/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 --traceabstraction.order.of.the.error.locations.to.be.checked INSUFFICIENT_FIRST -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/weaver/chl-nzb-file-trans.wvr.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 16:26:51,623 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 16:26:51,700 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 16:26:51,706 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 16:26:51,706 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 16:26:51,742 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 16:26:51,743 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 16:26:51,743 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 16:26:51,744 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 16:26:51,747 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 16:26:51,748 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 16:26:51,748 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 16:26:51,748 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 16:26:51,749 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 16:26:51,750 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 16:26:51,750 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 16:26:51,750 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 16:26:51,750 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 16:26:51,750 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 16:26:51,751 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 16:26:51,751 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 16:26:51,752 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 16:26:51,752 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 16:26:51,752 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 16:26:51,753 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 16:26:51,753 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 16:26:51,753 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 16:26:51,753 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 16:26:51,753 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 16:26:51,754 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 16:26:51,754 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 16:26:51,755 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 16:26:51,755 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 16:26:51,755 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 16:26:51,755 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 16:26:51,755 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> INSUFFICIENT_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 16:26:52,065 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 16:26:52,082 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 16:26:52,084 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 16:26:52,085 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 16:26:52,085 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 16:26:52,086 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/weaver/chl-nzb-file-trans.wvr.c [2023-08-26 16:26:53,318 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 16:26:53,582 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 16:26:53,583 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/weaver/chl-nzb-file-trans.wvr.c [2023-08-26 16:26:53,601 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8599e6c2d/22ad57bded0746a796844329885e7dda/FLAG39f259896 [2023-08-26 16:26:53,616 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8599e6c2d/22ad57bded0746a796844329885e7dda [2023-08-26 16:26:53,621 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 16:26:53,622 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 16:26:53,625 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 16:26:53,625 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 16:26:53,628 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 16:26:53,628 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 04:26:53" (1/1) ... [2023-08-26 16:26:53,629 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@20083485 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:26:53, skipping insertion in model container [2023-08-26 16:26:53,629 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 04:26:53" (1/1) ... [2023-08-26 16:26:53,657 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 16:26:53,900 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 16:26:53,911 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 16:26:53,968 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 16:26:53,983 INFO L206 MainTranslator]: Completed translation [2023-08-26 16:26:53,983 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:26:53 WrapperNode [2023-08-26 16:26:53,983 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 16:26:53,985 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 16:26:53,985 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 16:26:53,985 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 16:26:53,991 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:26:53" (1/1) ... [2023-08-26 16:26:54,010 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:26:53" (1/1) ... [2023-08-26 16:26:54,050 INFO L138 Inliner]: procedures = 26, calls = 77, calls flagged for inlining = 29, calls inlined = 43, statements flattened = 606 [2023-08-26 16:26:54,051 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 16:26:54,051 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 16:26:54,051 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 16:26:54,051 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 16:26:54,062 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:26:53" (1/1) ... [2023-08-26 16:26:54,062 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:26:53" (1/1) ... [2023-08-26 16:26:54,072 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:26:53" (1/1) ... [2023-08-26 16:26:54,072 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:26:53" (1/1) ... [2023-08-26 16:26:54,086 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:26:53" (1/1) ... [2023-08-26 16:26:54,091 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:26:53" (1/1) ... [2023-08-26 16:26:54,094 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:26:53" (1/1) ... [2023-08-26 16:26:54,097 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:26:53" (1/1) ... [2023-08-26 16:26:54,102 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 16:26:54,103 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 16:26:54,103 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 16:26:54,104 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 16:26:54,104 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:26:53" (1/1) ... [2023-08-26 16:26:54,116 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 16:26:54,141 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:26:54,157 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 16:26:54,180 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 16:26:54,195 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 16:26:54,195 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 16:26:54,195 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 16:26:54,195 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 16:26:54,195 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2023-08-26 16:26:54,195 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2023-08-26 16:26:54,195 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2023-08-26 16:26:54,196 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2023-08-26 16:26:54,196 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2023-08-26 16:26:54,196 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2023-08-26 16:26:54,197 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 16:26:54,197 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-08-26 16:26:54,197 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 16:26:54,197 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 16:26:54,197 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 16:26:54,199 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 16:26:54,320 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 16:26:54,321 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 16:26:55,173 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 16:26:55,190 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 16:26:55,191 INFO L302 CfgBuilder]: Removed 6 assume(true) statements. [2023-08-26 16:26:55,194 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 04:26:55 BoogieIcfgContainer [2023-08-26 16:26:55,195 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 16:26:55,197 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 16:26:55,197 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 16:26:55,199 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 16:26:55,199 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 04:26:53" (1/3) ... [2023-08-26 16:26:55,200 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4267a0f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 04:26:55, skipping insertion in model container [2023-08-26 16:26:55,200 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 04:26:53" (2/3) ... [2023-08-26 16:26:55,200 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4267a0f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 04:26:55, skipping insertion in model container [2023-08-26 16:26:55,201 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 04:26:55" (3/3) ... [2023-08-26 16:26:55,202 INFO L112 eAbstractionObserver]: Analyzing ICFG chl-nzb-file-trans.wvr.c [2023-08-26 16:26:55,220 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 16:26:55,221 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 67 error locations. [2023-08-26 16:26:55,221 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 16:26:55,391 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-26 16:26:55,444 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 724 places, 787 transitions, 1598 flow [2023-08-26 16:26:55,814 INFO L124 PetriNetUnfolderBase]: 73/784 cut-off events. [2023-08-26 16:26:55,815 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2023-08-26 16:26:55,840 INFO L83 FinitePrefix]: Finished finitePrefix Result has 797 conditions, 784 events. 73/784 cut-off events. For 3/3 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 2894 event pairs, 0 based on Foata normal form. 0/644 useless extension candidates. Maximal degree in co-relation 579. Up to 2 conditions per place. [2023-08-26 16:26:55,841 INFO L82 GeneralOperation]: Start removeDead. Operand has 724 places, 787 transitions, 1598 flow [2023-08-26 16:26:55,865 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 710 places, 773 transitions, 1564 flow [2023-08-26 16:26:55,869 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 16:26:55,880 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 710 places, 773 transitions, 1564 flow [2023-08-26 16:26:55,883 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 710 places, 773 transitions, 1564 flow [2023-08-26 16:26:55,884 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 710 places, 773 transitions, 1564 flow [2023-08-26 16:26:56,095 INFO L124 PetriNetUnfolderBase]: 73/773 cut-off events. [2023-08-26 16:26:56,096 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2023-08-26 16:26:56,112 INFO L83 FinitePrefix]: Finished finitePrefix Result has 786 conditions, 773 events. 73/773 cut-off events. For 3/3 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 2896 event pairs, 0 based on Foata normal form. 0/634 useless extension candidates. Maximal degree in co-relation 579. Up to 2 conditions per place. [2023-08-26 16:26:56,173 INFO L119 LiptonReduction]: Number of co-enabled transitions 196080 [2023-08-26 16:27:30,663 INFO L134 LiptonReduction]: Checked pairs total: 223696 [2023-08-26 16:27:30,663 INFO L136 LiptonReduction]: Total number of compositions: 1062 [2023-08-26 16:27:30,675 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 16:27:30,681 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;@5d6875c9, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 16:27:30,681 INFO L358 AbstractCegarLoop]: Starting to check reachability of 118 error locations. [2023-08-26 16:27:30,683 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 16:27:30,683 INFO L124 PetriNetUnfolderBase]: 1/2 cut-off events. [2023-08-26 16:27:30,683 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 16:27:30,683 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:27:30,684 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 16:27:30,684 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:27:30,687 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:27:30,687 INFO L85 PathProgramCache]: Analyzing trace with hash 111277, now seen corresponding path program 1 times [2023-08-26 16:27:30,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:27:30,696 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [951661104] [2023-08-26 16:27:30,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:27:30,696 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:27:30,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:27:30,971 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 16:27:30,971 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:27:30,971 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [951661104] [2023-08-26 16:27:30,972 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [951661104] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:27:30,972 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:27:30,972 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 16:27:30,973 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135718792] [2023-08-26 16:27:30,974 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:27:30,980 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 16:27:30,985 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:27:31,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 16:27:31,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 16:27:31,006 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 653 out of 1849 [2023-08-26 16:27:31,013 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 112 places, 114 transitions, 246 flow. Second operand has 3 states, 3 states have (on average 653.6666666666666) internal successors, (1961), 3 states have internal predecessors, (1961), 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 16:27:31,014 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:27:31,014 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 653 of 1849 [2023-08-26 16:27:31,015 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:27:39,434 INFO L124 PetriNetUnfolderBase]: 60044/80331 cut-off events. [2023-08-26 16:27:39,434 INFO L125 PetriNetUnfolderBase]: For 1046/1046 co-relation queries the response was YES. [2023-08-26 16:27:39,533 INFO L83 FinitePrefix]: Finished finitePrefix Result has 161889 conditions, 80331 events. 60044/80331 cut-off events. For 1046/1046 co-relation queries the response was YES. Maximal size of possible extension queue 3541. Compared 480075 event pairs, 49669 based on Foata normal form. 0/26045 useless extension candidates. Maximal degree in co-relation 156348. Up to 80331 conditions per place. [2023-08-26 16:27:39,908 INFO L140 encePairwiseOnDemand]: 1827/1849 looper letters, 92 selfloop transitions, 1 changer transitions 0/93 dead transitions. [2023-08-26 16:27:39,908 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 93 places, 93 transitions, 390 flow [2023-08-26 16:27:39,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 16:27:39,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 16:27:39,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 2073 transitions. [2023-08-26 16:27:39,930 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.37371552190373175 [2023-08-26 16:27:39,930 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 2073 transitions. [2023-08-26 16:27:39,931 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 2073 transitions. [2023-08-26 16:27:39,935 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:27:39,938 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 2073 transitions. [2023-08-26 16:27:39,946 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 691.0) internal successors, (2073), 3 states have internal predecessors, (2073), 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 16:27:39,961 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 1849.0) internal successors, (7396), 4 states have internal predecessors, (7396), 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 16:27:39,965 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 1849.0) internal successors, (7396), 4 states have internal predecessors, (7396), 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 16:27:39,967 INFO L175 Difference]: Start difference. First operand has 112 places, 114 transitions, 246 flow. Second operand 3 states and 2073 transitions. [2023-08-26 16:27:39,968 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 93 places, 93 transitions, 390 flow [2023-08-26 16:27:40,009 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 87 places, 93 transitions, 378 flow, removed 0 selfloop flow, removed 6 redundant places. [2023-08-26 16:27:40,011 INFO L231 Difference]: Finished difference. Result has 87 places, 93 transitions, 194 flow [2023-08-26 16:27:40,013 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=192, PETRI_DIFFERENCE_MINUEND_PLACES=85, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=93, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=92, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=194, PETRI_PLACES=87, PETRI_TRANSITIONS=93} [2023-08-26 16:27:40,016 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -25 predicate places. [2023-08-26 16:27:40,016 INFO L495 AbstractCegarLoop]: Abstraction has has 87 places, 93 transitions, 194 flow [2023-08-26 16:27:40,018 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 653.6666666666666) internal successors, (1961), 3 states have internal predecessors, (1961), 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 16:27:40,018 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:27:40,018 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 16:27:40,019 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 16:27:40,019 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:27:40,026 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:27:40,027 INFO L85 PathProgramCache]: Analyzing trace with hash 111278, now seen corresponding path program 1 times [2023-08-26 16:27:40,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:27:40,027 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504882614] [2023-08-26 16:27:40,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:27:40,028 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:27:40,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:27:40,238 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 16:27:40,238 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:27:40,238 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504882614] [2023-08-26 16:27:40,238 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1504882614] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:27:40,239 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:27:40,239 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 16:27:40,239 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345577104] [2023-08-26 16:27:40,239 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:27:40,240 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 16:27:40,240 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:27:40,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 16:27:40,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 16:27:40,244 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 633 out of 1849 [2023-08-26 16:27:40,247 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 87 places, 93 transitions, 194 flow. Second operand has 3 states, 3 states have (on average 633.6666666666666) internal successors, (1901), 3 states have internal predecessors, (1901), 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 16:27:40,247 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:27:40,247 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 633 of 1849 [2023-08-26 16:27:40,247 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:27:47,781 INFO L124 PetriNetUnfolderBase]: 60049/80339 cut-off events. [2023-08-26 16:27:47,782 INFO L125 PetriNetUnfolderBase]: For 171/171 co-relation queries the response was YES. [2023-08-26 16:27:47,851 INFO L83 FinitePrefix]: Finished finitePrefix Result has 161189 conditions, 80339 events. 60049/80339 cut-off events. For 171/171 co-relation queries the response was YES. Maximal size of possible extension queue 3541. Compared 480006 event pairs, 49669 based on Foata normal form. 0/26048 useless extension candidates. Maximal degree in co-relation 161183. Up to 80335 conditions per place. [2023-08-26 16:27:48,148 INFO L140 encePairwiseOnDemand]: 1837/1849 looper letters, 92 selfloop transitions, 9 changer transitions 0/101 dead transitions. [2023-08-26 16:27:48,150 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 89 places, 101 transitions, 412 flow [2023-08-26 16:27:48,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 16:27:48,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 16:27:48,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 2003 transitions. [2023-08-26 16:27:48,157 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.36109608797548226 [2023-08-26 16:27:48,157 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 2003 transitions. [2023-08-26 16:27:48,157 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 2003 transitions. [2023-08-26 16:27:48,159 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:27:48,159 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 2003 transitions. [2023-08-26 16:27:48,163 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 667.6666666666666) internal successors, (2003), 3 states have internal predecessors, (2003), 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 16:27:48,173 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 1849.0) internal successors, (7396), 4 states have internal predecessors, (7396), 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 16:27:48,177 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 1849.0) internal successors, (7396), 4 states have internal predecessors, (7396), 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 16:27:48,177 INFO L175 Difference]: Start difference. First operand has 87 places, 93 transitions, 194 flow. Second operand 3 states and 2003 transitions. [2023-08-26 16:27:48,177 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 89 places, 101 transitions, 412 flow [2023-08-26 16:27:48,178 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 88 places, 101 transitions, 411 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 16:27:48,181 INFO L231 Difference]: Finished difference. Result has 90 places, 101 transitions, 267 flow [2023-08-26 16:27:48,181 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=193, PETRI_DIFFERENCE_MINUEND_PLACES=86, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=93, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=84, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=267, PETRI_PLACES=90, PETRI_TRANSITIONS=101} [2023-08-26 16:27:48,183 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -22 predicate places. [2023-08-26 16:27:48,183 INFO L495 AbstractCegarLoop]: Abstraction has has 90 places, 101 transitions, 267 flow [2023-08-26 16:27:48,186 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 633.6666666666666) internal successors, (1901), 3 states have internal predecessors, (1901), 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 16:27:48,187 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:27:48,187 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2023-08-26 16:27:48,187 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-26 16:27:48,188 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:27:48,190 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:27:48,190 INFO L85 PathProgramCache]: Analyzing trace with hash 3459154, now seen corresponding path program 1 times [2023-08-26 16:27:48,190 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:27:48,195 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [826693736] [2023-08-26 16:27:48,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:27:48,196 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:27:48,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:27:48,363 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 16:27:48,364 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:27:48,364 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [826693736] [2023-08-26 16:27:48,364 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [826693736] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:27:48,364 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [972662743] [2023-08-26 16:27:48,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:27:48,366 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:27:48,366 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:27:48,368 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 16:27:48,372 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 16:27:48,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:27:48,501 INFO L262 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 13 conjunts are in the unsatisfiable core [2023-08-26 16:27:48,505 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:27:48,605 INFO L322 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2023-08-26 16:27:48,610 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 3 case distinctions, treesize of input 15 treesize of output 42 [2023-08-26 16:27:48,662 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 16:27:48,663 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:27:48,698 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 16:27:48,699 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [972662743] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:27:48,699 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:27:48,699 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 16:27:48,699 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552833998] [2023-08-26 16:27:48,699 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:27:48,700 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 16:27:48,700 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:27:48,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 16:27:48,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2023-08-26 16:27:48,704 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 633 out of 1849 [2023-08-26 16:27:48,710 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 90 places, 101 transitions, 267 flow. Second operand has 8 states, 8 states have (on average 634.125) internal successors, (5073), 8 states have internal predecessors, (5073), 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 16:27:48,710 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:27:48,710 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 633 of 1849 [2023-08-26 16:27:48,710 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:27:56,319 INFO L124 PetriNetUnfolderBase]: 60054/80353 cut-off events. [2023-08-26 16:27:56,319 INFO L125 PetriNetUnfolderBase]: For 171/171 co-relation queries the response was YES. [2023-08-26 16:27:56,426 INFO L83 FinitePrefix]: Finished finitePrefix Result has 161262 conditions, 80353 events. 60054/80353 cut-off events. For 171/171 co-relation queries the response was YES. Maximal size of possible extension queue 3534. Compared 480227 event pairs, 49669 based on Foata normal form. 4/26067 useless extension candidates. Maximal degree in co-relation 161253. Up to 80338 conditions per place. [2023-08-26 16:27:56,702 INFO L140 encePairwiseOnDemand]: 1837/1849 looper letters, 90 selfloop transitions, 25 changer transitions 0/115 dead transitions. [2023-08-26 16:27:56,702 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 95 places, 115 transitions, 555 flow [2023-08-26 16:27:56,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 16:27:56,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 16:27:56,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 3932 transitions. [2023-08-26 16:27:56,714 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.35442581575626464 [2023-08-26 16:27:56,714 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 3932 transitions. [2023-08-26 16:27:56,714 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 3932 transitions. [2023-08-26 16:27:56,716 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:27:56,716 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 3932 transitions. [2023-08-26 16:27:56,723 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 655.3333333333334) internal successors, (3932), 6 states have internal predecessors, (3932), 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 16:27:56,908 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 1849.0) internal successors, (12943), 7 states have internal predecessors, (12943), 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 16:27:56,914 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 1849.0) internal successors, (12943), 7 states have internal predecessors, (12943), 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 16:27:56,914 INFO L175 Difference]: Start difference. First operand has 90 places, 101 transitions, 267 flow. Second operand 6 states and 3932 transitions. [2023-08-26 16:27:56,914 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 95 places, 115 transitions, 555 flow [2023-08-26 16:27:56,916 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 93 places, 115 transitions, 535 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 16:27:56,919 INFO L231 Difference]: Finished difference. Result has 96 places, 115 transitions, 413 flow [2023-08-26 16:27:56,919 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=229, PETRI_DIFFERENCE_MINUEND_PLACES=88, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=96, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=12, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=84, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=413, PETRI_PLACES=96, PETRI_TRANSITIONS=115} [2023-08-26 16:27:56,921 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -16 predicate places. [2023-08-26 16:27:56,921 INFO L495 AbstractCegarLoop]: Abstraction has has 96 places, 115 transitions, 413 flow [2023-08-26 16:27:56,924 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 634.125) internal successors, (5073), 8 states have internal predecessors, (5073), 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 16:27:56,924 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:27:56,924 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 1, 1] [2023-08-26 16:27:56,933 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-08-26 16:27:57,130 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 16:27:57,130 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:27:57,131 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:27:57,131 INFO L85 PathProgramCache]: Analyzing trace with hash -18089042, now seen corresponding path program 2 times [2023-08-26 16:27:57,131 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:27:57,131 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2132459314] [2023-08-26 16:27:57,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:27:57,131 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:27:57,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:27:57,476 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 16:27:57,476 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:27:57,476 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2132459314] [2023-08-26 16:27:57,476 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2132459314] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:27:57,476 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [497750098] [2023-08-26 16:27:57,476 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-08-26 16:27:57,477 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:27:57,477 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:27:57,478 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 16:27:57,500 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 16:27:57,608 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-08-26 16:27:57,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-08-26 16:27:57,609 INFO L262 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 13 conjunts are in the unsatisfiable core [2023-08-26 16:27:57,612 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:27:57,672 INFO L322 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2023-08-26 16:27:57,672 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 3 case distinctions, treesize of input 15 treesize of output 42 [2023-08-26 16:27:57,824 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 16:27:57,824 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-08-26 16:27:57,824 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [497750098] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:27:57,824 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-08-26 16:27:57,824 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 10 [2023-08-26 16:27:57,825 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991658318] [2023-08-26 16:27:57,825 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:27:57,825 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 16:27:57,825 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:27:57,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 16:27:57,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2023-08-26 16:27:57,829 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 633 out of 1849 [2023-08-26 16:27:57,832 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 96 places, 115 transitions, 413 flow. Second operand has 7 states, 7 states have (on average 633.8571428571429) internal successors, (4437), 7 states have internal predecessors, (4437), 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 16:27:57,832 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:27:57,832 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 633 of 1849 [2023-08-26 16:27:57,832 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:28:05,409 INFO L124 PetriNetUnfolderBase]: 60054/80350 cut-off events. [2023-08-26 16:28:05,409 INFO L125 PetriNetUnfolderBase]: For 174/174 co-relation queries the response was YES. [2023-08-26 16:28:05,554 INFO L83 FinitePrefix]: Finished finitePrefix Result has 161296 conditions, 80350 events. 60054/80350 cut-off events. For 174/174 co-relation queries the response was YES. Maximal size of possible extension queue 3503. Compared 479411 event pairs, 49669 based on Foata normal form. 3/26063 useless extension candidates. Maximal degree in co-relation 161284. Up to 80329 conditions per place. [2023-08-26 16:28:05,811 INFO L140 encePairwiseOnDemand]: 1837/1849 looper letters, 84 selfloop transitions, 28 changer transitions 0/112 dead transitions. [2023-08-26 16:28:05,812 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 99 places, 112 transitions, 607 flow [2023-08-26 16:28:05,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 16:28:05,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 16:28:05,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 4546 transitions. [2023-08-26 16:28:05,823 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.35123232635401375 [2023-08-26 16:28:05,823 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 4546 transitions. [2023-08-26 16:28:05,823 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 4546 transitions. [2023-08-26 16:28:05,825 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:28:05,825 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 4546 transitions. [2023-08-26 16:28:05,833 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 649.4285714285714) internal successors, (4546), 7 states have internal predecessors, (4546), 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 16:28:05,848 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 1849.0) internal successors, (14792), 8 states have internal predecessors, (14792), 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 16:28:05,850 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 1849.0) internal successors, (14792), 8 states have internal predecessors, (14792), 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 16:28:05,851 INFO L175 Difference]: Start difference. First operand has 96 places, 115 transitions, 413 flow. Second operand 7 states and 4546 transitions. [2023-08-26 16:28:05,851 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 99 places, 112 transitions, 607 flow [2023-08-26 16:28:05,852 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 94 places, 112 transitions, 517 flow, removed 21 selfloop flow, removed 5 redundant places. [2023-08-26 16:28:05,854 INFO L231 Difference]: Finished difference. Result has 94 places, 112 transitions, 349 flow [2023-08-26 16:28:05,854 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=293, PETRI_DIFFERENCE_MINUEND_PLACES=88, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=112, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=28, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=84, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=349, PETRI_PLACES=94, PETRI_TRANSITIONS=112} [2023-08-26 16:28:05,855 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -18 predicate places. [2023-08-26 16:28:05,855 INFO L495 AbstractCegarLoop]: Abstraction has has 94 places, 112 transitions, 349 flow [2023-08-26 16:28:05,857 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 633.8571428571429) internal successors, (4437), 7 states have internal predecessors, (4437), 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 16:28:05,857 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:28:05,857 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1] [2023-08-26 16:28:05,867 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 16:28:06,062 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,SelfDestructingSolverStorable3 [2023-08-26 16:28:06,062 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:28:06,063 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:28:06,063 INFO L85 PathProgramCache]: Analyzing trace with hash -329522673, now seen corresponding path program 1 times [2023-08-26 16:28:06,063 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:28:06,063 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1060360591] [2023-08-26 16:28:06,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:28:06,063 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:28:06,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:28:06,174 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-08-26 16:28:06,174 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:28:06,174 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1060360591] [2023-08-26 16:28:06,174 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1060360591] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:28:06,175 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1335664655] [2023-08-26 16:28:06,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:28:06,175 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:28:06,175 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:28:06,176 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 16:28:06,178 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 16:28:06,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:28:06,349 INFO L262 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 6 conjunts are in the unsatisfiable core [2023-08-26 16:28:06,351 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:28:06,395 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-08-26 16:28:06,395 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:28:06,426 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-08-26 16:28:06,426 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1335664655] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:28:06,427 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:28:06,427 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 11 [2023-08-26 16:28:06,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070527341] [2023-08-26 16:28:06,427 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:28:06,428 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-08-26 16:28:06,428 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:28:06,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-08-26 16:28:06,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2023-08-26 16:28:06,434 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 707 out of 1849 [2023-08-26 16:28:06,439 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 94 places, 112 transitions, 349 flow. Second operand has 11 states, 11 states have (on average 708.6363636363636) internal successors, (7795), 11 states have internal predecessors, (7795), 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 16:28:06,439 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:28:06,439 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 707 of 1849 [2023-08-26 16:28:06,440 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:28:13,929 INFO L124 PetriNetUnfolderBase]: 60044/80343 cut-off events. [2023-08-26 16:28:13,929 INFO L125 PetriNetUnfolderBase]: For 171/171 co-relation queries the response was YES. [2023-08-26 16:28:14,030 INFO L83 FinitePrefix]: Finished finitePrefix Result has 161240 conditions, 80343 events. 60044/80343 cut-off events. For 171/171 co-relation queries the response was YES. Maximal size of possible extension queue 3502. Compared 478714 event pairs, 49669 based on Foata normal form. 3/26066 useless extension candidates. Maximal degree in co-relation 161231. Up to 80329 conditions per place. [2023-08-26 16:28:14,250 INFO L140 encePairwiseOnDemand]: 1840/1849 looper letters, 87 selfloop transitions, 18 changer transitions 0/105 dead transitions. [2023-08-26 16:28:14,250 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 100 places, 105 transitions, 511 flow [2023-08-26 16:28:14,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 16:28:14,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 16:28:14,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 5069 transitions. [2023-08-26 16:28:14,263 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3916402688712045 [2023-08-26 16:28:14,263 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 5069 transitions. [2023-08-26 16:28:14,263 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 5069 transitions. [2023-08-26 16:28:14,266 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:28:14,266 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 5069 transitions. [2023-08-26 16:28:14,274 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 724.1428571428571) internal successors, (5069), 7 states have internal predecessors, (5069), 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 16:28:14,287 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 1849.0) internal successors, (14792), 8 states have internal predecessors, (14792), 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 16:28:14,289 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 1849.0) internal successors, (14792), 8 states have internal predecessors, (14792), 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 16:28:14,290 INFO L175 Difference]: Start difference. First operand has 94 places, 112 transitions, 349 flow. Second operand 7 states and 5069 transitions. [2023-08-26 16:28:14,290 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 100 places, 105 transitions, 511 flow [2023-08-26 16:28:14,291 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 95 places, 105 transitions, 483 flow, removed 0 selfloop flow, removed 5 redundant places. [2023-08-26 16:28:14,292 INFO L231 Difference]: Finished difference. Result has 96 places, 105 transitions, 327 flow [2023-08-26 16:28:14,293 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=261, PETRI_DIFFERENCE_MINUEND_PLACES=89, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=102, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=15, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=84, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=327, PETRI_PLACES=96, PETRI_TRANSITIONS=105} [2023-08-26 16:28:14,293 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -16 predicate places. [2023-08-26 16:28:14,293 INFO L495 AbstractCegarLoop]: Abstraction has has 96 places, 105 transitions, 327 flow [2023-08-26 16:28:14,295 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 708.6363636363636) internal successors, (7795), 11 states have internal predecessors, (7795), 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 16:28:14,295 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:28:14,295 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 1, 1, 1, 1] [2023-08-26 16:28:14,303 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 16:28:14,500 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:28:14,501 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:28:14,501 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:28:14,501 INFO L85 PathProgramCache]: Analyzing trace with hash -2032926300, now seen corresponding path program 1 times [2023-08-26 16:28:14,501 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:28:14,502 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2066132557] [2023-08-26 16:28:14,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:28:14,502 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:28:14,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:28:15,251 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-08-26 16:28:15,251 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:28:15,251 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2066132557] [2023-08-26 16:28:15,251 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2066132557] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:28:15,251 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:28:15,252 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-08-26 16:28:15,252 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505188841] [2023-08-26 16:28:15,252 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:28:15,252 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-08-26 16:28:15,252 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:28:15,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-08-26 16:28:15,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2023-08-26 16:28:15,257 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 648 out of 1849 [2023-08-26 16:28:15,260 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 96 places, 105 transitions, 327 flow. Second operand has 6 states, 6 states have (on average 649.3333333333334) internal successors, (3896), 6 states have internal predecessors, (3896), 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 16:28:15,260 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:28:15,260 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 648 of 1849 [2023-08-26 16:28:15,260 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:28:21,180 INFO L124 PetriNetUnfolderBase]: 45502/61444 cut-off events. [2023-08-26 16:28:21,180 INFO L125 PetriNetUnfolderBase]: For 171/171 co-relation queries the response was YES. [2023-08-26 16:28:21,255 INFO L83 FinitePrefix]: Finished finitePrefix Result has 123453 conditions, 61444 events. 45502/61444 cut-off events. For 171/171 co-relation queries the response was YES. Maximal size of possible extension queue 2751. Compared 362540 event pairs, 37481 based on Foata normal form. 0/21531 useless extension candidates. Maximal degree in co-relation 123443. Up to 61444 conditions per place. [2023-08-26 16:28:21,427 INFO L140 encePairwiseOnDemand]: 1846/1849 looper letters, 102 selfloop transitions, 1 changer transitions 0/103 dead transitions. [2023-08-26 16:28:21,427 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 96 places, 103 transitions, 524 flow [2023-08-26 16:28:21,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 16:28:21,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 16:28:21,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 2034 transitions. [2023-08-26 16:28:21,432 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3666846944294213 [2023-08-26 16:28:21,433 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 2034 transitions. [2023-08-26 16:28:21,433 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 2034 transitions. [2023-08-26 16:28:21,434 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:28:21,434 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 2034 transitions. [2023-08-26 16:28:21,437 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 678.0) internal successors, (2034), 3 states have internal predecessors, (2034), 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 16:28:21,446 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 1849.0) internal successors, (7396), 4 states have internal predecessors, (7396), 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 16:28:21,447 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 1849.0) internal successors, (7396), 4 states have internal predecessors, (7396), 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 16:28:21,447 INFO L175 Difference]: Start difference. First operand has 96 places, 105 transitions, 327 flow. Second operand 3 states and 2034 transitions. [2023-08-26 16:28:21,448 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 96 places, 103 transitions, 524 flow [2023-08-26 16:28:21,449 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 92 places, 103 transitions, 494 flow, removed 3 selfloop flow, removed 4 redundant places. [2023-08-26 16:28:21,450 INFO L231 Difference]: Finished difference. Result has 92 places, 103 transitions, 290 flow [2023-08-26 16:28:21,450 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=288, PETRI_DIFFERENCE_MINUEND_PLACES=90, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=103, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=102, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=290, PETRI_PLACES=92, PETRI_TRANSITIONS=103} [2023-08-26 16:28:21,453 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -20 predicate places. [2023-08-26 16:28:21,453 INFO L495 AbstractCegarLoop]: Abstraction has has 92 places, 103 transitions, 290 flow [2023-08-26 16:28:21,454 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 649.3333333333334) internal successors, (3896), 6 states have internal predecessors, (3896), 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 16:28:21,455 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:28:21,455 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 1, 1, 1, 1] [2023-08-26 16:28:21,455 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 16:28:21,455 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:28:21,455 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:28:21,455 INFO L85 PathProgramCache]: Analyzing trace with hash -2032926299, now seen corresponding path program 2 times [2023-08-26 16:28:21,455 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:28:21,455 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899636962] [2023-08-26 16:28:21,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:28:21,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:28:21,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:28:21,916 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-08-26 16:28:21,916 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:28:21,916 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899636962] [2023-08-26 16:28:21,916 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [899636962] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:28:21,916 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:28:21,916 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 16:28:21,916 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294425124] [2023-08-26 16:28:21,917 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:28:21,917 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 16:28:21,917 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:28:21,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 16:28:21,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-26 16:28:21,919 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 651 out of 1849 [2023-08-26 16:28:21,921 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 92 places, 103 transitions, 290 flow. Second operand has 4 states, 4 states have (on average 652.75) internal successors, (2611), 4 states have internal predecessors, (2611), 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 16:28:21,921 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:28:21,921 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 651 of 1849 [2023-08-26 16:28:21,921 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:28:25,835 INFO L124 PetriNetUnfolderBase]: 30960/42545 cut-off events. [2023-08-26 16:28:25,835 INFO L125 PetriNetUnfolderBase]: For 174/174 co-relation queries the response was YES. [2023-08-26 16:28:25,902 INFO L83 FinitePrefix]: Finished finitePrefix Result has 85640 conditions, 42545 events. 30960/42545 cut-off events. For 174/174 co-relation queries the response was YES. Maximal size of possible extension queue 1988. Compared 250475 event pairs, 25293 based on Foata normal form. 0/16999 useless extension candidates. Maximal degree in co-relation 85629. Up to 42545 conditions per place. [2023-08-26 16:28:26,013 INFO L140 encePairwiseOnDemand]: 1846/1849 looper letters, 100 selfloop transitions, 1 changer transitions 0/101 dead transitions. [2023-08-26 16:28:26,014 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 92 places, 101 transitions, 483 flow [2023-08-26 16:28:26,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 16:28:26,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 16:28:26,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 2041 transitions. [2023-08-26 16:28:26,018 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.36794663782224624 [2023-08-26 16:28:26,018 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 2041 transitions. [2023-08-26 16:28:26,018 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 2041 transitions. [2023-08-26 16:28:26,019 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:28:26,019 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 2041 transitions. [2023-08-26 16:28:26,022 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 680.3333333333334) internal successors, (2041), 3 states have internal predecessors, (2041), 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 16:28:26,028 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 1849.0) internal successors, (7396), 4 states have internal predecessors, (7396), 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 16:28:26,029 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 1849.0) internal successors, (7396), 4 states have internal predecessors, (7396), 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 16:28:26,029 INFO L175 Difference]: Start difference. First operand has 92 places, 103 transitions, 290 flow. Second operand 3 states and 2041 transitions. [2023-08-26 16:28:26,029 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 92 places, 101 transitions, 483 flow [2023-08-26 16:28:26,030 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 91 places, 101 transitions, 482 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 16:28:26,031 INFO L231 Difference]: Finished difference. Result has 91 places, 101 transitions, 282 flow [2023-08-26 16:28:26,031 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=280, PETRI_DIFFERENCE_MINUEND_PLACES=89, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=101, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=100, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=282, PETRI_PLACES=91, PETRI_TRANSITIONS=101} [2023-08-26 16:28:26,032 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -21 predicate places. [2023-08-26 16:28:26,032 INFO L495 AbstractCegarLoop]: Abstraction has has 91 places, 101 transitions, 282 flow [2023-08-26 16:28:26,033 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 652.75) internal successors, (2611), 4 states have internal predecessors, (2611), 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 16:28:26,033 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:28:26,033 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1] [2023-08-26 16:28:26,033 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-08-26 16:28:26,033 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:28:26,033 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:28:26,033 INFO L85 PathProgramCache]: Analyzing trace with hash 568021899, now seen corresponding path program 1 times [2023-08-26 16:28:26,033 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:28:26,034 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1247903913] [2023-08-26 16:28:26,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:28:26,034 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:28:26,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:28:26,868 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:28:26,870 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:28:26,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1247903913] [2023-08-26 16:28:26,872 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1247903913] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:28:26,872 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1696603145] [2023-08-26 16:28:26,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:28:26,872 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:28:26,872 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:28:26,877 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 16:28:26,879 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-08-26 16:28:27,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:28:27,056 INFO L262 TraceCheckSpWp]: Trace formula consists of 367 conjuncts, 13 conjunts are in the unsatisfiable core [2023-08-26 16:28:27,059 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:28:27,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-08-26 16:28:27,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-08-26 16:28:27,113 INFO L322 Elim1Store]: treesize reduction 49, result has 33.8 percent of original size [2023-08-26 16:28:27,113 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 35 [2023-08-26 16:28:27,129 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 98 treesize of output 94 [2023-08-26 16:28:27,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-08-26 16:28:27,188 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2023-08-26 16:28:27,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-08-26 16:28:27,233 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2023-08-26 16:28:27,257 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-08-26 16:28:27,257 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-08-26 16:28:27,257 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1696603145] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:28:27,257 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-08-26 16:28:27,257 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [9] total 10 [2023-08-26 16:28:27,258 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699814927] [2023-08-26 16:28:27,258 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:28:27,258 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 16:28:27,258 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:28:27,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 16:28:27,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2023-08-26 16:28:27,261 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 663 out of 1849 [2023-08-26 16:28:27,263 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 91 places, 101 transitions, 282 flow. Second operand has 4 states, 4 states have (on average 665.25) internal successors, (2661), 4 states have internal predecessors, (2661), 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 16:28:27,263 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:28:27,263 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 663 of 1849 [2023-08-26 16:28:27,263 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:28:31,291 INFO L124 PetriNetUnfolderBase]: 30491/41856 cut-off events. [2023-08-26 16:28:31,291 INFO L125 PetriNetUnfolderBase]: For 174/174 co-relation queries the response was YES. [2023-08-26 16:28:31,360 INFO L83 FinitePrefix]: Finished finitePrefix Result has 84263 conditions, 41856 events. 30491/41856 cut-off events. For 174/174 co-relation queries the response was YES. Maximal size of possible extension queue 1850. Compared 244532 event pairs, 24907 based on Foata normal form. 0/16865 useless extension candidates. Maximal degree in co-relation 84251. Up to 41856 conditions per place. [2023-08-26 16:28:31,455 INFO L140 encePairwiseOnDemand]: 1846/1849 looper letters, 98 selfloop transitions, 1 changer transitions 0/99 dead transitions. [2023-08-26 16:28:31,455 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 91 places, 99 transitions, 476 flow [2023-08-26 16:28:31,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 16:28:31,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 16:28:31,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 2075 transitions. [2023-08-26 16:28:31,460 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.37407607715882457 [2023-08-26 16:28:31,460 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 2075 transitions. [2023-08-26 16:28:31,460 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 2075 transitions. [2023-08-26 16:28:31,461 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:28:31,461 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 2075 transitions. [2023-08-26 16:28:31,464 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 691.6666666666666) internal successors, (2075), 3 states have internal predecessors, (2075), 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 16:28:31,470 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 1849.0) internal successors, (7396), 4 states have internal predecessors, (7396), 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 16:28:31,471 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 1849.0) internal successors, (7396), 4 states have internal predecessors, (7396), 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 16:28:31,471 INFO L175 Difference]: Start difference. First operand has 91 places, 101 transitions, 282 flow. Second operand 3 states and 2075 transitions. [2023-08-26 16:28:31,471 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 91 places, 99 transitions, 476 flow [2023-08-26 16:28:31,472 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 90 places, 99 transitions, 475 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 16:28:31,473 INFO L231 Difference]: Finished difference. Result has 90 places, 99 transitions, 279 flow [2023-08-26 16:28:31,473 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=277, PETRI_DIFFERENCE_MINUEND_PLACES=88, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=99, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=98, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=279, PETRI_PLACES=90, PETRI_TRANSITIONS=99} [2023-08-26 16:28:31,474 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -22 predicate places. [2023-08-26 16:28:31,474 INFO L495 AbstractCegarLoop]: Abstraction has has 90 places, 99 transitions, 279 flow [2023-08-26 16:28:31,475 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 665.25) internal successors, (2661), 4 states have internal predecessors, (2661), 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 16:28:31,475 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:28:31,475 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1] [2023-08-26 16:28:31,481 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-08-26 16:28:31,680 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:28:31,680 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:28:31,680 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:28:31,681 INFO L85 PathProgramCache]: Analyzing trace with hash 568021898, now seen corresponding path program 1 times [2023-08-26 16:28:31,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:28:31,681 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [596857317] [2023-08-26 16:28:31,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:28:31,681 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:28:31,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:28:31,926 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-08-26 16:28:31,927 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:28:31,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [596857317] [2023-08-26 16:28:31,927 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [596857317] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:28:31,927 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:28:31,927 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-08-26 16:28:31,927 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891953383] [2023-08-26 16:28:31,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:28:31,927 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-08-26 16:28:31,928 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:28:31,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-08-26 16:28:31,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2023-08-26 16:28:31,930 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 648 out of 1849 [2023-08-26 16:28:31,933 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 90 places, 99 transitions, 279 flow. Second operand has 6 states, 6 states have (on average 649.6666666666666) internal successors, (3898), 6 states have internal predecessors, (3898), 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 16:28:31,933 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:28:31,933 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 648 of 1849 [2023-08-26 16:28:31,933 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:28:35,737 INFO L124 PetriNetUnfolderBase]: 30022/41167 cut-off events. [2023-08-26 16:28:35,737 INFO L125 PetriNetUnfolderBase]: For 174/174 co-relation queries the response was YES. [2023-08-26 16:28:35,808 INFO L83 FinitePrefix]: Finished finitePrefix Result has 82886 conditions, 41167 events. 30022/41167 cut-off events. For 174/174 co-relation queries the response was YES. Maximal size of possible extension queue 1888. Compared 240297 event pairs, 24521 based on Foata normal form. 0/16731 useless extension candidates. Maximal degree in co-relation 82873. Up to 41167 conditions per place. [2023-08-26 16:28:35,909 INFO L140 encePairwiseOnDemand]: 1846/1849 looper letters, 96 selfloop transitions, 1 changer transitions 0/97 dead transitions. [2023-08-26 16:28:35,909 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 90 places, 97 transitions, 469 flow [2023-08-26 16:28:35,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 16:28:35,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 16:28:35,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 2028 transitions. [2023-08-26 16:28:35,913 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3656030286641428 [2023-08-26 16:28:35,913 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 2028 transitions. [2023-08-26 16:28:35,913 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 2028 transitions. [2023-08-26 16:28:35,914 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:28:35,914 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 2028 transitions. [2023-08-26 16:28:35,917 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 676.0) internal successors, (2028), 3 states have internal predecessors, (2028), 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 16:28:35,922 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 1849.0) internal successors, (7396), 4 states have internal predecessors, (7396), 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 16:28:35,923 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 1849.0) internal successors, (7396), 4 states have internal predecessors, (7396), 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 16:28:35,923 INFO L175 Difference]: Start difference. First operand has 90 places, 99 transitions, 279 flow. Second operand 3 states and 2028 transitions. [2023-08-26 16:28:35,923 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 90 places, 97 transitions, 469 flow [2023-08-26 16:28:35,924 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 89 places, 97 transitions, 468 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 16:28:35,925 INFO L231 Difference]: Finished difference. Result has 89 places, 97 transitions, 276 flow [2023-08-26 16:28:35,925 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=274, PETRI_DIFFERENCE_MINUEND_PLACES=87, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=97, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=96, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=276, PETRI_PLACES=89, PETRI_TRANSITIONS=97} [2023-08-26 16:28:35,926 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -23 predicate places. [2023-08-26 16:28:35,926 INFO L495 AbstractCegarLoop]: Abstraction has has 89 places, 97 transitions, 276 flow [2023-08-26 16:28:35,927 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 649.6666666666666) internal successors, (3898), 6 states have internal predecessors, (3898), 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 16:28:35,927 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:28:35,927 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 16:28:35,927 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 16:28:35,927 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:28:35,928 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:28:35,928 INFO L85 PathProgramCache]: Analyzing trace with hash 428819723, now seen corresponding path program 1 times [2023-08-26 16:28:35,928 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:28:35,928 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1392921341] [2023-08-26 16:28:35,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:28:35,928 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:28:35,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:28:36,686 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:28:36,686 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:28:36,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1392921341] [2023-08-26 16:28:36,686 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1392921341] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:28:36,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [890731655] [2023-08-26 16:28:36,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:28:36,687 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:28:36,687 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:28:36,688 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 16:28:36,691 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-08-26 16:28:36,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:28:36,880 INFO L262 TraceCheckSpWp]: Trace formula consists of 379 conjuncts, 24 conjunts are in the unsatisfiable core [2023-08-26 16:28:36,883 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:28:36,927 INFO L322 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2023-08-26 16:28:36,928 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 3 case distinctions, treesize of input 15 treesize of output 42 [2023-08-26 16:28:37,094 INFO L322 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-08-26 16:28:37,095 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2023-08-26 16:28:37,103 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-08-26 16:28:37,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-08-26 16:28:37,156 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-08-26 16:28:37,164 INFO L322 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-08-26 16:28:37,165 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-08-26 16:28:37,220 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:28:37,220 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:28:43,358 WARN L234 SmtUtils]: Spent 6.01s on a formula simplification that was a NOOP. DAG size: 22 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-08-26 16:28:45,476 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 96 treesize of output 92 [2023-08-26 16:28:45,926 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:28:45,927 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [890731655] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:28:45,927 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:28:45,927 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 27 [2023-08-26 16:28:45,927 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488915735] [2023-08-26 16:28:45,927 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:28:45,928 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-08-26 16:28:45,928 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:28:45,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-08-26 16:28:45,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=666, Unknown=0, NotChecked=0, Total=812 [2023-08-26 16:28:45,937 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 588 out of 1849 [2023-08-26 16:28:45,947 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 89 places, 97 transitions, 276 flow. Second operand has 29 states, 29 states have (on average 589.448275862069) internal successors, (17094), 29 states have internal predecessors, (17094), 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 16:28:45,948 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:28:45,948 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 588 of 1849 [2023-08-26 16:28:45,948 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:28:52,868 INFO L124 PetriNetUnfolderBase]: 44660/60865 cut-off events. [2023-08-26 16:28:52,869 INFO L125 PetriNetUnfolderBase]: For 152/152 co-relation queries the response was YES. [2023-08-26 16:28:52,987 INFO L83 FinitePrefix]: Finished finitePrefix Result has 122559 conditions, 60865 events. 44660/60865 cut-off events. For 152/152 co-relation queries the response was YES. Maximal size of possible extension queue 1305. Compared 356653 event pairs, 4207 based on Foata normal form. 0/26469 useless extension candidates. Maximal degree in co-relation 122545. Up to 27488 conditions per place. [2023-08-26 16:28:53,130 INFO L140 encePairwiseOnDemand]: 1829/1849 looper letters, 187 selfloop transitions, 23 changer transitions 0/210 dead transitions. [2023-08-26 16:28:53,130 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 97 places, 210 transitions, 932 flow [2023-08-26 16:28:53,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-08-26 16:28:53,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2023-08-26 16:28:53,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 9043 transitions. [2023-08-26 16:28:53,145 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3260501171804579 [2023-08-26 16:28:53,145 INFO L72 ComplementDD]: Start complementDD. Operand 15 states and 9043 transitions. [2023-08-26 16:28:53,145 INFO L73 IsDeterministic]: Start isDeterministic. Operand 15 states and 9043 transitions. [2023-08-26 16:28:53,149 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:28:53,149 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 15 states and 9043 transitions. [2023-08-26 16:28:53,159 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 16 states, 15 states have (on average 602.8666666666667) internal successors, (9043), 15 states have internal predecessors, (9043), 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 16:28:53,180 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 16 states, 16 states have (on average 1849.0) internal successors, (29584), 16 states have internal predecessors, (29584), 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 16:28:53,183 INFO L81 ComplementDD]: Finished complementDD. Result has 16 states, 16 states have (on average 1849.0) internal successors, (29584), 16 states have internal predecessors, (29584), 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 16:28:53,183 INFO L175 Difference]: Start difference. First operand has 89 places, 97 transitions, 276 flow. Second operand 15 states and 9043 transitions. [2023-08-26 16:28:53,183 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 97 places, 210 transitions, 932 flow [2023-08-26 16:28:53,185 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 96 places, 210 transitions, 931 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 16:28:53,187 INFO L231 Difference]: Finished difference. Result has 99 places, 96 transitions, 346 flow [2023-08-26 16:28:53,187 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=263, PETRI_DIFFERENCE_MINUEND_PLACES=82, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=91, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=18, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=69, PETRI_DIFFERENCE_SUBTRAHEND_STATES=15, PETRI_FLOW=346, PETRI_PLACES=99, PETRI_TRANSITIONS=96} [2023-08-26 16:28:53,188 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -13 predicate places. [2023-08-26 16:28:53,188 INFO L495 AbstractCegarLoop]: Abstraction has has 99 places, 96 transitions, 346 flow [2023-08-26 16:28:53,191 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 589.448275862069) internal successors, (17094), 29 states have internal predecessors, (17094), 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 16:28:53,191 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:28:53,191 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 16:28:53,199 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-08-26 16:28:53,396 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-08-26 16:28:53,397 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting thread1Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:28:53,397 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:28:53,397 INFO L85 PathProgramCache]: Analyzing trace with hash 428819725, now seen corresponding path program 1 times [2023-08-26 16:28:53,397 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:28:53,397 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1062258163] [2023-08-26 16:28:53,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:28:53,397 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:28:53,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:28:53,742 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:28:53,742 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:28:53,743 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1062258163] [2023-08-26 16:28:53,744 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1062258163] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:28:53,744 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1106856383] [2023-08-26 16:28:53,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:28:53,744 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:28:53,744 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:28:53,745 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 16:28:53,771 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-08-26 16:28:53,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:28:53,939 INFO L262 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 20 conjunts are in the unsatisfiable core [2023-08-26 16:28:53,942 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:28:53,954 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 16:28:54,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-08-26 16:28:54,061 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-08-26 16:28:54,068 INFO L322 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-08-26 16:28:54,068 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-08-26 16:28:54,125 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:28:54,126 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:29:00,219 WARN L234 SmtUtils]: Spent 6.01s on a formula simplification that was a NOOP. DAG size: 22 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-08-26 16:29:00,228 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 44 [2023-08-26 16:29:00,447 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:29:00,447 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1106856383] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:29:00,447 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:29:00,448 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 25 [2023-08-26 16:29:00,448 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154495999] [2023-08-26 16:29:00,448 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:29:00,448 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-08-26 16:29:00,448 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:29:00,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-08-26 16:29:00,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=502, Unknown=0, NotChecked=0, Total=650 [2023-08-26 16:29:00,457 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 594 out of 1849 [2023-08-26 16:29:00,465 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 99 places, 96 transitions, 346 flow. Second operand has 26 states, 26 states have (on average 595.4615384615385) internal successors, (15482), 26 states have internal predecessors, (15482), 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 16:29:00,465 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:29:00,465 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 594 of 1849 [2023-08-26 16:29:00,465 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:29:08,299 INFO L124 PetriNetUnfolderBase]: 51910/71209 cut-off events. [2023-08-26 16:29:08,300 INFO L125 PetriNetUnfolderBase]: For 5457/5457 co-relation queries the response was YES. [2023-08-26 16:29:08,502 INFO L83 FinitePrefix]: Finished finitePrefix Result has 154035 conditions, 71209 events. 51910/71209 cut-off events. For 5457/5457 co-relation queries the response was YES. Maximal size of possible extension queue 1113. Compared 416039 event pairs, 17129 based on Foata normal form. 0/35203 useless extension candidates. Maximal degree in co-relation 154017. Up to 28930 conditions per place. [2023-08-26 16:29:08,694 INFO L140 encePairwiseOnDemand]: 1836/1849 looper letters, 195 selfloop transitions, 20 changer transitions 0/215 dead transitions. [2023-08-26 16:29:08,694 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 113 places, 215 transitions, 1032 flow [2023-08-26 16:29:08,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-08-26 16:29:08,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2023-08-26 16:29:08,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 9128 transitions. [2023-08-26 16:29:08,919 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3291148368487471 [2023-08-26 16:29:08,919 INFO L72 ComplementDD]: Start complementDD. Operand 15 states and 9128 transitions. [2023-08-26 16:29:08,919 INFO L73 IsDeterministic]: Start isDeterministic. Operand 15 states and 9128 transitions. [2023-08-26 16:29:08,922 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:29:08,923 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 15 states and 9128 transitions. [2023-08-26 16:29:08,931 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 16 states, 15 states have (on average 608.5333333333333) internal successors, (9128), 15 states have internal predecessors, (9128), 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 16:29:08,951 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 16 states, 16 states have (on average 1849.0) internal successors, (29584), 16 states have internal predecessors, (29584), 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 16:29:08,953 INFO L81 ComplementDD]: Finished complementDD. Result has 16 states, 16 states have (on average 1849.0) internal successors, (29584), 16 states have internal predecessors, (29584), 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 16:29:08,954 INFO L175 Difference]: Start difference. First operand has 99 places, 96 transitions, 346 flow. Second operand 15 states and 9128 transitions. [2023-08-26 16:29:08,954 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 113 places, 215 transitions, 1032 flow [2023-08-26 16:29:09,009 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 107 places, 215 transitions, 993 flow, removed 4 selfloop flow, removed 6 redundant places. [2023-08-26 16:29:09,011 INFO L231 Difference]: Finished difference. Result has 110 places, 97 transitions, 372 flow [2023-08-26 16:29:09,011 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=303, PETRI_DIFFERENCE_MINUEND_PLACES=93, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=95, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=18, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=75, PETRI_DIFFERENCE_SUBTRAHEND_STATES=15, PETRI_FLOW=372, PETRI_PLACES=110, PETRI_TRANSITIONS=97} [2023-08-26 16:29:09,012 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -2 predicate places. [2023-08-26 16:29:09,012 INFO L495 AbstractCegarLoop]: Abstraction has has 110 places, 97 transitions, 372 flow [2023-08-26 16:29:09,014 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 595.4615384615385) internal successors, (15482), 26 states have internal predecessors, (15482), 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 16:29:09,014 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:29:09,014 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 16:29:09,019 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-08-26 16:29:09,215 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:29:09,216 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:29:09,216 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:29:09,216 INFO L85 PathProgramCache]: Analyzing trace with hash 428819724, now seen corresponding path program 1 times [2023-08-26 16:29:09,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:29:09,216 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864050398] [2023-08-26 16:29:09,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:29:09,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:29:09,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:29:09,335 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-08-26 16:29:09,336 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:29:09,336 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864050398] [2023-08-26 16:29:09,336 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1864050398] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:29:09,336 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:29:09,336 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-08-26 16:29:09,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176510130] [2023-08-26 16:29:09,336 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:29:09,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-08-26 16:29:09,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:29:09,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-08-26 16:29:09,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-08-26 16:29:09,339 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 643 out of 1849 [2023-08-26 16:29:09,341 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 110 places, 97 transitions, 372 flow. Second operand has 5 states, 5 states have (on average 645.4) internal successors, (3227), 5 states have internal predecessors, (3227), 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 16:29:09,341 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:29:09,341 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 643 of 1849 [2023-08-26 16:29:09,341 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:29:14,727 INFO L124 PetriNetUnfolderBase]: 36106/49363 cut-off events. [2023-08-26 16:29:14,727 INFO L125 PetriNetUnfolderBase]: For 12173/12173 co-relation queries the response was YES. [2023-08-26 16:29:14,873 INFO L83 FinitePrefix]: Finished finitePrefix Result has 112802 conditions, 49363 events. 36106/49363 cut-off events. For 12173/12173 co-relation queries the response was YES. Maximal size of possible extension queue 835. Compared 275061 event pairs, 28757 based on Foata normal form. 0/28233 useless extension candidates. Maximal degree in co-relation 112781. Up to 49349 conditions per place. [2023-08-26 16:29:15,002 INFO L140 encePairwiseOnDemand]: 1841/1849 looper letters, 88 selfloop transitions, 2 changer transitions 0/90 dead transitions. [2023-08-26 16:29:15,002 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 107 places, 90 transitions, 532 flow [2023-08-26 16:29:15,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 16:29:15,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 16:29:15,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 2648 transitions. [2023-08-26 16:29:15,008 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.35803136830719307 [2023-08-26 16:29:15,008 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 2648 transitions. [2023-08-26 16:29:15,008 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 2648 transitions. [2023-08-26 16:29:15,009 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:29:15,009 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 2648 transitions. [2023-08-26 16:29:15,012 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 662.0) internal successors, (2648), 4 states have internal predecessors, (2648), 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 16:29:15,017 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 1849.0) internal successors, (9245), 5 states have internal predecessors, (9245), 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 16:29:15,017 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 1849.0) internal successors, (9245), 5 states have internal predecessors, (9245), 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 16:29:15,018 INFO L175 Difference]: Start difference. First operand has 110 places, 97 transitions, 372 flow. Second operand 4 states and 2648 transitions. [2023-08-26 16:29:15,018 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 107 places, 90 transitions, 532 flow [2023-08-26 16:29:15,064 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 105 places, 90 transitions, 521 flow, removed 4 selfloop flow, removed 2 redundant places. [2023-08-26 16:29:15,065 INFO L231 Difference]: Finished difference. Result has 105 places, 90 transitions, 345 flow [2023-08-26 16:29:15,065 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=341, PETRI_DIFFERENCE_MINUEND_PLACES=102, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=90, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=88, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=345, PETRI_PLACES=105, PETRI_TRANSITIONS=90} [2023-08-26 16:29:15,065 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -7 predicate places. [2023-08-26 16:29:15,065 INFO L495 AbstractCegarLoop]: Abstraction has has 105 places, 90 transitions, 345 flow [2023-08-26 16:29:15,066 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 645.4) internal successors, (3227), 5 states have internal predecessors, (3227), 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 16:29:15,066 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:29:15,066 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 16:29:15,066 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-26 16:29:15,066 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:29:15,066 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:29:15,067 INFO L85 PathProgramCache]: Analyzing trace with hash 408273755, now seen corresponding path program 1 times [2023-08-26 16:29:15,067 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:29:15,067 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [937948245] [2023-08-26 16:29:15,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:29:15,067 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:29:15,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:29:15,638 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:29:15,639 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:29:15,639 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [937948245] [2023-08-26 16:29:15,639 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [937948245] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:29:15,639 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [673021287] [2023-08-26 16:29:15,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:29:15,639 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:29:15,639 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:29:15,650 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 16:29:15,653 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-08-26 16:29:15,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:29:15,859 INFO L262 TraceCheckSpWp]: Trace formula consists of 385 conjuncts, 11 conjunts are in the unsatisfiable core [2023-08-26 16:29:15,862 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:29:15,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-08-26 16:29:15,900 INFO L322 Elim1Store]: treesize reduction 62, result has 31.1 percent of original size [2023-08-26 16:29:15,900 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 15 treesize of output 38 [2023-08-26 16:29:15,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-08-26 16:29:15,951 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2023-08-26 16:29:15,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-08-26 16:29:15,986 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 14 [2023-08-26 16:29:16,010 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-08-26 16:29:16,010 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-08-26 16:29:16,010 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [673021287] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:29:16,011 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-08-26 16:29:16,011 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [8] total 9 [2023-08-26 16:29:16,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99016985] [2023-08-26 16:29:16,011 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:29:16,012 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 16:29:16,012 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:29:16,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 16:29:16,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=60, Unknown=0, NotChecked=0, Total=110 [2023-08-26 16:29:16,014 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 663 out of 1849 [2023-08-26 16:29:16,016 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 105 places, 90 transitions, 345 flow. Second operand has 4 states, 4 states have (on average 665.75) internal successors, (2663), 4 states have internal predecessors, (2663), 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 16:29:16,016 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:29:16,016 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 663 of 1849 [2023-08-26 16:29:16,016 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:29:21,540 INFO L124 PetriNetUnfolderBase]: 34691/47316 cut-off events. [2023-08-26 16:29:21,540 INFO L125 PetriNetUnfolderBase]: For 10419/10419 co-relation queries the response was YES. [2023-08-26 16:29:21,697 INFO L83 FinitePrefix]: Finished finitePrefix Result has 107678 conditions, 47316 events. 34691/47316 cut-off events. For 10419/10419 co-relation queries the response was YES. Maximal size of possible extension queue 806. Compared 260910 event pairs, 27571 based on Foata normal form. 0/27331 useless extension candidates. Maximal degree in co-relation 107656. Up to 47316 conditions per place. [2023-08-26 16:29:21,819 INFO L140 encePairwiseOnDemand]: 1846/1849 looper letters, 87 selfloop transitions, 1 changer transitions 0/88 dead transitions. [2023-08-26 16:29:21,819 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 105 places, 88 transitions, 517 flow [2023-08-26 16:29:21,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 16:29:21,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 16:29:21,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 2059 transitions. [2023-08-26 16:29:21,823 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.37119163511808184 [2023-08-26 16:29:21,823 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 2059 transitions. [2023-08-26 16:29:21,823 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 2059 transitions. [2023-08-26 16:29:21,824 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:29:21,824 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 2059 transitions. [2023-08-26 16:29:21,826 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 686.3333333333334) internal successors, (2059), 3 states have internal predecessors, (2059), 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 16:29:21,829 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 1849.0) internal successors, (7396), 4 states have internal predecessors, (7396), 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 16:29:21,830 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 1849.0) internal successors, (7396), 4 states have internal predecessors, (7396), 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 16:29:21,830 INFO L175 Difference]: Start difference. First operand has 105 places, 90 transitions, 345 flow. Second operand 3 states and 2059 transitions. [2023-08-26 16:29:21,830 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 105 places, 88 transitions, 517 flow [2023-08-26 16:29:21,878 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 103 places, 88 transitions, 514 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 16:29:21,879 INFO L231 Difference]: Finished difference. Result has 103 places, 88 transitions, 340 flow [2023-08-26 16:29:21,879 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=338, PETRI_DIFFERENCE_MINUEND_PLACES=101, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=88, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=87, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=340, PETRI_PLACES=103, PETRI_TRANSITIONS=88} [2023-08-26 16:29:21,879 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -9 predicate places. [2023-08-26 16:29:21,880 INFO L495 AbstractCegarLoop]: Abstraction has has 103 places, 88 transitions, 340 flow [2023-08-26 16:29:21,880 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 665.75) internal successors, (2663), 4 states have internal predecessors, (2663), 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 16:29:21,880 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:29:21,880 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 16:29:21,885 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-08-26 16:29:22,081 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:29:22,081 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:29:22,082 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:29:22,082 INFO L85 PathProgramCache]: Analyzing trace with hash 408273756, now seen corresponding path program 1 times [2023-08-26 16:29:22,082 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:29:22,082 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574105161] [2023-08-26 16:29:22,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:29:22,082 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:29:22,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:29:22,330 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-08-26 16:29:22,330 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:29:22,330 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574105161] [2023-08-26 16:29:22,330 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1574105161] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:29:22,330 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:29:22,330 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-08-26 16:29:22,330 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212938258] [2023-08-26 16:29:22,330 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:29:22,331 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-08-26 16:29:22,331 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:29:22,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-08-26 16:29:22,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2023-08-26 16:29:22,334 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 648 out of 1849 [2023-08-26 16:29:22,336 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 103 places, 88 transitions, 340 flow. Second operand has 6 states, 6 states have (on average 650.0) internal successors, (3900), 6 states have internal predecessors, (3900), 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 16:29:22,336 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:29:22,336 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 648 of 1849 [2023-08-26 16:29:22,336 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:29:27,638 INFO L124 PetriNetUnfolderBase]: 33276/45269 cut-off events. [2023-08-26 16:29:27,638 INFO L125 PetriNetUnfolderBase]: For 9885/9885 co-relation queries the response was YES. [2023-08-26 16:29:27,772 INFO L83 FinitePrefix]: Finished finitePrefix Result has 102938 conditions, 45269 events. 33276/45269 cut-off events. For 9885/9885 co-relation queries the response was YES. Maximal size of possible extension queue 769. Compared 246169 event pairs, 26385 based on Foata normal form. 0/26429 useless extension candidates. Maximal degree in co-relation 102916. Up to 45269 conditions per place. [2023-08-26 16:29:27,884 INFO L140 encePairwiseOnDemand]: 1846/1849 looper letters, 85 selfloop transitions, 1 changer transitions 0/86 dead transitions. [2023-08-26 16:29:27,884 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 103 places, 86 transitions, 508 flow [2023-08-26 16:29:27,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 16:29:27,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 16:29:27,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 2012 transitions. [2023-08-26 16:29:27,887 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.36271858662340006 [2023-08-26 16:29:27,887 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 2012 transitions. [2023-08-26 16:29:27,887 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 2012 transitions. [2023-08-26 16:29:27,887 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:29:27,887 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 2012 transitions. [2023-08-26 16:29:27,889 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 670.6666666666666) internal successors, (2012), 3 states have internal predecessors, (2012), 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 16:29:27,891 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 1849.0) internal successors, (7396), 4 states have internal predecessors, (7396), 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 16:29:27,892 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 1849.0) internal successors, (7396), 4 states have internal predecessors, (7396), 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 16:29:27,892 INFO L175 Difference]: Start difference. First operand has 103 places, 88 transitions, 340 flow. Second operand 3 states and 2012 transitions. [2023-08-26 16:29:27,892 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 103 places, 86 transitions, 508 flow [2023-08-26 16:29:27,936 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 102 places, 86 transitions, 507 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 16:29:27,937 INFO L231 Difference]: Finished difference. Result has 102 places, 86 transitions, 337 flow [2023-08-26 16:29:27,938 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=335, PETRI_DIFFERENCE_MINUEND_PLACES=100, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=86, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=85, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=337, PETRI_PLACES=102, PETRI_TRANSITIONS=86} [2023-08-26 16:29:27,938 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -10 predicate places. [2023-08-26 16:29:27,938 INFO L495 AbstractCegarLoop]: Abstraction has has 102 places, 86 transitions, 337 flow [2023-08-26 16:29:27,939 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 650.0) internal successors, (3900), 6 states have internal predecessors, (3900), 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 16:29:27,939 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:29:27,939 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 16:29:27,939 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-08-26 16:29:27,939 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting thread2Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:29:27,939 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:29:27,939 INFO L85 PathProgramCache]: Analyzing trace with hash -228406535, now seen corresponding path program 1 times [2023-08-26 16:29:27,940 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:29:27,940 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436107619] [2023-08-26 16:29:27,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:29:27,940 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:29:27,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:29:28,249 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:29:28,250 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:29:28,250 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436107619] [2023-08-26 16:29:28,250 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1436107619] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:29:28,250 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1273767527] [2023-08-26 16:29:28,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:29:28,250 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:29:28,250 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:29:28,251 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 16:29:28,255 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-08-26 16:29:28,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:29:28,466 INFO L262 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 19 conjunts are in the unsatisfiable core [2023-08-26 16:29:28,473 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:29:28,477 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 16:29:28,604 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:29:28,604 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:29:28,795 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:29:28,796 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1273767527] provided 1 perfect and 1 imperfect interpolant sequences [2023-08-26 16:29:28,796 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-08-26 16:29:28,796 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [9, 9] total 25 [2023-08-26 16:29:28,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891166666] [2023-08-26 16:29:28,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:29:28,796 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-08-26 16:29:28,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:29:28,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-08-26 16:29:28,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2023-08-26 16:29:28,801 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 620 out of 1849 [2023-08-26 16:29:28,804 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 102 places, 86 transitions, 337 flow. Second operand has 10 states, 10 states have (on average 621.6) internal successors, (6216), 10 states have internal predecessors, (6216), 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 16:29:28,804 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:29:28,804 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 620 of 1849 [2023-08-26 16:29:28,804 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:29:38,033 INFO L124 PetriNetUnfolderBase]: 59268/80675 cut-off events. [2023-08-26 16:29:38,033 INFO L125 PetriNetUnfolderBase]: For 26433/26433 co-relation queries the response was YES. [2023-08-26 16:29:38,298 INFO L83 FinitePrefix]: Finished finitePrefix Result has 183411 conditions, 80675 events. 59268/80675 cut-off events. For 26433/26433 co-relation queries the response was YES. Maximal size of possible extension queue 1184. Compared 465947 event pairs, 26385 based on Foata normal form. 0/47747 useless extension candidates. Maximal degree in co-relation 183388. Up to 44000 conditions per place. [2023-08-26 16:29:38,508 INFO L140 encePairwiseOnDemand]: 1840/1849 looper letters, 136 selfloop transitions, 6 changer transitions 0/142 dead transitions. [2023-08-26 16:29:38,509 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 106 places, 142 transitions, 799 flow [2023-08-26 16:29:38,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 16:29:38,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 16:29:38,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 3220 transitions. [2023-08-26 16:29:38,513 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3482963764196863 [2023-08-26 16:29:38,513 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 3220 transitions. [2023-08-26 16:29:38,513 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 3220 transitions. [2023-08-26 16:29:38,514 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:29:38,514 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 3220 transitions. [2023-08-26 16:29:38,517 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 644.0) internal successors, (3220), 5 states have internal predecessors, (3220), 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 16:29:38,523 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 1849.0) internal successors, (11094), 6 states have internal predecessors, (11094), 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 16:29:38,524 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 1849.0) internal successors, (11094), 6 states have internal predecessors, (11094), 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 16:29:38,524 INFO L175 Difference]: Start difference. First operand has 102 places, 86 transitions, 337 flow. Second operand 5 states and 3220 transitions. [2023-08-26 16:29:38,524 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 106 places, 142 transitions, 799 flow [2023-08-26 16:29:38,548 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 105 places, 142 transitions, 798 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 16:29:38,550 INFO L231 Difference]: Finished difference. Result has 107 places, 89 transitions, 375 flow [2023-08-26 16:29:38,550 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=336, PETRI_DIFFERENCE_MINUEND_PLACES=101, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=86, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=80, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=375, PETRI_PLACES=107, PETRI_TRANSITIONS=89} [2023-08-26 16:29:38,551 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -5 predicate places. [2023-08-26 16:29:38,551 INFO L495 AbstractCegarLoop]: Abstraction has has 107 places, 89 transitions, 375 flow [2023-08-26 16:29:38,552 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 621.6) internal successors, (6216), 10 states have internal predecessors, (6216), 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 16:29:38,552 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:29:38,552 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 16:29:38,560 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-08-26 16:29:38,757 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-08-26 16:29:38,758 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting thread2Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:29:38,758 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:29:38,758 INFO L85 PathProgramCache]: Analyzing trace with hash -228406536, now seen corresponding path program 1 times [2023-08-26 16:29:38,758 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:29:38,758 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [788297503] [2023-08-26 16:29:38,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:29:38,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:29:38,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:29:38,832 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-08-26 16:29:38,832 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:29:38,832 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [788297503] [2023-08-26 16:29:38,833 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [788297503] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 16:29:38,833 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 16:29:38,833 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-08-26 16:29:38,833 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223862410] [2023-08-26 16:29:38,833 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:29:38,833 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 16:29:38,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:29:38,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 16:29:38,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-08-26 16:29:38,835 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 643 out of 1849 [2023-08-26 16:29:38,837 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 107 places, 89 transitions, 375 flow. Second operand has 4 states, 4 states have (on average 646.25) internal successors, (2585), 4 states have internal predecessors, (2585), 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 16:29:38,837 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:29:38,837 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 643 of 1849 [2023-08-26 16:29:38,837 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:29:44,998 INFO L124 PetriNetUnfolderBase]: 38588/52307 cut-off events. [2023-08-26 16:29:44,998 INFO L125 PetriNetUnfolderBase]: For 18453/18453 co-relation queries the response was YES. [2023-08-26 16:29:45,183 INFO L83 FinitePrefix]: Finished finitePrefix Result has 125783 conditions, 52307 events. 38588/52307 cut-off events. For 18453/18453 co-relation queries the response was YES. Maximal size of possible extension queue 761. Compared 281125 event pairs, 29767 based on Foata normal form. 0/35063 useless extension candidates. Maximal degree in co-relation 125757. Up to 52286 conditions per place. [2023-08-26 16:29:45,326 INFO L140 encePairwiseOnDemand]: 1842/1849 looper letters, 82 selfloop transitions, 2 changer transitions 0/84 dead transitions. [2023-08-26 16:29:45,326 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 105 places, 84 transitions, 533 flow [2023-08-26 16:29:45,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 16:29:45,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 16:29:45,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 2638 transitions. [2023-08-26 16:29:45,330 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3566792861005949 [2023-08-26 16:29:45,330 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 2638 transitions. [2023-08-26 16:29:45,330 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 2638 transitions. [2023-08-26 16:29:45,331 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:29:45,331 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 2638 transitions. [2023-08-26 16:29:45,334 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 659.5) internal successors, (2638), 4 states have internal predecessors, (2638), 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 16:29:45,338 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 1849.0) internal successors, (9245), 5 states have internal predecessors, (9245), 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 16:29:45,339 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 1849.0) internal successors, (9245), 5 states have internal predecessors, (9245), 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 16:29:45,339 INFO L175 Difference]: Start difference. First operand has 107 places, 89 transitions, 375 flow. Second operand 4 states and 2638 transitions. [2023-08-26 16:29:45,339 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 105 places, 84 transitions, 533 flow [2023-08-26 16:29:45,374 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 103 places, 84 transitions, 530 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 16:29:45,375 INFO L231 Difference]: Finished difference. Result has 103 places, 84 transitions, 366 flow [2023-08-26 16:29:45,375 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=362, PETRI_DIFFERENCE_MINUEND_PLACES=100, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=84, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=82, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=366, PETRI_PLACES=103, PETRI_TRANSITIONS=84} [2023-08-26 16:29:45,375 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, -9 predicate places. [2023-08-26 16:29:45,376 INFO L495 AbstractCegarLoop]: Abstraction has has 103 places, 84 transitions, 366 flow [2023-08-26 16:29:45,376 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 646.25) internal successors, (2585), 4 states have internal predecessors, (2585), 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 16:29:45,376 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:29:45,376 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 16:29:45,376 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-08-26 16:29:45,377 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting thread2Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:29:45,377 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:29:45,377 INFO L85 PathProgramCache]: Analyzing trace with hash -228406538, now seen corresponding path program 1 times [2023-08-26 16:29:45,377 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:29:45,377 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [841555036] [2023-08-26 16:29:45,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:29:45,377 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:29:45,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:29:45,688 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:29:45,688 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:29:45,688 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [841555036] [2023-08-26 16:29:45,688 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [841555036] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:29:45,688 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2059392557] [2023-08-26 16:29:45,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:29:45,689 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:29:45,689 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:29:45,690 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 16:29:45,692 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-08-26 16:29:45,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:29:45,914 INFO L262 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 20 conjunts are in the unsatisfiable core [2023-08-26 16:29:45,916 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:29:45,922 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 16:29:46,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-08-26 16:29:46,029 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-08-26 16:29:46,037 INFO L322 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-08-26 16:29:46,038 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-08-26 16:29:46,098 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:29:46,098 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:29:52,192 WARN L234 SmtUtils]: Spent 6.01s on a formula simplification that was a NOOP. DAG size: 22 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-08-26 16:29:52,199 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 44 [2023-08-26 16:29:52,569 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:29:52,569 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2059392557] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:29:52,569 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:29:52,569 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 25 [2023-08-26 16:29:52,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699420791] [2023-08-26 16:29:52,569 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:29:52,570 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-08-26 16:29:52,572 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:29:52,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-08-26 16:29:52,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=502, Unknown=0, NotChecked=0, Total=650 [2023-08-26 16:29:52,578 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 594 out of 1849 [2023-08-26 16:29:52,583 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 103 places, 84 transitions, 366 flow. Second operand has 26 states, 26 states have (on average 595.6923076923077) internal successors, (15488), 26 states have internal predecessors, (15488), 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 16:29:52,583 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:29:52,583 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 594 of 1849 [2023-08-26 16:29:52,583 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:29:59,958 INFO L124 PetriNetUnfolderBase]: 43940/59153 cut-off events. [2023-08-26 16:29:59,958 INFO L125 PetriNetUnfolderBase]: For 25575/25575 co-relation queries the response was YES. [2023-08-26 16:30:00,181 INFO L83 FinitePrefix]: Finished finitePrefix Result has 142936 conditions, 59153 events. 43940/59153 cut-off events. For 25575/25575 co-relation queries the response was YES. Maximal size of possible extension queue 768. Compared 314536 event pairs, 3913 based on Foata normal form. 0/41629 useless extension candidates. Maximal degree in co-relation 142910. Up to 34364 conditions per place. [2023-08-26 16:30:00,346 INFO L140 encePairwiseOnDemand]: 1834/1849 looper letters, 147 selfloop transitions, 23 changer transitions 0/170 dead transitions. [2023-08-26 16:30:00,346 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 115 places, 170 transitions, 1018 flow [2023-08-26 16:30:00,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-08-26 16:30:00,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2023-08-26 16:30:00,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 9066 transitions. [2023-08-26 16:30:00,356 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.32687939426717144 [2023-08-26 16:30:00,356 INFO L72 ComplementDD]: Start complementDD. Operand 15 states and 9066 transitions. [2023-08-26 16:30:00,356 INFO L73 IsDeterministic]: Start isDeterministic. Operand 15 states and 9066 transitions. [2023-08-26 16:30:00,358 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:30:00,358 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 15 states and 9066 transitions. [2023-08-26 16:30:00,366 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 16 states, 15 states have (on average 604.4) internal successors, (9066), 15 states have internal predecessors, (9066), 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 16:30:00,383 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 16 states, 16 states have (on average 1849.0) internal successors, (29584), 16 states have internal predecessors, (29584), 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 16:30:00,385 INFO L81 ComplementDD]: Finished complementDD. Result has 16 states, 16 states have (on average 1849.0) internal successors, (29584), 16 states have internal predecessors, (29584), 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 16:30:00,385 INFO L175 Difference]: Start difference. First operand has 103 places, 84 transitions, 366 flow. Second operand 15 states and 9066 transitions. [2023-08-26 16:30:00,385 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 115 places, 170 transitions, 1018 flow [2023-08-26 16:30:00,397 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 113 places, 170 transitions, 1015 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 16:30:00,398 INFO L231 Difference]: Finished difference. Result has 116 places, 86 transitions, 444 flow [2023-08-26 16:30:00,398 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=359, PETRI_DIFFERENCE_MINUEND_PLACES=99, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=82, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=19, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=60, PETRI_DIFFERENCE_SUBTRAHEND_STATES=15, PETRI_FLOW=444, PETRI_PLACES=116, PETRI_TRANSITIONS=86} [2023-08-26 16:30:00,398 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, 4 predicate places. [2023-08-26 16:30:00,399 INFO L495 AbstractCegarLoop]: Abstraction has has 116 places, 86 transitions, 444 flow [2023-08-26 16:30:00,401 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 595.6923076923077) internal successors, (15488), 26 states have internal predecessors, (15488), 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 16:30:00,401 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:30:00,401 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 16:30:00,407 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-08-26 16:30:00,606 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-08-26 16:30:00,606 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting thread3Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:30:00,607 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:30:00,607 INFO L85 PathProgramCache]: Analyzing trace with hash -461568165, now seen corresponding path program 1 times [2023-08-26 16:30:00,607 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:30:00,607 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443904192] [2023-08-26 16:30:00,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:30:00,607 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:30:00,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:30:01,202 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 15 proven. 9 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-08-26 16:30:01,202 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:30:01,202 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443904192] [2023-08-26 16:30:01,202 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1443904192] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:30:01,202 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1448069474] [2023-08-26 16:30:01,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:30:01,203 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:30:01,203 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:30:01,205 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 16:30:01,216 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-08-26 16:30:01,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:30:01,459 INFO L262 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 29 conjunts are in the unsatisfiable core [2023-08-26 16:30:01,461 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:30:01,505 INFO L322 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2023-08-26 16:30:01,505 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 3 case distinctions, treesize of input 15 treesize of output 42 [2023-08-26 16:30:01,622 INFO L322 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-08-26 16:30:01,622 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2023-08-26 16:30:01,626 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-08-26 16:30:01,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-08-26 16:30:01,665 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2023-08-26 16:30:01,670 INFO L322 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-08-26 16:30:01,670 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-08-26 16:30:01,741 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:30:01,742 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:30:07,868 WARN L234 SmtUtils]: Spent 6.01s on a formula simplification that was a NOOP. DAG size: 22 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-08-26 16:30:09,827 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 158 treesize of output 152 [2023-08-26 16:30:10,214 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:30:10,215 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1448069474] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:30:10,215 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:30:10,215 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 29 [2023-08-26 16:30:10,216 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817191230] [2023-08-26 16:30:10,216 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:30:10,216 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-08-26 16:30:10,216 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:30:10,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-08-26 16:30:10,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=799, Unknown=0, NotChecked=0, Total=930 [2023-08-26 16:30:10,223 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 588 out of 1849 [2023-08-26 16:30:10,231 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 116 places, 86 transitions, 444 flow. Second operand has 31 states, 31 states have (on average 589.8064516129032) internal successors, (18284), 31 states have internal predecessors, (18284), 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 16:30:10,232 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:30:10,232 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 588 of 1849 [2023-08-26 16:30:10,232 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:30:22,406 INFO L124 PetriNetUnfolderBase]: 66384/90385 cut-off events. [2023-08-26 16:30:22,406 INFO L125 PetriNetUnfolderBase]: For 76895/76895 co-relation queries the response was YES. [2023-08-26 16:30:22,810 INFO L83 FinitePrefix]: Finished finitePrefix Result has 234934 conditions, 90385 events. 66384/90385 cut-off events. For 76895/76895 co-relation queries the response was YES. Maximal size of possible extension queue 1211. Compared 532379 event pairs, 12153 based on Foata normal form. 0/67749 useless extension candidates. Maximal degree in co-relation 234905. Up to 35590 conditions per place. [2023-08-26 16:30:23,054 INFO L140 encePairwiseOnDemand]: 1839/1849 looper letters, 175 selfloop transitions, 18 changer transitions 0/193 dead transitions. [2023-08-26 16:30:23,054 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 129 places, 193 transitions, 1318 flow [2023-08-26 16:30:23,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-08-26 16:30:23,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2023-08-26 16:30:23,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 8976 transitions. [2023-08-26 16:30:23,060 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.32363439697133584 [2023-08-26 16:30:23,060 INFO L72 ComplementDD]: Start complementDD. Operand 15 states and 8976 transitions. [2023-08-26 16:30:23,060 INFO L73 IsDeterministic]: Start isDeterministic. Operand 15 states and 8976 transitions. [2023-08-26 16:30:23,061 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:30:23,062 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 15 states and 8976 transitions. [2023-08-26 16:30:23,069 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 16 states, 15 states have (on average 598.4) internal successors, (8976), 15 states have internal predecessors, (8976), 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 16:30:23,087 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 16 states, 16 states have (on average 1849.0) internal successors, (29584), 16 states have internal predecessors, (29584), 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 16:30:23,091 INFO L81 ComplementDD]: Finished complementDD. Result has 16 states, 16 states have (on average 1849.0) internal successors, (29584), 16 states have internal predecessors, (29584), 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 16:30:23,091 INFO L175 Difference]: Start difference. First operand has 116 places, 86 transitions, 444 flow. Second operand 15 states and 8976 transitions. [2023-08-26 16:30:23,091 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 129 places, 193 transitions, 1318 flow [2023-08-26 16:30:23,139 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 118 places, 193 transitions, 1281 flow, removed 3 selfloop flow, removed 11 redundant places. [2023-08-26 16:30:23,140 INFO L231 Difference]: Finished difference. Result has 119 places, 86 transitions, 451 flow [2023-08-26 16:30:23,141 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=409, PETRI_DIFFERENCE_MINUEND_PLACES=104, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=85, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=17, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=67, PETRI_DIFFERENCE_SUBTRAHEND_STATES=15, PETRI_FLOW=451, PETRI_PLACES=119, PETRI_TRANSITIONS=86} [2023-08-26 16:30:23,141 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, 7 predicate places. [2023-08-26 16:30:23,141 INFO L495 AbstractCegarLoop]: Abstraction has has 119 places, 86 transitions, 451 flow [2023-08-26 16:30:23,143 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 589.8064516129032) internal successors, (18284), 31 states have internal predecessors, (18284), 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 16:30:23,143 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:30:23,143 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 16:30:23,148 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-08-26 16:30:23,343 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-08-26 16:30:23,344 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting thread3Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:30:23,344 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:30:23,344 INFO L85 PathProgramCache]: Analyzing trace with hash -461568164, now seen corresponding path program 1 times [2023-08-26 16:30:23,344 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:30:23,344 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2734476] [2023-08-26 16:30:23,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:30:23,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:30:23,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:30:23,672 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:30:23,672 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:30:23,673 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2734476] [2023-08-26 16:30:23,673 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2734476] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:30:23,673 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1123967879] [2023-08-26 16:30:23,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:30:23,673 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:30:23,673 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:30:23,677 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 16:30:23,681 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-08-26 16:30:23,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:30:23,906 INFO L262 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 19 conjunts are in the unsatisfiable core [2023-08-26 16:30:23,907 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:30:23,910 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 16:30:24,013 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:30:24,013 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:30:24,187 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:30:24,188 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1123967879] provided 1 perfect and 1 imperfect interpolant sequences [2023-08-26 16:30:24,188 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-08-26 16:30:24,188 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [9, 9] total 25 [2023-08-26 16:30:24,188 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275290718] [2023-08-26 16:30:24,188 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 16:30:24,188 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-08-26 16:30:24,188 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:30:24,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-08-26 16:30:24,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2023-08-26 16:30:24,191 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 620 out of 1849 [2023-08-26 16:30:24,193 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 119 places, 86 transitions, 451 flow. Second operand has 10 states, 10 states have (on average 621.8) internal successors, (6218), 10 states have internal predecessors, (6218), 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 16:30:24,193 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:30:24,193 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 620 of 1849 [2023-08-26 16:30:24,193 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 16:30:34,343 INFO L124 PetriNetUnfolderBase]: 54068/73693 cut-off events. [2023-08-26 16:30:34,343 INFO L125 PetriNetUnfolderBase]: For 57697/57697 co-relation queries the response was YES. [2023-08-26 16:30:34,712 INFO L83 FinitePrefix]: Finished finitePrefix Result has 200004 conditions, 73693 events. 54068/73693 cut-off events. For 57697/57697 co-relation queries the response was YES. Maximal size of possible extension queue 975. Compared 422420 event pairs, 33025 based on Foata normal form. 0/62709 useless extension candidates. Maximal degree in co-relation 199974. Up to 56962 conditions per place. [2023-08-26 16:30:34,916 INFO L140 encePairwiseOnDemand]: 1843/1849 looper letters, 135 selfloop transitions, 4 changer transitions 0/139 dead transitions. [2023-08-26 16:30:34,916 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 123 places, 139 transitions, 970 flow [2023-08-26 16:30:34,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 16:30:34,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 16:30:34,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 3202 transitions. [2023-08-26 16:30:34,920 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.34634937804218496 [2023-08-26 16:30:34,920 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 3202 transitions. [2023-08-26 16:30:34,920 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 3202 transitions. [2023-08-26 16:30:34,920 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 16:30:34,920 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 3202 transitions. [2023-08-26 16:30:34,922 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 640.4) internal successors, (3202), 5 states have internal predecessors, (3202), 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 16:30:34,926 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 1849.0) internal successors, (11094), 6 states have internal predecessors, (11094), 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 16:30:34,926 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 1849.0) internal successors, (11094), 6 states have internal predecessors, (11094), 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 16:30:34,926 INFO L175 Difference]: Start difference. First operand has 119 places, 86 transitions, 451 flow. Second operand 5 states and 3202 transitions. [2023-08-26 16:30:34,927 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 123 places, 139 transitions, 970 flow [2023-08-26 16:30:35,017 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 111 places, 139 transitions, 937 flow, removed 0 selfloop flow, removed 12 redundant places. [2023-08-26 16:30:35,018 INFO L231 Difference]: Finished difference. Result has 112 places, 86 transitions, 432 flow [2023-08-26 16:30:35,019 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=1849, PETRI_DIFFERENCE_MINUEND_FLOW=418, PETRI_DIFFERENCE_MINUEND_PLACES=107, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=86, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=82, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=432, PETRI_PLACES=112, PETRI_TRANSITIONS=86} [2023-08-26 16:30:35,019 INFO L281 CegarLoopForPetriNet]: 112 programPoint places, 0 predicate places. [2023-08-26 16:30:35,019 INFO L495 AbstractCegarLoop]: Abstraction has has 112 places, 86 transitions, 432 flow [2023-08-26 16:30:35,020 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 621.8) internal successors, (6218), 10 states have internal predecessors, (6218), 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 16:30:35,020 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 16:30:35,020 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 16:30:35,025 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-08-26 16:30:35,220 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:30:35,221 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting thread3Err3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thread1Err0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thread1Err2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 115 more)] === [2023-08-26 16:30:35,221 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 16:30:35,221 INFO L85 PathProgramCache]: Analyzing trace with hash -1423705157, now seen corresponding path program 1 times [2023-08-26 16:30:35,221 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 16:30:35,221 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1444582082] [2023-08-26 16:30:35,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:30:35,221 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 16:30:35,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:30:35,721 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:30:35,721 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 16:30:35,721 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1444582082] [2023-08-26 16:30:35,721 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1444582082] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 16:30:35,721 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1883331569] [2023-08-26 16:30:35,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 16:30:35,721 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 16:30:35,722 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 16:30:35,725 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-08-26 16:30:35,753 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-08-26 16:30:35,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 16:30:35,981 INFO L262 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 20 conjunts are in the unsatisfiable core [2023-08-26 16:30:35,983 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 16:30:35,988 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 16:30:36,133 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-08-26 16:30:36,136 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 17 [2023-08-26 16:30:36,153 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:30:36,153 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 16:30:36,202 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 95 treesize of output 83 [2023-08-26 16:30:36,206 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 81 [2023-08-26 16:30:36,413 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-08-26 16:30:36,413 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1883331569] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 16:30:36,413 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 16:30:36,414 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 30 [2023-08-26 16:30:36,414 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220451347] [2023-08-26 16:30:36,414 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 16:30:36,414 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-08-26 16:30:36,414 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 16:30:36,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-08-26 16:30:36,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=731, Unknown=0, NotChecked=0, Total=930 [2023-08-26 16:30:36,423 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 618 out of 1849 [2023-08-26 16:30:36,431 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 112 places, 86 transitions, 432 flow. Second operand has 31 states, 31 states have (on average 619.7096774193549) internal successors, (19211), 31 states have internal predecessors, (19211), 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 16:30:36,431 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 16:30:36,431 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 618 of 1849 [2023-08-26 16:30:36,432 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand