 states have (on average 5.222222222222222) internal successors, (47), 6 states have internal predecessors, (47), 5 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-08-27 07:20:28,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-08-27 07:20:28,776 INFO L93 Difference]: Finished difference Result 64 states and 63 transitions. [2021-08-27 07:20:28,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-08-27 07:20:28,776 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.222222222222222) internal successors, (47), 6 states have internal predecessors, (47), 5 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 68 [2021-08-27 07:20:28,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-08-27 07:20:28,777 INFO L225 Difference]: With dead ends: 64 [2021-08-27 07:20:28,777 INFO L226 Difference]: Without dead ends: 0 [2021-08-27 07:20:28,777 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 93.7ms TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2021-08-27 07:20:28,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-08-27 07:20:28,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-08-27 07:20:28,778 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) [2021-08-27 07:20:28,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-08-27 07:20:28,778 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 68 [2021-08-27 07:20:28,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-08-27 07:20:28,778 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-08-27 07:20:28,778 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.222222222222222) internal successors, (47), 6 states have internal predecessors, (47), 5 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-08-27 07:20:28,778 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-08-27 07:20:28,779 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-08-27 07:20:28,788 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr0REQUIRES_VIOLATION [2021-08-27 07:20:28,789 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr1REQUIRES_VIOLATION [2021-08-27 07:20:28,789 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr2REQUIRES_VIOLATION [2021-08-27 07:20:28,789 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr3REQUIRES_VIOLATION [2021-08-27 07:20:28,789 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr4REQUIRES_VIOLATION [2021-08-27 07:20:28,789 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr5REQUIRES_VIOLATION [2021-08-27 07:20:28,790 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr0REQUIRES_VIOLATION [2021-08-27 07:20:28,790 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr1REQUIRES_VIOLATION [2021-08-27 07:20:28,790 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr2REQUIRES_VIOLATION [2021-08-27 07:20:28,790 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr3REQUIRES_VIOLATION [2021-08-27 07:20:28,790 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr4REQUIRES_VIOLATION [2021-08-27 07:20:28,790 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr5REQUIRES_VIOLATION [2021-08-27 07:20:28,790 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr6ASSERT_VIOLATIONMEMORY_FREE [2021-08-27 07:20:28,791 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr7ASSERT_VIOLATIONMEMORY_FREE [2021-08-27 07:20:28,791 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr8ASSERT_VIOLATIONMEMORY_FREE [2021-08-27 07:20:28,791 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr9REQUIRES_VIOLATION [2021-08-27 07:20:28,792 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr10REQUIRES_VIOLATION [2021-08-27 07:20:28,792 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr11REQUIRES_VIOLATION [2021-08-27 07:20:28,792 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr12REQUIRES_VIOLATION [2021-08-27 07:20:28,792 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr13REQUIRES_VIOLATION [2021-08-27 07:20:28,792 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr14REQUIRES_VIOLATION [2021-08-27 07:20:28,792 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr15REQUIRES_VIOLATION [2021-08-27 07:20:28,792 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr16REQUIRES_VIOLATION [2021-08-27 07:20:28,792 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr17REQUIRES_VIOLATION [2021-08-27 07:20:28,793 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr18REQUIRES_VIOLATION [2021-08-27 07:20:28,793 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr19ASSERT_VIOLATIONMEMORY_FREE [2021-08-27 07:20:28,793 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr20ASSERT_VIOLATIONMEMORY_FREE [2021-08-27 07:20:28,793 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr21ASSERT_VIOLATIONMEMORY_FREE [2021-08-27 07:20:28,793 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr0REQUIRES_VIOLATION [2021-08-27 07:20:28,793 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr1REQUIRES_VIOLATION [2021-08-27 07:20:28,794 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr2ASSERT_VIOLATIONMEMORY_LEAK [2021-08-27 07:20:28,794 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr3ENSURES_VIOLATIONMEMORY_LEAK [2021-08-27 07:20:28,794 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr0REQUIRES_VIOLATION [2021-08-27 07:20:28,794 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr1REQUIRES_VIOLATION [2021-08-27 07:20:28,794 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr2REQUIRES_VIOLATION [2021-08-27 07:20:28,794 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr3REQUIRES_VIOLATION [2021-08-27 07:20:28,794 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr4REQUIRES_VIOLATION [2021-08-27 07:20:28,794 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr5REQUIRES_VIOLATION [2021-08-27 07:20:28,795 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr6REQUIRES_VIOLATION [2021-08-27 07:20:28,795 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr7REQUIRES_VIOLATION [2021-08-27 07:20:28,795 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-08-27 07:20:28,800 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-08-27 07:20:28,803 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.08 07:20:28 BoogieIcfgContainer [2021-08-27 07:20:28,803 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-27 07:20:28,804 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-08-27 07:20:28,804 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-08-27 07:20:28,804 INFO L275 PluginConnector]: Witness Printer initialized [2021-08-27 07:20:28,805 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.08 07:16:45" (3/4) ... [2021-08-27 07:20:28,807 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-08-27 07:20:28,813 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure reach_error [2021-08-27 07:20:28,814 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure dll_remove_last [2021-08-27 07:20:28,814 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2021-08-27 07:20:28,814 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure myexit [2021-08-27 07:20:28,814 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure dll_create [2021-08-27 07:20:28,814 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_32 [2021-08-27 07:20:28,814 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_64 [2021-08-27 07:20:28,814 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2021-08-27 07:20:28,815 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure node_create [2021-08-27 07:20:28,821 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 15 nodes and edges [2021-08-27 07:20:28,822 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2021-08-27 07:20:28,822 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2021-08-27 07:20:28,822 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-08-27 07:20:28,865 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-08-27 07:20:28,865 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-08-27 07:20:28,867 INFO L168 Benchmark]: Toolchain (without parser) took 224687.89 ms. Allocated memory was 48.2 MB in the beginning and 413.1 MB in the end (delta: 364.9 MB). Free memory was 22.4 MB in the beginning and 266.5 MB in the end (delta: -244.1 MB). Peak memory consumption was 120.6 MB. Max. memory is 16.1 GB. [2021-08-27 07:20:28,867 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 48.2 MB. Free memory was 30.4 MB in the beginning and 30.3 MB in the end (delta: 40.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-08-27 07:20:28,867 INFO L168 Benchmark]: CACSL2BoogieTranslator took 411.28 ms. Allocated memory was 48.2 MB in the beginning and 60.8 MB in the end (delta: 12.6 MB). Free memory was 22.2 MB in the beginning and 37.6 MB in the end (delta: -15.4 MB). Peak memory consumption was 3.7 MB. Max. memory is 16.1 GB. [2021-08-27 07:20:28,868 INFO L168 Benchmark]: Boogie Preprocessor took 61.85 ms. Allocated memory is still 60.8 MB. Free memory was 37.6 MB in the beginning and 34.8 MB in the end (delta: 2.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-08-27 07:20:28,868 INFO L168 Benchmark]: RCFGBuilder took 706.18 ms. Allocated memory was 60.8 MB in the beginning and 73.4 MB in the end (delta: 12.6 MB). Free memory was 34.8 MB in the beginning and 52.6 MB in the end (delta: -17.8 MB). Peak memory consumption was 16.0 MB. Max. memory is 16.1 GB. [2021-08-27 07:20:28,868 INFO L168 Benchmark]: TraceAbstraction took 223442.16 ms. Allocated memory was 73.4 MB in the beginning and 413.1 MB in the end (delta: 339.7 MB). Free memory was 51.9 MB in the beginning and 270.7 MB in the end (delta: -218.8 MB). Peak memory consumption was 120.9 MB. Max. memory is 16.1 GB. [2021-08-27 07:20:28,869 INFO L168 Benchmark]: Witness Printer took 61.46 ms. Allocated memory is still 413.1 MB. Free memory was 270.7 MB in the beginning and 266.5 MB in the end (delta: 4.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-08-27 07:20:28,871 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 48.2 MB. Free memory was 30.4 MB in the beginning and 30.3 MB in the end (delta: 40.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 411.28 ms. Allocated memory was 48.2 MB in the beginning and 60.8 MB in the end (delta: 12.6 MB). Free memory was 22.2 MB in the beginning and 37.6 MB in the end (delta: -15.4 MB). Peak memory consumption was 3.7 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 61.85 ms. Allocated memory is still 60.8 MB. Free memory was 37.6 MB in the beginning and 34.8 MB in the end (delta: 2.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 706.18 ms. Allocated memory was 60.8 MB in the beginning and 73.4 MB in the end (delta: 12.6 MB). Free memory was 34.8 MB in the beginning and 52.6 MB in the end (delta: -17.8 MB). Peak memory consumption was 16.0 MB. Max. memory is 16.1 GB. * TraceAbstraction took 223442.16 ms. Allocated memory was 73.4 MB in the beginning and 413.1 MB in the end (delta: 339.7 MB). Free memory was 51.9 MB in the beginning and 270.7 MB in the end (delta: -218.8 MB). Peak memory consumption was 120.9 MB. Max. memory is 16.1 GB. * Witness Printer took 61.46 ms. Allocated memory is still 413.1 MB. Free memory was 270.7 MB in the beginning and 266.5 MB in the end (delta: 4.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 580]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 580]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 581]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 581]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 582]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 582]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 604]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 604]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 604]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 604]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 605]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 605]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 605]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 605]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 605]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 606]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 606]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 609]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 609]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 610]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 610]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 612]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 612]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 614]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 614]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 615]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 615]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 615]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 626]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 626]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 630]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 618]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 592]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 592]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 593]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 593]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 594]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 594]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 596]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 596]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 10 procedures, 113 locations, 40 error locations. Started 1 CEGAR loops. OverallTime: 223392.4ms, OverallIterations: 40, TraceHistogramMax: 3, EmptinessCheckTime: 42.6ms, AutomataDifference: 164403.3ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 10.1ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 1623 SDtfs, 6815 SDslu, 7985 SDs, 0 SdLazy, 29178 SolverSat, 1151 SolverUnsat, 62 SolverUnknown, 0 SolverNotchecked, 47725.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2143 GetRequests, 992 SyntacticMatches, 18 SemanticMatches, 1133 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 10120 ImplicationChecksByTransitivity, 133403.3ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=156occurred in iteration=17, InterpolantAutomatonStates: 663, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 219.0ms AutomataMinimizationTime, 40 MinimizatonAttempts, 468 StatesRemovedByMinimization, 29 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 384.7ms SsaConstructionTime, 1300.9ms SatisfiabilityAnalysisTime, 40198.5ms InterpolantComputationTime, 2654 NumberOfCodeBlocks, 2640 NumberOfCodeBlocksAsserted, 66 NumberOfCheckSat, 2590 ConstructedInterpolants, 199 QuantifiedInterpolants, 34610 SizeOfPredicates, 242 NumberOfNonLiveVariables, 6685 ConjunctsInSsa, 804 ConjunctsInUnsatCore, 64 InterpolantComputations, 19 PerfectInterpolantSequences, 428/779 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 40 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2021-08-27 07:20:29,093 WARN L435 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forcibly destroying the process [2021-08-27 07:20:29,224 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 137 Received shutdown request...