/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_28-funptr_racefree.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 12:38:35,795 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 12:38:35,883 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 12:38:35,888 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 12:38:35,888 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 12:38:35,925 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 12:38:35,926 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 12:38:35,927 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 12:38:35,927 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 12:38:35,931 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 12:38:35,931 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 12:38:35,931 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 12:38:35,932 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 12:38:35,933 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 12:38:35,933 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 12:38:35,933 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 12:38:35,934 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 12:38:35,934 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 12:38:35,934 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 12:38:35,934 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 12:38:35,934 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 12:38:35,935 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 12:38:35,935 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 12:38:35,936 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 12:38:35,936 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 12:38:35,936 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 12:38:35,936 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 12:38:35,937 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 12:38:35,937 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 12:38:35,937 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 12:38:35,938 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 12:38:35,938 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 12:38:35,938 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 12:38:35,938 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 12:38:35,939 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 12:38:35,939 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 12:38:36,233 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 12:38:36,260 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 12:38:36,263 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 12:38:36,264 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 12:38:36,264 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 12:38:36,265 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_28-funptr_racefree.i [2023-08-26 12:38:37,472 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 12:38:37,751 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 12:38:37,751 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_28-funptr_racefree.i [2023-08-26 12:38:37,774 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/40d816b9a/6aeb7f7df05e47ca9763c7725106c11b/FLAG146ac45a3 [2023-08-26 12:38:37,791 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/40d816b9a/6aeb7f7df05e47ca9763c7725106c11b [2023-08-26 12:38:37,795 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 12:38:37,798 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 12:38:37,801 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 12:38:37,801 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 12:38:37,804 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 12:38:37,805 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 12:38:37" (1/1) ... [2023-08-26 12:38:37,806 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23d7eb01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:37, skipping insertion in model container [2023-08-26 12:38:37,806 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 12:38:37" (1/1) ... [2023-08-26 12:38:37,858 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 12:38:38,284 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 12:38:38,299 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 12:38:38,319 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 12:38:38,320 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [244] [2023-08-26 12:38:38,327 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: unsigned short [736] [2023-08-26 12:38:38,349 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 12:38:38,397 WARN L669 CHandler]: The function g is called, but not defined or handled by StandardFunctionHandler. [2023-08-26 12:38:38,402 INFO L206 MainTranslator]: Completed translation [2023-08-26 12:38:38,402 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:38 WrapperNode [2023-08-26 12:38:38,402 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 12:38:38,403 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 12:38:38,403 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 12:38:38,403 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 12:38:38,409 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:38" (1/1) ... [2023-08-26 12:38:38,431 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:38" (1/1) ... [2023-08-26 12:38:38,468 INFO L138 Inliner]: procedures = 273, calls = 43, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 127 [2023-08-26 12:38:38,469 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 12:38:38,470 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 12:38:38,470 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 12:38:38,470 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 12:38:38,477 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:38" (1/1) ... [2023-08-26 12:38:38,477 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:38" (1/1) ... [2023-08-26 12:38:38,491 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:38" (1/1) ... [2023-08-26 12:38:38,492 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:38" (1/1) ... [2023-08-26 12:38:38,498 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:38" (1/1) ... [2023-08-26 12:38:38,513 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:38" (1/1) ... [2023-08-26 12:38:38,515 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:38" (1/1) ... [2023-08-26 12:38:38,516 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:38" (1/1) ... [2023-08-26 12:38:38,519 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 12:38:38,519 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 12:38:38,519 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 12:38:38,520 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 12:38:38,520 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:38" (1/1) ... [2023-08-26 12:38:38,534 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 12:38:38,546 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:38:38,558 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 12:38:38,567 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 12:38:38,594 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 12:38:38,594 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 12:38:38,594 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 12:38:38,595 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 12:38:38,595 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-26 12:38:38,595 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 12:38:38,595 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-26 12:38:38,595 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-26 12:38:38,595 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 12:38:38,595 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 12:38:38,595 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 12:38:38,597 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 12:38:38,762 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 12:38:38,764 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 12:38:39,077 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 12:38:39,083 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 12:38:39,083 INFO L302 CfgBuilder]: Removed 10 assume(true) statements. [2023-08-26 12:38:39,087 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 12:38:39 BoogieIcfgContainer [2023-08-26 12:38:39,087 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 12:38:39,089 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 12:38:39,089 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 12:38:39,092 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 12:38:39,092 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 12:38:37" (1/3) ... [2023-08-26 12:38:39,093 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3415f63f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 12:38:39, skipping insertion in model container [2023-08-26 12:38:39,094 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 12:38:38" (2/3) ... [2023-08-26 12:38:39,095 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3415f63f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 12:38:39, skipping insertion in model container [2023-08-26 12:38:39,095 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 12:38:39" (3/3) ... [2023-08-26 12:38:39,096 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_28-funptr_racefree.i [2023-08-26 12:38:39,112 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 12:38:39,112 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2023-08-26 12:38:39,112 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 12:38:39,189 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-26 12:38:39,228 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 119 places, 129 transitions, 266 flow [2023-08-26 12:38:39,278 INFO L124 PetriNetUnfolderBase]: 19/176 cut-off events. [2023-08-26 12:38:39,278 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 12:38:39,284 INFO L83 FinitePrefix]: Finished finitePrefix Result has 182 conditions, 176 events. 19/176 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 449 event pairs, 0 based on Foata normal form. 0/144 useless extension candidates. Maximal degree in co-relation 88. Up to 4 conditions per place. [2023-08-26 12:38:39,284 INFO L82 GeneralOperation]: Start removeDead. Operand has 119 places, 129 transitions, 266 flow [2023-08-26 12:38:39,288 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 119 places, 129 transitions, 266 flow [2023-08-26 12:38:39,291 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 12:38:39,299 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 119 places, 129 transitions, 266 flow [2023-08-26 12:38:39,302 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 119 places, 129 transitions, 266 flow [2023-08-26 12:38:39,302 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 119 places, 129 transitions, 266 flow [2023-08-26 12:38:39,330 INFO L124 PetriNetUnfolderBase]: 19/176 cut-off events. [2023-08-26 12:38:39,331 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 12:38:39,332 INFO L83 FinitePrefix]: Finished finitePrefix Result has 182 conditions, 176 events. 19/176 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 449 event pairs, 0 based on Foata normal form. 0/144 useless extension candidates. Maximal degree in co-relation 88. Up to 4 conditions per place. [2023-08-26 12:38:39,334 INFO L119 LiptonReduction]: Number of co-enabled transitions 3816 [2023-08-26 12:38:42,653 INFO L134 LiptonReduction]: Checked pairs total: 8148 [2023-08-26 12:38:42,653 INFO L136 LiptonReduction]: Total number of compositions: 107 [2023-08-26 12:38:42,665 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 12:38:42,675 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;@53c292, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 12:38:42,675 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-08-26 12:38:42,683 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 12:38:42,683 INFO L124 PetriNetUnfolderBase]: 0/3 cut-off events. [2023-08-26 12:38:42,683 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:38:42,683 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:42,684 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:38:42,685 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 12:38:42,691 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:42,691 INFO L85 PathProgramCache]: Analyzing trace with hash 15685, now seen corresponding path program 1 times [2023-08-26 12:38:42,699 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:42,699 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112699595] [2023-08-26 12:38:42,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:42,700 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:42,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:42,959 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 12:38:42,959 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:42,959 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112699595] [2023-08-26 12:38:42,960 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112699595] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:38:42,960 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:38:42,961 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:38:42,966 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888382573] [2023-08-26 12:38:42,967 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:38:42,974 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:38:42,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:43,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:38:43,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:38:43,008 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 98 out of 236 [2023-08-26 12:38:43,013 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 38 places, 46 transitions, 100 flow. Second operand has 3 states, 3 states have (on average 98.66666666666667) internal successors, (296), 3 states have internal predecessors, (296), 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 12:38:43,013 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:43,013 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 98 of 236 [2023-08-26 12:38:43,015 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:43,163 INFO L124 PetriNetUnfolderBase]: 141/340 cut-off events. [2023-08-26 12:38:43,164 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 12:38:43,165 INFO L83 FinitePrefix]: Finished finitePrefix Result has 670 conditions, 340 events. 141/340 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 20. Compared 1394 event pairs, 130 based on Foata normal form. 27/290 useless extension candidates. Maximal degree in co-relation 622. Up to 299 conditions per place. [2023-08-26 12:38:43,167 INFO L140 encePairwiseOnDemand]: 222/236 looper letters, 25 selfloop transitions, 1 changer transitions 12/43 dead transitions. [2023-08-26 12:38:43,167 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 43 transitions, 170 flow [2023-08-26 12:38:43,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:38:43,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:38:43,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 350 transitions. [2023-08-26 12:38:43,179 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4943502824858757 [2023-08-26 12:38:43,180 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 350 transitions. [2023-08-26 12:38:43,180 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 350 transitions. [2023-08-26 12:38:43,181 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:43,183 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 350 transitions. [2023-08-26 12:38:43,187 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 116.66666666666667) internal successors, (350), 3 states have internal predecessors, (350), 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 12:38:43,190 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 236.0) internal successors, (944), 4 states have internal predecessors, (944), 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 12:38:43,191 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 236.0) internal successors, (944), 4 states have internal predecessors, (944), 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 12:38:43,192 INFO L175 Difference]: Start difference. First operand has 38 places, 46 transitions, 100 flow. Second operand 3 states and 350 transitions. [2023-08-26 12:38:43,193 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 43 transitions, 170 flow [2023-08-26 12:38:43,195 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 43 transitions, 170 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 12:38:43,196 INFO L231 Difference]: Finished difference. Result has 37 places, 31 transitions, 72 flow [2023-08-26 12:38:43,197 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=236, PETRI_DIFFERENCE_MINUEND_FLOW=74, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=33, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=32, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=72, PETRI_PLACES=37, PETRI_TRANSITIONS=31} [2023-08-26 12:38:43,200 INFO L281 CegarLoopForPetriNet]: 38 programPoint places, -1 predicate places. [2023-08-26 12:38:43,200 INFO L495 AbstractCegarLoop]: Abstraction has has 37 places, 31 transitions, 72 flow [2023-08-26 12:38:43,201 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 98.66666666666667) internal successors, (296), 3 states have internal predecessors, (296), 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 12:38:43,201 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:43,201 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:38:43,201 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 12:38:43,201 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 12:38:43,202 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:43,202 INFO L85 PathProgramCache]: Analyzing trace with hash 15687, now seen corresponding path program 1 times [2023-08-26 12:38:43,202 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:43,202 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117986346] [2023-08-26 12:38:43,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:43,203 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:43,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:43,309 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 12:38:43,309 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:43,309 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117986346] [2023-08-26 12:38:43,310 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [117986346] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:38:43,310 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:38:43,310 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:38:43,310 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899248685] [2023-08-26 12:38:43,310 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:38:43,311 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:38:43,312 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:43,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:38:43,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:38:43,313 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 93 out of 236 [2023-08-26 12:38:43,314 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 37 places, 31 transitions, 72 flow. Second operand has 3 states, 3 states have (on average 93.66666666666667) internal successors, (281), 3 states have internal predecessors, (281), 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 12:38:43,314 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:43,314 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 93 of 236 [2023-08-26 12:38:43,314 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:43,421 INFO L124 PetriNetUnfolderBase]: 120/304 cut-off events. [2023-08-26 12:38:43,421 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 12:38:43,423 INFO L83 FinitePrefix]: Finished finitePrefix Result has 592 conditions, 304 events. 120/304 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 1370 event pairs, 0 based on Foata normal form. 0/259 useless extension candidates. Maximal degree in co-relation 585. Up to 257 conditions per place. [2023-08-26 12:38:43,425 INFO L140 encePairwiseOnDemand]: 232/236 looper letters, 35 selfloop transitions, 2 changer transitions 0/42 dead transitions. [2023-08-26 12:38:43,425 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 42 transitions, 168 flow [2023-08-26 12:38:43,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:38:43,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:38:43,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 318 transitions. [2023-08-26 12:38:43,430 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4491525423728814 [2023-08-26 12:38:43,431 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 318 transitions. [2023-08-26 12:38:43,431 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 318 transitions. [2023-08-26 12:38:43,432 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:43,432 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 318 transitions. [2023-08-26 12:38:43,434 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 106.0) internal successors, (318), 3 states have internal predecessors, (318), 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 12:38:43,437 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 236.0) internal successors, (944), 4 states have internal predecessors, (944), 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 12:38:43,437 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 236.0) internal successors, (944), 4 states have internal predecessors, (944), 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 12:38:43,438 INFO L175 Difference]: Start difference. First operand has 37 places, 31 transitions, 72 flow. Second operand 3 states and 318 transitions. [2023-08-26 12:38:43,438 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 42 transitions, 168 flow [2023-08-26 12:38:43,439 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 36 places, 42 transitions, 167 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 12:38:43,440 INFO L231 Difference]: Finished difference. Result has 37 places, 31 transitions, 81 flow [2023-08-26 12:38:43,440 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=236, PETRI_DIFFERENCE_MINUEND_FLOW=71, PETRI_DIFFERENCE_MINUEND_PLACES=34, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=31, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=81, PETRI_PLACES=37, PETRI_TRANSITIONS=31} [2023-08-26 12:38:43,442 INFO L281 CegarLoopForPetriNet]: 38 programPoint places, -1 predicate places. [2023-08-26 12:38:43,443 INFO L495 AbstractCegarLoop]: Abstraction has has 37 places, 31 transitions, 81 flow [2023-08-26 12:38:43,444 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 93.66666666666667) internal successors, (281), 3 states have internal predecessors, (281), 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 12:38:43,446 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:43,446 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 12:38:43,446 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-26 12:38:43,447 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 12:38:43,450 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:43,450 INFO L85 PathProgramCache]: Analyzing trace with hash 467655120, now seen corresponding path program 1 times [2023-08-26 12:38:43,451 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:43,455 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566393500] [2023-08-26 12:38:43,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:43,455 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:43,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:43,566 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 12:38:43,567 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:43,567 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566393500] [2023-08-26 12:38:43,567 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [566393500] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 12:38:43,567 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1017073800] [2023-08-26 12:38:43,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:43,568 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:38:43,568 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:38:43,570 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 12:38:43,584 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 12:38:43,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:43,649 INFO L262 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 12:38:43,664 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 12:38:43,716 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 12:38:43,762 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 12:38:43,762 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 12:38:43,808 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 12:38:43,808 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1017073800] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 12:38:43,808 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 12:38:43,808 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 12:38:43,809 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879786135] [2023-08-26 12:38:43,809 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 12:38:43,809 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 12:38:43,809 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:43,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 12:38:43,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 12:38:43,811 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 93 out of 236 [2023-08-26 12:38:43,812 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 37 places, 31 transitions, 81 flow. Second operand has 8 states, 8 states have (on average 94.875) internal successors, (759), 8 states have internal predecessors, (759), 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 12:38:43,812 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:43,812 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 93 of 236 [2023-08-26 12:38:43,812 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:43,885 INFO L124 PetriNetUnfolderBase]: 20/61 cut-off events. [2023-08-26 12:38:43,886 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 12:38:43,886 INFO L83 FinitePrefix]: Finished finitePrefix Result has 149 conditions, 61 events. 20/61 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 98 event pairs, 9 based on Foata normal form. 11/72 useless extension candidates. Maximal degree in co-relation 140. Up to 42 conditions per place. [2023-08-26 12:38:43,886 INFO L140 encePairwiseOnDemand]: 232/236 looper letters, 23 selfloop transitions, 2 changer transitions 0/28 dead transitions. [2023-08-26 12:38:43,886 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 27 places, 28 transitions, 118 flow [2023-08-26 12:38:43,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 12:38:43,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 12:38:43,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 399 transitions. [2023-08-26 12:38:43,889 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4226694915254237 [2023-08-26 12:38:43,889 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 399 transitions. [2023-08-26 12:38:43,889 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 399 transitions. [2023-08-26 12:38:43,889 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:43,890 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 399 transitions. [2023-08-26 12:38:43,891 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 99.75) internal successors, (399), 4 states have internal predecessors, (399), 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 12:38:43,892 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 236.0) internal successors, (1180), 5 states have internal predecessors, (1180), 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 12:38:43,893 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 236.0) internal successors, (1180), 5 states have internal predecessors, (1180), 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 12:38:43,893 INFO L175 Difference]: Start difference. First operand has 37 places, 31 transitions, 81 flow. Second operand 4 states and 399 transitions. [2023-08-26 12:38:43,893 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 27 places, 28 transitions, 118 flow [2023-08-26 12:38:43,894 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 24 places, 28 transitions, 112 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-08-26 12:38:43,894 INFO L231 Difference]: Finished difference. Result has 24 places, 17 transitions, 44 flow [2023-08-26 12:38:43,894 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=236, PETRI_DIFFERENCE_MINUEND_FLOW=40, PETRI_DIFFERENCE_MINUEND_PLACES=21, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=17, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=15, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=44, PETRI_PLACES=24, PETRI_TRANSITIONS=17} [2023-08-26 12:38:43,895 INFO L281 CegarLoopForPetriNet]: 38 programPoint places, -14 predicate places. [2023-08-26 12:38:43,895 INFO L495 AbstractCegarLoop]: Abstraction has has 24 places, 17 transitions, 44 flow [2023-08-26 12:38:43,896 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 94.875) internal successors, (759), 8 states have internal predecessors, (759), 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 12:38:43,896 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:43,896 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-26 12:38:43,905 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 12:38:44,102 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 12:38:44,102 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 12:38:44,103 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:44,103 INFO L85 PathProgramCache]: Analyzing trace with hash 1612407153, now seen corresponding path program 1 times [2023-08-26 12:38:44,103 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:44,103 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313235291] [2023-08-26 12:38:44,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:44,103 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:44,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:38:44,125 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 12:38:44,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:38:44,154 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 12:38:44,155 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 12:38:44,155 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (5 of 6 remaining) [2023-08-26 12:38:44,157 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 6 remaining) [2023-08-26 12:38:44,157 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 6 remaining) [2023-08-26 12:38:44,157 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 6 remaining) [2023-08-26 12:38:44,158 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 6 remaining) [2023-08-26 12:38:44,158 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (0 of 6 remaining) [2023-08-26 12:38:44,158 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 12:38:44,158 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 12:38:44,160 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 12:38:44,160 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 12:38:44,189 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-26 12:38:44,192 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 152 places, 167 transitions, 352 flow [2023-08-26 12:38:44,231 INFO L124 PetriNetUnfolderBase]: 34/288 cut-off events. [2023-08-26 12:38:44,231 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 12:38:44,234 INFO L83 FinitePrefix]: Finished finitePrefix Result has 302 conditions, 288 events. 34/288 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 911 event pairs, 0 based on Foata normal form. 0/233 useless extension candidates. Maximal degree in co-relation 178. Up to 8 conditions per place. [2023-08-26 12:38:44,234 INFO L82 GeneralOperation]: Start removeDead. Operand has 152 places, 167 transitions, 352 flow [2023-08-26 12:38:44,236 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 152 places, 167 transitions, 352 flow [2023-08-26 12:38:44,236 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 12:38:44,237 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 152 places, 167 transitions, 352 flow [2023-08-26 12:38:44,237 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 152 places, 167 transitions, 352 flow [2023-08-26 12:38:44,237 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 152 places, 167 transitions, 352 flow [2023-08-26 12:38:44,268 INFO L124 PetriNetUnfolderBase]: 34/288 cut-off events. [2023-08-26 12:38:44,268 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 12:38:44,270 INFO L83 FinitePrefix]: Finished finitePrefix Result has 302 conditions, 288 events. 34/288 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 911 event pairs, 0 based on Foata normal form. 0/233 useless extension candidates. Maximal degree in co-relation 178. Up to 8 conditions per place. [2023-08-26 12:38:44,277 INFO L119 LiptonReduction]: Number of co-enabled transitions 11016 [2023-08-26 12:38:47,378 INFO L134 LiptonReduction]: Checked pairs total: 27016 [2023-08-26 12:38:47,378 INFO L136 LiptonReduction]: Total number of compositions: 124 [2023-08-26 12:38:47,380 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 12:38:47,381 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;@53c292, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 12:38:47,381 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-08-26 12:38:47,382 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 12:38:47,382 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 12:38:47,382 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:38:47,382 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:47,382 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:38:47,383 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 12:38:47,383 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:47,383 INFO L85 PathProgramCache]: Analyzing trace with hash 26215, now seen corresponding path program 1 times [2023-08-26 12:38:47,383 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:47,383 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [994913278] [2023-08-26 12:38:47,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:47,383 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:47,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:47,420 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 12:38:47,421 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:47,424 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [994913278] [2023-08-26 12:38:47,424 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [994913278] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:38:47,424 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:38:47,424 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:38:47,424 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153730255] [2023-08-26 12:38:47,425 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:38:47,425 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:38:47,426 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:47,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:38:47,427 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:38:47,427 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 128 out of 291 [2023-08-26 12:38:47,428 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 58 places, 70 transitions, 158 flow. Second operand has 3 states, 3 states have (on average 128.66666666666666) internal successors, (386), 3 states have internal predecessors, (386), 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 12:38:47,428 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:47,428 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 128 of 291 [2023-08-26 12:38:47,428 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:48,064 INFO L124 PetriNetUnfolderBase]: 3724/6557 cut-off events. [2023-08-26 12:38:48,064 INFO L125 PetriNetUnfolderBase]: For 69/69 co-relation queries the response was YES. [2023-08-26 12:38:48,074 INFO L83 FinitePrefix]: Finished finitePrefix Result has 12598 conditions, 6557 events. 3724/6557 cut-off events. For 69/69 co-relation queries the response was YES. Maximal size of possible extension queue 195. Compared 42341 event pairs, 3448 based on Foata normal form. 877/6480 useless extension candidates. Maximal degree in co-relation 8697. Up to 5548 conditions per place. [2023-08-26 12:38:48,103 INFO L140 encePairwiseOnDemand]: 272/291 looper letters, 38 selfloop transitions, 1 changer transitions 23/74 dead transitions. [2023-08-26 12:38:48,103 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 58 places, 74 transitions, 290 flow [2023-08-26 12:38:48,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:38:48,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:38:48,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 475 transitions. [2023-08-26 12:38:48,105 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5441008018327605 [2023-08-26 12:38:48,105 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 475 transitions. [2023-08-26 12:38:48,105 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 475 transitions. [2023-08-26 12:38:48,105 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:48,106 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 475 transitions. [2023-08-26 12:38:48,107 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 158.33333333333334) internal successors, (475), 3 states have internal predecessors, (475), 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 12:38:48,108 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 291.0) internal successors, (1164), 4 states have internal predecessors, (1164), 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 12:38:48,109 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 291.0) internal successors, (1164), 4 states have internal predecessors, (1164), 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 12:38:48,109 INFO L175 Difference]: Start difference. First operand has 58 places, 70 transitions, 158 flow. Second operand 3 states and 475 transitions. [2023-08-26 12:38:48,109 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 58 places, 74 transitions, 290 flow [2023-08-26 12:38:48,112 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 58 places, 74 transitions, 290 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 12:38:48,114 INFO L231 Difference]: Finished difference. Result has 58 places, 51 transitions, 122 flow [2023-08-26 12:38:48,114 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=291, PETRI_DIFFERENCE_MINUEND_FLOW=124, PETRI_DIFFERENCE_MINUEND_PLACES=56, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=53, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=52, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=122, PETRI_PLACES=58, PETRI_TRANSITIONS=51} [2023-08-26 12:38:48,115 INFO L281 CegarLoopForPetriNet]: 58 programPoint places, 0 predicate places. [2023-08-26 12:38:48,116 INFO L495 AbstractCegarLoop]: Abstraction has has 58 places, 51 transitions, 122 flow [2023-08-26 12:38:48,116 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 128.66666666666666) internal successors, (386), 3 states have internal predecessors, (386), 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 12:38:48,116 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:48,116 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:38:48,117 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 12:38:48,117 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 12:38:48,117 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:48,117 INFO L85 PathProgramCache]: Analyzing trace with hash 26214, now seen corresponding path program 1 times [2023-08-26 12:38:48,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:48,118 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [779071740] [2023-08-26 12:38:48,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:48,118 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:48,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:48,178 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 12:38:48,179 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:48,179 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [779071740] [2023-08-26 12:38:48,179 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [779071740] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:38:48,179 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:38:48,179 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:38:48,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783939138] [2023-08-26 12:38:48,180 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:38:48,180 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:38:48,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:48,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:38:48,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:38:48,181 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 123 out of 291 [2023-08-26 12:38:48,182 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 58 places, 51 transitions, 122 flow. Second operand has 3 states, 3 states have (on average 123.66666666666667) internal successors, (371), 3 states have internal predecessors, (371), 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 12:38:48,182 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:48,182 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 123 of 291 [2023-08-26 12:38:48,182 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:48,601 INFO L124 PetriNetUnfolderBase]: 3209/5579 cut-off events. [2023-08-26 12:38:48,601 INFO L125 PetriNetUnfolderBase]: For 55/55 co-relation queries the response was YES. [2023-08-26 12:38:48,610 INFO L83 FinitePrefix]: Finished finitePrefix Result has 10815 conditions, 5579 events. 3209/5579 cut-off events. For 55/55 co-relation queries the response was YES. Maximal size of possible extension queue 174. Compared 35282 event pairs, 1480 based on Foata normal form. 0/4894 useless extension candidates. Maximal degree in co-relation 10807. Up to 5130 conditions per place. [2023-08-26 12:38:48,636 INFO L140 encePairwiseOnDemand]: 287/291 looper letters, 50 selfloop transitions, 2 changer transitions 0/64 dead transitions. [2023-08-26 12:38:48,636 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 58 places, 64 transitions, 252 flow [2023-08-26 12:38:48,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:38:48,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:38:48,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 423 transitions. [2023-08-26 12:38:48,638 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4845360824742268 [2023-08-26 12:38:48,638 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 423 transitions. [2023-08-26 12:38:48,638 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 423 transitions. [2023-08-26 12:38:48,638 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:48,638 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 423 transitions. [2023-08-26 12:38:48,639 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 141.0) internal successors, (423), 3 states have internal predecessors, (423), 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 12:38:48,641 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 291.0) internal successors, (1164), 4 states have internal predecessors, (1164), 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 12:38:48,641 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 291.0) internal successors, (1164), 4 states have internal predecessors, (1164), 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 12:38:48,642 INFO L175 Difference]: Start difference. First operand has 58 places, 51 transitions, 122 flow. Second operand 3 states and 423 transitions. [2023-08-26 12:38:48,642 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 58 places, 64 transitions, 252 flow [2023-08-26 12:38:48,643 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 57 places, 64 transitions, 251 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 12:38:48,644 INFO L231 Difference]: Finished difference. Result has 58 places, 52 transitions, 135 flow [2023-08-26 12:38:48,644 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=291, PETRI_DIFFERENCE_MINUEND_FLOW=121, PETRI_DIFFERENCE_MINUEND_PLACES=55, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=51, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=49, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=135, PETRI_PLACES=58, PETRI_TRANSITIONS=52} [2023-08-26 12:38:48,645 INFO L281 CegarLoopForPetriNet]: 58 programPoint places, 0 predicate places. [2023-08-26 12:38:48,645 INFO L495 AbstractCegarLoop]: Abstraction has has 58 places, 52 transitions, 135 flow [2023-08-26 12:38:48,645 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 123.66666666666667) internal successors, (371), 3 states have internal predecessors, (371), 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 12:38:48,645 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:48,645 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 12:38:48,645 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 12:38:48,646 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 12:38:48,646 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:48,646 INFO L85 PathProgramCache]: Analyzing trace with hash -1538449033, now seen corresponding path program 1 times [2023-08-26 12:38:48,646 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:48,646 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [515616961] [2023-08-26 12:38:48,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:48,647 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:48,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:48,724 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 12:38:48,724 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:48,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [515616961] [2023-08-26 12:38:48,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [515616961] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 12:38:48,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [541203247] [2023-08-26 12:38:48,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:48,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:38:48,725 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:38:48,729 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 12:38:48,755 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 12:38:48,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:48,802 INFO L262 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 12:38:48,804 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 12:38:48,819 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 12:38:48,864 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 12:38:48,864 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 12:38:48,904 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 12:38:48,905 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [541203247] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 12:38:48,905 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 12:38:48,905 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 12:38:48,905 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649294933] [2023-08-26 12:38:48,905 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 12:38:48,906 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 12:38:48,906 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:48,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 12:38:48,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 12:38:48,907 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 123 out of 291 [2023-08-26 12:38:48,909 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 58 places, 52 transitions, 135 flow. Second operand has 8 states, 8 states have (on average 124.875) internal successors, (999), 8 states have internal predecessors, (999), 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 12:38:48,909 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:48,909 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 123 of 291 [2023-08-26 12:38:48,909 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:49,124 INFO L124 PetriNetUnfolderBase]: 625/1231 cut-off events. [2023-08-26 12:38:49,124 INFO L125 PetriNetUnfolderBase]: For 312/312 co-relation queries the response was YES. [2023-08-26 12:38:49,127 INFO L83 FinitePrefix]: Finished finitePrefix Result has 2684 conditions, 1231 events. 625/1231 cut-off events. For 312/312 co-relation queries the response was YES. Maximal size of possible extension queue 54. Compared 6556 event pairs, 60 based on Foata normal form. 144/1362 useless extension candidates. Maximal degree in co-relation 2674. Up to 746 conditions per place. [2023-08-26 12:38:49,132 INFO L140 encePairwiseOnDemand]: 287/291 looper letters, 58 selfloop transitions, 3 changer transitions 0/70 dead transitions. [2023-08-26 12:38:49,132 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 48 places, 70 transitions, 283 flow [2023-08-26 12:38:49,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 12:38:49,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 12:38:49,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 680 transitions. [2023-08-26 12:38:49,134 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46735395189003437 [2023-08-26 12:38:49,134 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 680 transitions. [2023-08-26 12:38:49,134 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 680 transitions. [2023-08-26 12:38:49,135 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:49,135 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 680 transitions. [2023-08-26 12:38:49,136 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 136.0) internal successors, (680), 5 states have internal predecessors, (680), 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 12:38:49,138 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 291.0) internal successors, (1746), 6 states have internal predecessors, (1746), 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 12:38:49,138 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 291.0) internal successors, (1746), 6 states have internal predecessors, (1746), 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 12:38:49,138 INFO L175 Difference]: Start difference. First operand has 58 places, 52 transitions, 135 flow. Second operand 5 states and 680 transitions. [2023-08-26 12:38:49,139 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 48 places, 70 transitions, 283 flow [2023-08-26 12:38:49,140 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 47 places, 70 transitions, 279 flow, removed 1 selfloop flow, removed 1 redundant places. [2023-08-26 12:38:49,141 INFO L231 Difference]: Finished difference. Result has 47 places, 36 transitions, 95 flow [2023-08-26 12:38:49,141 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=291, PETRI_DIFFERENCE_MINUEND_FLOW=89, PETRI_DIFFERENCE_MINUEND_PLACES=43, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=36, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=33, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=95, PETRI_PLACES=47, PETRI_TRANSITIONS=36} [2023-08-26 12:38:49,141 INFO L281 CegarLoopForPetriNet]: 58 programPoint places, -11 predicate places. [2023-08-26 12:38:49,142 INFO L495 AbstractCegarLoop]: Abstraction has has 47 places, 36 transitions, 95 flow [2023-08-26 12:38:49,142 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 124.875) internal successors, (999), 8 states have internal predecessors, (999), 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 12:38:49,142 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:49,142 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-26 12:38:49,151 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-08-26 12:38:49,347 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 12:38:49,348 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 12:38:49,348 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:49,348 INFO L85 PathProgramCache]: Analyzing trace with hash 1205317453, now seen corresponding path program 1 times [2023-08-26 12:38:49,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:49,348 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1390211911] [2023-08-26 12:38:49,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:49,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:49,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:38:49,371 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 12:38:49,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:38:49,388 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 12:38:49,389 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 12:38:49,389 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (5 of 6 remaining) [2023-08-26 12:38:49,389 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 6 remaining) [2023-08-26 12:38:49,389 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 6 remaining) [2023-08-26 12:38:49,389 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 6 remaining) [2023-08-26 12:38:49,389 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 6 remaining) [2023-08-26 12:38:49,389 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (0 of 6 remaining) [2023-08-26 12:38:49,390 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-26 12:38:49,390 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 12:38:49,390 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 12:38:49,390 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 12:38:49,416 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-26 12:38:49,418 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 185 places, 205 transitions, 440 flow [2023-08-26 12:38:49,462 INFO L124 PetriNetUnfolderBase]: 54/437 cut-off events. [2023-08-26 12:38:49,462 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 12:38:49,466 INFO L83 FinitePrefix]: Finished finitePrefix Result has 465 conditions, 437 events. 54/437 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1616 event pairs, 1 based on Foata normal form. 0/351 useless extension candidates. Maximal degree in co-relation 296. Up to 16 conditions per place. [2023-08-26 12:38:49,467 INFO L82 GeneralOperation]: Start removeDead. Operand has 185 places, 205 transitions, 440 flow [2023-08-26 12:38:49,470 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 185 places, 205 transitions, 440 flow [2023-08-26 12:38:49,470 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 12:38:49,470 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 185 places, 205 transitions, 440 flow [2023-08-26 12:38:49,470 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 185 places, 205 transitions, 440 flow [2023-08-26 12:38:49,470 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 185 places, 205 transitions, 440 flow [2023-08-26 12:38:49,512 INFO L124 PetriNetUnfolderBase]: 54/437 cut-off events. [2023-08-26 12:38:49,513 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 12:38:49,517 INFO L83 FinitePrefix]: Finished finitePrefix Result has 465 conditions, 437 events. 54/437 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 1616 event pairs, 1 based on Foata normal form. 0/351 useless extension candidates. Maximal degree in co-relation 296. Up to 16 conditions per place. [2023-08-26 12:38:49,532 INFO L119 LiptonReduction]: Number of co-enabled transitions 20736 [2023-08-26 12:38:52,828 INFO L134 LiptonReduction]: Checked pairs total: 55591 [2023-08-26 12:38:52,828 INFO L136 LiptonReduction]: Total number of compositions: 145 [2023-08-26 12:38:52,829 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 12:38:52,830 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;@53c292, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 12:38:52,830 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-08-26 12:38:52,831 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 12:38:52,831 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 12:38:52,831 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:38:52,831 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:52,831 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:38:52,831 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 12:38:52,832 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:52,832 INFO L85 PathProgramCache]: Analyzing trace with hash 38631, now seen corresponding path program 1 times [2023-08-26 12:38:52,832 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:52,832 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1015110049] [2023-08-26 12:38:52,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:52,832 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:52,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:52,860 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 12:38:52,861 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:52,861 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1015110049] [2023-08-26 12:38:52,861 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1015110049] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:38:52,861 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:38:52,861 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:38:52,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835277922] [2023-08-26 12:38:52,861 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:38:52,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:38:52,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:52,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:38:52,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:38:52,863 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 158 out of 350 [2023-08-26 12:38:52,863 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 76 places, 94 transitions, 218 flow. Second operand has 3 states, 3 states have (on average 158.66666666666666) internal successors, (476), 3 states have internal predecessors, (476), 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 12:38:52,864 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:52,864 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 158 of 350 [2023-08-26 12:38:52,864 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:38:58,542 INFO L124 PetriNetUnfolderBase]: 53612/82227 cut-off events. [2023-08-26 12:38:58,542 INFO L125 PetriNetUnfolderBase]: For 1335/1335 co-relation queries the response was YES. [2023-08-26 12:38:58,676 INFO L83 FinitePrefix]: Finished finitePrefix Result has 158150 conditions, 82227 events. 53612/82227 cut-off events. For 1335/1335 co-relation queries the response was YES. Maximal size of possible extension queue 1923. Compared 648978 event pairs, 49550 based on Foata normal form. 14311/86918 useless extension candidates. Maximal degree in co-relation 67043. Up to 69461 conditions per place. [2023-08-26 12:38:58,958 INFO L140 encePairwiseOnDemand]: 324/350 looper letters, 48 selfloop transitions, 1 changer transitions 31/98 dead transitions. [2023-08-26 12:38:58,959 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 75 places, 98 transitions, 386 flow [2023-08-26 12:38:58,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:38:58,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:38:58,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 596 transitions. [2023-08-26 12:38:58,961 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5676190476190476 [2023-08-26 12:38:58,961 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 596 transitions. [2023-08-26 12:38:58,961 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 596 transitions. [2023-08-26 12:38:58,961 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:38:58,962 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 596 transitions. [2023-08-26 12:38:58,962 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 198.66666666666666) internal successors, (596), 3 states have internal predecessors, (596), 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 12:38:58,964 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 350.0) internal successors, (1400), 4 states have internal predecessors, (1400), 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 12:38:58,964 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 350.0) internal successors, (1400), 4 states have internal predecessors, (1400), 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 12:38:58,964 INFO L175 Difference]: Start difference. First operand has 76 places, 94 transitions, 218 flow. Second operand 3 states and 596 transitions. [2023-08-26 12:38:58,964 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 75 places, 98 transitions, 386 flow [2023-08-26 12:38:58,966 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 75 places, 98 transitions, 386 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 12:38:58,967 INFO L231 Difference]: Finished difference. Result has 75 places, 67 transitions, 166 flow [2023-08-26 12:38:58,967 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=350, PETRI_DIFFERENCE_MINUEND_FLOW=168, PETRI_DIFFERENCE_MINUEND_PLACES=73, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=69, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=68, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=166, PETRI_PLACES=75, PETRI_TRANSITIONS=67} [2023-08-26 12:38:58,968 INFO L281 CegarLoopForPetriNet]: 76 programPoint places, -1 predicate places. [2023-08-26 12:38:58,968 INFO L495 AbstractCegarLoop]: Abstraction has has 75 places, 67 transitions, 166 flow [2023-08-26 12:38:58,968 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 158.66666666666666) internal successors, (476), 3 states have internal predecessors, (476), 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 12:38:58,969 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:38:58,969 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:38:58,969 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 12:38:58,969 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 12:38:58,969 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:38:58,969 INFO L85 PathProgramCache]: Analyzing trace with hash 38632, now seen corresponding path program 1 times [2023-08-26 12:38:58,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:38:58,970 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773052021] [2023-08-26 12:38:58,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:38:58,970 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:38:58,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:38:59,050 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 12:38:59,051 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:38:59,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773052021] [2023-08-26 12:38:59,051 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1773052021] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:38:59,051 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:38:59,051 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:38:59,051 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816389308] [2023-08-26 12:38:59,052 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:38:59,052 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:38:59,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:38:59,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:38:59,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:38:59,053 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 153 out of 350 [2023-08-26 12:38:59,053 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 75 places, 67 transitions, 166 flow. Second operand has 3 states, 3 states have (on average 153.66666666666666) internal successors, (461), 3 states have internal predecessors, (461), 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 12:38:59,054 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:38:59,054 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 153 of 350 [2023-08-26 12:38:59,054 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:39:03,300 INFO L124 PetriNetUnfolderBase]: 46217/72040 cut-off events. [2023-08-26 12:39:03,300 INFO L125 PetriNetUnfolderBase]: For 1407/1407 co-relation queries the response was YES. [2023-08-26 12:39:03,434 INFO L83 FinitePrefix]: Finished finitePrefix Result has 137711 conditions, 72040 events. 46217/72040 cut-off events. For 1407/1407 co-relation queries the response was YES. Maximal size of possible extension queue 1696. Compared 572550 event pairs, 29638 based on Foata normal form. 0/65571 useless extension candidates. Maximal degree in co-relation 137702. Up to 64618 conditions per place. [2023-08-26 12:39:03,722 INFO L140 encePairwiseOnDemand]: 346/350 looper letters, 60 selfloop transitions, 2 changer transitions 0/80 dead transitions. [2023-08-26 12:39:03,723 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 75 places, 80 transitions, 316 flow [2023-08-26 12:39:03,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 12:39:03,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 12:39:03,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 523 transitions. [2023-08-26 12:39:03,725 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4980952380952381 [2023-08-26 12:39:03,725 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 523 transitions. [2023-08-26 12:39:03,725 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 523 transitions. [2023-08-26 12:39:03,726 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:39:03,726 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 523 transitions. [2023-08-26 12:39:03,727 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 174.33333333333334) internal successors, (523), 3 states have internal predecessors, (523), 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 12:39:03,729 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 350.0) internal successors, (1400), 4 states have internal predecessors, (1400), 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 12:39:03,729 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 350.0) internal successors, (1400), 4 states have internal predecessors, (1400), 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 12:39:03,730 INFO L175 Difference]: Start difference. First operand has 75 places, 67 transitions, 166 flow. Second operand 3 states and 523 transitions. [2023-08-26 12:39:03,730 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 75 places, 80 transitions, 316 flow [2023-08-26 12:39:03,732 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 74 places, 80 transitions, 315 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 12:39:03,734 INFO L231 Difference]: Finished difference. Result has 75 places, 68 transitions, 179 flow [2023-08-26 12:39:03,734 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=350, PETRI_DIFFERENCE_MINUEND_FLOW=165, PETRI_DIFFERENCE_MINUEND_PLACES=72, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=67, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=65, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=179, PETRI_PLACES=75, PETRI_TRANSITIONS=68} [2023-08-26 12:39:03,735 INFO L281 CegarLoopForPetriNet]: 76 programPoint places, -1 predicate places. [2023-08-26 12:39:03,735 INFO L495 AbstractCegarLoop]: Abstraction has has 75 places, 68 transitions, 179 flow [2023-08-26 12:39:03,736 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 153.66666666666666) internal successors, (461), 3 states have internal predecessors, (461), 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 12:39:03,736 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:39:03,736 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 12:39:03,736 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-26 12:39:03,736 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 12:39:03,737 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:39:03,737 INFO L85 PathProgramCache]: Analyzing trace with hash 1347408371, now seen corresponding path program 1 times [2023-08-26 12:39:03,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:39:03,737 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [644486641] [2023-08-26 12:39:03,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:39:03,737 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:39:03,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:39:03,824 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 12:39:03,825 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:39:03,825 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [644486641] [2023-08-26 12:39:03,825 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [644486641] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 12:39:03,825 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1106337140] [2023-08-26 12:39:03,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:39:03,825 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 12:39:03,826 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 12:39:03,827 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 12:39:03,829 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 12:39:03,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:39:03,897 INFO L262 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 12:39:03,898 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 12:39:03,908 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 12:39:03,946 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 12:39:03,947 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 12:39:03,985 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 12:39:03,985 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1106337140] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 12:39:03,985 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 12:39:03,985 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 5 [2023-08-26 12:39:03,986 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945523497] [2023-08-26 12:39:03,986 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 12:39:03,986 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 12:39:03,986 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:39:03,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 12:39:03,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2023-08-26 12:39:03,988 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 153 out of 350 [2023-08-26 12:39:03,989 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 75 places, 68 transitions, 179 flow. Second operand has 7 states, 7 states have (on average 154.71428571428572) internal successors, (1083), 7 states have internal predecessors, (1083), 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 12:39:03,989 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:39:03,989 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 153 of 350 [2023-08-26 12:39:03,989 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 12:39:07,868 INFO L124 PetriNetUnfolderBase]: 42650/64537 cut-off events. [2023-08-26 12:39:07,869 INFO L125 PetriNetUnfolderBase]: For 5927/5927 co-relation queries the response was YES. [2023-08-26 12:39:07,992 INFO L83 FinitePrefix]: Finished finitePrefix Result has 131395 conditions, 64537 events. 42650/64537 cut-off events. For 5927/5927 co-relation queries the response was YES. Maximal size of possible extension queue 1522. Compared 501647 event pairs, 803 based on Foata normal form. 12/61632 useless extension candidates. Maximal degree in co-relation 131384. Up to 46395 conditions per place. [2023-08-26 12:39:08,400 INFO L140 encePairwiseOnDemand]: 346/350 looper letters, 137 selfloop transitions, 6 changer transitions 0/161 dead transitions. [2023-08-26 12:39:08,400 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 79 places, 161 transitions, 653 flow [2023-08-26 12:39:08,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 12:39:08,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 12:39:08,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1065 transitions. [2023-08-26 12:39:08,407 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5071428571428571 [2023-08-26 12:39:08,407 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1065 transitions. [2023-08-26 12:39:08,407 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1065 transitions. [2023-08-26 12:39:08,408 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 12:39:08,408 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1065 transitions. [2023-08-26 12:39:08,414 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 177.5) internal successors, (1065), 6 states have internal predecessors, (1065), 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 12:39:08,418 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 350.0) internal successors, (2450), 7 states have internal predecessors, (2450), 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 12:39:08,419 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 350.0) internal successors, (2450), 7 states have internal predecessors, (2450), 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 12:39:08,419 INFO L175 Difference]: Start difference. First operand has 75 places, 68 transitions, 179 flow. Second operand 6 states and 1065 transitions. [2023-08-26 12:39:08,419 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 79 places, 161 transitions, 653 flow [2023-08-26 12:39:08,424 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 78 places, 161 transitions, 651 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 12:39:08,427 INFO L231 Difference]: Finished difference. Result has 78 places, 69 transitions, 193 flow [2023-08-26 12:39:08,428 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=350, PETRI_DIFFERENCE_MINUEND_FLOW=173, PETRI_DIFFERENCE_MINUEND_PLACES=73, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=67, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=63, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=193, PETRI_PLACES=78, PETRI_TRANSITIONS=69} [2023-08-26 12:39:08,428 INFO L281 CegarLoopForPetriNet]: 76 programPoint places, 2 predicate places. [2023-08-26 12:39:08,428 INFO L495 AbstractCegarLoop]: Abstraction has has 78 places, 69 transitions, 193 flow [2023-08-26 12:39:08,429 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 154.71428571428572) internal successors, (1083), 7 states have internal predecessors, (1083), 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 12:39:08,429 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:39:08,429 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-26 12:39:08,440 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-08-26 12:39:08,634 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 12:39:08,634 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 12:39:08,635 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:39:08,635 INFO L85 PathProgramCache]: Analyzing trace with hash -1667693729, now seen corresponding path program 1 times [2023-08-26 12:39:08,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:39:08,635 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672700986] [2023-08-26 12:39:08,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:39:08,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:39:08,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:39:08,657 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 12:39:08,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 12:39:08,688 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 12:39:08,688 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 12:39:08,688 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (5 of 6 remaining) [2023-08-26 12:39:08,688 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 6 remaining) [2023-08-26 12:39:08,689 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 6 remaining) [2023-08-26 12:39:08,689 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 6 remaining) [2023-08-26 12:39:08,689 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 6 remaining) [2023-08-26 12:39:08,689 INFO L805 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (0 of 6 remaining) [2023-08-26 12:39:08,689 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-26 12:39:08,689 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 12:39:08,690 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 12:39:08,690 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 12:39:08,722 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-26 12:39:08,725 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 218 places, 243 transitions, 530 flow [2023-08-26 12:39:08,795 INFO L124 PetriNetUnfolderBase]: 86/662 cut-off events. [2023-08-26 12:39:08,795 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 12:39:08,804 INFO L83 FinitePrefix]: Finished finitePrefix Result has 717 conditions, 662 events. 86/662 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2776 event pairs, 6 based on Foata normal form. 0/529 useless extension candidates. Maximal degree in co-relation 457. Up to 32 conditions per place. [2023-08-26 12:39:08,804 INFO L82 GeneralOperation]: Start removeDead. Operand has 218 places, 243 transitions, 530 flow [2023-08-26 12:39:08,809 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 218 places, 243 transitions, 530 flow [2023-08-26 12:39:08,809 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 12:39:08,809 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 218 places, 243 transitions, 530 flow [2023-08-26 12:39:08,809 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 218 places, 243 transitions, 530 flow [2023-08-26 12:39:08,809 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 218 places, 243 transitions, 530 flow [2023-08-26 12:39:08,876 INFO L124 PetriNetUnfolderBase]: 86/662 cut-off events. [2023-08-26 12:39:08,876 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 12:39:08,885 INFO L83 FinitePrefix]: Finished finitePrefix Result has 717 conditions, 662 events. 86/662 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2776 event pairs, 6 based on Foata normal form. 0/529 useless extension candidates. Maximal degree in co-relation 457. Up to 32 conditions per place. [2023-08-26 12:39:08,906 INFO L119 LiptonReduction]: Number of co-enabled transitions 33264 [2023-08-26 12:39:11,862 INFO L134 LiptonReduction]: Checked pairs total: 91449 [2023-08-26 12:39:11,863 INFO L136 LiptonReduction]: Total number of compositions: 168 [2023-08-26 12:39:11,864 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 12:39:11,864 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;@53c292, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 12:39:11,864 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-08-26 12:39:11,865 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 12:39:11,866 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 12:39:11,866 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 12:39:11,866 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 12:39:11,866 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 12:39:11,866 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 12:39:11,866 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 12:39:11,866 INFO L85 PathProgramCache]: Analyzing trace with hash 52978, now seen corresponding path program 1 times [2023-08-26 12:39:11,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 12:39:11,866 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [221075939] [2023-08-26 12:39:11,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 12:39:11,867 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 12:39:11,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 12:39:11,941 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 12:39:11,941 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 12:39:11,941 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [221075939] [2023-08-26 12:39:11,941 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [221075939] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 12:39:11,941 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 12:39:11,941 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 12:39:11,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499601059] [2023-08-26 12:39:11,943 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 12:39:11,943 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 12:39:11,943 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 12:39:11,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 12:39:11,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 12:39:11,945 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 183 out of 411 [2023-08-26 12:39:11,946 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 92 places, 114 transitions, 272 flow. Second operand has 3 states, 3 states have (on average 183.66666666666666) internal successors, (551), 3 states have internal predecessors, (551), 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 12:39:11,946 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 12:39:11,946 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 183 of 411 [2023-08-26 12:39:11,946 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand