./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/MultCommutative-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/MultCommutative-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ce29b37e076ab683230ebf17073db3b7759ea39570dd2ef64322b6d43bb636cd --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-13 02:30:48,426 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-13 02:30:48,430 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-13 02:30:48,481 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-13 02:30:48,482 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-13 02:30:48,486 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-13 02:30:48,488 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-13 02:30:48,493 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-13 02:30:48,495 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-13 02:30:48,503 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-13 02:30:48,504 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-13 02:30:48,505 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-13 02:30:48,506 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-13 02:30:48,508 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-13 02:30:48,511 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-13 02:30:48,516 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-13 02:30:48,517 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-13 02:30:48,518 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-13 02:30:48,522 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-13 02:30:48,526 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-13 02:30:48,532 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-13 02:30:48,533 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-13 02:30:48,535 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-13 02:30:48,537 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-13 02:30:48,543 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-13 02:30:48,543 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-13 02:30:48,544 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-13 02:30:48,546 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-13 02:30:48,546 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-13 02:30:48,547 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-13 02:30:48,548 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-13 02:30:48,549 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-13 02:30:48,551 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-13 02:30:48,552 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-13 02:30:48,554 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-13 02:30:48,554 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-13 02:30:48,555 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-13 02:30:48,555 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-13 02:30:48,555 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-13 02:30:48,556 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-13 02:30:48,557 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-13 02:30:48,557 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-13 02:30:48,604 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-13 02:30:48,604 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-13 02:30:48,606 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-13 02:30:48,606 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-13 02:30:48,606 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-13 02:30:48,606 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-13 02:30:48,607 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-13 02:30:48,607 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-13 02:30:48,613 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-13 02:30:48,613 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-13 02:30:48,614 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-13 02:30:48,614 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-13 02:30:48,615 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-13 02:30:48,615 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-13 02:30:48,615 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-13 02:30:48,615 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-13 02:30:48,616 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-13 02:30:48,616 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-13 02:30:48,617 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-13 02:30:48,617 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-13 02:30:48,617 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-13 02:30:48,617 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-13 02:30:48,617 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-13 02:30:48,618 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-13 02:30:48,618 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-13 02:30:48,618 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-13 02:30:48,618 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-13 02:30:48,619 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-13 02:30:48,619 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-13 02:30:48,620 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-13 02:30:48,620 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-13 02:30:48,621 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 02:30:48,621 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-13 02:30:48,621 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-13 02:30:48,622 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-13 02:30:48,622 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-13 02:30:48,622 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-13 02:30:48,622 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-13 02:30:48,622 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-13 02:30:48,623 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-13 02:30:48,623 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ce29b37e076ab683230ebf17073db3b7759ea39570dd2ef64322b6d43bb636cd [2021-11-13 02:30:48,886 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-13 02:30:48,912 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-13 02:30:48,915 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-13 02:30:48,916 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-13 02:30:48,916 INFO L275 PluginConnector]: CDTParser initialized [2021-11-13 02:30:48,918 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/recursive/MultCommutative-2.c [2021-11-13 02:30:49,002 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/data/d19e9e726/9fa366c5326644b29211a5c92321e5f2/FLAG0da609fdd [2021-11-13 02:30:49,408 INFO L306 CDTParser]: Found 1 translation units. [2021-11-13 02:30:49,408 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/sv-benchmarks/c/recursive/MultCommutative-2.c [2021-11-13 02:30:49,414 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/data/d19e9e726/9fa366c5326644b29211a5c92321e5f2/FLAG0da609fdd [2021-11-13 02:30:49,801 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/data/d19e9e726/9fa366c5326644b29211a5c92321e5f2 [2021-11-13 02:30:49,804 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-13 02:30:49,805 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-13 02:30:49,807 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-13 02:30:49,807 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-13 02:30:49,810 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-13 02:30:49,811 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 02:30:49" (1/1) ... [2021-11-13 02:30:49,812 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c0b9616 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:30:49, skipping insertion in model container [2021-11-13 02:30:49,812 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 02:30:49" (1/1) ... [2021-11-13 02:30:49,819 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-13 02:30:49,831 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-13 02:30:50,015 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/sv-benchmarks/c/recursive/MultCommutative-2.c[970,983] [2021-11-13 02:30:50,019 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 02:30:50,029 INFO L203 MainTranslator]: Completed pre-run [2021-11-13 02:30:50,056 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/sv-benchmarks/c/recursive/MultCommutative-2.c[970,983] [2021-11-13 02:30:50,057 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 02:30:50,074 INFO L208 MainTranslator]: Completed translation [2021-11-13 02:30:50,074 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:30:50 WrapperNode [2021-11-13 02:30:50,075 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-13 02:30:50,077 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-13 02:30:50,077 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-13 02:30:50,077 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-13 02:30:50,084 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:30:50" (1/1) ... [2021-11-13 02:30:50,091 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:30:50" (1/1) ... [2021-11-13 02:30:50,109 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-13 02:30:50,110 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-13 02:30:50,111 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-13 02:30:50,111 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-13 02:30:50,119 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:30:50" (1/1) ... [2021-11-13 02:30:50,119 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:30:50" (1/1) ... [2021-11-13 02:30:50,128 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:30:50" (1/1) ... [2021-11-13 02:30:50,129 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:30:50" (1/1) ... [2021-11-13 02:30:50,135 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:30:50" (1/1) ... [2021-11-13 02:30:50,136 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:30:50" (1/1) ... [2021-11-13 02:30:50,137 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:30:50" (1/1) ... [2021-11-13 02:30:50,139 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-13 02:30:50,139 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-13 02:30:50,140 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-13 02:30:50,140 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-13 02:30:50,150 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:30:50" (1/1) ... [2021-11-13 02:30:50,156 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 02:30:50,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:30:50,182 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-13 02:30:50,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-13 02:30:50,241 INFO L130 BoogieDeclarations]: Found specification of procedure mult [2021-11-13 02:30:50,242 INFO L138 BoogieDeclarations]: Found implementation of procedure mult [2021-11-13 02:30:50,242 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-13 02:30:50,242 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-13 02:30:50,242 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-13 02:30:50,243 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-13 02:30:50,498 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-13 02:30:50,498 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-13 02:30:50,500 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 02:30:50 BoogieIcfgContainer [2021-11-13 02:30:50,500 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-13 02:30:50,518 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-13 02:30:50,518 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-13 02:30:50,521 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-13 02:30:50,521 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.11 02:30:49" (1/3) ... [2021-11-13 02:30:50,522 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72487540 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 02:30:50, skipping insertion in model container [2021-11-13 02:30:50,522 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 02:30:50" (2/3) ... [2021-11-13 02:30:50,523 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72487540 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 02:30:50, skipping insertion in model container [2021-11-13 02:30:50,523 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 02:30:50" (3/3) ... [2021-11-13 02:30:50,524 INFO L111 eAbstractionObserver]: Analyzing ICFG MultCommutative-2.c [2021-11-13 02:30:50,529 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-13 02:30:50,529 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-13 02:30:50,618 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-13 02:30:50,629 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=FINITE_AUTOMATA, 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 [2021-11-13 02:30:50,629 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-13 02:30:50,662 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-13 02:30:50,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-13 02:30:50,667 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:30:50,668 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:30:50,668 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:30:50,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:30:50,681 INFO L85 PathProgramCache]: Analyzing trace with hash 647179642, now seen corresponding path program 1 times [2021-11-13 02:30:50,690 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:30:50,690 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [875447160] [2021-11-13 02:30:50,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:30:50,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:30:50,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:30:50,953 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-13 02:30:50,953 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:30:50,954 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [875447160] [2021-11-13 02:30:50,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [875447160] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 02:30:50,955 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 02:30:50,955 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-13 02:30:50,956 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613239851] [2021-11-13 02:30:50,957 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 02:30:50,961 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-13 02:30:50,962 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:30:50,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-13 02:30:50,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-13 02:30:51,002 INFO L87 Difference]: Start difference. First operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 02:30:51,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:30:51,123 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2021-11-13 02:30:51,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-13 02:30:51,127 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2021-11-13 02:30:51,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:30:51,135 INFO L225 Difference]: With dead ends: 39 [2021-11-13 02:30:51,136 INFO L226 Difference]: Without dead ends: 27 [2021-11-13 02:30:51,138 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-13 02:30:51,147 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 9 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 53.78ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.12ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 72.00ms IncrementalHoareTripleChecker+Time [2021-11-13 02:30:51,149 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 126 Invalid, 46 Unknown, 0 Unchecked, 5.12ms Time], IncrementalHoareTripleChecker [1 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 72.00ms Time] [2021-11-13 02:30:51,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-13 02:30:51,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2021-11-13 02:30:51,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 5 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-13 02:30:51,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2021-11-13 02:30:51,208 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 19 [2021-11-13 02:30:51,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:30:51,209 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2021-11-13 02:30:51,209 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 02:30:51,209 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2021-11-13 02:30:51,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-13 02:30:51,216 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:30:51,216 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:30:51,216 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-13 02:30:51,217 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:30:51,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:30:51,221 INFO L85 PathProgramCache]: Analyzing trace with hash 1580415186, now seen corresponding path program 1 times [2021-11-13 02:30:51,221 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:30:51,222 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678896717] [2021-11-13 02:30:51,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:30:51,223 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:30:51,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:30:51,384 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-13 02:30:51,385 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:30:51,385 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678896717] [2021-11-13 02:30:51,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1678896717] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 02:30:51,386 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 02:30:51,387 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-13 02:30:51,387 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044946515] [2021-11-13 02:30:51,387 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 02:30:51,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-13 02:30:51,390 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:30:51,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-13 02:30:51,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-13 02:30:51,392 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-13 02:30:51,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:30:51,487 INFO L93 Difference]: Finished difference Result 36 states and 49 transitions. [2021-11-13 02:30:51,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-13 02:30:51,488 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2021-11-13 02:30:51,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:30:51,490 INFO L225 Difference]: With dead ends: 36 [2021-11-13 02:30:51,491 INFO L226 Difference]: Without dead ends: 32 [2021-11-13 02:30:51,491 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-13 02:30:51,494 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 3 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 50.77ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.94ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 66.56ms IncrementalHoareTripleChecker+Time [2021-11-13 02:30:51,497 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 128 Invalid, 39 Unknown, 0 Unchecked, 2.94ms Time], IncrementalHoareTripleChecker [1 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 66.56ms Time] [2021-11-13 02:30:51,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-13 02:30:51,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2021-11-13 02:30:51,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 5 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-13 02:30:51,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2021-11-13 02:30:51,509 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 25 [2021-11-13 02:30:51,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:30:51,509 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2021-11-13 02:30:51,510 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-13 02:30:51,510 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2021-11-13 02:30:51,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-13 02:30:51,511 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:30:51,512 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:30:51,512 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-13 02:30:51,512 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:30:51,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:30:51,513 INFO L85 PathProgramCache]: Analyzing trace with hash -124187766, now seen corresponding path program 1 times [2021-11-13 02:30:51,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:30:51,513 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1199758861] [2021-11-13 02:30:51,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:30:51,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:30:51,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:30:51,597 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-13 02:30:51,598 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:30:51,598 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1199758861] [2021-11-13 02:30:51,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1199758861] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:30:51,599 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [482337232] [2021-11-13 02:30:51,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:30:51,599 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:30:51,599 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:30:51,621 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:30:51,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-13 02:30:51,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:30:51,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-13 02:30:51,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:30:51,901 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-13 02:30:51,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:30:52,067 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-13 02:30:52,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [482337232] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:30:52,069 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2077734878] [2021-11-13 02:30:52,093 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:30:52,093 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:30:52,099 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:30:52,107 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:30:52,108 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 6 [2021-11-13 02:30:52,109 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781023092] [2021-11-13 02:30:52,109 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:30:52,110 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-13 02:30:52,111 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:30:52,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-13 02:30:52,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-13 02:30:52,112 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-13 02:30:52,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:30:52,211 INFO L93 Difference]: Finished difference Result 32 states and 46 transitions. [2021-11-13 02:30:52,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 02:30:52,212 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-11-13 02:30:52,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:30:52,215 INFO L225 Difference]: With dead ends: 32 [2021-11-13 02:30:52,215 INFO L226 Difference]: Without dead ends: 24 [2021-11-13 02:30:52,216 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-13 02:30:52,223 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 8 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 55.42ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.88ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 67.69ms IncrementalHoareTripleChecker+Time [2021-11-13 02:30:52,224 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 43 Invalid, 61 Unknown, 0 Unchecked, 3.88ms Time], IncrementalHoareTripleChecker [5 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 67.69ms Time] [2021-11-13 02:30:52,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-13 02:30:52,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2021-11-13 02:30:52,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-13 02:30:52,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 27 transitions. [2021-11-13 02:30:52,241 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 27 transitions. Word has length 26 [2021-11-13 02:30:52,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:30:52,241 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 27 transitions. [2021-11-13 02:30:52,242 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-13 02:30:52,242 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 27 transitions. [2021-11-13 02:30:52,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-13 02:30:52,243 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:30:52,244 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:30:52,270 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-13 02:30:52,444 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:30:52,445 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:30:52,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:30:52,445 INFO L85 PathProgramCache]: Analyzing trace with hash -590605896, now seen corresponding path program 2 times [2021-11-13 02:30:52,446 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:30:52,446 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088898779] [2021-11-13 02:30:52,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:30:52,446 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:30:52,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:30:52,516 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-13 02:30:52,516 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:30:52,516 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088898779] [2021-11-13 02:30:52,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1088898779] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 02:30:52,517 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 02:30:52,517 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-13 02:30:52,517 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563119552] [2021-11-13 02:30:52,518 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 02:30:52,518 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 02:30:52,518 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:30:52,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 02:30:52,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-13 02:30:52,519 INFO L87 Difference]: Start difference. First operand 21 states and 27 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-13 02:30:52,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:30:52,568 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2021-11-13 02:30:52,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 02:30:52,569 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), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 26 [2021-11-13 02:30:52,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:30:52,577 INFO L225 Difference]: With dead ends: 25 [2021-11-13 02:30:52,578 INFO L226 Difference]: Without dead ends: 21 [2021-11-13 02:30:52,579 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-13 02:30:52,585 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 8 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 30.11ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.19ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 36.60ms IncrementalHoareTripleChecker+Time [2021-11-13 02:30:52,588 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 38 Invalid, 45 Unknown, 0 Unchecked, 1.19ms Time], IncrementalHoareTripleChecker [5 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 36.60ms Time] [2021-11-13 02:30:52,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-13 02:30:52,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-13 02:30:52,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-13 02:30:52,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2021-11-13 02:30:52,598 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 26 [2021-11-13 02:30:52,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:30:52,599 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2021-11-13 02:30:52,599 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), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-13 02:30:52,599 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2021-11-13 02:30:52,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-13 02:30:52,602 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:30:52,602 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:30:52,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-13 02:30:52,603 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:30:52,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:30:52,603 INFO L85 PathProgramCache]: Analyzing trace with hash 132154764, now seen corresponding path program 3 times [2021-11-13 02:30:52,604 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:30:52,604 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926333295] [2021-11-13 02:30:52,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:30:52,606 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:30:52,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:30:53,087 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 02:30:53,088 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:30:53,088 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1926333295] [2021-11-13 02:30:53,088 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1926333295] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:30:53,088 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1803894385] [2021-11-13 02:30:53,088 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:30:53,089 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:30:53,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:30:53,090 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:30:53,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-13 02:30:53,149 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:30:53,150 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:30:53,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-13 02:30:53,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:30:53,616 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-13 02:30:53,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:30:54,847 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-13 02:30:54,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1803894385] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:30:54,848 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2134032671] [2021-11-13 02:30:54,851 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:30:54,851 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:30:54,852 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:30:54,853 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:30:54,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 11, 14] total 35 [2021-11-13 02:30:54,853 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288046060] [2021-11-13 02:30:54,853 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:30:54,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-13 02:30:54,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:30:54,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-13 02:30:54,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1061, Unknown=0, NotChecked=0, Total=1190 [2021-11-13 02:30:54,856 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 35 states, 32 states have (on average 1.53125) internal successors, (49), 24 states have internal predecessors, (49), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) [2021-11-13 02:30:55,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:30:55,633 INFO L93 Difference]: Finished difference Result 39 states and 49 transitions. [2021-11-13 02:30:55,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-13 02:30:55,634 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 32 states have (on average 1.53125) internal successors, (49), 24 states have internal predecessors, (49), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) Word has length 33 [2021-11-13 02:30:55,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:30:55,635 INFO L225 Difference]: With dead ends: 39 [2021-11-13 02:30:55,635 INFO L226 Difference]: Without dead ends: 35 [2021-11-13 02:30:55,637 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=293, Invalid=1777, Unknown=0, NotChecked=0, Total=2070 [2021-11-13 02:30:55,638 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 70 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 372 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 247.93ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.02ms SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 372 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 302.46ms IncrementalHoareTripleChecker+Time [2021-11-13 02:30:55,638 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 159 Invalid, 453 Unknown, 0 Unchecked, 5.02ms Time], IncrementalHoareTripleChecker [81 Valid, 372 Invalid, 0 Unknown, 0 Unchecked, 302.46ms Time] [2021-11-13 02:30:55,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-13 02:30:55,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2021-11-13 02:30:55,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 20 states have internal predecessors, (20), 5 states have call successors, (5), 1 states have call predecessors, (5), 4 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) [2021-11-13 02:30:55,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2021-11-13 02:30:55,648 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 33 [2021-11-13 02:30:55,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:30:55,648 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2021-11-13 02:30:55,649 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 32 states have (on average 1.53125) internal successors, (49), 24 states have internal predecessors, (49), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) [2021-11-13 02:30:55,649 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2021-11-13 02:30:55,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-13 02:30:55,651 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:30:55,651 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:30:55,688 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-13 02:30:55,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:30:55,865 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:30:55,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:30:55,866 INFO L85 PathProgramCache]: Analyzing trace with hash 169705396, now seen corresponding path program 1 times [2021-11-13 02:30:55,866 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:30:55,866 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690895890] [2021-11-13 02:30:55,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:30:55,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:30:55,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:30:55,930 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-13 02:30:55,930 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:30:55,930 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [690895890] [2021-11-13 02:30:55,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [690895890] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:30:55,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1440291834] [2021-11-13 02:30:55,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:30:55,931 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:30:55,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:30:55,950 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:30:55,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-13 02:30:56,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:30:56,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-13 02:30:56,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:30:56,119 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-13 02:30:56,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:30:56,314 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-13 02:30:56,315 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1440291834] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:30:56,315 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [97761290] [2021-11-13 02:30:56,321 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-13 02:30:56,322 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:30:56,324 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:30:56,325 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:30:56,325 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 10 [2021-11-13 02:30:56,326 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710831850] [2021-11-13 02:30:56,326 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:30:56,328 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-13 02:30:56,328 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:30:56,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-13 02:30:56,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-13 02:30:56,329 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-13 02:30:56,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:30:56,444 INFO L93 Difference]: Finished difference Result 56 states and 82 transitions. [2021-11-13 02:30:56,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-13 02:30:56,445 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 39 [2021-11-13 02:30:56,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:30:56,448 INFO L225 Difference]: With dead ends: 56 [2021-11-13 02:30:56,448 INFO L226 Difference]: Without dead ends: 24 [2021-11-13 02:30:56,453 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=81, Invalid=159, Unknown=0, NotChecked=0, Total=240 [2021-11-13 02:30:56,454 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 19 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 43.44ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.33ms SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 56.16ms IncrementalHoareTripleChecker+Time [2021-11-13 02:30:56,455 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 72 Invalid, 93 Unknown, 0 Unchecked, 1.33ms Time], IncrementalHoareTripleChecker [15 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 56.16ms Time] [2021-11-13 02:30:56,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-13 02:30:56,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-13 02:30:56,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.0625) internal successors, (17), 17 states have internal predecessors, (17), 4 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-13 02:30:56,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2021-11-13 02:30:56,468 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 39 [2021-11-13 02:30:56,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:30:56,469 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2021-11-13 02:30:56,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-13 02:30:56,469 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2021-11-13 02:30:56,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-13 02:30:56,478 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:30:56,478 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:30:56,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-13 02:30:56,692 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:30:56,692 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:30:56,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:30:56,693 INFO L85 PathProgramCache]: Analyzing trace with hash 735115528, now seen corresponding path program 4 times [2021-11-13 02:30:56,693 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:30:56,693 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972485915] [2021-11-13 02:30:56,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:30:56,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:30:56,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:30:57,065 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 4 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-13 02:30:57,065 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:30:57,065 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972485915] [2021-11-13 02:30:57,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1972485915] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:30:57,066 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [868806535] [2021-11-13 02:30:57,066 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:30:57,066 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:30:57,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:30:57,073 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:30:57,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-13 02:30:57,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:30:57,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-13 02:30:57,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:30:57,944 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 7 proven. 31 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-13 02:30:57,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:30:59,707 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 9 proven. 37 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-13 02:30:59,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [868806535] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:30:59,708 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1083743647] [2021-11-13 02:30:59,711 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:30:59,711 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:30:59,711 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:30:59,713 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:30:59,713 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 22] total 48 [2021-11-13 02:30:59,713 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871560886] [2021-11-13 02:30:59,713 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:30:59,714 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-13 02:30:59,714 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:30:59,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-13 02:30:59,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=2063, Unknown=0, NotChecked=0, Total=2256 [2021-11-13 02:30:59,717 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 48 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 34 states have internal predecessors, (66), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (15), 14 states have call predecessors, (15), 12 states have call successors, (15) [2021-11-13 02:31:00,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:00,839 INFO L93 Difference]: Finished difference Result 48 states and 58 transitions. [2021-11-13 02:31:00,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-13 02:31:00,840 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 34 states have internal predecessors, (66), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (15), 14 states have call predecessors, (15), 12 states have call successors, (15) Word has length 40 [2021-11-13 02:31:00,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:00,841 INFO L225 Difference]: With dead ends: 48 [2021-11-13 02:31:00,841 INFO L226 Difference]: Without dead ends: 40 [2021-11-13 02:31:00,844 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 48 SyntacticMatches, 4 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 926 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=526, Invalid=3764, Unknown=0, NotChecked=0, Total=4290 [2021-11-13 02:31:00,845 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 42 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 778 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 405.51ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 840 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.82ms SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 778 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 507.19ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:00,845 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 212 Invalid, 840 Unknown, 0 Unchecked, 6.82ms Time], IncrementalHoareTripleChecker [62 Valid, 778 Invalid, 0 Unknown, 0 Unchecked, 507.19ms Time] [2021-11-13 02:31:00,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-13 02:31:00,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 31. [2021-11-13 02:31:00,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 22 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) [2021-11-13 02:31:00,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 40 transitions. [2021-11-13 02:31:00,864 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 40 transitions. Word has length 40 [2021-11-13 02:31:00,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:00,865 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 40 transitions. [2021-11-13 02:31:00,865 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 34 states have internal predecessors, (66), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (15), 14 states have call predecessors, (15), 12 states have call successors, (15) [2021-11-13 02:31:00,866 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 40 transitions. [2021-11-13 02:31:00,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-13 02:31:00,870 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:00,870 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:31:00,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:01,085 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:01,085 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:01,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:01,085 INFO L85 PathProgramCache]: Analyzing trace with hash -1490504886, now seen corresponding path program 5 times [2021-11-13 02:31:01,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:01,086 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1078559729] [2021-11-13 02:31:01,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:01,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:01,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:01,836 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-13 02:31:01,836 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:01,836 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1078559729] [2021-11-13 02:31:01,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1078559729] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:01,836 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170606712] [2021-11-13 02:31:01,837 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:31:01,837 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:01,837 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:01,838 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:01,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-13 02:31:01,905 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-13 02:31:01,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:01,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-13 02:31:01,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:02,820 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 3 proven. 61 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-13 02:31:02,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:08,503 WARN L838 $PredicateComparison]: unable to prove that (and (<= 0 |c_mult_#in~m|) (forall ((v_mult_~n_BEFORE_CALL_20 Int) (|aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| Int) (|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| Int) (|aux_div_v_mult_#in~n_BEFORE_CALL_20_90| Int) (|aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121| Int)) (let ((.cse3 (* 3 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145|))) (let ((.cse1 (* 3 |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121|)) (.cse0 (+ |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| |c_mult_#res| .cse3)) (.cse2 (div (+ (- 1) (* v_mult_~n_BEFORE_CALL_20 2) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| (- 6)) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| (- 2))) (- 3))) (.cse4 (div (+ (- 1) (* v_mult_~n_BEFORE_CALL_20 (- 2)) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| 6) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| 2)) 3))) (or (< .cse0 .cse1) (< (+ |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| 1) .cse2) (<= .cse2 (+ |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121| 1)) (< (* 3 |aux_div_v_mult_#in~n_BEFORE_CALL_20_90|) (+ |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| .cse3)) (< (+ .cse4 1) |aux_div_v_mult_#in~n_BEFORE_CALL_20_90|) (<= (+ .cse1 3) .cse0) (< |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| 0) (< .cse2 (+ 2 .cse4)))))) (forall ((v_mult_~n_BEFORE_CALL_20 Int) (|aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| Int) (|aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109| Int) (|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| Int) (|aux_div_v_mult_#in~n_BEFORE_CALL_20_90| Int)) (let ((.cse6 (div (+ (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| 6) (- 1) (* v_mult_~n_BEFORE_CALL_20 (- 2)) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| (- 2)) (* |c_mult_#res| (- 2))) 3))) (let ((.cse5 (div (+ (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| (- 6)) (- 1) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| 2) (* v_mult_~n_BEFORE_CALL_20 2) (* |c_mult_#res| 2)) (- 3))) (.cse8 (* 3 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163|)) (.cse7 (+ .cse6 1))) (or (< .cse5 (+ 2 .cse6)) (<= 3 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163|) (<= |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| .cse7) (< (+ |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| |c_mult_#res| (* 3 |aux_div_v_mult_#in~n_BEFORE_CALL_20_90|)) .cse8) (< |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| 0) (< (+ |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109| 1) .cse5) (< .cse8 (+ |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| |c_mult_#res| (* 3 |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109|))) (< .cse7 |aux_div_v_mult_#in~n_BEFORE_CALL_20_90|))))) (<= |c_mult_#in~m| 0)) is different from false [2021-11-13 02:31:09,256 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 20 proven. 70 refuted. 0 times theorem prover too weak. 23 trivial. 12 not checked. [2021-11-13 02:31:09,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1170606712] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:09,257 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [391722963] [2021-11-13 02:31:09,259 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:31:09,259 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:09,260 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:31:09,261 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:09,261 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 16, 25] total 58 [2021-11-13 02:31:09,261 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47751382] [2021-11-13 02:31:09,261 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:09,262 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-13 02:31:09,262 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:09,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-13 02:31:09,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=2998, Unknown=1, NotChecked=110, Total=3306 [2021-11-13 02:31:09,264 INFO L87 Difference]: Start difference. First operand 31 states and 40 transitions. Second operand has 58 states, 53 states have (on average 1.509433962264151) internal successors, (80), 40 states have internal predecessors, (80), 15 states have call successors, (15), 1 states have call predecessors, (15), 13 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19) [2021-11-13 02:31:11,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:11,442 INFO L93 Difference]: Finished difference Result 60 states and 79 transitions. [2021-11-13 02:31:11,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-13 02:31:11,442 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 53 states have (on average 1.509433962264151) internal successors, (80), 40 states have internal predecessors, (80), 15 states have call successors, (15), 1 states have call predecessors, (15), 13 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19) Word has length 54 [2021-11-13 02:31:11,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:11,443 INFO L225 Difference]: With dead ends: 60 [2021-11-13 02:31:11,443 INFO L226 Difference]: Without dead ends: 49 [2021-11-13 02:31:11,446 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 76 SyntacticMatches, 3 SemanticMatches, 81 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1347 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=736, Invalid=5909, Unknown=1, NotChecked=160, Total=6806 [2021-11-13 02:31:11,447 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 60 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 1119 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 677.60ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 1265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.99ms SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 1119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 42 IncrementalHoareTripleChecker+Unchecked, 797.11ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:11,447 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 262 Invalid, 1265 Unknown, 0 Unchecked, 6.99ms Time], IncrementalHoareTripleChecker [104 Valid, 1119 Invalid, 0 Unknown, 42 Unchecked, 797.11ms Time] [2021-11-13 02:31:11,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-13 02:31:11,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 34. [2021-11-13 02:31:11,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 24 states have internal predecessors, (25), 5 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (14), 7 states have call predecessors, (14), 5 states have call successors, (14) [2021-11-13 02:31:11,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2021-11-13 02:31:11,455 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 54 [2021-11-13 02:31:11,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:11,456 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2021-11-13 02:31:11,456 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 53 states have (on average 1.509433962264151) internal successors, (80), 40 states have internal predecessors, (80), 15 states have call successors, (15), 1 states have call predecessors, (15), 13 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19) [2021-11-13 02:31:11,456 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2021-11-13 02:31:11,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-13 02:31:11,457 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:11,457 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:31:11,496 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:11,685 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-13 02:31:11,685 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:11,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:11,685 INFO L85 PathProgramCache]: Analyzing trace with hash -140737028, now seen corresponding path program 6 times [2021-11-13 02:31:11,686 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:11,686 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31654071] [2021-11-13 02:31:11,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:11,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:11,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:12,137 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 2 proven. 66 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-13 02:31:12,137 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:12,137 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31654071] [2021-11-13 02:31:12,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31654071] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:12,138 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [549847571] [2021-11-13 02:31:12,138 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:31:12,138 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:12,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:12,139 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:12,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-13 02:31:12,197 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:31:12,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:12,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-13 02:31:12,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:12,973 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-13 02:31:12,973 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:14,609 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 02:31:14,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [549847571] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:14,609 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [20118691] [2021-11-13 02:31:14,612 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:31:14,612 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:14,613 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:31:14,614 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:14,614 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 23] total 56 [2021-11-13 02:31:14,615 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51694958] [2021-11-13 02:31:14,615 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:14,616 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-13 02:31:14,616 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:14,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-13 02:31:14,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-11-13 02:31:14,619 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 56 states, 52 states have (on average 1.5192307692307692) internal successors, (79), 38 states have internal predecessors, (79), 14 states have call successors, (14), 1 states have call predecessors, (14), 12 states have return successors, (18), 18 states have call predecessors, (18), 14 states have call successors, (18) [2021-11-13 02:31:16,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:16,003 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2021-11-13 02:31:16,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-13 02:31:16,004 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 52 states have (on average 1.5192307692307692) internal successors, (79), 38 states have internal predecessors, (79), 14 states have call successors, (14), 1 states have call predecessors, (14), 12 states have return successors, (18), 18 states have call predecessors, (18), 14 states have call successors, (18) Word has length 47 [2021-11-13 02:31:16,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:16,005 INFO L225 Difference]: With dead ends: 54 [2021-11-13 02:31:16,005 INFO L226 Difference]: Without dead ends: 45 [2021-11-13 02:31:16,008 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1330 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=705, Invalid=5301, Unknown=0, NotChecked=0, Total=6006 [2021-11-13 02:31:16,008 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 63 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 855 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 456.09ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 962 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.89ms SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 855 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 537.20ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:16,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 203 Invalid, 962 Unknown, 0 Unchecked, 6.89ms Time], IncrementalHoareTripleChecker [107 Valid, 855 Invalid, 0 Unknown, 0 Unchecked, 537.20ms Time] [2021-11-13 02:31:16,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-13 02:31:16,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 34. [2021-11-13 02:31:16,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 24 states have internal predecessors, (25), 5 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (13), 7 states have call predecessors, (13), 5 states have call successors, (13) [2021-11-13 02:31:16,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 43 transitions. [2021-11-13 02:31:16,016 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 43 transitions. Word has length 47 [2021-11-13 02:31:16,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:16,016 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 43 transitions. [2021-11-13 02:31:16,017 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 52 states have (on average 1.5192307692307692) internal successors, (79), 38 states have internal predecessors, (79), 14 states have call successors, (14), 1 states have call predecessors, (14), 12 states have return successors, (18), 18 states have call predecessors, (18), 14 states have call successors, (18) [2021-11-13 02:31:16,017 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 43 transitions. [2021-11-13 02:31:16,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-13 02:31:16,018 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:16,018 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 6, 6, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:31:16,049 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:16,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:16,241 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:16,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:16,242 INFO L85 PathProgramCache]: Analyzing trace with hash -87767316, now seen corresponding path program 7 times [2021-11-13 02:31:16,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:16,242 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1521828390] [2021-11-13 02:31:16,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:16,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:16,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:16,952 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 4 proven. 138 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-13 02:31:16,952 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:16,952 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1521828390] [2021-11-13 02:31:16,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1521828390] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:16,953 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2093475135] [2021-11-13 02:31:16,953 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:31:16,953 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:16,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:16,953 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:16,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-13 02:31:17,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:17,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-13 02:31:17,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:18,142 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 32 proven. 80 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-13 02:31:18,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:22,423 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 8 proven. 134 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-13 02:31:22,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2093475135] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:22,424 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [134746782] [2021-11-13 02:31:22,438 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:31:22,438 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:22,438 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:31:22,439 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:22,439 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 25, 29] total 73 [2021-11-13 02:31:22,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108190419] [2021-11-13 02:31:22,439 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:22,440 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-13 02:31:22,441 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:22,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-13 02:31:22,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=5006, Unknown=0, NotChecked=0, Total=5256 [2021-11-13 02:31:22,444 INFO L87 Difference]: Start difference. First operand 34 states and 43 transitions. Second operand has 73 states, 70 states have (on average 1.5285714285714285) internal successors, (107), 49 states have internal predecessors, (107), 18 states have call successors, (18), 1 states have call predecessors, (18), 20 states have return successors, (24), 24 states have call predecessors, (24), 18 states have call successors, (24) [2021-11-13 02:31:26,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:26,061 INFO L93 Difference]: Finished difference Result 89 states and 119 transitions. [2021-11-13 02:31:26,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-13 02:31:26,063 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 70 states have (on average 1.5285714285714285) internal successors, (107), 49 states have internal predecessors, (107), 18 states have call successors, (18), 1 states have call predecessors, (18), 20 states have return successors, (24), 24 states have call predecessors, (24), 18 states have call successors, (24) Word has length 61 [2021-11-13 02:31:26,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:26,066 INFO L225 Difference]: With dead ends: 89 [2021-11-13 02:31:26,066 INFO L226 Difference]: Without dead ends: 81 [2021-11-13 02:31:26,071 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2200 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=1026, Invalid=9894, Unknown=0, NotChecked=0, Total=10920 [2021-11-13 02:31:26,072 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 83 mSDsluCounter, 573 mSDsCounter, 0 mSdLazyCounter, 2147 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1352.90ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 550 SdHoareTripleChecker+Invalid, 2326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 14.85ms SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 2147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1609.02ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:26,073 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 550 Invalid, 2326 Unknown, 0 Unchecked, 14.85ms Time], IncrementalHoareTripleChecker [179 Valid, 2147 Invalid, 0 Unknown, 0 Unchecked, 1609.02ms Time] [2021-11-13 02:31:26,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-13 02:31:26,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 67. [2021-11-13 02:31:26,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 46 states have internal predecessors, (49), 9 states have call successors, (9), 4 states have call predecessors, (9), 12 states have return successors, (36), 16 states have call predecessors, (36), 9 states have call successors, (36) [2021-11-13 02:31:26,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 94 transitions. [2021-11-13 02:31:26,115 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 94 transitions. Word has length 61 [2021-11-13 02:31:26,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:26,116 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 94 transitions. [2021-11-13 02:31:26,116 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 70 states have (on average 1.5285714285714285) internal successors, (107), 49 states have internal predecessors, (107), 18 states have call successors, (18), 1 states have call predecessors, (18), 20 states have return successors, (24), 24 states have call predecessors, (24), 18 states have call successors, (24) [2021-11-13 02:31:26,116 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 94 transitions. [2021-11-13 02:31:26,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-13 02:31:26,119 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:26,119 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 10, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:31:26,164 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:26,333 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-13 02:31:26,333 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:26,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:26,334 INFO L85 PathProgramCache]: Analyzing trace with hash -943012406, now seen corresponding path program 8 times [2021-11-13 02:31:26,334 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:26,334 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738446917] [2021-11-13 02:31:26,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:26,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:26,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:27,542 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 347 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-13 02:31:27,542 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:27,542 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738446917] [2021-11-13 02:31:27,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1738446917] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:27,542 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1880783830] [2021-11-13 02:31:27,543 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:31:27,543 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:27,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:27,545 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:27,546 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-13 02:31:27,627 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-13 02:31:27,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:27,630 WARN L261 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 145 conjunts are in the unsatisfiable core [2021-11-13 02:31:27,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:29,141 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 6 proven. 197 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2021-11-13 02:31:29,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:49,762 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_58_60_158|, |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_58_60_158_166|, |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_58_60_158_166|] [2021-11-13 02:31:49,762 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1028350293] [2021-11-13 02:31:49,765 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:31:49,765 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:49,765 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:31:49,767 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 02:31:49,767 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2021-11-13 02:31:49,767 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988292599] [2021-11-13 02:31:49,767 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:49,769 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-13 02:31:49,769 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:49,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-13 02:31:49,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=7003, Unknown=7, NotChecked=0, Total=7310 [2021-11-13 02:31:49,773 INFO L87 Difference]: Start difference. First operand 67 states and 94 transitions. Second operand has 41 states, 38 states have (on average 1.5263157894736843) internal successors, (58), 29 states have internal predecessors, (58), 11 states have call successors, (11), 1 states have call predecessors, (11), 11 states have return successors, (12), 12 states have call predecessors, (12), 11 states have call successors, (12) [2021-11-13 02:31:52,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:52,316 INFO L93 Difference]: Finished difference Result 80 states and 113 transitions. [2021-11-13 02:31:52,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-13 02:31:52,319 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 38 states have (on average 1.5263157894736843) internal successors, (58), 29 states have internal predecessors, (58), 11 states have call successors, (11), 1 states have call predecessors, (11), 11 states have return successors, (12), 12 states have call predecessors, (12), 11 states have call successors, (12) Word has length 89 [2021-11-13 02:31:52,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:52,321 INFO L225 Difference]: With dead ends: 80 [2021-11-13 02:31:52,321 INFO L226 Difference]: Without dead ends: 76 [2021-11-13 02:31:52,326 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 110 SyntacticMatches, 4 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2138 ImplicationChecksByTransitivity, 18.9s TimeCoverageRelationStatistics Valid=829, Invalid=9670, Unknown=7, NotChecked=0, Total=10506 [2021-11-13 02:31:52,327 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 122 mSDsluCounter, 484 mSDsCounter, 0 mSdLazyCounter, 1192 mSolverCounterSat, 154 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 738.94ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 472 SdHoareTripleChecker+Invalid, 1346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.14ms SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 1192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 893.39ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:52,327 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 472 Invalid, 1346 Unknown, 0 Unchecked, 8.14ms Time], IncrementalHoareTripleChecker [154 Valid, 1192 Invalid, 0 Unknown, 0 Unchecked, 893.39ms Time] [2021-11-13 02:31:52,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-13 02:31:52,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 72. [2021-11-13 02:31:52,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 48 states have (on average 1.0833333333333333) internal successors, (52), 49 states have internal predecessors, (52), 10 states have call successors, (10), 4 states have call predecessors, (10), 13 states have return successors, (44), 18 states have call predecessors, (44), 10 states have call successors, (44) [2021-11-13 02:31:52,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 106 transitions. [2021-11-13 02:31:52,350 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 106 transitions. Word has length 89 [2021-11-13 02:31:52,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:52,352 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 106 transitions. [2021-11-13 02:31:52,352 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 38 states have (on average 1.5263157894736843) internal successors, (58), 29 states have internal predecessors, (58), 11 states have call successors, (11), 1 states have call predecessors, (11), 11 states have return successors, (12), 12 states have call predecessors, (12), 11 states have call successors, (12) [2021-11-13 02:31:52,352 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 106 transitions. [2021-11-13 02:31:52,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-13 02:31:52,355 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:52,356 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 8, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:31:52,391 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:52,577 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:52,577 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:52,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:52,578 INFO L85 PathProgramCache]: Analyzing trace with hash 1637495290, now seen corresponding path program 9 times [2021-11-13 02:31:52,578 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:52,578 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833947656] [2021-11-13 02:31:52,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:52,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:52,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:53,147 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 0 proven. 208 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-13 02:31:53,147 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:53,148 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833947656] [2021-11-13 02:31:53,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1833947656] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:53,148 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1867638061] [2021-11-13 02:31:53,148 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:31:53,148 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:53,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:53,149 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:53,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-13 02:31:53,227 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:31:53,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:31:53,229 WARN L261 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 121 conjunts are in the unsatisfiable core [2021-11-13 02:31:53,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:31:54,258 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 4 proven. 132 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-13 02:31:54,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:31:57,101 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 17 proven. 197 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-13 02:31:57,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1867638061] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:31:57,101 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1715845593] [2021-11-13 02:31:57,103 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:31:57,103 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:31:57,104 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:31:57,105 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:31:57,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 18, 24] total 53 [2021-11-13 02:31:57,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721149116] [2021-11-13 02:31:57,105 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:31:57,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-13 02:31:57,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:31:57,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-13 02:31:57,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=2575, Unknown=0, NotChecked=0, Total=2756 [2021-11-13 02:31:57,108 INFO L87 Difference]: Start difference. First operand 72 states and 106 transitions. Second operand has 53 states, 49 states have (on average 1.510204081632653) internal successors, (74), 35 states have internal predecessors, (74), 14 states have call successors, (14), 1 states have call predecessors, (14), 11 states have return successors, (19), 18 states have call predecessors, (19), 14 states have call successors, (19) [2021-11-13 02:31:58,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:31:58,343 INFO L93 Difference]: Finished difference Result 80 states and 113 transitions. [2021-11-13 02:31:58,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-13 02:31:58,343 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 49 states have (on average 1.510204081632653) internal successors, (74), 35 states have internal predecessors, (74), 14 states have call successors, (14), 1 states have call predecessors, (14), 11 states have return successors, (19), 18 states have call predecessors, (19), 14 states have call successors, (19) Word has length 75 [2021-11-13 02:31:58,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:31:58,345 INFO L225 Difference]: With dead ends: 80 [2021-11-13 02:31:58,345 INFO L226 Difference]: Without dead ends: 70 [2021-11-13 02:31:58,346 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 131 SyntacticMatches, 4 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1157 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=531, Invalid=4581, Unknown=0, NotChecked=0, Total=5112 [2021-11-13 02:31:58,353 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 96 mSDsluCounter, 311 mSDsCounter, 0 mSdLazyCounter, 894 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 474.81ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 1042 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.63ms SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 894 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 555.04ms IncrementalHoareTripleChecker+Time [2021-11-13 02:31:58,353 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [99 Valid, 294 Invalid, 1042 Unknown, 0 Unchecked, 4.63ms Time], IncrementalHoareTripleChecker [148 Valid, 894 Invalid, 0 Unknown, 0 Unchecked, 555.04ms Time] [2021-11-13 02:31:58,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-13 02:31:58,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-11-13 02:31:58,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 48 states have internal predecessors, (51), 9 states have call successors, (9), 4 states have call predecessors, (9), 13 states have return successors, (37), 17 states have call predecessors, (37), 9 states have call successors, (37) [2021-11-13 02:31:58,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 97 transitions. [2021-11-13 02:31:58,366 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 97 transitions. Word has length 75 [2021-11-13 02:31:58,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:31:58,366 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 97 transitions. [2021-11-13 02:31:58,367 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 49 states have (on average 1.510204081632653) internal successors, (74), 35 states have internal predecessors, (74), 14 states have call successors, (14), 1 states have call predecessors, (14), 11 states have return successors, (19), 18 states have call predecessors, (19), 14 states have call successors, (19) [2021-11-13 02:31:58,367 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 97 transitions. [2021-11-13 02:31:58,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-13 02:31:58,368 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:31:58,369 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 8, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:31:58,399 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-13 02:31:58,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-13 02:31:58,585 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:31:58,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:31:58,586 INFO L85 PathProgramCache]: Analyzing trace with hash -335813798, now seen corresponding path program 10 times [2021-11-13 02:31:58,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:31:58,586 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [268169905] [2021-11-13 02:31:58,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:31:58,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:31:58,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:59,475 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 0 proven. 232 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-13 02:31:59,475 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:31:59,476 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [268169905] [2021-11-13 02:31:59,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [268169905] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:31:59,476 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1694805049] [2021-11-13 02:31:59,476 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:31:59,476 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:31:59,476 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:31:59,477 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:31:59,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-13 02:31:59,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:31:59,557 WARN L261 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 121 conjunts are in the unsatisfiable core [2021-11-13 02:31:59,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:32:01,004 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 6 proven. 136 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2021-11-13 02:32:01,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:33:37,527 WARN L227 SmtUtils]: Spent 8.28s on a formula simplification that was a NOOP. DAG size: 76 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-13 02:33:38,028 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 31 proven. 203 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-13 02:33:38,029 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1694805049] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:33:38,029 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1367816884] [2021-11-13 02:33:38,031 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:33:38,031 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:33:38,031 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:33:38,032 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:33:38,032 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 22, 34] total 79 [2021-11-13 02:33:38,033 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507188927] [2021-11-13 02:33:38,033 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:33:38,034 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-13 02:33:38,034 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:33:38,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-13 02:33:38,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=272, Invalid=5854, Unknown=36, NotChecked=0, Total=6162 [2021-11-13 02:33:38,036 INFO L87 Difference]: Start difference. First operand 70 states and 97 transitions. Second operand has 79 states, 74 states have (on average 1.527027027027027) internal successors, (113), 52 states have internal predecessors, (113), 21 states have call successors, (21), 1 states have call predecessors, (21), 19 states have return successors, (28), 27 states have call predecessors, (28), 21 states have call successors, (28) [2021-11-13 02:33:42,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:33:42,771 INFO L93 Difference]: Finished difference Result 92 states and 122 transitions. [2021-11-13 02:33:42,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-13 02:33:42,771 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 74 states have (on average 1.527027027027027) internal successors, (113), 52 states have internal predecessors, (113), 21 states have call successors, (21), 1 states have call predecessors, (21), 19 states have return successors, (28), 27 states have call predecessors, (28), 21 states have call successors, (28) Word has length 75 [2021-11-13 02:33:42,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:33:42,773 INFO L225 Difference]: With dead ends: 92 [2021-11-13 02:33:42,773 INFO L226 Difference]: Without dead ends: 85 [2021-11-13 02:33:42,775 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 106 SyntacticMatches, 3 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2265 ImplicationChecksByTransitivity, 98.3s TimeCoverageRelationStatistics Valid=1022, Invalid=10071, Unknown=37, NotChecked=0, Total=11130 [2021-11-13 02:33:42,776 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 146 mSDsluCounter, 630 mSDsCounter, 0 mSdLazyCounter, 1819 mSolverCounterSat, 242 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1061.59ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 612 SdHoareTripleChecker+Invalid, 2100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.68ms SdHoareTripleChecker+Time, 242 IncrementalHoareTripleChecker+Valid, 1819 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 39 IncrementalHoareTripleChecker+Unchecked, 1235.28ms IncrementalHoareTripleChecker+Time [2021-11-13 02:33:42,776 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 612 Invalid, 2100 Unknown, 0 Unchecked, 9.68ms Time], IncrementalHoareTripleChecker [242 Valid, 1819 Invalid, 0 Unknown, 39 Unchecked, 1235.28ms Time] [2021-11-13 02:33:42,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-13 02:33:42,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 70. [2021-11-13 02:33:42,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 48 states have internal predecessors, (51), 9 states have call successors, (9), 4 states have call predecessors, (9), 13 states have return successors, (31), 17 states have call predecessors, (31), 9 states have call successors, (31) [2021-11-13 02:33:42,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 91 transitions. [2021-11-13 02:33:42,787 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 91 transitions. Word has length 75 [2021-11-13 02:33:42,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:33:42,788 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 91 transitions. [2021-11-13 02:33:42,788 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 74 states have (on average 1.527027027027027) internal successors, (113), 52 states have internal predecessors, (113), 21 states have call successors, (21), 1 states have call predecessors, (21), 19 states have return successors, (28), 27 states have call predecessors, (28), 21 states have call successors, (28) [2021-11-13 02:33:42,789 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 91 transitions. [2021-11-13 02:33:42,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-13 02:33:42,790 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:33:42,790 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 9, 9, 9, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:33:42,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-13 02:33:43,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:33:43,005 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:33:43,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:33:43,005 INFO L85 PathProgramCache]: Analyzing trace with hash -1392852054, now seen corresponding path program 11 times [2021-11-13 02:33:43,006 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:33:43,006 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164121915] [2021-11-13 02:33:43,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:33:43,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:33:43,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:33:44,249 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2021-11-13 02:33:44,249 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:33:44,249 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164121915] [2021-11-13 02:33:44,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [164121915] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:33:44,250 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1564625839] [2021-11-13 02:33:44,250 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:33:44,250 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:33:44,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:33:44,251 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:33:44,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-13 02:33:44,356 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-13 02:33:44,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:33:44,360 WARN L261 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 132 conjunts are in the unsatisfiable core [2021-11-13 02:33:44,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:33:46,626 INFO L883 QuantifierPusher]: Run 10 iterations of DualJunctionQuantifierElimination maybe there is a nontermination bug. [2021-11-13 02:33:46,655 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 20 proven. 174 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-13 02:33:46,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:33:52,880 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 33 proven. 259 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-13 02:33:52,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1564625839] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:33:52,880 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [853594691] [2021-11-13 02:33:52,882 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:33:52,883 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:33:52,883 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:33:52,884 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:33:52,884 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 28, 40] total 90 [2021-11-13 02:33:52,884 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793453476] [2021-11-13 02:33:52,884 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:33:52,885 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 90 states [2021-11-13 02:33:52,885 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:33:52,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2021-11-13 02:33:52,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=375, Invalid=7635, Unknown=0, NotChecked=0, Total=8010 [2021-11-13 02:33:52,888 INFO L87 Difference]: Start difference. First operand 70 states and 91 transitions. Second operand has 90 states, 83 states have (on average 1.5301204819277108) internal successors, (127), 60 states have internal predecessors, (127), 24 states have call successors, (24), 1 states have call predecessors, (24), 20 states have return successors, (32), 30 states have call predecessors, (32), 24 states have call successors, (32) [2021-11-13 02:33:56,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:33:56,121 INFO L93 Difference]: Finished difference Result 95 states and 127 transitions. [2021-11-13 02:33:56,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-13 02:33:56,121 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 83 states have (on average 1.5301204819277108) internal successors, (127), 60 states have internal predecessors, (127), 24 states have call successors, (24), 1 states have call predecessors, (24), 20 states have return successors, (32), 30 states have call predecessors, (32), 24 states have call successors, (32) Word has length 82 [2021-11-13 02:33:56,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:33:56,123 INFO L225 Difference]: With dead ends: 95 [2021-11-13 02:33:56,123 INFO L226 Difference]: Without dead ends: 88 [2021-11-13 02:33:56,124 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 104 SyntacticMatches, 11 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3148 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=1241, Invalid=12331, Unknown=0, NotChecked=0, Total=13572 [2021-11-13 02:33:56,125 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 119 mSDsluCounter, 691 mSDsCounter, 0 mSdLazyCounter, 2329 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1513.93ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 660 SdHoareTripleChecker+Invalid, 2500 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 14.48ms SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 2329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1773.40ms IncrementalHoareTripleChecker+Time [2021-11-13 02:33:56,126 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [131 Valid, 660 Invalid, 2500 Unknown, 0 Unchecked, 14.48ms Time], IncrementalHoareTripleChecker [171 Valid, 2329 Invalid, 0 Unknown, 0 Unchecked, 1773.40ms Time] [2021-11-13 02:33:56,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-13 02:33:56,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 73. [2021-11-13 02:33:56,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 49 states have (on average 1.0816326530612246) internal successors, (53), 50 states have internal predecessors, (53), 9 states have call successors, (9), 4 states have call predecessors, (9), 14 states have return successors, (34), 18 states have call predecessors, (34), 9 states have call successors, (34) [2021-11-13 02:33:56,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 96 transitions. [2021-11-13 02:33:56,139 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 96 transitions. Word has length 82 [2021-11-13 02:33:56,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:33:56,140 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 96 transitions. [2021-11-13 02:33:56,141 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 90 states, 83 states have (on average 1.5301204819277108) internal successors, (127), 60 states have internal predecessors, (127), 24 states have call successors, (24), 1 states have call predecessors, (24), 20 states have return successors, (32), 30 states have call predecessors, (32), 24 states have call successors, (32) [2021-11-13 02:33:56,141 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 96 transitions. [2021-11-13 02:33:56,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-13 02:33:56,143 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:33:56,143 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 15, 13, 13, 13, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:33:56,190 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-13 02:33:56,359 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-13 02:33:56,359 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:33:56,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:33:56,360 INFO L85 PathProgramCache]: Analyzing trace with hash -34520552, now seen corresponding path program 12 times [2021-11-13 02:33:56,360 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:33:56,360 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2043329012] [2021-11-13 02:33:56,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:33:56,360 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:33:56,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:33:58,453 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 572 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2021-11-13 02:33:58,453 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:33:58,454 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2043329012] [2021-11-13 02:33:58,454 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2043329012] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:33:58,454 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [374822963] [2021-11-13 02:33:58,454 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:33:58,454 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:33:58,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:33:58,455 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:33:58,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-13 02:33:58,564 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:33:58,564 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:33:58,568 WARN L261 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 181 conjunts are in the unsatisfiable core [2021-11-13 02:33:58,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:34:01,024 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 8 proven. 315 refuted. 0 times theorem prover too weak. 358 trivial. 0 not checked. [2021-11-13 02:34:01,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:34:26,566 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|aux_div_v_mult_#in~n_BEFORE_CALL_132_79|] [2021-11-13 02:34:26,566 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [185276930] [2021-11-13 02:34:26,568 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:34:26,568 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:34:26,569 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:34:26,589 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 02:34:26,589 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2021-11-13 02:34:26,589 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082122846] [2021-11-13 02:34:26,589 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 02:34:26,590 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-13 02:34:26,590 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:34:26,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-13 02:34:26,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=10343, Unknown=6, NotChecked=0, Total=10712 [2021-11-13 02:34:26,592 INFO L87 Difference]: Start difference. First operand 73 states and 96 transitions. Second operand has 51 states, 48 states have (on average 1.5833333333333333) internal successors, (76), 36 states have internal predecessors, (76), 15 states have call successors, (15), 1 states have call predecessors, (15), 14 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-13 02:34:31,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:34:31,061 INFO L93 Difference]: Finished difference Result 84 states and 113 transitions. [2021-11-13 02:34:31,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-13 02:34:31,062 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 48 states have (on average 1.5833333333333333) internal successors, (76), 36 states have internal predecessors, (76), 15 states have call successors, (15), 1 states have call predecessors, (15), 14 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) Word has length 110 [2021-11-13 02:34:31,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:34:31,063 INFO L225 Difference]: With dead ends: 84 [2021-11-13 02:34:31,063 INFO L226 Difference]: Without dead ends: 80 [2021-11-13 02:34:31,065 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 136 SyntacticMatches, 4 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3014 ImplicationChecksByTransitivity, 25.4s TimeCoverageRelationStatistics Valid=1145, Invalid=14349, Unknown=6, NotChecked=0, Total=15500 [2021-11-13 02:34:31,066 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 196 mSDsluCounter, 640 mSDsCounter, 0 mSdLazyCounter, 1503 mSolverCounterSat, 289 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1038.69ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 618 SdHoareTripleChecker+Invalid, 1792 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.52ms SdHoareTripleChecker+Time, 289 IncrementalHoareTripleChecker+Valid, 1503 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1190.46ms IncrementalHoareTripleChecker+Time [2021-11-13 02:34:31,066 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [198 Valid, 618 Invalid, 1792 Unknown, 0 Unchecked, 7.52ms Time], IncrementalHoareTripleChecker [289 Valid, 1503 Invalid, 0 Unknown, 0 Unchecked, 1190.46ms Time] [2021-11-13 02:34:31,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-13 02:34:31,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 76. [2021-11-13 02:34:31,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 52 states have internal predecessors, (55), 9 states have call successors, (9), 4 states have call predecessors, (9), 15 states have return successors, (42), 19 states have call predecessors, (42), 9 states have call successors, (42) [2021-11-13 02:34:31,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 106 transitions. [2021-11-13 02:34:31,078 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 106 transitions. Word has length 110 [2021-11-13 02:34:31,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:34:31,079 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 106 transitions. [2021-11-13 02:34:31,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 48 states have (on average 1.5833333333333333) internal successors, (76), 36 states have internal predecessors, (76), 15 states have call successors, (15), 1 states have call predecessors, (15), 14 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-13 02:34:31,080 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 106 transitions. [2021-11-13 02:34:31,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-13 02:34:31,081 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:34:31,081 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 10, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:34:31,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-13 02:34:31,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-13 02:34:31,297 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:34:31,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:34:31,298 INFO L85 PathProgramCache]: Analyzing trace with hash 1149449002, now seen corresponding path program 13 times [2021-11-13 02:34:31,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:34:31,298 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1905826344] [2021-11-13 02:34:31,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:34:31,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:34:31,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:34:33,006 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 350 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-13 02:34:33,007 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:34:33,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1905826344] [2021-11-13 02:34:33,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1905826344] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:34:33,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526450757] [2021-11-13 02:34:33,007 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:34:33,008 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:34:33,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:34:33,009 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:34:33,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-13 02:34:33,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:34:33,126 WARN L261 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 145 conjunts are in the unsatisfiable core [2021-11-13 02:34:33,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:34:35,278 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 8 proven. 201 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2021-11-13 02:34:35,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:34:41,031 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 35 proven. 315 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-13 02:34:41,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1526450757] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:34:41,032 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [475061528] [2021-11-13 02:34:41,033 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:34:41,034 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:34:41,034 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:34:41,034 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:34:41,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 26, 39] total 92 [2021-11-13 02:34:41,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638225069] [2021-11-13 02:34:41,035 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:34:41,035 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2021-11-13 02:34:41,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:34:41,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-11-13 02:34:41,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=315, Invalid=8057, Unknown=0, NotChecked=0, Total=8372 [2021-11-13 02:34:41,037 INFO L87 Difference]: Start difference. First operand 76 states and 106 transitions. Second operand has 92 states, 87 states have (on average 1.528735632183908) internal successors, (133), 59 states have internal predecessors, (133), 25 states have call successors, (25), 1 states have call predecessors, (25), 22 states have return successors, (34), 33 states have call predecessors, (34), 25 states have call successors, (34) [2021-11-13 02:34:44,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:34:44,265 INFO L93 Difference]: Finished difference Result 98 states and 131 transitions. [2021-11-13 02:34:44,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-13 02:34:44,266 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 87 states have (on average 1.528735632183908) internal successors, (133), 59 states have internal predecessors, (133), 25 states have call successors, (25), 1 states have call predecessors, (25), 22 states have return successors, (34), 33 states have call predecessors, (34), 25 states have call successors, (34) Word has length 89 [2021-11-13 02:34:44,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:34:44,267 INFO L225 Difference]: With dead ends: 98 [2021-11-13 02:34:44,267 INFO L226 Difference]: Without dead ends: 91 [2021-11-13 02:34:44,269 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 126 SyntacticMatches, 4 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3120 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=1306, Invalid=13700, Unknown=0, NotChecked=0, Total=15006 [2021-11-13 02:34:44,270 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 79 mSDsluCounter, 757 mSDsCounter, 0 mSdLazyCounter, 2400 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1325.94ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 734 SdHoareTripleChecker+Invalid, 2520 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.14ms SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 2400 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1523.42ms IncrementalHoareTripleChecker+Time [2021-11-13 02:34:44,270 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 734 Invalid, 2520 Unknown, 0 Unchecked, 11.14ms Time], IncrementalHoareTripleChecker [120 Valid, 2400 Invalid, 0 Unknown, 0 Unchecked, 1523.42ms Time] [2021-11-13 02:34:44,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-13 02:34:44,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 76. [2021-11-13 02:34:44,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 52 states have internal predecessors, (55), 9 states have call successors, (9), 4 states have call predecessors, (9), 15 states have return successors, (37), 19 states have call predecessors, (37), 9 states have call successors, (37) [2021-11-13 02:34:44,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 101 transitions. [2021-11-13 02:34:44,281 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 101 transitions. Word has length 89 [2021-11-13 02:34:44,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:34:44,282 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 101 transitions. [2021-11-13 02:34:44,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 87 states have (on average 1.528735632183908) internal successors, (133), 59 states have internal predecessors, (133), 25 states have call successors, (25), 1 states have call predecessors, (25), 22 states have return successors, (34), 33 states have call predecessors, (34), 25 states have call successors, (34) [2021-11-13 02:34:44,282 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 101 transitions. [2021-11-13 02:34:44,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-13 02:34:44,284 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:34:44,284 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 11, 11, 11, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:34:44,307 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-13 02:34:44,489 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:34:44,489 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:34:44,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:34:44,490 INFO L85 PathProgramCache]: Analyzing trace with hash -545950054, now seen corresponding path program 14 times [2021-11-13 02:34:44,490 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:34:44,490 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812306647] [2021-11-13 02:34:44,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:34:44,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:34:44,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:34:45,892 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 0 proven. 418 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-13 02:34:45,892 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:34:45,892 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812306647] [2021-11-13 02:34:45,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812306647] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:34:45,892 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [532215514] [2021-11-13 02:34:45,892 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:34:45,893 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:34:45,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:34:45,893 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:34:45,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-13 02:34:46,038 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-13 02:34:46,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:34:46,041 WARN L261 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 157 conjunts are in the unsatisfiable core [2021-11-13 02:34:46,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:34:47,765 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 5 proven. 233 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2021-11-13 02:34:47,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:35:17,773 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|aux_div_v_mult_#in~n_BEFORE_CALL_171_61|] [2021-11-13 02:35:17,774 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [751805860] [2021-11-13 02:35:17,775 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:35:17,775 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:35:17,776 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:35:17,777 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 02:35:17,777 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2021-11-13 02:35:17,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048662095] [2021-11-13 02:35:17,778 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 02:35:17,778 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-13 02:35:17,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:17,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-13 02:35:17,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=7338, Unknown=11, NotChecked=0, Total=7656 [2021-11-13 02:35:17,780 INFO L87 Difference]: Start difference. First operand 76 states and 101 transitions. Second operand has 45 states, 42 states have (on average 1.5714285714285714) internal successors, (66), 32 states have internal predecessors, (66), 13 states have call successors, (13), 1 states have call predecessors, (13), 12 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-13 02:35:20,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:35:20,682 INFO L93 Difference]: Finished difference Result 86 states and 111 transitions. [2021-11-13 02:35:20,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-13 02:35:20,683 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 42 states have (on average 1.5714285714285714) internal successors, (66), 32 states have internal predecessors, (66), 13 states have call successors, (13), 1 states have call predecessors, (13), 12 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Word has length 96 [2021-11-13 02:35:20,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:35:20,684 INFO L225 Difference]: With dead ends: 86 [2021-11-13 02:35:20,685 INFO L226 Difference]: Without dead ends: 82 [2021-11-13 02:35:20,686 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 111 SyntacticMatches, 4 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1991 ImplicationChecksByTransitivity, 30.0s TimeCoverageRelationStatistics Valid=860, Invalid=10049, Unknown=11, NotChecked=0, Total=10920 [2021-11-13 02:35:20,686 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 134 mSDsluCounter, 504 mSDsCounter, 0 mSdLazyCounter, 1079 mSolverCounterSat, 169 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 709.01ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 486 SdHoareTripleChecker+Invalid, 1248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.39ms SdHoareTripleChecker+Time, 169 IncrementalHoareTripleChecker+Valid, 1079 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 836.02ms IncrementalHoareTripleChecker+Time [2021-11-13 02:35:20,686 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 486 Invalid, 1248 Unknown, 0 Unchecked, 5.39ms Time], IncrementalHoareTripleChecker [169 Valid, 1079 Invalid, 0 Unknown, 0 Unchecked, 836.02ms Time] [2021-11-13 02:35:20,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-13 02:35:20,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 76. [2021-11-13 02:35:20,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 52 states have internal predecessors, (55), 9 states have call successors, (9), 4 states have call predecessors, (9), 15 states have return successors, (37), 19 states have call predecessors, (37), 9 states have call successors, (37) [2021-11-13 02:35:20,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 101 transitions. [2021-11-13 02:35:20,697 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 101 transitions. Word has length 96 [2021-11-13 02:35:20,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:35:20,698 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 101 transitions. [2021-11-13 02:35:20,698 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 42 states have (on average 1.5714285714285714) internal successors, (66), 32 states have internal predecessors, (66), 13 states have call successors, (13), 1 states have call predecessors, (13), 12 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-13 02:35:20,698 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 101 transitions. [2021-11-13 02:35:20,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-13 02:35:20,699 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:20,700 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 11, 11, 11, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:35:20,730 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-13 02:35:20,918 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-13 02:35:20,918 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:35:20,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:20,918 INFO L85 PathProgramCache]: Analyzing trace with hash -2050033702, now seen corresponding path program 15 times [2021-11-13 02:35:20,918 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:20,919 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406755256] [2021-11-13 02:35:20,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:20,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:20,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:22,692 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 0 proven. 418 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-13 02:35:22,693 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:35:22,693 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406755256] [2021-11-13 02:35:22,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406755256] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:35:22,693 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [118771258] [2021-11-13 02:35:22,693 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:35:22,693 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:22,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:35:22,694 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:35:22,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-13 02:35:22,816 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:35:22,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:35:22,820 WARN L261 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 157 conjunts are in the unsatisfiable core [2021-11-13 02:35:22,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:35:25,120 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 9 proven. 238 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-13 02:35:25,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:35:32,023 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 38 proven. 380 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-13 02:35:32,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [118771258] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:35:32,024 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [33291006] [2021-11-13 02:35:32,025 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:35:32,026 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:35:32,026 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:35:32,027 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:35:32,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 28, 42] total 99 [2021-11-13 02:35:32,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645240390] [2021-11-13 02:35:32,027 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:35:32,028 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2021-11-13 02:35:32,028 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:35:32,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2021-11-13 02:35:32,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=9363, Unknown=0, NotChecked=0, Total=9702 [2021-11-13 02:35:32,029 INFO L87 Difference]: Start difference. First operand 76 states and 101 transitions. Second operand has 99 states, 94 states have (on average 1.5319148936170213) internal successors, (144), 63 states have internal predecessors, (144), 27 states have call successors, (27), 1 states have call predecessors, (27), 24 states have return successors, (37), 36 states have call predecessors, (37), 27 states have call successors, (37) [2021-11-13 02:35:36,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:35:36,045 INFO L93 Difference]: Finished difference Result 101 states and 137 transitions. [2021-11-13 02:35:36,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-13 02:35:36,046 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 94 states have (on average 1.5319148936170213) internal successors, (144), 63 states have internal predecessors, (144), 27 states have call successors, (27), 1 states have call predecessors, (27), 24 states have return successors, (37), 36 states have call predecessors, (37), 27 states have call successors, (37) Word has length 96 [2021-11-13 02:35:36,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:35:36,047 INFO L225 Difference]: With dead ends: 101 [2021-11-13 02:35:36,047 INFO L226 Difference]: Without dead ends: 94 [2021-11-13 02:35:36,049 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 136 SyntacticMatches, 4 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3597 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=1463, Invalid=15829, Unknown=0, NotChecked=0, Total=17292 [2021-11-13 02:35:36,050 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 167 mSDsluCounter, 1051 mSDsCounter, 0 mSdLazyCounter, 3183 mSolverCounterSat, 284 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1814.49ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 1018 SdHoareTripleChecker+Invalid, 3467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 10.96ms SdHoareTripleChecker+Time, 284 IncrementalHoareTripleChecker+Valid, 3183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2096.76ms IncrementalHoareTripleChecker+Time [2021-11-13 02:35:36,050 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [169 Valid, 1018 Invalid, 3467 Unknown, 0 Unchecked, 10.96ms Time], IncrementalHoareTripleChecker [284 Valid, 3183 Invalid, 0 Unknown, 0 Unchecked, 2096.76ms Time] [2021-11-13 02:35:36,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-13 02:35:36,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 79. [2021-11-13 02:35:36,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 53 states have (on average 1.0754716981132075) internal successors, (57), 54 states have internal predecessors, (57), 9 states have call successors, (9), 4 states have call predecessors, (9), 16 states have return successors, (40), 20 states have call predecessors, (40), 9 states have call successors, (40) [2021-11-13 02:35:36,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 106 transitions. [2021-11-13 02:35:36,062 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 106 transitions. Word has length 96 [2021-11-13 02:35:36,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:35:36,062 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 106 transitions. [2021-11-13 02:35:36,063 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 94 states have (on average 1.5319148936170213) internal successors, (144), 63 states have internal predecessors, (144), 27 states have call successors, (27), 1 states have call predecessors, (27), 24 states have return successors, (37), 36 states have call predecessors, (37), 27 states have call successors, (37) [2021-11-13 02:35:36,063 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 106 transitions. [2021-11-13 02:35:36,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-13 02:35:36,064 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:35:36,064 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 14, 12, 12, 12, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:35:36,091 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-13 02:35:36,277 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-13 02:35:36,277 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:35:36,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:35:36,278 INFO L85 PathProgramCache]: Analyzing trace with hash -772884420, now seen corresponding path program 16 times [2021-11-13 02:35:36,278 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:35:36,278 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [533655620] [2021-11-13 02:35:36,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:35:36,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:35:36,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:38,109 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 0 proven. 492 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-13 02:35:38,109 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:35:38,109 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [533655620] [2021-11-13 02:35:38,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [533655620] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:35:38,109 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [59591090] [2021-11-13 02:35:38,109 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:35:38,110 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:35:38,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:35:38,111 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:35:38,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-13 02:35:38,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:35:38,247 WARN L261 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 169 conjunts are in the unsatisfiable core [2021-11-13 02:35:38,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:35:40,388 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 5 proven. 274 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-11-13 02:35:40,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:12,822 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_213_67_142_143|, |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_213_67_142_143|, |aux_div_v_mult_#in~n_BEFORE_CALL_213_67|] [2021-11-13 02:36:12,822 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1441598961] [2021-11-13 02:36:12,823 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:36:12,824 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:12,824 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:36:12,825 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 02:36:12,825 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2021-11-13 02:36:12,825 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085567521] [2021-11-13 02:36:12,826 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:12,826 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-13 02:36:12,826 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:12,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-13 02:36:12,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=322, Invalid=8227, Unknown=7, NotChecked=0, Total=8556 [2021-11-13 02:36:12,828 INFO L87 Difference]: Start difference. First operand 79 states and 106 transitions. Second operand has 48 states, 45 states have (on average 1.5777777777777777) internal successors, (71), 34 states have internal predecessors, (71), 14 states have call successors, (14), 1 states have call predecessors, (14), 13 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-13 02:36:16,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:16,089 INFO L93 Difference]: Finished difference Result 89 states and 116 transitions. [2021-11-13 02:36:16,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-13 02:36:16,089 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 45 states have (on average 1.5777777777777777) internal successors, (71), 34 states have internal predecessors, (71), 14 states have call successors, (14), 1 states have call predecessors, (14), 13 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Word has length 103 [2021-11-13 02:36:16,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:16,091 INFO L225 Difference]: With dead ends: 89 [2021-11-13 02:36:16,091 INFO L226 Difference]: Without dead ends: 85 [2021-11-13 02:36:16,092 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 115 SyntacticMatches, 5 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2282 ImplicationChecksByTransitivity, 30.0s TimeCoverageRelationStatistics Valid=960, Invalid=11465, Unknown=7, NotChecked=0, Total=12432 [2021-11-13 02:36:16,093 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 193 mSDsluCounter, 515 mSDsCounter, 0 mSdLazyCounter, 1226 mSolverCounterSat, 273 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 763.23ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 496 SdHoareTripleChecker+Invalid, 1499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.94ms SdHoareTripleChecker+Time, 273 IncrementalHoareTripleChecker+Valid, 1226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 871.27ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:16,093 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [195 Valid, 496 Invalid, 1499 Unknown, 0 Unchecked, 4.94ms Time], IncrementalHoareTripleChecker [273 Valid, 1226 Invalid, 0 Unknown, 0 Unchecked, 871.27ms Time] [2021-11-13 02:36:16,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-13 02:36:16,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 79. [2021-11-13 02:36:16,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 53 states have (on average 1.0754716981132075) internal successors, (57), 54 states have internal predecessors, (57), 9 states have call successors, (9), 4 states have call predecessors, (9), 16 states have return successors, (40), 20 states have call predecessors, (40), 9 states have call successors, (40) [2021-11-13 02:36:16,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 106 transitions. [2021-11-13 02:36:16,104 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 106 transitions. Word has length 103 [2021-11-13 02:36:16,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:16,105 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 106 transitions. [2021-11-13 02:36:16,105 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 45 states have (on average 1.5777777777777777) internal successors, (71), 34 states have internal predecessors, (71), 14 states have call successors, (14), 1 states have call predecessors, (14), 13 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-13 02:36:16,105 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 106 transitions. [2021-11-13 02:36:16,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-13 02:36:16,107 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:16,107 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 14, 12, 12, 12, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:36:16,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-13 02:36:16,333 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:16,333 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:36:16,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:16,333 INFO L85 PathProgramCache]: Analyzing trace with hash 1109932794, now seen corresponding path program 17 times [2021-11-13 02:36:16,334 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:16,334 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023701434] [2021-11-13 02:36:16,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:16,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:16,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:18,143 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 0 proven. 492 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-13 02:36:18,143 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:18,143 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023701434] [2021-11-13 02:36:18,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2023701434] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:18,144 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1643828528] [2021-11-13 02:36:18,144 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:36:18,144 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:18,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:18,149 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:18,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-13 02:36:18,312 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-13 02:36:18,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:36:18,316 WARN L261 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 169 conjunts are in the unsatisfiable core [2021-11-13 02:36:18,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:20,975 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 10 proven. 278 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked. [2021-11-13 02:36:20,975 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:36:29,506 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 41 proven. 451 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-13 02:36:29,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1643828528] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:36:29,506 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1887735242] [2021-11-13 02:36:29,508 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:36:29,508 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:36:29,508 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:36:29,508 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:36:29,508 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 30, 45] total 106 [2021-11-13 02:36:29,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173907433] [2021-11-13 02:36:29,509 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:36:29,509 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2021-11-13 02:36:29,509 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:36:29,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-11-13 02:36:29,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=10767, Unknown=0, NotChecked=0, Total=11130 [2021-11-13 02:36:29,511 INFO L87 Difference]: Start difference. First operand 79 states and 106 transitions. Second operand has 106 states, 101 states have (on average 1.5346534653465347) internal successors, (155), 67 states have internal predecessors, (155), 29 states have call successors, (29), 1 states have call predecessors, (29), 26 states have return successors, (40), 39 states have call predecessors, (40), 29 states have call successors, (40) [2021-11-13 02:36:33,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:36:33,801 INFO L93 Difference]: Finished difference Result 104 states and 142 transitions. [2021-11-13 02:36:33,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-13 02:36:33,801 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 101 states have (on average 1.5346534653465347) internal successors, (155), 67 states have internal predecessors, (155), 29 states have call successors, (29), 1 states have call predecessors, (29), 26 states have return successors, (40), 39 states have call predecessors, (40), 29 states have call successors, (40) Word has length 103 [2021-11-13 02:36:33,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:36:33,803 INFO L225 Difference]: With dead ends: 104 [2021-11-13 02:36:33,803 INFO L226 Difference]: Without dead ends: 97 [2021-11-13 02:36:33,805 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 146 SyntacticMatches, 4 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4109 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=1628, Invalid=18112, Unknown=0, NotChecked=0, Total=19740 [2021-11-13 02:36:33,805 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 338 mSDsluCounter, 924 mSDsCounter, 0 mSdLazyCounter, 3101 mSolverCounterSat, 626 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1859.29ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 342 SdHoareTripleChecker+Valid, 886 SdHoareTripleChecker+Invalid, 3727 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.34ms SdHoareTripleChecker+Time, 626 IncrementalHoareTripleChecker+Valid, 3101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2126.71ms IncrementalHoareTripleChecker+Time [2021-11-13 02:36:33,806 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [342 Valid, 886 Invalid, 3727 Unknown, 0 Unchecked, 11.34ms Time], IncrementalHoareTripleChecker [626 Valid, 3101 Invalid, 0 Unknown, 0 Unchecked, 2126.71ms Time] [2021-11-13 02:36:33,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-13 02:36:33,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 82. [2021-11-13 02:36:33,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 55 states have (on average 1.0727272727272728) internal successors, (59), 56 states have internal predecessors, (59), 9 states have call successors, (9), 4 states have call predecessors, (9), 17 states have return successors, (43), 21 states have call predecessors, (43), 9 states have call successors, (43) [2021-11-13 02:36:33,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 111 transitions. [2021-11-13 02:36:33,818 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 111 transitions. Word has length 103 [2021-11-13 02:36:33,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:36:33,818 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 111 transitions. [2021-11-13 02:36:33,819 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 101 states have (on average 1.5346534653465347) internal successors, (155), 67 states have internal predecessors, (155), 29 states have call successors, (29), 1 states have call predecessors, (29), 26 states have return successors, (40), 39 states have call predecessors, (40), 29 states have call successors, (40) [2021-11-13 02:36:33,819 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 111 transitions. [2021-11-13 02:36:33,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-13 02:36:33,820 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:36:33,820 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 15, 13, 13, 13, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:36:33,841 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-11-13 02:36:34,021 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:34,021 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:36:34,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:36:34,021 INFO L85 PathProgramCache]: Analyzing trace with hash 1650246186, now seen corresponding path program 18 times [2021-11-13 02:36:34,021 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:36:34,022 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [25515050] [2021-11-13 02:36:34,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:36:34,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:36:34,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:36:36,166 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 572 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2021-11-13 02:36:36,166 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:36:36,166 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [25515050] [2021-11-13 02:36:36,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [25515050] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:36:36,166 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1115509792] [2021-11-13 02:36:36,167 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:36:36,167 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:36:36,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:36:36,167 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:36:36,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-13 02:36:36,324 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:36:36,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:36:36,327 WARN L261 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 181 conjunts are in the unsatisfiable core [2021-11-13 02:36:36,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:36:38,698 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 5 proven. 318 refuted. 0 times theorem prover too weak. 358 trivial. 0 not checked. [2021-11-13 02:36:38,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:37:03,019 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_258_101_154_145|, |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_258_101_154_145|, |aux_div_v_mult_#in~n_BEFORE_CALL_258_101|] [2021-11-13 02:37:03,019 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1484336422] [2021-11-13 02:37:03,021 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:37:03,021 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:37:03,021 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:37:03,021 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 02:37:03,021 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2021-11-13 02:37:03,022 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888090465] [2021-11-13 02:37:03,022 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 02:37:03,022 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-13 02:37:03,022 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:37:03,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-13 02:37:03,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=9162, Unknown=7, NotChecked=0, Total=9506 [2021-11-13 02:37:03,023 INFO L87 Difference]: Start difference. First operand 82 states and 111 transitions. Second operand has 51 states, 48 states have (on average 1.5833333333333333) internal successors, (76), 36 states have internal predecessors, (76), 15 states have call successors, (15), 1 states have call predecessors, (15), 14 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-13 02:37:07,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:37:07,065 INFO L93 Difference]: Finished difference Result 92 states and 121 transitions. [2021-11-13 02:37:07,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-13 02:37:07,065 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 48 states have (on average 1.5833333333333333) internal successors, (76), 36 states have internal predecessors, (76), 15 states have call successors, (15), 1 states have call predecessors, (15), 14 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) Word has length 110 [2021-11-13 02:37:07,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:37:07,066 INFO L225 Difference]: With dead ends: 92 [2021-11-13 02:37:07,067 INFO L226 Difference]: Without dead ends: 88 [2021-11-13 02:37:07,067 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 121 SyntacticMatches, 4 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2485 ImplicationChecksByTransitivity, 25.2s TimeCoverageRelationStatistics Valid=1064, Invalid=12971, Unknown=7, NotChecked=0, Total=14042 [2021-11-13 02:37:07,068 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 209 mSDsluCounter, 545 mSDsCounter, 0 mSdLazyCounter, 1526 mSolverCounterSat, 306 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 970.99ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 522 SdHoareTripleChecker+Invalid, 1832 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.48ms SdHoareTripleChecker+Time, 306 IncrementalHoareTripleChecker+Valid, 1526 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1102.28ms IncrementalHoareTripleChecker+Time [2021-11-13 02:37:07,068 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 522 Invalid, 1832 Unknown, 0 Unchecked, 5.48ms Time], IncrementalHoareTripleChecker [306 Valid, 1526 Invalid, 0 Unknown, 0 Unchecked, 1102.28ms Time] [2021-11-13 02:37:07,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-13 02:37:07,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 82. [2021-11-13 02:37:07,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 55 states have (on average 1.0727272727272728) internal successors, (59), 56 states have internal predecessors, (59), 9 states have call successors, (9), 4 states have call predecessors, (9), 17 states have return successors, (43), 21 states have call predecessors, (43), 9 states have call successors, (43) [2021-11-13 02:37:07,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 111 transitions. [2021-11-13 02:37:07,079 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 111 transitions. Word has length 110 [2021-11-13 02:37:07,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:37:07,080 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 111 transitions. [2021-11-13 02:37:07,080 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 48 states have (on average 1.5833333333333333) internal successors, (76), 36 states have internal predecessors, (76), 15 states have call successors, (15), 1 states have call predecessors, (15), 14 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-13 02:37:07,080 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 111 transitions. [2021-11-13 02:37:07,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-13 02:37:07,081 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:37:07,082 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 15, 13, 13, 13, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:37:07,106 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-13 02:37:07,293 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-13 02:37:07,293 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:37:07,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:37:07,294 INFO L85 PathProgramCache]: Analyzing trace with hash 209449994, now seen corresponding path program 19 times [2021-11-13 02:37:07,294 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:37:07,294 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349682990] [2021-11-13 02:37:07,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:37:07,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:37:07,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:09,260 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 572 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2021-11-13 02:37:09,260 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:37:09,260 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349682990] [2021-11-13 02:37:09,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [349682990] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:37:09,260 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1256869299] [2021-11-13 02:37:09,260 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:37:09,261 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:09,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:37:09,261 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:37:09,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-13 02:37:09,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:09,426 WARN L261 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 181 conjunts are in the unsatisfiable core [2021-11-13 02:37:09,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:37:12,498 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 11 proven. 321 refuted. 0 times theorem prover too weak. 349 trivial. 0 not checked. [2021-11-13 02:37:12,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:37:25,165 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((|aux_div_v_mult_#in~n_BEFORE_CALL_285_81| Int) (|aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| Int) (|aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133| Int) (|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| Int) (v_mult_~n_BEFORE_CALL_285 Int)) (let ((.cse4 (* 11 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137|))) (let ((.cse3 (* 11 |aux_div_v_mult_#in~n_BEFORE_CALL_285_81|)) (.cse2 (+ |c_mult_#res| |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| .cse4)) (.cse0 (div (+ (- 1) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| (- 2)) (* v_mult_~n_BEFORE_CALL_285 2) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| (- 22))) (- 11))) (.cse1 (div (+ (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| 22) (- 1) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| 2) (* v_mult_~n_BEFORE_CALL_285 (- 2))) 11))) (or (< .cse0 (+ 2 .cse1)) (< .cse2 .cse3) (<= .cse0 (+ |aux_div_v_mult_#in~n_BEFORE_CALL_285_81| 1)) (< |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| 0) (< (* 11 |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133|) (+ |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| .cse4)) (<= (+ .cse3 11) .cse2) (< (+ 1 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137|) .cse0) (< (+ .cse1 1) |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133|))))) (<= 0 |c_mult_#in~m|) (forall ((|aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| Int) (|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| Int) (|aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125| Int) (|aux_div_v_mult_#in~n_BEFORE_CALL_285_115| Int) (v_mult_~n_BEFORE_CALL_285 Int)) (let ((.cse10 (div (+ (- 1) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 22) (* v_mult_~n_BEFORE_CALL_285 (- 2)) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 2)) 11))) (let ((.cse5 (* 11 |aux_div_v_mult_#in~n_BEFORE_CALL_285_115|)) (.cse7 (div (+ (- 1) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| (- 22)) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| (- 2)) (* v_mult_~n_BEFORE_CALL_285 2)) (- 11))) (.cse8 (+ .cse10 1)) (.cse6 (* 11 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139|)) (.cse9 (* 11 |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125|))) (or (< .cse5 (+ |c_mult_#res| .cse6 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139|)) (<= 11 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139|) (< (+ |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 1) .cse7) (<= (+ |c_mult_#res| .cse6 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 11) .cse5) (< .cse8 |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125|) (< .cse9 (+ .cse6 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139|)) (< .cse7 (+ 2 .cse10)) (< |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 0) (<= |aux_div_v_mult_#in~n_BEFORE_CALL_285_115| .cse8) (<= (+ .cse6 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 11) .cse9))))) (<= |c_mult_#in~m| 0)) is different from false [2021-11-13 02:37:27,589 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((|aux_div_v_mult_#in~n_BEFORE_CALL_285_81| Int) (|aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| Int) (|aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133| Int) (|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| Int) (v_mult_~n_BEFORE_CALL_285 Int)) (let ((.cse4 (* 11 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137|))) (let ((.cse3 (* 11 |aux_div_v_mult_#in~n_BEFORE_CALL_285_81|)) (.cse2 (+ |c_mult_#res| |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| .cse4)) (.cse0 (div (+ (- 1) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| (- 2)) (* v_mult_~n_BEFORE_CALL_285 2) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| (- 22))) (- 11))) (.cse1 (div (+ (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| 22) (- 1) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| 2) (* v_mult_~n_BEFORE_CALL_285 (- 2))) 11))) (or (< .cse0 (+ 2 .cse1)) (< .cse2 .cse3) (<= .cse0 (+ |aux_div_v_mult_#in~n_BEFORE_CALL_285_81| 1)) (< |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| 0) (< (* 11 |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133|) (+ |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| .cse4)) (<= (+ .cse3 11) .cse2) (< (+ 1 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137|) .cse0) (< (+ .cse1 1) |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133|))))) (forall ((|aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| Int) (|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| Int) (|aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125| Int) (|aux_div_v_mult_#in~n_BEFORE_CALL_285_115| Int) (v_mult_~n_BEFORE_CALL_285 Int)) (let ((.cse9 (div (+ (- 1) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 22) (* v_mult_~n_BEFORE_CALL_285 (- 2)) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 2)) 11))) (let ((.cse5 (* 11 |aux_div_v_mult_#in~n_BEFORE_CALL_285_115|)) (.cse6 (* 11 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139|)) (.cse7 (div (+ (- 1) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| (- 22)) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| (- 2)) (* v_mult_~n_BEFORE_CALL_285 2)) (- 11))) (.cse8 (+ .cse9 1))) (or (< .cse5 (+ |c_mult_#res| .cse6 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139|)) (< (+ |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 1) .cse7) (<= (+ |c_mult_#res| .cse6 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 11) .cse5) (< .cse8 |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125|) (< (* 11 |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125|) (+ .cse6 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139|)) (< .cse7 (+ 2 .cse9)) (< |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 0) (<= |aux_div_v_mult_#in~n_BEFORE_CALL_285_115| .cse8))))) (<= 0 |c_mult_#in~m|) (<= |c_mult_#in~m| 0)) is different from false [2021-11-13 02:37:27,834 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 44 proven. 502 refuted. 0 times theorem prover too weak. 107 trivial. 28 not checked. [2021-11-13 02:37:27,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1256869299] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:37:27,835 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [200927930] [2021-11-13 02:37:27,836 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:37:27,836 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:37:27,837 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:37:27,838 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:37:27,838 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 32, 50] total 115 [2021-11-13 02:37:27,838 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877668907] [2021-11-13 02:37:27,839 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:37:27,840 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2021-11-13 02:37:27,840 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:37:27,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2021-11-13 02:37:27,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=391, Invalid=12271, Unknown=2, NotChecked=446, Total=13110 [2021-11-13 02:37:27,847 INFO L87 Difference]: Start difference. First operand 82 states and 111 transitions. Second operand has 115 states, 109 states have (on average 1.5412844036697249) internal successors, (168), 73 states have internal predecessors, (168), 31 states have call successors, (31), 1 states have call predecessors, (31), 29 states have return successors, (43), 42 states have call predecessors, (43), 31 states have call successors, (43) [2021-11-13 02:37:33,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:37:33,688 INFO L93 Difference]: Finished difference Result 107 states and 147 transitions. [2021-11-13 02:37:33,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-13 02:37:33,689 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 109 states have (on average 1.5412844036697249) internal successors, (168), 73 states have internal predecessors, (168), 31 states have call successors, (31), 1 states have call predecessors, (31), 29 states have return successors, (43), 42 states have call predecessors, (43), 31 states have call successors, (43) Word has length 110 [2021-11-13 02:37:33,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:37:33,691 INFO L225 Difference]: With dead ends: 107 [2021-11-13 02:37:33,691 INFO L226 Difference]: Without dead ends: 100 [2021-11-13 02:37:33,694 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 155 SyntacticMatches, 4 SemanticMatches, 150 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 4627 ImplicationChecksByTransitivity, 15.0s TimeCoverageRelationStatistics Valid=1805, Invalid=20551, Unknown=2, NotChecked=594, Total=22952 [2021-11-13 02:37:33,694 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 110 mSDsluCounter, 1052 mSDsCounter, 0 mSdLazyCounter, 3582 mSolverCounterSat, 195 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2391.23ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 1007 SdHoareTripleChecker+Invalid, 3925 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 15.34ms SdHoareTripleChecker+Time, 195 IncrementalHoareTripleChecker+Valid, 3582 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 148 IncrementalHoareTripleChecker+Unchecked, 2743.28ms IncrementalHoareTripleChecker+Time [2021-11-13 02:37:33,695 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 1007 Invalid, 3925 Unknown, 0 Unchecked, 15.34ms Time], IncrementalHoareTripleChecker [195 Valid, 3582 Invalid, 0 Unknown, 148 Unchecked, 2743.28ms Time] [2021-11-13 02:37:33,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-13 02:37:33,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 85. [2021-11-13 02:37:33,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 57 states have (on average 1.0701754385964912) internal successors, (61), 58 states have internal predecessors, (61), 9 states have call successors, (9), 4 states have call predecessors, (9), 18 states have return successors, (46), 22 states have call predecessors, (46), 9 states have call successors, (46) [2021-11-13 02:37:33,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 116 transitions. [2021-11-13 02:37:33,709 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 116 transitions. Word has length 110 [2021-11-13 02:37:33,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:37:33,710 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 116 transitions. [2021-11-13 02:37:33,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 109 states have (on average 1.5412844036697249) internal successors, (168), 73 states have internal predecessors, (168), 31 states have call successors, (31), 1 states have call predecessors, (31), 29 states have return successors, (43), 42 states have call predecessors, (43), 31 states have call successors, (43) [2021-11-13 02:37:33,711 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 116 transitions. [2021-11-13 02:37:33,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-13 02:37:33,712 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:37:33,712 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 16, 14, 14, 14, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:37:33,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-13 02:37:33,925 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-13 02:37:33,925 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:37:33,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:37:33,926 INFO L85 PathProgramCache]: Analyzing trace with hash -736446292, now seen corresponding path program 20 times [2021-11-13 02:37:33,926 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:37:33,926 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535796636] [2021-11-13 02:37:33,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:37:33,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:37:33,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:37:36,869 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 658 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2021-11-13 02:37:36,869 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:37:36,869 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535796636] [2021-11-13 02:37:36,869 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535796636] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:37:36,869 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1841024680] [2021-11-13 02:37:36,870 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:37:36,870 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:37:36,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:37:36,871 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:37:36,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-13 02:37:37,093 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-13 02:37:37,093 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:37:37,098 WARN L261 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 193 conjunts are in the unsatisfiable core [2021-11-13 02:37:37,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:37:40,486 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 5 proven. 366 refuted. 0 times theorem prover too weak. 411 trivial. 0 not checked. [2021-11-13 02:37:40,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:38:14,562 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_306_101_146_137|, |aux_div_v_mult_#in~n_BEFORE_CALL_306_101|, |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_306_101_146_137|] [2021-11-13 02:38:14,563 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [447145216] [2021-11-13 02:38:14,564 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:38:14,565 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:38:14,565 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:38:14,569 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 02:38:14,569 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2021-11-13 02:38:14,569 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934988002] [2021-11-13 02:38:14,569 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 02:38:14,572 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-13 02:38:14,572 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:38:14,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-13 02:38:14,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=347, Invalid=9947, Unknown=8, NotChecked=0, Total=10302 [2021-11-13 02:38:14,573 INFO L87 Difference]: Start difference. First operand 85 states and 116 transitions. Second operand has 54 states, 51 states have (on average 1.588235294117647) internal successors, (81), 38 states have internal predecessors, (81), 16 states have call successors, (16), 1 states have call predecessors, (16), 15 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-13 02:38:20,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:38:20,478 INFO L93 Difference]: Finished difference Result 95 states and 126 transitions. [2021-11-13 02:38:20,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-13 02:38:20,479 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 51 states have (on average 1.588235294117647) internal successors, (81), 38 states have internal predecessors, (81), 16 states have call successors, (16), 1 states have call predecessors, (16), 15 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) Word has length 117 [2021-11-13 02:38:20,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:38:20,481 INFO L225 Difference]: With dead ends: 95 [2021-11-13 02:38:20,481 INFO L226 Difference]: Without dead ends: 91 [2021-11-13 02:38:20,483 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 120 SyntacticMatches, 11 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2963 ImplicationChecksByTransitivity, 37.2s TimeCoverageRelationStatistics Valid=1148, Invalid=14344, Unknown=8, NotChecked=0, Total=15500 [2021-11-13 02:38:20,484 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 231 mSDsluCounter, 752 mSDsCounter, 0 mSdLazyCounter, 1747 mSolverCounterSat, 340 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1378.31ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 232 SdHoareTripleChecker+Valid, 730 SdHoareTripleChecker+Invalid, 2087 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.75ms SdHoareTripleChecker+Time, 340 IncrementalHoareTripleChecker+Valid, 1747 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1575.56ms IncrementalHoareTripleChecker+Time [2021-11-13 02:38:20,485 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [232 Valid, 730 Invalid, 2087 Unknown, 0 Unchecked, 9.75ms Time], IncrementalHoareTripleChecker [340 Valid, 1747 Invalid, 0 Unknown, 0 Unchecked, 1575.56ms Time] [2021-11-13 02:38:20,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-13 02:38:20,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 85. [2021-11-13 02:38:20,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 57 states have (on average 1.0701754385964912) internal successors, (61), 58 states have internal predecessors, (61), 9 states have call successors, (9), 4 states have call predecessors, (9), 18 states have return successors, (46), 22 states have call predecessors, (46), 9 states have call successors, (46) [2021-11-13 02:38:20,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 116 transitions. [2021-11-13 02:38:20,499 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 116 transitions. Word has length 117 [2021-11-13 02:38:20,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:38:20,500 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 116 transitions. [2021-11-13 02:38:20,500 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 51 states have (on average 1.588235294117647) internal successors, (81), 38 states have internal predecessors, (81), 16 states have call successors, (16), 1 states have call predecessors, (16), 15 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-13 02:38:20,500 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 116 transitions. [2021-11-13 02:38:20,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-13 02:38:20,502 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:38:20,502 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 19, 17, 17, 17, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:38:20,533 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2021-11-13 02:38:20,709 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-13 02:38:20,709 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:38:20,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:38:20,710 INFO L85 PathProgramCache]: Analyzing trace with hash -1578010440, now seen corresponding path program 21 times [2021-11-13 02:38:20,710 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:38:20,710 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486441016] [2021-11-13 02:38:20,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:38:20,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:38:20,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:38:24,284 INFO L134 CoverageAnalysis]: Checked inductivity of 1127 backedges. 0 proven. 952 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2021-11-13 02:38:24,284 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:38:24,284 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486441016] [2021-11-13 02:38:24,284 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [486441016] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:38:24,284 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1291539912] [2021-11-13 02:38:24,284 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:38:24,284 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:38:24,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:38:24,285 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:38:24,287 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-13 02:38:24,505 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:38:24,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:38:24,509 WARN L261 TraceCheckSpWp]: Trace formula consists of 412 conjuncts, 229 conjunts are in the unsatisfiable core [2021-11-13 02:38:24,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:38:29,042 INFO L134 CoverageAnalysis]: Checked inductivity of 1127 backedges. 12 proven. 517 refuted. 0 times theorem prover too weak. 598 trivial. 0 not checked. [2021-11-13 02:38:29,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:39:02,048 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|aux_div_v_mult_#in~n_BEFORE_CALL_338_68|, |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_338_68_144_145|, |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_338_68_144_145|] [2021-11-13 02:39:02,049 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1373238098] [2021-11-13 02:39:02,050 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:39:02,050 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:39:02,050 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:39:02,057 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 02:39:02,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2021-11-13 02:39:02,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616296827] [2021-11-13 02:39:02,057 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 02:39:02,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-13 02:39:02,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:39:02,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-13 02:39:02,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=459, Invalid=16826, Unknown=7, NotChecked=0, Total=17292 [2021-11-13 02:39:02,060 INFO L87 Difference]: Start difference. First operand 85 states and 116 transitions. Second operand has 63 states, 60 states have (on average 1.6) internal successors, (96), 44 states have internal predecessors, (96), 19 states have call successors, (19), 1 states have call predecessors, (19), 18 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-13 02:39:11,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:39:11,182 INFO L93 Difference]: Finished difference Result 98 states and 137 transitions. [2021-11-13 02:39:11,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-13 02:39:11,183 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 60 states have (on average 1.6) internal successors, (96), 44 states have internal predecessors, (96), 19 states have call successors, (19), 1 states have call predecessors, (19), 18 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) Word has length 138 [2021-11-13 02:39:11,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:39:11,184 INFO L225 Difference]: With dead ends: 98 [2021-11-13 02:39:11,184 INFO L226 Difference]: Without dead ends: 94 [2021-11-13 02:39:11,187 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 176 SyntacticMatches, 4 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5206 ImplicationChecksByTransitivity, 35.6s TimeCoverageRelationStatistics Valid=1769, Invalid=23984, Unknown=7, NotChecked=0, Total=25760 [2021-11-13 02:39:11,188 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 341 mSDsluCounter, 1007 mSDsCounter, 0 mSdLazyCounter, 2534 mSolverCounterSat, 546 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2068.45ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 342 SdHoareTripleChecker+Valid, 979 SdHoareTripleChecker+Invalid, 3080 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 14.33ms SdHoareTripleChecker+Time, 546 IncrementalHoareTripleChecker+Valid, 2534 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2353.19ms IncrementalHoareTripleChecker+Time [2021-11-13 02:39:11,189 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [342 Valid, 979 Invalid, 3080 Unknown, 0 Unchecked, 14.33ms Time], IncrementalHoareTripleChecker [546 Valid, 2534 Invalid, 0 Unknown, 0 Unchecked, 2353.19ms Time] [2021-11-13 02:39:11,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-13 02:39:11,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 90. [2021-11-13 02:39:11,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 60 states have (on average 1.0666666666666667) internal successors, (64), 61 states have internal predecessors, (64), 10 states have call successors, (10), 4 states have call predecessors, (10), 19 states have return successors, (56), 24 states have call predecessors, (56), 10 states have call successors, (56) [2021-11-13 02:39:11,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 130 transitions. [2021-11-13 02:39:11,206 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 130 transitions. Word has length 138 [2021-11-13 02:39:11,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:39:11,207 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 130 transitions. [2021-11-13 02:39:11,207 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 60 states have (on average 1.6) internal successors, (96), 44 states have internal predecessors, (96), 19 states have call successors, (19), 1 states have call predecessors, (19), 18 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-13 02:39:11,207 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 130 transitions. [2021-11-13 02:39:11,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-13 02:39:11,209 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:39:11,209 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 20, 18, 18, 18, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:39:11,257 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-13 02:39:11,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:39:11,425 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:39:11,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:39:11,426 INFO L85 PathProgramCache]: Analyzing trace with hash 72187818, now seen corresponding path program 22 times [2021-11-13 02:39:11,426 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:39:11,426 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370578737] [2021-11-13 02:39:11,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:39:11,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:39:11,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:39:14,982 INFO L134 CoverageAnalysis]: Checked inductivity of 1256 backedges. 1 proven. 1055 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-13 02:39:14,982 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:39:14,982 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370578737] [2021-11-13 02:39:14,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [370578737] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:39:14,982 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1539597153] [2021-11-13 02:39:14,982 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:39:14,983 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:39:14,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:39:14,991 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:39:14,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-13 02:39:15,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:39:15,212 WARN L261 TraceCheckSpWp]: Trace formula consists of 431 conjuncts, 241 conjunts are in the unsatisfiable core [2021-11-13 02:39:15,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:39:19,133 INFO L134 CoverageAnalysis]: Checked inductivity of 1256 backedges. 12 proven. 573 refuted. 0 times theorem prover too weak. 671 trivial. 0 not checked. [2021-11-13 02:39:19,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:39:55,178 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_371_68_156_137|, |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_371_68_156_137|, |aux_div_v_mult_#in~n_BEFORE_CALL_371_68|] [2021-11-13 02:39:55,179 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [241554711] [2021-11-13 02:39:55,180 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:39:55,181 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:39:55,182 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:39:55,183 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 02:39:55,183 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64] total 64 [2021-11-13 02:39:55,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2039667773] [2021-11-13 02:39:55,184 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 02:39:55,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-13 02:39:55,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:39:55,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-13 02:39:55,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=17081, Unknown=8, NotChecked=0, Total=17556 [2021-11-13 02:39:55,193 INFO L87 Difference]: Start difference. First operand 90 states and 130 transitions. Second operand has 64 states, 61 states have (on average 1.5573770491803278) internal successors, (95), 44 states have internal predecessors, (95), 18 states have call successors, (18), 1 states have call predecessors, (18), 19 states have return successors, (20), 20 states have call predecessors, (20), 18 states have call successors, (20) [2021-11-13 02:40:03,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:40:03,673 INFO L93 Difference]: Finished difference Result 100 states and 140 transitions. [2021-11-13 02:40:03,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-13 02:40:03,673 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 61 states have (on average 1.5573770491803278) internal successors, (95), 44 states have internal predecessors, (95), 18 states have call successors, (18), 1 states have call predecessors, (18), 19 states have return successors, (20), 20 states have call predecessors, (20), 18 states have call successors, (20) Word has length 145 [2021-11-13 02:40:03,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:40:03,674 INFO L225 Difference]: With dead ends: 100 [2021-11-13 02:40:03,675 INFO L226 Difference]: Without dead ends: 96 [2021-11-13 02:40:03,677 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 185 SyntacticMatches, 4 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5310 ImplicationChecksByTransitivity, 38.0s TimeCoverageRelationStatistics Valid=1757, Invalid=24317, Unknown=8, NotChecked=0, Total=26082 [2021-11-13 02:40:03,677 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 294 mSDsluCounter, 1050 mSDsCounter, 0 mSdLazyCounter, 2639 mSolverCounterSat, 468 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2073.25ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 295 SdHoareTripleChecker+Valid, 1020 SdHoareTripleChecker+Invalid, 3107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 14.03ms SdHoareTripleChecker+Time, 468 IncrementalHoareTripleChecker+Valid, 2639 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2357.20ms IncrementalHoareTripleChecker+Time [2021-11-13 02:40:03,677 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [295 Valid, 1020 Invalid, 3107 Unknown, 0 Unchecked, 14.03ms Time], IncrementalHoareTripleChecker [468 Valid, 2639 Invalid, 0 Unknown, 0 Unchecked, 2357.20ms Time] [2021-11-13 02:40:03,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-13 02:40:03,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 90. [2021-11-13 02:40:03,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 60 states have (on average 1.0666666666666667) internal successors, (64), 61 states have internal predecessors, (64), 10 states have call successors, (10), 4 states have call predecessors, (10), 19 states have return successors, (56), 24 states have call predecessors, (56), 10 states have call successors, (56) [2021-11-13 02:40:03,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 130 transitions. [2021-11-13 02:40:03,695 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 130 transitions. Word has length 145 [2021-11-13 02:40:03,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:40:03,695 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 130 transitions. [2021-11-13 02:40:03,696 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 61 states have (on average 1.5573770491803278) internal successors, (95), 44 states have internal predecessors, (95), 18 states have call successors, (18), 1 states have call predecessors, (18), 19 states have return successors, (20), 20 states have call predecessors, (20), 18 states have call successors, (20) [2021-11-13 02:40:03,696 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 130 transitions. [2021-11-13 02:40:03,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-13 02:40:03,698 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:40:03,698 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 16, 14, 14, 14, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:40:03,741 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-13 02:40:03,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-13 02:40:03,911 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:40:03,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:40:03,912 INFO L85 PathProgramCache]: Analyzing trace with hash 1925053130, now seen corresponding path program 23 times [2021-11-13 02:40:03,912 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:40:03,912 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045063987] [2021-11-13 02:40:03,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:40:03,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:40:03,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:40:06,934 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 658 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2021-11-13 02:40:06,935 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:40:06,935 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045063987] [2021-11-13 02:40:06,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2045063987] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:40:06,936 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1739390435] [2021-11-13 02:40:06,936 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:40:06,936 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:40:06,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:40:06,943 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:40:06,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-13 02:40:07,229 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-13 02:40:07,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:40:07,234 WARN L261 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 193 conjunts are in the unsatisfiable core [2021-11-13 02:40:07,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:40:11,464 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 12 proven. 367 refuted. 0 times theorem prover too weak. 403 trivial. 0 not checked. [2021-11-13 02:40:11,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:40:23,292 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 47 proven. 611 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2021-11-13 02:40:23,293 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1739390435] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:40:23,293 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [959063160] [2021-11-13 02:40:23,294 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:40:23,294 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:40:23,295 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:40:23,297 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:40:23,298 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 34, 51] total 120 [2021-11-13 02:40:23,298 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295976580] [2021-11-13 02:40:23,298 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:40:23,299 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 120 states [2021-11-13 02:40:23,299 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:40:23,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2021-11-13 02:40:23,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=411, Invalid=13869, Unknown=0, NotChecked=0, Total=14280 [2021-11-13 02:40:23,301 INFO L87 Difference]: Start difference. First operand 90 states and 130 transitions. Second operand has 120 states, 115 states have (on average 1.5391304347826087) internal successors, (177), 75 states have internal predecessors, (177), 33 states have call successors, (33), 1 states have call predecessors, (33), 30 states have return successors, (46), 45 states have call predecessors, (46), 33 states have call successors, (46) [2021-11-13 02:40:29,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:40:29,404 INFO L93 Difference]: Finished difference Result 112 states and 155 transitions. [2021-11-13 02:40:29,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-13 02:40:29,405 INFO L78 Accepts]: Start accepts. Automaton has has 120 states, 115 states have (on average 1.5391304347826087) internal successors, (177), 75 states have internal predecessors, (177), 33 states have call successors, (33), 1 states have call predecessors, (33), 30 states have return successors, (46), 45 states have call predecessors, (46), 33 states have call successors, (46) Word has length 117 [2021-11-13 02:40:29,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:40:29,407 INFO L225 Difference]: With dead ends: 112 [2021-11-13 02:40:29,407 INFO L226 Difference]: Without dead ends: 105 [2021-11-13 02:40:29,410 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 166 SyntacticMatches, 4 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5236 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=1982, Invalid=23140, Unknown=0, NotChecked=0, Total=25122 [2021-11-13 02:40:29,411 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 144 mSDsluCounter, 1287 mSDsCounter, 0 mSdLazyCounter, 4120 mSolverCounterSat, 248 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2765.87ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 1247 SdHoareTripleChecker+Invalid, 4368 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 17.00ms SdHoareTripleChecker+Time, 248 IncrementalHoareTripleChecker+Valid, 4120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3133.09ms IncrementalHoareTripleChecker+Time [2021-11-13 02:40:29,412 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [146 Valid, 1247 Invalid, 4368 Unknown, 0 Unchecked, 17.00ms Time], IncrementalHoareTripleChecker [248 Valid, 4120 Invalid, 0 Unknown, 0 Unchecked, 3133.09ms Time] [2021-11-13 02:40:29,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-13 02:40:29,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 88. [2021-11-13 02:40:29,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 59 states have (on average 1.0677966101694916) internal successors, (63), 60 states have internal predecessors, (63), 9 states have call successors, (9), 4 states have call predecessors, (9), 19 states have return successors, (49), 23 states have call predecessors, (49), 9 states have call successors, (49) [2021-11-13 02:40:29,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 121 transitions. [2021-11-13 02:40:29,427 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 121 transitions. Word has length 117 [2021-11-13 02:40:29,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:40:29,428 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 121 transitions. [2021-11-13 02:40:29,428 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 120 states, 115 states have (on average 1.5391304347826087) internal successors, (177), 75 states have internal predecessors, (177), 33 states have call successors, (33), 1 states have call predecessors, (33), 30 states have return successors, (46), 45 states have call predecessors, (46), 33 states have call successors, (46) [2021-11-13 02:40:29,428 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 121 transitions. [2021-11-13 02:40:29,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-13 02:40:29,430 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:40:29,430 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 17, 15, 15, 15, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:40:29,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-13 02:40:29,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-13 02:40:29,657 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:40:29,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:40:29,658 INFO L85 PathProgramCache]: Analyzing trace with hash -124701254, now seen corresponding path program 24 times [2021-11-13 02:40:29,658 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:40:29,658 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631676363] [2021-11-13 02:40:29,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:40:29,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:40:29,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:40:32,604 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 1 proven. 746 refuted. 0 times theorem prover too weak. 143 trivial. 0 not checked. [2021-11-13 02:40:32,604 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:40:32,605 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631676363] [2021-11-13 02:40:32,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1631676363] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:40:32,605 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1791391067] [2021-11-13 02:40:32,605 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:40:32,605 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:40:32,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:40:32,606 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:40:32,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-13 02:40:32,869 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:40:32,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:40:32,873 WARN L261 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 205 conjunts are in the unsatisfiable core [2021-11-13 02:40:32,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:40:36,668 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 5 proven. 415 refuted. 0 times theorem prover too weak. 470 trivial. 0 not checked. [2021-11-13 02:40:36,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:40:46,698 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 17 proven. 703 refuted. 0 times theorem prover too weak. 170 trivial. 0 not checked. [2021-11-13 02:40:46,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1791391067] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:40:46,698 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [60040501] [2021-11-13 02:40:46,700 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:40:46,700 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:40:46,700 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:40:46,700 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:40:46,701 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 30, 39] total 109 [2021-11-13 02:40:46,701 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524688570] [2021-11-13 02:40:46,701 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:40:46,701 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2021-11-13 02:40:46,702 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:40:46,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-11-13 02:40:46,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=11388, Unknown=0, NotChecked=0, Total=11772 [2021-11-13 02:40:46,703 INFO L87 Difference]: Start difference. First operand 88 states and 121 transitions. Second operand has 109 states, 104 states have (on average 1.5192307692307692) internal successors, (158), 69 states have internal predecessors, (158), 29 states have call successors, (29), 1 states have call predecessors, (29), 28 states have return successors, (41), 40 states have call predecessors, (41), 29 states have call successors, (41) [2021-11-13 02:40:52,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:40:52,525 INFO L93 Difference]: Finished difference Result 117 states and 165 transitions. [2021-11-13 02:40:52,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-13 02:40:52,525 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 104 states have (on average 1.5192307692307692) internal successors, (158), 69 states have internal predecessors, (158), 29 states have call successors, (29), 1 states have call predecessors, (29), 28 states have return successors, (41), 40 states have call predecessors, (41), 29 states have call successors, (41) Word has length 124 [2021-11-13 02:40:52,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:40:52,527 INFO L225 Difference]: With dead ends: 117 [2021-11-13 02:40:52,527 INFO L226 Difference]: Without dead ends: 99 [2021-11-13 02:40:52,529 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 194 SyntacticMatches, 4 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4326 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=2102, Invalid=20850, Unknown=0, NotChecked=0, Total=22952 [2021-11-13 02:40:52,530 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 261 mSDsluCounter, 857 mSDsCounter, 0 mSdLazyCounter, 3613 mSolverCounterSat, 519 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2296.58ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 263 SdHoareTripleChecker+Valid, 826 SdHoareTripleChecker+Invalid, 4132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 14.13ms SdHoareTripleChecker+Time, 519 IncrementalHoareTripleChecker+Valid, 3613 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2624.79ms IncrementalHoareTripleChecker+Time [2021-11-13 02:40:52,531 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [263 Valid, 826 Invalid, 4132 Unknown, 0 Unchecked, 14.13ms Time], IncrementalHoareTripleChecker [519 Valid, 3613 Invalid, 0 Unknown, 0 Unchecked, 2624.79ms Time] [2021-11-13 02:40:52,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-13 02:40:52,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 86. [2021-11-13 02:40:52,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 58 states have (on average 1.0689655172413792) internal successors, (62), 59 states have internal predecessors, (62), 8 states have call successors, (8), 4 states have call predecessors, (8), 19 states have return successors, (47), 22 states have call predecessors, (47), 8 states have call successors, (47) [2021-11-13 02:40:52,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 117 transitions. [2021-11-13 02:40:52,543 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 117 transitions. Word has length 124 [2021-11-13 02:40:52,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:40:52,544 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 117 transitions. [2021-11-13 02:40:52,544 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 104 states have (on average 1.5192307692307692) internal successors, (158), 69 states have internal predecessors, (158), 29 states have call successors, (29), 1 states have call predecessors, (29), 28 states have return successors, (41), 40 states have call predecessors, (41), 29 states have call successors, (41) [2021-11-13 02:40:52,544 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 117 transitions. [2021-11-13 02:40:52,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-13 02:40:52,546 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:40:52,546 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 17, 15, 15, 15, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:40:52,584 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-13 02:40:52,761 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:40:52,761 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:40:52,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:40:52,761 INFO L85 PathProgramCache]: Analyzing trace with hash 430880826, now seen corresponding path program 25 times [2021-11-13 02:40:52,762 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:40:52,762 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2025126499] [2021-11-13 02:40:52,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:40:52,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:40:52,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:40:55,658 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 0 proven. 750 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-11-13 02:40:55,658 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:40:55,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2025126499] [2021-11-13 02:40:55,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2025126499] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:40:55,662 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [280690293] [2021-11-13 02:40:55,662 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:40:55,662 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:40:55,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:40:55,663 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:40:55,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-13 02:40:55,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:40:55,960 WARN L261 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 205 conjunts are in the unsatisfiable core [2021-11-13 02:40:55,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:41:00,188 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 13 proven. 416 refuted. 0 times theorem prover too weak. 461 trivial. 0 not checked. [2021-11-13 02:41:00,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:41:12,827 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 50 proven. 700 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-11-13 02:41:12,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [280690293] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:41:12,828 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1563433252] [2021-11-13 02:41:12,829 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:41:12,829 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:41:12,830 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:41:12,831 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:41:12,831 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 36, 54] total 127 [2021-11-13 02:41:12,831 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436544879] [2021-11-13 02:41:12,831 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:41:12,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2021-11-13 02:41:12,832 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:41:12,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2021-11-13 02:41:12,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=15567, Unknown=0, NotChecked=0, Total=16002 [2021-11-13 02:41:12,833 INFO L87 Difference]: Start difference. First operand 86 states and 117 transitions. Second operand has 127 states, 122 states have (on average 1.540983606557377) internal successors, (188), 79 states have internal predecessors, (188), 35 states have call successors, (35), 1 states have call predecessors, (35), 32 states have return successors, (49), 48 states have call predecessors, (49), 35 states have call successors, (49) [2021-11-13 02:41:19,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:41:19,470 INFO L93 Difference]: Finished difference Result 107 states and 149 transitions. [2021-11-13 02:41:19,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-13 02:41:19,470 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 122 states have (on average 1.540983606557377) internal successors, (188), 79 states have internal predecessors, (188), 35 states have call successors, (35), 1 states have call predecessors, (35), 32 states have return successors, (49), 48 states have call predecessors, (49), 35 states have call successors, (49) Word has length 124 [2021-11-13 02:41:19,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:41:19,471 INFO L225 Difference]: With dead ends: 107 [2021-11-13 02:41:19,472 INFO L226 Difference]: Without dead ends: 100 [2021-11-13 02:41:19,474 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 176 SyntacticMatches, 4 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5757 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=2167, Invalid=25555, Unknown=0, NotChecked=0, Total=27722 [2021-11-13 02:41:19,475 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 368 mSDsluCounter, 1380 mSDsCounter, 0 mSdLazyCounter, 4643 mSolverCounterSat, 683 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3131.44ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 370 SdHoareTripleChecker+Valid, 1329 SdHoareTripleChecker+Invalid, 5326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 20.55ms SdHoareTripleChecker+Time, 683 IncrementalHoareTripleChecker+Valid, 4643 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3553.59ms IncrementalHoareTripleChecker+Time [2021-11-13 02:41:19,475 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [370 Valid, 1329 Invalid, 5326 Unknown, 0 Unchecked, 20.55ms Time], IncrementalHoareTripleChecker [683 Valid, 4643 Invalid, 0 Unknown, 0 Unchecked, 3553.59ms Time] [2021-11-13 02:41:19,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-13 02:41:19,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 89. [2021-11-13 02:41:19,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 60 states have (on average 1.0666666666666667) internal successors, (64), 61 states have internal predecessors, (64), 8 states have call successors, (8), 4 states have call predecessors, (8), 20 states have return successors, (50), 23 states have call predecessors, (50), 8 states have call successors, (50) [2021-11-13 02:41:19,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 122 transitions. [2021-11-13 02:41:19,489 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 122 transitions. Word has length 124 [2021-11-13 02:41:19,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:41:19,489 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 122 transitions. [2021-11-13 02:41:19,490 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 122 states have (on average 1.540983606557377) internal successors, (188), 79 states have internal predecessors, (188), 35 states have call successors, (35), 1 states have call predecessors, (35), 32 states have return successors, (49), 48 states have call predecessors, (49), 35 states have call successors, (49) [2021-11-13 02:41:19,490 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 122 transitions. [2021-11-13 02:41:19,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-13 02:41:19,491 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:41:19,491 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 18, 16, 16, 16, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:41:19,530 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-13 02:41:19,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-13 02:41:19,705 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:41:19,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:41:19,705 INFO L85 PathProgramCache]: Analyzing trace with hash 2065134234, now seen corresponding path program 26 times [2021-11-13 02:41:19,705 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:41:19,706 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507889608] [2021-11-13 02:41:19,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:41:19,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:41:19,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:41:23,139 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 0 proven. 848 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2021-11-13 02:41:23,140 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:41:23,140 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507889608] [2021-11-13 02:41:23,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507889608] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:41:23,140 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1462342329] [2021-11-13 02:41:23,140 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:41:23,140 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:41:23,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:41:23,141 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:41:23,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-13 02:41:23,462 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-13 02:41:23,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:41:23,468 WARN L261 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 217 conjunts are in the unsatisfiable core [2021-11-13 02:41:23,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:41:27,695 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 14 proven. 468 refuted. 0 times theorem prover too weak. 523 trivial. 0 not checked. [2021-11-13 02:41:27,696 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:41:40,976 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 53 proven. 795 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2021-11-13 02:41:40,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1462342329] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:41:40,976 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1044507513] [2021-11-13 02:41:40,977 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:41:40,977 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:41:40,978 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:41:40,979 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:41:40,979 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 38, 57] total 134 [2021-11-13 02:41:40,979 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882204339] [2021-11-13 02:41:40,979 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:41:40,981 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 134 states [2021-11-13 02:41:40,981 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:41:40,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2021-11-13 02:41:40,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=459, Invalid=17363, Unknown=0, NotChecked=0, Total=17822 [2021-11-13 02:41:40,983 INFO L87 Difference]: Start difference. First operand 89 states and 122 transitions. Second operand has 134 states, 129 states have (on average 1.5426356589147288) internal successors, (199), 83 states have internal predecessors, (199), 37 states have call successors, (37), 1 states have call predecessors, (37), 34 states have return successors, (52), 51 states have call predecessors, (52), 37 states have call successors, (52) [2021-11-13 02:41:47,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:41:47,086 INFO L93 Difference]: Finished difference Result 110 states and 154 transitions. [2021-11-13 02:41:47,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-13 02:41:47,086 INFO L78 Accepts]: Start accepts. Automaton has has 134 states, 129 states have (on average 1.5426356589147288) internal successors, (199), 83 states have internal predecessors, (199), 37 states have call successors, (37), 1 states have call predecessors, (37), 34 states have return successors, (52), 51 states have call predecessors, (52), 37 states have call successors, (52) Word has length 131 [2021-11-13 02:41:47,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:41:47,088 INFO L225 Difference]: With dead ends: 110 [2021-11-13 02:41:47,088 INFO L226 Difference]: Without dead ends: 103 [2021-11-13 02:41:47,101 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 186 SyntacticMatches, 4 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6400 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=2364, Invalid=28436, Unknown=0, NotChecked=0, Total=30800 [2021-11-13 02:41:47,101 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 339 mSDsluCounter, 1426 mSDsCounter, 0 mSdLazyCounter, 4977 mSolverCounterSat, 633 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2851.63ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 341 SdHoareTripleChecker+Valid, 1374 SdHoareTripleChecker+Invalid, 5610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 16.25ms SdHoareTripleChecker+Time, 633 IncrementalHoareTripleChecker+Valid, 4977 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3240.85ms IncrementalHoareTripleChecker+Time [2021-11-13 02:41:47,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [341 Valid, 1374 Invalid, 5610 Unknown, 0 Unchecked, 16.25ms Time], IncrementalHoareTripleChecker [633 Valid, 4977 Invalid, 0 Unknown, 0 Unchecked, 3240.85ms Time] [2021-11-13 02:41:47,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-13 02:41:47,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 92. [2021-11-13 02:41:47,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 62 states have (on average 1.064516129032258) internal successors, (66), 63 states have internal predecessors, (66), 8 states have call successors, (8), 4 states have call predecessors, (8), 21 states have return successors, (53), 24 states have call predecessors, (53), 8 states have call successors, (53) [2021-11-13 02:41:47,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 127 transitions. [2021-11-13 02:41:47,116 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 127 transitions. Word has length 131 [2021-11-13 02:41:47,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:41:47,117 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 127 transitions. [2021-11-13 02:41:47,117 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 134 states, 129 states have (on average 1.5426356589147288) internal successors, (199), 83 states have internal predecessors, (199), 37 states have call successors, (37), 1 states have call predecessors, (37), 34 states have return successors, (52), 51 states have call predecessors, (52), 37 states have call successors, (52) [2021-11-13 02:41:47,117 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 127 transitions. [2021-11-13 02:41:47,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-13 02:41:47,119 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:41:47,119 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 19, 17, 17, 17, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:41:47,155 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-11-13 02:41:47,341 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-13 02:41:47,341 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:41:47,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:41:47,341 INFO L85 PathProgramCache]: Analyzing trace with hash -1491843990, now seen corresponding path program 27 times [2021-11-13 02:41:47,341 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:41:47,342 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2066376958] [2021-11-13 02:41:47,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:41:47,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:41:47,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:41:50,263 INFO L134 CoverageAnalysis]: Checked inductivity of 1127 backedges. 0 proven. 952 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2021-11-13 02:41:50,264 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:41:50,264 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2066376958] [2021-11-13 02:41:50,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2066376958] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:41:50,264 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1796761876] [2021-11-13 02:41:50,264 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 02:41:50,264 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:41:50,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:41:50,265 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:41:50,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-13 02:41:50,570 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 02:41:50,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:41:50,574 WARN L261 TraceCheckSpWp]: Trace formula consists of 412 conjuncts, 229 conjunts are in the unsatisfiable core [2021-11-13 02:41:50,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:41:54,877 INFO L134 CoverageAnalysis]: Checked inductivity of 1127 backedges. 15 proven. 523 refuted. 0 times theorem prover too weak. 589 trivial. 0 not checked. [2021-11-13 02:41:54,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:42:08,701 INFO L134 CoverageAnalysis]: Checked inductivity of 1127 backedges. 56 proven. 896 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2021-11-13 02:42:08,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1796761876] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:42:08,701 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [767831132] [2021-11-13 02:42:08,703 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:42:08,703 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:42:08,703 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:42:08,704 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:42:08,704 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 40, 60] total 141 [2021-11-13 02:42:08,705 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122583885] [2021-11-13 02:42:08,705 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:42:08,709 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 141 states [2021-11-13 02:42:08,709 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:42:08,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 141 interpolants. [2021-11-13 02:42:08,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=483, Invalid=19257, Unknown=0, NotChecked=0, Total=19740 [2021-11-13 02:42:08,712 INFO L87 Difference]: Start difference. First operand 92 states and 127 transitions. Second operand has 141 states, 136 states have (on average 1.5441176470588236) internal successors, (210), 87 states have internal predecessors, (210), 39 states have call successors, (39), 1 states have call predecessors, (39), 36 states have return successors, (55), 54 states have call predecessors, (55), 39 states have call successors, (55) [2021-11-13 02:42:15,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:42:15,877 INFO L93 Difference]: Finished difference Result 113 states and 159 transitions. [2021-11-13 02:42:15,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-13 02:42:15,877 INFO L78 Accepts]: Start accepts. Automaton has has 141 states, 136 states have (on average 1.5441176470588236) internal successors, (210), 87 states have internal predecessors, (210), 39 states have call successors, (39), 1 states have call predecessors, (39), 36 states have return successors, (55), 54 states have call predecessors, (55), 39 states have call successors, (55) Word has length 138 [2021-11-13 02:42:15,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:42:15,878 INFO L225 Difference]: With dead ends: 113 [2021-11-13 02:42:15,878 INFO L226 Difference]: Without dead ends: 106 [2021-11-13 02:42:15,880 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 196 SyntacticMatches, 4 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7077 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=2569, Invalid=31471, Unknown=0, NotChecked=0, Total=34040 [2021-11-13 02:42:15,881 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 580 mSDsluCounter, 1619 mSDsCounter, 0 mSdLazyCounter, 5559 mSolverCounterSat, 1081 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3380.96ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 582 SdHoareTripleChecker+Valid, 1556 SdHoareTripleChecker+Invalid, 6640 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 19.46ms SdHoareTripleChecker+Time, 1081 IncrementalHoareTripleChecker+Valid, 5559 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3850.61ms IncrementalHoareTripleChecker+Time [2021-11-13 02:42:15,881 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [582 Valid, 1556 Invalid, 6640 Unknown, 0 Unchecked, 19.46ms Time], IncrementalHoareTripleChecker [1081 Valid, 5559 Invalid, 0 Unknown, 0 Unchecked, 3850.61ms Time] [2021-11-13 02:42:15,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-11-13 02:42:15,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 95. [2021-11-13 02:42:15,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 64 states have (on average 1.0625) internal successors, (68), 65 states have internal predecessors, (68), 8 states have call successors, (8), 4 states have call predecessors, (8), 22 states have return successors, (56), 25 states have call predecessors, (56), 8 states have call successors, (56) [2021-11-13 02:42:15,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 132 transitions. [2021-11-13 02:42:15,894 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 132 transitions. Word has length 138 [2021-11-13 02:42:15,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:42:15,895 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 132 transitions. [2021-11-13 02:42:15,895 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 141 states, 136 states have (on average 1.5441176470588236) internal successors, (210), 87 states have internal predecessors, (210), 39 states have call successors, (39), 1 states have call predecessors, (39), 36 states have return successors, (55), 54 states have call predecessors, (55), 39 states have call successors, (55) [2021-11-13 02:42:15,895 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 132 transitions. [2021-11-13 02:42:15,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-13 02:42:15,897 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:42:15,897 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 20, 18, 18, 18, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:42:15,933 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-13 02:42:16,110 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:42:16,110 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:42:16,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:42:16,111 INFO L85 PathProgramCache]: Analyzing trace with hash -1492671894, now seen corresponding path program 28 times [2021-11-13 02:42:16,111 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:42:16,111 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388651370] [2021-11-13 02:42:16,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:42:16,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:42:16,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:42:19,144 INFO L134 CoverageAnalysis]: Checked inductivity of 1256 backedges. 0 proven. 1062 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2021-11-13 02:42:19,145 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:42:19,145 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388651370] [2021-11-13 02:42:19,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [388651370] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:42:19,145 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090600451] [2021-11-13 02:42:19,145 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 02:42:19,145 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:42:19,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:42:19,146 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:42:19,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-13 02:42:19,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:42:19,478 WARN L261 TraceCheckSpWp]: Trace formula consists of 431 conjuncts, 241 conjunts are in the unsatisfiable core [2021-11-13 02:42:19,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:42:24,169 INFO L134 CoverageAnalysis]: Checked inductivity of 1256 backedges. 16 proven. 581 refuted. 0 times theorem prover too weak. 659 trivial. 0 not checked. [2021-11-13 02:42:24,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 02:42:40,134 INFO L134 CoverageAnalysis]: Checked inductivity of 1256 backedges. 59 proven. 1003 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2021-11-13 02:42:40,134 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1090600451] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 02:42:40,134 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [453894448] [2021-11-13 02:42:40,135 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-13 02:42:40,135 INFO L166 IcfgInterpreter]: Building call graph [2021-11-13 02:42:40,135 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) 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) [2021-11-13 02:42:40,136 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 02:42:40,136 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 42, 63] total 148 [2021-11-13 02:42:40,137 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993199055] [2021-11-13 02:42:40,137 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 02:42:40,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 148 states [2021-11-13 02:42:40,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-13 02:42:40,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2021-11-13 02:42:40,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=507, Invalid=21249, Unknown=0, NotChecked=0, Total=21756 [2021-11-13 02:42:40,141 INFO L87 Difference]: Start difference. First operand 95 states and 132 transitions. Second operand has 148 states, 143 states have (on average 1.5454545454545454) internal successors, (221), 91 states have internal predecessors, (221), 41 states have call successors, (41), 1 states have call predecessors, (41), 38 states have return successors, (58), 57 states have call predecessors, (58), 41 states have call successors, (58) [2021-11-13 02:42:48,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 02:42:48,163 INFO L93 Difference]: Finished difference Result 116 states and 164 transitions. [2021-11-13 02:42:48,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-13 02:42:48,163 INFO L78 Accepts]: Start accepts. Automaton has has 148 states, 143 states have (on average 1.5454545454545454) internal successors, (221), 91 states have internal predecessors, (221), 41 states have call successors, (41), 1 states have call predecessors, (41), 38 states have return successors, (58), 57 states have call predecessors, (58), 41 states have call successors, (58) Word has length 145 [2021-11-13 02:42:48,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 02:42:48,165 INFO L225 Difference]: With dead ends: 116 [2021-11-13 02:42:48,165 INFO L226 Difference]: Without dead ends: 109 [2021-11-13 02:42:48,167 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 206 SyntacticMatches, 4 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7788 ImplicationChecksByTransitivity, 15.9s TimeCoverageRelationStatistics Valid=2782, Invalid=34660, Unknown=0, NotChecked=0, Total=37442 [2021-11-13 02:42:48,168 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 742 mSDsluCounter, 1672 mSDsCounter, 0 mSdLazyCounter, 5925 mSolverCounterSat, 1437 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3959.85ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 745 SdHoareTripleChecker+Valid, 1606 SdHoareTripleChecker+Invalid, 7362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 24.12ms SdHoareTripleChecker+Time, 1437 IncrementalHoareTripleChecker+Valid, 5925 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4494.27ms IncrementalHoareTripleChecker+Time [2021-11-13 02:42:48,168 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [745 Valid, 1606 Invalid, 7362 Unknown, 0 Unchecked, 24.12ms Time], IncrementalHoareTripleChecker [1437 Valid, 5925 Invalid, 0 Unknown, 0 Unchecked, 4494.27ms Time] [2021-11-13 02:42:48,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-13 02:42:48,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 98. [2021-11-13 02:42:48,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 67 states have internal predecessors, (70), 8 states have call successors, (8), 4 states have call predecessors, (8), 23 states have return successors, (59), 26 states have call predecessors, (59), 8 states have call successors, (59) [2021-11-13 02:42:48,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 137 transitions. [2021-11-13 02:42:48,182 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 137 transitions. Word has length 145 [2021-11-13 02:42:48,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 02:42:48,183 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 137 transitions. [2021-11-13 02:42:48,183 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 148 states, 143 states have (on average 1.5454545454545454) internal successors, (221), 91 states have internal predecessors, (221), 41 states have call successors, (41), 1 states have call predecessors, (41), 38 states have return successors, (58), 57 states have call predecessors, (58), 41 states have call successors, (58) [2021-11-13 02:42:48,184 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 137 transitions. [2021-11-13 02:42:48,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-13 02:42:48,185 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 02:42:48,185 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 21, 19, 19, 19, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 02:42:48,227 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-13 02:42:48,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:42:48,401 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-13 02:42:48,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 02:42:48,401 INFO L85 PathProgramCache]: Analyzing trace with hash 1062836378, now seen corresponding path program 29 times [2021-11-13 02:42:48,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-13 02:42:48,402 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825940772] [2021-11-13 02:42:48,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 02:42:48,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 02:42:48,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 02:42:52,070 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 0 proven. 1178 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2021-11-13 02:42:52,070 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-13 02:42:52,070 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825940772] [2021-11-13 02:42:52,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1825940772] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 02:42:52,071 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [724081134] [2021-11-13 02:42:52,071 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 02:42:52,071 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 02:42:52,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 [2021-11-13 02:42:52,071 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 02:42:52,072 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_23ba4513-9e89-4ede-a288-4cd6c0d06b21/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-13 02:42:52,467 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2021-11-13 02:42:52,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 02:42:52,476 WARN L261 TraceCheckSpWp]: Trace formula consists of 450 conjuncts, 252 conjunts are in the unsatisfiable core [2021-11-13 02:42:52,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 02:42:58,622 INFO L883 QuantifierPusher]: Run 10 iterations of DualJunctionQuantifierElimination maybe there is a nontermination bug. [2021-11-13 02:42:58,648 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 40 proven. 659 refuted. 0 times theorem prover too weak. 693 trivial. 0 not checked. [2021-11-13 02:42:58,649 INFO L328 TraceCheckSpWp]: Computing backward predicates...