/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml --cacsl2boogietranslator.check.unreachability.of.reach_error.function false --cacsl2boogietranslator.pointer.base.address.is.valid.at.dereference ASSERTandASSUME --cacsl2boogietranslator.pointer.to.allocated.memory.at.dereference ASSERTandASSUME --cacsl2boogietranslator.check.array.bounds.for.arrays.that.are.off.heap ASSERTandASSUME --cacsl2boogietranslator.check.if.freed.pointer.was.valid true --cacsl2boogietranslator.adapt.memory.model.on.pointer.casts.if.necessary true -i ../../../trunk/examples/svcomp/goblint-regression/28-race_reach_27-funptr_racing.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 12:37:59,540 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 12:37:59,597 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf [2023-08-26 12:37:59,604 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 12:37:59,604 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 12:37:59,632 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 12:37:59,633 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 12:37:59,633 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 12:37:59,633 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 12:37:59,636 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 12:37:59,636 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 12:37:59,636 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 12:37:59,637 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 12:37:59,637 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 12:37:59,638 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 12:37:59,638 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 12:37:59,638 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 12:37:59,638 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 12:37:59,638 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 12:37:59,638 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 12:37:59,638 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 12:37:59,639 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 12:37:59,639 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 12:37:59,640 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 12:37:59,640 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 12:37:59,640 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 12:37:59,640 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 12:37:59,640 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 12:37:59,640 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 12:37:59,640 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 12:37:59,641 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 12:37:59,641 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 12:37:59,641 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 12:37:59,641 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 12:37:59,642 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 12:37:59,642 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 12:37:59,911 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 12:37:59,924 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 12:37:59,926 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 12:37:59,927 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 12:37:59,927 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 12:37:59,928 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_27-funptr_racing.i [2023-08-26 12:38:00,962 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 12:38:01,190 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 12:38:01,191 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_27-funptr_racing.i [2023-08-26 12:38:01,204 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fe240f681/551bec4bc4e34a6fa2c96d2df271cb55/FLAGceb252faf [2023-08-26 12:38:01,217 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fe240f681/551bec4bc4e34a6fa2c96d2df271cb55 [2023-08-26 12:38:01,220 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 12:38:01,220 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 12:38:01,221 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 12:38:01,221 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 12:38:01,223 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 12:38:01,223 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 12:38:01" (1/1) ... [2023-08-26 12:38:01,224 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a843f8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:01, skipping insertion in model container [2023-08-26 12:38:01,224 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 12:38:01" (1/1) ... [2023-08-26 12:38:01,261 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 12:38:01,581 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 12:38:01,597 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 12:38:01,617 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 12:38:01,619 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 12:38:01,623 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: unsigned short [736] [2023-08-26 12:38:01,644 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 12:38:01,693 WARN L669 CHandler]: The function g is called, but not defined or handled by StandardFunctionHandler. [2023-08-26 12:38:01,697 INFO L206 MainTranslator]: Completed translation [2023-08-26 12:38:01,698 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:01 WrapperNode [2023-08-26 12:38:01,698 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 12:38:01,699 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 12:38:01,699 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 12:38:01,699 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 12:38:01,703 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:01" (1/1) ... [2023-08-26 12:38:01,727 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:01" (1/1) ... [2023-08-26 12:38:01,751 INFO L138 Inliner]: procedures = 273, calls = 44, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 153 [2023-08-26 12:38:01,751 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 12:38:01,752 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 12:38:01,752 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 12:38:01,752 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 12:38:01,758 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:01" (1/1) ... [2023-08-26 12:38:01,758 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:01" (1/1) ... [2023-08-26 12:38:01,771 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:01" (1/1) ... [2023-08-26 12:38:01,771 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:01" (1/1) ... [2023-08-26 12:38:01,775 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:01" (1/1) ... [2023-08-26 12:38:01,778 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:01" (1/1) ... [2023-08-26 12:38:01,779 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:01" (1/1) ... [2023-08-26 12:38:01,780 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:01" (1/1) ... [2023-08-26 12:38:01,781 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 12:38:01,782 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 12:38:01,782 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 12:38:01,782 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 12:38:01,783 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:01" (1/1) ... [2023-08-26 12:38:01,796 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 12:38:01,803 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:38:01,811 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-08-26 12:38:01,829 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-08-26 12:38:01,837 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 12:38:01,837 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 12:38:01,837 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 12:38:01,837 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 12:38:01,837 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-26 12:38:01,837 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 12:38:01,838 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-26 12:38:01,838 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-26 12:38:01,838 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 12:38:01,838 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 12:38:01,838 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 12:38:01,839 WARN L210 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to OneNontrivialStatement [2023-08-26 12:38:01,968 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 12:38:01,973 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 12:38:02,237 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 12:38:02,242 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 12:38:02,243 INFO L302 CfgBuilder]: Removed 16 assume(true) statements. [2023-08-26 12:38:02,244 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 12:38:02 BoogieIcfgContainer [2023-08-26 12:38:02,244 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 12:38:02,246 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 12:38:02,246 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 12:38:02,248 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 12:38:02,248 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 12:38:01" (1/3) ... [2023-08-26 12:38:02,248 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d4cab36 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 12:38:02, skipping insertion in model container [2023-08-26 12:38:02,249 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:01" (2/3) ... [2023-08-26 12:38:02,249 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d4cab36 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 12:38:02, skipping insertion in model container [2023-08-26 12:38:02,249 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 12:38:02" (3/3) ... [2023-08-26 12:38:02,250 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_27-funptr_racing.i [2023-08-26 12:38:02,263 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 12:38:02,263 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2023-08-26 12:38:02,263 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 12:38:02,314 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-26 12:38:02,338 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 138 places, 155 transitions, 318 flow [2023-08-26 12:38:02,380 INFO L124 PetriNetUnfolderBase]: 26/202 cut-off events. [2023-08-26 12:38:02,380 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 12:38:02,384 INFO L83 FinitePrefix]: Finished finitePrefix Result has 208 conditions, 202 events. 26/202 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 592 event pairs, 0 based on Foata normal form. 0/163 useless extension candidates. Maximal degree in co-relation 114. Up to 4 conditions per place. [2023-08-26 12:38:02,385 INFO L82 GeneralOperation]: Start removeDead. Operand has 138 places, 155 transitions, 318 flow [2023-08-26 12:38:02,388 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 138 places, 155 transitions, 318 flow [2023-08-26 12:38:02,390 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 12:38:02,396 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 138 places, 155 transitions, 318 flow [2023-08-26 12:38:02,398 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 138 places, 155 transitions, 318 flow [2023-08-26 12:38:02,398 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 138 places, 155 transitions, 318 flow [2023-08-26 12:38:02,424 INFO L124 PetriNetUnfolderBase]: 26/202 cut-off events. [2023-08-26 12:38:02,424 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 12:38:02,425 INFO L83 FinitePrefix]: Finished finitePrefix Result has 208 conditions, 202 events. 26/202 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 592 event pairs, 0 based on Foata normal form. 0/163 useless extension candidates. Maximal degree in co-relation 114. Up to 4 conditions per place. [2023-08-26 12:38:02,428 INFO L119 LiptonReduction]: Number of co-enabled transitions 6572 [2023-08-26 12:38:04,899 INFO L134 LiptonReduction]: Checked pairs total: 13038 [2023-08-26 12:38:04,902 INFO L136 LiptonReduction]: Total number of compositions: 127 [2023-08-26 12:38:04,938 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 12:38:04,943 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@64422640, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 12:38:04,943 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-08-26 12:38:04,945 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 12:38:04,946 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 12:38:04,946 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:38:04,946 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:04,946 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:38:04,947 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:38:04,950 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:04,950 INFO L85 PathProgramCache]: Analyzing trace with hash 19619, now seen corresponding path program 1 times [2023-08-26 12:38:04,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:04,957 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [621819989] [2023-08-26 12:38:04,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:04,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:05,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:05,181 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:05,181 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:05,181 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [621819989] [2023-08-26 12:38:05,181 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [621819989] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:38:05,182 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:38:05,182 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:38:05,183 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836460714] [2023-08-26 12:38:05,183 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:38:05,188 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:38:05,191 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:05,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:38:05,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:38:05,215 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 113 out of 282 [2023-08-26 12:38:05,216 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 44 places, 57 transitions, 122 flow. Second operand has 3 states, 3 states have (on average 113.66666666666667) internal successors, (341), 3 states have internal predecessors, (341), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:05,216 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:05,216 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 113 of 282 [2023-08-26 12:38:05,217 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:05,350 INFO L124 PetriNetUnfolderBase]: 256/577 cut-off events. [2023-08-26 12:38:05,351 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 12:38:05,353 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1132 conditions, 577 events. 256/577 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 37. Compared 3081 event pairs, 70 based on Foata normal form. 32/470 useless extension candidates. Maximal degree in co-relation 1082. Up to 517 conditions per place. [2023-08-26 12:38:05,357 INFO L140 encePairwiseOnDemand]: 264/282 looper letters, 52 selfloop transitions, 2 changer transitions 1/62 dead transitions. [2023-08-26 12:38:05,357 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 46 places, 62 transitions, 242 flow [2023-08-26 12:38:05,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:38:05,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:38:05,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 422 transitions. [2023-08-26 12:38:05,371 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4988179669030733 [2023-08-26 12:38:05,371 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 422 transitions. [2023-08-26 12:38:05,372 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 422 transitions. [2023-08-26 12:38:05,373 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:05,374 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 422 transitions. [2023-08-26 12:38:05,377 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 140.66666666666666) internal successors, (422), 3 states have internal predecessors, (422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:05,380 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 282.0) internal successors, (1128), 4 states have internal predecessors, (1128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:05,380 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 282.0) internal successors, (1128), 4 states have internal predecessors, (1128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:05,381 INFO L175 Difference]: Start difference. First operand has 44 places, 57 transitions, 122 flow. Second operand 3 states and 422 transitions. [2023-08-26 12:38:05,382 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 46 places, 62 transitions, 242 flow [2023-08-26 12:38:05,384 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 46 places, 62 transitions, 242 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 12:38:05,386 INFO L231 Difference]: Finished difference. Result has 47 places, 42 transitions, 102 flow [2023-08-26 12:38:05,387 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=282, PETRI_DIFFERENCE_MINUEND_FLOW=94, PETRI_DIFFERENCE_MINUEND_PLACES=44, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=43, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=41, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=102, PETRI_PLACES=47, PETRI_TRANSITIONS=42} [2023-08-26 12:38:05,389 INFO L281 CegarLoopForPetriNet]: 44 programPoint places, 3 predicate places. [2023-08-26 12:38:05,389 INFO L495 AbstractCegarLoop]: Abstraction has has 47 places, 42 transitions, 102 flow [2023-08-26 12:38:05,390 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 113.66666666666667) internal successors, (341), 3 states have internal predecessors, (341), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:05,390 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:05,390 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:38:05,390 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 12:38:05,390 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:38:05,391 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:05,391 INFO L85 PathProgramCache]: Analyzing trace with hash 19617, now seen corresponding path program 1 times [2023-08-26 12:38:05,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:05,391 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1780984888] [2023-08-26 12:38:05,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:05,391 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:05,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:05,427 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:05,427 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:05,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1780984888] [2023-08-26 12:38:05,428 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1780984888] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:38:05,428 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:38:05,428 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:38:05,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660664186] [2023-08-26 12:38:05,428 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:38:05,429 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:38:05,429 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:05,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:38:05,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:38:05,430 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 118 out of 282 [2023-08-26 12:38:05,431 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 47 places, 42 transitions, 102 flow. Second operand has 3 states, 3 states have (on average 118.66666666666667) internal successors, (356), 3 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:05,431 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:05,431 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 118 of 282 [2023-08-26 12:38:05,431 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:05,490 INFO L124 PetriNetUnfolderBase]: 205/459 cut-off events. [2023-08-26 12:38:05,491 INFO L125 PetriNetUnfolderBase]: For 28/28 co-relation queries the response was YES. [2023-08-26 12:38:05,491 INFO L83 FinitePrefix]: Finished finitePrefix Result has 974 conditions, 459 events. 205/459 cut-off events. For 28/28 co-relation queries the response was YES. Maximal size of possible extension queue 30. Compared 2142 event pairs, 192 based on Foata normal form. 0/389 useless extension candidates. Maximal degree in co-relation 939. Up to 432 conditions per place. [2023-08-26 12:38:05,493 INFO L140 encePairwiseOnDemand]: 279/282 looper letters, 32 selfloop transitions, 1 changer transitions 0/40 dead transitions. [2023-08-26 12:38:05,493 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 46 places, 40 transitions, 164 flow [2023-08-26 12:38:05,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:38:05,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:38:05,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 389 transitions. [2023-08-26 12:38:05,495 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4598108747044917 [2023-08-26 12:38:05,495 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 389 transitions. [2023-08-26 12:38:05,496 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 389 transitions. [2023-08-26 12:38:05,497 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:05,497 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 389 transitions. [2023-08-26 12:38:05,498 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 129.66666666666666) internal successors, (389), 3 states have internal predecessors, (389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:05,501 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 282.0) internal successors, (1128), 4 states have internal predecessors, (1128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:05,501 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 282.0) internal successors, (1128), 4 states have internal predecessors, (1128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:05,501 INFO L175 Difference]: Start difference. First operand has 47 places, 42 transitions, 102 flow. Second operand 3 states and 389 transitions. [2023-08-26 12:38:05,501 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 46 places, 40 transitions, 164 flow [2023-08-26 12:38:05,503 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 44 places, 40 transitions, 160 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 12:38:05,504 INFO L231 Difference]: Finished difference. Result has 44 places, 40 transitions, 96 flow [2023-08-26 12:38:05,504 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=282, PETRI_DIFFERENCE_MINUEND_FLOW=94, PETRI_DIFFERENCE_MINUEND_PLACES=42, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=40, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=39, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=96, PETRI_PLACES=44, PETRI_TRANSITIONS=40} [2023-08-26 12:38:05,504 INFO L281 CegarLoopForPetriNet]: 44 programPoint places, 0 predicate places. [2023-08-26 12:38:05,505 INFO L495 AbstractCegarLoop]: Abstraction has has 44 places, 40 transitions, 96 flow [2023-08-26 12:38:05,506 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 118.66666666666667) internal successors, (356), 3 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:05,508 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:05,508 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 12:38:05,508 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-26 12:38:05,509 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:38:05,510 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:05,510 INFO L85 PathProgramCache]: Analyzing trace with hash 584896030, now seen corresponding path program 1 times [2023-08-26 12:38:05,510 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:05,513 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [405834205] [2023-08-26 12:38:05,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:05,514 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:05,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:05,633 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:05,633 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:05,634 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [405834205] [2023-08-26 12:38:05,634 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [405834205] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 12:38:05,634 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1327629240] [2023-08-26 12:38:05,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:05,634 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:38:05,634 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:38:05,652 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 12:38:05,680 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-08-26 12:38:05,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:05,738 INFO L262 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 12:38:05,741 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 12:38:05,791 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 12:38:05,822 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:05,822 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 12:38:05,858 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:05,858 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1327629240] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 12:38:05,858 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 12:38:05,858 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 12:38:05,859 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556841221] [2023-08-26 12:38:05,859 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 12:38:05,859 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 12:38:05,859 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:05,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 12:38:05,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 12:38:05,861 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 113 out of 282 [2023-08-26 12:38:05,862 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 44 places, 40 transitions, 96 flow. Second operand has 8 states, 8 states have (on average 114.875) internal successors, (919), 8 states have internal predecessors, (919), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:05,862 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:05,862 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 113 of 282 [2023-08-26 12:38:05,862 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:05,943 INFO L124 PetriNetUnfolderBase]: 35/100 cut-off events. [2023-08-26 12:38:05,943 INFO L125 PetriNetUnfolderBase]: For 15/15 co-relation queries the response was YES. [2023-08-26 12:38:05,943 INFO L83 FinitePrefix]: Finished finitePrefix Result has 215 conditions, 100 events. 35/100 cut-off events. For 15/15 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 291 event pairs, 15 based on Foata normal form. 17/114 useless extension candidates. Maximal degree in co-relation 207. Up to 68 conditions per place. [2023-08-26 12:38:05,944 INFO L140 encePairwiseOnDemand]: 278/282 looper letters, 37 selfloop transitions, 2 changer transitions 0/44 dead transitions. [2023-08-26 12:38:05,944 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 34 places, 44 transitions, 175 flow [2023-08-26 12:38:05,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 12:38:05,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 12:38:05,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 493 transitions. [2023-08-26 12:38:05,946 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4370567375886525 [2023-08-26 12:38:05,946 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 493 transitions. [2023-08-26 12:38:05,946 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 493 transitions. [2023-08-26 12:38:05,946 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:05,946 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 493 transitions. [2023-08-26 12:38:05,947 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 123.25) internal successors, (493), 4 states have internal predecessors, (493), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:05,949 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 282.0) internal successors, (1410), 5 states have internal predecessors, (1410), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:05,949 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 282.0) internal successors, (1410), 5 states have internal predecessors, (1410), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:05,949 INFO L175 Difference]: Start difference. First operand has 44 places, 40 transitions, 96 flow. Second operand 4 states and 493 transitions. [2023-08-26 12:38:05,950 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 34 places, 44 transitions, 175 flow [2023-08-26 12:38:05,950 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 32 places, 44 transitions, 172 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 12:38:05,951 INFO L231 Difference]: Finished difference. Result has 32 places, 26 transitions, 62 flow [2023-08-26 12:38:05,951 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=282, PETRI_DIFFERENCE_MINUEND_FLOW=58, PETRI_DIFFERENCE_MINUEND_PLACES=29, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=26, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=24, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=62, PETRI_PLACES=32, PETRI_TRANSITIONS=26} [2023-08-26 12:38:05,951 INFO L281 CegarLoopForPetriNet]: 44 programPoint places, -12 predicate places. [2023-08-26 12:38:05,952 INFO L495 AbstractCegarLoop]: Abstraction has has 32 places, 26 transitions, 62 flow [2023-08-26 12:38:05,952 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 114.875) internal successors, (919), 8 states have internal predecessors, (919), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:05,952 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:05,952 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-26 12:38:05,973 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-08-26 12:38:06,158 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:38:06,158 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:38:06,159 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:06,160 INFO L85 PathProgramCache]: Analyzing trace with hash 951908170, now seen corresponding path program 1 times [2023-08-26 12:38:06,160 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:06,160 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [666115935] [2023-08-26 12:38:06,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:06,160 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:06,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:38:06,181 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 12:38:06,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:38:06,210 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 12:38:06,210 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 12:38:06,211 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (5 of 6 remaining) [2023-08-26 12:38:06,212 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 6 remaining) [2023-08-26 12:38:06,213 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 6 remaining) [2023-08-26 12:38:06,213 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 6 remaining) [2023-08-26 12:38:06,213 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 6 remaining) [2023-08-26 12:38:06,213 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (0 of 6 remaining) [2023-08-26 12:38:06,213 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 12:38:06,214 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 12:38:06,215 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 12:38:06,215 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 12:38:06,249 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-26 12:38:06,257 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 190 places, 219 transitions, 456 flow [2023-08-26 12:38:06,317 INFO L124 PetriNetUnfolderBase]: 48/340 cut-off events. [2023-08-26 12:38:06,318 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 12:38:06,319 INFO L83 FinitePrefix]: Finished finitePrefix Result has 354 conditions, 340 events. 48/340 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1239 event pairs, 0 based on Foata normal form. 0/271 useless extension candidates. Maximal degree in co-relation 204. Up to 8 conditions per place. [2023-08-26 12:38:06,319 INFO L82 GeneralOperation]: Start removeDead. Operand has 190 places, 219 transitions, 456 flow [2023-08-26 12:38:06,321 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 190 places, 219 transitions, 456 flow [2023-08-26 12:38:06,321 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 12:38:06,321 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 190 places, 219 transitions, 456 flow [2023-08-26 12:38:06,322 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 190 places, 219 transitions, 456 flow [2023-08-26 12:38:06,322 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 190 places, 219 transitions, 456 flow [2023-08-26 12:38:06,348 INFO L124 PetriNetUnfolderBase]: 48/340 cut-off events. [2023-08-26 12:38:06,348 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 12:38:06,350 INFO L83 FinitePrefix]: Finished finitePrefix Result has 354 conditions, 340 events. 48/340 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1239 event pairs, 0 based on Foata normal form. 0/271 useless extension candidates. Maximal degree in co-relation 204. Up to 8 conditions per place. [2023-08-26 12:38:06,360 INFO L119 LiptonReduction]: Number of co-enabled transitions 22196 [2023-08-26 12:38:09,247 INFO L134 LiptonReduction]: Checked pairs total: 60970 [2023-08-26 12:38:09,248 INFO L136 LiptonReduction]: Total number of compositions: 154 [2023-08-26 12:38:09,265 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 12:38:09,270 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@64422640, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 12:38:09,270 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-08-26 12:38:09,271 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 12:38:09,272 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 12:38:09,272 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:38:09,272 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:09,272 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:38:09,272 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:38:09,272 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:09,272 INFO L85 PathProgramCache]: Analyzing trace with hash 33604, now seen corresponding path program 1 times [2023-08-26 12:38:09,272 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:09,272 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1713522227] [2023-08-26 12:38:09,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:09,273 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:09,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:09,311 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:09,312 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:09,313 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1713522227] [2023-08-26 12:38:09,313 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1713522227] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:38:09,313 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:38:09,313 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:38:09,313 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313542455] [2023-08-26 12:38:09,313 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:38:09,314 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:38:09,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:09,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:38:09,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:38:09,314 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 168 out of 373 [2023-08-26 12:38:09,315 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 79 places, 106 transitions, 230 flow. Second operand has 3 states, 3 states have (on average 168.66666666666666) internal successors, (506), 3 states have internal predecessors, (506), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:09,315 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:09,315 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 168 of 373 [2023-08-26 12:38:09,315 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:10,421 INFO L124 PetriNetUnfolderBase]: 10334/17358 cut-off events. [2023-08-26 12:38:10,422 INFO L125 PetriNetUnfolderBase]: For 109/109 co-relation queries the response was YES. [2023-08-26 12:38:10,433 INFO L83 FinitePrefix]: Finished finitePrefix Result has 33347 conditions, 17358 events. 10334/17358 cut-off events. For 109/109 co-relation queries the response was YES. Maximal size of possible extension queue 550. Compared 128323 event pairs, 9055 based on Foata normal form. 2376/16746 useless extension candidates. Maximal degree in co-relation 13325. Up to 14772 conditions per place. [2023-08-26 12:38:10,479 INFO L140 encePairwiseOnDemand]: 341/373 looper letters, 54 selfloop transitions, 1 changer transitions 39/112 dead transitions. [2023-08-26 12:38:10,479 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 112 transitions, 430 flow [2023-08-26 12:38:10,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:38:10,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:38:10,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 652 transitions. [2023-08-26 12:38:10,481 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.58266309204647 [2023-08-26 12:38:10,481 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 652 transitions. [2023-08-26 12:38:10,481 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 652 transitions. [2023-08-26 12:38:10,481 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:10,481 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 652 transitions. [2023-08-26 12:38:10,482 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 217.33333333333334) internal successors, (652), 3 states have internal predecessors, (652), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:10,484 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 373.0) internal successors, (1492), 4 states have internal predecessors, (1492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:10,484 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 373.0) internal successors, (1492), 4 states have internal predecessors, (1492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:10,485 INFO L175 Difference]: Start difference. First operand has 79 places, 106 transitions, 230 flow. Second operand 3 states and 652 transitions. [2023-08-26 12:38:10,485 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 112 transitions, 430 flow [2023-08-26 12:38:10,486 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 78 places, 112 transitions, 430 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 12:38:10,487 INFO L231 Difference]: Finished difference. Result has 78 places, 73 transitions, 166 flow [2023-08-26 12:38:10,487 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=373, PETRI_DIFFERENCE_MINUEND_FLOW=168, PETRI_DIFFERENCE_MINUEND_PLACES=76, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=75, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=74, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=166, PETRI_PLACES=78, PETRI_TRANSITIONS=73} [2023-08-26 12:38:10,487 INFO L281 CegarLoopForPetriNet]: 79 programPoint places, -1 predicate places. [2023-08-26 12:38:10,487 INFO L495 AbstractCegarLoop]: Abstraction has has 78 places, 73 transitions, 166 flow [2023-08-26 12:38:10,488 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 168.66666666666666) internal successors, (506), 3 states have internal predecessors, (506), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:10,488 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:10,488 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:38:10,488 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 12:38:10,488 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:38:10,488 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:10,488 INFO L85 PathProgramCache]: Analyzing trace with hash 33603, now seen corresponding path program 1 times [2023-08-26 12:38:10,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:10,489 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2094113260] [2023-08-26 12:38:10,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:10,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:10,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:10,533 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:10,533 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:10,533 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2094113260] [2023-08-26 12:38:10,533 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2094113260] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:38:10,533 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:38:10,533 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:38:10,534 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038785579] [2023-08-26 12:38:10,534 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:38:10,534 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:38:10,534 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:10,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:38:10,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:38:10,535 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 163 out of 373 [2023-08-26 12:38:10,535 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 78 places, 73 transitions, 166 flow. Second operand has 3 states, 3 states have (on average 163.66666666666666) internal successors, (491), 3 states have internal predecessors, (491), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:10,535 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:10,535 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 163 of 373 [2023-08-26 12:38:10,535 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:11,325 INFO L124 PetriNetUnfolderBase]: 8909/14865 cut-off events. [2023-08-26 12:38:11,326 INFO L125 PetriNetUnfolderBase]: For 91/91 co-relation queries the response was YES. [2023-08-26 12:38:11,338 INFO L83 FinitePrefix]: Finished finitePrefix Result has 28706 conditions, 14865 events. 8909/14865 cut-off events. For 91/91 co-relation queries the response was YES. Maximal size of possible extension queue 486. Compared 108621 event pairs, 3944 based on Foata normal form. 0/12713 useless extension candidates. Maximal degree in co-relation 28698. Up to 13678 conditions per place. [2023-08-26 12:38:11,368 INFO L140 encePairwiseOnDemand]: 369/373 looper letters, 74 selfloop transitions, 2 changer transitions 0/94 dead transitions. [2023-08-26 12:38:11,369 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 94 transitions, 360 flow [2023-08-26 12:38:11,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:38:11,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:38:11,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 567 transitions. [2023-08-26 12:38:11,370 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5067024128686327 [2023-08-26 12:38:11,370 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 567 transitions. [2023-08-26 12:38:11,370 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 567 transitions. [2023-08-26 12:38:11,371 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:11,371 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 567 transitions. [2023-08-26 12:38:11,372 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 189.0) internal successors, (567), 3 states have internal predecessors, (567), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:11,373 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 373.0) internal successors, (1492), 4 states have internal predecessors, (1492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:11,374 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 373.0) internal successors, (1492), 4 states have internal predecessors, (1492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:11,374 INFO L175 Difference]: Start difference. First operand has 78 places, 73 transitions, 166 flow. Second operand 3 states and 567 transitions. [2023-08-26 12:38:11,374 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 94 transitions, 360 flow [2023-08-26 12:38:11,375 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 77 places, 94 transitions, 359 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 12:38:11,376 INFO L231 Difference]: Finished difference. Result has 78 places, 74 transitions, 179 flow [2023-08-26 12:38:11,376 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=373, PETRI_DIFFERENCE_MINUEND_FLOW=165, PETRI_DIFFERENCE_MINUEND_PLACES=75, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=73, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=71, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=179, PETRI_PLACES=78, PETRI_TRANSITIONS=74} [2023-08-26 12:38:11,376 INFO L281 CegarLoopForPetriNet]: 79 programPoint places, -1 predicate places. [2023-08-26 12:38:11,376 INFO L495 AbstractCegarLoop]: Abstraction has has 78 places, 74 transitions, 179 flow [2023-08-26 12:38:11,377 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 163.66666666666666) internal successors, (491), 3 states have internal predecessors, (491), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:11,377 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:11,377 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 12:38:11,377 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 12:38:11,377 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:38:11,377 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:11,377 INFO L85 PathProgramCache]: Analyzing trace with hash 993847571, now seen corresponding path program 1 times [2023-08-26 12:38:11,377 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:11,378 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724479487] [2023-08-26 12:38:11,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:11,378 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:11,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:11,426 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:11,426 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:11,426 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724479487] [2023-08-26 12:38:11,426 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724479487] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 12:38:11,426 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1563149603] [2023-08-26 12:38:11,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:11,427 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:38:11,427 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:38:11,428 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 12:38:11,449 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-08-26 12:38:11,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:11,503 INFO L262 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 12:38:11,504 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 12:38:11,513 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 12:38:11,545 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:11,545 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 12:38:11,574 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:11,574 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1563149603] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 12:38:11,574 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 12:38:11,574 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 12:38:11,575 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991513579] [2023-08-26 12:38:11,575 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 12:38:11,575 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 12:38:11,575 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:11,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 12:38:11,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 12:38:11,576 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 163 out of 373 [2023-08-26 12:38:11,577 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 78 places, 74 transitions, 179 flow. Second operand has 8 states, 8 states have (on average 164.875) internal successors, (1319), 8 states have internal predecessors, (1319), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:11,577 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:11,578 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 163 of 373 [2023-08-26 12:38:11,578 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:11,860 INFO L124 PetriNetUnfolderBase]: 1768/3354 cut-off events. [2023-08-26 12:38:11,860 INFO L125 PetriNetUnfolderBase]: For 722/722 co-relation queries the response was YES. [2023-08-26 12:38:11,864 INFO L83 FinitePrefix]: Finished finitePrefix Result has 7338 conditions, 3354 events. 1768/3354 cut-off events. For 722/722 co-relation queries the response was YES. Maximal size of possible extension queue 147. Compared 22429 event pairs, 0 based on Foata normal form. 361/3601 useless extension candidates. Maximal degree in co-relation 7328. Up to 2052 conditions per place. [2023-08-26 12:38:11,871 INFO L140 encePairwiseOnDemand]: 369/373 looper letters, 98 selfloop transitions, 3 changer transitions 0/116 dead transitions. [2023-08-26 12:38:11,871 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 68 places, 116 transitions, 455 flow [2023-08-26 12:38:11,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 12:38:11,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 12:38:11,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 920 transitions. [2023-08-26 12:38:11,873 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4932975871313673 [2023-08-26 12:38:11,874 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 920 transitions. [2023-08-26 12:38:11,874 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 920 transitions. [2023-08-26 12:38:11,874 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:11,874 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 920 transitions. [2023-08-26 12:38:11,875 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 184.0) internal successors, (920), 5 states have internal predecessors, (920), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:11,877 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 373.0) internal successors, (2238), 6 states have internal predecessors, (2238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:11,878 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 373.0) internal successors, (2238), 6 states have internal predecessors, (2238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:11,878 INFO L175 Difference]: Start difference. First operand has 78 places, 74 transitions, 179 flow. Second operand 5 states and 920 transitions. [2023-08-26 12:38:11,878 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 68 places, 116 transitions, 455 flow [2023-08-26 12:38:11,880 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 67 places, 116 transitions, 451 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-08-26 12:38:11,881 INFO L231 Difference]: Finished difference. Result has 67 places, 58 transitions, 139 flow [2023-08-26 12:38:11,881 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=373, PETRI_DIFFERENCE_MINUEND_FLOW=133, PETRI_DIFFERENCE_MINUEND_PLACES=63, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=58, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=139, PETRI_PLACES=67, PETRI_TRANSITIONS=58} [2023-08-26 12:38:11,881 INFO L281 CegarLoopForPetriNet]: 79 programPoint places, -12 predicate places. [2023-08-26 12:38:11,881 INFO L495 AbstractCegarLoop]: Abstraction has has 67 places, 58 transitions, 139 flow [2023-08-26 12:38:11,882 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 164.875) internal successors, (1319), 8 states have internal predecessors, (1319), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:11,882 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:11,882 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-26 12:38:11,886 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-08-26 12:38:12,086 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-08-26 12:38:12,086 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:38:12,086 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:12,086 INFO L85 PathProgramCache]: Analyzing trace with hash 1394151486, now seen corresponding path program 1 times [2023-08-26 12:38:12,087 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:12,087 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1711652320] [2023-08-26 12:38:12,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:12,087 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:12,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:38:12,095 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 12:38:12,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:38:12,104 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 12:38:12,104 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 12:38:12,104 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (5 of 6 remaining) [2023-08-26 12:38:12,104 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 6 remaining) [2023-08-26 12:38:12,104 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 6 remaining) [2023-08-26 12:38:12,104 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 6 remaining) [2023-08-26 12:38:12,104 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 6 remaining) [2023-08-26 12:38:12,105 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (0 of 6 remaining) [2023-08-26 12:38:12,105 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-26 12:38:12,105 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 12:38:12,105 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 12:38:12,105 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 12:38:12,121 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-26 12:38:12,123 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 242 places, 283 transitions, 596 flow [2023-08-26 12:38:12,160 INFO L124 PetriNetUnfolderBase]: 75/515 cut-off events. [2023-08-26 12:38:12,161 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 12:38:12,163 INFO L83 FinitePrefix]: Finished finitePrefix Result has 543 conditions, 515 events. 75/515 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 2075 event pairs, 1 based on Foata normal form. 0/408 useless extension candidates. Maximal degree in co-relation 348. Up to 16 conditions per place. [2023-08-26 12:38:12,164 INFO L82 GeneralOperation]: Start removeDead. Operand has 242 places, 283 transitions, 596 flow [2023-08-26 12:38:12,166 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 242 places, 283 transitions, 596 flow [2023-08-26 12:38:12,166 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 12:38:12,166 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 242 places, 283 transitions, 596 flow [2023-08-26 12:38:12,166 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 242 places, 283 transitions, 596 flow [2023-08-26 12:38:12,166 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 242 places, 283 transitions, 596 flow [2023-08-26 12:38:12,218 INFO L124 PetriNetUnfolderBase]: 75/515 cut-off events. [2023-08-26 12:38:12,219 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 12:38:12,222 INFO L83 FinitePrefix]: Finished finitePrefix Result has 543 conditions, 515 events. 75/515 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 14. Compared 2075 event pairs, 1 based on Foata normal form. 0/408 useless extension candidates. Maximal degree in co-relation 348. Up to 16 conditions per place. [2023-08-26 12:38:12,239 INFO L119 LiptonReduction]: Number of co-enabled transitions 45384 [2023-08-26 12:38:15,240 INFO L134 LiptonReduction]: Checked pairs total: 149472 [2023-08-26 12:38:15,240 INFO L136 LiptonReduction]: Total number of compositions: 190 [2023-08-26 12:38:15,241 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 12:38:15,241 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@64422640, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 12:38:15,241 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-08-26 12:38:15,243 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 12:38:15,243 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 12:38:15,243 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:38:15,243 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:15,243 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:38:15,243 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:38:15,243 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:15,243 INFO L85 PathProgramCache]: Analyzing trace with hash 50783, now seen corresponding path program 1 times [2023-08-26 12:38:15,243 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:15,243 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2120909654] [2023-08-26 12:38:15,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:15,244 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:15,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:15,291 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:15,292 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:15,292 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2120909654] [2023-08-26 12:38:15,292 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2120909654] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:38:15,292 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:38:15,292 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:38:15,292 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256396251] [2023-08-26 12:38:15,292 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:38:15,292 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:38:15,293 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:15,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:38:15,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:38:15,293 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 218 out of 473 [2023-08-26 12:38:15,294 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 106 places, 145 transitions, 320 flow. Second operand has 3 states, 3 states have (on average 218.66666666666666) internal successors, (656), 3 states have internal predecessors, (656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:15,294 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:15,294 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 218 of 473 [2023-08-26 12:38:15,294 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:34,831 INFO L124 PetriNetUnfolderBase]: 231648/343504 cut-off events. [2023-08-26 12:38:34,833 INFO L125 PetriNetUnfolderBase]: For 3452/3452 co-relation queries the response was YES. [2023-08-26 12:38:35,260 INFO L83 FinitePrefix]: Finished finitePrefix Result has 659192 conditions, 343504 events. 231648/343504 cut-off events. For 3452/3452 co-relation queries the response was YES. Maximal size of possible extension queue 8979. Compared 3083861 event pairs, 201875 based on Foata normal form. 46905/339523 useless extension candidates. Maximal degree in co-relation 95067. Up to 290967 conditions per place. [2023-08-26 12:38:36,448 INFO L140 encePairwiseOnDemand]: 429/473 looper letters, 70 selfloop transitions, 1 changer transitions 53/153 dead transitions. [2023-08-26 12:38:36,449 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 105 places, 153 transitions, 584 flow [2023-08-26 12:38:36,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:38:36,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:38:36,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 856 transitions. [2023-08-26 12:38:36,465 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.6032417195207893 [2023-08-26 12:38:36,466 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 856 transitions. [2023-08-26 12:38:36,466 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 856 transitions. [2023-08-26 12:38:36,466 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:36,466 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 856 transitions. [2023-08-26 12:38:36,467 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 285.3333333333333) internal successors, (856), 3 states have internal predecessors, (856), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:36,469 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 473.0) internal successors, (1892), 4 states have internal predecessors, (1892), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:36,470 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 473.0) internal successors, (1892), 4 states have internal predecessors, (1892), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:36,471 INFO L175 Difference]: Start difference. First operand has 106 places, 145 transitions, 320 flow. Second operand 3 states and 856 transitions. [2023-08-26 12:38:36,471 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 105 places, 153 transitions, 584 flow [2023-08-26 12:38:36,474 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 105 places, 153 transitions, 584 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 12:38:36,476 INFO L231 Difference]: Finished difference. Result has 105 places, 100 transitions, 232 flow [2023-08-26 12:38:36,476 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=473, PETRI_DIFFERENCE_MINUEND_FLOW=234, PETRI_DIFFERENCE_MINUEND_PLACES=103, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=102, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=101, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=232, PETRI_PLACES=105, PETRI_TRANSITIONS=100} [2023-08-26 12:38:36,476 INFO L281 CegarLoopForPetriNet]: 106 programPoint places, -1 predicate places. [2023-08-26 12:38:36,477 INFO L495 AbstractCegarLoop]: Abstraction has has 105 places, 100 transitions, 232 flow [2023-08-26 12:38:36,477 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 218.66666666666666) internal successors, (656), 3 states have internal predecessors, (656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:36,477 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:36,477 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:38:36,477 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 12:38:36,477 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:38:36,477 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:36,477 INFO L85 PathProgramCache]: Analyzing trace with hash 50781, now seen corresponding path program 1 times [2023-08-26 12:38:36,477 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:36,478 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1894146133] [2023-08-26 12:38:36,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:36,478 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:36,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:36,510 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:36,511 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:36,511 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1894146133] [2023-08-26 12:38:36,511 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1894146133] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:38:36,511 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:38:36,511 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:38:36,511 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700801954] [2023-08-26 12:38:36,511 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:38:36,512 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:38:36,512 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:36,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:38:36,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:38:36,513 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 213 out of 473 [2023-08-26 12:38:36,513 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 105 places, 100 transitions, 232 flow. Second operand has 3 states, 3 states have (on average 213.66666666666666) internal successors, (641), 3 states have internal predecessors, (641), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:36,513 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:36,513 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 213 of 473 [2023-08-26 12:38:36,513 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:51,900 INFO L124 PetriNetUnfolderBase]: 199858/297734 cut-off events. [2023-08-26 12:38:51,900 INFO L125 PetriNetUnfolderBase]: For 3619/3619 co-relation queries the response was YES. [2023-08-26 12:38:52,289 INFO L83 FinitePrefix]: Finished finitePrefix Result has 570736 conditions, 297734 events. 199858/297734 cut-off events. For 3619/3619 co-relation queries the response was YES. Maximal size of possible extension queue 7798. Compared 2650264 event pairs, 121992 based on Foata normal form. 0/260486 useless extension candidates. Maximal degree in co-relation 570727. Up to 270400 conditions per place. [2023-08-26 12:38:53,152 INFO L140 encePairwiseOnDemand]: 469/473 looper letters, 89 selfloop transitions, 2 changer transitions 0/120 dead transitions. [2023-08-26 12:38:53,152 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 105 places, 120 transitions, 454 flow [2023-08-26 12:38:53,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:38:53,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:38:53,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 732 transitions. [2023-08-26 12:38:53,154 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5158562367864693 [2023-08-26 12:38:53,154 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 732 transitions. [2023-08-26 12:38:53,154 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 732 transitions. [2023-08-26 12:38:53,155 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:53,155 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 732 transitions. [2023-08-26 12:38:53,156 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 244.0) internal successors, (732), 3 states have internal predecessors, (732), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:53,157 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 473.0) internal successors, (1892), 4 states have internal predecessors, (1892), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:53,158 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 473.0) internal successors, (1892), 4 states have internal predecessors, (1892), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:53,158 INFO L175 Difference]: Start difference. First operand has 105 places, 100 transitions, 232 flow. Second operand 3 states and 732 transitions. [2023-08-26 12:38:53,158 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 105 places, 120 transitions, 454 flow [2023-08-26 12:38:53,160 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 104 places, 120 transitions, 453 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 12:38:53,161 INFO L231 Difference]: Finished difference. Result has 105 places, 101 transitions, 245 flow [2023-08-26 12:38:53,161 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=473, PETRI_DIFFERENCE_MINUEND_FLOW=231, PETRI_DIFFERENCE_MINUEND_PLACES=102, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=100, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=98, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=245, PETRI_PLACES=105, PETRI_TRANSITIONS=101} [2023-08-26 12:38:53,163 INFO L281 CegarLoopForPetriNet]: 106 programPoint places, -1 predicate places. [2023-08-26 12:38:53,163 INFO L495 AbstractCegarLoop]: Abstraction has has 105 places, 101 transitions, 245 flow [2023-08-26 12:38:53,164 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 213.66666666666666) internal successors, (641), 3 states have internal predecessors, (641), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:53,164 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:53,164 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 12:38:53,164 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-26 12:38:53,164 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:38:53,164 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:53,164 INFO L85 PathProgramCache]: Analyzing trace with hash -304628144, now seen corresponding path program 1 times [2023-08-26 12:38:53,164 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:53,164 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [568607071] [2023-08-26 12:38:53,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:53,164 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:53,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:53,230 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:53,230 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:53,230 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [568607071] [2023-08-26 12:38:53,230 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [568607071] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 12:38:53,230 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842065830] [2023-08-26 12:38:53,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:53,230 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:38:53,230 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:38:53,231 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 12:38:53,253 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-08-26 12:38:53,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:53,312 INFO L262 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 12:38:53,313 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 12:38:53,322 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-08-26 12:38:53,348 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:53,348 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 12:38:53,376 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:38:53,376 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842065830] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 12:38:53,376 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 12:38:53,376 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 5 [2023-08-26 12:38:53,376 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48909077] [2023-08-26 12:38:53,377 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 12:38:53,377 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 12:38:53,377 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:53,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 12:38:53,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2023-08-26 12:38:53,379 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 213 out of 473 [2023-08-26 12:38:53,380 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 105 places, 101 transitions, 245 flow. Second operand has 7 states, 7 states have (on average 214.71428571428572) internal successors, (1503), 7 states have internal predecessors, (1503), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:38:53,380 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:53,380 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 213 of 473 [2023-08-26 12:38:53,380 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:39:07,277 INFO L124 PetriNetUnfolderBase]: 184414/267908 cut-off events. [2023-08-26 12:39:07,278 INFO L125 PetriNetUnfolderBase]: For 17405/17405 co-relation queries the response was YES. [2023-08-26 12:39:07,685 INFO L83 FinitePrefix]: Finished finitePrefix Result has 537168 conditions, 267908 events. 184414/267908 cut-off events. For 17405/17405 co-relation queries the response was YES. Maximal size of possible extension queue 6938. Compared 2325868 event pairs, 4607 based on Foata normal form. 18/245689 useless extension candidates. Maximal degree in co-relation 537157. Up to 192928 conditions per place. [2023-08-26 12:39:08,476 INFO L140 encePairwiseOnDemand]: 469/473 looper letters, 225 selfloop transitions, 6 changer transitions 0/260 dead transitions. [2023-08-26 12:39:08,476 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 109 places, 260 transitions, 1027 flow [2023-08-26 12:39:08,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 12:39:08,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 12:39:08,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1513 transitions. [2023-08-26 12:39:08,479 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.533121916842847 [2023-08-26 12:39:08,479 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1513 transitions. [2023-08-26 12:39:08,479 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1513 transitions. [2023-08-26 12:39:08,480 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:39:08,480 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1513 transitions. [2023-08-26 12:39:08,482 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 252.16666666666666) internal successors, (1513), 6 states have internal predecessors, (1513), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:39:08,485 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 473.0) internal successors, (3311), 7 states have internal predecessors, (3311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:39:08,485 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 473.0) internal successors, (3311), 7 states have internal predecessors, (3311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:39:08,485 INFO L175 Difference]: Start difference. First operand has 105 places, 101 transitions, 245 flow. Second operand 6 states and 1513 transitions. [2023-08-26 12:39:08,485 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 109 places, 260 transitions, 1027 flow [2023-08-26 12:39:08,488 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 108 places, 260 transitions, 1025 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 12:39:08,489 INFO L231 Difference]: Finished difference. Result has 108 places, 102 transitions, 259 flow [2023-08-26 12:39:08,489 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=473, PETRI_DIFFERENCE_MINUEND_FLOW=239, PETRI_DIFFERENCE_MINUEND_PLACES=103, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=100, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=96, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=259, PETRI_PLACES=108, PETRI_TRANSITIONS=102} [2023-08-26 12:39:08,490 INFO L281 CegarLoopForPetriNet]: 106 programPoint places, 2 predicate places. [2023-08-26 12:39:08,490 INFO L495 AbstractCegarLoop]: Abstraction has has 108 places, 102 transitions, 259 flow [2023-08-26 12:39:08,490 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 214.71428571428572) internal successors, (1503), 7 states have internal predecessors, (1503), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:39:08,490 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:39:08,490 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-26 12:39:08,505 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-08-26 12:39:08,695 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:39:08,695 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:39:08,695 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:39:08,695 INFO L85 PathProgramCache]: Analyzing trace with hash -975503234, now seen corresponding path program 1 times [2023-08-26 12:39:08,695 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:39:08,696 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [880502946] [2023-08-26 12:39:08,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:39:08,696 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:39:08,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:39:08,712 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 12:39:08,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:39:08,730 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 12:39:08,730 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 12:39:08,730 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (5 of 6 remaining) [2023-08-26 12:39:08,730 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 6 remaining) [2023-08-26 12:39:08,731 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 6 remaining) [2023-08-26 12:39:08,731 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 6 remaining) [2023-08-26 12:39:08,731 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 6 remaining) [2023-08-26 12:39:08,731 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (0 of 6 remaining) [2023-08-26 12:39:08,731 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-26 12:39:08,731 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 12:39:08,731 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 12:39:08,731 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 12:39:08,756 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-26 12:39:08,758 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 294 places, 347 transitions, 738 flow [2023-08-26 12:39:08,828 INFO L124 PetriNetUnfolderBase]: 114/766 cut-off events. [2023-08-26 12:39:08,829 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 12:39:08,837 INFO L83 FinitePrefix]: Finished finitePrefix Result has 821 conditions, 766 events. 114/766 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 3410 event pairs, 6 based on Foata normal form. 0/605 useless extension candidates. Maximal degree in co-relation 535. Up to 32 conditions per place. [2023-08-26 12:39:08,837 INFO L82 GeneralOperation]: Start removeDead. Operand has 294 places, 347 transitions, 738 flow [2023-08-26 12:39:08,843 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 294 places, 347 transitions, 738 flow [2023-08-26 12:39:08,843 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 12:39:08,843 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 294 places, 347 transitions, 738 flow [2023-08-26 12:39:08,843 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 294 places, 347 transitions, 738 flow [2023-08-26 12:39:08,843 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 294 places, 347 transitions, 738 flow [2023-08-26 12:39:08,915 INFO L124 PetriNetUnfolderBase]: 114/766 cut-off events. [2023-08-26 12:39:08,915 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 12:39:08,923 INFO L83 FinitePrefix]: Finished finitePrefix Result has 821 conditions, 766 events. 114/766 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 3410 event pairs, 6 based on Foata normal form. 0/605 useless extension candidates. Maximal degree in co-relation 535. Up to 32 conditions per place. [2023-08-26 12:39:08,946 INFO L119 LiptonReduction]: Number of co-enabled transitions 76632 [2023-08-26 12:39:12,169 INFO L134 LiptonReduction]: Checked pairs total: 226205 [2023-08-26 12:39:12,169 INFO L136 LiptonReduction]: Total number of compositions: 228 [2023-08-26 12:39:12,170 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 12:39:12,171 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@64422640, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 12:39:12,171 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-08-26 12:39:12,172 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 12:39:12,172 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 12:39:12,172 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:39:12,172 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:39:12,172 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:39:12,172 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 3 more)] === [2023-08-26 12:39:12,172 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:39:12,172 INFO L85 PathProgramCache]: Analyzing trace with hash 71212, now seen corresponding path program 1 times [2023-08-26 12:39:12,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:39:12,172 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1551403623] [2023-08-26 12:39:12,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:39:12,172 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:39:12,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:39:12,202 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 12:39:12,202 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:39:12,202 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1551403623] [2023-08-26 12:39:12,202 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1551403623] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:39:12,202 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:39:12,203 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:39:12,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692161316] [2023-08-26 12:39:12,203 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:39:12,203 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:39:12,203 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:39:12,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:39:12,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:39:12,204 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 268 out of 575 [2023-08-26 12:39:12,205 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 131 places, 180 transitions, 404 flow. Second operand has 3 states, 3 states have (on average 268.6666666666667) internal successors, (806), 3 states have internal predecessors, (806), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 12:39:12,205 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:39:12,205 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 268 of 575 [2023-08-26 12:39:12,205 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand