./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/heap-manipulation/dancing.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/heap-manipulation/dancing.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash c2e0266b63b958a771d0226973905d5a39a7a28d05d194ae66381394d9ab520a --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-02 23:17:10,737 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-02 23:17:10,740 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-02 23:17:10,789 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-02 23:17:10,790 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-02 23:17:10,792 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-02 23:17:10,794 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-02 23:17:10,798 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-02 23:17:10,800 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-02 23:17:10,802 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-02 23:17:10,804 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-02 23:17:10,806 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-02 23:17:10,807 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-02 23:17:10,808 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-02 23:17:10,811 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-02 23:17:10,813 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-02 23:17:10,814 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-02 23:17:10,816 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-02 23:17:10,819 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-02 23:17:10,822 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-02 23:17:10,825 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-02 23:17:10,827 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-02 23:17:10,829 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-02 23:17:10,831 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-02 23:17:10,836 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-02 23:17:10,836 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-02 23:17:10,837 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-02 23:17:10,839 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-02 23:17:10,839 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-02 23:17:10,841 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-02 23:17:10,842 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-02 23:17:10,843 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-02 23:17:10,845 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-02 23:17:10,846 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-02 23:17:10,848 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-02 23:17:10,849 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-02 23:17:10,850 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-02 23:17:10,851 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-02 23:17:10,851 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-02 23:17:10,853 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-02 23:17:10,854 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-02 23:17:10,856 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-11-02 23:17:10,898 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-02 23:17:10,902 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-02 23:17:10,903 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-02 23:17:10,911 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-02 23:17:10,913 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-02 23:17:10,915 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-02 23:17:10,915 INFO L138 SettingsManager]: * Use SBE=true [2021-11-02 23:17:10,915 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-02 23:17:10,916 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-02 23:17:10,916 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-02 23:17:10,917 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-02 23:17:10,918 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-02 23:17:10,918 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-02 23:17:10,919 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-02 23:17:10,919 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-02 23:17:10,919 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-02 23:17:10,920 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-02 23:17:10,920 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-02 23:17:10,920 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-02 23:17:10,921 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-02 23:17:10,921 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-02 23:17:10,921 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-02 23:17:10,922 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-02 23:17:10,922 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 23:17:10,922 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-02 23:17:10,923 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-02 23:17:10,923 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-02 23:17:10,923 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-02 23:17:10,924 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-02 23:17:10,926 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_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c2e0266b63b958a771d0226973905d5a39a7a28d05d194ae66381394d9ab520a [2021-11-02 23:17:11,246 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-02 23:17:11,285 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-02 23:17:11,288 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-02 23:17:11,290 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-02 23:17:11,292 INFO L275 PluginConnector]: CDTParser initialized [2021-11-02 23:17:11,293 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/../../sv-benchmarks/c/heap-manipulation/dancing.i [2021-11-02 23:17:11,394 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/data/57cc33ef1/521e4789b25a48fb8130fccee64fad15/FLAG7b43f7662 [2021-11-02 23:17:12,077 INFO L306 CDTParser]: Found 1 translation units. [2021-11-02 23:17:12,079 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/sv-benchmarks/c/heap-manipulation/dancing.i [2021-11-02 23:17:12,106 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/data/57cc33ef1/521e4789b25a48fb8130fccee64fad15/FLAG7b43f7662 [2021-11-02 23:17:12,363 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/data/57cc33ef1/521e4789b25a48fb8130fccee64fad15 [2021-11-02 23:17:12,366 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-02 23:17:12,370 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-02 23:17:12,372 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-02 23:17:12,372 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-02 23:17:12,377 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-02 23:17:12,378 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 11:17:12" (1/1) ... [2021-11-02 23:17:12,381 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@78273fad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:17:12, skipping insertion in model container [2021-11-02 23:17:12,381 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 11:17:12" (1/1) ... [2021-11-02 23:17:12,390 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-02 23:17:12,457 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-02 23:17:12,664 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_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/sv-benchmarks/c/heap-manipulation/dancing.i[938,951] [2021-11-02 23:17:12,839 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 23:17:12,854 INFO L203 MainTranslator]: Completed pre-run [2021-11-02 23:17:12,878 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_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/sv-benchmarks/c/heap-manipulation/dancing.i[938,951] [2021-11-02 23:17:12,926 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 23:17:12,964 INFO L208 MainTranslator]: Completed translation [2021-11-02 23:17:12,965 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:17:12 WrapperNode [2021-11-02 23:17:12,965 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-02 23:17:12,966 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-02 23:17:12,967 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-02 23:17:12,967 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-02 23:17:12,978 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:17:12" (1/1) ... [2021-11-02 23:17:12,978 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:17:12" (1/1) ... [2021-11-02 23:17:12,996 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:17:12" (1/1) ... [2021-11-02 23:17:12,996 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:17:12" (1/1) ... [2021-11-02 23:17:13,021 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:17:12" (1/1) ... [2021-11-02 23:17:13,027 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:17:12" (1/1) ... [2021-11-02 23:17:13,032 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:17:12" (1/1) ... [2021-11-02 23:17:13,041 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-02 23:17:13,042 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-02 23:17:13,042 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-02 23:17:13,043 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-02 23:17:13,044 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:17:12" (1/1) ... [2021-11-02 23:17:13,053 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 23:17:13,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:17:13,082 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-02 23:17:13,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-02 23:17:13,145 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-02 23:17:13,145 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-02 23:17:13,146 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-02 23:17:13,146 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-11-02 23:17:13,146 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-02 23:17:13,147 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-02 23:17:13,147 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-02 23:17:13,147 INFO L138 BoogieDeclarations]: Found implementation of procedure remove [2021-11-02 23:17:13,148 INFO L138 BoogieDeclarations]: Found implementation of procedure re_insert [2021-11-02 23:17:13,149 INFO L138 BoogieDeclarations]: Found implementation of procedure is_list_containing_x [2021-11-02 23:17:13,149 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-02 23:17:13,149 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-02 23:17:13,149 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-02 23:17:13,149 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2021-11-02 23:17:13,150 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-11-02 23:17:13,150 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-11-02 23:17:13,150 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-11-02 23:17:13,150 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-11-02 23:17:13,150 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-02 23:17:13,150 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-02 23:17:13,151 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-02 23:17:13,151 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-02 23:17:13,151 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-02 23:17:13,151 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-02 23:17:13,151 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-02 23:17:13,151 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-02 23:17:13,152 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-02 23:17:13,152 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-02 23:17:13,152 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-02 23:17:13,152 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-02 23:17:13,152 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-02 23:17:13,153 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-02 23:17:13,153 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-02 23:17:13,153 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-02 23:17:13,153 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-02 23:17:13,153 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-02 23:17:13,153 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-02 23:17:13,154 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-02 23:17:13,154 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-02 23:17:13,154 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-02 23:17:13,154 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-02 23:17:13,154 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-02 23:17:13,154 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-02 23:17:13,155 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-02 23:17:13,155 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-02 23:17:13,155 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-02 23:17:13,156 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-02 23:17:13,156 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-02 23:17:13,156 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-02 23:17:13,157 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-02 23:17:13,157 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-02 23:17:13,157 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-02 23:17:13,158 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-02 23:17:13,158 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-02 23:17:13,159 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-02 23:17:13,159 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-02 23:17:13,159 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-02 23:17:13,159 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-02 23:17:13,159 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-02 23:17:13,159 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-02 23:17:13,160 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-02 23:17:13,160 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-02 23:17:13,160 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-02 23:17:13,160 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-02 23:17:13,161 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-02 23:17:13,161 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-02 23:17:13,162 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-02 23:17:13,163 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-02 23:17:13,163 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-02 23:17:13,164 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-02 23:17:13,164 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-02 23:17:13,164 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-02 23:17:13,164 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-02 23:17:13,164 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-02 23:17:13,165 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-02 23:17:13,165 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-02 23:17:13,165 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2021-11-02 23:17:13,165 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-02 23:17:13,165 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-02 23:17:13,166 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-02 23:17:13,166 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-02 23:17:13,167 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-02 23:17:13,167 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-02 23:17:13,167 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-02 23:17:13,167 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-02 23:17:13,167 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-02 23:17:13,167 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-02 23:17:13,168 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-02 23:17:13,168 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-02 23:17:13,168 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-02 23:17:13,168 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-02 23:17:13,168 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-02 23:17:13,168 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-02 23:17:13,169 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-02 23:17:13,169 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-02 23:17:13,169 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-02 23:17:13,169 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-02 23:17:13,169 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-02 23:17:13,169 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-02 23:17:13,170 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-02 23:17:13,170 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-02 23:17:13,170 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-02 23:17:13,170 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-02 23:17:13,170 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-02 23:17:13,171 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-02 23:17:13,171 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-02 23:17:13,171 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-02 23:17:13,171 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-02 23:17:13,172 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-02 23:17:13,173 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-02 23:17:13,173 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-02 23:17:13,173 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-02 23:17:13,174 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-02 23:17:13,174 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-02 23:17:13,174 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-02 23:17:13,174 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-02 23:17:13,174 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-02 23:17:13,174 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-02 23:17:13,175 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-02 23:17:13,175 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-02 23:17:13,175 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-02 23:17:13,175 INFO L130 BoogieDeclarations]: Found specification of procedure remove [2021-11-02 23:17:13,175 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-02 23:17:13,176 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-02 23:17:13,176 INFO L130 BoogieDeclarations]: Found specification of procedure re_insert [2021-11-02 23:17:13,176 INFO L130 BoogieDeclarations]: Found specification of procedure is_list_containing_x [2021-11-02 23:17:13,177 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-02 23:17:13,178 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-02 23:17:13,181 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-02 23:17:13,181 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-02 23:17:13,181 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-02 23:17:13,183 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-02 23:17:13,184 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-02 23:17:13,184 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-02 23:17:13,881 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-02 23:17:13,881 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-02 23:17:13,884 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 11:17:13 BoogieIcfgContainer [2021-11-02 23:17:13,884 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-02 23:17:13,886 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-02 23:17:13,886 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-02 23:17:13,891 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-02 23:17:13,891 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 11:17:12" (1/3) ... [2021-11-02 23:17:13,892 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f853c32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 11:17:13, skipping insertion in model container [2021-11-02 23:17:13,892 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:17:12" (2/3) ... [2021-11-02 23:17:13,892 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f853c32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 11:17:13, skipping insertion in model container [2021-11-02 23:17:13,893 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 11:17:13" (3/3) ... [2021-11-02 23:17:13,894 INFO L111 eAbstractionObserver]: Analyzing ICFG dancing.i [2021-11-02 23:17:13,901 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-02 23:17:13,901 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 44 error locations. [2021-11-02 23:17:13,963 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-02 23:17:13,971 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-02 23:17:13,971 INFO L340 AbstractCegarLoop]: Starting to check reachability of 44 error locations. [2021-11-02 23:17:13,992 INFO L276 IsEmpty]: Start isEmpty. Operand has 123 states, 60 states have (on average 1.95) internal successors, (117), 104 states have internal predecessors, (117), 11 states have call successors, (11), 7 states have call predecessors, (11), 7 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-11-02 23:17:14,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-02 23:17:14,001 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:14,002 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:17:14,002 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:14,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:14,009 INFO L85 PathProgramCache]: Analyzing trace with hash 1251690577, now seen corresponding path program 1 times [2021-11-02 23:17:14,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:14,021 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165364341] [2021-11-02 23:17:14,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:14,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:14,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:14,262 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:14,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:14,310 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:14,310 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:14,311 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165364341] [2021-11-02 23:17:14,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1165364341] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:17:14,312 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:17:14,312 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 23:17:14,315 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101597811] [2021-11-02 23:17:14,321 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 23:17:14,332 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:14,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 23:17:14,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 23:17:14,353 INFO L87 Difference]: Start difference. First operand has 123 states, 60 states have (on average 1.95) internal successors, (117), 104 states have internal predecessors, (117), 11 states have call successors, (11), 7 states have call predecessors, (11), 7 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:14,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:14,828 INFO L93 Difference]: Finished difference Result 121 states and 134 transitions. [2021-11-02 23:17:14,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 23:17:14,830 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 7 [2021-11-02 23:17:14,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:14,844 INFO L225 Difference]: With dead ends: 121 [2021-11-02 23:17:14,845 INFO L226 Difference]: Without dead ends: 118 [2021-11-02 23:17:14,847 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 23:17:14,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-11-02 23:17:14,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2021-11-02 23:17:14,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 59 states have (on average 1.8644067796610169) internal successors, (110), 100 states have internal predecessors, (110), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-02 23:17:14,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 131 transitions. [2021-11-02 23:17:14,902 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 131 transitions. Word has length 7 [2021-11-02 23:17:14,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:14,902 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 131 transitions. [2021-11-02 23:17:14,903 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:14,903 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 131 transitions. [2021-11-02 23:17:14,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-02 23:17:14,904 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:14,904 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:17:14,904 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-02 23:17:14,904 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr1REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:14,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:14,905 INFO L85 PathProgramCache]: Analyzing trace with hash 1251690578, now seen corresponding path program 1 times [2021-11-02 23:17:14,906 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:14,906 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1561647153] [2021-11-02 23:17:14,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:14,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:14,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:15,036 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:15,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:15,070 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:15,071 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:15,071 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1561647153] [2021-11-02 23:17:15,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1561647153] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:17:15,072 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:17:15,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 23:17:15,072 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657601911] [2021-11-02 23:17:15,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 23:17:15,074 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:15,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 23:17:15,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 23:17:15,082 INFO L87 Difference]: Start difference. First operand 118 states and 131 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:15,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:15,504 INFO L93 Difference]: Finished difference Result 116 states and 129 transitions. [2021-11-02 23:17:15,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 23:17:15,505 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 7 [2021-11-02 23:17:15,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:15,513 INFO L225 Difference]: With dead ends: 116 [2021-11-02 23:17:15,513 INFO L226 Difference]: Without dead ends: 116 [2021-11-02 23:17:15,514 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 23:17:15,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-02 23:17:15,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2021-11-02 23:17:15,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 59 states have (on average 1.8305084745762712) internal successors, (108), 98 states have internal predecessors, (108), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-02 23:17:15,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 129 transitions. [2021-11-02 23:17:15,546 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 129 transitions. Word has length 7 [2021-11-02 23:17:15,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:15,547 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 129 transitions. [2021-11-02 23:17:15,549 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:15,549 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 129 transitions. [2021-11-02 23:17:15,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-02 23:17:15,551 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:15,551 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:17:15,551 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-02 23:17:15,552 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr4REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:15,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:15,553 INFO L85 PathProgramCache]: Analyzing trace with hash -2003091247, now seen corresponding path program 1 times [2021-11-02 23:17:15,553 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:15,553 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112408741] [2021-11-02 23:17:15,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:15,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:15,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:15,691 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:15,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:15,727 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:15,727 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:15,727 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112408741] [2021-11-02 23:17:15,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112408741] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:17:15,728 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:17:15,728 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 23:17:15,728 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293418653] [2021-11-02 23:17:15,729 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 23:17:15,729 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:15,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 23:17:15,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 23:17:15,736 INFO L87 Difference]: Start difference. First operand 116 states and 129 transitions. Second operand has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:16,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:16,139 INFO L93 Difference]: Finished difference Result 129 states and 152 transitions. [2021-11-02 23:17:16,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 23:17:16,140 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-02 23:17:16,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:16,142 INFO L225 Difference]: With dead ends: 129 [2021-11-02 23:17:16,144 INFO L226 Difference]: Without dead ends: 129 [2021-11-02 23:17:16,145 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 23:17:16,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-02 23:17:16,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 114. [2021-11-02 23:17:16,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 59 states have (on average 1.7966101694915255) internal successors, (106), 96 states have internal predecessors, (106), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-02 23:17:16,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 127 transitions. [2021-11-02 23:17:16,164 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 127 transitions. Word has length 12 [2021-11-02 23:17:16,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:16,165 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 127 transitions. [2021-11-02 23:17:16,165 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:16,165 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 127 transitions. [2021-11-02 23:17:16,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-02 23:17:16,166 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:16,166 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:17:16,167 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-02 23:17:16,167 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr5REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:16,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:16,169 INFO L85 PathProgramCache]: Analyzing trace with hash -2003091246, now seen corresponding path program 1 times [2021-11-02 23:17:16,169 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:16,170 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [835158088] [2021-11-02 23:17:16,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:16,170 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:16,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:16,299 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:16,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:16,327 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:16,327 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:16,327 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [835158088] [2021-11-02 23:17:16,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [835158088] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:17:16,328 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:17:16,328 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 23:17:16,328 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977627235] [2021-11-02 23:17:16,329 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 23:17:16,329 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:16,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 23:17:16,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 23:17:16,330 INFO L87 Difference]: Start difference. First operand 114 states and 127 transitions. Second operand has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:16,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:16,717 INFO L93 Difference]: Finished difference Result 129 states and 151 transitions. [2021-11-02 23:17:16,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 23:17:16,718 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-02 23:17:16,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:16,720 INFO L225 Difference]: With dead ends: 129 [2021-11-02 23:17:16,720 INFO L226 Difference]: Without dead ends: 129 [2021-11-02 23:17:16,721 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 23:17:16,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-02 23:17:16,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 112. [2021-11-02 23:17:16,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 59 states have (on average 1.7627118644067796) internal successors, (104), 94 states have internal predecessors, (104), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-02 23:17:16,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 125 transitions. [2021-11-02 23:17:16,732 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 125 transitions. Word has length 12 [2021-11-02 23:17:16,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:16,732 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 125 transitions. [2021-11-02 23:17:16,732 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:16,733 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 125 transitions. [2021-11-02 23:17:16,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-02 23:17:16,733 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:16,734 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:17:16,734 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-02 23:17:16,734 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting is_list_containing_xErr1REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:16,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:16,735 INFO L85 PathProgramCache]: Analyzing trace with hash -824686821, now seen corresponding path program 1 times [2021-11-02 23:17:16,735 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:16,735 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588010725] [2021-11-02 23:17:16,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:16,735 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:16,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:16,824 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:16,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:16,833 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:16,833 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:16,833 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588010725] [2021-11-02 23:17:16,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [588010725] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:17:16,834 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:17:16,834 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-02 23:17:16,834 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755364743] [2021-11-02 23:17:16,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 23:17:16,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:16,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 23:17:16,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-02 23:17:16,836 INFO L87 Difference]: Start difference. First operand 112 states and 125 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:17,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:17,400 INFO L93 Difference]: Finished difference Result 140 states and 167 transitions. [2021-11-02 23:17:17,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 23:17:17,401 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-11-02 23:17:17,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:17,404 INFO L225 Difference]: With dead ends: 140 [2021-11-02 23:17:17,405 INFO L226 Difference]: Without dead ends: 140 [2021-11-02 23:17:17,405 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-02 23:17:17,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-02 23:17:17,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 134. [2021-11-02 23:17:17,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 73 states have (on average 1.6986301369863013) internal successors, (124), 109 states have internal predecessors, (124), 18 states have call successors, (18), 8 states have call predecessors, (18), 7 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-02 23:17:17,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 159 transitions. [2021-11-02 23:17:17,427 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 159 transitions. Word has length 14 [2021-11-02 23:17:17,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:17,428 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 159 transitions. [2021-11-02 23:17:17,428 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:17,428 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 159 transitions. [2021-11-02 23:17:17,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-02 23:17:17,429 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:17,429 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:17:17,429 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-02 23:17:17,430 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr9REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:17,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:17,445 INFO L85 PathProgramCache]: Analyzing trace with hash -825337291, now seen corresponding path program 1 times [2021-11-02 23:17:17,445 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:17,445 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761008369] [2021-11-02 23:17:17,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:17,446 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:17,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:17,595 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:17,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:17,616 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:17,617 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:17,619 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761008369] [2021-11-02 23:17:17,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [761008369] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:17:17,620 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:17:17,620 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 23:17:17,620 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151382050] [2021-11-02 23:17:17,622 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 23:17:17,622 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:17,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 23:17:17,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-02 23:17:17,624 INFO L87 Difference]: Start difference. First operand 134 states and 159 transitions. Second operand has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:17,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:17,977 INFO L93 Difference]: Finished difference Result 133 states and 157 transitions. [2021-11-02 23:17:17,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 23:17:17,978 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-11-02 23:17:17,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:17,982 INFO L225 Difference]: With dead ends: 133 [2021-11-02 23:17:17,982 INFO L226 Difference]: Without dead ends: 133 [2021-11-02 23:17:17,982 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-02 23:17:17,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-02 23:17:17,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2021-11-02 23:17:17,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 73 states have (on average 1.6712328767123288) internal successors, (122), 108 states have internal predecessors, (122), 18 states have call successors, (18), 8 states have call predecessors, (18), 7 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-02 23:17:17,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 157 transitions. [2021-11-02 23:17:17,992 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 157 transitions. Word has length 14 [2021-11-02 23:17:17,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:17,992 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 157 transitions. [2021-11-02 23:17:17,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:17,992 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 157 transitions. [2021-11-02 23:17:17,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-02 23:17:17,993 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:17,993 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:17:17,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-02 23:17:17,994 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr8REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:17,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:17,994 INFO L85 PathProgramCache]: Analyzing trace with hash -825337292, now seen corresponding path program 1 times [2021-11-02 23:17:17,994 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:17,995 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530655491] [2021-11-02 23:17:17,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:17,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:18,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:18,082 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:18,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:18,089 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:18,089 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:18,089 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530655491] [2021-11-02 23:17:18,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1530655491] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:17:18,090 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:17:18,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-02 23:17:18,090 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091147644] [2021-11-02 23:17:18,091 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 23:17:18,091 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:18,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 23:17:18,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-02 23:17:18,092 INFO L87 Difference]: Start difference. First operand 133 states and 157 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:18,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:18,437 INFO L93 Difference]: Finished difference Result 132 states and 155 transitions. [2021-11-02 23:17:18,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 23:17:18,438 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-11-02 23:17:18,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:18,440 INFO L225 Difference]: With dead ends: 132 [2021-11-02 23:17:18,440 INFO L226 Difference]: Without dead ends: 132 [2021-11-02 23:17:18,440 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-02 23:17:18,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-02 23:17:18,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2021-11-02 23:17:18,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 73 states have (on average 1.643835616438356) internal successors, (120), 107 states have internal predecessors, (120), 18 states have call successors, (18), 8 states have call predecessors, (18), 7 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-02 23:17:18,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 155 transitions. [2021-11-02 23:17:18,454 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 155 transitions. Word has length 14 [2021-11-02 23:17:18,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:18,454 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 155 transitions. [2021-11-02 23:17:18,455 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:18,455 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 155 transitions. [2021-11-02 23:17:18,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-02 23:17:18,457 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:18,457 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:17:18,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-02 23:17:18,457 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting is_list_containing_xErr1REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:18,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:18,458 INFO L85 PathProgramCache]: Analyzing trace with hash 1088244142, now seen corresponding path program 1 times [2021-11-02 23:17:18,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:18,459 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [463238714] [2021-11-02 23:17:18,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:18,459 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:18,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:18,608 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:18,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:18,623 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:18,623 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:18,623 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [463238714] [2021-11-02 23:17:18,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [463238714] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:17:18,624 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [7542811] [2021-11-02 23:17:18,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:18,624 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:17:18,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:17:18,643 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:17:18,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-02 23:17:18,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:18,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-02 23:17:18,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:17:18,958 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 23:17:18,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 18 [2021-11-02 23:17:19,393 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:19,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [7542811] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:17:19,394 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 23:17:19,394 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [7] total 12 [2021-11-02 23:17:19,394 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006646630] [2021-11-02 23:17:19,395 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 23:17:19,395 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:19,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 23:17:19,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-11-02 23:17:19,397 INFO L87 Difference]: Start difference. First operand 132 states and 155 transitions. Second operand has 9 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:20,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:20,030 INFO L93 Difference]: Finished difference Result 162 states and 200 transitions. [2021-11-02 23:17:20,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 23:17:20,031 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-11-02 23:17:20,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:20,034 INFO L225 Difference]: With dead ends: 162 [2021-11-02 23:17:20,034 INFO L226 Difference]: Without dead ends: 162 [2021-11-02 23:17:20,034 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2021-11-02 23:17:20,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-11-02 23:17:20,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 141. [2021-11-02 23:17:20,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 80 states have (on average 1.6375) internal successors, (131), 114 states have internal predecessors, (131), 19 states have call successors, (19), 9 states have call predecessors, (19), 8 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-02 23:17:20,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 168 transitions. [2021-11-02 23:17:20,045 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 168 transitions. Word has length 20 [2021-11-02 23:17:20,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:20,045 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 168 transitions. [2021-11-02 23:17:20,045 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:20,046 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 168 transitions. [2021-11-02 23:17:20,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-02 23:17:20,047 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:20,047 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:17:20,095 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-02 23:17:20,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-02 23:17:20,275 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting is_list_containing_xErr0REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:20,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:20,276 INFO L85 PathProgramCache]: Analyzing trace with hash 1088244141, now seen corresponding path program 1 times [2021-11-02 23:17:20,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:20,276 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886787269] [2021-11-02 23:17:20,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:20,277 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:20,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:20,372 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:20,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:20,379 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:20,379 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:20,379 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886787269] [2021-11-02 23:17:20,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1886787269] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:17:20,380 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [279194217] [2021-11-02 23:17:20,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:20,380 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:17:20,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:17:20,387 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:17:20,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-02 23:17:20,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:20,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-02 23:17:20,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:17:20,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 23:17:20,653 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 23:17:20,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2021-11-02 23:17:20,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:20,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [279194217] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:17:20,941 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 23:17:20,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [6] total 12 [2021-11-02 23:17:20,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284879776] [2021-11-02 23:17:20,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 23:17:20,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:20,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 23:17:20,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-02 23:17:20,943 INFO L87 Difference]: Start difference. First operand 141 states and 168 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:21,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:21,565 INFO L93 Difference]: Finished difference Result 158 states and 195 transitions. [2021-11-02 23:17:21,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 23:17:21,566 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-11-02 23:17:21,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:21,568 INFO L225 Difference]: With dead ends: 158 [2021-11-02 23:17:21,568 INFO L226 Difference]: Without dead ends: 158 [2021-11-02 23:17:21,569 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-11-02 23:17:21,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-11-02 23:17:21,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 141. [2021-11-02 23:17:21,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 80 states have (on average 1.6125) internal successors, (129), 114 states have internal predecessors, (129), 19 states have call successors, (19), 9 states have call predecessors, (19), 8 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-02 23:17:21,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 166 transitions. [2021-11-02 23:17:21,580 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 166 transitions. Word has length 20 [2021-11-02 23:17:21,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:21,580 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 166 transitions. [2021-11-02 23:17:21,580 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:21,580 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 166 transitions. [2021-11-02 23:17:21,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-02 23:17:21,584 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:21,584 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] [2021-11-02 23:17:21,628 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-02 23:17:21,803 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:17:21,803 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting removeErr0REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:21,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:21,804 INFO L85 PathProgramCache]: Analyzing trace with hash 665063432, now seen corresponding path program 1 times [2021-11-02 23:17:21,804 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:21,804 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997266241] [2021-11-02 23:17:21,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:21,804 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:21,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:21,898 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:21,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:21,906 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 23:17:21,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:21,915 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 23:17:21,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:21,923 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:21,924 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:21,924 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1997266241] [2021-11-02 23:17:21,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1997266241] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:17:21,924 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:17:21,925 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 23:17:21,925 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120650707] [2021-11-02 23:17:21,925 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 23:17:21,926 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:21,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 23:17:21,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-02 23:17:21,927 INFO L87 Difference]: Start difference. First operand 141 states and 166 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 23:17:22,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:22,590 INFO L93 Difference]: Finished difference Result 163 states and 190 transitions. [2021-11-02 23:17:22,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 23:17:22,591 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 24 [2021-11-02 23:17:22,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:22,593 INFO L225 Difference]: With dead ends: 163 [2021-11-02 23:17:22,593 INFO L226 Difference]: Without dead ends: 163 [2021-11-02 23:17:22,594 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-11-02 23:17:22,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-11-02 23:17:22,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 151. [2021-11-02 23:17:22,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 94 states have (on average 1.5957446808510638) internal successors, (150), 123 states have internal predecessors, (150), 19 states have call successors, (19), 10 states have call predecessors, (19), 9 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-02 23:17:22,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 187 transitions. [2021-11-02 23:17:22,606 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 187 transitions. Word has length 24 [2021-11-02 23:17:22,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:22,607 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 187 transitions. [2021-11-02 23:17:22,608 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 23:17:22,608 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 187 transitions. [2021-11-02 23:17:22,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-02 23:17:22,615 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:22,615 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] [2021-11-02 23:17:22,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-02 23:17:22,616 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting removeErr1REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:22,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:22,616 INFO L85 PathProgramCache]: Analyzing trace with hash 665063433, now seen corresponding path program 1 times [2021-11-02 23:17:22,617 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:22,619 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687233496] [2021-11-02 23:17:22,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:22,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:22,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:22,798 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:22,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:22,818 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 23:17:22,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:22,828 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 23:17:22,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:22,839 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:22,839 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:22,840 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687233496] [2021-11-02 23:17:22,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1687233496] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:17:22,841 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:17:22,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 23:17:22,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961733116] [2021-11-02 23:17:22,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 23:17:22,843 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:22,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 23:17:22,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-02 23:17:22,844 INFO L87 Difference]: Start difference. First operand 151 states and 187 transitions. Second operand has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 23:17:23,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:23,599 INFO L93 Difference]: Finished difference Result 159 states and 185 transitions. [2021-11-02 23:17:23,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 23:17:23,600 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 24 [2021-11-02 23:17:23,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:23,602 INFO L225 Difference]: With dead ends: 159 [2021-11-02 23:17:23,602 INFO L226 Difference]: Without dead ends: 159 [2021-11-02 23:17:23,602 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-02 23:17:23,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-11-02 23:17:23,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 151. [2021-11-02 23:17:23,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 94 states have (on average 1.5319148936170213) internal successors, (144), 123 states have internal predecessors, (144), 19 states have call successors, (19), 10 states have call predecessors, (19), 9 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-02 23:17:23,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 181 transitions. [2021-11-02 23:17:23,616 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 181 transitions. Word has length 24 [2021-11-02 23:17:23,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:23,616 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 181 transitions. [2021-11-02 23:17:23,617 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 23:17:23,617 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 181 transitions. [2021-11-02 23:17:23,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-02 23:17:23,618 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:23,618 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:17:23,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-02 23:17:23,619 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting is_list_containing_xErr1REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:23,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:23,619 INFO L85 PathProgramCache]: Analyzing trace with hash -1165108291, now seen corresponding path program 1 times [2021-11-02 23:17:23,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:23,620 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [175345090] [2021-11-02 23:17:23,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:23,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:23,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:24,046 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:24,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:24,056 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:24,057 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:24,057 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [175345090] [2021-11-02 23:17:24,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [175345090] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:17:24,057 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2114740210] [2021-11-02 23:17:24,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:24,058 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:17:24,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:17:24,059 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:17:24,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-02 23:17:24,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:24,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-02 23:17:24,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:17:24,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-02 23:17:24,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-02 23:17:24,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 21 [2021-11-02 23:17:24,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 10 [2021-11-02 23:17:24,785 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:24,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2114740210] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:17:24,785 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:17:24,786 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12] total 18 [2021-11-02 23:17:24,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745205483] [2021-11-02 23:17:24,787 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-02 23:17:24,788 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:24,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-02 23:17:24,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2021-11-02 23:17:24,790 INFO L87 Difference]: Start difference. First operand 151 states and 181 transitions. Second operand has 18 states, 16 states have (on average 1.6875) internal successors, (27), 14 states have internal predecessors, (27), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:26,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:26,553 INFO L93 Difference]: Finished difference Result 205 states and 265 transitions. [2021-11-02 23:17:26,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-02 23:17:26,554 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 1.6875) internal successors, (27), 14 states have internal predecessors, (27), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-11-02 23:17:26,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:26,556 INFO L225 Difference]: With dead ends: 205 [2021-11-02 23:17:26,557 INFO L226 Difference]: Without dead ends: 205 [2021-11-02 23:17:26,558 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=123, Invalid=689, Unknown=0, NotChecked=0, Total=812 [2021-11-02 23:17:26,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-11-02 23:17:26,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 167. [2021-11-02 23:17:26,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 106 states have (on average 1.509433962264151) internal successors, (160), 136 states have internal predecessors, (160), 21 states have call successors, (21), 12 states have call predecessors, (21), 11 states have return successors, (20), 18 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-02 23:17:26,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 201 transitions. [2021-11-02 23:17:26,571 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 201 transitions. Word has length 26 [2021-11-02 23:17:26,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:26,572 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 201 transitions. [2021-11-02 23:17:26,572 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 1.6875) internal successors, (27), 14 states have internal predecessors, (27), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:26,572 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 201 transitions. [2021-11-02 23:17:26,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-02 23:17:26,573 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:26,574 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] [2021-11-02 23:17:26,618 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-02 23:17:26,799 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-02 23:17:26,799 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting removeErr7REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:26,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:26,800 INFO L85 PathProgramCache]: Analyzing trace with hash -1748654451, now seen corresponding path program 1 times [2021-11-02 23:17:26,800 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:26,800 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [143467529] [2021-11-02 23:17:26,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:26,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:26,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:26,997 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:26,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:27,008 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 23:17:27,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:27,019 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 23:17:27,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:27,028 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:27,028 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:27,028 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [143467529] [2021-11-02 23:17:27,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [143467529] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:17:27,029 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:17:27,029 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-02 23:17:27,032 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651030441] [2021-11-02 23:17:27,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 23:17:27,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:27,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 23:17:27,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-02 23:17:27,035 INFO L87 Difference]: Start difference. First operand 167 states and 201 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 8 states have internal predecessors, (20), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 23:17:27,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:27,767 INFO L93 Difference]: Finished difference Result 193 states and 237 transitions. [2021-11-02 23:17:27,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 23:17:27,768 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 8 states have internal predecessors, (20), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 28 [2021-11-02 23:17:27,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:27,770 INFO L225 Difference]: With dead ends: 193 [2021-11-02 23:17:27,770 INFO L226 Difference]: Without dead ends: 193 [2021-11-02 23:17:27,771 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-11-02 23:17:27,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-11-02 23:17:27,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 180. [2021-11-02 23:17:27,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 115 states have (on average 1.4956521739130435) internal successors, (172), 146 states have internal predecessors, (172), 24 states have call successors, (24), 13 states have call predecessors, (24), 12 states have return successors, (24), 20 states have call predecessors, (24), 23 states have call successors, (24) [2021-11-02 23:17:27,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 220 transitions. [2021-11-02 23:17:27,782 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 220 transitions. Word has length 28 [2021-11-02 23:17:27,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:27,782 INFO L470 AbstractCegarLoop]: Abstraction has 180 states and 220 transitions. [2021-11-02 23:17:27,782 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 8 states have internal predecessors, (20), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 23:17:27,783 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 220 transitions. [2021-11-02 23:17:27,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-02 23:17:27,784 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:27,784 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:17:27,784 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-02 23:17:27,797 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting removeErr14REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:27,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:27,798 INFO L85 PathProgramCache]: Analyzing trace with hash -768696082, now seen corresponding path program 1 times [2021-11-02 23:17:27,798 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:27,799 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111591069] [2021-11-02 23:17:27,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:27,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:27,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:27,952 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:27,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:27,958 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 23:17:27,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:27,966 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 23:17:27,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:27,976 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:27,976 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:27,980 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111591069] [2021-11-02 23:17:27,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2111591069] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:17:27,981 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:17:27,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-02 23:17:27,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797523894] [2021-11-02 23:17:27,983 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 23:17:27,983 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:27,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 23:17:27,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-02 23:17:27,984 INFO L87 Difference]: Start difference. First operand 180 states and 220 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 7 states have internal predecessors, (22), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 23:17:28,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:28,615 INFO L93 Difference]: Finished difference Result 188 states and 230 transitions. [2021-11-02 23:17:28,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 23:17:28,616 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 7 states have internal predecessors, (22), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 30 [2021-11-02 23:17:28,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:28,618 INFO L225 Difference]: With dead ends: 188 [2021-11-02 23:17:28,618 INFO L226 Difference]: Without dead ends: 188 [2021-11-02 23:17:28,619 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-02 23:17:28,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-11-02 23:17:28,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 180. [2021-11-02 23:17:28,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 115 states have (on average 1.4869565217391305) internal successors, (171), 146 states have internal predecessors, (171), 24 states have call successors, (24), 13 states have call predecessors, (24), 12 states have return successors, (23), 20 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-02 23:17:28,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 218 transitions. [2021-11-02 23:17:28,632 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 218 transitions. Word has length 30 [2021-11-02 23:17:28,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:28,633 INFO L470 AbstractCegarLoop]: Abstraction has 180 states and 218 transitions. [2021-11-02 23:17:28,633 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 7 states have internal predecessors, (22), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 23:17:28,633 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 218 transitions. [2021-11-02 23:17:28,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-02 23:17:28,638 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:28,638 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:17:28,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-02 23:17:28,639 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting removeErr0REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:28,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:28,639 INFO L85 PathProgramCache]: Analyzing trace with hash -534694181, now seen corresponding path program 1 times [2021-11-02 23:17:28,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:28,640 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1865930278] [2021-11-02 23:17:28,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:28,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:28,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:28,729 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:28,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:28,734 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-02 23:17:28,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:28,761 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 23:17:28,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:28,765 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:28,766 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:28,766 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1865930278] [2021-11-02 23:17:28,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1865930278] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:17:28,766 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1809168068] [2021-11-02 23:17:28,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:28,767 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:17:28,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:17:28,768 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:17:28,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-02 23:17:28,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:29,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-02 23:17:29,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:17:29,210 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:29,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1809168068] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:17:29,211 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:17:29,211 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2021-11-02 23:17:29,211 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689441006] [2021-11-02 23:17:29,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-02 23:17:29,213 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:29,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-02 23:17:29,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2021-11-02 23:17:29,214 INFO L87 Difference]: Start difference. First operand 180 states and 218 transitions. Second operand has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (5), 2 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 23:17:30,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:30,235 INFO L93 Difference]: Finished difference Result 202 states and 249 transitions. [2021-11-02 23:17:30,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 23:17:30,235 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (5), 2 states have call predecessors, (5), 4 states have call successors, (5) Word has length 30 [2021-11-02 23:17:30,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:30,238 INFO L225 Difference]: With dead ends: 202 [2021-11-02 23:17:30,238 INFO L226 Difference]: Without dead ends: 198 [2021-11-02 23:17:30,238 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-11-02 23:17:30,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-11-02 23:17:30,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 180. [2021-11-02 23:17:30,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 115 states have (on average 1.4695652173913043) internal successors, (169), 146 states have internal predecessors, (169), 24 states have call successors, (24), 13 states have call predecessors, (24), 12 states have return successors, (23), 20 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-02 23:17:30,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 216 transitions. [2021-11-02 23:17:30,249 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 216 transitions. Word has length 30 [2021-11-02 23:17:30,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:30,249 INFO L470 AbstractCegarLoop]: Abstraction has 180 states and 216 transitions. [2021-11-02 23:17:30,250 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (5), 2 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 23:17:30,250 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 216 transitions. [2021-11-02 23:17:30,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-02 23:17:30,251 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:30,251 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] [2021-11-02 23:17:30,297 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-02 23:17:30,479 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:17:30,479 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting removeErr0REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:30,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:30,479 INFO L85 PathProgramCache]: Analyzing trace with hash 1974455823, now seen corresponding path program 1 times [2021-11-02 23:17:30,479 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:30,480 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [660107902] [2021-11-02 23:17:30,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:30,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:30,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:30,560 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:30,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:30,565 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-02 23:17:30,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:30,572 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-02 23:17:30,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:30,576 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:30,576 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:30,577 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [660107902] [2021-11-02 23:17:30,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [660107902] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:17:30,577 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:17:30,577 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-02 23:17:30,577 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119123547] [2021-11-02 23:17:30,578 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 23:17:30,578 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:30,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 23:17:30,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-02 23:17:30,579 INFO L87 Difference]: Start difference. First operand 180 states and 216 transitions. Second operand has 7 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 23:17:31,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:31,189 INFO L93 Difference]: Finished difference Result 199 states and 241 transitions. [2021-11-02 23:17:31,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 23:17:31,190 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 32 [2021-11-02 23:17:31,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:31,192 INFO L225 Difference]: With dead ends: 199 [2021-11-02 23:17:31,192 INFO L226 Difference]: Without dead ends: 199 [2021-11-02 23:17:31,193 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-11-02 23:17:31,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-11-02 23:17:31,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 179. [2021-11-02 23:17:31,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 115 states have (on average 1.4608695652173913) internal successors, (168), 145 states have internal predecessors, (168), 24 states have call successors, (24), 13 states have call predecessors, (24), 12 states have return successors, (23), 20 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-02 23:17:31,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 215 transitions. [2021-11-02 23:17:31,203 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 215 transitions. Word has length 32 [2021-11-02 23:17:31,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:31,204 INFO L470 AbstractCegarLoop]: Abstraction has 179 states and 215 transitions. [2021-11-02 23:17:31,204 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 23:17:31,204 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 215 transitions. [2021-11-02 23:17:31,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-02 23:17:31,205 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:31,205 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] [2021-11-02 23:17:31,206 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-02 23:17:31,206 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting removeErr1REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:31,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:31,207 INFO L85 PathProgramCache]: Analyzing trace with hash 1974455824, now seen corresponding path program 1 times [2021-11-02 23:17:31,207 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:31,207 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197870388] [2021-11-02 23:17:31,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:31,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:31,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:31,312 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:31,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:31,320 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-02 23:17:31,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:31,329 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-02 23:17:31,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:31,335 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:31,336 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:31,336 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197870388] [2021-11-02 23:17:31,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1197870388] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:17:31,336 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:17:31,337 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-02 23:17:31,337 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928564916] [2021-11-02 23:17:31,337 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 23:17:31,338 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:31,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 23:17:31,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-02 23:17:31,339 INFO L87 Difference]: Start difference. First operand 179 states and 215 transitions. Second operand has 7 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 23:17:31,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:31,973 INFO L93 Difference]: Finished difference Result 197 states and 237 transitions. [2021-11-02 23:17:31,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 23:17:31,973 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 32 [2021-11-02 23:17:31,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:31,975 INFO L225 Difference]: With dead ends: 197 [2021-11-02 23:17:31,975 INFO L226 Difference]: Without dead ends: 197 [2021-11-02 23:17:31,976 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-02 23:17:31,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-11-02 23:17:31,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 173. [2021-11-02 23:17:31,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 115 states have (on average 1.4086956521739131) internal successors, (162), 139 states have internal predecessors, (162), 24 states have call successors, (24), 13 states have call predecessors, (24), 12 states have return successors, (23), 20 states have call predecessors, (23), 23 states have call successors, (23) [2021-11-02 23:17:31,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 209 transitions. [2021-11-02 23:17:31,985 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 209 transitions. Word has length 32 [2021-11-02 23:17:31,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:31,985 INFO L470 AbstractCegarLoop]: Abstraction has 173 states and 209 transitions. [2021-11-02 23:17:31,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 23:17:31,986 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 209 transitions. [2021-11-02 23:17:31,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-02 23:17:31,987 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:31,987 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] [2021-11-02 23:17:31,987 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-02 23:17:31,987 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting is_list_containing_xErr1REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:31,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:31,988 INFO L85 PathProgramCache]: Analyzing trace with hash 1472193678, now seen corresponding path program 1 times [2021-11-02 23:17:31,988 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:31,988 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1195545770] [2021-11-02 23:17:31,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:31,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:32,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:32,306 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:32,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:32,312 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:32,312 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:32,312 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1195545770] [2021-11-02 23:17:32,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1195545770] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:17:32,313 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1423643863] [2021-11-02 23:17:32,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:32,313 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:17:32,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:17:32,314 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:17:32,342 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-02 23:17:32,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:32,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-02 23:17:32,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:17:32,895 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 33 [2021-11-02 23:17:32,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2021-11-02 23:17:33,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 29 [2021-11-02 23:17:33,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 14 [2021-11-02 23:17:33,249 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:33,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1423643863] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:17:33,249 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:17:33,250 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 21 [2021-11-02 23:17:33,250 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394464387] [2021-11-02 23:17:33,252 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-02 23:17:33,253 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:33,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-02 23:17:33,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=395, Unknown=0, NotChecked=0, Total=462 [2021-11-02 23:17:33,254 INFO L87 Difference]: Start difference. First operand 173 states and 209 transitions. Second operand has 22 states, 19 states have (on average 2.263157894736842) internal successors, (43), 17 states have internal predecessors, (43), 5 states have call successors, (7), 6 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:34,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:34,642 INFO L93 Difference]: Finished difference Result 213 states and 260 transitions. [2021-11-02 23:17:34,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 23:17:34,647 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 19 states have (on average 2.263157894736842) internal successors, (43), 17 states have internal predecessors, (43), 5 states have call successors, (7), 6 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-11-02 23:17:34,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:34,649 INFO L225 Difference]: With dead ends: 213 [2021-11-02 23:17:34,649 INFO L226 Difference]: Without dead ends: 213 [2021-11-02 23:17:34,649 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=127, Invalid=685, Unknown=0, NotChecked=0, Total=812 [2021-11-02 23:17:34,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-11-02 23:17:34,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 195. [2021-11-02 23:17:34,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 132 states have (on average 1.393939393939394) internal successors, (184), 156 states have internal predecessors, (184), 26 states have call successors, (26), 16 states have call predecessors, (26), 15 states have return successors, (25), 22 states have call predecessors, (25), 25 states have call successors, (25) [2021-11-02 23:17:34,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 235 transitions. [2021-11-02 23:17:34,665 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 235 transitions. Word has length 32 [2021-11-02 23:17:34,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:34,667 INFO L470 AbstractCegarLoop]: Abstraction has 195 states and 235 transitions. [2021-11-02 23:17:34,667 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 19 states have (on average 2.263157894736842) internal successors, (43), 17 states have internal predecessors, (43), 5 states have call successors, (7), 6 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:34,667 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 235 transitions. [2021-11-02 23:17:34,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-02 23:17:34,669 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:34,669 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] [2021-11-02 23:17:34,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-02 23:17:34,882 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-02 23:17:34,883 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting is_list_containing_xErr0REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:34,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:34,884 INFO L85 PathProgramCache]: Analyzing trace with hash 1472193677, now seen corresponding path program 1 times [2021-11-02 23:17:34,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:34,884 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1486674653] [2021-11-02 23:17:34,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:34,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:34,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:35,077 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:35,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:35,090 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 23:17:35,090 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:35,090 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1486674653] [2021-11-02 23:17:35,092 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1486674653] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:17:35,092 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [110176678] [2021-11-02 23:17:35,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:35,093 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:17:35,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:17:35,099 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:17:35,121 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-02 23:17:35,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:35,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-02 23:17:35,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:17:35,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 23:17:35,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-11-02 23:17:35,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 9 [2021-11-02 23:17:35,701 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 23:17:35,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [110176678] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:17:35,702 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:17:35,702 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 16 [2021-11-02 23:17:35,702 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720997982] [2021-11-02 23:17:35,704 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-02 23:17:35,704 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:35,705 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-02 23:17:35,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2021-11-02 23:17:35,705 INFO L87 Difference]: Start difference. First operand 195 states and 235 transitions. Second operand has 17 states, 15 states have (on average 3.2) internal successors, (48), 13 states have internal predecessors, (48), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:36,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:36,888 INFO L93 Difference]: Finished difference Result 212 states and 261 transitions. [2021-11-02 23:17:36,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-02 23:17:36,889 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 3.2) internal successors, (48), 13 states have internal predecessors, (48), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-11-02 23:17:36,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:36,891 INFO L225 Difference]: With dead ends: 212 [2021-11-02 23:17:36,891 INFO L226 Difference]: Without dead ends: 212 [2021-11-02 23:17:36,892 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2021-11-02 23:17:36,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-11-02 23:17:36,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 194. [2021-11-02 23:17:36,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 132 states have (on average 1.371212121212121) internal successors, (181), 155 states have internal predecessors, (181), 26 states have call successors, (26), 16 states have call predecessors, (26), 15 states have return successors, (25), 22 states have call predecessors, (25), 25 states have call successors, (25) [2021-11-02 23:17:36,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 232 transitions. [2021-11-02 23:17:36,914 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 232 transitions. Word has length 32 [2021-11-02 23:17:36,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:36,914 INFO L470 AbstractCegarLoop]: Abstraction has 194 states and 232 transitions. [2021-11-02 23:17:36,915 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 3.2) internal successors, (48), 13 states have internal predecessors, (48), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:17:36,915 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 232 transitions. [2021-11-02 23:17:36,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-02 23:17:36,916 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:36,916 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] [2021-11-02 23:17:36,959 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-02 23:17:37,139 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:17:37,139 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONMEMORY_LEAK === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:37,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:37,140 INFO L85 PathProgramCache]: Analyzing trace with hash 928406994, now seen corresponding path program 1 times [2021-11-02 23:17:37,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:37,140 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618291638] [2021-11-02 23:17:37,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:37,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:37,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:37,250 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:37,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:37,256 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 23:17:37,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:37,261 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 23:17:37,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:37,278 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 23:17:37,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:37,290 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:37,290 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:37,291 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618291638] [2021-11-02 23:17:37,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [618291638] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:17:37,291 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:17:37,291 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 23:17:37,292 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160548565] [2021-11-02 23:17:37,292 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 23:17:37,293 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:37,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 23:17:37,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-02 23:17:37,297 INFO L87 Difference]: Start difference. First operand 194 states and 232 transitions. Second operand has 7 states, 6 states have (on average 4.166666666666667) internal successors, (25), 4 states have internal predecessors, (25), 2 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-02 23:17:37,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:37,809 INFO L93 Difference]: Finished difference Result 230 states and 275 transitions. [2021-11-02 23:17:37,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 23:17:37,810 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.166666666666667) internal successors, (25), 4 states have internal predecessors, (25), 2 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 35 [2021-11-02 23:17:37,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:37,812 INFO L225 Difference]: With dead ends: 230 [2021-11-02 23:17:37,812 INFO L226 Difference]: Without dead ends: 230 [2021-11-02 23:17:37,813 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2021-11-02 23:17:37,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-11-02 23:17:37,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 200. [2021-11-02 23:17:37,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 135 states have (on average 1.362962962962963) internal successors, (184), 160 states have internal predecessors, (184), 28 states have call successors, (28), 17 states have call predecessors, (28), 16 states have return successors, (27), 22 states have call predecessors, (27), 27 states have call successors, (27) [2021-11-02 23:17:37,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 239 transitions. [2021-11-02 23:17:37,823 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 239 transitions. Word has length 35 [2021-11-02 23:17:37,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:37,823 INFO L470 AbstractCegarLoop]: Abstraction has 200 states and 239 transitions. [2021-11-02 23:17:37,823 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.166666666666667) internal successors, (25), 4 states have internal predecessors, (25), 2 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-02 23:17:37,824 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 239 transitions. [2021-11-02 23:17:37,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-02 23:17:37,824 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:37,825 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:17:37,825 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-02 23:17:37,825 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting removeErr7REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:37,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:37,826 INFO L85 PathProgramCache]: Analyzing trace with hash -1138698082, now seen corresponding path program 1 times [2021-11-02 23:17:37,826 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:37,826 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771923934] [2021-11-02 23:17:37,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:37,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:37,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:38,624 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:38,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:38,629 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-02 23:17:38,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:38,637 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 23:17:38,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:38,643 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:38,644 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:38,644 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771923934] [2021-11-02 23:17:38,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771923934] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:17:38,644 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1102753498] [2021-11-02 23:17:38,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:38,645 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:17:38,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:17:38,646 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:17:38,670 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-02 23:17:38,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:38,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-02 23:17:38,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:17:39,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 39 [2021-11-02 23:17:39,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 38 [2021-11-02 23:17:39,957 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 23:17:39,957 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 53 treesize of output 53 [2021-11-02 23:17:39,972 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 23:17:39,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 44 [2021-11-02 23:17:40,270 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:40,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1102753498] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:17:40,270 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:17:40,271 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 11] total 26 [2021-11-02 23:17:40,271 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880306774] [2021-11-02 23:17:40,271 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-02 23:17:40,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:40,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-02 23:17:40,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=621, Unknown=0, NotChecked=0, Total=702 [2021-11-02 23:17:40,273 INFO L87 Difference]: Start difference. First operand 200 states and 239 transitions. Second operand has 27 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 24 states have internal predecessors, (51), 4 states have call successors, (9), 5 states have call predecessors, (9), 2 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 23:17:49,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:49,160 INFO L93 Difference]: Finished difference Result 368 states and 432 transitions. [2021-11-02 23:17:49,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-02 23:17:49,160 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 24 states have internal predecessors, (51), 4 states have call successors, (9), 5 states have call predecessors, (9), 2 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 34 [2021-11-02 23:17:49,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:49,163 INFO L225 Difference]: With dead ends: 368 [2021-11-02 23:17:49,163 INFO L226 Difference]: Without dead ends: 368 [2021-11-02 23:17:49,165 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 27 SyntacticMatches, 4 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=304, Invalid=1765, Unknown=1, NotChecked=0, Total=2070 [2021-11-02 23:17:49,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 368 states. [2021-11-02 23:17:49,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 368 to 298. [2021-11-02 23:17:49,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 201 states have (on average 1.3333333333333333) internal successors, (268), 231 states have internal predecessors, (268), 48 states have call successors, (48), 28 states have call predecessors, (48), 28 states have return successors, (51), 38 states have call predecessors, (51), 47 states have call successors, (51) [2021-11-02 23:17:49,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 367 transitions. [2021-11-02 23:17:49,182 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 367 transitions. Word has length 34 [2021-11-02 23:17:49,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:49,183 INFO L470 AbstractCegarLoop]: Abstraction has 298 states and 367 transitions. [2021-11-02 23:17:49,183 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 24 states have internal predecessors, (51), 4 states have call successors, (9), 5 states have call predecessors, (9), 2 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 23:17:49,183 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 367 transitions. [2021-11-02 23:17:49,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-02 23:17:49,184 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:49,185 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:17:49,233 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-02 23:17:49,411 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-02 23:17:49,411 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting removeErr6REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:49,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:49,411 INFO L85 PathProgramCache]: Analyzing trace with hash -1138698083, now seen corresponding path program 1 times [2021-11-02 23:17:49,412 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:49,412 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278801000] [2021-11-02 23:17:49,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:49,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:49,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:50,109 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:50,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:50,115 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-02 23:17:50,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:50,126 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 23:17:50,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:50,132 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:50,132 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:50,132 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278801000] [2021-11-02 23:17:50,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [278801000] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:17:50,133 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [873263875] [2021-11-02 23:17:50,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:50,133 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:17:50,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:17:50,139 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:17:50,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-02 23:17:50,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:50,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-02 23:17:50,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:17:50,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 23:17:50,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-02 23:17:51,309 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 23:17:51,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 27 [2021-11-02 23:17:51,416 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:51,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [873263875] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:17:51,417 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:17:51,417 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 10] total 25 [2021-11-02 23:17:51,417 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477091501] [2021-11-02 23:17:51,420 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-02 23:17:51,420 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:51,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-02 23:17:51,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=571, Unknown=0, NotChecked=0, Total=650 [2021-11-02 23:17:51,421 INFO L87 Difference]: Start difference. First operand 298 states and 367 transitions. Second operand has 26 states, 25 states have (on average 2.0) internal successors, (50), 23 states have internal predecessors, (50), 4 states have call successors, (9), 5 states have call predecessors, (9), 2 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 23:17:55,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:55,488 INFO L93 Difference]: Finished difference Result 463 states and 565 transitions. [2021-11-02 23:17:55,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-02 23:17:55,491 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.0) internal successors, (50), 23 states have internal predecessors, (50), 4 states have call successors, (9), 5 states have call predecessors, (9), 2 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 34 [2021-11-02 23:17:55,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:55,494 INFO L225 Difference]: With dead ends: 463 [2021-11-02 23:17:55,494 INFO L226 Difference]: Without dead ends: 463 [2021-11-02 23:17:55,495 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 29 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=299, Invalid=1681, Unknown=0, NotChecked=0, Total=1980 [2021-11-02 23:17:55,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2021-11-02 23:17:55,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 403. [2021-11-02 23:17:55,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 274 states have (on average 1.3394160583941606) internal successors, (367), 308 states have internal predecessors, (367), 66 states have call successors, (66), 41 states have call predecessors, (66), 42 states have return successors, (73), 53 states have call predecessors, (73), 65 states have call successors, (73) [2021-11-02 23:17:55,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 506 transitions. [2021-11-02 23:17:55,526 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 506 transitions. Word has length 34 [2021-11-02 23:17:55,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:55,527 INFO L470 AbstractCegarLoop]: Abstraction has 403 states and 506 transitions. [2021-11-02 23:17:55,527 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.0) internal successors, (50), 23 states have internal predecessors, (50), 4 states have call successors, (9), 5 states have call predecessors, (9), 2 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 23:17:55,527 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 506 transitions. [2021-11-02 23:17:55,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-02 23:17:55,529 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:55,529 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:17:55,578 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-02 23:17:55,755 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-02 23:17:55,755 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting removeErr7REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:55,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:55,755 INFO L85 PathProgramCache]: Analyzing trace with hash 1579485460, now seen corresponding path program 1 times [2021-11-02 23:17:55,756 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:55,756 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090600543] [2021-11-02 23:17:55,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:55,756 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:55,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:55,836 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:55,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:55,841 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-02 23:17:55,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:55,879 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-11-02 23:17:55,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:55,908 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 23:17:55,908 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:55,908 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2090600543] [2021-11-02 23:17:55,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2090600543] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:17:55,909 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:17:55,909 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 23:17:55,909 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109230812] [2021-11-02 23:17:55,910 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 23:17:55,910 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:17:55,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 23:17:55,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-02 23:17:55,912 INFO L87 Difference]: Start difference. First operand 403 states and 506 transitions. Second operand has 7 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 23:17:56,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:17:56,254 INFO L93 Difference]: Finished difference Result 428 states and 538 transitions. [2021-11-02 23:17:56,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 23:17:56,255 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 36 [2021-11-02 23:17:56,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:17:56,259 INFO L225 Difference]: With dead ends: 428 [2021-11-02 23:17:56,259 INFO L226 Difference]: Without dead ends: 417 [2021-11-02 23:17:56,260 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-02 23:17:56,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2021-11-02 23:17:56,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 403. [2021-11-02 23:17:56,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 274 states have (on average 1.3248175182481752) internal successors, (363), 308 states have internal predecessors, (363), 66 states have call successors, (66), 41 states have call predecessors, (66), 42 states have return successors, (73), 53 states have call predecessors, (73), 65 states have call successors, (73) [2021-11-02 23:17:56,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 502 transitions. [2021-11-02 23:17:56,283 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 502 transitions. Word has length 36 [2021-11-02 23:17:56,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:17:56,284 INFO L470 AbstractCegarLoop]: Abstraction has 403 states and 502 transitions. [2021-11-02 23:17:56,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 23:17:56,284 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 502 transitions. [2021-11-02 23:17:56,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-02 23:17:56,286 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:17:56,286 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:17:56,286 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-02 23:17:56,286 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting removeErr14REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:17:56,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:17:56,287 INFO L85 PathProgramCache]: Analyzing trace with hash 1283822271, now seen corresponding path program 1 times [2021-11-02 23:17:56,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:17:56,288 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337271064] [2021-11-02 23:17:56,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:56,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:17:56,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:56,727 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:17:56,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:56,733 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-02 23:17:56,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:56,742 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 23:17:56,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:56,751 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:17:56,752 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:17:56,752 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [337271064] [2021-11-02 23:17:56,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [337271064] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:17:56,753 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353494434] [2021-11-02 23:17:56,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:17:56,753 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:17:56,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:17:56,754 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:17:56,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-02 23:17:57,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:17:57,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-02 23:17:57,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:17:57,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 23:17:57,182 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-02 23:17:57,190 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-02 23:17:57,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 21 [2021-11-02 23:17:57,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:17:57,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:17:57,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 20 [2021-11-02 23:17:57,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 21 [2021-11-02 23:17:57,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:17:57,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:17:57,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 20 [2021-11-02 23:17:57,412 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-02 23:17:57,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-11-02 23:17:57,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-02 23:17:57,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-02 23:17:57,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:17:57,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 40 [2021-11-02 23:17:57,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:17:57,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 40 [2021-11-02 23:17:57,900 INFO L354 Elim1Store]: treesize reduction 126, result has 27.2 percent of original size [2021-11-02 23:17:57,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 93 treesize of output 119 [2021-11-02 23:17:57,956 INFO L354 Elim1Store]: treesize reduction 96, result has 23.2 percent of original size [2021-11-02 23:17:57,957 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 9 case distinctions, treesize of input 107 treesize of output 106 [2021-11-02 23:18:02,687 INFO L354 Elim1Store]: treesize reduction 106, result has 2.8 percent of original size [2021-11-02 23:18:02,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 147 treesize of output 105 [2021-11-02 23:18:03,163 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-02 23:18:03,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 75 treesize of output 34 [2021-11-02 23:18:03,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:18:03,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [353494434] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:18:03,250 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:18:03,251 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 26 [2021-11-02 23:18:03,251 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332138440] [2021-11-02 23:18:03,252 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-02 23:18:03,252 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:18:03,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-02 23:18:03,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=574, Unknown=0, NotChecked=0, Total=650 [2021-11-02 23:18:03,253 INFO L87 Difference]: Start difference. First operand 403 states and 502 transitions. Second operand has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 23 states have internal predecessors, (55), 4 states have call successors, (9), 5 states have call predecessors, (9), 2 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 23:18:19,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:18:19,240 INFO L93 Difference]: Finished difference Result 627 states and 779 transitions. [2021-11-02 23:18:19,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-02 23:18:19,240 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 23 states have internal predecessors, (55), 4 states have call successors, (9), 5 states have call predecessors, (9), 2 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 36 [2021-11-02 23:18:19,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:18:19,244 INFO L225 Difference]: With dead ends: 627 [2021-11-02 23:18:19,245 INFO L226 Difference]: Without dead ends: 627 [2021-11-02 23:18:19,246 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 27 SyntacticMatches, 5 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 361 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=246, Invalid=1473, Unknown=3, NotChecked=0, Total=1722 [2021-11-02 23:18:19,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 627 states. [2021-11-02 23:18:19,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 627 to 509. [2021-11-02 23:18:19,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 509 states, 348 states have (on average 1.3160919540229885) internal successors, (458), 386 states have internal predecessors, (458), 86 states have call successors, (86), 53 states have call predecessors, (86), 54 states have return successors, (98), 69 states have call predecessors, (98), 85 states have call successors, (98) [2021-11-02 23:18:19,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 509 states to 509 states and 642 transitions. [2021-11-02 23:18:19,276 INFO L78 Accepts]: Start accepts. Automaton has 509 states and 642 transitions. Word has length 36 [2021-11-02 23:18:19,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:18:19,276 INFO L470 AbstractCegarLoop]: Abstraction has 509 states and 642 transitions. [2021-11-02 23:18:19,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 23 states have internal predecessors, (55), 4 states have call successors, (9), 5 states have call predecessors, (9), 2 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 23:18:19,277 INFO L276 IsEmpty]: Start isEmpty. Operand 509 states and 642 transitions. [2021-11-02 23:18:19,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-02 23:18:19,278 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:18:19,279 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] [2021-11-02 23:18:19,327 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-02 23:18:19,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-02 23:18:19,500 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting re_insertErr0REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:18:19,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:18:19,500 INFO L85 PathProgramCache]: Analyzing trace with hash 598861143, now seen corresponding path program 1 times [2021-11-02 23:18:19,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:18:19,500 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1245250477] [2021-11-02 23:18:19,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:18:19,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:18:19,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:19,578 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:18:19,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:19,584 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 23:18:19,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:19,589 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 23:18:19,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:19,605 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 23:18:19,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:19,613 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-11-02 23:18:19,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:19,631 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:18:19,631 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:18:19,632 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1245250477] [2021-11-02 23:18:19,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1245250477] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:18:19,632 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:18:19,632 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 23:18:19,632 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568824106] [2021-11-02 23:18:19,650 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 23:18:19,651 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:18:19,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 23:18:19,652 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-02 23:18:19,652 INFO L87 Difference]: Start difference. First operand 509 states and 642 transitions. Second operand has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-02 23:18:20,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:18:20,485 INFO L93 Difference]: Finished difference Result 574 states and 715 transitions. [2021-11-02 23:18:20,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 23:18:20,486 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 40 [2021-11-02 23:18:20,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:18:20,490 INFO L225 Difference]: With dead ends: 574 [2021-11-02 23:18:20,491 INFO L226 Difference]: Without dead ends: 574 [2021-11-02 23:18:20,491 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2021-11-02 23:18:20,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 574 states. [2021-11-02 23:18:20,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 574 to 545. [2021-11-02 23:18:20,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 545 states, 381 states have (on average 1.3280839895013123) internal successors, (506), 419 states have internal predecessors, (506), 86 states have call successors, (86), 56 states have call predecessors, (86), 60 states have return successors, (101), 69 states have call predecessors, (101), 85 states have call successors, (101) [2021-11-02 23:18:20,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 545 states to 545 states and 693 transitions. [2021-11-02 23:18:20,535 INFO L78 Accepts]: Start accepts. Automaton has 545 states and 693 transitions. Word has length 40 [2021-11-02 23:18:20,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:18:20,536 INFO L470 AbstractCegarLoop]: Abstraction has 545 states and 693 transitions. [2021-11-02 23:18:20,537 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-02 23:18:20,537 INFO L276 IsEmpty]: Start isEmpty. Operand 545 states and 693 transitions. [2021-11-02 23:18:20,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-02 23:18:20,539 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:18:20,539 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] [2021-11-02 23:18:20,539 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-02 23:18:20,540 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting re_insertErr1REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:18:20,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:18:20,540 INFO L85 PathProgramCache]: Analyzing trace with hash 598861144, now seen corresponding path program 1 times [2021-11-02 23:18:20,540 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:18:20,541 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811904771] [2021-11-02 23:18:20,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:18:20,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:18:20,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:20,657 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:18:20,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:20,662 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 23:18:20,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:20,667 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 23:18:20,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:20,686 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 23:18:20,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:20,693 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-11-02 23:18:20,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:20,699 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:18:20,699 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:18:20,699 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811904771] [2021-11-02 23:18:20,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811904771] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:18:20,699 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:18:20,700 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 23:18:20,700 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104254167] [2021-11-02 23:18:20,700 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 23:18:20,700 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:18:20,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 23:18:20,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-02 23:18:20,702 INFO L87 Difference]: Start difference. First operand 545 states and 693 transitions. Second operand has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-02 23:18:21,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:18:21,503 INFO L93 Difference]: Finished difference Result 570 states and 704 transitions. [2021-11-02 23:18:21,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 23:18:21,504 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 40 [2021-11-02 23:18:21,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:18:21,508 INFO L225 Difference]: With dead ends: 570 [2021-11-02 23:18:21,508 INFO L226 Difference]: Without dead ends: 570 [2021-11-02 23:18:21,508 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2021-11-02 23:18:21,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 570 states. [2021-11-02 23:18:21,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 570 to 545. [2021-11-02 23:18:21,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 545 states, 381 states have (on average 1.2992125984251968) internal successors, (495), 419 states have internal predecessors, (495), 86 states have call successors, (86), 56 states have call predecessors, (86), 60 states have return successors, (101), 69 states have call predecessors, (101), 85 states have call successors, (101) [2021-11-02 23:18:21,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 545 states to 545 states and 682 transitions. [2021-11-02 23:18:21,532 INFO L78 Accepts]: Start accepts. Automaton has 545 states and 682 transitions. Word has length 40 [2021-11-02 23:18:21,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:18:21,533 INFO L470 AbstractCegarLoop]: Abstraction has 545 states and 682 transitions. [2021-11-02 23:18:21,533 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-02 23:18:21,533 INFO L276 IsEmpty]: Start isEmpty. Operand 545 states and 682 transitions. [2021-11-02 23:18:21,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-02 23:18:21,535 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:18:21,535 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:18:21,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-02 23:18:21,535 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting is_list_containing_xErr1REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:18:21,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:18:21,536 INFO L85 PathProgramCache]: Analyzing trace with hash 1762184861, now seen corresponding path program 2 times [2021-11-02 23:18:21,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:18:21,536 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43770636] [2021-11-02 23:18:21,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:18:21,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:18:21,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:22,018 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:18:22,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:22,035 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 13 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:18:22,035 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:18:22,035 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43770636] [2021-11-02 23:18:22,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [43770636] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:18:22,036 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [504048789] [2021-11-02 23:18:22,036 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 23:18:22,036 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:18:22,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:18:22,051 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:18:22,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-02 23:18:22,556 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 23:18:22,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 23:18:22,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-02 23:18:22,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:18:22,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 23:18:22,736 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-02 23:18:22,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-11-02 23:18:22,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-02 23:18:22,840 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-02 23:18:22,903 INFO L354 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2021-11-02 23:18:22,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 49 [2021-11-02 23:18:22,915 INFO L354 Elim1Store]: treesize reduction 47, result has 21.7 percent of original size [2021-11-02 23:18:22,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 61 treesize of output 60 [2021-11-02 23:18:23,458 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [is_list_containing_x_~l.offset, is_list_containing_x_~l.base] [2021-11-02 23:18:23,458 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-02 23:18:23,458 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-11-02 23:18:23,458 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922783664] [2021-11-02 23:18:23,459 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-02 23:18:23,459 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:18:23,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-02 23:18:23,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=622, Unknown=0, NotChecked=0, Total=702 [2021-11-02 23:18:23,460 INFO L87 Difference]: Start difference. First operand 545 states and 682 transitions. Second operand has 18 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 15 states have internal predecessors, (32), 4 states have call successors, (5), 5 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:18:25,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:18:25,850 INFO L93 Difference]: Finished difference Result 589 states and 758 transitions. [2021-11-02 23:18:25,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-02 23:18:25,850 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 15 states have internal predecessors, (32), 4 states have call successors, (5), 5 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-11-02 23:18:25,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:18:25,858 INFO L225 Difference]: With dead ends: 589 [2021-11-02 23:18:25,858 INFO L226 Difference]: Without dead ends: 589 [2021-11-02 23:18:25,860 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=186, Invalid=1296, Unknown=0, NotChecked=0, Total=1482 [2021-11-02 23:18:25,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 589 states. [2021-11-02 23:18:25,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 589 to 542. [2021-11-02 23:18:25,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 542 states, 379 states have (on average 1.2981530343007917) internal successors, (492), 417 states have internal predecessors, (492), 85 states have call successors, (85), 56 states have call predecessors, (85), 60 states have return successors, (100), 68 states have call predecessors, (100), 84 states have call successors, (100) [2021-11-02 23:18:25,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 542 states to 542 states and 677 transitions. [2021-11-02 23:18:25,889 INFO L78 Accepts]: Start accepts. Automaton has 542 states and 677 transitions. Word has length 38 [2021-11-02 23:18:25,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:18:25,889 INFO L470 AbstractCegarLoop]: Abstraction has 542 states and 677 transitions. [2021-11-02 23:18:25,889 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 15 states have internal predecessors, (32), 4 states have call successors, (5), 5 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 23:18:25,890 INFO L276 IsEmpty]: Start isEmpty. Operand 542 states and 677 transitions. [2021-11-02 23:18:25,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-02 23:18:25,892 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:18:25,892 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:18:25,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-02 23:18:26,117 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-02 23:18:26,118 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONMEMORY_LEAK === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:18:26,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:18:26,118 INFO L85 PathProgramCache]: Analyzing trace with hash -2009287353, now seen corresponding path program 1 times [2021-11-02 23:18:26,118 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:18:26,118 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789119984] [2021-11-02 23:18:26,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:18:26,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:18:26,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:26,183 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:18:26,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:26,188 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 23:18:26,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:26,192 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 23:18:26,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:26,205 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 23:18:26,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:26,211 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-11-02 23:18:26,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:26,215 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-02 23:18:26,216 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:18:26,216 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789119984] [2021-11-02 23:18:26,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789119984] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:18:26,216 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:18:26,217 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-02 23:18:26,217 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108127208] [2021-11-02 23:18:26,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 23:18:26,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:18:26,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 23:18:26,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-02 23:18:26,218 INFO L87 Difference]: Start difference. First operand 542 states and 677 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 4 states have internal predecessors, (26), 3 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-02 23:18:26,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:18:26,631 INFO L93 Difference]: Finished difference Result 551 states and 678 transitions. [2021-11-02 23:18:26,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 23:18:26,631 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 4 states have internal predecessors, (26), 3 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 41 [2021-11-02 23:18:26,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:18:26,634 INFO L225 Difference]: With dead ends: 551 [2021-11-02 23:18:26,634 INFO L226 Difference]: Without dead ends: 551 [2021-11-02 23:18:26,635 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-02 23:18:26,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2021-11-02 23:18:26,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 418. [2021-11-02 23:18:26,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 418 states, 297 states have (on average 1.239057239057239) internal successors, (368), 327 states have internal predecessors, (368), 56 states have call successors, (56), 44 states have call predecessors, (56), 47 states have return successors, (67), 46 states have call predecessors, (67), 55 states have call successors, (67) [2021-11-02 23:18:26,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 418 states to 418 states and 491 transitions. [2021-11-02 23:18:26,655 INFO L78 Accepts]: Start accepts. Automaton has 418 states and 491 transitions. Word has length 41 [2021-11-02 23:18:26,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:18:26,655 INFO L470 AbstractCegarLoop]: Abstraction has 418 states and 491 transitions. [2021-11-02 23:18:26,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 4 states have internal predecessors, (26), 3 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-02 23:18:26,656 INFO L276 IsEmpty]: Start isEmpty. Operand 418 states and 491 transitions. [2021-11-02 23:18:26,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-02 23:18:26,657 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:18:26,657 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] [2021-11-02 23:18:26,658 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-11-02 23:18:26,658 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting removeErr14REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:18:26,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:18:26,658 INFO L85 PathProgramCache]: Analyzing trace with hash -1098107771, now seen corresponding path program 1 times [2021-11-02 23:18:26,659 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:18:26,659 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1359031600] [2021-11-02 23:18:26,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:18:26,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:18:26,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:27,240 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:18:27,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:27,249 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-02 23:18:27,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:27,260 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 23:18:27,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:27,265 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:18:27,265 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:18:27,265 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1359031600] [2021-11-02 23:18:27,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1359031600] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:18:27,266 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [442165399] [2021-11-02 23:18:27,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:18:27,266 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:18:27,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:18:27,268 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:18:27,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-02 23:18:27,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:27,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-02 23:18:27,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:18:27,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-02 23:18:27,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-02 23:18:27,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:18:27,961 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-02 23:18:27,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:18:27,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-02 23:18:28,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 23:18:28,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:18:28,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-02 23:18:28,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:18:28,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-02 23:18:28,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:18:28,371 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-11-02 23:18:28,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 40 [2021-11-02 23:18:28,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:18:28,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:18:28,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 40 [2021-11-02 23:18:28,543 INFO L354 Elim1Store]: treesize reduction 155, result has 13.4 percent of original size [2021-11-02 23:18:28,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 105 treesize of output 101 [2021-11-02 23:18:28,582 INFO L354 Elim1Store]: treesize reduction 164, result has 13.2 percent of original size [2021-11-02 23:18:28,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 91 treesize of output 92 [2021-11-02 23:18:29,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:18:29,910 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 23:18:29,988 INFO L354 Elim1Store]: treesize reduction 271, result has 18.1 percent of original size [2021-11-02 23:18:29,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 143 treesize of output 134 [2021-11-02 23:18:30,040 INFO L354 Elim1Store]: treesize reduction 168, result has 21.1 percent of original size [2021-11-02 23:18:30,040 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 134 treesize of output 132 [2021-11-02 23:18:30,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:18:30,231 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-02 23:18:30,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 2 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 48 [2021-11-02 23:18:30,368 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:18:30,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [442165399] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:18:30,368 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:18:30,369 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16] total 28 [2021-11-02 23:18:30,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111796720] [2021-11-02 23:18:30,369 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-02 23:18:30,369 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:18:30,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-02 23:18:30,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=666, Unknown=0, NotChecked=0, Total=756 [2021-11-02 23:18:30,370 INFO L87 Difference]: Start difference. First operand 418 states and 491 transitions. Second operand has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 25 states have internal predecessors, (60), 4 states have call successors, (9), 5 states have call predecessors, (9), 2 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 23:18:46,550 WARN L207 SmtUtils]: Spent 8.06 s on a formula simplification that was a NOOP. DAG size: 74 [2021-11-02 23:18:48,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:18:48,071 INFO L93 Difference]: Finished difference Result 528 states and 614 transitions. [2021-11-02 23:18:48,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-02 23:18:48,072 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 25 states have internal predecessors, (60), 4 states have call successors, (9), 5 states have call predecessors, (9), 2 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 40 [2021-11-02 23:18:48,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:18:48,077 INFO L225 Difference]: With dead ends: 528 [2021-11-02 23:18:48,077 INFO L226 Difference]: Without dead ends: 528 [2021-11-02 23:18:48,080 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 32 SyntacticMatches, 5 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 789 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=377, Invalid=2485, Unknown=0, NotChecked=0, Total=2862 [2021-11-02 23:18:48,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2021-11-02 23:18:48,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 420. [2021-11-02 23:18:48,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 420 states, 299 states have (on average 1.2274247491638797) internal successors, (367), 329 states have internal predecessors, (367), 56 states have call successors, (56), 44 states have call predecessors, (56), 47 states have return successors, (65), 46 states have call predecessors, (65), 55 states have call successors, (65) [2021-11-02 23:18:48,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 420 states to 420 states and 488 transitions. [2021-11-02 23:18:48,099 INFO L78 Accepts]: Start accepts. Automaton has 420 states and 488 transitions. Word has length 40 [2021-11-02 23:18:48,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:18:48,099 INFO L470 AbstractCegarLoop]: Abstraction has 420 states and 488 transitions. [2021-11-02 23:18:48,100 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.142857142857143) internal successors, (60), 25 states have internal predecessors, (60), 4 states have call successors, (9), 5 states have call predecessors, (9), 2 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 23:18:48,100 INFO L276 IsEmpty]: Start isEmpty. Operand 420 states and 488 transitions. [2021-11-02 23:18:48,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-02 23:18:48,101 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:18:48,101 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] [2021-11-02 23:18:48,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-02 23:18:48,325 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-02 23:18:48,325 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting re_insertErr4REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:18:48,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:18:48,326 INFO L85 PathProgramCache]: Analyzing trace with hash -621812604, now seen corresponding path program 1 times [2021-11-02 23:18:48,326 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:18:48,326 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292878221] [2021-11-02 23:18:48,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:18:48,326 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:18:48,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:48,555 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:18:48,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:48,561 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 23:18:48,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:48,571 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 23:18:48,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:48,595 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 23:18:48,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:48,624 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-11-02 23:18:48,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:48,637 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:18:48,638 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:18:48,638 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292878221] [2021-11-02 23:18:48,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1292878221] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:18:48,638 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:18:48,639 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-02 23:18:48,639 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487363852] [2021-11-02 23:18:48,639 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 23:18:48,640 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:18:48,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 23:18:48,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-11-02 23:18:48,641 INFO L87 Difference]: Start difference. First operand 420 states and 488 transitions. Second operand has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 9 states have internal predecessors, (31), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-02 23:18:49,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:18:49,442 INFO L93 Difference]: Finished difference Result 459 states and 534 transitions. [2021-11-02 23:18:49,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 23:18:49,442 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 9 states have internal predecessors, (31), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 43 [2021-11-02 23:18:49,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:18:49,445 INFO L225 Difference]: With dead ends: 459 [2021-11-02 23:18:49,445 INFO L226 Difference]: Without dead ends: 459 [2021-11-02 23:18:49,445 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2021-11-02 23:18:49,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2021-11-02 23:18:49,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 432. [2021-11-02 23:18:49,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 432 states, 308 states have (on average 1.2207792207792207) internal successors, (376), 338 states have internal predecessors, (376), 58 states have call successors, (58), 45 states have call predecessors, (58), 48 states have return successors, (68), 48 states have call predecessors, (68), 57 states have call successors, (68) [2021-11-02 23:18:49,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 502 transitions. [2021-11-02 23:18:49,497 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 502 transitions. Word has length 43 [2021-11-02 23:18:49,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:18:49,498 INFO L470 AbstractCegarLoop]: Abstraction has 432 states and 502 transitions. [2021-11-02 23:18:49,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 9 states have internal predecessors, (31), 3 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-02 23:18:49,498 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 502 transitions. [2021-11-02 23:18:49,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-02 23:18:49,500 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:18:49,500 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-02 23:18:49,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-11-02 23:18:49,500 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting removeErr7REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:18:49,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:18:49,502 INFO L85 PathProgramCache]: Analyzing trace with hash 1575979422, now seen corresponding path program 1 times [2021-11-02 23:18:49,502 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:18:49,502 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044206982] [2021-11-02 23:18:49,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:18:49,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:18:49,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:49,879 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:18:49,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:49,884 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-02 23:18:49,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:49,946 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-11-02 23:18:49,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:49,951 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-11-02 23:18:49,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:49,956 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 23:18:49,956 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:18:49,956 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044206982] [2021-11-02 23:18:49,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044206982] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:18:49,957 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1462397352] [2021-11-02 23:18:49,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:18:49,957 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:18:49,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:18:49,959 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:18:49,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-02 23:18:50,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:18:50,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-02 23:18:50,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:18:50,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-02 23:18:50,833 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-02 23:18:50,907 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-02 23:18:50,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 52 [2021-11-02 23:18:50,921 INFO L354 Elim1Store]: treesize reduction 35, result has 20.5 percent of original size [2021-11-02 23:18:50,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 48 [2021-11-02 23:18:55,387 INFO L354 Elim1Store]: treesize reduction 43, result has 24.6 percent of original size [2021-11-02 23:18:55,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 114 treesize of output 83 [2021-11-02 23:18:55,408 INFO L354 Elim1Store]: treesize reduction 67, result has 13.0 percent of original size [2021-11-02 23:18:55,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 74 treesize of output 43 [2021-11-02 23:18:55,550 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 23:18:55,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1462397352] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:18:55,551 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:18:55,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 21] total 32 [2021-11-02 23:18:55,551 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536630457] [2021-11-02 23:18:55,551 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-02 23:18:55,552 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:18:55,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-02 23:18:55,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=887, Unknown=0, NotChecked=0, Total=992 [2021-11-02 23:18:55,553 INFO L87 Difference]: Start difference. First operand 432 states and 502 transitions. Second operand has 32 states, 31 states have (on average 1.935483870967742) internal successors, (60), 28 states have internal predecessors, (60), 7 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-02 23:19:33,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:19:33,406 INFO L93 Difference]: Finished difference Result 675 states and 787 transitions. [2021-11-02 23:19:33,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-02 23:19:33,407 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.935483870967742) internal successors, (60), 28 states have internal predecessors, (60), 7 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) Word has length 43 [2021-11-02 23:19:33,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:19:33,411 INFO L225 Difference]: With dead ends: 675 [2021-11-02 23:19:33,412 INFO L226 Difference]: Without dead ends: 675 [2021-11-02 23:19:33,415 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1759 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=795, Invalid=5207, Unknown=4, NotChecked=0, Total=6006 [2021-11-02 23:19:33,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 675 states. [2021-11-02 23:19:33,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 675 to 347. [2021-11-02 23:19:33,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 347 states, 244 states have (on average 1.2459016393442623) internal successors, (304), 268 states have internal predecessors, (304), 47 states have call successors, (47), 38 states have call predecessors, (47), 40 states have return successors, (53), 40 states have call predecessors, (53), 46 states have call successors, (53) [2021-11-02 23:19:33,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 347 states and 404 transitions. [2021-11-02 23:19:33,450 INFO L78 Accepts]: Start accepts. Automaton has 347 states and 404 transitions. Word has length 43 [2021-11-02 23:19:33,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:19:33,451 INFO L470 AbstractCegarLoop]: Abstraction has 347 states and 404 transitions. [2021-11-02 23:19:33,451 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 1.935483870967742) internal successors, (60), 28 states have internal predecessors, (60), 7 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-02 23:19:33,451 INFO L276 IsEmpty]: Start isEmpty. Operand 347 states and 404 transitions. [2021-11-02 23:19:33,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-02 23:19:33,451 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:19:33,452 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] [2021-11-02 23:19:33,498 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-02 23:19:33,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:19:33,652 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting re_insertErr10REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:19:33,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:19:33,653 INFO L85 PathProgramCache]: Analyzing trace with hash -552835854, now seen corresponding path program 1 times [2021-11-02 23:19:33,653 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:19:33,653 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [222629242] [2021-11-02 23:19:33,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:19:33,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:19:33,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:19:33,778 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:19:33,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:19:33,782 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 23:19:33,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:19:33,786 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 23:19:33,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:19:33,800 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 23:19:33,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:19:33,862 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-11-02 23:19:33,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:19:33,866 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:19:33,866 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:19:33,867 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [222629242] [2021-11-02 23:19:33,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [222629242] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:19:33,867 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:19:33,867 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 23:19:33,867 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800688034] [2021-11-02 23:19:33,868 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-02 23:19:33,868 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:19:33,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-02 23:19:33,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2021-11-02 23:19:33,869 INFO L87 Difference]: Start difference. First operand 347 states and 404 transitions. Second operand has 11 states, 11 states have (on average 3.0) internal successors, (33), 8 states have internal predecessors, (33), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-02 23:19:34,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:19:34,951 INFO L93 Difference]: Finished difference Result 370 states and 419 transitions. [2021-11-02 23:19:34,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-02 23:19:34,952 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 8 states have internal predecessors, (33), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 45 [2021-11-02 23:19:34,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:19:34,955 INFO L225 Difference]: With dead ends: 370 [2021-11-02 23:19:34,955 INFO L226 Difference]: Without dead ends: 370 [2021-11-02 23:19:34,957 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2021-11-02 23:19:34,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2021-11-02 23:19:34,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 351. [2021-11-02 23:19:34,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 351 states, 247 states have (on average 1.2307692307692308) internal successors, (304), 272 states have internal predecessors, (304), 47 states have call successors, (47), 38 states have call predecessors, (47), 41 states have return successors, (52), 40 states have call predecessors, (52), 46 states have call successors, (52) [2021-11-02 23:19:34,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 403 transitions. [2021-11-02 23:19:34,972 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 403 transitions. Word has length 45 [2021-11-02 23:19:34,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:19:34,972 INFO L470 AbstractCegarLoop]: Abstraction has 351 states and 403 transitions. [2021-11-02 23:19:34,973 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 8 states have internal predecessors, (33), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-02 23:19:34,973 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 403 transitions. [2021-11-02 23:19:34,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-02 23:19:34,974 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:19:34,974 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-02 23:19:34,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-11-02 23:19:34,975 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting removeErr14REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:19:34,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:19:34,975 INFO L85 PathProgramCache]: Analyzing trace with hash -1251212353, now seen corresponding path program 1 times [2021-11-02 23:19:34,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:19:34,975 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [44653764] [2021-11-02 23:19:34,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:19:34,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:19:34,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:19:35,307 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:19:35,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:19:35,312 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-02 23:19:35,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:19:35,368 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-11-02 23:19:35,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:19:35,373 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-11-02 23:19:35,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:19:35,377 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 23:19:35,377 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:19:35,378 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [44653764] [2021-11-02 23:19:35,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [44653764] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:19:35,378 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302300265] [2021-11-02 23:19:35,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:19:35,378 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:19:35,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:19:35,383 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:19:35,402 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-02 23:19:36,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:19:36,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-02 23:19:36,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:19:36,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-02 23:19:36,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-02 23:19:36,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:19:36,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-02 23:19:36,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:19:36,602 INFO L354 Elim1Store]: treesize reduction 54, result has 31.6 percent of original size [2021-11-02 23:19:36,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 52 treesize of output 62 [2021-11-02 23:19:36,616 INFO L354 Elim1Store]: treesize reduction 35, result has 20.5 percent of original size [2021-11-02 23:19:36,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 56 treesize of output 55 [2021-11-02 23:19:40,021 INFO L354 Elim1Store]: treesize reduction 92, result has 1.1 percent of original size [2021-11-02 23:19:40,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 122 treesize of output 73 [2021-11-02 23:19:40,175 INFO L354 Elim1Store]: treesize reduction 28, result has 3.4 percent of original size [2021-11-02 23:19:40,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 55 treesize of output 22 [2021-11-02 23:19:40,183 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 23:19:40,184 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [302300265] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:19:40,184 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:19:40,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 22] total 33 [2021-11-02 23:19:40,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777548232] [2021-11-02 23:19:40,185 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-02 23:19:40,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:19:40,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-02 23:19:40,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1002, Unknown=0, NotChecked=0, Total=1122 [2021-11-02 23:19:40,186 INFO L87 Difference]: Start difference. First operand 351 states and 403 transitions. Second operand has 34 states, 32 states have (on average 1.96875) internal successors, (63), 30 states have internal predecessors, (63), 7 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-02 23:19:57,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:19:57,873 INFO L93 Difference]: Finished difference Result 499 states and 582 transitions. [2021-11-02 23:19:57,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-02 23:19:57,874 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 32 states have (on average 1.96875) internal successors, (63), 30 states have internal predecessors, (63), 7 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) Word has length 45 [2021-11-02 23:19:57,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:19:57,877 INFO L225 Difference]: With dead ends: 499 [2021-11-02 23:19:57,877 INFO L226 Difference]: Without dead ends: 499 [2021-11-02 23:19:57,879 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1688 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=768, Invalid=5084, Unknown=0, NotChecked=0, Total=5852 [2021-11-02 23:19:57,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 499 states. [2021-11-02 23:19:57,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 499 to 368. [2021-11-02 23:19:57,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 368 states, 260 states have (on average 1.226923076923077) internal successors, (319), 285 states have internal predecessors, (319), 49 states have call successors, (49), 40 states have call predecessors, (49), 43 states have return successors, (55), 42 states have call predecessors, (55), 48 states have call successors, (55) [2021-11-02 23:19:57,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 423 transitions. [2021-11-02 23:19:57,896 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 423 transitions. Word has length 45 [2021-11-02 23:19:57,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:19:57,896 INFO L470 AbstractCegarLoop]: Abstraction has 368 states and 423 transitions. [2021-11-02 23:19:57,897 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 32 states have (on average 1.96875) internal successors, (63), 30 states have internal predecessors, (63), 7 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-02 23:19:57,897 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 423 transitions. [2021-11-02 23:19:57,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-02 23:19:57,898 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:19:57,898 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-02 23:19:57,944 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-02 23:19:58,115 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-02 23:19:58,115 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting removeErr15REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:19:58,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:19:58,115 INFO L85 PathProgramCache]: Analyzing trace with hash -1251212352, now seen corresponding path program 1 times [2021-11-02 23:19:58,115 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:19:58,116 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664097025] [2021-11-02 23:19:58,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:19:58,116 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:19:58,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:19:58,572 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:19:58,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:19:58,577 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-02 23:19:58,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:19:58,647 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-11-02 23:19:58,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:19:58,652 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-11-02 23:19:58,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:19:58,657 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 23:19:58,657 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:19:58,657 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664097025] [2021-11-02 23:19:58,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [664097025] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:19:58,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641839586] [2021-11-02 23:19:58,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:19:58,658 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:19:58,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:19:58,659 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:19:58,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-02 23:19:59,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:19:59,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-02 23:19:59,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:19:59,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-02 23:19:59,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-02 23:19:59,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:19:59,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-02 23:19:59,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:19:59,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-02 23:19:59,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:19:59,901 INFO L354 Elim1Store]: treesize reduction 74, result has 22.1 percent of original size [2021-11-02 23:19:59,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 98 treesize of output 87 [2021-11-02 23:19:59,907 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:19:59,923 INFO L354 Elim1Store]: treesize reduction 54, result has 23.9 percent of original size [2021-11-02 23:19:59,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 78 treesize of output 71 [2021-11-02 23:20:02,605 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-02 23:20:02,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 75 treesize of output 54 [2021-11-02 23:20:02,610 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-02 23:20:02,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 42 treesize of output 26 [2021-11-02 23:20:02,664 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 23:20:02,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [641839586] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:20:02,665 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:20:02,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22] total 35 [2021-11-02 23:20:02,665 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065461243] [2021-11-02 23:20:02,665 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-02 23:20:02,666 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:20:02,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-02 23:20:02,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1147, Unknown=0, NotChecked=0, Total=1260 [2021-11-02 23:20:02,667 INFO L87 Difference]: Start difference. First operand 368 states and 423 transitions. Second operand has 36 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 32 states have internal predecessors, (69), 7 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-02 23:20:20,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:20:20,325 INFO L93 Difference]: Finished difference Result 527 states and 626 transitions. [2021-11-02 23:20:20,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-11-02 23:20:20,325 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 32 states have internal predecessors, (69), 7 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) Word has length 45 [2021-11-02 23:20:20,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:20:20,328 INFO L225 Difference]: With dead ends: 527 [2021-11-02 23:20:20,329 INFO L226 Difference]: Without dead ends: 527 [2021-11-02 23:20:20,332 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2531 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=1080, Invalid=7850, Unknown=0, NotChecked=0, Total=8930 [2021-11-02 23:20:20,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 527 states. [2021-11-02 23:20:20,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 527 to 370. [2021-11-02 23:20:20,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 262 states have (on average 1.217557251908397) internal successors, (319), 287 states have internal predecessors, (319), 49 states have call successors, (49), 40 states have call predecessors, (49), 44 states have return successors, (55), 42 states have call predecessors, (55), 48 states have call successors, (55) [2021-11-02 23:20:20,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 423 transitions. [2021-11-02 23:20:20,346 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 423 transitions. Word has length 45 [2021-11-02 23:20:20,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:20:20,347 INFO L470 AbstractCegarLoop]: Abstraction has 370 states and 423 transitions. [2021-11-02 23:20:20,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 32 states have internal predecessors, (69), 7 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-02 23:20:20,347 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 423 transitions. [2021-11-02 23:20:20,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-02 23:20:20,348 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:20:20,349 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, 1, 1] [2021-11-02 23:20:20,388 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-02 23:20:20,575 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-02 23:20:20,575 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting re_insertErr4REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:20:20,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:20:20,575 INFO L85 PathProgramCache]: Analyzing trace with hash -1925566893, now seen corresponding path program 1 times [2021-11-02 23:20:20,575 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:20:20,576 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213604867] [2021-11-02 23:20:20,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:20:20,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:20:20,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:20,695 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:20:20,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:20,700 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-02 23:20:20,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:20,704 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 23:20:20,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:20,720 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-11-02 23:20:20,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:20,842 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-11-02 23:20:20,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:20,845 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:20:20,846 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:20:20,846 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213604867] [2021-11-02 23:20:20,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213604867] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:20:20,846 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1322871046] [2021-11-02 23:20:20,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:20:20,846 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:20:20,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:20:20,851 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:20:20,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-02 23:20:21,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:21,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-02 23:20:21,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:20:22,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2021-11-02 23:20:22,643 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:20:22,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1322871046] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:20:22,643 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:20:22,643 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2021-11-02 23:20:22,644 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204818562] [2021-11-02 23:20:22,644 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-02 23:20:22,644 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:20:22,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-02 23:20:22,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-02 23:20:22,645 INFO L87 Difference]: Start difference. First operand 370 states and 423 transitions. Second operand has 22 states, 22 states have (on average 2.9545454545454546) internal successors, (65), 19 states have internal predecessors, (65), 4 states have call successors, (12), 6 states have call predecessors, (12), 5 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-02 23:20:55,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:20:55,337 INFO L93 Difference]: Finished difference Result 431 states and 491 transitions. [2021-11-02 23:20:55,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-02 23:20:55,338 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.9545454545454546) internal successors, (65), 19 states have internal predecessors, (65), 4 states have call successors, (12), 6 states have call predecessors, (12), 5 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 49 [2021-11-02 23:20:55,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:20:55,341 INFO L225 Difference]: With dead ends: 431 [2021-11-02 23:20:55,341 INFO L226 Difference]: Without dead ends: 427 [2021-11-02 23:20:55,342 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=218, Invalid=1042, Unknown=0, NotChecked=0, Total=1260 [2021-11-02 23:20:55,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 427 states. [2021-11-02 23:20:55,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 427 to 308. [2021-11-02 23:20:55,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 308 states, 218 states have (on average 1.2431192660550459) internal successors, (271), 241 states have internal predecessors, (271), 40 states have call successors, (40), 32 states have call predecessors, (40), 35 states have return successors, (44), 34 states have call predecessors, (44), 39 states have call successors, (44) [2021-11-02 23:20:55,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 355 transitions. [2021-11-02 23:20:55,354 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 355 transitions. Word has length 49 [2021-11-02 23:20:55,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:20:55,354 INFO L470 AbstractCegarLoop]: Abstraction has 308 states and 355 transitions. [2021-11-02 23:20:55,355 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.9545454545454546) internal successors, (65), 19 states have internal predecessors, (65), 4 states have call successors, (12), 6 states have call predecessors, (12), 5 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-02 23:20:55,355 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 355 transitions. [2021-11-02 23:20:55,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-02 23:20:55,356 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:20:55,356 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:20:55,398 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-11-02 23:20:55,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-02 23:20:55,575 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONMEMORY_LEAK === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:20:55,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:20:55,575 INFO L85 PathProgramCache]: Analyzing trace with hash -1778303392, now seen corresponding path program 1 times [2021-11-02 23:20:55,575 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:20:55,575 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828710283] [2021-11-02 23:20:55,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:20:55,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:20:55,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:55,671 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:20:55,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:55,676 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 23:20:55,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:55,680 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 23:20:55,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:55,694 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 23:20:55,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:55,699 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-11-02 23:20:55,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:55,702 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-11-02 23:20:55,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:55,706 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-11-02 23:20:55,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:55,727 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-02 23:20:55,727 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:20:55,727 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [828710283] [2021-11-02 23:20:55,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [828710283] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:20:55,728 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:20:55,728 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 23:20:55,730 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298753382] [2021-11-02 23:20:55,730 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 23:20:55,731 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:20:55,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 23:20:55,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-02 23:20:55,732 INFO L87 Difference]: Start difference. First operand 308 states and 355 transitions. Second operand has 8 states, 7 states have (on average 5.285714285714286) internal successors, (37), 4 states have internal predecessors, (37), 2 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-02 23:20:56,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:20:56,327 INFO L93 Difference]: Finished difference Result 326 states and 374 transitions. [2021-11-02 23:20:56,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 23:20:56,328 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.285714285714286) internal successors, (37), 4 states have internal predecessors, (37), 2 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 1 states have call successors, (7) Word has length 54 [2021-11-02 23:20:56,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:20:56,330 INFO L225 Difference]: With dead ends: 326 [2021-11-02 23:20:56,331 INFO L226 Difference]: Without dead ends: 326 [2021-11-02 23:20:56,331 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-11-02 23:20:56,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2021-11-02 23:20:56,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 308. [2021-11-02 23:20:56,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 308 states, 218 states have (on average 1.238532110091743) internal successors, (270), 241 states have internal predecessors, (270), 40 states have call successors, (40), 32 states have call predecessors, (40), 35 states have return successors, (44), 34 states have call predecessors, (44), 39 states have call successors, (44) [2021-11-02 23:20:56,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 354 transitions. [2021-11-02 23:20:56,342 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 354 transitions. Word has length 54 [2021-11-02 23:20:56,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:20:56,342 INFO L470 AbstractCegarLoop]: Abstraction has 308 states and 354 transitions. [2021-11-02 23:20:56,343 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.285714285714286) internal successors, (37), 4 states have internal predecessors, (37), 2 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-02 23:20:56,343 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 354 transitions. [2021-11-02 23:20:56,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-02 23:20:56,344 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:20:56,344 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] [2021-11-02 23:20:56,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-11-02 23:20:56,345 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting removeErr14REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:20:56,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:20:56,345 INFO L85 PathProgramCache]: Analyzing trace with hash 13434702, now seen corresponding path program 1 times [2021-11-02 23:20:56,345 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:20:56,346 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1221482229] [2021-11-02 23:20:56,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:20:56,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:20:56,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:56,806 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:20:56,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:56,810 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-11-02 23:20:56,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:56,958 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-11-02 23:20:56,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:56,963 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-11-02 23:20:56,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:56,967 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 23:20:56,967 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:20:56,967 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1221482229] [2021-11-02 23:20:56,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1221482229] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:20:56,968 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1195330989] [2021-11-02 23:20:56,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:20:56,968 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:20:56,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:20:56,971 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:20:56,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-02 23:20:58,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:20:58,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-02 23:20:58,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:20:58,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 23:20:58,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-02 23:20:58,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-02 23:20:58,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:20:58,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-02 23:20:58,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:20:58,591 INFO L354 Elim1Store]: treesize reduction 54, result has 31.6 percent of original size [2021-11-02 23:20:58,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 30 treesize of output 40 [2021-11-02 23:20:58,629 INFO L354 Elim1Store]: treesize reduction 35, result has 20.5 percent of original size [2021-11-02 23:20:58,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-02 23:20:58,937 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-02 23:20:58,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-11-02 23:20:59,103 INFO L354 Elim1Store]: treesize reduction 35, result has 35.2 percent of original size [2021-11-02 23:20:59,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 107 treesize of output 92 [2021-11-02 23:20:59,131 INFO L354 Elim1Store]: treesize reduction 61, result has 23.8 percent of original size [2021-11-02 23:20:59,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 83 treesize of output 98 [2021-11-02 23:20:59,346 INFO L354 Elim1Store]: treesize reduction 84, result has 16.8 percent of original size [2021-11-02 23:20:59,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 49 treesize of output 54 [2021-11-02 23:20:59,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:20:59,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:20:59,418 INFO L354 Elim1Store]: treesize reduction 71, result has 19.3 percent of original size [2021-11-02 23:20:59,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 64 treesize of output 80 [2021-11-02 23:20:59,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:20:59,764 INFO L354 Elim1Store]: treesize reduction 210, result has 36.6 percent of original size [2021-11-02 23:20:59,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 14 case distinctions, treesize of input 219 treesize of output 260 [2021-11-02 23:20:59,860 INFO L354 Elim1Store]: treesize reduction 144, result has 36.3 percent of original size [2021-11-02 23:20:59,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 9 case distinctions, treesize of input 316 treesize of output 318 [2021-11-02 23:24:06,941 INFO L354 Elim1Store]: treesize reduction 234, result has 19.0 percent of original size [2021-11-02 23:24:06,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 9 new quantified variables, introduced 21 case distinctions, treesize of input 280 treesize of output 218 [2021-11-02 23:24:22,040 INFO L354 Elim1Store]: treesize reduction 122, result has 28.7 percent of original size [2021-11-02 23:24:22,040 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 249 treesize of output 176 [2021-11-02 23:24:22,760 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 23:24:22,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1195330989] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:24:22,760 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:24:22,761 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 26] total 42 [2021-11-02 23:24:22,761 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942769513] [2021-11-02 23:24:22,761 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-02 23:24:22,761 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:24:22,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-02 23:24:22,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1641, Unknown=0, NotChecked=0, Total=1806 [2021-11-02 23:24:22,762 INFO L87 Difference]: Start difference. First operand 308 states and 354 transitions. Second operand has 43 states, 41 states have (on average 1.829268292682927) internal successors, (75), 39 states have internal predecessors, (75), 7 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-02 23:25:17,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:25:17,915 INFO L93 Difference]: Finished difference Result 587 states and 698 transitions. [2021-11-02 23:25:17,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-02 23:25:17,916 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 41 states have (on average 1.829268292682927) internal successors, (75), 39 states have internal predecessors, (75), 7 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) Word has length 51 [2021-11-02 23:25:17,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:25:17,918 INFO L225 Difference]: With dead ends: 587 [2021-11-02 23:25:17,918 INFO L226 Difference]: Without dead ends: 587 [2021-11-02 23:25:17,923 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3743 ImplicationChecksByTransitivity, 23.9s TimeCoverageRelationStatistics Valid=1415, Invalid=11464, Unknown=3, NotChecked=0, Total=12882 [2021-11-02 23:25:17,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 587 states. [2021-11-02 23:25:17,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 587 to 287. [2021-11-02 23:25:17,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 287 states, 203 states have (on average 1.2463054187192117) internal successors, (253), 224 states have internal predecessors, (253), 38 states have call successors, (38), 30 states have call predecessors, (38), 32 states have return successors, (41), 32 states have call predecessors, (41), 37 states have call successors, (41) [2021-11-02 23:25:17,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 332 transitions. [2021-11-02 23:25:17,935 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 332 transitions. Word has length 51 [2021-11-02 23:25:17,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:25:17,935 INFO L470 AbstractCegarLoop]: Abstraction has 287 states and 332 transitions. [2021-11-02 23:25:17,935 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 41 states have (on average 1.829268292682927) internal successors, (75), 39 states have internal predecessors, (75), 7 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-02 23:25:17,936 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 332 transitions. [2021-11-02 23:25:17,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-02 23:25:17,937 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:25:17,937 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, 1, 1, 1, 1, 1, 1] [2021-11-02 23:25:17,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-02 23:25:18,159 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-02 23:25:18,159 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting re_insertErr4REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:25:18,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:25:18,159 INFO L85 PathProgramCache]: Analyzing trace with hash 1112219213, now seen corresponding path program 1 times [2021-11-02 23:25:18,159 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:25:18,159 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664793741] [2021-11-02 23:25:18,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:25:18,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:25:18,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:25:18,697 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:25:18,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:25:18,708 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-02 23:25:18,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:25:18,713 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 23:25:18,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:25:18,749 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-11-02 23:25:18,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:25:19,241 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-02 23:25:19,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:25:19,253 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:25:19,253 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:25:19,253 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664793741] [2021-11-02 23:25:19,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [664793741] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:25:19,253 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [113494929] [2021-11-02 23:25:19,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:25:19,254 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:25:19,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:25:19,267 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:25:19,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-02 23:25:20,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:25:20,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-02 23:25:20,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:25:20,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-11-02 23:25:23,083 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_main_~x~0.base_BEFORE_CALL_32 Int) (v_main_~x~0.offset_BEFORE_CALL_32 Int)) (and (<= v_main_~x~0.offset_BEFORE_CALL_32 0) (< (+ (select (select |c_#memory_$Pointer$.base| v_main_~x~0.base_BEFORE_CALL_32) (+ 4 v_main_~x~0.offset_BEFORE_CALL_32)) 1) v_main_~x~0.base_BEFORE_CALL_32))) is different from true [2021-11-02 23:25:25,278 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_main_~x~0.offset_BEFORE_CALL_33 Int) (v_main_~x~0.base_BEFORE_CALL_33 Int)) (and (<= v_main_~x~0.offset_BEFORE_CALL_33 0) (< (+ (select (select |c_#memory_$Pointer$.base| v_main_~x~0.base_BEFORE_CALL_33) (+ 4 v_main_~x~0.offset_BEFORE_CALL_33)) 1) v_main_~x~0.base_BEFORE_CALL_33))) is different from true [2021-11-02 23:25:25,995 INFO L354 Elim1Store]: treesize reduction 78, result has 14.3 percent of original size [2021-11-02 23:25:25,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 52 treesize of output 39 [2021-11-02 23:25:26,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 20 [2021-11-02 23:25:26,812 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:25:26,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [113494929] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:25:26,812 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:25:26,813 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 17] total 35 [2021-11-02 23:25:26,813 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899350459] [2021-11-02 23:25:26,814 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-02 23:25:26,814 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:25:26,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-02 23:25:26,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=1034, Unknown=2, NotChecked=130, Total=1260 [2021-11-02 23:25:26,815 INFO L87 Difference]: Start difference. First operand 287 states and 332 transitions. Second operand has 36 states, 35 states have (on average 2.2857142857142856) internal successors, (80), 30 states have internal predecessors, (80), 5 states have call successors, (13), 9 states have call predecessors, (13), 6 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-02 23:25:44,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:25:44,988 INFO L93 Difference]: Finished difference Result 316 states and 355 transitions. [2021-11-02 23:25:44,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-02 23:25:44,989 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 2.2857142857142856) internal successors, (80), 30 states have internal predecessors, (80), 5 states have call successors, (13), 9 states have call predecessors, (13), 6 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) Word has length 53 [2021-11-02 23:25:44,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:25:44,990 INFO L225 Difference]: With dead ends: 316 [2021-11-02 23:25:44,991 INFO L226 Difference]: Without dead ends: 316 [2021-11-02 23:25:44,991 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 44 SyntacticMatches, 5 SemanticMatches, 57 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 788 ImplicationChecksByTransitivity, 19.9s TimeCoverageRelationStatistics Valid=321, Invalid=2873, Unknown=6, NotChecked=222, Total=3422 [2021-11-02 23:25:44,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2021-11-02 23:25:45,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 287. [2021-11-02 23:25:45,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 287 states, 203 states have (on average 1.2413793103448276) internal successors, (252), 224 states have internal predecessors, (252), 38 states have call successors, (38), 30 states have call predecessors, (38), 32 states have return successors, (41), 32 states have call predecessors, (41), 37 states have call successors, (41) [2021-11-02 23:25:45,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 331 transitions. [2021-11-02 23:25:45,003 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 331 transitions. Word has length 53 [2021-11-02 23:25:45,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:25:45,004 INFO L470 AbstractCegarLoop]: Abstraction has 287 states and 331 transitions. [2021-11-02 23:25:45,004 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 2.2857142857142856) internal successors, (80), 30 states have internal predecessors, (80), 5 states have call successors, (13), 9 states have call predecessors, (13), 6 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-02 23:25:45,004 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 331 transitions. [2021-11-02 23:25:45,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-02 23:25:45,006 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:25:45,006 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, 1, 1, 1, 1, 1, 1] [2021-11-02 23:25:45,057 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-02 23:25:45,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-02 23:25:45,223 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting re_insertErr5REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:25:45,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:25:45,224 INFO L85 PathProgramCache]: Analyzing trace with hash 1112219214, now seen corresponding path program 1 times [2021-11-02 23:25:45,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:25:45,224 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [76304450] [2021-11-02 23:25:45,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:25:45,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:25:45,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:25:45,953 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:25:45,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:25:45,964 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-02 23:25:45,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:25:45,969 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 23:25:45,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:25:46,010 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-11-02 23:25:46,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:25:46,776 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-02 23:25:46,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:25:46,792 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:25:46,793 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:25:46,793 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [76304450] [2021-11-02 23:25:46,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [76304450] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:25:46,793 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [415275097] [2021-11-02 23:25:46,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:25:46,794 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:25:46,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:25:46,799 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:25:46,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-02 23:25:48,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:25:48,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-02 23:25:48,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:25:48,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 23:25:48,167 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-02 23:25:48,168 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-11-02 23:25:48,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-02 23:25:48,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-02 23:25:48,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 19 [2021-11-02 23:25:48,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 13 [2021-11-02 23:25:51,226 WARN L860 $PredicateComparison]: unable to prove that (and (exists ((v_arrayElimCell_162 Int)) (<= 8 (select |c_#length| v_arrayElimCell_162))) (exists ((|remove_#t~mem7.base| Int) (|remove_#t~mem6.offset| Int) (|remove_#t~mem7.offset| Int)) (let ((.cse0 (select (select |c_old(#memory_$Pointer$.base)| |c_remove_#in~x.base|) (+ 4 |c_remove_#in~x.offset|)))) (and (= |c_#memory_$Pointer$.offset| (store |c_old(#memory_$Pointer$.offset)| .cse0 (store (select |c_old(#memory_$Pointer$.offset)| .cse0) |remove_#t~mem6.offset| |remove_#t~mem7.offset|))) (= (store |c_old(#memory_$Pointer$.base)| .cse0 (store (select |c_old(#memory_$Pointer$.base)| .cse0) |remove_#t~mem6.offset| |remove_#t~mem7.base|)) |c_#memory_$Pointer$.base|))))) is different from true [2021-11-02 23:25:51,347 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-02 23:25:51,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 77 treesize of output 49 [2021-11-02 23:25:51,363 INFO L354 Elim1Store]: treesize reduction 43, result has 17.3 percent of original size [2021-11-02 23:25:51,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 54 treesize of output 47 [2021-11-02 23:25:51,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 31 [2021-11-02 23:25:51,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 16 [2021-11-02 23:25:51,975 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:25:51,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [415275097] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:25:51,975 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:25:51,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 14] total 35 [2021-11-02 23:25:51,975 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080483957] [2021-11-02 23:25:51,976 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-02 23:25:51,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:25:51,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-02 23:25:51,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=1099, Unknown=1, NotChecked=66, Total=1260 [2021-11-02 23:25:51,977 INFO L87 Difference]: Start difference. First operand 287 states and 331 transitions. Second operand has 36 states, 35 states have (on average 2.3142857142857145) internal successors, (81), 30 states have internal predecessors, (81), 4 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-02 23:26:03,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:26:03,153 INFO L93 Difference]: Finished difference Result 430 states and 481 transitions. [2021-11-02 23:26:03,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-02 23:26:03,154 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 2.3142857142857145) internal successors, (81), 30 states have internal predecessors, (81), 4 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) Word has length 53 [2021-11-02 23:26:03,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:26:03,160 INFO L225 Difference]: With dead ends: 430 [2021-11-02 23:26:03,160 INFO L226 Difference]: Without dead ends: 430 [2021-11-02 23:26:03,161 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 45 SyntacticMatches, 7 SemanticMatches, 60 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 978 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=375, Invalid=3288, Unknown=1, NotChecked=118, Total=3782 [2021-11-02 23:26:03,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2021-11-02 23:26:03,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 285. [2021-11-02 23:26:03,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 285 states, 202 states have (on average 1.2376237623762376) internal successors, (250), 222 states have internal predecessors, (250), 38 states have call successors, (38), 30 states have call predecessors, (38), 31 states have return successors, (40), 32 states have call predecessors, (40), 37 states have call successors, (40) [2021-11-02 23:26:03,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285 states to 285 states and 328 transitions. [2021-11-02 23:26:03,172 INFO L78 Accepts]: Start accepts. Automaton has 285 states and 328 transitions. Word has length 53 [2021-11-02 23:26:03,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:26:03,173 INFO L470 AbstractCegarLoop]: Abstraction has 285 states and 328 transitions. [2021-11-02 23:26:03,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 2.3142857142857145) internal successors, (81), 30 states have internal predecessors, (81), 4 states have call successors, (13), 7 states have call predecessors, (13), 4 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) [2021-11-02 23:26:03,173 INFO L276 IsEmpty]: Start isEmpty. Operand 285 states and 328 transitions. [2021-11-02 23:26:03,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-02 23:26:03,174 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:26:03,175 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-02 23:26:03,226 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-02 23:26:03,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:26:03,399 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting re_insertErr0REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:26:03,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:26:03,399 INFO L85 PathProgramCache]: Analyzing trace with hash -103631128, now seen corresponding path program 1 times [2021-11-02 23:26:03,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:26:03,400 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [820444664] [2021-11-02 23:26:03,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:26:03,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:26:03,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:03,542 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:26:03,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:03,547 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-02 23:26:03,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:03,621 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-11-02 23:26:03,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:03,625 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-11-02 23:26:03,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:03,691 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-11-02 23:26:03,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:03,696 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-11-02 23:26:03,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:03,700 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 23:26:03,700 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:26:03,700 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [820444664] [2021-11-02 23:26:03,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [820444664] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:26:03,701 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1925246311] [2021-11-02 23:26:03,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:26:03,701 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:26:03,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:26:03,703 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:26:03,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-02 23:26:05,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:05,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-02 23:26:05,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:26:05,605 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-02 23:26:05,606 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1925246311] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:26:05,606 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:26:05,606 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 14 [2021-11-02 23:26:05,606 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050465126] [2021-11-02 23:26:05,606 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-02 23:26:05,607 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:26:05,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-02 23:26:05,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2021-11-02 23:26:05,607 INFO L87 Difference]: Start difference. First operand 285 states and 328 transitions. Second operand has 14 states, 14 states have (on average 4.571428571428571) internal successors, (64), 12 states have internal predecessors, (64), 6 states have call successors, (14), 4 states have call predecessors, (14), 3 states have return successors, (11), 5 states have call predecessors, (11), 6 states have call successors, (11) [2021-11-02 23:26:07,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:26:07,466 INFO L93 Difference]: Finished difference Result 296 states and 339 transitions. [2021-11-02 23:26:07,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-02 23:26:07,467 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.571428571428571) internal successors, (64), 12 states have internal predecessors, (64), 6 states have call successors, (14), 4 states have call predecessors, (14), 3 states have return successors, (11), 5 states have call predecessors, (11), 6 states have call successors, (11) Word has length 55 [2021-11-02 23:26:07,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:26:07,468 INFO L225 Difference]: With dead ends: 296 [2021-11-02 23:26:07,468 INFO L226 Difference]: Without dead ends: 296 [2021-11-02 23:26:07,469 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=102, Invalid=450, Unknown=0, NotChecked=0, Total=552 [2021-11-02 23:26:07,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-11-02 23:26:07,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 279. [2021-11-02 23:26:07,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 199 states have (on average 1.2311557788944723) internal successors, (245), 217 states have internal predecessors, (245), 36 states have call successors, (36), 29 states have call predecessors, (36), 30 states have return successors, (38), 32 states have call predecessors, (38), 35 states have call successors, (38) [2021-11-02 23:26:07,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 319 transitions. [2021-11-02 23:26:07,480 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 319 transitions. Word has length 55 [2021-11-02 23:26:07,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:26:07,480 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 319 transitions. [2021-11-02 23:26:07,480 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.571428571428571) internal successors, (64), 12 states have internal predecessors, (64), 6 states have call successors, (14), 4 states have call predecessors, (14), 3 states have return successors, (11), 5 states have call predecessors, (11), 6 states have call successors, (11) [2021-11-02 23:26:07,481 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 319 transitions. [2021-11-02 23:26:07,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-02 23:26:07,482 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:26:07,482 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] [2021-11-02 23:26:07,529 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-02 23:26:07,703 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-02 23:26:07,703 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting mainErr10ENSURES_VIOLATIONMEMORY_LEAK === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:26:07,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:26:07,703 INFO L85 PathProgramCache]: Analyzing trace with hash 990213135, now seen corresponding path program 1 times [2021-11-02 23:26:07,703 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:26:07,703 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2050938509] [2021-11-02 23:26:07,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:26:07,704 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:26:07,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:07,853 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:26:07,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:07,857 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2021-11-02 23:26:07,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:07,862 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 23:26:07,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:07,921 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 23:26:07,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:07,926 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-11-02 23:26:07,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:07,930 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-11-02 23:26:07,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:07,936 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-11-02 23:26:07,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:07,953 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-11-02 23:26:07,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:07,956 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-02 23:26:07,956 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:26:07,956 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2050938509] [2021-11-02 23:26:07,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2050938509] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:26:07,957 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:26:07,957 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-02 23:26:07,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046896681] [2021-11-02 23:26:07,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 23:26:07,957 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:26:07,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 23:26:07,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-02 23:26:07,958 INFO L87 Difference]: Start difference. First operand 279 states and 319 transitions. Second operand has 6 states, 5 states have (on average 6.8) internal successors, (34), 4 states have internal predecessors, (34), 2 states have call successors, (9), 4 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-02 23:26:08,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:26:08,590 INFO L93 Difference]: Finished difference Result 290 states and 329 transitions. [2021-11-02 23:26:08,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 23:26:08,591 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.8) internal successors, (34), 4 states have internal predecessors, (34), 2 states have call successors, (9), 4 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 57 [2021-11-02 23:26:08,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:26:08,593 INFO L225 Difference]: With dead ends: 290 [2021-11-02 23:26:08,593 INFO L226 Difference]: Without dead ends: 251 [2021-11-02 23:26:08,593 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-02 23:26:08,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2021-11-02 23:26:08,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 243. [2021-11-02 23:26:08,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 174 states have (on average 1.2586206896551724) internal successors, (219), 191 states have internal predecessors, (219), 30 states have call successors, (30), 24 states have call predecessors, (30), 25 states have return successors, (32), 27 states have call predecessors, (32), 29 states have call successors, (32) [2021-11-02 23:26:08,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 281 transitions. [2021-11-02 23:26:08,602 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 281 transitions. Word has length 57 [2021-11-02 23:26:08,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:26:08,603 INFO L470 AbstractCegarLoop]: Abstraction has 243 states and 281 transitions. [2021-11-02 23:26:08,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.8) internal successors, (34), 4 states have internal predecessors, (34), 2 states have call successors, (9), 4 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-02 23:26:08,603 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 281 transitions. [2021-11-02 23:26:08,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-02 23:26:08,604 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:26:08,604 INFO L513 BasicCegarLoop]: trace histogram [4, 3, 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] [2021-11-02 23:26:08,604 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-11-02 23:26:08,605 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting is_list_containing_xErr1REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:26:08,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:26:08,605 INFO L85 PathProgramCache]: Analyzing trace with hash 760261571, now seen corresponding path program 1 times [2021-11-02 23:26:08,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:26:08,605 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1775135031] [2021-11-02 23:26:08,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:26:08,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:26:08,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:08,991 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:26:08,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:08,995 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-02 23:26:08,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:09,061 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-11-02 23:26:09,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:09,064 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-11-02 23:26:09,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:09,093 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-11-02 23:26:09,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:09,185 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-02 23:26:09,185 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:26:09,185 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1775135031] [2021-11-02 23:26:09,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1775135031] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:26:09,185 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [925020109] [2021-11-02 23:26:09,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:26:09,185 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:26:09,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:26:09,187 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:26:09,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-02 23:26:10,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:10,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-02 23:26:10,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:26:10,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-02 23:26:10,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:26:10,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-02 23:26:10,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:26:10,753 INFO L354 Elim1Store]: treesize reduction 54, result has 31.6 percent of original size [2021-11-02 23:26:10,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 30 treesize of output 40 [2021-11-02 23:26:14,391 INFO L354 Elim1Store]: treesize reduction 45, result has 2.2 percent of original size [2021-11-02 23:26:14,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 1 [2021-11-02 23:26:14,419 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 13 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-02 23:26:14,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [925020109] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:26:14,419 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:26:14,419 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14] total 26 [2021-11-02 23:26:14,419 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492447784] [2021-11-02 23:26:14,420 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-02 23:26:14,420 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:26:14,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-02 23:26:14,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=564, Unknown=1, NotChecked=0, Total=650 [2021-11-02 23:26:14,421 INFO L87 Difference]: Start difference. First operand 243 states and 281 transitions. Second operand has 26 states, 26 states have (on average 2.5) internal successors, (65), 23 states have internal predecessors, (65), 7 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-02 23:26:49,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:26:49,823 INFO L93 Difference]: Finished difference Result 299 states and 346 transitions. [2021-11-02 23:26:49,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-02 23:26:49,824 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.5) internal successors, (65), 23 states have internal predecessors, (65), 7 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) Word has length 56 [2021-11-02 23:26:49,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:26:49,826 INFO L225 Difference]: With dead ends: 299 [2021-11-02 23:26:49,826 INFO L226 Difference]: Without dead ends: 299 [2021-11-02 23:26:49,827 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 55 SyntacticMatches, 3 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=270, Invalid=1621, Unknown=1, NotChecked=0, Total=1892 [2021-11-02 23:26:49,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-11-02 23:26:49,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 246. [2021-11-02 23:26:49,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 175 states have (on average 1.2571428571428571) internal successors, (220), 192 states have internal predecessors, (220), 32 states have call successors, (32), 24 states have call predecessors, (32), 25 states have return successors, (34), 29 states have call predecessors, (34), 31 states have call successors, (34) [2021-11-02 23:26:49,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 286 transitions. [2021-11-02 23:26:49,836 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 286 transitions. Word has length 56 [2021-11-02 23:26:49,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:26:49,836 INFO L470 AbstractCegarLoop]: Abstraction has 246 states and 286 transitions. [2021-11-02 23:26:49,837 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.5) internal successors, (65), 23 states have internal predecessors, (65), 7 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-02 23:26:49,837 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 286 transitions. [2021-11-02 23:26:49,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-02 23:26:49,838 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:26:49,838 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:26:49,896 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-02 23:26:50,055 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:26:50,055 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting re_insertErr10REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:26:50,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:26:50,055 INFO L85 PathProgramCache]: Analyzing trace with hash 723658426, now seen corresponding path program 1 times [2021-11-02 23:26:50,055 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:26:50,055 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1646049384] [2021-11-02 23:26:50,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:26:50,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:26:50,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:50,435 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:26:50,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:50,439 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-02 23:26:50,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:50,443 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 23:26:50,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:50,482 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-11-02 23:26:50,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:50,609 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-02 23:26:50,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:50,617 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:26:50,617 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:26:50,617 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1646049384] [2021-11-02 23:26:50,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1646049384] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:26:50,617 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1114886751] [2021-11-02 23:26:50,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:26:50,618 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:26:50,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:26:50,619 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:26:50,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-02 23:26:52,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:26:52,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-02 23:26:52,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:26:52,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 23:26:52,278 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-02 23:26:52,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-11-02 23:26:52,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-02 23:26:52,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-02 23:26:53,299 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 37 [2021-11-02 23:27:01,400 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 23:27:01,412 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-02 23:27:01,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 32 treesize of output 24 [2021-11-02 23:27:02,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:27:02,171 INFO L354 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2021-11-02 23:27:02,172 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 57 treesize of output 66 [2021-11-02 23:27:02,228 INFO L354 Elim1Store]: treesize reduction 32, result has 49.2 percent of original size [2021-11-02 23:27:02,228 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 60 treesize of output 78 [2021-11-02 23:27:02,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:27:02,611 INFO L354 Elim1Store]: treesize reduction 19, result has 29.6 percent of original size [2021-11-02 23:27:02,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 98 treesize of output 73 [2021-11-02 23:27:03,028 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 23:27:03,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 20 [2021-11-02 23:27:03,087 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:27:03,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1114886751] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:27:03,087 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:27:03,087 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 22] total 37 [2021-11-02 23:27:03,087 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292754916] [2021-11-02 23:27:03,088 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-02 23:27:03,088 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:27:03,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-02 23:27:03,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1283, Unknown=1, NotChecked=0, Total=1406 [2021-11-02 23:27:03,089 INFO L87 Difference]: Start difference. First operand 246 states and 286 transitions. Second operand has 38 states, 37 states have (on average 2.4594594594594597) internal successors, (91), 33 states have internal predecessors, (91), 5 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-02 23:29:02,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:29:02,193 INFO L93 Difference]: Finished difference Result 309 states and 348 transitions. [2021-11-02 23:29:02,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-02 23:29:02,194 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 2.4594594594594597) internal successors, (91), 33 states have internal predecessors, (91), 5 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) Word has length 58 [2021-11-02 23:29:02,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:29:02,196 INFO L225 Difference]: With dead ends: 309 [2021-11-02 23:29:02,196 INFO L226 Difference]: Without dead ends: 307 [2021-11-02 23:29:02,197 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 43 SyntacticMatches, 4 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1487 ImplicationChecksByTransitivity, 40.5s TimeCoverageRelationStatistics Valid=507, Invalid=4878, Unknown=17, NotChecked=0, Total=5402 [2021-11-02 23:29:02,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2021-11-02 23:29:02,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 274. [2021-11-02 23:29:02,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 274 states, 196 states have (on average 1.2346938775510203) internal successors, (242), 213 states have internal predecessors, (242), 36 states have call successors, (36), 28 states have call predecessors, (36), 28 states have return successors, (38), 32 states have call predecessors, (38), 35 states have call successors, (38) [2021-11-02 23:29:02,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 316 transitions. [2021-11-02 23:29:02,206 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 316 transitions. Word has length 58 [2021-11-02 23:29:02,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:29:02,206 INFO L470 AbstractCegarLoop]: Abstraction has 274 states and 316 transitions. [2021-11-02 23:29:02,206 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 2.4594594594594597) internal successors, (91), 33 states have internal predecessors, (91), 5 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-02 23:29:02,207 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 316 transitions. [2021-11-02 23:29:02,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-02 23:29:02,208 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:29:02,208 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:29:02,253 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-02 23:29:02,431 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:29:02,431 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting re_insertErr11REQUIRES_VIOLATION === [is_list_containing_xErr0REQUIRES_VIOLATION, is_list_containing_xErr1REQUIRES_VIOLATION, is_list_containing_xErr2REQUIRES_VIOLATION (and 41 more)] === [2021-11-02 23:29:02,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:29:02,431 INFO L85 PathProgramCache]: Analyzing trace with hash 723658427, now seen corresponding path program 1 times [2021-11-02 23:29:02,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:29:02,431 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461127176] [2021-11-02 23:29:02,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:29:02,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:29:02,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:29:03,032 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:29:03,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:29:03,036 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-11-02 23:29:03,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:29:03,048 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-11-02 23:29:03,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:29:03,086 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-11-02 23:29:03,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:29:03,219 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-02 23:29:03,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:29:03,225 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:29:03,225 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:29:03,225 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461127176] [2021-11-02 23:29:03,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1461127176] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:29:03,225 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [259330381] [2021-11-02 23:29:03,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:29:03,226 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:29:03,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:29:03,227 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:29:03,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bd3b3e1d-92e7-415e-85e5-579b4fbbbe48/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-02 23:29:04,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:29:04,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-02 23:29:04,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:29:04,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-02 23:29:07,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-02 23:29:07,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 37 [2021-11-02 23:29:15,280 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 23:29:15,291 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-02 23:29:15,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 33 treesize of output 25 [2021-11-02 23:29:15,999 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 23:29:16,023 INFO L354 Elim1Store]: treesize reduction 78, result has 17.9 percent of original size [2021-11-02 23:29:16,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 82 treesize of output 65 [2021-11-02 23:29:16,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:29:16,054 INFO L354 Elim1Store]: treesize reduction 78, result has 17.9 percent of original size [2021-11-02 23:29:16,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 74 treesize of output 67 [2021-11-02 23:29:16,335 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:29:16,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [259330381] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:29:16,336 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:29:16,336 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 20] total 36 [2021-11-02 23:29:16,336 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868421243] [2021-11-02 23:29:16,336 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-02 23:29:16,336 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:29:16,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-02 23:29:16,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1137, Unknown=3, NotChecked=0, Total=1260 [2021-11-02 23:29:16,337 INFO L87 Difference]: Start difference. First operand 274 states and 316 transitions. Second operand has 36 states, 36 states have (on average 2.5277777777777777) internal successors, (91), 31 states have internal predecessors, (91), 5 states have call successors, (13), 8 states have call predecessors, (13), 5 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9)