./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_m2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/config/AutomizerReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_m2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 64e2b591ee375a99f019d69fefe326e9fd46db25f76a67e4f3bee333adbec68f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-22 15:29:42,965 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-22 15:29:42,968 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-22 15:29:43,025 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-22 15:29:43,026 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-22 15:29:43,027 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-22 15:29:43,029 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-22 15:29:43,032 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-22 15:29:43,035 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-22 15:29:43,036 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-22 15:29:43,038 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-22 15:29:43,040 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-22 15:29:43,040 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-22 15:29:43,042 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-22 15:29:43,044 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-22 15:29:43,046 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-22 15:29:43,047 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-22 15:29:43,049 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-22 15:29:43,051 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-22 15:29:43,054 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-22 15:29:43,057 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-22 15:29:43,060 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-22 15:29:43,062 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-22 15:29:43,063 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-22 15:29:43,067 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-22 15:29:43,068 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-22 15:29:43,069 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-22 15:29:43,070 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-22 15:29:43,071 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-22 15:29:43,073 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-22 15:29:43,073 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-22 15:29:43,075 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-22 15:29:43,076 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-22 15:29:43,077 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-22 15:29:43,079 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-22 15:29:43,080 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-22 15:29:43,081 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-22 15:29:43,081 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-22 15:29:43,082 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-22 15:29:43,083 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-22 15:29:43,084 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-22 15:29:43,085 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-22 15:29:43,113 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-22 15:29:43,113 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-22 15:29:43,114 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-22 15:29:43,114 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-22 15:29:43,116 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-22 15:29:43,116 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-22 15:29:43,117 INFO L138 SettingsManager]: * Use SBE=true [2021-11-22 15:29:43,117 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-22 15:29:43,117 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-22 15:29:43,118 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-22 15:29:43,118 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-22 15:29:43,118 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-22 15:29:43,119 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-22 15:29:43,119 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-22 15:29:43,119 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-22 15:29:43,120 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-22 15:29:43,120 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-22 15:29:43,120 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-22 15:29:43,121 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-22 15:29:43,121 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-22 15:29:43,121 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-22 15:29:43,122 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-22 15:29:43,122 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-22 15:29:43,122 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-22 15:29:43,123 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-22 15:29:43,123 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-22 15:29:43,123 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-22 15:29:43,124 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-22 15:29:43,124 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-22 15:29:43,125 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-22 15:29:43,125 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-22 15:29:43,125 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-22 15:29:43,126 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_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 64e2b591ee375a99f019d69fefe326e9fd46db25f76a67e4f3bee333adbec68f [2021-11-22 15:29:43,435 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-22 15:29:43,467 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-22 15:29:43,470 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-22 15:29:43,472 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-22 15:29:43,473 INFO L275 PluginConnector]: CDTParser initialized [2021-11-22 15:29:43,475 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/../../sv-benchmarks/c/array-crafted/zero_sum_m2.c [2021-11-22 15:29:43,564 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/data/78c8e1923/ba3ce7cdd45345e2ac50256092488f63/FLAG27a1b9861 [2021-11-22 15:29:44,199 INFO L306 CDTParser]: Found 1 translation units. [2021-11-22 15:29:44,201 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/sv-benchmarks/c/array-crafted/zero_sum_m2.c [2021-11-22 15:29:44,215 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/data/78c8e1923/ba3ce7cdd45345e2ac50256092488f63/FLAG27a1b9861 [2021-11-22 15:29:44,525 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/data/78c8e1923/ba3ce7cdd45345e2ac50256092488f63 [2021-11-22 15:29:44,528 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-22 15:29:44,530 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-22 15:29:44,532 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-22 15:29:44,532 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-22 15:29:44,535 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-22 15:29:44,536 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 03:29:44" (1/1) ... [2021-11-22 15:29:44,537 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@459b4e8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:29:44, skipping insertion in model container [2021-11-22 15:29:44,537 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 03:29:44" (1/1) ... [2021-11-22 15:29:44,546 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-22 15:29:44,562 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-22 15:29:44,831 WARN L230 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_34217607-af62-4809-8ae5-3e69daa80041/sv-benchmarks/c/array-crafted/zero_sum_m2.c[402,415] [2021-11-22 15:29:44,859 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-22 15:29:44,869 INFO L203 MainTranslator]: Completed pre-run [2021-11-22 15:29:44,889 WARN L230 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_34217607-af62-4809-8ae5-3e69daa80041/sv-benchmarks/c/array-crafted/zero_sum_m2.c[402,415] [2021-11-22 15:29:44,915 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-22 15:29:44,934 INFO L208 MainTranslator]: Completed translation [2021-11-22 15:29:44,936 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:29:44 WrapperNode [2021-11-22 15:29:44,936 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-22 15:29:44,938 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-22 15:29:44,938 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-22 15:29:44,939 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-22 15:29:44,947 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:29:44" (1/1) ... [2021-11-22 15:29:44,956 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:29:44" (1/1) ... [2021-11-22 15:29:44,985 INFO L137 Inliner]: procedures = 15, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 83 [2021-11-22 15:29:44,985 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-22 15:29:44,987 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-22 15:29:44,987 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-22 15:29:44,987 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-22 15:29:44,996 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:29:44" (1/1) ... [2021-11-22 15:29:44,996 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:29:44" (1/1) ... [2021-11-22 15:29:45,007 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:29:44" (1/1) ... [2021-11-22 15:29:45,008 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:29:44" (1/1) ... [2021-11-22 15:29:45,020 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:29:44" (1/1) ... [2021-11-22 15:29:45,028 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:29:44" (1/1) ... [2021-11-22 15:29:45,031 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:29:44" (1/1) ... [2021-11-22 15:29:45,038 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-22 15:29:45,040 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-22 15:29:45,041 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-22 15:29:45,041 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-22 15:29:45,043 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:29:44" (1/1) ... [2021-11-22 15:29:45,052 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-22 15:29:45,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:29:45,086 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-22 15:29:45,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-22 15:29:45,157 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-22 15:29:45,157 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-22 15:29:45,158 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-22 15:29:45,158 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-22 15:29:45,158 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-22 15:29:45,159 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-22 15:29:45,159 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-22 15:29:45,159 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-22 15:29:45,252 INFO L236 CfgBuilder]: Building ICFG [2021-11-22 15:29:45,254 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-22 15:29:45,470 INFO L277 CfgBuilder]: Performing block encoding [2021-11-22 15:29:45,477 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-22 15:29:45,477 INFO L301 CfgBuilder]: Removed 5 assume(true) statements. [2021-11-22 15:29:45,479 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 03:29:45 BoogieIcfgContainer [2021-11-22 15:29:45,480 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-22 15:29:45,482 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-22 15:29:45,482 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-22 15:29:45,486 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-22 15:29:45,487 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 03:29:44" (1/3) ... [2021-11-22 15:29:45,488 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@bd606ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 03:29:45, skipping insertion in model container [2021-11-22 15:29:45,488 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:29:44" (2/3) ... [2021-11-22 15:29:45,489 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@bd606ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 03:29:45, skipping insertion in model container [2021-11-22 15:29:45,489 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 03:29:45" (3/3) ... [2021-11-22 15:29:45,490 INFO L111 eAbstractionObserver]: Analyzing ICFG zero_sum_m2.c [2021-11-22 15:29:45,496 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-22 15:29:45,497 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-22 15:29:45,565 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-22 15:29:45,587 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-22 15:29:45,587 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-22 15:29:45,615 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:29:45,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-22 15:29:45,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:29:45,622 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:29:45,623 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:29:45,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:29:45,629 INFO L85 PathProgramCache]: Analyzing trace with hash -1122046426, now seen corresponding path program 1 times [2021-11-22 15:29:45,639 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:29:45,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853433702] [2021-11-22 15:29:45,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:29:45,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:29:45,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:29:45,834 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:29:45,835 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:29:45,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853433702] [2021-11-22 15:29:45,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [853433702] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-22 15:29:45,837 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-22 15:29:45,837 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-22 15:29:45,839 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514467891] [2021-11-22 15:29:45,840 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-22 15:29:45,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-22 15:29:45,858 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:29:45,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-22 15:29:45,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-22 15:29:45,892 INFO L87 Difference]: Start difference. First operand has 26 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:29:45,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:29:45,912 INFO L93 Difference]: Finished difference Result 47 states and 66 transitions. [2021-11-22 15:29:45,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-22 15:29:45,916 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-22 15:29:45,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:29:45,926 INFO L225 Difference]: With dead ends: 47 [2021-11-22 15:29:45,926 INFO L226 Difference]: Without dead ends: 21 [2021-11-22 15:29:45,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-22 15:29:45,935 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-22 15:29:45,937 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-22 15:29:45,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-22 15:29:45,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-22 15:29:45,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:29:45,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-11-22 15:29:45,984 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 15 [2021-11-22 15:29:45,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:29:45,984 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-11-22 15:29:45,984 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:29:45,985 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-11-22 15:29:45,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-22 15:29:45,985 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:29:45,986 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:29:45,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-22 15:29:45,986 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:29:45,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:29:45,987 INFO L85 PathProgramCache]: Analyzing trace with hash -1896542740, now seen corresponding path program 1 times [2021-11-22 15:29:45,987 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:29:45,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618420882] [2021-11-22 15:29:45,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:29:45,988 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:29:46,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:29:46,058 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:29:46,058 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:29:46,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618420882] [2021-11-22 15:29:46,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [618420882] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-22 15:29:46,059 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-22 15:29:46,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-22 15:29:46,059 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849567312] [2021-11-22 15:29:46,060 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-22 15:29:46,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-22 15:29:46,062 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:29:46,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-22 15:29:46,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-22 15:29:46,064 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:29:46,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:29:46,129 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2021-11-22 15:29:46,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-22 15:29:46,131 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-22 15:29:46,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:29:46,132 INFO L225 Difference]: With dead ends: 39 [2021-11-22 15:29:46,132 INFO L226 Difference]: Without dead ends: 23 [2021-11-22 15:29:46,132 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-22 15:29:46,135 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-22 15:29:46,136 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 34 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-22 15:29:46,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-22 15:29:46,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-11-22 15:29:46,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:29:46,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2021-11-22 15:29:46,148 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 15 [2021-11-22 15:29:46,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:29:46,148 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2021-11-22 15:29:46,148 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:29:46,149 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2021-11-22 15:29:46,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-22 15:29:46,149 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:29:46,150 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:29:46,150 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-22 15:29:46,150 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:29:46,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:29:46,151 INFO L85 PathProgramCache]: Analyzing trace with hash -66597874, now seen corresponding path program 1 times [2021-11-22 15:29:46,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:29:46,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1176319556] [2021-11-22 15:29:46,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:29:46,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:29:46,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:29:46,240 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 15:29:46,241 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:29:46,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1176319556] [2021-11-22 15:29:46,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1176319556] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-22 15:29:46,241 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-22 15:29:46,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-22 15:29:46,242 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687847704] [2021-11-22 15:29:46,242 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-22 15:29:46,242 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-22 15:29:46,243 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:29:46,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-22 15:29:46,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-22 15:29:46,244 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:29:46,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:29:46,307 INFO L93 Difference]: Finished difference Result 43 states and 53 transitions. [2021-11-22 15:29:46,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-22 15:29:46,308 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-22 15:29:46,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:29:46,309 INFO L225 Difference]: With dead ends: 43 [2021-11-22 15:29:46,309 INFO L226 Difference]: Without dead ends: 30 [2021-11-22 15:29:46,310 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-22 15:29:46,312 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 20 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-22 15:29:46,313 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 15 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-22 15:29:46,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-22 15:29:46,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 26. [2021-11-22 15:29:46,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.2) internal successors, (30), 25 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:29:46,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-11-22 15:29:46,320 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 17 [2021-11-22 15:29:46,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:29:46,321 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-11-22 15:29:46,321 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:29:46,322 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-11-22 15:29:46,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-22 15:29:46,323 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:29:46,323 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:29:46,323 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-22 15:29:46,324 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:29:46,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:29:46,325 INFO L85 PathProgramCache]: Analyzing trace with hash -2060422634, now seen corresponding path program 1 times [2021-11-22 15:29:46,325 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:29:46,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682256313] [2021-11-22 15:29:46,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:29:46,326 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:29:46,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:29:46,427 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-22 15:29:46,428 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:29:46,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682256313] [2021-11-22 15:29:46,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [682256313] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:29:46,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [480844175] [2021-11-22 15:29:46,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:29:46,429 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:29:46,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:29:46,431 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:29:46,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-22 15:29:46,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:29:46,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-22 15:29:46,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:29:46,789 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-22 15:29:46,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:29:46,934 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-22 15:29:46,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [480844175] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:29:46,935 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:29:46,935 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-22 15:29:46,936 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057215947] [2021-11-22 15:29:46,936 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:29:46,937 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-22 15:29:46,937 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:29:46,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-22 15:29:46,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2021-11-22 15:29:46,938 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:29:47,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:29:47,023 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2021-11-22 15:29:47,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-22 15:29:47,026 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-22 15:29:47,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:29:47,027 INFO L225 Difference]: With dead ends: 49 [2021-11-22 15:29:47,027 INFO L226 Difference]: Without dead ends: 29 [2021-11-22 15:29:47,028 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=22, Unknown=0, NotChecked=0, Total=42 [2021-11-22 15:29:47,030 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 4 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-22 15:29:47,031 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 45 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-22 15:29:47,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-22 15:29:47,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2021-11-22 15:29:47,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.1851851851851851) internal successors, (32), 27 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:29:47,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2021-11-22 15:29:47,039 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 25 [2021-11-22 15:29:47,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:29:47,040 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2021-11-22 15:29:47,040 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:29:47,040 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2021-11-22 15:29:47,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-22 15:29:47,042 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:29:47,042 INFO L514 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] [2021-11-22 15:29:47,071 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-22 15:29:47,266 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:29:47,267 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:29:47,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:29:47,267 INFO L85 PathProgramCache]: Analyzing trace with hash -959615560, now seen corresponding path program 2 times [2021-11-22 15:29:47,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:29:47,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [847097515] [2021-11-22 15:29:47,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:29:47,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:29:47,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:29:47,379 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-22 15:29:47,379 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:29:47,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [847097515] [2021-11-22 15:29:47,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [847097515] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:29:47,380 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1699286567] [2021-11-22 15:29:47,381 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-22 15:29:47,381 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:29:47,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:29:47,384 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:29:47,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-22 15:29:47,447 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-22 15:29:47,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:29:47,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-22 15:29:47,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:29:47,556 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-22 15:29:47,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:29:47,645 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-22 15:29:47,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1699286567] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:29:47,646 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:29:47,646 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-22 15:29:47,647 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374008001] [2021-11-22 15:29:47,647 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:29:47,648 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-22 15:29:47,648 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:29:47,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-22 15:29:47,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2021-11-22 15:29:47,650 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:29:47,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:29:47,748 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2021-11-22 15:29:47,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-22 15:29:47,749 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-11-22 15:29:47,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:29:47,750 INFO L225 Difference]: With dead ends: 56 [2021-11-22 15:29:47,750 INFO L226 Difference]: Without dead ends: 40 [2021-11-22 15:29:47,751 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=40, Unknown=0, NotChecked=0, Total=72 [2021-11-22 15:29:47,752 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 33 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-22 15:29:47,753 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 15 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-22 15:29:47,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-22 15:29:47,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 36. [2021-11-22 15:29:47,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 35 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:29:47,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2021-11-22 15:29:47,761 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 27 [2021-11-22 15:29:47,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:29:47,761 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2021-11-22 15:29:47,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:29:47,762 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2021-11-22 15:29:47,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-22 15:29:47,763 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:29:47,764 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:29:47,803 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-22 15:29:47,992 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:29:47,992 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:29:48,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:29:48,000 INFO L85 PathProgramCache]: Analyzing trace with hash -2048824896, now seen corresponding path program 3 times [2021-11-22 15:29:48,000 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:29:48,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1708804425] [2021-11-22 15:29:48,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:29:48,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:29:48,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:29:49,671 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:29:49,671 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:29:49,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1708804425] [2021-11-22 15:29:49,672 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1708804425] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:29:49,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [484048910] [2021-11-22 15:29:49,672 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-22 15:29:49,672 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:29:49,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:29:49,674 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:29:49,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-22 15:29:49,735 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-22 15:29:49,736 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:29:49,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-22 15:29:49,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:29:49,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-22 15:29:52,822 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-22 15:29:52,823 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 26 treesize of output 26 [2021-11-22 15:29:53,199 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:29:53,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:30:04,190 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 89 treesize of output 81 [2021-11-22 15:30:04,217 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-22 15:30:04,218 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 263 treesize of output 231 [2021-11-22 15:30:04,766 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:30:04,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [484048910] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:30:04,766 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:30:04,767 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 29, 29] total 73 [2021-11-22 15:30:04,767 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080145596] [2021-11-22 15:30:04,767 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:30:04,769 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-22 15:30:04,769 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:30:04,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-22 15:30:04,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=400, Invalid=4856, Unknown=0, NotChecked=0, Total=5256 [2021-11-22 15:30:04,775 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand has 73 states, 73 states have (on average 1.3287671232876712) internal successors, (97), 73 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:30:09,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:30:09,902 INFO L93 Difference]: Finished difference Result 100 states and 115 transitions. [2021-11-22 15:30:09,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-22 15:30:09,903 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.3287671232876712) internal successors, (97), 73 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-22 15:30:09,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:30:09,908 INFO L225 Difference]: With dead ends: 100 [2021-11-22 15:30:09,910 INFO L226 Difference]: Without dead ends: 94 [2021-11-22 15:30:09,916 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 18 SyntacticMatches, 11 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3617 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=865, Invalid=11345, Unknown=0, NotChecked=0, Total=12210 [2021-11-22 15:30:09,920 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 62 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 278 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 710 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 278 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 403 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-22 15:30:09,923 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 124 Invalid, 710 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 278 Invalid, 0 Unknown, 403 Unchecked, 0.3s Time] [2021-11-22 15:30:09,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-22 15:30:09,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 65. [2021-11-22 15:30:09,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.1875) internal successors, (76), 64 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:30:09,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 76 transitions. [2021-11-22 15:30:09,942 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 76 transitions. Word has length 35 [2021-11-22 15:30:09,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:30:09,943 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 76 transitions. [2021-11-22 15:30:09,943 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 1.3287671232876712) internal successors, (97), 73 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:30:09,944 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 76 transitions. [2021-11-22 15:30:09,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-22 15:30:09,948 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:30:09,948 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:30:09,988 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-22 15:30:10,175 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:30:10,176 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:30:10,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:30:10,177 INFO L85 PathProgramCache]: Analyzing trace with hash -1772469278, now seen corresponding path program 4 times [2021-11-22 15:30:10,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:30:10,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377872734] [2021-11-22 15:30:10,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:30:10,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:30:10,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:30:10,291 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-22 15:30:10,291 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:30:10,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [377872734] [2021-11-22 15:30:10,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [377872734] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:30:10,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [184680925] [2021-11-22 15:30:10,293 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-22 15:30:10,293 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:30:10,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:30:10,298 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:30:10,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-22 15:30:10,343 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-22 15:30:10,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:30:10,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-22 15:30:10,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:30:10,503 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-22 15:30:10,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:30:10,650 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-22 15:30:10,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [184680925] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:30:10,651 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:30:10,651 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-22 15:30:10,652 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310022066] [2021-11-22 15:30:10,652 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:30:10,652 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-22 15:30:10,653 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:30:10,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-22 15:30:10,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2021-11-22 15:30:10,654 INFO L87 Difference]: Start difference. First operand 65 states and 76 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:30:10,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:30:10,886 INFO L93 Difference]: Finished difference Result 113 states and 130 transitions. [2021-11-22 15:30:10,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-22 15:30:10,890 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-22 15:30:10,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:30:10,891 INFO L225 Difference]: With dead ends: 113 [2021-11-22 15:30:10,892 INFO L226 Difference]: Without dead ends: 65 [2021-11-22 15:30:10,892 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=224, Unknown=0, NotChecked=0, Total=306 [2021-11-22 15:30:10,893 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 49 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 15:30:10,894 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 57 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 172 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-22 15:30:10,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-22 15:30:10,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-11-22 15:30:10,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.171875) internal successors, (75), 64 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:30:10,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 75 transitions. [2021-11-22 15:30:10,911 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 75 transitions. Word has length 37 [2021-11-22 15:30:10,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:30:10,913 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 75 transitions. [2021-11-22 15:30:10,914 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:30:10,914 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 75 transitions. [2021-11-22 15:30:10,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-22 15:30:10,921 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:30:10,921 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:30:10,954 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-22 15:30:11,121 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:30:11,122 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:30:11,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:30:11,122 INFO L85 PathProgramCache]: Analyzing trace with hash -1270817660, now seen corresponding path program 5 times [2021-11-22 15:30:11,122 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:30:11,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1206471339] [2021-11-22 15:30:11,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:30:11,123 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:30:11,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:30:11,243 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-22 15:30:11,244 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:30:11,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1206471339] [2021-11-22 15:30:11,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1206471339] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:30:11,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2014879089] [2021-11-22 15:30:11,250 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-22 15:30:11,250 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:30:11,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:30:11,252 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:30:11,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-22 15:30:11,333 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-22 15:30:11,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:30:11,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-22 15:30:11,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:30:11,498 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-22 15:30:11,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:30:11,614 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-22 15:30:11,615 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2014879089] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:30:11,615 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:30:11,615 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-22 15:30:11,615 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811028633] [2021-11-22 15:30:11,615 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:30:11,616 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-22 15:30:11,616 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:30:11,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-22 15:30:11,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2021-11-22 15:30:11,617 INFO L87 Difference]: Start difference. First operand 65 states and 75 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:30:11,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:30:11,831 INFO L93 Difference]: Finished difference Result 99 states and 115 transitions. [2021-11-22 15:30:11,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-22 15:30:11,831 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-22 15:30:11,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:30:11,832 INFO L225 Difference]: With dead ends: 99 [2021-11-22 15:30:11,832 INFO L226 Difference]: Without dead ends: 62 [2021-11-22 15:30:11,833 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=237, Unknown=0, NotChecked=0, Total=342 [2021-11-22 15:30:11,834 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 117 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 15:30:11,834 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 30 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-22 15:30:11,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-22 15:30:11,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 46. [2021-11-22 15:30:11,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.1111111111111112) internal successors, (50), 45 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:30:11,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-11-22 15:30:11,842 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 39 [2021-11-22 15:30:11,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:30:11,844 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-11-22 15:30:11,844 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:30:11,844 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-11-22 15:30:11,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-22 15:30:11,845 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:30:11,845 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:30:11,876 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-22 15:30:12,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:30:12,064 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:30:12,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:30:12,064 INFO L85 PathProgramCache]: Analyzing trace with hash -604138262, now seen corresponding path program 6 times [2021-11-22 15:30:12,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:30:12,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302008883] [2021-11-22 15:30:12,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:30:12,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:30:12,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:30:14,342 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:30:14,342 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:30:14,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302008883] [2021-11-22 15:30:14,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [302008883] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:30:14,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2134969424] [2021-11-22 15:30:14,342 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-22 15:30:14,343 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:30:14,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:30:14,343 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:30:14,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-22 15:30:14,394 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-11-22 15:30:14,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:30:14,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-22 15:30:14,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:30:16,214 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:30:16,214 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:30:21,051 INFO L354 Elim1Store]: treesize reduction 87, result has 57.8 percent of original size [2021-11-22 15:30:21,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 115 treesize of output 151 [2021-11-22 15:30:24,722 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 4 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:30:24,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2134969424] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:30:24,723 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:30:24,723 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 31, 32] total 83 [2021-11-22 15:30:24,723 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413706089] [2021-11-22 15:30:24,723 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:30:24,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-22 15:30:24,724 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:30:24,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-22 15:30:24,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=427, Invalid=6378, Unknown=1, NotChecked=0, Total=6806 [2021-11-22 15:30:24,727 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 83 states, 83 states have (on average 1.3493975903614457) internal successors, (112), 83 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:30:28,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:30:28,991 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2021-11-22 15:30:28,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-22 15:30:28,992 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 1.3493975903614457) internal successors, (112), 83 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-22 15:30:28,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:30:28,994 INFO L225 Difference]: With dead ends: 80 [2021-11-22 15:30:28,994 INFO L226 Difference]: Without dead ends: 76 [2021-11-22 15:30:28,998 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 37 SyntacticMatches, 9 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3756 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=807, Invalid=10534, Unknown=1, NotChecked=0, Total=11342 [2021-11-22 15:30:28,999 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 30 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 1890 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 2096 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 1890 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 77 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-22 15:30:29,000 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 156 Invalid, 2096 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 1890 Invalid, 0 Unknown, 77 Unchecked, 1.6s Time] [2021-11-22 15:30:29,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-22 15:30:29,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 67. [2021-11-22 15:30:29,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.121212121212121) internal successors, (74), 66 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:30:29,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 74 transitions. [2021-11-22 15:30:29,012 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 74 transitions. Word has length 45 [2021-11-22 15:30:29,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:30:29,012 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 74 transitions. [2021-11-22 15:30:29,013 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 1.3493975903614457) internal successors, (112), 83 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:30:29,013 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 74 transitions. [2021-11-22 15:30:29,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-22 15:30:29,014 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:30:29,014 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:30:29,056 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-22 15:30:29,239 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:30:29,240 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:30:29,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:30:29,240 INFO L85 PathProgramCache]: Analyzing trace with hash -703050612, now seen corresponding path program 7 times [2021-11-22 15:30:29,240 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:30:29,241 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530567155] [2021-11-22 15:30:29,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:30:29,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:30:29,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:30:29,388 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-22 15:30:29,389 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:30:29,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530567155] [2021-11-22 15:30:29,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1530567155] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:30:29,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1467223507] [2021-11-22 15:30:29,389 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-22 15:30:29,390 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:30:29,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:30:29,391 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:30:29,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-22 15:30:29,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:30:29,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-22 15:30:29,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:30:29,656 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-22 15:30:29,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:30:29,779 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-22 15:30:29,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1467223507] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:30:29,780 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:30:29,780 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-22 15:30:29,780 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349058128] [2021-11-22 15:30:29,781 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:30:29,781 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-22 15:30:29,781 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:30:29,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-22 15:30:29,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2021-11-22 15:30:29,783 INFO L87 Difference]: Start difference. First operand 67 states and 74 transitions. Second operand has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:30:30,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:30:30,051 INFO L93 Difference]: Finished difference Result 132 states and 146 transitions. [2021-11-22 15:30:30,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-22 15:30:30,052 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-22 15:30:30,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:30:30,053 INFO L225 Difference]: With dead ends: 132 [2021-11-22 15:30:30,054 INFO L226 Difference]: Without dead ends: 70 [2021-11-22 15:30:30,054 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=118, Invalid=344, Unknown=0, NotChecked=0, Total=462 [2021-11-22 15:30:30,055 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 47 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 15:30:30,056 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 57 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-22 15:30:30,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-22 15:30:30,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2021-11-22 15:30:30,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.1176470588235294) internal successors, (76), 68 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:30:30,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 76 transitions. [2021-11-22 15:30:30,077 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 76 transitions. Word has length 47 [2021-11-22 15:30:30,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:30:30,078 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 76 transitions. [2021-11-22 15:30:30,078 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:30:30,078 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 76 transitions. [2021-11-22 15:30:30,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-22 15:30:30,079 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:30:30,080 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:30:30,129 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-22 15:30:30,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-22 15:30:30,307 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:30:30,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:30:30,308 INFO L85 PathProgramCache]: Analyzing trace with hash 1331298990, now seen corresponding path program 8 times [2021-11-22 15:30:30,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:30:30,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1173859612] [2021-11-22 15:30:30,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:30:30,308 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:30:30,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:30:30,438 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-22 15:30:30,439 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:30:30,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1173859612] [2021-11-22 15:30:30,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1173859612] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:30:30,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [251829303] [2021-11-22 15:30:30,439 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-22 15:30:30,439 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:30:30,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:30:30,445 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:30:30,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-22 15:30:30,503 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-22 15:30:30,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:30:30,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-22 15:30:30,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:30:30,677 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-22 15:30:30,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:30:30,812 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-22 15:30:30,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [251829303] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:30:30,812 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:30:30,812 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-22 15:30:30,813 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048705459] [2021-11-22 15:30:30,813 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:30:30,813 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-22 15:30:30,813 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:30:30,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-22 15:30:30,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2021-11-22 15:30:30,814 INFO L87 Difference]: Start difference. First operand 69 states and 76 transitions. Second operand has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:30:31,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:30:31,092 INFO L93 Difference]: Finished difference Result 101 states and 113 transitions. [2021-11-22 15:30:31,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-22 15:30:31,092 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-22 15:30:31,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:30:31,093 INFO L225 Difference]: With dead ends: 101 [2021-11-22 15:30:31,093 INFO L226 Difference]: Without dead ends: 60 [2021-11-22 15:30:31,094 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=152, Invalid=354, Unknown=0, NotChecked=0, Total=506 [2021-11-22 15:30:31,095 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 101 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 15:30:31,095 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 35 Invalid, 283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-22 15:30:31,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-22 15:30:31,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2021-11-22 15:30:31,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 55 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:30:31,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2021-11-22 15:30:31,104 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 49 [2021-11-22 15:30:31,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:30:31,104 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2021-11-22 15:30:31,105 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 17 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:30:31,105 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2021-11-22 15:30:31,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-22 15:30:31,106 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:30:31,106 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:30:31,135 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-22 15:30:31,319 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:30:31,320 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:30:31,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:30:31,320 INFO L85 PathProgramCache]: Analyzing trace with hash -2047700076, now seen corresponding path program 9 times [2021-11-22 15:30:31,321 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:30:31,321 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461719289] [2021-11-22 15:30:31,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:30:31,321 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:30:31,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:30:34,600 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:30:34,600 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:30:34,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461719289] [2021-11-22 15:30:34,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1461719289] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:30:34,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [748843884] [2021-11-22 15:30:34,601 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-22 15:30:34,601 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:30:34,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:30:34,602 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:30:34,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-22 15:30:34,658 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-22 15:30:34,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:30:34,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 82 conjunts are in the unsatisfiable core [2021-11-22 15:30:34,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:30:34,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-22 15:30:41,837 INFO L354 Elim1Store]: treesize reduction 26, result has 67.1 percent of original size [2021-11-22 15:30:41,837 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 54 treesize of output 80 [2021-11-22 15:30:42,491 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 7 proven. 64 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-22 15:30:42,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:31:51,534 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 337 treesize of output 305 [2021-11-22 15:31:51,963 INFO L354 Elim1Store]: treesize reduction 445, result has 5.3 percent of original size [2021-11-22 15:31:51,967 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 32107 treesize of output 19075 [2021-11-22 15:31:52,291 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: BigInteger out of long range [2021-11-22 15:31:52,291 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-22 15:31:52,291 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2021-11-22 15:31:52,291 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236036827] [2021-11-22 15:31:52,291 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-22 15:31:52,292 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-22 15:31:52,292 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:31:52,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-22 15:31:52,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=14110, Unknown=14, NotChecked=0, Total=15252 [2021-11-22 15:31:52,297 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand has 45 states, 45 states have (on average 1.2222222222222223) internal successors, (55), 45 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:31:59,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:31:59,992 INFO L93 Difference]: Finished difference Result 96 states and 103 transitions. [2021-11-22 15:31:59,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-22 15:31:59,993 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.2222222222222223) internal successors, (55), 45 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-22 15:31:59,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:31:59,994 INFO L225 Difference]: With dead ends: 96 [2021-11-22 15:31:59,994 INFO L226 Difference]: Without dead ends: 92 [2021-11-22 15:31:59,999 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6446 ImplicationChecksByTransitivity, 67.7s TimeCoverageRelationStatistics Valid=1775, Invalid=20561, Unknown=14, NotChecked=0, Total=22350 [2021-11-22 15:31:59,999 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 17 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 1118 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 1204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 1118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-22 15:31:59,999 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 107 Invalid, 1204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 1118 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-22 15:32:00,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-22 15:32:00,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 81. [2021-11-22 15:32:00,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 80 states have (on average 1.1) internal successors, (88), 80 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:32:00,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 88 transitions. [2021-11-22 15:32:00,017 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 88 transitions. Word has length 55 [2021-11-22 15:32:00,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:32:00,018 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 88 transitions. [2021-11-22 15:32:00,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.2222222222222223) internal successors, (55), 45 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:32:00,018 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 88 transitions. [2021-11-22 15:32:00,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-22 15:32:00,019 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:32:00,019 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:32:00,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-22 15:32:00,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:32:00,223 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:32:00,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:32:00,224 INFO L85 PathProgramCache]: Analyzing trace with hash -691517258, now seen corresponding path program 10 times [2021-11-22 15:32:00,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:32:00,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857972921] [2021-11-22 15:32:00,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:32:00,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:32:00,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:32:00,393 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 18 proven. 23 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-22 15:32:00,393 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:32:00,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857972921] [2021-11-22 15:32:00,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [857972921] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:32:00,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [681865765] [2021-11-22 15:32:00,394 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-22 15:32:00,394 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:32:00,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:32:00,396 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:32:00,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-22 15:32:00,460 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-22 15:32:00,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:32:00,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-22 15:32:00,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:32:00,708 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 25 proven. 16 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-22 15:32:00,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:32:00,850 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 25 proven. 16 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-22 15:32:00,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [681865765] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:32:00,850 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:32:00,851 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-22 15:32:00,851 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675680310] [2021-11-22 15:32:00,851 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:32:00,852 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-22 15:32:00,852 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:32:00,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-22 15:32:00,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2021-11-22 15:32:00,853 INFO L87 Difference]: Start difference. First operand 81 states and 88 transitions. Second operand has 20 states, 20 states have (on average 2.75) internal successors, (55), 20 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:32:01,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:32:01,185 INFO L93 Difference]: Finished difference Result 160 states and 174 transitions. [2021-11-22 15:32:01,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-22 15:32:01,186 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.75) internal successors, (55), 20 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-22 15:32:01,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:32:01,187 INFO L225 Difference]: With dead ends: 160 [2021-11-22 15:32:01,187 INFO L226 Difference]: Without dead ends: 84 [2021-11-22 15:32:01,188 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=489, Unknown=0, NotChecked=0, Total=650 [2021-11-22 15:32:01,189 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 51 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 321 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 15:32:01,189 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 59 Invalid, 372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 321 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-22 15:32:01,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-22 15:32:01,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2021-11-22 15:32:01,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.0975609756097562) internal successors, (90), 82 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:32:01,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 90 transitions. [2021-11-22 15:32:01,202 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 90 transitions. Word has length 57 [2021-11-22 15:32:01,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:32:01,202 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 90 transitions. [2021-11-22 15:32:01,203 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.75) internal successors, (55), 20 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:32:01,203 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 90 transitions. [2021-11-22 15:32:01,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-22 15:32:01,204 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:32:01,204 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:32:01,238 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-22 15:32:01,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:32:01,417 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:32:01,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:32:01,418 INFO L85 PathProgramCache]: Analyzing trace with hash -801227688, now seen corresponding path program 11 times [2021-11-22 15:32:01,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:32:01,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152077879] [2021-11-22 15:32:01,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:32:01,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:32:01,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:32:01,590 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 9 proven. 32 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-22 15:32:01,590 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:32:01,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152077879] [2021-11-22 15:32:01,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [152077879] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:32:01,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1646591213] [2021-11-22 15:32:01,591 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-22 15:32:01,591 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:32:01,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:32:01,592 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:32:01,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-22 15:32:01,801 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-22 15:32:01,801 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:32:01,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-22 15:32:01,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:32:02,081 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 16 proven. 25 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-22 15:32:02,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:32:02,252 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 16 proven. 25 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-22 15:32:02,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1646591213] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:32:02,252 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:32:02,253 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-22 15:32:02,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306575544] [2021-11-22 15:32:02,253 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:32:02,254 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-22 15:32:02,254 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:32:02,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-22 15:32:02,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=281, Unknown=0, NotChecked=0, Total=380 [2021-11-22 15:32:02,255 INFO L87 Difference]: Start difference. First operand 83 states and 90 transitions. Second operand has 20 states, 20 states have (on average 3.3) internal successors, (66), 20 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:32:02,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:32:02,588 INFO L93 Difference]: Finished difference Result 119 states and 131 transitions. [2021-11-22 15:32:02,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-22 15:32:02,588 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.3) internal successors, (66), 20 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-22 15:32:02,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:32:02,589 INFO L225 Difference]: With dead ends: 119 [2021-11-22 15:32:02,589 INFO L226 Difference]: Without dead ends: 70 [2021-11-22 15:32:02,590 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 109 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2021-11-22 15:32:02,591 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 117 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 15:32:02,591 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 39 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-22 15:32:02,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-22 15:32:02,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 66. [2021-11-22 15:32:02,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.0769230769230769) internal successors, (70), 65 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:32:02,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2021-11-22 15:32:02,601 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 59 [2021-11-22 15:32:02,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:32:02,601 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2021-11-22 15:32:02,601 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.3) internal successors, (66), 20 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:32:02,601 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2021-11-22 15:32:02,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-22 15:32:02,602 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:32:02,602 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:32:02,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-22 15:32:02,815 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-22 15:32:02,816 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:32:02,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:32:02,817 INFO L85 PathProgramCache]: Analyzing trace with hash -1079638594, now seen corresponding path program 12 times [2021-11-22 15:32:02,817 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:32:02,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1007896558] [2021-11-22 15:32:02,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:32:02,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:32:02,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:32:07,493 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 125 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:32:07,494 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:32:07,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1007896558] [2021-11-22 15:32:07,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1007896558] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:32:07,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1635018905] [2021-11-22 15:32:07,494 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-22 15:32:07,494 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:32:07,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:32:07,495 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:32:07,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-22 15:32:07,563 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-11-22 15:32:07,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:32:07,566 WARN L261 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 102 conjunts are in the unsatisfiable core [2021-11-22 15:32:07,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:32:16,747 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-22 15:32:16,747 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 26 treesize of output 26 [2021-11-22 15:32:17,338 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 3 proven. 121 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 15:32:17,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:32:42,684 INFO L354 Elim1Store]: treesize reduction 387, result has 41.2 percent of original size [2021-11-22 15:32:42,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 193 treesize of output 317 [2021-11-22 15:32:45,416 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 109 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-22 15:32:45,416 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1635018905] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:32:45,417 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:32:45,417 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 51, 46] total 141 [2021-11-22 15:32:45,417 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353103622] [2021-11-22 15:32:45,417 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:32:45,417 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 141 states [2021-11-22 15:32:45,417 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:32:45,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 141 interpolants. [2021-11-22 15:32:45,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=759, Invalid=18981, Unknown=0, NotChecked=0, Total=19740 [2021-11-22 15:32:45,419 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand has 141 states, 141 states have (on average 1.2411347517730495) internal successors, (175), 141 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:33:00,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:33:00,674 INFO L93 Difference]: Finished difference Result 108 states and 115 transitions. [2021-11-22 15:33:00,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-11-22 15:33:00,675 INFO L78 Accepts]: Start accepts. Automaton has has 141 states, 141 states have (on average 1.2411347517730495) internal successors, (175), 141 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-22 15:33:00,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:33:00,676 INFO L225 Difference]: With dead ends: 108 [2021-11-22 15:33:00,676 INFO L226 Difference]: Without dead ends: 104 [2021-11-22 15:33:00,682 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 38 SyntacticMatches, 6 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9238 ImplicationChecksByTransitivity, 43.0s TimeCoverageRelationStatistics Valid=1531, Invalid=37871, Unknown=0, NotChecked=0, Total=39402 [2021-11-22 15:33:00,683 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 27 mSDsluCounter, 265 mSDsCounter, 0 mSdLazyCounter, 1049 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 2494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 1049 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1390 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-22 15:33:00,683 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 274 Invalid, 2494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 1049 Invalid, 0 Unknown, 1390 Unchecked, 0.9s Time] [2021-11-22 15:33:00,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-22 15:33:00,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 95. [2021-11-22 15:33:00,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0851063829787233) internal successors, (102), 94 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:33:00,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 102 transitions. [2021-11-22 15:33:00,698 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 102 transitions. Word has length 65 [2021-11-22 15:33:00,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:33:00,699 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 102 transitions. [2021-11-22 15:33:00,699 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 141 states, 141 states have (on average 1.2411347517730495) internal successors, (175), 141 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:33:00,699 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 102 transitions. [2021-11-22 15:33:00,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-22 15:33:00,700 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:33:00,700 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:33:00,724 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-11-22 15:33:00,903 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-22 15:33:00,904 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:33:00,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:33:00,905 INFO L85 PathProgramCache]: Analyzing trace with hash 1902631008, now seen corresponding path program 13 times [2021-11-22 15:33:00,905 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:33:00,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1862737560] [2021-11-22 15:33:00,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:33:00,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:33:00,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:33:01,075 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 27 proven. 34 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-22 15:33:01,076 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:33:01,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1862737560] [2021-11-22 15:33:01,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1862737560] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:33:01,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1861336936] [2021-11-22 15:33:01,076 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-22 15:33:01,076 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:33:01,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:33:01,078 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:33:01,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-22 15:33:01,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:33:01,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-22 15:33:01,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:33:01,384 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 36 proven. 25 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-22 15:33:01,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:33:01,528 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 36 proven. 25 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-22 15:33:01,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1861336936] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:33:01,528 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:33:01,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-22 15:33:01,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504872157] [2021-11-22 15:33:01,529 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:33:01,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-22 15:33:01,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:33:01,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-22 15:33:01,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=382, Unknown=0, NotChecked=0, Total=506 [2021-11-22 15:33:01,530 INFO L87 Difference]: Start difference. First operand 95 states and 102 transitions. Second operand has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 23 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:33:01,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:33:01,838 INFO L93 Difference]: Finished difference Result 188 states and 202 transitions. [2021-11-22 15:33:01,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-22 15:33:01,839 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 23 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-22 15:33:01,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:33:01,839 INFO L225 Difference]: With dead ends: 188 [2021-11-22 15:33:01,840 INFO L226 Difference]: Without dead ends: 98 [2021-11-22 15:33:01,840 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=659, Unknown=0, NotChecked=0, Total=870 [2021-11-22 15:33:01,841 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 85 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 15:33:01,842 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 66 Invalid, 391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-22 15:33:01,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-11-22 15:33:01,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2021-11-22 15:33:01,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.0833333333333333) internal successors, (104), 96 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:33:01,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 104 transitions. [2021-11-22 15:33:01,854 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 104 transitions. Word has length 67 [2021-11-22 15:33:01,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:33:01,855 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 104 transitions. [2021-11-22 15:33:01,855 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 23 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:33:01,855 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 104 transitions. [2021-11-22 15:33:01,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-22 15:33:01,856 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:33:01,856 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:33:01,885 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-22 15:33:02,071 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-22 15:33:02,072 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:33:02,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:33:02,072 INFO L85 PathProgramCache]: Analyzing trace with hash 721627522, now seen corresponding path program 14 times [2021-11-22 15:33:02,072 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:33:02,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [312137082] [2021-11-22 15:33:02,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:33:02,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:33:02,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:33:02,223 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-22 15:33:02,223 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:33:02,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [312137082] [2021-11-22 15:33:02,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [312137082] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:33:02,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [197093769] [2021-11-22 15:33:02,228 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-22 15:33:02,228 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:33:02,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:33:02,229 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:33:02,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-22 15:33:02,282 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-22 15:33:02,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:33:02,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-22 15:33:02,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:33:02,564 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 25 proven. 36 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-22 15:33:02,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:33:02,750 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 25 proven. 36 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2021-11-22 15:33:02,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [197093769] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:33:02,751 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:33:02,751 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-22 15:33:02,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724824459] [2021-11-22 15:33:02,752 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:33:02,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-22 15:33:02,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:33:02,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-22 15:33:02,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=377, Unknown=0, NotChecked=0, Total=506 [2021-11-22 15:33:02,755 INFO L87 Difference]: Start difference. First operand 97 states and 104 transitions. Second operand has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 23 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:33:03,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:33:03,046 INFO L93 Difference]: Finished difference Result 137 states and 149 transitions. [2021-11-22 15:33:03,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-22 15:33:03,047 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 23 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-22 15:33:03,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:33:03,047 INFO L225 Difference]: With dead ends: 137 [2021-11-22 15:33:03,047 INFO L226 Difference]: Without dead ends: 80 [2021-11-22 15:33:03,048 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 128 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=273, Invalid=657, Unknown=0, NotChecked=0, Total=930 [2021-11-22 15:33:03,048 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 122 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 359 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-22 15:33:03,049 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 36 Invalid, 359 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-22 15:33:03,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-22 15:33:03,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 76. [2021-11-22 15:33:03,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 75 states have (on average 1.0666666666666667) internal successors, (80), 75 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:33:03,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2021-11-22 15:33:03,066 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 69 [2021-11-22 15:33:03,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:33:03,066 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2021-11-22 15:33:03,066 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 23 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:33:03,066 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2021-11-22 15:33:03,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-22 15:33:03,067 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:33:03,067 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:33:03,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-22 15:33:03,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-22 15:33:03,268 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:33:03,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:33:03,268 INFO L85 PathProgramCache]: Analyzing trace with hash 209029992, now seen corresponding path program 15 times [2021-11-22 15:33:03,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:33:03,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654471117] [2021-11-22 15:33:03,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:33:03,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:33:03,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:33:10,196 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 1 proven. 179 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:33:10,197 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:33:10,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654471117] [2021-11-22 15:33:10,197 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1654471117] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:33:10,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1745199678] [2021-11-22 15:33:10,197 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-22 15:33:10,198 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:33:10,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:33:10,205 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:33:10,206 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-22 15:33:10,273 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-22 15:33:10,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:33:10,276 WARN L261 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 121 conjunts are in the unsatisfiable core [2021-11-22 15:33:10,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:33:10,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-22 15:33:26,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:33:26,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:33:26,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:33:26,319 INFO L354 Elim1Store]: treesize reduction 98, result has 44.6 percent of original size [2021-11-22 15:33:26,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 3 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 63 treesize of output 97 [2021-11-22 15:33:27,130 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 7 proven. 164 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-22 15:33:27,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:34:07,566 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-22 15:34:07,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1745199678] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:34:07,566 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:34:07,567 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 58, 54] total 166 [2021-11-22 15:34:07,567 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722399061] [2021-11-22 15:34:07,567 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:34:07,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 166 states [2021-11-22 15:34:07,568 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:34:07,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 166 interpolants. [2021-11-22 15:34:07,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1121, Invalid=26268, Unknown=1, NotChecked=0, Total=27390 [2021-11-22 15:34:07,572 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand has 166 states, 166 states have (on average 1.2108433734939759) internal successors, (201), 166 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:36,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:34:36,274 INFO L93 Difference]: Finished difference Result 125 states and 132 transitions. [2021-11-22 15:34:36,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-11-22 15:34:36,275 INFO L78 Accepts]: Start accepts. Automaton has has 166 states, 166 states have (on average 1.2108433734939759) internal successors, (201), 166 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-22 15:34:36,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:34:36,275 INFO L225 Difference]: With dead ends: 125 [2021-11-22 15:34:36,276 INFO L226 Difference]: Without dead ends: 121 [2021-11-22 15:34:36,278 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 42 SyntacticMatches, 7 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12698 ImplicationChecksByTransitivity, 78.2s TimeCoverageRelationStatistics Valid=2313, Invalid=53146, Unknown=1, NotChecked=0, Total=55460 [2021-11-22 15:34:36,278 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 57 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 1109 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 256 SdHoareTripleChecker+Invalid, 2992 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 1109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1842 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-22 15:34:36,278 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 256 Invalid, 2992 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 1109 Invalid, 0 Unknown, 1842 Unchecked, 1.1s Time] [2021-11-22 15:34:36,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-11-22 15:34:36,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 109. [2021-11-22 15:34:36,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 108 states have (on average 1.0740740740740742) internal successors, (116), 108 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:36,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 116 transitions. [2021-11-22 15:34:36,291 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 116 transitions. Word has length 75 [2021-11-22 15:34:36,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:34:36,292 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 116 transitions. [2021-11-22 15:34:36,292 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 166 states, 166 states have (on average 1.2108433734939759) internal successors, (201), 166 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:36,292 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 116 transitions. [2021-11-22 15:34:36,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-22 15:34:36,293 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:34:36,293 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:34:36,313 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-22 15:34:36,495 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-22 15:34:36,496 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:34:36,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:34:36,496 INFO L85 PathProgramCache]: Analyzing trace with hash -932406390, now seen corresponding path program 16 times [2021-11-22 15:34:36,496 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:34:36,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [260330305] [2021-11-22 15:34:36,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:34:36,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:34:36,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:34:36,684 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 38 proven. 47 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-22 15:34:36,684 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:34:36,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [260330305] [2021-11-22 15:34:36,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [260330305] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:34:36,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [536973491] [2021-11-22 15:34:36,685 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-22 15:34:36,685 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:34:36,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:34:36,686 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:34:36,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-22 15:34:36,743 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-22 15:34:36,743 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:34:36,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-22 15:34:36,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:34:37,084 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 49 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-22 15:34:37,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:34:37,271 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 49 proven. 36 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-11-22 15:34:37,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [536973491] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:34:37,272 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:34:37,272 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-22 15:34:37,272 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101463207] [2021-11-22 15:34:37,272 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:34:37,273 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-22 15:34:37,273 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:34:37,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-22 15:34:37,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=493, Unknown=0, NotChecked=0, Total=650 [2021-11-22 15:34:37,273 INFO L87 Difference]: Start difference. First operand 109 states and 116 transitions. Second operand has 26 states, 26 states have (on average 2.576923076923077) internal successors, (67), 26 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:37,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:34:37,673 INFO L93 Difference]: Finished difference Result 216 states and 230 transitions. [2021-11-22 15:34:37,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-22 15:34:37,673 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.576923076923077) internal successors, (67), 26 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2021-11-22 15:34:37,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:34:37,674 INFO L225 Difference]: With dead ends: 216 [2021-11-22 15:34:37,675 INFO L226 Difference]: Without dead ends: 112 [2021-11-22 15:34:37,676 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=268, Invalid=854, Unknown=0, NotChecked=0, Total=1122 [2021-11-22 15:34:37,679 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 77 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 486 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 486 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-22 15:34:37,679 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 78 Invalid, 547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 486 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-22 15:34:37,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-22 15:34:37,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2021-11-22 15:34:37,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.0727272727272728) internal successors, (118), 110 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:37,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 118 transitions. [2021-11-22 15:34:37,696 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 118 transitions. Word has length 77 [2021-11-22 15:34:37,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:34:37,697 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 118 transitions. [2021-11-22 15:34:37,697 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.576923076923077) internal successors, (67), 26 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:37,697 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 118 transitions. [2021-11-22 15:34:37,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-22 15:34:37,698 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:34:37,698 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:34:37,736 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-22 15:34:37,923 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:34:37,924 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:34:37,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:34:37,924 INFO L85 PathProgramCache]: Analyzing trace with hash -1623823828, now seen corresponding path program 17 times [2021-11-22 15:34:37,924 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:34:37,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [894720219] [2021-11-22 15:34:37,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:34:37,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:34:37,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:34:38,099 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 25 proven. 60 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-22 15:34:38,099 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:34:38,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [894720219] [2021-11-22 15:34:38,099 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [894720219] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:34:38,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861710989] [2021-11-22 15:34:38,099 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-22 15:34:38,100 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:34:38,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:34:38,104 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:34:38,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-22 15:34:38,523 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-11-22 15:34:38,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:34:38,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-22 15:34:38,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:34:38,902 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 49 proven. 36 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-22 15:34:38,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:34:39,130 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 49 proven. 36 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-22 15:34:39,130 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861710989] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:34:39,130 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:34:39,131 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 39 [2021-11-22 15:34:39,131 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295969459] [2021-11-22 15:34:39,131 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:34:39,132 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-22 15:34:39,132 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:34:39,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-22 15:34:39,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=1265, Unknown=0, NotChecked=0, Total=1482 [2021-11-22 15:34:39,132 INFO L87 Difference]: Start difference. First operand 111 states and 118 transitions. Second operand has 39 states, 39 states have (on average 2.58974358974359) internal successors, (101), 39 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:39,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:34:39,688 INFO L93 Difference]: Finished difference Result 155 states and 167 transitions. [2021-11-22 15:34:39,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-22 15:34:39,689 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.58974358974359) internal successors, (101), 39 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 79 [2021-11-22 15:34:39,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:34:39,689 INFO L225 Difference]: With dead ends: 155 [2021-11-22 15:34:39,690 INFO L226 Difference]: Without dead ends: 90 [2021-11-22 15:34:39,690 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 584 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=408, Invalid=1944, Unknown=0, NotChecked=0, Total=2352 [2021-11-22 15:34:39,691 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 236 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 547 mSolverCounterSat, 208 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 236 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 755 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 208 IncrementalHoareTripleChecker+Valid, 547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-22 15:34:39,691 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [236 Valid, 49 Invalid, 755 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [208 Valid, 547 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-22 15:34:39,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-22 15:34:39,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 86. [2021-11-22 15:34:39,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.0588235294117647) internal successors, (90), 85 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:39,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 90 transitions. [2021-11-22 15:34:39,700 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 90 transitions. Word has length 79 [2021-11-22 15:34:39,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:34:39,700 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 90 transitions. [2021-11-22 15:34:39,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.58974358974359) internal successors, (101), 39 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:34:39,700 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 90 transitions. [2021-11-22 15:34:39,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-22 15:34:39,701 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:34:39,701 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:34:39,721 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-22 15:34:39,901 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:34:39,902 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:34:39,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:34:39,902 INFO L85 PathProgramCache]: Analyzing trace with hash -1053375342, now seen corresponding path program 18 times [2021-11-22 15:34:39,902 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:34:39,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [945209859] [2021-11-22 15:34:39,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:34:39,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:34:40,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:34:46,986 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:34:46,986 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:34:46,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [945209859] [2021-11-22 15:34:46,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [945209859] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:34:46,986 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1663949171] [2021-11-22 15:34:46,986 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-22 15:34:46,986 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:34:46,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:34:46,987 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:34:46,988 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-22 15:34:47,135 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-11-22 15:34:47,136 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:34:47,141 WARN L261 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 134 conjunts are in the unsatisfiable core [2021-11-22 15:34:47,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:35:10,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:35:10,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:35:10,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:35:10,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:35:10,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:35:10,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:35:10,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:35:10,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:35:10,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:35:10,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:35:10,860 INFO L354 Elim1Store]: treesize reduction 332, result has 37.7 percent of original size [2021-11-22 15:35:10,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 10 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 99 treesize of output 223 [2021-11-22 15:35:11,833 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 13 proven. 196 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-22 15:35:11,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:36:08,222 INFO L354 Elim1Store]: treesize reduction 1183, result has 20.9 percent of original size [2021-11-22 15:36:08,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 289 treesize of output 371 [2021-11-22 15:36:12,808 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 209 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-22 15:36:12,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1663949171] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:36:12,808 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:36:12,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 64, 62] total 191 [2021-11-22 15:36:12,809 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285364102] [2021-11-22 15:36:12,809 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:36:12,809 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 191 states [2021-11-22 15:36:12,809 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:36:12,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 191 interpolants. [2021-11-22 15:36:12,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1694, Invalid=34596, Unknown=0, NotChecked=0, Total=36290 [2021-11-22 15:36:12,811 INFO L87 Difference]: Start difference. First operand 86 states and 90 transitions. Second operand has 191 states, 191 states have (on average 1.1884816753926701) internal successors, (227), 191 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:36:58,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:36:58,850 INFO L93 Difference]: Finished difference Result 141 states and 148 transitions. [2021-11-22 15:36:58,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-11-22 15:36:58,851 INFO L78 Accepts]: Start accepts. Automaton has has 191 states, 191 states have (on average 1.1884816753926701) internal successors, (227), 191 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-22 15:36:58,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:36:58,852 INFO L225 Difference]: With dead ends: 141 [2021-11-22 15:36:58,852 INFO L226 Difference]: Without dead ends: 137 [2021-11-22 15:36:58,854 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 50 SyntacticMatches, 5 SemanticMatches, 269 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15474 ImplicationChecksByTransitivity, 120.0s TimeCoverageRelationStatistics Valid=3408, Invalid=69762, Unknown=0, NotChecked=0, Total=73170 [2021-11-22 15:36:58,855 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 82 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 1736 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 4070 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 1736 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2205 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-22 15:36:58,856 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 267 Invalid, 4070 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 1736 Invalid, 0 Unknown, 2205 Unchecked, 1.3s Time] [2021-11-22 15:36:58,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-11-22 15:36:58,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 123. [2021-11-22 15:36:58,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.0655737704918034) internal successors, (130), 122 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:36:58,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 130 transitions. [2021-11-22 15:36:58,872 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 130 transitions. Word has length 85 [2021-11-22 15:36:58,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:36:58,873 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 130 transitions. [2021-11-22 15:36:58,873 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 191 states, 191 states have (on average 1.1884816753926701) internal successors, (227), 191 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:36:58,873 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 130 transitions. [2021-11-22 15:36:58,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-22 15:36:58,874 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:36:58,875 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:36:58,901 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-22 15:36:59,083 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-22 15:36:59,084 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:36:59,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:36:59,084 INFO L85 PathProgramCache]: Analyzing trace with hash 1371812404, now seen corresponding path program 19 times [2021-11-22 15:36:59,084 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:36:59,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504549370] [2021-11-22 15:36:59,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:36:59,084 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:36:59,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:36:59,291 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 51 proven. 62 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-22 15:36:59,291 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:36:59,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504549370] [2021-11-22 15:36:59,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504549370] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:36:59,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [392640961] [2021-11-22 15:36:59,291 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-22 15:36:59,292 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:36:59,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:36:59,296 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:36:59,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-22 15:36:59,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:36:59,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-22 15:36:59,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:36:59,778 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 64 proven. 49 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-22 15:36:59,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:36:59,992 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 64 proven. 49 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2021-11-22 15:36:59,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [392640961] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:36:59,993 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:36:59,993 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-22 15:36:59,993 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640506438] [2021-11-22 15:36:59,993 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:36:59,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-22 15:36:59,994 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:36:59,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-22 15:36:59,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=618, Unknown=0, NotChecked=0, Total=812 [2021-11-22 15:36:59,994 INFO L87 Difference]: Start difference. First operand 123 states and 130 transitions. Second operand has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 29 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:37:00,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:37:00,407 INFO L93 Difference]: Finished difference Result 244 states and 258 transitions. [2021-11-22 15:37:00,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-22 15:37:00,407 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 29 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 87 [2021-11-22 15:37:00,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:37:00,409 INFO L225 Difference]: With dead ends: 244 [2021-11-22 15:37:00,409 INFO L226 Difference]: Without dead ends: 126 [2021-11-22 15:37:00,409 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=332, Invalid=1074, Unknown=0, NotChecked=0, Total=1406 [2021-11-22 15:37:00,410 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 96 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 421 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 421 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-22 15:37:00,411 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 57 Invalid, 521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 421 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-22 15:37:00,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-22 15:37:00,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2021-11-22 15:37:00,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 124 states have (on average 1.064516129032258) internal successors, (132), 124 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:37:00,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 132 transitions. [2021-11-22 15:37:00,424 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 132 transitions. Word has length 87 [2021-11-22 15:37:00,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:37:00,424 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 132 transitions. [2021-11-22 15:37:00,424 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 29 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:37:00,425 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 132 transitions. [2021-11-22 15:37:00,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-22 15:37:00,425 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:37:00,426 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:37:00,446 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-22 15:37:00,626 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:37:00,626 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:37:00,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:37:00,627 INFO L85 PathProgramCache]: Analyzing trace with hash 1105043030, now seen corresponding path program 20 times [2021-11-22 15:37:00,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:37:00,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1304297809] [2021-11-22 15:37:00,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:37:00,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:37:00,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:37:00,855 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-11-22 15:37:00,855 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:37:00,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1304297809] [2021-11-22 15:37:00,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1304297809] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:37:00,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [982932792] [2021-11-22 15:37:00,855 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-22 15:37:00,855 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:37:00,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:37:00,857 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:37:00,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-22 15:37:00,930 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-22 15:37:00,930 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:37:00,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-22 15:37:00,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:37:01,297 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 49 proven. 64 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-11-22 15:37:01,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:37:01,509 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 49 proven. 64 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-11-22 15:37:01,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [982932792] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:37:01,509 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-22 15:37:01,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-22 15:37:01,510 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995055344] [2021-11-22 15:37:01,510 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-22 15:37:01,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-22 15:37:01,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:37:01,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-22 15:37:01,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=611, Unknown=0, NotChecked=0, Total=812 [2021-11-22 15:37:01,511 INFO L87 Difference]: Start difference. First operand 125 states and 132 transitions. Second operand has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 29 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:37:01,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:37:01,927 INFO L93 Difference]: Finished difference Result 173 states and 185 transitions. [2021-11-22 15:37:01,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-22 15:37:01,927 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 29 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 89 [2021-11-22 15:37:01,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:37:01,928 INFO L225 Difference]: With dead ends: 173 [2021-11-22 15:37:01,928 INFO L226 Difference]: Without dead ends: 100 [2021-11-22 15:37:01,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 166 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=430, Invalid=1052, Unknown=0, NotChecked=0, Total=1482 [2021-11-22 15:37:01,929 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 201 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 306 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-22 15:37:01,930 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [201 Valid, 33 Invalid, 474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 306 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-22 15:37:01,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-22 15:37:01,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 96. [2021-11-22 15:37:01,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.0526315789473684) internal successors, (100), 95 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:37:01,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 100 transitions. [2021-11-22 15:37:01,945 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 100 transitions. Word has length 89 [2021-11-22 15:37:01,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:37:01,945 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 100 transitions. [2021-11-22 15:37:01,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 29 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:37:01,946 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 100 transitions. [2021-11-22 15:37:01,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-22 15:37:01,946 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:37:01,947 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:37:01,968 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-22 15:37:02,152 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-22 15:37:02,152 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:37:02,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:37:02,153 INFO L85 PathProgramCache]: Analyzing trace with hash 238506300, now seen corresponding path program 21 times [2021-11-22 15:37:02,153 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-22 15:37:02,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96302880] [2021-11-22 15:37:02,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:37:02,153 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-22 15:37:02,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:37:11,449 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 9 proven. 311 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:37:11,449 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-22 15:37:11,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96302880] [2021-11-22 15:37:11,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [96302880] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-22 15:37:11,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2114276089] [2021-11-22 15:37:11,450 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-22 15:37:11,450 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-22 15:37:11,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:37:11,451 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-22 15:37:11,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-22 15:37:11,564 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-22 15:37:11,564 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:37:11,568 WARN L261 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 156 conjunts are in the unsatisfiable core [2021-11-22 15:37:11,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:37:40,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:37:40,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:37:40,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:37:40,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:37:40,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:37:40,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:37:40,731 INFO L354 Elim1Store]: treesize reduction 198, result has 40.2 percent of original size [2021-11-22 15:37:40,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 6 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 81 treesize of output 153 [2021-11-22 15:37:41,697 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 9 proven. 295 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-22 15:37:41,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:38:34,058 WARN L228 Executor]: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) stderr output: (error "out of memory") [2021-11-22 15:38:34,059 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") [2021-11-22 15:38:34,059 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-22 15:38:34,059 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80] total 80 [2021-11-22 15:38:34,060 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355728953] [2021-11-22 15:38:34,060 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-22 15:38:34,060 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-22 15:38:34,060 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-22 15:38:34,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-22 15:38:34,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1450, Invalid=36379, Unknown=1, NotChecked=0, Total=37830 [2021-11-22 15:38:34,062 INFO L87 Difference]: Start difference. First operand 96 states and 100 transitions. Second operand has 80 states, 80 states have (on average 1.1875) internal successors, (95), 80 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:38:34,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-22 15:38:34,064 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 33 SyntacticMatches, 5 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11315 ImplicationChecksByTransitivity, 77.9s TimeCoverageRelationStatistics Valid=1450, Invalid=36379, Unknown=1, NotChecked=0, Total=37830 [2021-11-22 15:38:34,059 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 101 [2021-11-22 15:38:34,065 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 1 SdHoareTripleChecker+Invalid, 1 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-22 15:38:34,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 1 Invalid, 1 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-22 15:38:34,088 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-22 15:38:34,280 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-22 15:38:34,280 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker@6805ec68 at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.assertCodeBlock(IncrementalHoareTripleChecker.java:360) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.prepareAssertionStackAndAddTransition(IncrementalHoareTripleChecker.java:206) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.checkInternal(IncrementalHoareTripleChecker.java:131) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ChainingHoareTripleChecker$ProtectedHtc.checkInternal(ChainingHoareTripleChecker.java:455) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ChainingHoareTripleChecker.checkInternal(ChainingHoareTripleChecker.java:103) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.CachingHoareTripleChecker.checkInternal(CachingHoareTripleChecker.java:95) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton$InternalSuccessorComputationHelper.computeSuccWithSolver(AbstractInterpolantAutomaton.java:357) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.DeterministicInterpolantAutomaton.addOtherSuccessors(DeterministicInterpolantAutomaton.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:78) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:233) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.TotalizeNwa.internalSuccessors(TotalizeNwa.java:213) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ComplementDeterministicNwa.internalSuccessors(ComplementDeterministicNwa.java:121) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:216) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:208) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.addInternalsAndSuccessors(NestedWordAutomatonReachableStates.java:1058) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.(NestedWordAutomatonReachableStates.java:960) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates.(NestedWordAutomatonReachableStates.java:182) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.computeDifference(Difference.java:137) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.(Difference.java:90) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.computeAutomataDifference(BasicCegarLoop.java:868) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.refineAbstraction(BasicCegarLoop.java:784) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.refineAbstractionInternal(AbstractCegarLoop.java:462) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:420) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-22 15:38:34,283 INFO L158 Benchmark]: Toolchain (without parser) took 529753.30ms. Allocated memory was 88.1MB in the beginning and 226.5MB in the end (delta: 138.4MB). Free memory was 52.6MB in the beginning and 139.4MB in the end (delta: -86.8MB). Peak memory consumption was 50.8MB. Max. memory is 16.1GB. [2021-11-22 15:38:34,283 INFO L158 Benchmark]: CDTParser took 0.38ms. Allocated memory is still 88.1MB. Free memory is still 68.6MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-22 15:38:34,284 INFO L158 Benchmark]: CACSL2BoogieTranslator took 405.01ms. Allocated memory was 88.1MB in the beginning and 107.0MB in the end (delta: 18.9MB). Free memory was 52.3MB in the beginning and 83.2MB in the end (delta: -30.9MB). Peak memory consumption was 7.8MB. Max. memory is 16.1GB. [2021-11-22 15:38:34,284 INFO L158 Benchmark]: Boogie Procedure Inliner took 48.10ms. Allocated memory is still 107.0MB. Free memory was 83.2MB in the beginning and 81.7MB in the end (delta: 1.6MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-22 15:38:34,284 INFO L158 Benchmark]: Boogie Preprocessor took 52.77ms. Allocated memory is still 107.0MB. Free memory was 81.5MB in the beginning and 80.4MB in the end (delta: 1.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-22 15:38:34,284 INFO L158 Benchmark]: RCFGBuilder took 439.84ms. Allocated memory is still 107.0MB. Free memory was 80.4MB in the beginning and 70.0MB in the end (delta: 10.4MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-22 15:38:34,285 INFO L158 Benchmark]: TraceAbstraction took 528800.84ms. Allocated memory was 107.0MB in the beginning and 226.5MB in the end (delta: 119.5MB). Free memory was 69.6MB in the beginning and 139.4MB in the end (delta: -69.8MB). Peak memory consumption was 51.3MB. Max. memory is 16.1GB. [2021-11-22 15:38:34,286 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.38ms. Allocated memory is still 88.1MB. Free memory is still 68.6MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 405.01ms. Allocated memory was 88.1MB in the beginning and 107.0MB in the end (delta: 18.9MB). Free memory was 52.3MB in the beginning and 83.2MB in the end (delta: -30.9MB). Peak memory consumption was 7.8MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 48.10ms. Allocated memory is still 107.0MB. Free memory was 83.2MB in the beginning and 81.7MB in the end (delta: 1.6MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 52.77ms. Allocated memory is still 107.0MB. Free memory was 81.5MB in the beginning and 80.4MB in the end (delta: 1.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 439.84ms. Allocated memory is still 107.0MB. Free memory was 80.4MB in the beginning and 70.0MB in the end (delta: 10.4MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 528800.84ms. Allocated memory was 107.0MB in the beginning and 226.5MB in the end (delta: 119.5MB). Free memory was 69.6MB in the beginning and 139.4MB in the end (delta: -69.8MB). Peak memory consumption was 51.3MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker@6805ec68 de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker@6805ec68: de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/config/AutomizerReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_m2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/config/svcomp-Reach-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 64e2b591ee375a99f019d69fefe326e9fd46db25f76a67e4f3bee333adbec68f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-22 15:38:36,634 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-22 15:38:36,637 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-22 15:38:36,691 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-22 15:38:36,692 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-22 15:38:36,697 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-22 15:38:36,700 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-22 15:38:36,707 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-22 15:38:36,710 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-22 15:38:36,716 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-22 15:38:36,718 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-22 15:38:36,720 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-22 15:38:36,720 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-22 15:38:36,723 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-22 15:38:36,726 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-22 15:38:36,751 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-22 15:38:36,753 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-22 15:38:36,755 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-22 15:38:36,757 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-22 15:38:36,768 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-22 15:38:36,770 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-22 15:38:36,771 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-22 15:38:36,775 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-22 15:38:36,777 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-22 15:38:36,787 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-22 15:38:36,787 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-22 15:38:36,788 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-22 15:38:36,791 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-22 15:38:36,791 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-22 15:38:36,792 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-22 15:38:36,793 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-22 15:38:36,794 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-22 15:38:36,796 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-22 15:38:36,797 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-22 15:38:36,799 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-22 15:38:36,799 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-22 15:38:36,800 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-22 15:38:36,801 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-22 15:38:36,801 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-22 15:38:36,803 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-22 15:38:36,804 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-22 15:38:36,805 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/config/svcomp-Reach-32bit-Automizer_Bitvector.epf [2021-11-22 15:38:36,854 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-22 15:38:36,855 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-22 15:38:36,856 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-22 15:38:36,856 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-22 15:38:36,858 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-22 15:38:36,859 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-22 15:38:36,859 INFO L138 SettingsManager]: * Use SBE=true [2021-11-22 15:38:36,859 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-22 15:38:36,859 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-22 15:38:36,860 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-22 15:38:36,861 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-22 15:38:36,861 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-22 15:38:36,861 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-22 15:38:36,862 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-22 15:38:36,862 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-22 15:38:36,862 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-22 15:38:36,863 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-22 15:38:36,863 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-22 15:38:36,863 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-22 15:38:36,863 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-22 15:38:36,863 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-22 15:38:36,864 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-22 15:38:36,864 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-22 15:38:36,864 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-22 15:38:36,864 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-22 15:38:36,865 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-22 15:38:36,865 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-22 15:38:36,866 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-22 15:38:36,866 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-11-22 15:38:36,866 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-22 15:38:36,866 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-22 15:38:36,867 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-22 15:38:36,867 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-22 15:38:36,867 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-22 15:38:36,867 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-22 15:38:36,868 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 64e2b591ee375a99f019d69fefe326e9fd46db25f76a67e4f3bee333adbec68f [2021-11-22 15:38:37,289 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-22 15:38:37,314 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-22 15:38:37,317 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-22 15:38:37,319 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-22 15:38:37,323 INFO L275 PluginConnector]: CDTParser initialized [2021-11-22 15:38:37,328 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/../../sv-benchmarks/c/array-crafted/zero_sum_m2.c [2021-11-22 15:38:37,407 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/data/23a960885/13d070acb0534d4eb9d8afc937d14802/FLAG25b4eadb4 [2021-11-22 15:38:38,012 INFO L306 CDTParser]: Found 1 translation units. [2021-11-22 15:38:38,013 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/sv-benchmarks/c/array-crafted/zero_sum_m2.c [2021-11-22 15:38:38,022 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/data/23a960885/13d070acb0534d4eb9d8afc937d14802/FLAG25b4eadb4 [2021-11-22 15:38:38,355 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/data/23a960885/13d070acb0534d4eb9d8afc937d14802 [2021-11-22 15:38:38,360 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-22 15:38:38,362 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-22 15:38:38,367 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-22 15:38:38,367 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-22 15:38:38,371 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-22 15:38:38,372 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 03:38:38" (1/1) ... [2021-11-22 15:38:38,374 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c47acea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:38:38, skipping insertion in model container [2021-11-22 15:38:38,374 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 03:38:38" (1/1) ... [2021-11-22 15:38:38,384 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-22 15:38:38,411 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-22 15:38:38,598 WARN L230 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_34217607-af62-4809-8ae5-3e69daa80041/sv-benchmarks/c/array-crafted/zero_sum_m2.c[402,415] [2021-11-22 15:38:38,620 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-22 15:38:38,632 INFO L203 MainTranslator]: Completed pre-run [2021-11-22 15:38:38,647 WARN L230 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_34217607-af62-4809-8ae5-3e69daa80041/sv-benchmarks/c/array-crafted/zero_sum_m2.c[402,415] [2021-11-22 15:38:38,658 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-22 15:38:38,711 INFO L208 MainTranslator]: Completed translation [2021-11-22 15:38:38,716 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:38:38 WrapperNode [2021-11-22 15:38:38,716 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-22 15:38:38,717 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-22 15:38:38,717 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-22 15:38:38,718 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-22 15:38:38,725 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:38:38" (1/1) ... [2021-11-22 15:38:38,733 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:38:38" (1/1) ... [2021-11-22 15:38:38,758 INFO L137 Inliner]: procedures = 17, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 81 [2021-11-22 15:38:38,758 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-22 15:38:38,759 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-22 15:38:38,759 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-22 15:38:38,759 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-22 15:38:38,769 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:38:38" (1/1) ... [2021-11-22 15:38:38,769 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:38:38" (1/1) ... [2021-11-22 15:38:38,773 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:38:38" (1/1) ... [2021-11-22 15:38:38,774 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:38:38" (1/1) ... [2021-11-22 15:38:38,782 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:38:38" (1/1) ... [2021-11-22 15:38:38,806 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:38:38" (1/1) ... [2021-11-22 15:38:38,808 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:38:38" (1/1) ... [2021-11-22 15:38:38,811 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-22 15:38:38,812 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-22 15:38:38,812 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-22 15:38:38,812 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-22 15:38:38,813 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:38:38" (1/1) ... [2021-11-22 15:38:38,821 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-22 15:38:38,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 [2021-11-22 15:38:38,857 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-22 15:38:38,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-22 15:38:38,916 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-22 15:38:38,917 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-22 15:38:38,917 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-22 15:38:38,917 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE2 [2021-11-22 15:38:38,917 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-22 15:38:38,917 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-22 15:38:38,918 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE2 [2021-11-22 15:38:38,918 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-22 15:38:39,007 INFO L236 CfgBuilder]: Building ICFG [2021-11-22 15:38:39,008 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-22 15:38:39,224 INFO L277 CfgBuilder]: Performing block encoding [2021-11-22 15:38:39,231 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-22 15:38:39,231 INFO L301 CfgBuilder]: Removed 5 assume(true) statements. [2021-11-22 15:38:39,233 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 03:38:39 BoogieIcfgContainer [2021-11-22 15:38:39,234 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-22 15:38:39,236 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-22 15:38:39,236 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-22 15:38:39,239 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-22 15:38:39,243 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 03:38:38" (1/3) ... [2021-11-22 15:38:39,244 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b38af28 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 03:38:39, skipping insertion in model container [2021-11-22 15:38:39,244 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 03:38:38" (2/3) ... [2021-11-22 15:38:39,244 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b38af28 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 03:38:39, skipping insertion in model container [2021-11-22 15:38:39,245 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 03:38:39" (3/3) ... [2021-11-22 15:38:39,246 INFO L111 eAbstractionObserver]: Analyzing ICFG zero_sum_m2.c [2021-11-22 15:38:39,259 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-22 15:38:39,271 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-22 15:38:39,370 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-22 15:38:39,392 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-22 15:38:39,393 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-22 15:38:39,409 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:38:39,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-22 15:38:39,416 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:38:39,417 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:38:39,418 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:38:39,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:38:39,431 INFO L85 PathProgramCache]: Analyzing trace with hash -1122046426, now seen corresponding path program 1 times [2021-11-22 15:38:39,445 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 15:38:39,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [346093057] [2021-11-22 15:38:39,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:38:39,449 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 15:38:39,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 15:38:39,464 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 15:38:39,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-22 15:38:39,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:38:39,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-22 15:38:39,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:38:39,693 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:38:39,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:38:39,785 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:38:39,786 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 15:38:39,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [346093057] [2021-11-22 15:38:39,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [346093057] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-22 15:38:39,787 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-22 15:38:39,789 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-22 15:38:39,791 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315337059] [2021-11-22 15:38:39,794 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-22 15:38:39,799 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-22 15:38:39,800 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 15:38:39,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-22 15:38:39,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-22 15:38:39,849 INFO L87 Difference]: Start difference. First operand has 26 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 25 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:38:39,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:38:39,878 INFO L93 Difference]: Finished difference Result 47 states and 66 transitions. [2021-11-22 15:38:39,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-22 15:38:39,881 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-22 15:38:39,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:38:39,897 INFO L225 Difference]: With dead ends: 47 [2021-11-22 15:38:39,898 INFO L226 Difference]: Without dead ends: 21 [2021-11-22 15:38:39,906 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-22 15:38:39,913 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-22 15:38:39,915 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-22 15:38:39,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-22 15:38:39,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-22 15:38:39,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:38:39,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-11-22 15:38:39,963 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 15 [2021-11-22 15:38:39,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:38:39,964 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-11-22 15:38:39,964 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:38:39,965 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-11-22 15:38:39,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-22 15:38:39,967 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:38:39,967 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:38:39,984 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-22 15:38:40,179 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 15:38:40,180 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:38:40,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:38:40,181 INFO L85 PathProgramCache]: Analyzing trace with hash -1896542740, now seen corresponding path program 1 times [2021-11-22 15:38:40,182 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 15:38:40,182 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1715592095] [2021-11-22 15:38:40,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:38:40,183 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 15:38:40,183 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 15:38:40,184 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 15:38:40,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-22 15:38:40,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:38:40,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-22 15:38:40,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:38:40,349 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:38:40,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:38:40,433 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:38:40,434 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 15:38:40,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1715592095] [2021-11-22 15:38:40,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1715592095] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-22 15:38:40,435 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-22 15:38:40,436 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 5 [2021-11-22 15:38:40,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948307053] [2021-11-22 15:38:40,439 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-22 15:38:40,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-22 15:38:40,448 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 15:38:40,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-22 15:38:40,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-22 15:38:40,450 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:38:40,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:38:40,546 INFO L93 Difference]: Finished difference Result 32 states and 39 transitions. [2021-11-22 15:38:40,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-22 15:38:40,550 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-22 15:38:40,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:38:40,552 INFO L225 Difference]: With dead ends: 32 [2021-11-22 15:38:40,553 INFO L226 Difference]: Without dead ends: 28 [2021-11-22 15:38:40,554 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-22 15:38:40,557 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 3 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-22 15:38:40,559 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 72 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-22 15:38:40,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-22 15:38:40,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-22 15:38:40,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 27 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:38:40,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2021-11-22 15:38:40,578 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 15 [2021-11-22 15:38:40,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:38:40,579 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2021-11-22 15:38:40,580 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:38:40,580 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2021-11-22 15:38:40,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-22 15:38:40,582 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:38:40,582 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:38:40,601 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-22 15:38:40,801 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 15:38:40,802 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:38:40,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:38:40,802 INFO L85 PathProgramCache]: Analyzing trace with hash -1458205426, now seen corresponding path program 1 times [2021-11-22 15:38:40,803 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 15:38:40,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [785950281] [2021-11-22 15:38:40,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:38:40,804 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 15:38:40,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 15:38:40,805 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 15:38:40,810 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-22 15:38:40,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:38:40,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-22 15:38:40,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:38:40,915 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 15:38:40,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:38:40,964 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 15:38:40,964 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 15:38:40,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [785950281] [2021-11-22 15:38:40,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [785950281] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-22 15:38:40,965 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-22 15:38:40,966 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-22 15:38:40,966 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061569418] [2021-11-22 15:38:40,966 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-22 15:38:40,967 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-22 15:38:40,967 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 15:38:40,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-22 15:38:40,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-22 15:38:40,968 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 4 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:38:41,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:38:41,030 INFO L93 Difference]: Finished difference Result 54 states and 69 transitions. [2021-11-22 15:38:41,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-22 15:38:41,031 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 4 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-22 15:38:41,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:38:41,032 INFO L225 Difference]: With dead ends: 54 [2021-11-22 15:38:41,032 INFO L226 Difference]: Without dead ends: 31 [2021-11-22 15:38:41,033 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-22 15:38:41,034 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 3 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-22 15:38:41,035 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 34 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-22 15:38:41,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-22 15:38:41,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-22 15:38:41,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 30 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:38:41,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2021-11-22 15:38:41,043 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 17 [2021-11-22 15:38:41,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:38:41,043 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2021-11-22 15:38:41,043 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 4 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:38:41,044 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2021-11-22 15:38:41,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-22 15:38:41,045 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:38:41,045 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:38:41,061 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-22 15:38:41,257 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 15:38:41,257 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:38:41,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:38:41,258 INFO L85 PathProgramCache]: Analyzing trace with hash 668215250, now seen corresponding path program 1 times [2021-11-22 15:38:41,258 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 15:38:41,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2111890672] [2021-11-22 15:38:41,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:38:41,259 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 15:38:41,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 15:38:41,260 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 15:38:41,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-22 15:38:41,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:38:41,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-22 15:38:41,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:38:41,467 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 15:38:41,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:38:41,694 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 15:38:41,694 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 15:38:41,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2111890672] [2021-11-22 15:38:41,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2111890672] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:38:41,695 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-22 15:38:41,695 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-11-22 15:38:41,695 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261903924] [2021-11-22 15:38:41,695 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-22 15:38:41,696 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-22 15:38:41,696 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 15:38:41,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-22 15:38:41,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2021-11-22 15:38:41,698 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:38:42,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:38:42,107 INFO L93 Difference]: Finished difference Result 78 states and 102 transitions. [2021-11-22 15:38:42,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-22 15:38:42,108 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-22 15:38:42,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:38:42,109 INFO L225 Difference]: With dead ends: 78 [2021-11-22 15:38:42,109 INFO L226 Difference]: Without dead ends: 59 [2021-11-22 15:38:42,110 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2021-11-22 15:38:42,111 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 85 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-22 15:38:42,111 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 59 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-22 15:38:42,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-22 15:38:42,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2021-11-22 15:38:42,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.18) internal successors, (59), 50 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:38:42,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 59 transitions. [2021-11-22 15:38:42,130 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 59 transitions. Word has length 21 [2021-11-22 15:38:42,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:38:42,130 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 59 transitions. [2021-11-22 15:38:42,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:38:42,131 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 59 transitions. [2021-11-22 15:38:42,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-22 15:38:42,133 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:38:42,133 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:38:42,148 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (5)] Ended with exit code 0 [2021-11-22 15:38:42,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 15:38:42,345 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:38:42,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:38:42,345 INFO L85 PathProgramCache]: Analyzing trace with hash 354027738, now seen corresponding path program 1 times [2021-11-22 15:38:42,346 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 15:38:42,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1812511748] [2021-11-22 15:38:42,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-22 15:38:42,346 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 15:38:42,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 15:38:42,348 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 15:38:42,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-22 15:38:42,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-22 15:38:42,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-22 15:38:42,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:38:42,683 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-22 15:38:42,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:38:43,006 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-22 15:38:43,006 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 15:38:43,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1812511748] [2021-11-22 15:38:43,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1812511748] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:38:43,007 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-22 15:38:43,007 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2021-11-22 15:38:43,007 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542781668] [2021-11-22 15:38:43,008 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-22 15:38:43,008 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-22 15:38:43,008 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 15:38:43,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-22 15:38:43,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=167, Unknown=0, NotChecked=0, Total=240 [2021-11-22 15:38:43,010 INFO L87 Difference]: Start difference. First operand 51 states and 59 transitions. Second operand has 16 states, 16 states have (on average 2.5625) internal successors, (41), 16 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:38:43,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:38:43,801 INFO L93 Difference]: Finished difference Result 121 states and 143 transitions. [2021-11-22 15:38:43,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-22 15:38:43,802 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.5625) internal successors, (41), 16 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-22 15:38:43,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:38:43,804 INFO L225 Difference]: With dead ends: 121 [2021-11-22 15:38:43,804 INFO L226 Difference]: Without dead ends: 105 [2021-11-22 15:38:43,804 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=196, Invalid=454, Unknown=0, NotChecked=0, Total=650 [2021-11-22 15:38:43,805 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 210 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 367 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-22 15:38:43,806 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 84 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 367 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-22 15:38:43,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-22 15:38:43,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 36. [2021-11-22 15:38:43,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 35 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:38:43,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2021-11-22 15:38:43,816 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 29 [2021-11-22 15:38:43,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:38:43,816 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2021-11-22 15:38:43,817 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.5625) internal successors, (41), 16 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:38:43,817 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2021-11-22 15:38:43,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-22 15:38:43,818 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:38:43,818 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:38:43,833 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-22 15:38:44,029 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 15:38:44,030 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:38:44,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:38:44,030 INFO L85 PathProgramCache]: Analyzing trace with hash -2048824896, now seen corresponding path program 2 times [2021-11-22 15:38:44,031 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 15:38:44,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1915490528] [2021-11-22 15:38:44,031 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-22 15:38:44,031 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 15:38:44,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 15:38:44,032 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 15:38:44,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-22 15:38:45,343 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-22 15:38:45,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:38:45,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-22 15:38:45,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:38:46,564 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-11-22 15:38:46,565 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 41 treesize of output 21 [2021-11-22 15:38:46,680 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-22 15:38:46,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:38:51,595 INFO L354 Elim1Store]: treesize reduction 39, result has 52.4 percent of original size [2021-11-22 15:38:51,595 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 47 treesize of output 63 [2021-11-22 15:39:00,015 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-22 15:39:00,016 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 15:39:00,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1915490528] [2021-11-22 15:39:00,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1915490528] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:39:00,016 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-22 15:39:00,016 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 31 [2021-11-22 15:39:00,016 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704449788] [2021-11-22 15:39:00,017 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-22 15:39:00,017 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-22 15:39:00,017 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 15:39:00,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-22 15:39:00,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=849, Unknown=1, NotChecked=0, Total=930 [2021-11-22 15:39:00,019 INFO L87 Difference]: Start difference. First operand 36 states and 40 transitions. Second operand has 31 states, 31 states have (on average 1.7419354838709677) internal successors, (54), 31 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:39:02,648 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-22 15:39:07,644 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-22 15:39:10,153 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-22 15:39:12,831 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-22 15:39:13,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:39:13,477 INFO L93 Difference]: Finished difference Result 62 states and 69 transitions. [2021-11-22 15:39:13,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-22 15:39:13,478 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.7419354838709677) internal successors, (54), 31 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-22 15:39:13,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:39:13,479 INFO L225 Difference]: With dead ends: 62 [2021-11-22 15:39:13,480 INFO L226 Difference]: Without dead ends: 58 [2021-11-22 15:39:13,481 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 35 SyntacticMatches, 4 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=90, Invalid=965, Unknown=1, NotChecked=0, Total=1056 [2021-11-22 15:39:13,482 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 5 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 796 mSolverCounterSat, 4 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 796 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 7 IncrementalHoareTripleChecker+Unchecked, 11.1s IncrementalHoareTripleChecker+Time [2021-11-22 15:39:13,483 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 154 Invalid, 811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 796 Invalid, 4 Unknown, 7 Unchecked, 11.1s Time] [2021-11-22 15:39:13,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-22 15:39:13,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 53. [2021-11-22 15:39:13,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.1538461538461537) internal successors, (60), 52 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:39:13,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2021-11-22 15:39:13,497 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 35 [2021-11-22 15:39:13,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:39:13,498 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2021-11-22 15:39:13,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.7419354838709677) internal successors, (54), 31 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:39:13,498 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2021-11-22 15:39:13,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-22 15:39:13,500 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:39:13,500 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:39:13,532 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-22 15:39:13,719 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 15:39:13,719 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:39:13,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:39:13,720 INFO L85 PathProgramCache]: Analyzing trace with hash -1772469278, now seen corresponding path program 3 times [2021-11-22 15:39:13,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 15:39:13,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2043446079] [2021-11-22 15:39:13,720 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-22 15:39:13,720 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 15:39:13,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 15:39:13,727 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 15:39:13,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-22 15:39:13,871 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-22 15:39:13,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:39:13,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-22 15:39:13,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:39:14,239 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-22 15:39:14,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:39:14,876 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-22 15:39:14,876 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 15:39:14,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2043446079] [2021-11-22 15:39:14,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2043446079] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:39:14,877 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-22 15:39:14,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 18 [2021-11-22 15:39:14,877 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079724410] [2021-11-22 15:39:14,877 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-22 15:39:14,878 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-22 15:39:14,878 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 15:39:14,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-22 15:39:14,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=234, Unknown=0, NotChecked=0, Total=306 [2021-11-22 15:39:14,879 INFO L87 Difference]: Start difference. First operand 53 states and 60 transitions. Second operand has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 18 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:39:15,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:39:15,703 INFO L93 Difference]: Finished difference Result 104 states and 118 transitions. [2021-11-22 15:39:15,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-22 15:39:15,704 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 18 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-22 15:39:15,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:39:15,705 INFO L225 Difference]: With dead ends: 104 [2021-11-22 15:39:15,705 INFO L226 Difference]: Without dead ends: 56 [2021-11-22 15:39:15,706 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=127, Invalid=379, Unknown=0, NotChecked=0, Total=506 [2021-11-22 15:39:15,707 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 67 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 381 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-22 15:39:15,708 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 59 Invalid, 381 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-22 15:39:15,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-22 15:39:15,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-11-22 15:39:15,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.1481481481481481) internal successors, (62), 54 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:39:15,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 62 transitions. [2021-11-22 15:39:15,720 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 62 transitions. Word has length 37 [2021-11-22 15:39:15,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:39:15,720 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 62 transitions. [2021-11-22 15:39:15,721 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 18 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:39:15,721 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 62 transitions. [2021-11-22 15:39:15,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-22 15:39:15,723 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:39:15,723 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:39:15,736 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (8)] Ended with exit code 0 [2021-11-22 15:39:15,927 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 15:39:15,928 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:39:15,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:39:15,929 INFO L85 PathProgramCache]: Analyzing trace with hash -1270817660, now seen corresponding path program 4 times [2021-11-22 15:39:15,929 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 15:39:15,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [103969392] [2021-11-22 15:39:15,930 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-22 15:39:15,930 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 15:39:15,930 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 15:39:15,931 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 15:39:15,936 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-22 15:39:16,056 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-22 15:39:16,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:39:16,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-22 15:39:16,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:39:16,393 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-22 15:39:16,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-22 15:39:17,006 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-22 15:39:17,007 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-22 15:39:17,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [103969392] [2021-11-22 15:39:17,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [103969392] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-22 15:39:17,007 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-22 15:39:17,007 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2021-11-22 15:39:17,007 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516376014] [2021-11-22 15:39:17,008 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-22 15:39:17,008 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-22 15:39:17,008 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-22 15:39:17,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-22 15:39:17,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=281, Unknown=0, NotChecked=0, Total=380 [2021-11-22 15:39:17,009 INFO L87 Difference]: Start difference. First operand 55 states and 62 transitions. Second operand has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:39:18,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-22 15:39:18,028 INFO L93 Difference]: Finished difference Result 122 states and 142 transitions. [2021-11-22 15:39:18,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-22 15:39:18,030 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-22 15:39:18,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-22 15:39:18,031 INFO L225 Difference]: With dead ends: 122 [2021-11-22 15:39:18,031 INFO L226 Difference]: Without dead ends: 89 [2021-11-22 15:39:18,032 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=212, Invalid=544, Unknown=0, NotChecked=0, Total=756 [2021-11-22 15:39:18,033 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 271 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 392 mSolverCounterSat, 169 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 271 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 561 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 169 IncrementalHoareTripleChecker+Valid, 392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-22 15:39:18,034 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [271 Valid, 63 Invalid, 561 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [169 Valid, 392 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-22 15:39:18,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-22 15:39:18,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 46. [2021-11-22 15:39:18,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.1111111111111112) internal successors, (50), 45 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:39:18,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-11-22 15:39:18,044 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 39 [2021-11-22 15:39:18,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-22 15:39:18,044 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-11-22 15:39:18,045 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-22 15:39:18,045 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-11-22 15:39:18,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-22 15:39:18,046 INFO L506 BasicCegarLoop]: Found error trace [2021-11-22 15:39:18,046 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-22 15:39:18,076 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-22 15:39:18,262 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 [2021-11-22 15:39:18,263 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-22 15:39:18,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-22 15:39:18,263 INFO L85 PathProgramCache]: Analyzing trace with hash -604138262, now seen corresponding path program 5 times [2021-11-22 15:39:18,264 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-22 15:39:18,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2007006262] [2021-11-22 15:39:18,264 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-22 15:39:18,264 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-22 15:39:18,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat [2021-11-22 15:39:18,265 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-22 15:39:18,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_34217607-af62-4809-8ae5-3e69daa80041/bin/uautomizer-w2VwFs6gM0/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-22 15:42:12,890 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-22 15:42:12,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-22 15:42:13,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-22 15:42:13,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-22 15:42:13,182 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 16 treesize of output 12 [2021-11-22 15:42:13,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:42:13,252 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 25 treesize of output 24 [2021-11-22 15:42:13,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:42:13,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:42:13,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-22 15:42:13,364 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-22 15:42:13,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 35 [2021-11-22 15:42:18,711 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-22 15:42:18,711 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 79 treesize of output 43 [2021-11-22 15:42:19,189 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-22 15:42:19,189 INFO L328 TraceCheckSpWp]: Computing backward predicates...