./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.3.1.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/config/AutomizerReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.3.1.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d0cee5b1964cd71f7406ad577c9568bfea84778de80728dfc08113baa4a027fc --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 08:31:50,578 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 08:31:50,582 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 08:31:50,661 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 08:31:50,662 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 08:31:50,668 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 08:31:50,670 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 08:31:50,675 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 08:31:50,678 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 08:31:50,685 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 08:31:50,686 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 08:31:50,688 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 08:31:50,689 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 08:31:50,692 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 08:31:50,694 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 08:31:50,700 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 08:31:50,702 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 08:31:50,704 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 08:31:50,706 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 08:31:50,716 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 08:31:50,718 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 08:31:50,720 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 08:31:50,724 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 08:31:50,725 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 08:31:50,730 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 08:31:50,730 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 08:31:50,731 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 08:31:50,733 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 08:31:50,734 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 08:31:50,736 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 08:31:50,736 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 08:31:50,738 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 08:31:50,740 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 08:31:50,742 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 08:31:50,743 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 08:31:50,744 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 08:31:50,745 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 08:31:50,745 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 08:31:50,745 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 08:31:50,746 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 08:31:50,747 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 08:31:50,748 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-07 08:31:50,801 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 08:31:50,801 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 08:31:50,802 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-07 08:31:50,802 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-07 08:31:50,804 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-07 08:31:50,804 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-07 08:31:50,804 INFO L138 SettingsManager]: * Use SBE=true [2021-11-07 08:31:50,805 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 08:31:50,805 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 08:31:50,805 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 08:31:50,807 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 08:31:50,807 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 08:31:50,807 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 08:31:50,808 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 08:31:50,808 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 08:31:50,808 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 08:31:50,808 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 08:31:50,809 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 08:31:50,809 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 08:31:50,809 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 08:31:50,809 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 08:31:50,810 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 08:31:50,810 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 08:31:50,810 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 08:31:50,811 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 08:31:50,811 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 08:31:50,811 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-07 08:31:50,811 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 08:31:50,812 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-07 08:31:50,814 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-07 08:31:50,814 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 08:31:50,814 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 08:31:50,815 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d0cee5b1964cd71f7406ad577c9568bfea84778de80728dfc08113baa4a027fc [2021-11-07 08:31:51,208 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 08:31:51,243 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 08:31:51,246 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 08:31:51,248 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 08:31:51,248 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 08:31:51,250 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/../../sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.3.1.ufo.UNBOUNDED.pals.c [2021-11-07 08:31:51,331 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/data/7dca073a9/cb432eb51d264cd5b1f17311249afd53/FLAG9ad90b98f [2021-11-07 08:31:52,033 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 08:31:52,034 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.3.1.ufo.UNBOUNDED.pals.c [2021-11-07 08:31:52,047 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/data/7dca073a9/cb432eb51d264cd5b1f17311249afd53/FLAG9ad90b98f [2021-11-07 08:31:52,317 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/data/7dca073a9/cb432eb51d264cd5b1f17311249afd53 [2021-11-07 08:31:52,320 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 08:31:52,322 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 08:31:52,327 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 08:31:52,328 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 08:31:52,336 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 08:31:52,338 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 08:31:52" (1/1) ... [2021-11-07 08:31:52,341 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3f894959 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:31:52, skipping insertion in model container [2021-11-07 08:31:52,341 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 08:31:52" (1/1) ... [2021-11-07 08:31:52,350 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 08:31:52,383 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 08:31:52,658 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.3.1.ufo.UNBOUNDED.pals.c[6940,6953] [2021-11-07 08:31:52,661 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 08:31:52,680 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 08:31:52,729 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/sv-benchmarks/c/seq-mthreaded/pals_lcr-var-start-time.3.1.ufo.UNBOUNDED.pals.c[6940,6953] [2021-11-07 08:31:52,729 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 08:31:52,745 INFO L208 MainTranslator]: Completed translation [2021-11-07 08:31:52,746 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:31:52 WrapperNode [2021-11-07 08:31:52,746 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 08:31:52,747 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 08:31:52,747 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 08:31:52,748 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 08:31:52,758 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:31:52" (1/1) ... [2021-11-07 08:31:52,769 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:31:52" (1/1) ... [2021-11-07 08:31:52,819 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 08:31:52,820 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 08:31:52,820 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 08:31:52,820 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 08:31:52,830 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:31:52" (1/1) ... [2021-11-07 08:31:52,831 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:31:52" (1/1) ... [2021-11-07 08:31:52,834 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:31:52" (1/1) ... [2021-11-07 08:31:52,835 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:31:52" (1/1) ... [2021-11-07 08:31:52,842 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:31:52" (1/1) ... [2021-11-07 08:31:52,849 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:31:52" (1/1) ... [2021-11-07 08:31:52,852 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:31:52" (1/1) ... [2021-11-07 08:31:52,856 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 08:31:52,873 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 08:31:52,873 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 08:31:52,873 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 08:31:52,874 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:31:52" (1/1) ... [2021-11-07 08:31:52,887 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 08:31:52,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:31:52,926 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 08:31:52,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 08:31:52,974 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 08:31:52,974 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 08:31:52,974 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 08:31:52,974 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 08:31:53,655 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 08:31:53,656 INFO L299 CfgBuilder]: Removed 19 assume(true) statements. [2021-11-07 08:31:53,658 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 08:31:53 BoogieIcfgContainer [2021-11-07 08:31:53,659 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 08:31:53,661 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 08:31:53,672 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 08:31:53,676 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 08:31:53,676 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 08:31:52" (1/3) ... [2021-11-07 08:31:53,677 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@dcd05d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 08:31:53, skipping insertion in model container [2021-11-07 08:31:53,677 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 08:31:52" (2/3) ... [2021-11-07 08:31:53,678 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@dcd05d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 08:31:53, skipping insertion in model container [2021-11-07 08:31:53,678 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 08:31:53" (3/3) ... [2021-11-07 08:31:53,681 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr-var-start-time.3.1.ufo.UNBOUNDED.pals.c [2021-11-07 08:31:53,688 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 08:31:53,688 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 08:31:53,781 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 08:31:53,791 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=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 08:31:53,791 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 08:31:53,818 INFO L276 IsEmpty]: Start isEmpty. Operand has 80 states, 78 states have (on average 1.6794871794871795) internal successors, (131), 79 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:53,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-07 08:31:53,830 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:31:53,831 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:31:53,833 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:31:53,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:31:53,844 INFO L85 PathProgramCache]: Analyzing trace with hash -1546658209, now seen corresponding path program 1 times [2021-11-07 08:31:53,866 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:31:53,866 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [950001251] [2021-11-07 08:31:53,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:31:53,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:31:54,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:31:54,189 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:31:54,189 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:31:54,190 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [950001251] [2021-11-07 08:31:54,190 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [950001251] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:31:54,191 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:31:54,191 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 08:31:54,193 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123614092] [2021-11-07 08:31:54,199 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 08:31:54,199 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:31:54,214 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 08:31:54,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 08:31:54,219 INFO L87 Difference]: Start difference. First operand has 80 states, 78 states have (on average 1.6794871794871795) internal successors, (131), 79 states have internal predecessors, (131), 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) Second operand has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:54,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:31:54,321 INFO L93 Difference]: Finished difference Result 137 states and 223 transitions. [2021-11-07 08:31:54,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 08:31:54,323 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 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) Word has length 26 [2021-11-07 08:31:54,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:31:54,335 INFO L225 Difference]: With dead ends: 137 [2021-11-07 08:31:54,335 INFO L226 Difference]: Without dead ends: 76 [2021-11-07 08:31:54,339 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-07 08:31:54,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-07 08:31:54,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2021-11-07 08:31:54,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 75 states have (on average 1.4266666666666667) internal successors, (107), 75 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:54,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 107 transitions. [2021-11-07 08:31:54,385 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 107 transitions. Word has length 26 [2021-11-07 08:31:54,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:31:54,386 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 107 transitions. [2021-11-07 08:31:54,386 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:54,387 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 107 transitions. [2021-11-07 08:31:54,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-07 08:31:54,389 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:31:54,389 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:31:54,389 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 08:31:54,390 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:31:54,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:31:54,391 INFO L85 PathProgramCache]: Analyzing trace with hash 1146437097, now seen corresponding path program 1 times [2021-11-07 08:31:54,391 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:31:54,391 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36376781] [2021-11-07 08:31:54,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:31:54,392 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:31:54,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:31:54,530 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:31:54,531 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:31:54,531 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36376781] [2021-11-07 08:31:54,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [36376781] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:31:54,532 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:31:54,532 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 08:31:54,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556569546] [2021-11-07 08:31:54,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 08:31:54,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:31:54,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 08:31:54,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 08:31:54,536 INFO L87 Difference]: Start difference. First operand 76 states and 107 transitions. Second operand has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:54,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:31:54,591 INFO L93 Difference]: Finished difference Result 170 states and 255 transitions. [2021-11-07 08:31:54,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 08:31:54,599 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 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) Word has length 42 [2021-11-07 08:31:54,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:31:54,601 INFO L225 Difference]: With dead ends: 170 [2021-11-07 08:31:54,601 INFO L226 Difference]: Without dead ends: 117 [2021-11-07 08:31:54,624 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 08:31:54,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-11-07 08:31:54,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2021-11-07 08:31:54,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 114 states have (on average 1.4824561403508771) internal successors, (169), 114 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:54,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 169 transitions. [2021-11-07 08:31:54,663 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 169 transitions. Word has length 42 [2021-11-07 08:31:54,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:31:54,664 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 169 transitions. [2021-11-07 08:31:54,664 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.0) internal successors, (42), 3 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:54,664 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 169 transitions. [2021-11-07 08:31:54,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-07 08:31:54,667 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:31:54,668 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:31:54,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 08:31:54,670 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:31:54,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:31:54,678 INFO L85 PathProgramCache]: Analyzing trace with hash 983172312, now seen corresponding path program 1 times [2021-11-07 08:31:54,678 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:31:54,679 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492041415] [2021-11-07 08:31:54,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:31:54,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:31:54,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:31:54,852 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:31:54,853 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:31:54,853 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492041415] [2021-11-07 08:31:54,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1492041415] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:31:54,854 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:31:54,854 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 08:31:54,854 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428769452] [2021-11-07 08:31:54,855 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 08:31:54,856 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:31:54,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 08:31:54,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 08:31:54,862 INFO L87 Difference]: Start difference. First operand 115 states and 169 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:54,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:31:54,910 INFO L93 Difference]: Finished difference Result 275 states and 421 transitions. [2021-11-07 08:31:54,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 08:31:54,911 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 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) Word has length 43 [2021-11-07 08:31:54,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:31:54,914 INFO L225 Difference]: With dead ends: 275 [2021-11-07 08:31:54,914 INFO L226 Difference]: Without dead ends: 183 [2021-11-07 08:31:54,915 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 08:31:54,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-11-07 08:31:54,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 181. [2021-11-07 08:31:54,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 180 states have (on average 1.511111111111111) internal successors, (272), 180 states have internal predecessors, (272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:54,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 272 transitions. [2021-11-07 08:31:54,940 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 272 transitions. Word has length 43 [2021-11-07 08:31:54,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:31:54,940 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 272 transitions. [2021-11-07 08:31:54,941 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:54,941 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 272 transitions. [2021-11-07 08:31:54,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-07 08:31:54,943 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:31:54,943 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:31:54,943 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 08:31:54,943 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:31:54,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:31:54,944 INFO L85 PathProgramCache]: Analyzing trace with hash -14404519, now seen corresponding path program 1 times [2021-11-07 08:31:54,944 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:31:54,945 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236614835] [2021-11-07 08:31:54,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:31:54,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:31:55,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:31:55,121 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:31:55,121 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:31:55,122 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236614835] [2021-11-07 08:31:55,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1236614835] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:31:55,123 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:31:55,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 08:31:55,123 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104051340] [2021-11-07 08:31:55,124 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 08:31:55,124 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:31:55,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 08:31:55,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 08:31:55,126 INFO L87 Difference]: Start difference. First operand 181 states and 272 transitions. Second operand has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:55,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:31:55,280 INFO L93 Difference]: Finished difference Result 813 states and 1268 transitions. [2021-11-07 08:31:55,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 08:31:55,286 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 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) Word has length 44 [2021-11-07 08:31:55,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:31:55,293 INFO L225 Difference]: With dead ends: 813 [2021-11-07 08:31:55,293 INFO L226 Difference]: Without dead ends: 655 [2021-11-07 08:31:55,295 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-07 08:31:55,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 655 states. [2021-11-07 08:31:55,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 655 to 337. [2021-11-07 08:31:55,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 336 states have (on average 1.5238095238095237) internal successors, (512), 336 states have internal predecessors, (512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:55,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 512 transitions. [2021-11-07 08:31:55,375 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 512 transitions. Word has length 44 [2021-11-07 08:31:55,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:31:55,375 INFO L470 AbstractCegarLoop]: Abstraction has 337 states and 512 transitions. [2021-11-07 08:31:55,376 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:55,376 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 512 transitions. [2021-11-07 08:31:55,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-07 08:31:55,378 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:31:55,378 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:31:55,379 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 08:31:55,379 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:31:55,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:31:55,391 INFO L85 PathProgramCache]: Analyzing trace with hash -829863502, now seen corresponding path program 1 times [2021-11-07 08:31:55,391 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:31:55,392 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011113214] [2021-11-07 08:31:55,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:31:55,392 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:31:55,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:31:55,632 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:31:55,634 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:31:55,635 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011113214] [2021-11-07 08:31:55,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2011113214] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:31:55,635 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:31:55,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 08:31:55,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090023829] [2021-11-07 08:31:55,638 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 08:31:55,638 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:31:55,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 08:31:55,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-07 08:31:55,640 INFO L87 Difference]: Start difference. First operand 337 states and 512 transitions. Second operand has 5 states, 5 states have (on average 9.0) internal successors, (45), 5 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:55,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:31:55,810 INFO L93 Difference]: Finished difference Result 1183 states and 1815 transitions. [2021-11-07 08:31:55,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 08:31:55,811 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.0) internal successors, (45), 5 states have internal predecessors, (45), 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) Word has length 45 [2021-11-07 08:31:55,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:31:55,819 INFO L225 Difference]: With dead ends: 1183 [2021-11-07 08:31:55,819 INFO L226 Difference]: Without dead ends: 869 [2021-11-07 08:31:55,825 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-07 08:31:55,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 869 states. [2021-11-07 08:31:55,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 869 to 865. [2021-11-07 08:31:55,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 865 states, 864 states have (on average 1.5231481481481481) internal successors, (1316), 864 states have internal predecessors, (1316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:55,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 865 states to 865 states and 1316 transitions. [2021-11-07 08:31:55,910 INFO L78 Accepts]: Start accepts. Automaton has 865 states and 1316 transitions. Word has length 45 [2021-11-07 08:31:55,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:31:55,912 INFO L470 AbstractCegarLoop]: Abstraction has 865 states and 1316 transitions. [2021-11-07 08:31:55,913 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.0) internal successors, (45), 5 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:55,914 INFO L276 IsEmpty]: Start isEmpty. Operand 865 states and 1316 transitions. [2021-11-07 08:31:55,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-07 08:31:55,924 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:31:55,924 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:31:55,924 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-07 08:31:55,925 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:31:55,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:31:55,927 INFO L85 PathProgramCache]: Analyzing trace with hash -1485202410, now seen corresponding path program 1 times [2021-11-07 08:31:55,927 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:31:55,928 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417022003] [2021-11-07 08:31:55,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:31:55,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:31:55,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:31:56,063 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:31:56,063 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:31:56,064 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417022003] [2021-11-07 08:31:56,064 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [417022003] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:31:56,064 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:31:56,064 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 08:31:56,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265629129] [2021-11-07 08:31:56,065 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 08:31:56,066 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:31:56,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 08:31:56,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 08:31:56,067 INFO L87 Difference]: Start difference. First operand 865 states and 1316 transitions. Second operand has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 3 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:56,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:31:56,148 INFO L93 Difference]: Finished difference Result 2237 states and 3390 transitions. [2021-11-07 08:31:56,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 08:31:56,149 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 3 states have internal predecessors, (46), 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) Word has length 46 [2021-11-07 08:31:56,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:31:56,172 INFO L225 Difference]: With dead ends: 2237 [2021-11-07 08:31:56,172 INFO L226 Difference]: Without dead ends: 1395 [2021-11-07 08:31:56,174 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 08:31:56,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1395 states. [2021-11-07 08:31:56,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1395 to 1393. [2021-11-07 08:31:56,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1393 states, 1392 states have (on average 1.4885057471264367) internal successors, (2072), 1392 states have internal predecessors, (2072), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:56,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1393 states to 1393 states and 2072 transitions. [2021-11-07 08:31:56,259 INFO L78 Accepts]: Start accepts. Automaton has 1393 states and 2072 transitions. Word has length 46 [2021-11-07 08:31:56,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:31:56,261 INFO L470 AbstractCegarLoop]: Abstraction has 1393 states and 2072 transitions. [2021-11-07 08:31:56,262 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.333333333333334) internal successors, (46), 3 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:56,262 INFO L276 IsEmpty]: Start isEmpty. Operand 1393 states and 2072 transitions. [2021-11-07 08:31:56,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-07 08:31:56,265 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:31:56,265 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:31:56,265 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-07 08:31:56,266 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:31:56,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:31:56,266 INFO L85 PathProgramCache]: Analyzing trace with hash 1374629896, now seen corresponding path program 1 times [2021-11-07 08:31:56,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:31:56,272 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1707527180] [2021-11-07 08:31:56,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:31:56,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:31:56,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:31:56,414 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:31:56,414 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:31:56,415 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1707527180] [2021-11-07 08:31:56,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1707527180] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:31:56,415 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:31:56,416 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-07 08:31:56,416 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178812637] [2021-11-07 08:31:56,417 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 08:31:56,417 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:31:56,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 08:31:56,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-07 08:31:56,418 INFO L87 Difference]: Start difference. First operand 1393 states and 2072 transitions. Second operand has 8 states, 8 states have (on average 5.75) internal successors, (46), 8 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:56,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:31:56,787 INFO L93 Difference]: Finished difference Result 2955 states and 4313 transitions. [2021-11-07 08:31:56,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 08:31:56,788 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.75) internal successors, (46), 8 states have internal predecessors, (46), 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) Word has length 46 [2021-11-07 08:31:56,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:31:56,809 INFO L225 Difference]: With dead ends: 2955 [2021-11-07 08:31:56,810 INFO L226 Difference]: Without dead ends: 2953 [2021-11-07 08:31:56,812 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2021-11-07 08:31:56,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2953 states. [2021-11-07 08:31:56,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2953 to 1537. [2021-11-07 08:31:56,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1537 states, 1536 states have (on average 1.4427083333333333) internal successors, (2216), 1536 states have internal predecessors, (2216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:56,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1537 states to 1537 states and 2216 transitions. [2021-11-07 08:31:56,964 INFO L78 Accepts]: Start accepts. Automaton has 1537 states and 2216 transitions. Word has length 46 [2021-11-07 08:31:56,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:31:56,965 INFO L470 AbstractCegarLoop]: Abstraction has 1537 states and 2216 transitions. [2021-11-07 08:31:56,965 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.75) internal successors, (46), 8 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:56,965 INFO L276 IsEmpty]: Start isEmpty. Operand 1537 states and 2216 transitions. [2021-11-07 08:31:56,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-07 08:31:56,967 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:31:56,967 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:31:56,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-07 08:31:56,968 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:31:56,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:31:56,969 INFO L85 PathProgramCache]: Analyzing trace with hash -283567685, now seen corresponding path program 1 times [2021-11-07 08:31:56,969 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:31:56,970 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118623969] [2021-11-07 08:31:56,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:31:56,971 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:31:56,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:31:57,062 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:31:57,063 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:31:57,063 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118623969] [2021-11-07 08:31:57,063 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2118623969] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:31:57,064 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:31:57,064 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 08:31:57,064 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303636047] [2021-11-07 08:31:57,065 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 08:31:57,065 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:31:57,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 08:31:57,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 08:31:57,066 INFO L87 Difference]: Start difference. First operand 1537 states and 2216 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:57,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:31:57,254 INFO L93 Difference]: Finished difference Result 3671 states and 5308 transitions. [2021-11-07 08:31:57,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 08:31:57,255 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 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) Word has length 47 [2021-11-07 08:31:57,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:31:57,272 INFO L225 Difference]: With dead ends: 3671 [2021-11-07 08:31:57,272 INFO L226 Difference]: Without dead ends: 2157 [2021-11-07 08:31:57,275 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 08:31:57,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2157 states. [2021-11-07 08:31:57,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2157 to 2135. [2021-11-07 08:31:57,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2135 states, 2134 states have (on average 1.4311152764761013) internal successors, (3054), 2134 states have internal predecessors, (3054), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:57,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2135 states to 2135 states and 3054 transitions. [2021-11-07 08:31:57,493 INFO L78 Accepts]: Start accepts. Automaton has 2135 states and 3054 transitions. Word has length 47 [2021-11-07 08:31:57,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:31:57,494 INFO L470 AbstractCegarLoop]: Abstraction has 2135 states and 3054 transitions. [2021-11-07 08:31:57,495 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:31:57,495 INFO L276 IsEmpty]: Start isEmpty. Operand 2135 states and 3054 transitions. [2021-11-07 08:31:57,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 08:31:57,499 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:31:57,499 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:31:57,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-07 08:31:57,500 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:31:57,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:31:57,500 INFO L85 PathProgramCache]: Analyzing trace with hash -464590397, now seen corresponding path program 1 times [2021-11-07 08:31:57,501 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:31:57,501 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239587021] [2021-11-07 08:31:57,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:31:57,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:31:57,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:31:57,929 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:31:57,930 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:31:57,930 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239587021] [2021-11-07 08:31:57,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [239587021] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:31:57,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [951283064] [2021-11-07 08:31:57,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:31:57,931 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:31:57,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:31:57,934 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:31:57,936 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-07 08:31:58,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:31:58,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-07 08:31:58,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:31:58,851 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-07 08:31:58,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [951283064] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:31:58,852 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:31:58,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 14 [2021-11-07 08:31:58,853 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952497603] [2021-11-07 08:31:58,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-07 08:31:58,856 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:31:58,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-07 08:31:58,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2021-11-07 08:31:58,860 INFO L87 Difference]: Start difference. First operand 2135 states and 3054 transitions. Second operand has 14 states, 14 states have (on average 9.142857142857142) internal successors, (128), 14 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:04,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:32:04,485 INFO L93 Difference]: Finished difference Result 17802 states and 25086 transitions. [2021-11-07 08:32:04,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-07 08:32:04,486 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 9.142857142857142) internal successors, (128), 14 states have internal predecessors, (128), 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) Word has length 67 [2021-11-07 08:32:04,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:32:04,590 INFO L225 Difference]: With dead ends: 17802 [2021-11-07 08:32:04,591 INFO L226 Difference]: Without dead ends: 15692 [2021-11-07 08:32:04,600 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1966 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1036, Invalid=4664, Unknown=0, NotChecked=0, Total=5700 [2021-11-07 08:32:04,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15692 states. [2021-11-07 08:32:05,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15692 to 7871. [2021-11-07 08:32:05,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7871 states, 7870 states have (on average 1.404574332909784) internal successors, (11054), 7870 states have internal predecessors, (11054), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:05,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7871 states to 7871 states and 11054 transitions. [2021-11-07 08:32:05,442 INFO L78 Accepts]: Start accepts. Automaton has 7871 states and 11054 transitions. Word has length 67 [2021-11-07 08:32:05,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:32:05,443 INFO L470 AbstractCegarLoop]: Abstraction has 7871 states and 11054 transitions. [2021-11-07 08:32:05,443 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 9.142857142857142) internal successors, (128), 14 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:05,443 INFO L276 IsEmpty]: Start isEmpty. Operand 7871 states and 11054 transitions. [2021-11-07 08:32:05,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 08:32:05,447 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:32:05,448 INFO L513 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:32:05,489 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-07 08:32:05,664 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:32:05,664 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:32:05,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:32:05,666 INFO L85 PathProgramCache]: Analyzing trace with hash -360407612, now seen corresponding path program 1 times [2021-11-07 08:32:05,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:32:05,666 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723586523] [2021-11-07 08:32:05,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:32:05,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:32:05,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:32:05,736 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:32:05,737 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:32:05,737 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723586523] [2021-11-07 08:32:05,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723586523] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:32:05,738 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:32:05,738 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 08:32:05,738 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [491732227] [2021-11-07 08:32:05,741 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 08:32:05,742 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:32:05,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 08:32:05,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 08:32:05,743 INFO L87 Difference]: Start difference. First operand 7871 states and 11054 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:06,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:32:06,653 INFO L93 Difference]: Finished difference Result 17430 states and 24438 transitions. [2021-11-07 08:32:06,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 08:32:06,654 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 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) Word has length 67 [2021-11-07 08:32:06,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:32:06,718 INFO L225 Difference]: With dead ends: 17430 [2021-11-07 08:32:06,718 INFO L226 Difference]: Without dead ends: 11722 [2021-11-07 08:32:06,728 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 08:32:06,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11722 states. [2021-11-07 08:32:07,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11722 to 11720. [2021-11-07 08:32:07,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11720 states, 11719 states have (on average 1.3782745968086014) internal successors, (16152), 11719 states have internal predecessors, (16152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:07,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11720 states to 11720 states and 16152 transitions. [2021-11-07 08:32:07,875 INFO L78 Accepts]: Start accepts. Automaton has 11720 states and 16152 transitions. Word has length 67 [2021-11-07 08:32:07,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:32:07,876 INFO L470 AbstractCegarLoop]: Abstraction has 11720 states and 16152 transitions. [2021-11-07 08:32:07,877 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:07,877 INFO L276 IsEmpty]: Start isEmpty. Operand 11720 states and 16152 transitions. [2021-11-07 08:32:07,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 08:32:07,883 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:32:07,883 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:32:07,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-07 08:32:07,884 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:32:07,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:32:07,885 INFO L85 PathProgramCache]: Analyzing trace with hash 445941124, now seen corresponding path program 1 times [2021-11-07 08:32:07,885 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:32:07,886 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256196734] [2021-11-07 08:32:07,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:32:07,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:32:07,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:32:07,950 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:32:07,950 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:32:07,951 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256196734] [2021-11-07 08:32:07,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1256196734] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:32:07,951 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:32:07,952 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 08:32:07,952 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629902943] [2021-11-07 08:32:07,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 08:32:07,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:32:07,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 08:32:07,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 08:32:07,954 INFO L87 Difference]: Start difference. First operand 11720 states and 16152 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:09,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:32:09,144 INFO L93 Difference]: Finished difference Result 23659 states and 32400 transitions. [2021-11-07 08:32:09,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 08:32:09,145 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 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) Word has length 67 [2021-11-07 08:32:09,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:32:09,191 INFO L225 Difference]: With dead ends: 23659 [2021-11-07 08:32:09,192 INFO L226 Difference]: Without dead ends: 16111 [2021-11-07 08:32:09,207 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 08:32:09,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16111 states. [2021-11-07 08:32:10,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16111 to 16109. [2021-11-07 08:32:10,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16109 states, 16108 states have (on average 1.353116463868885) internal successors, (21796), 16108 states have internal predecessors, (21796), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:10,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16109 states to 16109 states and 21796 transitions. [2021-11-07 08:32:10,719 INFO L78 Accepts]: Start accepts. Automaton has 16109 states and 21796 transitions. Word has length 67 [2021-11-07 08:32:10,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:32:10,720 INFO L470 AbstractCegarLoop]: Abstraction has 16109 states and 21796 transitions. [2021-11-07 08:32:10,720 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:10,720 INFO L276 IsEmpty]: Start isEmpty. Operand 16109 states and 21796 transitions. [2021-11-07 08:32:10,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 08:32:10,726 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:32:10,727 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:32:10,727 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-07 08:32:10,728 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:32:10,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:32:10,729 INFO L85 PathProgramCache]: Analyzing trace with hash 873287188, now seen corresponding path program 1 times [2021-11-07 08:32:10,731 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:32:10,731 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1025793762] [2021-11-07 08:32:10,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:32:10,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:32:10,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:32:10,805 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 08:32:10,805 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:32:10,805 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1025793762] [2021-11-07 08:32:10,806 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1025793762] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:32:10,806 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:32:10,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 08:32:10,810 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642964973] [2021-11-07 08:32:10,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 08:32:10,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:32:10,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 08:32:10,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-07 08:32:10,812 INFO L87 Difference]: Start difference. First operand 16109 states and 21796 transitions. Second operand has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:12,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:32:12,034 INFO L93 Difference]: Finished difference Result 28133 states and 38246 transitions. [2021-11-07 08:32:12,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 08:32:12,036 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 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) Word has length 67 [2021-11-07 08:32:12,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:32:12,101 INFO L225 Difference]: With dead ends: 28133 [2021-11-07 08:32:12,101 INFO L226 Difference]: Without dead ends: 23339 [2021-11-07 08:32:12,111 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-07 08:32:12,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23339 states. [2021-11-07 08:32:13,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23339 to 20637. [2021-11-07 08:32:13,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20637 states, 20636 states have (on average 1.3488079085094011) internal successors, (27834), 20636 states have internal predecessors, (27834), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:13,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20637 states to 20637 states and 27834 transitions. [2021-11-07 08:32:13,522 INFO L78 Accepts]: Start accepts. Automaton has 20637 states and 27834 transitions. Word has length 67 [2021-11-07 08:32:13,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:32:13,523 INFO L470 AbstractCegarLoop]: Abstraction has 20637 states and 27834 transitions. [2021-11-07 08:32:13,523 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:13,523 INFO L276 IsEmpty]: Start isEmpty. Operand 20637 states and 27834 transitions. [2021-11-07 08:32:13,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 08:32:13,530 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:32:13,531 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:32:13,531 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-07 08:32:13,531 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:32:13,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:32:13,532 INFO L85 PathProgramCache]: Analyzing trace with hash -1380691940, now seen corresponding path program 1 times [2021-11-07 08:32:13,532 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:32:13,533 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141505923] [2021-11-07 08:32:13,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:32:13,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:32:13,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:32:13,600 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 08:32:13,601 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:32:13,601 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141505923] [2021-11-07 08:32:13,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141505923] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:32:13,601 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:32:13,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 08:32:13,602 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428238891] [2021-11-07 08:32:13,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 08:32:13,603 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:32:13,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 08:32:13,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-07 08:32:13,604 INFO L87 Difference]: Start difference. First operand 20637 states and 27834 transitions. Second operand has 5 states, 5 states have (on average 12.2) internal successors, (61), 5 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:14,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:32:14,895 INFO L93 Difference]: Finished difference Result 34901 states and 47450 transitions. [2021-11-07 08:32:14,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 08:32:14,896 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.2) internal successors, (61), 5 states have internal predecessors, (61), 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) Word has length 67 [2021-11-07 08:32:14,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:32:14,979 INFO L225 Difference]: With dead ends: 34901 [2021-11-07 08:32:14,979 INFO L226 Difference]: Without dead ends: 27735 [2021-11-07 08:32:14,997 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-07 08:32:15,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27735 states. [2021-11-07 08:32:16,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27735 to 25925. [2021-11-07 08:32:16,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25925 states, 25924 states have (on average 1.3450084863446998) internal successors, (34868), 25924 states have internal predecessors, (34868), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:16,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25925 states to 25925 states and 34868 transitions. [2021-11-07 08:32:16,803 INFO L78 Accepts]: Start accepts. Automaton has 25925 states and 34868 transitions. Word has length 67 [2021-11-07 08:32:16,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:32:16,803 INFO L470 AbstractCegarLoop]: Abstraction has 25925 states and 34868 transitions. [2021-11-07 08:32:16,804 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.2) internal successors, (61), 5 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:16,804 INFO L276 IsEmpty]: Start isEmpty. Operand 25925 states and 34868 transitions. [2021-11-07 08:32:16,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-07 08:32:16,811 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:32:16,812 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:32:16,812 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-07 08:32:16,812 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:32:16,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:32:16,813 INFO L85 PathProgramCache]: Analyzing trace with hash 1025819592, now seen corresponding path program 1 times [2021-11-07 08:32:16,813 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:32:16,814 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651886437] [2021-11-07 08:32:16,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:32:16,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:32:16,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:32:16,888 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-07 08:32:16,889 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:32:16,889 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651886437] [2021-11-07 08:32:16,889 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1651886437] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:32:16,889 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:32:16,890 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 08:32:16,890 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864402030] [2021-11-07 08:32:16,891 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 08:32:16,892 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:32:16,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 08:32:16,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-07 08:32:16,893 INFO L87 Difference]: Start difference. First operand 25925 states and 34868 transitions. Second operand has 5 states, 5 states have (on average 13.4) internal successors, (67), 5 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:18,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:32:18,308 INFO L93 Difference]: Finished difference Result 33549 states and 45330 transitions. [2021-11-07 08:32:18,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 08:32:18,309 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.4) internal successors, (67), 5 states have internal predecessors, (67), 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) Word has length 68 [2021-11-07 08:32:18,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:32:18,363 INFO L225 Difference]: With dead ends: 33549 [2021-11-07 08:32:18,364 INFO L226 Difference]: Without dead ends: 30311 [2021-11-07 08:32:18,376 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-07 08:32:18,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30311 states. [2021-11-07 08:32:20,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30311 to 28501. [2021-11-07 08:32:20,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28501 states, 28500 states have (on average 1.3439298245614035) internal successors, (38302), 28500 states have internal predecessors, (38302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:20,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28501 states to 28501 states and 38302 transitions. [2021-11-07 08:32:20,256 INFO L78 Accepts]: Start accepts. Automaton has 28501 states and 38302 transitions. Word has length 68 [2021-11-07 08:32:20,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:32:20,257 INFO L470 AbstractCegarLoop]: Abstraction has 28501 states and 38302 transitions. [2021-11-07 08:32:20,257 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.4) internal successors, (67), 5 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:20,257 INFO L276 IsEmpty]: Start isEmpty. Operand 28501 states and 38302 transitions. [2021-11-07 08:32:20,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-07 08:32:20,269 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:32:20,269 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:32:20,269 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-07 08:32:20,270 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:32:20,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:32:20,270 INFO L85 PathProgramCache]: Analyzing trace with hash 278524473, now seen corresponding path program 1 times [2021-11-07 08:32:20,270 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:32:20,270 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1023015526] [2021-11-07 08:32:20,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:32:20,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:32:20,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:32:20,324 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:32:20,324 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:32:20,324 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1023015526] [2021-11-07 08:32:20,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1023015526] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:32:20,325 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:32:20,325 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 08:32:20,325 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316477914] [2021-11-07 08:32:20,326 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 08:32:20,326 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:32:20,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 08:32:20,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 08:32:20,327 INFO L87 Difference]: Start difference. First operand 28501 states and 38302 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:22,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:32:22,214 INFO L93 Difference]: Finished difference Result 52235 states and 69877 transitions. [2021-11-07 08:32:22,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 08:32:22,215 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 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) Word has length 70 [2021-11-07 08:32:22,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:32:22,257 INFO L225 Difference]: With dead ends: 52235 [2021-11-07 08:32:22,257 INFO L226 Difference]: Without dead ends: 29309 [2021-11-07 08:32:22,291 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 08:32:22,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29309 states. [2021-11-07 08:32:23,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29309 to 28578. [2021-11-07 08:32:23,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28578 states, 28577 states have (on average 1.328480946215488) internal successors, (37964), 28577 states have internal predecessors, (37964), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:23,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28578 states to 28578 states and 37964 transitions. [2021-11-07 08:32:23,964 INFO L78 Accepts]: Start accepts. Automaton has 28578 states and 37964 transitions. Word has length 70 [2021-11-07 08:32:23,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:32:23,964 INFO L470 AbstractCegarLoop]: Abstraction has 28578 states and 37964 transitions. [2021-11-07 08:32:23,964 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:23,964 INFO L276 IsEmpty]: Start isEmpty. Operand 28578 states and 37964 transitions. [2021-11-07 08:32:23,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 08:32:23,976 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:32:23,976 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:32:23,976 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-07 08:32:23,976 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:32:23,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:32:23,977 INFO L85 PathProgramCache]: Analyzing trace with hash 1557352907, now seen corresponding path program 1 times [2021-11-07 08:32:23,978 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:32:23,978 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402224475] [2021-11-07 08:32:23,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:32:23,978 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:32:24,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:32:24,032 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:32:24,033 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:32:24,033 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402224475] [2021-11-07 08:32:24,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1402224475] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:32:24,033 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:32:24,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 08:32:24,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281989716] [2021-11-07 08:32:24,034 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 08:32:24,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:32:24,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 08:32:24,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 08:32:24,036 INFO L87 Difference]: Start difference. First operand 28578 states and 37964 transitions. Second operand has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:25,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:32:25,308 INFO L93 Difference]: Finished difference Result 45058 states and 59700 transitions. [2021-11-07 08:32:25,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 08:32:25,309 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 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) Word has length 71 [2021-11-07 08:32:25,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:32:25,351 INFO L225 Difference]: With dead ends: 45058 [2021-11-07 08:32:25,351 INFO L226 Difference]: Without dead ends: 28596 [2021-11-07 08:32:25,370 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 08:32:25,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28596 states. [2021-11-07 08:32:27,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28596 to 24218. [2021-11-07 08:32:27,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24218 states, 24217 states have (on average 1.3162654333732502) internal successors, (31876), 24217 states have internal predecessors, (31876), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:27,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24218 states to 24218 states and 31876 transitions. [2021-11-07 08:32:27,321 INFO L78 Accepts]: Start accepts. Automaton has 24218 states and 31876 transitions. Word has length 71 [2021-11-07 08:32:27,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:32:27,322 INFO L470 AbstractCegarLoop]: Abstraction has 24218 states and 31876 transitions. [2021-11-07 08:32:27,322 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:27,322 INFO L276 IsEmpty]: Start isEmpty. Operand 24218 states and 31876 transitions. [2021-11-07 08:32:27,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 08:32:27,330 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:32:27,330 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:32:27,330 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-07 08:32:27,331 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:32:27,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:32:27,331 INFO L85 PathProgramCache]: Analyzing trace with hash -53841773, now seen corresponding path program 1 times [2021-11-07 08:32:27,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:32:27,332 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801697964] [2021-11-07 08:32:27,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:32:27,332 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:32:27,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:32:27,421 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 08:32:27,422 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:32:27,422 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801697964] [2021-11-07 08:32:27,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1801697964] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 08:32:27,422 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 08:32:27,422 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-07 08:32:27,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905023934] [2021-11-07 08:32:27,423 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 08:32:27,423 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:32:27,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 08:32:27,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-07 08:32:27,425 INFO L87 Difference]: Start difference. First operand 24218 states and 31876 transitions. Second operand has 7 states, 7 states have (on average 9.571428571428571) internal successors, (67), 6 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:31,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:32:31,121 INFO L93 Difference]: Finished difference Result 84171 states and 110484 transitions. [2021-11-07 08:32:31,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 08:32:31,121 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 9.571428571428571) internal successors, (67), 6 states have internal predecessors, (67), 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) Word has length 71 [2021-11-07 08:32:31,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:32:31,235 INFO L225 Difference]: With dead ends: 84171 [2021-11-07 08:32:31,235 INFO L226 Difference]: Without dead ends: 60004 [2021-11-07 08:32:31,264 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=39, Invalid=51, Unknown=0, NotChecked=0, Total=90 [2021-11-07 08:32:31,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60004 states. [2021-11-07 08:32:34,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60004 to 57822. [2021-11-07 08:32:35,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57822 states, 57821 states have (on average 1.3070856609190433) internal successors, (75577), 57821 states have internal predecessors, (75577), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:35,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57822 states to 57822 states and 75577 transitions. [2021-11-07 08:32:35,315 INFO L78 Accepts]: Start accepts. Automaton has 57822 states and 75577 transitions. Word has length 71 [2021-11-07 08:32:35,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:32:35,316 INFO L470 AbstractCegarLoop]: Abstraction has 57822 states and 75577 transitions. [2021-11-07 08:32:35,316 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 9.571428571428571) internal successors, (67), 6 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:35,316 INFO L276 IsEmpty]: Start isEmpty. Operand 57822 states and 75577 transitions. [2021-11-07 08:32:35,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 08:32:35,327 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:32:35,327 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:32:35,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-07 08:32:35,328 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:32:35,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:32:35,329 INFO L85 PathProgramCache]: Analyzing trace with hash 1317965525, now seen corresponding path program 1 times [2021-11-07 08:32:35,329 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:32:35,329 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [430745620] [2021-11-07 08:32:35,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:32:35,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:32:35,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:32:35,417 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:32:35,417 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:32:35,418 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [430745620] [2021-11-07 08:32:35,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [430745620] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:32:35,418 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1703591212] [2021-11-07 08:32:35,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:32:35,419 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:32:35,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:32:35,420 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:32:35,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-07 08:32:35,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:32:35,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 08:32:35,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:32:36,207 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:32:36,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1703591212] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:32:36,208 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:32:36,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-11-07 08:32:36,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097517395] [2021-11-07 08:32:36,209 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-07 08:32:36,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:32:36,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-07 08:32:36,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-11-07 08:32:36,210 INFO L87 Difference]: Start difference. First operand 57822 states and 75577 transitions. Second operand has 11 states, 11 states have (on average 10.909090909090908) internal successors, (120), 10 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:43,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 08:32:43,274 INFO L93 Difference]: Finished difference Result 143919 states and 188193 transitions. [2021-11-07 08:32:43,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-07 08:32:43,274 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 10.909090909090908) internal successors, (120), 10 states have internal predecessors, (120), 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) Word has length 71 [2021-11-07 08:32:43,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 08:32:43,455 INFO L225 Difference]: With dead ends: 143919 [2021-11-07 08:32:43,455 INFO L226 Difference]: Without dead ends: 102817 [2021-11-07 08:32:43,496 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=95, Invalid=211, Unknown=0, NotChecked=0, Total=306 [2021-11-07 08:32:43,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102817 states. [2021-11-07 08:32:48,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102817 to 62872. [2021-11-07 08:32:48,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62872 states, 62871 states have (on average 1.3088864500326065) internal successors, (82291), 62871 states have internal predecessors, (82291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:48,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62872 states to 62872 states and 82291 transitions. [2021-11-07 08:32:48,371 INFO L78 Accepts]: Start accepts. Automaton has 62872 states and 82291 transitions. Word has length 71 [2021-11-07 08:32:48,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 08:32:48,371 INFO L470 AbstractCegarLoop]: Abstraction has 62872 states and 82291 transitions. [2021-11-07 08:32:48,371 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 10.909090909090908) internal successors, (120), 10 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 08:32:48,371 INFO L276 IsEmpty]: Start isEmpty. Operand 62872 states and 82291 transitions. [2021-11-07 08:32:48,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-07 08:32:48,383 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 08:32:48,384 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 08:32:48,417 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-07 08:32:48,601 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-07 08:32:48,602 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 08:32:48,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 08:32:48,602 INFO L85 PathProgramCache]: Analyzing trace with hash 487943403, now seen corresponding path program 1 times [2021-11-07 08:32:48,602 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-07 08:32:48,603 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136784415] [2021-11-07 08:32:48,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:32:48,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 08:32:48,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:32:48,705 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:32:48,705 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-07 08:32:48,706 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136784415] [2021-11-07 08:32:48,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1136784415] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:32:48,706 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1544395436] [2021-11-07 08:32:48,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 08:32:48,707 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 08:32:48,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/z3 [2021-11-07 08:32:48,708 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 08:32:48,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_008fa24f-868c-4e9a-970c-96510a716d18/bin/uautomizer-AkOaLMaTGY/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-07 08:32:48,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 08:32:48,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 08:32:48,931 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 08:32:49,445 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 08:32:49,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1544395436] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 08:32:49,446 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-07 08:32:49,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-11-07 08:32:49,447 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129866817] [2021-11-07 08:32:49,448 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-07 08:32:49,448 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-07 08:32:49,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-07 08:32:49,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-11-07 08:32:49,450 INFO L87 Difference]: Start difference. First operand 62872 states and 82291 transitions. Second operand has 11 states, 11 states have (on average 11.090909090909092) internal successors, (122), 10 states have internal predecessors, (122), 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)