/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 PROGRAM_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/goblint-regression/28-race_reach_07-cond_racing2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 18:45:44,599 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 18:45:44,652 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 18:45:44,658 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 18:45:44,658 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 18:45:44,681 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 18:45:44,681 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 18:45:44,682 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 18:45:44,682 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 18:45:44,685 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 18:45:44,685 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 18:45:44,685 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 18:45:44,685 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 18:45:44,686 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 18:45:44,686 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 18:45:44,686 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 18:45:44,687 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 18:45:44,687 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 18:45:44,687 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 18:45:44,687 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 18:45:44,687 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 18:45:44,688 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 18:45:44,688 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 18:45:44,688 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 18:45:44,689 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 18:45:44,689 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 18:45:44,689 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 18:45:44,689 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:45:44,689 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 18:45:44,689 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 18:45:44,690 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 18:45:44,690 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 18:45:44,690 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 18:45:44,690 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 18:45:44,690 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 18:45:44,691 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> PROGRAM_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 18:45:44,895 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 18:45:44,910 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 18:45:44,912 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 18:45:44,913 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 18:45:44,913 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 18:45:44,914 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/goblint-regression/28-race_reach_07-cond_racing2.i [2023-08-26 18:45:45,845 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 18:45:46,079 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 18:45:46,079 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/goblint-regression/28-race_reach_07-cond_racing2.i [2023-08-26 18:45:46,098 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ad8bafe53/63ac44444a714c778fc7614aa2d751d5/FLAG3fcd6db22 [2023-08-26 18:45:46,107 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ad8bafe53/63ac44444a714c778fc7614aa2d751d5 [2023-08-26 18:45:46,108 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 18:45:46,109 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 18:45:46,110 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 18:45:46,110 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 18:45:46,111 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 18:45:46,112 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:45:46" (1/1) ... [2023-08-26 18:45:46,112 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@64e3a7bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:45:46, skipping insertion in model container [2023-08-26 18:45:46,112 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:45:46" (1/1) ... [2023-08-26 18:45:46,152 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 18:45:46,451 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:45:46,461 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 18:45:46,478 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: unsigned short [119] [2023-08-26 18:45:46,493 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [481] [2023-08-26 18:45:46,493 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [481] [2023-08-26 18:45:46,514 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:45:46,562 INFO L206 MainTranslator]: Completed translation [2023-08-26 18:45:46,563 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:45:46 WrapperNode [2023-08-26 18:45:46,563 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 18:45:46,564 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 18:45:46,564 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 18:45:46,564 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 18:45:46,569 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:45:46" (1/1) ... [2023-08-26 18:45:46,592 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:45:46" (1/1) ... [2023-08-26 18:45:46,606 INFO L138 Inliner]: procedures = 270, calls = 31, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 95 [2023-08-26 18:45:46,606 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 18:45:46,607 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 18:45:46,607 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 18:45:46,607 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 18:45:46,612 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:45:46" (1/1) ... [2023-08-26 18:45:46,612 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:45:46" (1/1) ... [2023-08-26 18:45:46,626 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:45:46" (1/1) ... [2023-08-26 18:45:46,626 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:45:46" (1/1) ... [2023-08-26 18:45:46,631 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:45:46" (1/1) ... [2023-08-26 18:45:46,633 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:45:46" (1/1) ... [2023-08-26 18:45:46,634 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:45:46" (1/1) ... [2023-08-26 18:45:46,635 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:45:46" (1/1) ... [2023-08-26 18:45:46,637 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 18:45:46,637 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 18:45:46,638 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 18:45:46,638 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 18:45:46,638 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:45:46" (1/1) ... [2023-08-26 18:45:46,647 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:45:46,656 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:45:46,668 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 18:45:46,687 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 18:45:46,697 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 18:45:46,698 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 18:45:46,698 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-08-26 18:45:46,698 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 18:45:46,698 INFO L130 BoogieDeclarations]: Found specification of procedure #PthreadsMutexLock [2023-08-26 18:45:46,698 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 18:45:46,698 INFO L130 BoogieDeclarations]: Found specification of procedure t_fun [2023-08-26 18:45:46,699 INFO L138 BoogieDeclarations]: Found implementation of procedure t_fun [2023-08-26 18:45:46,699 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 18:45:46,699 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 18:45:46,699 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 18:45:46,700 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 18:45:46,833 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 18:45:46,835 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 18:45:47,003 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 18:45:47,008 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 18:45:47,008 INFO L302 CfgBuilder]: Removed 10 assume(true) statements. [2023-08-26 18:45:47,010 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:45:47 BoogieIcfgContainer [2023-08-26 18:45:47,010 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 18:45:47,011 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 18:45:47,011 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 18:45:47,013 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 18:45:47,013 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 06:45:46" (1/3) ... [2023-08-26 18:45:47,014 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@678c63b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:45:47, skipping insertion in model container [2023-08-26 18:45:47,014 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:45:46" (2/3) ... [2023-08-26 18:45:47,014 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@678c63b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:45:47, skipping insertion in model container [2023-08-26 18:45:47,014 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:45:47" (3/3) ... [2023-08-26 18:45:47,015 INFO L112 eAbstractionObserver]: Analyzing ICFG 28-race_reach_07-cond_racing2.i [2023-08-26 18:45:47,037 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 18:45:47,037 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2023-08-26 18:45:47,037 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 18:45:47,085 INFO L144 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2023-08-26 18:45:47,107 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 118 places, 131 transitions, 270 flow [2023-08-26 18:45:47,148 INFO L124 PetriNetUnfolderBase]: 25/183 cut-off events. [2023-08-26 18:45:47,148 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:45:47,153 INFO L83 FinitePrefix]: Finished finitePrefix Result has 189 conditions, 183 events. 25/183 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 456 event pairs, 0 based on Foata normal form. 0/145 useless extension candidates. Maximal degree in co-relation 91. Up to 6 conditions per place. [2023-08-26 18:45:47,153 INFO L82 GeneralOperation]: Start removeDead. Operand has 118 places, 131 transitions, 270 flow [2023-08-26 18:45:47,156 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 118 places, 131 transitions, 270 flow [2023-08-26 18:45:47,158 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:45:47,163 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 118 places, 131 transitions, 270 flow [2023-08-26 18:45:47,165 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 118 places, 131 transitions, 270 flow [2023-08-26 18:45:47,165 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 118 places, 131 transitions, 270 flow [2023-08-26 18:45:47,190 INFO L124 PetriNetUnfolderBase]: 25/183 cut-off events. [2023-08-26 18:45:47,190 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:45:47,191 INFO L83 FinitePrefix]: Finished finitePrefix Result has 189 conditions, 183 events. 25/183 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 456 event pairs, 0 based on Foata normal form. 0/145 useless extension candidates. Maximal degree in co-relation 91. Up to 6 conditions per place. [2023-08-26 18:45:47,192 INFO L119 LiptonReduction]: Number of co-enabled transitions 3248 [2023-08-26 18:45:49,962 INFO L134 LiptonReduction]: Checked pairs total: 5599 [2023-08-26 18:45:49,962 INFO L136 LiptonReduction]: Total number of compositions: 124 [2023-08-26 18:45:49,971 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:45:49,974 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;@7a2f1a0a, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:45:49,975 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:45:49,976 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:45:49,976 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 18:45:49,976 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:45:49,976 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:45:49,977 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:45:49,977 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:45:49,980 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:45:49,980 INFO L85 PathProgramCache]: Analyzing trace with hash 16412, now seen corresponding path program 1 times [2023-08-26 18:45:49,987 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:45:49,988 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70147588] [2023-08-26 18:45:49,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:45:49,988 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:45:50,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:45:50,188 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 18:45:50,188 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:45:50,188 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70147588] [2023-08-26 18:45:50,189 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [70147588] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:45:50,189 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:45:50,189 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:45:50,190 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299029752] [2023-08-26 18:45:50,190 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:45:50,195 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:45:50,198 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:45:50,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:45:50,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:45:50,225 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 101 out of 255 [2023-08-26 18:45:50,228 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 33 places, 42 transitions, 92 flow. Second operand has 3 states, 3 states have (on average 101.66666666666667) internal successors, (305), 3 states have internal predecessors, (305), 0 states have call successors, (0), 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 18:45:50,229 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:45:50,229 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 101 of 255 [2023-08-26 18:45:50,229 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:45:50,329 INFO L124 PetriNetUnfolderBase]: 115/259 cut-off events. [2023-08-26 18:45:50,329 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:45:50,333 INFO L83 FinitePrefix]: Finished finitePrefix Result has 523 conditions, 259 events. 115/259 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 1033 event pairs, 96 based on Foata normal form. 14/212 useless extension candidates. Maximal degree in co-relation 477. Up to 237 conditions per place. [2023-08-26 18:45:50,336 INFO L140 encePairwiseOnDemand]: 241/255 looper letters, 24 selfloop transitions, 1 changer transitions 10/36 dead transitions. [2023-08-26 18:45:50,336 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 36 transitions, 148 flow [2023-08-26 18:45:50,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:45:50,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:45:50,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 355 transitions. [2023-08-26 18:45:50,351 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46405228758169936 [2023-08-26 18:45:50,351 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 355 transitions. [2023-08-26 18:45:50,352 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 355 transitions. [2023-08-26 18:45:50,354 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:45:50,355 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 355 transitions. [2023-08-26 18:45:50,360 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 118.33333333333333) internal successors, (355), 3 states have internal predecessors, (355), 0 states have call successors, (0), 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 18:45:50,363 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 255.0) internal successors, (1020), 4 states have internal predecessors, (1020), 0 states have call successors, (0), 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 18:45:50,363 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 255.0) internal successors, (1020), 4 states have internal predecessors, (1020), 0 states have call successors, (0), 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 18:45:50,365 INFO L175 Difference]: Start difference. First operand has 33 places, 42 transitions, 92 flow. Second operand 3 states and 355 transitions. [2023-08-26 18:45:50,366 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 36 transitions, 148 flow [2023-08-26 18:45:50,367 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 31 places, 36 transitions, 148 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:45:50,368 INFO L231 Difference]: Finished difference. Result has 31 places, 26 transitions, 60 flow [2023-08-26 18:45:50,370 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=255, PETRI_DIFFERENCE_MINUEND_FLOW=64, PETRI_DIFFERENCE_MINUEND_PLACES=29, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=28, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=27, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=60, PETRI_PLACES=31, PETRI_TRANSITIONS=26} [2023-08-26 18:45:50,372 INFO L281 CegarLoopForPetriNet]: 33 programPoint places, -2 predicate places. [2023-08-26 18:45:50,373 INFO L495 AbstractCegarLoop]: Abstraction has has 31 places, 26 transitions, 60 flow [2023-08-26 18:45:50,373 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 101.66666666666667) internal successors, (305), 3 states have internal predecessors, (305), 0 states have call successors, (0), 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 18:45:50,373 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:45:50,373 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:45:50,373 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 18:45:50,373 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:45:50,374 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:45:50,375 INFO L85 PathProgramCache]: Analyzing trace with hash 16413, now seen corresponding path program 1 times [2023-08-26 18:45:50,375 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:45:50,375 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2043190041] [2023-08-26 18:45:50,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:45:50,375 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:45:50,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:45:50,495 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 18:45:50,495 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:45:50,495 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2043190041] [2023-08-26 18:45:50,495 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2043190041] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:45:50,495 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:45:50,496 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:45:50,496 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080379413] [2023-08-26 18:45:50,496 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:45:50,497 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:45:50,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:45:50,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:45:50,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:45:50,498 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 96 out of 255 [2023-08-26 18:45:50,499 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 31 places, 26 transitions, 60 flow. Second operand has 3 states, 3 states have (on average 96.66666666666667) internal successors, (290), 3 states have internal predecessors, (290), 0 states have call successors, (0), 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 18:45:50,499 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:45:50,499 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 96 of 255 [2023-08-26 18:45:50,499 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:45:50,562 INFO L124 PetriNetUnfolderBase]: 105/229 cut-off events. [2023-08-26 18:45:50,562 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:45:50,562 INFO L83 FinitePrefix]: Finished finitePrefix Result has 465 conditions, 229 events. 105/229 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 978 event pairs, 0 based on Foata normal form. 0/183 useless extension candidates. Maximal degree in co-relation 458. Up to 218 conditions per place. [2023-08-26 18:45:50,563 INFO L140 encePairwiseOnDemand]: 250/255 looper letters, 31 selfloop transitions, 2 changer transitions 1/35 dead transitions. [2023-08-26 18:45:50,563 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 35 transitions, 146 flow [2023-08-26 18:45:50,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:45:50,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:45:50,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 325 transitions. [2023-08-26 18:45:50,565 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42483660130718953 [2023-08-26 18:45:50,565 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 325 transitions. [2023-08-26 18:45:50,565 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 325 transitions. [2023-08-26 18:45:50,581 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:45:50,582 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 325 transitions. [2023-08-26 18:45:50,583 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 108.33333333333333) internal successors, (325), 3 states have internal predecessors, (325), 0 states have call successors, (0), 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 18:45:50,585 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 255.0) internal successors, (1020), 4 states have internal predecessors, (1020), 0 states have call successors, (0), 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 18:45:50,586 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 255.0) internal successors, (1020), 4 states have internal predecessors, (1020), 0 states have call successors, (0), 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 18:45:50,586 INFO L175 Difference]: Start difference. First operand has 31 places, 26 transitions, 60 flow. Second operand 3 states and 325 transitions. [2023-08-26 18:45:50,586 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 35 transitions, 146 flow [2023-08-26 18:45:50,587 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 29 places, 35 transitions, 143 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:45:50,587 INFO L231 Difference]: Finished difference. Result has 30 places, 26 transitions, 69 flow [2023-08-26 18:45:50,587 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=255, PETRI_DIFFERENCE_MINUEND_FLOW=57, PETRI_DIFFERENCE_MINUEND_PLACES=27, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=26, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=24, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=69, PETRI_PLACES=30, PETRI_TRANSITIONS=26} [2023-08-26 18:45:50,588 INFO L281 CegarLoopForPetriNet]: 33 programPoint places, -3 predicate places. [2023-08-26 18:45:50,589 INFO L495 AbstractCegarLoop]: Abstraction has has 30 places, 26 transitions, 69 flow [2023-08-26 18:45:50,590 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 96.66666666666667) internal successors, (290), 3 states have internal predecessors, (290), 0 states have call successors, (0), 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 18:45:50,591 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:45:50,592 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2023-08-26 18:45:50,592 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-26 18:45:50,593 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:45:50,595 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:45:50,595 INFO L85 PathProgramCache]: Analyzing trace with hash 489259901, now seen corresponding path program 1 times [2023-08-26 18:45:50,595 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:45:50,595 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [613172288] [2023-08-26 18:45:50,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:45:50,599 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:45:50,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:45:50,709 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 18:45:50,709 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:45:50,709 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [613172288] [2023-08-26 18:45:50,710 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [613172288] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:45:50,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1313459799] [2023-08-26 18:45:50,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:45:50,711 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:45:50,711 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:45:50,712 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 18:45:50,756 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 18:45:50,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:45:50,808 INFO L262 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:45:50,811 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:45:50,873 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 18:45:50,905 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 18:45:50,905 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:45:50,938 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 18:45:50,938 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1313459799] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:45:50,938 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:45:50,939 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:45:50,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095614772] [2023-08-26 18:45:50,939 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:45:50,939 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:45:50,939 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:45:50,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:45:50,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:45:50,940 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 96 out of 255 [2023-08-26 18:45:50,941 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 30 places, 26 transitions, 69 flow. Second operand has 8 states, 8 states have (on average 97.875) internal successors, (783), 8 states have internal predecessors, (783), 0 states have call successors, (0), 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 18:45:50,941 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:45:50,941 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 96 of 255 [2023-08-26 18:45:50,941 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:45:50,992 INFO L124 PetriNetUnfolderBase]: 16/46 cut-off events. [2023-08-26 18:45:50,992 INFO L125 PetriNetUnfolderBase]: For 8/8 co-relation queries the response was YES. [2023-08-26 18:45:50,992 INFO L83 FinitePrefix]: Finished finitePrefix Result has 117 conditions, 46 events. 16/46 cut-off events. For 8/8 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 84 event pairs, 0 based on Foata normal form. 9/55 useless extension candidates. Maximal degree in co-relation 108. Up to 34 conditions per place. [2023-08-26 18:45:50,992 INFO L140 encePairwiseOnDemand]: 250/255 looper letters, 0 selfloop transitions, 0 changer transitions 22/22 dead transitions. [2023-08-26 18:45:50,992 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 22 places, 22 transitions, 95 flow [2023-08-26 18:45:50,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:45:50,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:45:50,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 408 transitions. [2023-08-26 18:45:50,993 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4 [2023-08-26 18:45:50,994 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 408 transitions. [2023-08-26 18:45:50,994 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 408 transitions. [2023-08-26 18:45:50,994 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:45:50,994 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 408 transitions. [2023-08-26 18:45:50,995 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 102.0) internal successors, (408), 4 states have internal predecessors, (408), 0 states have call successors, (0), 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 18:45:50,996 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 255.0) internal successors, (1275), 5 states have internal predecessors, (1275), 0 states have call successors, (0), 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 18:45:50,996 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 255.0) internal successors, (1275), 5 states have internal predecessors, (1275), 0 states have call successors, (0), 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 18:45:50,996 INFO L175 Difference]: Start difference. First operand has 30 places, 26 transitions, 69 flow. Second operand 4 states and 408 transitions. [2023-08-26 18:45:50,997 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 22 places, 22 transitions, 95 flow [2023-08-26 18:45:50,997 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 19 places, 22 transitions, 89 flow, removed 0 selfloop flow, removed 3 redundant places. [2023-08-26 18:45:50,997 INFO L231 Difference]: Finished difference. Result has 19 places, 0 transitions, 0 flow [2023-08-26 18:45:50,997 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=255, PETRI_DIFFERENCE_MINUEND_FLOW=29, PETRI_DIFFERENCE_MINUEND_PLACES=16, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=13, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=13, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=0, PETRI_PLACES=19, PETRI_TRANSITIONS=0} [2023-08-26 18:45:50,998 INFO L281 CegarLoopForPetriNet]: 33 programPoint places, -14 predicate places. [2023-08-26 18:45:50,998 INFO L495 AbstractCegarLoop]: Abstraction has has 19 places, 0 transitions, 0 flow [2023-08-26 18:45:50,998 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 97.875) internal successors, (783), 8 states have internal predecessors, (783), 0 states have call successors, (0), 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 18:45:51,000 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 5 remaining) [2023-08-26 18:45:51,000 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 5 remaining) [2023-08-26 18:45:51,001 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 5 remaining) [2023-08-26 18:45:51,001 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 5 remaining) [2023-08-26 18:45:51,001 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 5 remaining) [2023-08-26 18:45:51,008 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-08-26 18:45:51,205 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 18:45:51,206 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2023-08-26 18:45:51,207 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:45:51,210 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 118 places, 131 transitions, 270 flow [2023-08-26 18:45:51,224 INFO L124 PetriNetUnfolderBase]: 25/183 cut-off events. [2023-08-26 18:45:51,224 INFO L125 PetriNetUnfolderBase]: For 1/1 co-relation queries the response was YES. [2023-08-26 18:45:51,225 INFO L83 FinitePrefix]: Finished finitePrefix Result has 189 conditions, 183 events. 25/183 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 456 event pairs, 0 based on Foata normal form. 0/145 useless extension candidates. Maximal degree in co-relation 91. Up to 6 conditions per place. [2023-08-26 18:45:51,225 INFO L82 GeneralOperation]: Start removeDead. Operand has 118 places, 131 transitions, 270 flow [2023-08-26 18:45:51,225 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 114 places, 126 transitions, 257 flow [2023-08-26 18:45:51,225 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:45:51,225 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 114 places, 126 transitions, 257 flow [2023-08-26 18:45:51,226 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 114 places, 126 transitions, 257 flow [2023-08-26 18:45:51,226 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 114 places, 126 transitions, 257 flow [2023-08-26 18:45:51,236 INFO L124 PetriNetUnfolderBase]: 24/178 cut-off events. [2023-08-26 18:45:51,236 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:45:51,236 INFO L83 FinitePrefix]: Finished finitePrefix Result has 183 conditions, 178 events. 24/178 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 438 event pairs, 0 based on Foata normal form. 0/140 useless extension candidates. Maximal degree in co-relation 91. Up to 6 conditions per place. [2023-08-26 18:45:51,237 INFO L119 LiptonReduction]: Number of co-enabled transitions 3248 [2023-08-26 18:45:53,858 INFO L134 LiptonReduction]: Checked pairs total: 5933 [2023-08-26 18:45:53,858 INFO L136 LiptonReduction]: Total number of compositions: 121 [2023-08-26 18:45:53,859 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:45:53,860 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;@7a2f1a0a, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:45:53,860 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:45:53,863 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:45:53,863 INFO L124 PetriNetUnfolderBase]: 6/35 cut-off events. [2023-08-26 18:45:53,863 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:45:53,863 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:45:53,863 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2023-08-26 18:45:53,863 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:45:53,863 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:45:53,864 INFO L85 PathProgramCache]: Analyzing trace with hash 1565955887, now seen corresponding path program 1 times [2023-08-26 18:45:53,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:45:53,864 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609607552] [2023-08-26 18:45:53,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:45:53,864 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:45:53,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:45:53,876 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:45:53,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:45:53,890 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:45:53,891 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:45:53,891 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:45:53,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 18:45:53,891 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:45:53,891 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:45:53,892 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:45:53,892 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 18:45:53,903 INFO L144 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2023-08-26 18:45:53,906 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 143 places, 161 transitions, 340 flow [2023-08-26 18:45:53,926 INFO L124 PetriNetUnfolderBase]: 43/292 cut-off events. [2023-08-26 18:45:53,926 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:45:53,927 INFO L83 FinitePrefix]: Finished finitePrefix Result has 306 conditions, 292 events. 43/292 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 900 event pairs, 0 based on Foata normal form. 0/228 useless extension candidates. Maximal degree in co-relation 185. Up to 9 conditions per place. [2023-08-26 18:45:53,927 INFO L82 GeneralOperation]: Start removeDead. Operand has 143 places, 161 transitions, 340 flow [2023-08-26 18:45:53,929 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 143 places, 161 transitions, 340 flow [2023-08-26 18:45:53,929 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:45:53,929 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 143 places, 161 transitions, 340 flow [2023-08-26 18:45:53,929 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 143 places, 161 transitions, 340 flow [2023-08-26 18:45:53,931 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 143 places, 161 transitions, 340 flow [2023-08-26 18:45:53,948 INFO L124 PetriNetUnfolderBase]: 43/292 cut-off events. [2023-08-26 18:45:53,949 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:45:53,950 INFO L83 FinitePrefix]: Finished finitePrefix Result has 306 conditions, 292 events. 43/292 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 900 event pairs, 0 based on Foata normal form. 0/228 useless extension candidates. Maximal degree in co-relation 185. Up to 9 conditions per place. [2023-08-26 18:45:53,953 INFO L119 LiptonReduction]: Number of co-enabled transitions 8680 [2023-08-26 18:45:56,466 INFO L134 LiptonReduction]: Checked pairs total: 19904 [2023-08-26 18:45:56,466 INFO L136 LiptonReduction]: Total number of compositions: 132 [2023-08-26 18:45:56,468 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:45:56,468 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;@7a2f1a0a, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:45:56,468 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:45:56,469 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:45:56,469 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:45:56,469 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:45:56,469 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:45:56,469 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:45:56,469 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:45:56,470 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:45:56,470 INFO L85 PathProgramCache]: Analyzing trace with hash 30625, now seen corresponding path program 1 times [2023-08-26 18:45:56,470 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:45:56,470 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1425571545] [2023-08-26 18:45:56,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:45:56,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:45:56,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:45:56,495 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 18:45:56,495 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:45:56,495 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1425571545] [2023-08-26 18:45:56,495 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1425571545] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:45:56,495 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:45:56,495 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:45:56,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619213882] [2023-08-26 18:45:56,496 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:45:56,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:45:56,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:45:56,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:45:56,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:45:56,498 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 123 out of 293 [2023-08-26 18:45:56,498 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 50 places, 63 transitions, 144 flow. Second operand has 3 states, 3 states have (on average 123.66666666666667) internal successors, (371), 3 states have internal predecessors, (371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:45:56,499 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:45:56,499 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 123 of 293 [2023-08-26 18:45:56,499 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:45:56,706 INFO L124 PetriNetUnfolderBase]: 1804/3279 cut-off events. [2023-08-26 18:45:56,707 INFO L125 PetriNetUnfolderBase]: For 45/45 co-relation queries the response was YES. [2023-08-26 18:45:56,709 INFO L83 FinitePrefix]: Finished finitePrefix Result has 6253 conditions, 3279 events. 1804/3279 cut-off events. For 45/45 co-relation queries the response was YES. Maximal size of possible extension queue 142. Compared 20698 event pairs, 1600 based on Foata normal form. 442/3148 useless extension candidates. Maximal degree in co-relation 3193. Up to 2717 conditions per place. [2023-08-26 18:45:56,718 INFO L140 encePairwiseOnDemand]: 274/293 looper letters, 32 selfloop transitions, 1 changer transitions 17/60 dead transitions. [2023-08-26 18:45:56,718 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 50 places, 60 transitions, 236 flow [2023-08-26 18:45:56,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:45:56,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:45:56,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 447 transitions. [2023-08-26 18:45:56,719 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5085324232081911 [2023-08-26 18:45:56,719 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 447 transitions. [2023-08-26 18:45:56,719 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 447 transitions. [2023-08-26 18:45:56,720 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:45:56,720 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 447 transitions. [2023-08-26 18:45:56,720 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 149.0) internal successors, (447), 3 states have internal predecessors, (447), 0 states have call successors, (0), 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 18:45:56,722 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 293.0) internal successors, (1172), 4 states have internal predecessors, (1172), 0 states have call successors, (0), 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 18:45:56,722 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 293.0) internal successors, (1172), 4 states have internal predecessors, (1172), 0 states have call successors, (0), 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 18:45:56,722 INFO L175 Difference]: Start difference. First operand has 50 places, 63 transitions, 144 flow. Second operand 3 states and 447 transitions. [2023-08-26 18:45:56,722 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 50 places, 60 transitions, 236 flow [2023-08-26 18:45:56,724 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 50 places, 60 transitions, 236 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:45:56,725 INFO L231 Difference]: Finished difference. Result has 50 places, 43 transitions, 102 flow [2023-08-26 18:45:56,725 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=293, PETRI_DIFFERENCE_MINUEND_FLOW=110, PETRI_DIFFERENCE_MINUEND_PLACES=48, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=46, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=45, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=102, PETRI_PLACES=50, PETRI_TRANSITIONS=43} [2023-08-26 18:45:56,727 INFO L281 CegarLoopForPetriNet]: 50 programPoint places, 0 predicate places. [2023-08-26 18:45:56,727 INFO L495 AbstractCegarLoop]: Abstraction has has 50 places, 43 transitions, 102 flow [2023-08-26 18:45:56,728 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 123.66666666666667) internal successors, (371), 3 states have internal predecessors, (371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:45:56,728 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:45:56,728 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:45:56,728 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 18:45:56,728 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:45:56,728 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:45:56,728 INFO L85 PathProgramCache]: Analyzing trace with hash 30624, now seen corresponding path program 1 times [2023-08-26 18:45:56,729 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:45:56,729 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386888472] [2023-08-26 18:45:56,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:45:56,729 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:45:56,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:45:56,768 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 18:45:56,768 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:45:56,768 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386888472] [2023-08-26 18:45:56,768 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [386888472] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:45:56,768 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:45:56,768 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:45:56,768 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781240392] [2023-08-26 18:45:56,768 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:45:56,768 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:45:56,769 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:45:56,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:45:56,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:45:56,769 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 118 out of 293 [2023-08-26 18:45:56,770 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 50 places, 43 transitions, 102 flow. Second operand has 3 states, 3 states have (on average 118.66666666666667) internal successors, (356), 3 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:45:56,770 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:45:56,770 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 118 of 293 [2023-08-26 18:45:56,770 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:45:56,966 INFO L124 PetriNetUnfolderBase]: 1562/2754 cut-off events. [2023-08-26 18:45:56,966 INFO L125 PetriNetUnfolderBase]: For 37/37 co-relation queries the response was YES. [2023-08-26 18:45:56,968 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5322 conditions, 2754 events. 1562/2754 cut-off events. For 37/37 co-relation queries the response was YES. Maximal size of possible extension queue 125. Compared 16739 event pairs, 704 based on Foata normal form. 0/2357 useless extension candidates. Maximal degree in co-relation 5314. Up to 2513 conditions per place. [2023-08-26 18:45:56,976 INFO L140 encePairwiseOnDemand]: 288/293 looper letters, 39 selfloop transitions, 2 changer transitions 0/51 dead transitions. [2023-08-26 18:45:56,976 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 51 transitions, 200 flow [2023-08-26 18:45:56,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:45:56,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:45:56,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 398 transitions. [2023-08-26 18:45:56,977 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4527872582480091 [2023-08-26 18:45:56,977 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 398 transitions. [2023-08-26 18:45:56,977 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 398 transitions. [2023-08-26 18:45:56,977 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:45:56,977 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 398 transitions. [2023-08-26 18:45:56,978 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 132.66666666666666) internal successors, (398), 3 states have internal predecessors, (398), 0 states have call successors, (0), 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 18:45:56,979 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 293.0) internal successors, (1172), 4 states have internal predecessors, (1172), 0 states have call successors, (0), 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 18:45:56,980 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 293.0) internal successors, (1172), 4 states have internal predecessors, (1172), 0 states have call successors, (0), 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 18:45:56,980 INFO L175 Difference]: Start difference. First operand has 50 places, 43 transitions, 102 flow. Second operand 3 states and 398 transitions. [2023-08-26 18:45:56,980 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 51 transitions, 200 flow [2023-08-26 18:45:56,982 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 47 places, 51 transitions, 197 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:45:56,983 INFO L231 Difference]: Finished difference. Result has 48 places, 44 transitions, 115 flow [2023-08-26 18:45:56,983 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=293, PETRI_DIFFERENCE_MINUEND_FLOW=99, PETRI_DIFFERENCE_MINUEND_PLACES=45, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=43, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=41, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=115, PETRI_PLACES=48, PETRI_TRANSITIONS=44} [2023-08-26 18:45:56,984 INFO L281 CegarLoopForPetriNet]: 50 programPoint places, -2 predicate places. [2023-08-26 18:45:56,984 INFO L495 AbstractCegarLoop]: Abstraction has has 48 places, 44 transitions, 115 flow [2023-08-26 18:45:56,985 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 118.66666666666667) internal successors, (356), 3 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:45:56,985 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:45:56,985 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:45:56,985 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 18:45:56,985 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:45:56,985 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:45:56,985 INFO L85 PathProgramCache]: Analyzing trace with hash -1756715782, now seen corresponding path program 1 times [2023-08-26 18:45:56,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:45:56,988 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1747539035] [2023-08-26 18:45:56,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:45:56,989 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:45:56,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:45:57,055 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 18:45:57,056 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:45:57,058 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1747539035] [2023-08-26 18:45:57,058 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1747539035] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:45:57,058 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [715754650] [2023-08-26 18:45:57,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:45:57,058 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:45:57,058 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:45:57,059 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 18:45:57,062 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 18:45:57,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:45:57,112 INFO L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:45:57,113 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:45:57,121 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 18:45:57,152 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 18:45:57,152 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:45:57,184 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 18:45:57,184 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [715754650] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:45:57,184 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:45:57,184 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:45:57,184 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500197487] [2023-08-26 18:45:57,184 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:45:57,185 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:45:57,185 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:45:57,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:45:57,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:45:57,186 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 118 out of 293 [2023-08-26 18:45:57,187 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 48 places, 44 transitions, 115 flow. Second operand has 8 states, 8 states have (on average 119.875) internal successors, (959), 8 states have internal predecessors, (959), 0 states have call successors, (0), 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 18:45:57,187 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:45:57,187 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 118 of 293 [2023-08-26 18:45:57,187 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:45:57,287 INFO L124 PetriNetUnfolderBase]: 286/532 cut-off events. [2023-08-26 18:45:57,287 INFO L125 PetriNetUnfolderBase]: For 87/87 co-relation queries the response was YES. [2023-08-26 18:45:57,287 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1131 conditions, 532 events. 286/532 cut-off events. For 87/87 co-relation queries the response was YES. Maximal size of possible extension queue 31. Compared 2479 event pairs, 40 based on Foata normal form. 70/599 useless extension candidates. Maximal degree in co-relation 1121. Up to 346 conditions per place. [2023-08-26 18:45:57,288 INFO L140 encePairwiseOnDemand]: 288/293 looper letters, 0 selfloop transitions, 0 changer transitions 51/51 dead transitions. [2023-08-26 18:45:57,288 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 40 places, 51 transitions, 202 flow [2023-08-26 18:45:57,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-08-26 18:45:57,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2023-08-26 18:45:57,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 638 transitions. [2023-08-26 18:45:57,290 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4354948805460751 [2023-08-26 18:45:57,290 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 638 transitions. [2023-08-26 18:45:57,290 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 638 transitions. [2023-08-26 18:45:57,290 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:45:57,290 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 638 transitions. [2023-08-26 18:45:57,292 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 127.6) internal successors, (638), 5 states have internal predecessors, (638), 0 states have call successors, (0), 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 18:45:57,293 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 293.0) internal successors, (1758), 6 states have internal predecessors, (1758), 0 states have call successors, (0), 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 18:45:57,293 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 293.0) internal successors, (1758), 6 states have internal predecessors, (1758), 0 states have call successors, (0), 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 18:45:57,293 INFO L175 Difference]: Start difference. First operand has 48 places, 44 transitions, 115 flow. Second operand 5 states and 638 transitions. [2023-08-26 18:45:57,293 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 40 places, 51 transitions, 202 flow [2023-08-26 18:45:57,295 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 39 places, 51 transitions, 200 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:45:57,295 INFO L231 Difference]: Finished difference. Result has 39 places, 0 transitions, 0 flow [2023-08-26 18:45:57,295 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=293, PETRI_DIFFERENCE_MINUEND_FLOW=72, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=0, PETRI_PLACES=39, PETRI_TRANSITIONS=0} [2023-08-26 18:45:57,296 INFO L281 CegarLoopForPetriNet]: 50 programPoint places, -11 predicate places. [2023-08-26 18:45:57,296 INFO L495 AbstractCegarLoop]: Abstraction has has 39 places, 0 transitions, 0 flow [2023-08-26 18:45:57,297 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 119.875) internal successors, (959), 8 states have internal predecessors, (959), 0 states have call successors, (0), 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 18:45:57,297 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 5 remaining) [2023-08-26 18:45:57,297 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 5 remaining) [2023-08-26 18:45:57,297 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 5 remaining) [2023-08-26 18:45:57,297 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 5 remaining) [2023-08-26 18:45:57,297 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 5 remaining) [2023-08-26 18:45:57,304 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 18:45:57,502 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-08-26 18:45:57,502 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2023-08-26 18:45:57,502 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:45:57,505 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 143 places, 161 transitions, 340 flow [2023-08-26 18:45:57,521 INFO L124 PetriNetUnfolderBase]: 43/292 cut-off events. [2023-08-26 18:45:57,521 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:45:57,522 INFO L83 FinitePrefix]: Finished finitePrefix Result has 306 conditions, 292 events. 43/292 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 900 event pairs, 0 based on Foata normal form. 0/228 useless extension candidates. Maximal degree in co-relation 185. Up to 9 conditions per place. [2023-08-26 18:45:57,522 INFO L82 GeneralOperation]: Start removeDead. Operand has 143 places, 161 transitions, 340 flow [2023-08-26 18:45:57,523 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 143 places, 161 transitions, 340 flow [2023-08-26 18:45:57,523 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:45:57,523 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 143 places, 161 transitions, 340 flow [2023-08-26 18:45:57,523 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 143 places, 161 transitions, 340 flow [2023-08-26 18:45:57,523 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 143 places, 161 transitions, 340 flow [2023-08-26 18:45:57,537 INFO L124 PetriNetUnfolderBase]: 43/292 cut-off events. [2023-08-26 18:45:57,537 INFO L125 PetriNetUnfolderBase]: For 6/6 co-relation queries the response was YES. [2023-08-26 18:45:57,538 INFO L83 FinitePrefix]: Finished finitePrefix Result has 306 conditions, 292 events. 43/292 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 900 event pairs, 0 based on Foata normal form. 0/228 useless extension candidates. Maximal degree in co-relation 185. Up to 9 conditions per place. [2023-08-26 18:45:57,541 INFO L119 LiptonReduction]: Number of co-enabled transitions 8680 [2023-08-26 18:46:00,028 INFO L134 LiptonReduction]: Checked pairs total: 19876 [2023-08-26 18:46:00,028 INFO L136 LiptonReduction]: Total number of compositions: 135 [2023-08-26 18:46:00,029 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:46:00,029 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;@7a2f1a0a, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:46:00,029 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:46:00,033 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:46:00,033 INFO L124 PetriNetUnfolderBase]: 19/80 cut-off events. [2023-08-26 18:46:00,033 INFO L125 PetriNetUnfolderBase]: For 3/3 co-relation queries the response was YES. [2023-08-26 18:46:00,033 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:00,033 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2023-08-26 18:46:00,033 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:46:00,033 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:00,034 INFO L85 PathProgramCache]: Analyzing trace with hash 2030122466, now seen corresponding path program 1 times [2023-08-26 18:46:00,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:00,034 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [133224902] [2023-08-26 18:46:00,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:00,034 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:00,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:46:00,043 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:46:00,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:46:00,057 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:46:00,057 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:46:00,057 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:46:00,058 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-26 18:46:00,058 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:46:00,059 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:46:00,059 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:46:00,059 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 18:46:00,076 INFO L144 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2023-08-26 18:46:00,078 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:00,100 INFO L124 PetriNetUnfolderBase]: 66/438 cut-off events. [2023-08-26 18:46:00,100 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:46:00,101 INFO L83 FinitePrefix]: Finished finitePrefix Result has 466 conditions, 438 events. 66/438 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1528 event pairs, 1 based on Foata normal form. 0/340 useless extension candidates. Maximal degree in co-relation 300. Up to 16 conditions per place. [2023-08-26 18:46:00,101 INFO L82 GeneralOperation]: Start removeDead. Operand has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:00,103 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:00,103 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:46:00,103 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:00,103 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:00,103 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:00,125 INFO L124 PetriNetUnfolderBase]: 66/438 cut-off events. [2023-08-26 18:46:00,125 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:46:00,126 INFO L83 FinitePrefix]: Finished finitePrefix Result has 466 conditions, 438 events. 66/438 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1528 event pairs, 1 based on Foata normal form. 0/340 useless extension candidates. Maximal degree in co-relation 300. Up to 16 conditions per place. [2023-08-26 18:46:00,135 INFO L119 LiptonReduction]: Number of co-enabled transitions 15624 [2023-08-26 18:46:02,611 INFO L134 LiptonReduction]: Checked pairs total: 38251 [2023-08-26 18:46:02,611 INFO L136 LiptonReduction]: Total number of compositions: 150 [2023-08-26 18:46:02,612 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:46:02,612 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;@7a2f1a0a, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:46:02,612 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:46:02,613 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:46:02,613 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 18:46:02,613 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:46:02,613 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:02,613 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:46:02,613 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:46:02,613 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:02,613 INFO L85 PathProgramCache]: Analyzing trace with hash 46805, now seen corresponding path program 1 times [2023-08-26 18:46:02,614 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:02,614 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2015464262] [2023-08-26 18:46:02,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:02,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:02,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:02,640 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 18:46:02,640 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:46:02,640 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2015464262] [2023-08-26 18:46:02,640 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2015464262] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:46:02,640 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:46:02,640 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:46:02,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885629289] [2023-08-26 18:46:02,641 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:46:02,641 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:46:02,641 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:46:02,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:46:02,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:46:02,642 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 145 out of 341 [2023-08-26 18:46:02,642 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 65 places, 84 transitions, 198 flow. Second operand has 3 states, 3 states have (on average 145.66666666666666) internal successors, (437), 3 states have internal predecessors, (437), 0 states have call successors, (0), 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 18:46:02,642 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:46:02,642 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 145 of 341 [2023-08-26 18:46:02,642 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:46:04,303 INFO L124 PetriNetUnfolderBase]: 19020/29063 cut-off events. [2023-08-26 18:46:04,304 INFO L125 PetriNetUnfolderBase]: For 719/719 co-relation queries the response was YES. [2023-08-26 18:46:04,330 INFO L83 FinitePrefix]: Finished finitePrefix Result has 56519 conditions, 29063 events. 19020/29063 cut-off events. For 719/719 co-relation queries the response was YES. Maximal size of possible extension queue 943. Compared 212911 event pairs, 16947 based on Foata normal form. 6619/31666 useless extension candidates. Maximal degree in co-relation 10908. Up to 24786 conditions per place. [2023-08-26 18:46:04,416 INFO L140 encePairwiseOnDemand]: 315/341 looper letters, 40 selfloop transitions, 1 changer transitions 22/78 dead transitions. [2023-08-26 18:46:04,416 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 63 places, 78 transitions, 310 flow [2023-08-26 18:46:04,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:46:04,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:46:04,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 539 transitions. [2023-08-26 18:46:04,418 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5268817204301075 [2023-08-26 18:46:04,418 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 539 transitions. [2023-08-26 18:46:04,418 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 539 transitions. [2023-08-26 18:46:04,418 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:46:04,418 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 539 transitions. [2023-08-26 18:46:04,419 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 179.66666666666666) internal successors, (539), 3 states have internal predecessors, (539), 0 states have call successors, (0), 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 18:46:04,420 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 341.0) internal successors, (1364), 4 states have internal predecessors, (1364), 0 states have call successors, (0), 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 18:46:04,420 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 341.0) internal successors, (1364), 4 states have internal predecessors, (1364), 0 states have call successors, (0), 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 18:46:04,421 INFO L175 Difference]: Start difference. First operand has 65 places, 84 transitions, 198 flow. Second operand 3 states and 539 transitions. [2023-08-26 18:46:04,421 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 63 places, 78 transitions, 310 flow [2023-08-26 18:46:04,423 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 63 places, 78 transitions, 310 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:46:04,424 INFO L231 Difference]: Finished difference. Result has 63 places, 56 transitions, 138 flow [2023-08-26 18:46:04,424 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=341, PETRI_DIFFERENCE_MINUEND_FLOW=146, PETRI_DIFFERENCE_MINUEND_PLACES=61, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=58, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=57, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=138, PETRI_PLACES=63, PETRI_TRANSITIONS=56} [2023-08-26 18:46:04,425 INFO L281 CegarLoopForPetriNet]: 65 programPoint places, -2 predicate places. [2023-08-26 18:46:04,425 INFO L495 AbstractCegarLoop]: Abstraction has has 63 places, 56 transitions, 138 flow [2023-08-26 18:46:04,425 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 145.66666666666666) internal successors, (437), 3 states have internal predecessors, (437), 0 states have call successors, (0), 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 18:46:04,425 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:04,425 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:46:04,425 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 18:46:04,425 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:46:04,425 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:04,426 INFO L85 PathProgramCache]: Analyzing trace with hash 46804, now seen corresponding path program 1 times [2023-08-26 18:46:04,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:04,426 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057705861] [2023-08-26 18:46:04,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:04,426 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:04,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:04,455 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 18:46:04,455 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:46:04,455 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057705861] [2023-08-26 18:46:04,455 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1057705861] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:46:04,455 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:46:04,456 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:46:04,456 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812680928] [2023-08-26 18:46:04,456 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:46:04,456 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:46:04,456 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:46:04,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:46:04,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:46:04,457 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 140 out of 341 [2023-08-26 18:46:04,457 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 63 places, 56 transitions, 138 flow. Second operand has 3 states, 3 states have (on average 140.66666666666666) internal successors, (422), 3 states have internal predecessors, (422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:04,457 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:46:04,457 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 140 of 341 [2023-08-26 18:46:04,457 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:46:05,878 INFO L124 PetriNetUnfolderBase]: 17546/27171 cut-off events. [2023-08-26 18:46:05,878 INFO L125 PetriNetUnfolderBase]: For 740/740 co-relation queries the response was YES. [2023-08-26 18:46:05,900 INFO L83 FinitePrefix]: Finished finitePrefix Result has 52454 conditions, 27171 events. 17546/27171 cut-off events. For 740/740 co-relation queries the response was YES. Maximal size of possible extension queue 897. Compared 199929 event pairs, 11031 based on Foata normal form. 0/24009 useless extension candidates. Maximal degree in co-relation 52445. Up to 24769 conditions per place. [2023-08-26 18:46:05,975 INFO L140 encePairwiseOnDemand]: 336/341 looper letters, 47 selfloop transitions, 2 changer transitions 0/64 dead transitions. [2023-08-26 18:46:05,975 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 63 places, 64 transitions, 252 flow [2023-08-26 18:46:05,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:46:05,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:46:05,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 472 transitions. [2023-08-26 18:46:05,976 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4613880742913001 [2023-08-26 18:46:05,977 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 472 transitions. [2023-08-26 18:46:05,977 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 472 transitions. [2023-08-26 18:46:05,977 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:46:05,977 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 472 transitions. [2023-08-26 18:46:05,978 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 157.33333333333334) internal successors, (472), 3 states have internal predecessors, (472), 0 states have call successors, (0), 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 18:46:05,981 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 341.0) internal successors, (1364), 4 states have internal predecessors, (1364), 0 states have call successors, (0), 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 18:46:05,981 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 341.0) internal successors, (1364), 4 states have internal predecessors, (1364), 0 states have call successors, (0), 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 18:46:05,981 INFO L175 Difference]: Start difference. First operand has 63 places, 56 transitions, 138 flow. Second operand 3 states and 472 transitions. [2023-08-26 18:46:05,981 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 63 places, 64 transitions, 252 flow [2023-08-26 18:46:05,988 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 61 places, 64 transitions, 249 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:46:05,989 INFO L231 Difference]: Finished difference. Result has 62 places, 57 transitions, 151 flow [2023-08-26 18:46:05,989 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=341, PETRI_DIFFERENCE_MINUEND_FLOW=135, PETRI_DIFFERENCE_MINUEND_PLACES=59, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=56, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=54, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=151, PETRI_PLACES=62, PETRI_TRANSITIONS=57} [2023-08-26 18:46:05,990 INFO L281 CegarLoopForPetriNet]: 65 programPoint places, -3 predicate places. [2023-08-26 18:46:05,990 INFO L495 AbstractCegarLoop]: Abstraction has has 62 places, 57 transitions, 151 flow [2023-08-26 18:46:05,990 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 140.66666666666666) internal successors, (422), 3 states have internal predecessors, (422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:46:05,990 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:05,990 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:46:05,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-26 18:46:05,990 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:46:05,991 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:05,991 INFO L85 PathProgramCache]: Analyzing trace with hash 315886792, now seen corresponding path program 1 times [2023-08-26 18:46:05,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:05,991 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [854939751] [2023-08-26 18:46:05,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:05,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:05,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:06,043 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 18:46:06,043 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:46:06,043 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [854939751] [2023-08-26 18:46:06,043 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [854939751] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:46:06,043 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2076564820] [2023-08-26 18:46:06,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:06,043 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:46:06,043 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:46:06,044 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 18:46:06,046 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 18:46:06,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:06,100 INFO L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:46:06,100 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:46:06,106 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 18:46:06,131 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 18:46:06,132 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:46:06,160 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 18:46:06,160 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2076564820] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:46:06,161 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:46:06,161 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-08-26 18:46:06,161 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687061596] [2023-08-26 18:46:06,161 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:46:06,161 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-08-26 18:46:06,161 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:46:06,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-08-26 18:46:06,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-08-26 18:46:06,162 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 140 out of 341 [2023-08-26 18:46:06,163 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 62 places, 57 transitions, 151 flow. Second operand has 8 states, 8 states have (on average 141.875) internal successors, (1135), 8 states have internal predecessors, (1135), 0 states have call successors, (0), 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 18:46:06,163 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:46:06,163 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 140 of 341 [2023-08-26 18:46:06,163 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:46:07,477 INFO L124 PetriNetUnfolderBase]: 16232/23325 cut-off events. [2023-08-26 18:46:07,477 INFO L125 PetriNetUnfolderBase]: For 1026/1026 co-relation queries the response was YES. [2023-08-26 18:46:07,496 INFO L83 FinitePrefix]: Finished finitePrefix Result has 48206 conditions, 23325 events. 16232/23325 cut-off events. For 1026/1026 co-relation queries the response was YES. Maximal size of possible extension queue 745. Compared 159069 event pairs, 400 based on Foata normal form. 7/21648 useless extension candidates. Maximal degree in co-relation 48195. Up to 18024 conditions per place. [2023-08-26 18:46:07,564 INFO L140 encePairwiseOnDemand]: 336/341 looper letters, 98 selfloop transitions, 8 changer transitions 1/122 dead transitions. [2023-08-26 18:46:07,564 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 66 places, 122 transitions, 499 flow [2023-08-26 18:46:07,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:46:07,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:46:07,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 952 transitions. [2023-08-26 18:46:07,570 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.46529814271749753 [2023-08-26 18:46:07,570 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 952 transitions. [2023-08-26 18:46:07,570 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 952 transitions. [2023-08-26 18:46:07,570 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:46:07,570 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 952 transitions. [2023-08-26 18:46:07,575 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 158.66666666666666) internal successors, (952), 6 states have internal predecessors, (952), 0 states have call successors, (0), 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 18:46:07,578 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 341.0) internal successors, (2387), 7 states have internal predecessors, (2387), 0 states have call successors, (0), 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 18:46:07,578 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 341.0) internal successors, (2387), 7 states have internal predecessors, (2387), 0 states have call successors, (0), 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 18:46:07,578 INFO L175 Difference]: Start difference. First operand has 62 places, 57 transitions, 151 flow. Second operand 6 states and 952 transitions. [2023-08-26 18:46:07,578 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 66 places, 122 transitions, 499 flow [2023-08-26 18:46:07,580 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 65 places, 122 transitions, 497 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:46:07,582 INFO L231 Difference]: Finished difference. Result has 65 places, 59 transitions, 173 flow [2023-08-26 18:46:07,583 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=341, PETRI_DIFFERENCE_MINUEND_FLOW=145, PETRI_DIFFERENCE_MINUEND_PLACES=60, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=56, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=51, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=173, PETRI_PLACES=65, PETRI_TRANSITIONS=59} [2023-08-26 18:46:07,583 INFO L281 CegarLoopForPetriNet]: 65 programPoint places, 0 predicate places. [2023-08-26 18:46:07,583 INFO L495 AbstractCegarLoop]: Abstraction has has 65 places, 59 transitions, 173 flow [2023-08-26 18:46:07,584 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 141.875) internal successors, (1135), 8 states have internal predecessors, (1135), 0 states have call successors, (0), 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 18:46:07,584 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:07,584 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 18:46:07,590 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 18:46:07,788 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:46:07,789 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:46:07,789 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:07,789 INFO L85 PathProgramCache]: Analyzing trace with hash -177591904, now seen corresponding path program 1 times [2023-08-26 18:46:07,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:07,789 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248536153] [2023-08-26 18:46:07,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:07,789 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:07,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:07,861 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-08-26 18:46:07,861 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:46:07,862 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [248536153] [2023-08-26 18:46:07,862 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [248536153] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:46:07,862 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1457764401] [2023-08-26 18:46:07,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:07,862 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:46:07,862 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:46:07,863 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 18:46:07,865 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 18:46:07,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:07,927 INFO L262 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 4 conjunts are in the unsatisfiable core [2023-08-26 18:46:07,928 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:46:07,958 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:07,958 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:46:07,997 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:46:07,998 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1457764401] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:46:07,998 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:46:07,998 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 11 [2023-08-26 18:46:08,000 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72072195] [2023-08-26 18:46:08,000 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:46:08,000 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-08-26 18:46:08,000 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:46:08,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-08-26 18:46:08,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2023-08-26 18:46:08,002 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 134 out of 341 [2023-08-26 18:46:08,003 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 65 places, 59 transitions, 173 flow. Second operand has 12 states, 12 states have (on average 136.33333333333334) internal successors, (1636), 12 states have internal predecessors, (1636), 0 states have call successors, (0), 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 18:46:08,003 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:46:08,003 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 134 of 341 [2023-08-26 18:46:08,003 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:46:08,403 INFO L124 PetriNetUnfolderBase]: 3352/5486 cut-off events. [2023-08-26 18:46:08,403 INFO L125 PetriNetUnfolderBase]: For 2676/2676 co-relation queries the response was YES. [2023-08-26 18:46:08,409 INFO L83 FinitePrefix]: Finished finitePrefix Result has 11617 conditions, 5486 events. 3352/5486 cut-off events. For 2676/2676 co-relation queries the response was YES. Maximal size of possible extension queue 206. Compared 35305 event pairs, 355 based on Foata normal form. 504/5797 useless extension candidates. Maximal degree in co-relation 11605. Up to 3178 conditions per place. [2023-08-26 18:46:08,412 INFO L140 encePairwiseOnDemand]: 337/341 looper letters, 0 selfloop transitions, 0 changer transitions 85/85 dead transitions. [2023-08-26 18:46:08,413 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 59 places, 85 transitions, 343 flow [2023-08-26 18:46:08,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:46:08,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:46:08,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 879 transitions. [2023-08-26 18:46:08,415 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42961876832844575 [2023-08-26 18:46:08,415 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 879 transitions. [2023-08-26 18:46:08,415 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 879 transitions. [2023-08-26 18:46:08,416 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:46:08,416 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 879 transitions. [2023-08-26 18:46:08,417 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 146.5) internal successors, (879), 6 states have internal predecessors, (879), 0 states have call successors, (0), 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 18:46:08,419 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 341.0) internal successors, (2387), 7 states have internal predecessors, (2387), 0 states have call successors, (0), 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 18:46:08,420 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 341.0) internal successors, (2387), 7 states have internal predecessors, (2387), 0 states have call successors, (0), 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 18:46:08,420 INFO L175 Difference]: Start difference. First operand has 65 places, 59 transitions, 173 flow. Second operand 6 states and 879 transitions. [2023-08-26 18:46:08,420 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 59 places, 85 transitions, 343 flow [2023-08-26 18:46:08,421 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 56 places, 85 transitions, 332 flow, removed 3 selfloop flow, removed 3 redundant places. [2023-08-26 18:46:08,422 INFO L231 Difference]: Finished difference. Result has 56 places, 0 transitions, 0 flow [2023-08-26 18:46:08,422 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=341, PETRI_DIFFERENCE_MINUEND_FLOW=104, PETRI_DIFFERENCE_MINUEND_PLACES=51, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=42, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=42, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=0, PETRI_PLACES=56, PETRI_TRANSITIONS=0} [2023-08-26 18:46:08,422 INFO L281 CegarLoopForPetriNet]: 65 programPoint places, -9 predicate places. [2023-08-26 18:46:08,422 INFO L495 AbstractCegarLoop]: Abstraction has has 56 places, 0 transitions, 0 flow [2023-08-26 18:46:08,423 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 136.33333333333334) internal successors, (1636), 12 states have internal predecessors, (1636), 0 states have call successors, (0), 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 18:46:08,423 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 5 remaining) [2023-08-26 18:46:08,423 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 5 remaining) [2023-08-26 18:46:08,423 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 5 remaining) [2023-08-26 18:46:08,423 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 5 remaining) [2023-08-26 18:46:08,423 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 5 remaining) [2023-08-26 18:46:08,432 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 18:46:08,628 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:46:08,628 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 18:46:08,628 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:46:08,630 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:08,657 INFO L124 PetriNetUnfolderBase]: 66/438 cut-off events. [2023-08-26 18:46:08,657 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:46:08,658 INFO L83 FinitePrefix]: Finished finitePrefix Result has 466 conditions, 438 events. 66/438 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1528 event pairs, 1 based on Foata normal form. 0/340 useless extension candidates. Maximal degree in co-relation 300. Up to 16 conditions per place. [2023-08-26 18:46:08,658 INFO L82 GeneralOperation]: Start removeDead. Operand has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:08,660 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:08,660 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:46:08,660 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:08,660 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:08,660 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 168 places, 191 transitions, 412 flow [2023-08-26 18:46:08,685 INFO L124 PetriNetUnfolderBase]: 66/438 cut-off events. [2023-08-26 18:46:08,685 INFO L125 PetriNetUnfolderBase]: For 19/19 co-relation queries the response was YES. [2023-08-26 18:46:08,686 INFO L83 FinitePrefix]: Finished finitePrefix Result has 466 conditions, 438 events. 66/438 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 1528 event pairs, 1 based on Foata normal form. 0/340 useless extension candidates. Maximal degree in co-relation 300. Up to 16 conditions per place. [2023-08-26 18:46:08,690 INFO L119 LiptonReduction]: Number of co-enabled transitions 15624 [2023-08-26 18:46:11,201 INFO L134 LiptonReduction]: Checked pairs total: 38751 [2023-08-26 18:46:11,201 INFO L136 LiptonReduction]: Total number of compositions: 147 [2023-08-26 18:46:11,202 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:46:11,202 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;@7a2f1a0a, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:46:11,202 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:46:11,209 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:46:11,209 INFO L124 PetriNetUnfolderBase]: 29/123 cut-off events. [2023-08-26 18:46:11,209 INFO L125 PetriNetUnfolderBase]: For 10/10 co-relation queries the response was YES. [2023-08-26 18:46:11,209 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:11,209 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1] [2023-08-26 18:46:11,209 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:46:11,210 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:11,211 INFO L85 PathProgramCache]: Analyzing trace with hash -451556412, now seen corresponding path program 1 times [2023-08-26 18:46:11,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:11,211 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [963394765] [2023-08-26 18:46:11,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:11,211 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:11,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:46:11,220 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:46:11,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:46:11,238 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:46:11,238 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:46:11,238 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:46:11,238 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-08-26 18:46:11,238 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:46:11,239 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:46:11,239 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:46:11,240 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 18:46:11,257 INFO L144 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2023-08-26 18:46:11,315 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 193 places, 221 transitions, 486 flow [2023-08-26 18:46:11,353 INFO L124 PetriNetUnfolderBase]: 101/660 cut-off events. [2023-08-26 18:46:11,353 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:46:11,355 INFO L83 FinitePrefix]: Finished finitePrefix Result has 715 conditions, 660 events. 101/660 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2670 event pairs, 6 based on Foata normal form. 0/512 useless extension candidates. Maximal degree in co-relation 458. Up to 32 conditions per place. [2023-08-26 18:46:11,355 INFO L82 GeneralOperation]: Start removeDead. Operand has 193 places, 221 transitions, 486 flow [2023-08-26 18:46:11,357 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 193 places, 221 transitions, 486 flow [2023-08-26 18:46:11,357 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:46:11,357 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 193 places, 221 transitions, 486 flow [2023-08-26 18:46:11,358 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 193 places, 221 transitions, 486 flow [2023-08-26 18:46:11,358 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 193 places, 221 transitions, 486 flow [2023-08-26 18:46:11,392 INFO L124 PetriNetUnfolderBase]: 101/660 cut-off events. [2023-08-26 18:46:11,392 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:46:11,394 INFO L83 FinitePrefix]: Finished finitePrefix Result has 715 conditions, 660 events. 101/660 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2670 event pairs, 6 based on Foata normal form. 0/512 useless extension candidates. Maximal degree in co-relation 458. Up to 32 conditions per place. [2023-08-26 18:46:11,402 INFO L119 LiptonReduction]: Number of co-enabled transitions 24304 [2023-08-26 18:46:14,148 INFO L134 LiptonReduction]: Checked pairs total: 71717 [2023-08-26 18:46:14,149 INFO L136 LiptonReduction]: Total number of compositions: 162 [2023-08-26 18:46:14,149 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:46:14,150 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;@7a2f1a0a, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:46:14,150 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:46:14,150 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:46:14,151 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:46:14,151 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:46:14,151 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:14,151 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:46:14,151 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:46:14,151 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:14,151 INFO L85 PathProgramCache]: Analyzing trace with hash 64720, now seen corresponding path program 1 times [2023-08-26 18:46:14,151 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:14,151 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198426769] [2023-08-26 18:46:14,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:14,151 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:14,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:14,176 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 18:46:14,176 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:46:14,176 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198426769] [2023-08-26 18:46:14,176 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [198426769] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:46:14,176 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:46:14,177 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:46:14,177 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135480824] [2023-08-26 18:46:14,177 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:46:14,177 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:46:14,177 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:46:14,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:46:14,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:46:14,178 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 162 out of 383 [2023-08-26 18:46:14,178 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 79 places, 103 transitions, 250 flow. Second operand has 3 states, 3 states have (on average 162.66666666666666) internal successors, (488), 3 states have internal predecessors, (488), 0 states have call successors, (0), 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 18:46:14,178 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:46:14,178 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 162 of 383 [2023-08-26 18:46:14,178 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:46:47,751 INFO L124 PetriNetUnfolderBase]: 423266/586220 cut-off events. [2023-08-26 18:46:47,751 INFO L125 PetriNetUnfolderBase]: For 14778/14778 co-relation queries the response was YES. [2023-08-26 18:46:48,514 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1144804 conditions, 586220 events. 423266/586220 cut-off events. For 14778/14778 co-relation queries the response was YES. Maximal size of possible extension queue 12905. Compared 4764516 event pairs, 307598 based on Foata normal form. 101616/615680 useless extension candidates. Maximal degree in co-relation 100121. Up to 550266 conditions per place. [2023-08-26 18:46:50,189 INFO L140 encePairwiseOnDemand]: 350/383 looper letters, 65 selfloop transitions, 2 changer transitions 3/85 dead transitions. [2023-08-26 18:46:50,189 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 80 places, 85 transitions, 352 flow [2023-08-26 18:46:50,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:46:50,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:46:50,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 592 transitions. [2023-08-26 18:46:50,191 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.515230635335074 [2023-08-26 18:46:50,191 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 592 transitions. [2023-08-26 18:46:50,191 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 592 transitions. [2023-08-26 18:46:50,191 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:46:50,191 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 592 transitions. [2023-08-26 18:46:50,192 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 197.33333333333334) internal successors, (592), 3 states have internal predecessors, (592), 0 states have call successors, (0), 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 18:46:50,195 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 383.0) internal successors, (1532), 4 states have internal predecessors, (1532), 0 states have call successors, (0), 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 18:46:50,195 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 383.0) internal successors, (1532), 4 states have internal predecessors, (1532), 0 states have call successors, (0), 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 18:46:50,195 INFO L175 Difference]: Start difference. First operand has 79 places, 103 transitions, 250 flow. Second operand 3 states and 592 transitions. [2023-08-26 18:46:50,195 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 80 places, 85 transitions, 352 flow [2023-08-26 18:46:50,197 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 80 places, 85 transitions, 352 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:46:50,198 INFO L231 Difference]: Finished difference. Result has 81 places, 72 transitions, 194 flow [2023-08-26 18:46:50,198 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=383, PETRI_DIFFERENCE_MINUEND_FLOW=192, PETRI_DIFFERENCE_MINUEND_PLACES=78, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=74, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=72, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=194, PETRI_PLACES=81, PETRI_TRANSITIONS=72} [2023-08-26 18:46:50,199 INFO L281 CegarLoopForPetriNet]: 79 programPoint places, 2 predicate places. [2023-08-26 18:46:50,199 INFO L495 AbstractCegarLoop]: Abstraction has has 81 places, 72 transitions, 194 flow [2023-08-26 18:46:50,199 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 162.66666666666666) internal successors, (488), 3 states have internal predecessors, (488), 0 states have call successors, (0), 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 18:46:50,199 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:46:50,199 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:46:50,199 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-08-26 18:46:50,199 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:46:50,200 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:46:50,200 INFO L85 PathProgramCache]: Analyzing trace with hash 64721, now seen corresponding path program 1 times [2023-08-26 18:46:50,200 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:46:50,200 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [328637744] [2023-08-26 18:46:50,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:46:50,200 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:46:50,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:46:50,230 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 18:46:50,230 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:46:50,230 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [328637744] [2023-08-26 18:46:50,230 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [328637744] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:46:50,230 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:46:50,230 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:46:50,230 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077123920] [2023-08-26 18:46:50,231 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:46:50,231 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:46:50,231 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:46:50,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:46:50,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:46:50,232 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 167 out of 383 [2023-08-26 18:46:50,232 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 81 places, 72 transitions, 194 flow. Second operand has 3 states, 3 states have (on average 167.66666666666666) internal successors, (503), 3 states have internal predecessors, (503), 0 states have call successors, (0), 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 18:46:50,232 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:46:50,232 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 167 of 383 [2023-08-26 18:46:50,232 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:47:15,682 INFO L124 PetriNetUnfolderBase]: 321014/444386 cut-off events. [2023-08-26 18:47:15,682 INFO L125 PetriNetUnfolderBase]: For 26140/26140 co-relation queries the response was YES. [2023-08-26 18:47:16,384 INFO L83 FinitePrefix]: Finished finitePrefix Result has 894861 conditions, 444386 events. 321014/444386 cut-off events. For 26140/26140 co-relation queries the response was YES. Maximal size of possible extension queue 9871. Compared 3509125 event pairs, 313434 based on Foata normal form. 0/411112 useless extension candidates. Maximal degree in co-relation 894788. Up to 416884 conditions per place. [2023-08-26 18:47:17,974 INFO L140 encePairwiseOnDemand]: 380/383 looper letters, 54 selfloop transitions, 1 changer transitions 0/70 dead transitions. [2023-08-26 18:47:17,974 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 78 places, 70 transitions, 300 flow [2023-08-26 18:47:17,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:47:17,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:47:17,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 557 transitions. [2023-08-26 18:47:17,990 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48476936466492604 [2023-08-26 18:47:17,991 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 557 transitions. [2023-08-26 18:47:17,991 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 557 transitions. [2023-08-26 18:47:17,991 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:47:17,991 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 557 transitions. [2023-08-26 18:47:17,992 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 185.66666666666666) internal successors, (557), 3 states have internal predecessors, (557), 0 states have call successors, (0), 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 18:47:17,994 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 383.0) internal successors, (1532), 4 states have internal predecessors, (1532), 0 states have call successors, (0), 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 18:47:17,994 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 383.0) internal successors, (1532), 4 states have internal predecessors, (1532), 0 states have call successors, (0), 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 18:47:17,994 INFO L175 Difference]: Start difference. First operand has 81 places, 72 transitions, 194 flow. Second operand 3 states and 557 transitions. [2023-08-26 18:47:17,994 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 78 places, 70 transitions, 300 flow [2023-08-26 18:47:18,063 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 76 places, 70 transitions, 296 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:47:18,066 INFO L231 Difference]: Finished difference. Result has 76 places, 70 transitions, 188 flow [2023-08-26 18:47:18,066 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=383, PETRI_DIFFERENCE_MINUEND_FLOW=186, PETRI_DIFFERENCE_MINUEND_PLACES=74, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=70, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=69, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=188, PETRI_PLACES=76, PETRI_TRANSITIONS=70} [2023-08-26 18:47:18,067 INFO L281 CegarLoopForPetriNet]: 79 programPoint places, -3 predicate places. [2023-08-26 18:47:18,067 INFO L495 AbstractCegarLoop]: Abstraction has has 76 places, 70 transitions, 188 flow [2023-08-26 18:47:18,067 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 167.66666666666666) internal successors, (503), 3 states have internal predecessors, (503), 0 states have call successors, (0), 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 18:47:18,067 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:47:18,067 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2023-08-26 18:47:18,067 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-08-26 18:47:18,067 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:47:18,067 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:47:18,068 INFO L85 PathProgramCache]: Analyzing trace with hash -301398494, now seen corresponding path program 1 times [2023-08-26 18:47:18,068 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:47:18,068 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346244721] [2023-08-26 18:47:18,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:47:18,068 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:47:18,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:47:18,132 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 18:47:18,132 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:47:18,132 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346244721] [2023-08-26 18:47:18,132 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [346244721] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:47:18,132 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1541006483] [2023-08-26 18:47:18,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:47:18,132 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:47:18,132 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:47:18,135 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 18:47:18,135 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 18:47:18,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:47:18,203 INFO L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 9 conjunts are in the unsatisfiable core [2023-08-26 18:47:18,204 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:47:18,210 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 18:47:18,233 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 18:47:18,233 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:47:18,259 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 18:47:18,259 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1541006483] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:47:18,259 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:47:18,259 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 5 [2023-08-26 18:47:18,259 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611280917] [2023-08-26 18:47:18,259 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:47:18,260 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-08-26 18:47:18,260 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:47:18,260 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-08-26 18:47:18,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2023-08-26 18:47:18,261 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 162 out of 383 [2023-08-26 18:47:18,262 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 76 places, 70 transitions, 188 flow. Second operand has 7 states, 7 states have (on average 163.71428571428572) internal successors, (1146), 7 states have internal predecessors, (1146), 0 states have call successors, (0), 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 18:47:18,262 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:47:18,262 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 162 of 383 [2023-08-26 18:47:18,262 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:47:40,304 INFO L124 PetriNetUnfolderBase]: 319077/422289 cut-off events. [2023-08-26 18:47:40,305 INFO L125 PetriNetUnfolderBase]: For 13529/13529 co-relation queries the response was YES. [2023-08-26 18:47:40,903 INFO L83 FinitePrefix]: Finished finitePrefix Result has 868623 conditions, 422289 events. 319077/422289 cut-off events. For 13529/13529 co-relation queries the response was YES. Maximal size of possible extension queue 9260. Compared 3129637 event pairs, 5515 based on Foata normal form. 9/394341 useless extension candidates. Maximal degree in co-relation 868611. Up to 359184 conditions per place. [2023-08-26 18:47:42,187 INFO L140 encePairwiseOnDemand]: 377/383 looper letters, 133 selfloop transitions, 9 changer transitions 1/158 dead transitions. [2023-08-26 18:47:42,188 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 81 places, 158 transitions, 662 flow [2023-08-26 18:47:42,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-08-26 18:47:42,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2023-08-26 18:47:42,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 1120 transitions. [2023-08-26 18:47:42,190 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.48738033072236725 [2023-08-26 18:47:42,190 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 1120 transitions. [2023-08-26 18:47:42,190 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 1120 transitions. [2023-08-26 18:47:42,191 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:47:42,191 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 1120 transitions. [2023-08-26 18:47:42,192 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 186.66666666666666) internal successors, (1120), 6 states have internal predecessors, (1120), 0 states have call successors, (0), 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 18:47:42,194 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 383.0) internal successors, (2681), 7 states have internal predecessors, (2681), 0 states have call successors, (0), 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 18:47:42,195 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 383.0) internal successors, (2681), 7 states have internal predecessors, (2681), 0 states have call successors, (0), 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 18:47:42,195 INFO L175 Difference]: Start difference. First operand has 76 places, 70 transitions, 188 flow. Second operand 6 states and 1120 transitions. [2023-08-26 18:47:42,195 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 81 places, 158 transitions, 662 flow [2023-08-26 18:47:42,199 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 80 places, 158 transitions, 661 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:47:42,200 INFO L231 Difference]: Finished difference. Result has 84 places, 76 transitions, 257 flow [2023-08-26 18:47:42,201 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=383, PETRI_DIFFERENCE_MINUEND_FLOW=187, PETRI_DIFFERENCE_MINUEND_PLACES=75, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=70, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=65, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=257, PETRI_PLACES=84, PETRI_TRANSITIONS=76} [2023-08-26 18:47:42,202 INFO L281 CegarLoopForPetriNet]: 79 programPoint places, 5 predicate places. [2023-08-26 18:47:42,202 INFO L495 AbstractCegarLoop]: Abstraction has has 84 places, 76 transitions, 257 flow [2023-08-26 18:47:42,202 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 163.71428571428572) internal successors, (1146), 7 states have internal predecessors, (1146), 0 states have call successors, (0), 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 18:47:42,202 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:47:42,202 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 18:47:42,206 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 18:47:42,403 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,SelfDestructingSolverStorable15 [2023-08-26 18:47:42,403 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:47:42,403 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:47:42,403 INFO L85 PathProgramCache]: Analyzing trace with hash -479018419, now seen corresponding path program 1 times [2023-08-26 18:47:42,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:47:42,403 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1498262532] [2023-08-26 18:47:42,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:47:42,404 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:47:42,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:47:42,456 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-08-26 18:47:42,456 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:47:42,456 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1498262532] [2023-08-26 18:47:42,456 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1498262532] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:47:42,457 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:47:42,457 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:47:42,457 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403666268] [2023-08-26 18:47:42,457 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:47:42,457 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-08-26 18:47:42,457 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:47:42,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-08-26 18:47:42,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-08-26 18:47:42,458 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 162 out of 383 [2023-08-26 18:47:42,458 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 84 places, 76 transitions, 257 flow. Second operand has 4 states, 4 states have (on average 164.0) internal successors, (656), 4 states have internal predecessors, (656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:47:42,458 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:47:42,458 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 162 of 383 [2023-08-26 18:47:42,458 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:48:06,430 INFO L124 PetriNetUnfolderBase]: 281421/383522 cut-off events. [2023-08-26 18:48:06,431 INFO L125 PetriNetUnfolderBase]: For 127129/127129 co-relation queries the response was YES. [2023-08-26 18:48:07,252 INFO L83 FinitePrefix]: Finished finitePrefix Result has 828431 conditions, 383522 events. 281421/383522 cut-off events. For 127129/127129 co-relation queries the response was YES. Maximal size of possible extension queue 8358. Compared 2918441 event pairs, 221543 based on Foata normal form. 0/363605 useless extension candidates. Maximal degree in co-relation 828414. Up to 291386 conditions per place. [2023-08-26 18:48:08,600 INFO L140 encePairwiseOnDemand]: 378/383 looper letters, 94 selfloop transitions, 4 changer transitions 0/113 dead transitions. [2023-08-26 18:48:08,600 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 87 places, 113 transitions, 538 flow [2023-08-26 18:48:08,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-08-26 18:48:08,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2023-08-26 18:48:08,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 740 transitions. [2023-08-26 18:48:08,602 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4830287206266319 [2023-08-26 18:48:08,602 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 740 transitions. [2023-08-26 18:48:08,602 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 740 transitions. [2023-08-26 18:48:08,603 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:48:08,603 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 740 transitions. [2023-08-26 18:48:08,604 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 185.0) internal successors, (740), 4 states have internal predecessors, (740), 0 states have call successors, (0), 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 18:48:08,605 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 383.0) internal successors, (1915), 5 states have internal predecessors, (1915), 0 states have call successors, (0), 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 18:48:08,606 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 383.0) internal successors, (1915), 5 states have internal predecessors, (1915), 0 states have call successors, (0), 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 18:48:08,606 INFO L175 Difference]: Start difference. First operand has 84 places, 76 transitions, 257 flow. Second operand 4 states and 740 transitions. [2023-08-26 18:48:08,606 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 87 places, 113 transitions, 538 flow [2023-08-26 18:48:08,663 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 85 places, 113 transitions, 519 flow, removed 7 selfloop flow, removed 2 redundant places. [2023-08-26 18:48:08,664 INFO L231 Difference]: Finished difference. Result has 86 places, 77 transitions, 256 flow [2023-08-26 18:48:08,664 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=383, PETRI_DIFFERENCE_MINUEND_FLOW=239, PETRI_DIFFERENCE_MINUEND_PLACES=82, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=76, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=72, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=256, PETRI_PLACES=86, PETRI_TRANSITIONS=77} [2023-08-26 18:48:08,665 INFO L281 CegarLoopForPetriNet]: 79 programPoint places, 7 predicate places. [2023-08-26 18:48:08,665 INFO L495 AbstractCegarLoop]: Abstraction has has 86 places, 77 transitions, 256 flow [2023-08-26 18:48:08,665 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 164.0) internal successors, (656), 4 states have internal predecessors, (656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:48:08,665 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:48:08,665 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-08-26 18:48:08,665 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-08-26 18:48:08,665 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:48:08,666 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:48:08,666 INFO L85 PathProgramCache]: Analyzing trace with hash -479020479, now seen corresponding path program 1 times [2023-08-26 18:48:08,666 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:48:08,666 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2061983755] [2023-08-26 18:48:08,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:48:08,666 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:48:08,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:48:08,700 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-08-26 18:48:08,700 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:48:08,700 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2061983755] [2023-08-26 18:48:08,700 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2061983755] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:48:08,701 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:48:08,701 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:48:08,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797190221] [2023-08-26 18:48:08,701 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:48:08,701 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:48:08,701 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:48:08,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:48:08,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:48:08,702 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 164 out of 383 [2023-08-26 18:48:08,702 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 86 places, 77 transitions, 256 flow. Second operand has 3 states, 3 states have (on average 166.66666666666666) internal successors, (500), 3 states have internal predecessors, (500), 0 states have call successors, (0), 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 18:48:08,702 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:48:08,702 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 164 of 383 [2023-08-26 18:48:08,702 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:48:46,210 INFO L124 PetriNetUnfolderBase]: 516237/672389 cut-off events. [2023-08-26 18:48:46,210 INFO L125 PetriNetUnfolderBase]: For 277098/277098 co-relation queries the response was YES. [2023-08-26 18:48:47,703 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1504524 conditions, 672389 events. 516237/672389 cut-off events. For 277098/277098 co-relation queries the response was YES. Maximal size of possible extension queue 12291. Compared 4614526 event pairs, 244354 based on Foata normal form. 0/648380 useless extension candidates. Maximal degree in co-relation 1504506. Up to 660963 conditions per place. [2023-08-26 18:48:50,301 INFO L140 encePairwiseOnDemand]: 377/383 looper letters, 98 selfloop transitions, 5 changer transitions 0/112 dead transitions. [2023-08-26 18:48:50,309 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 88 places, 112 transitions, 607 flow [2023-08-26 18:48:50,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:48:50,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:48:50,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 581 transitions. [2023-08-26 18:48:50,310 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5056570931244561 [2023-08-26 18:48:50,310 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 581 transitions. [2023-08-26 18:48:50,310 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 581 transitions. [2023-08-26 18:48:50,322 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:48:50,323 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 581 transitions. [2023-08-26 18:48:50,324 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 193.66666666666666) internal successors, (581), 3 states have internal predecessors, (581), 0 states have call successors, (0), 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 18:48:50,325 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 383.0) internal successors, (1532), 4 states have internal predecessors, (1532), 0 states have call successors, (0), 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 18:48:50,325 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 383.0) internal successors, (1532), 4 states have internal predecessors, (1532), 0 states have call successors, (0), 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 18:48:50,325 INFO L175 Difference]: Start difference. First operand has 86 places, 77 transitions, 256 flow. Second operand 3 states and 581 transitions. [2023-08-26 18:48:50,325 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 88 places, 112 transitions, 607 flow [2023-08-26 18:48:57,958 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 86 places, 112 transitions, 600 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:48:57,959 INFO L231 Difference]: Finished difference. Result has 87 places, 81 transitions, 284 flow [2023-08-26 18:48:57,959 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=383, PETRI_DIFFERENCE_MINUEND_FLOW=251, PETRI_DIFFERENCE_MINUEND_PLACES=84, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=77, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=72, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=284, PETRI_PLACES=87, PETRI_TRANSITIONS=81} [2023-08-26 18:48:57,959 INFO L281 CegarLoopForPetriNet]: 79 programPoint places, 8 predicate places. [2023-08-26 18:48:57,960 INFO L495 AbstractCegarLoop]: Abstraction has has 87 places, 81 transitions, 284 flow [2023-08-26 18:48:57,960 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 166.66666666666666) internal successors, (500), 3 states have internal predecessors, (500), 0 states have call successors, (0), 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 18:48:57,960 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:48:57,960 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:48:57,960 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-08-26 18:48:57,960 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:48:57,960 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:48:57,961 INFO L85 PathProgramCache]: Analyzing trace with hash -1636466249, now seen corresponding path program 1 times [2023-08-26 18:48:57,961 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:48:57,961 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648764836] [2023-08-26 18:48:57,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:48:57,961 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:48:57,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:48:58,026 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:48:58,027 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:48:58,027 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648764836] [2023-08-26 18:48:58,027 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [648764836] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:48:58,027 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1201558658] [2023-08-26 18:48:58,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:48:58,027 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:48:58,027 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:48:58,029 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 18:48:58,030 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 18:48:58,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:48:58,103 INFO L262 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 4 conjunts are in the unsatisfiable core [2023-08-26 18:48:58,104 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:48:58,119 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:48:58,120 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:48:58,153 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:48:58,154 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1201558658] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:48:58,154 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:48:58,154 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2023-08-26 18:48:58,155 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114139403] [2023-08-26 18:48:58,155 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:48:58,155 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-08-26 18:48:58,156 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:48:58,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-08-26 18:48:58,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2023-08-26 18:48:58,157 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 173 out of 383 [2023-08-26 18:48:58,158 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 87 places, 81 transitions, 284 flow. Second operand has 9 states, 9 states have (on average 176.0) internal successors, (1584), 9 states have internal predecessors, (1584), 0 states have call successors, (0), 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 18:48:58,158 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:48:58,158 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 173 of 383 [2023-08-26 18:48:58,158 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:02,987 INFO L124 PetriNetUnfolderBase]: 61747/84496 cut-off events. [2023-08-26 18:49:02,988 INFO L125 PetriNetUnfolderBase]: For 47899/47899 co-relation queries the response was YES. [2023-08-26 18:49:03,166 INFO L83 FinitePrefix]: Finished finitePrefix Result has 215301 conditions, 84496 events. 61747/84496 cut-off events. For 47899/47899 co-relation queries the response was YES. Maximal size of possible extension queue 2179. Compared 566274 event pairs, 0 based on Foata normal form. 6561/91056 useless extension candidates. Maximal degree in co-relation 215288. Up to 52974 conditions per place. [2023-08-26 18:49:03,418 INFO L140 encePairwiseOnDemand]: 379/383 looper letters, 131 selfloop transitions, 5 changer transitions 0/150 dead transitions. [2023-08-26 18:49:03,419 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 81 places, 150 transitions, 702 flow [2023-08-26 18:49:03,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 18:49:03,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 18:49:03,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1340 transitions. [2023-08-26 18:49:03,421 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4998135024244685 [2023-08-26 18:49:03,421 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1340 transitions. [2023-08-26 18:49:03,421 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1340 transitions. [2023-08-26 18:49:03,422 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:03,422 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1340 transitions. [2023-08-26 18:49:03,424 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 191.42857142857142) internal successors, (1340), 7 states have internal predecessors, (1340), 0 states have call successors, (0), 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 18:49:03,426 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 383.0) internal successors, (3064), 8 states have internal predecessors, (3064), 0 states have call successors, (0), 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 18:49:03,426 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 383.0) internal successors, (3064), 8 states have internal predecessors, (3064), 0 states have call successors, (0), 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 18:49:03,426 INFO L175 Difference]: Start difference. First operand has 87 places, 81 transitions, 284 flow. Second operand 7 states and 1340 transitions. [2023-08-26 18:49:03,426 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 81 places, 150 transitions, 702 flow [2023-08-26 18:49:03,442 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 79 places, 150 transitions, 679 flow, removed 3 selfloop flow, removed 2 redundant places. [2023-08-26 18:49:03,443 INFO L231 Difference]: Finished difference. Result has 79 places, 60 transitions, 193 flow [2023-08-26 18:49:03,443 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=383, PETRI_DIFFERENCE_MINUEND_FLOW=183, PETRI_DIFFERENCE_MINUEND_PLACES=73, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=60, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=55, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=193, PETRI_PLACES=79, PETRI_TRANSITIONS=60} [2023-08-26 18:49:03,443 INFO L281 CegarLoopForPetriNet]: 79 programPoint places, 0 predicate places. [2023-08-26 18:49:03,443 INFO L495 AbstractCegarLoop]: Abstraction has has 79 places, 60 transitions, 193 flow [2023-08-26 18:49:03,444 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 176.0) internal successors, (1584), 9 states have internal predecessors, (1584), 0 states have call successors, (0), 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 18:49:03,444 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:03,444 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1] [2023-08-26 18:49:03,451 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 18:49:03,647 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:49:03,648 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:49:03,648 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:03,648 INFO L85 PathProgramCache]: Analyzing trace with hash 1643292754, now seen corresponding path program 1 times [2023-08-26 18:49:03,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:03,648 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1642886428] [2023-08-26 18:49:03,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:03,648 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:03,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:03,912 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:03,912 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:03,912 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1642886428] [2023-08-26 18:49:03,912 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1642886428] provided 0 perfect and 1 imperfect interpolant sequences [2023-08-26 18:49:03,912 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1377679566] [2023-08-26 18:49:03,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:03,912 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:49:03,912 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:49:03,913 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 18:49:03,915 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 18:49:03,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:03,982 INFO L262 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 15 conjunts are in the unsatisfiable core [2023-08-26 18:49:03,983 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-08-26 18:49:03,986 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 18:49:04,081 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:04,081 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-08-26 18:49:04,171 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:49:04,172 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1377679566] provided 0 perfect and 2 imperfect interpolant sequences [2023-08-26 18:49:04,172 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-08-26 18:49:04,172 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 14 [2023-08-26 18:49:04,172 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451643577] [2023-08-26 18:49:04,172 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-08-26 18:49:04,172 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-08-26 18:49:04,172 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:04,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-08-26 18:49:04,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2023-08-26 18:49:04,174 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 162 out of 383 [2023-08-26 18:49:04,175 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 79 places, 60 transitions, 193 flow. Second operand has 16 states, 16 states have (on average 164.4375) internal successors, (2631), 16 states have internal predecessors, (2631), 0 states have call successors, (0), 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 18:49:04,175 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:04,176 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 162 of 383 [2023-08-26 18:49:04,176 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:49:07,575 INFO L124 PetriNetUnfolderBase]: 41092/57397 cut-off events. [2023-08-26 18:49:07,575 INFO L125 PetriNetUnfolderBase]: For 63283/63289 co-relation queries the response was YES. [2023-08-26 18:49:07,681 INFO L83 FinitePrefix]: Finished finitePrefix Result has 134649 conditions, 57397 events. 41092/57397 cut-off events. For 63283/63289 co-relation queries the response was YES. Maximal size of possible extension queue 1542. Compared 379349 event pairs, 2172 based on Foata normal form. 5832/63213 useless extension candidates. Maximal degree in co-relation 134637. Up to 26487 conditions per place. [2023-08-26 18:49:07,710 INFO L140 encePairwiseOnDemand]: 380/383 looper letters, 0 selfloop transitions, 0 changer transitions 149/149 dead transitions. [2023-08-26 18:49:07,710 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 84 places, 149 transitions, 677 flow [2023-08-26 18:49:07,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-08-26 18:49:07,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2023-08-26 18:49:07,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 1257 transitions. [2023-08-26 18:49:07,712 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4688549048862365 [2023-08-26 18:49:07,712 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 1257 transitions. [2023-08-26 18:49:07,712 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 1257 transitions. [2023-08-26 18:49:07,713 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:49:07,713 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 1257 transitions. [2023-08-26 18:49:07,714 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 179.57142857142858) internal successors, (1257), 7 states have internal predecessors, (1257), 0 states have call successors, (0), 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 18:49:07,716 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 383.0) internal successors, (3064), 8 states have internal predecessors, (3064), 0 states have call successors, (0), 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 18:49:07,717 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 383.0) internal successors, (3064), 8 states have internal predecessors, (3064), 0 states have call successors, (0), 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 18:49:07,717 INFO L175 Difference]: Start difference. First operand has 79 places, 60 transitions, 193 flow. Second operand 7 states and 1257 transitions. [2023-08-26 18:49:07,717 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 84 places, 149 transitions, 677 flow [2023-08-26 18:49:07,723 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 75 places, 149 transitions, 660 flow, removed 0 selfloop flow, removed 9 redundant places. [2023-08-26 18:49:07,724 INFO L231 Difference]: Finished difference. Result has 75 places, 0 transitions, 0 flow [2023-08-26 18:49:07,724 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=383, PETRI_DIFFERENCE_MINUEND_FLOW=166, PETRI_DIFFERENCE_MINUEND_PLACES=69, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=59, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=59, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=0, PETRI_PLACES=75, PETRI_TRANSITIONS=0} [2023-08-26 18:49:07,724 INFO L281 CegarLoopForPetriNet]: 79 programPoint places, -4 predicate places. [2023-08-26 18:49:07,724 INFO L495 AbstractCegarLoop]: Abstraction has has 75 places, 0 transitions, 0 flow [2023-08-26 18:49:07,725 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 164.4375) internal successors, (2631), 16 states have internal predecessors, (2631), 0 states have call successors, (0), 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 18:49:07,725 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 5 remaining) [2023-08-26 18:49:07,725 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONASSERT (3 of 5 remaining) [2023-08-26 18:49:07,725 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 5 remaining) [2023-08-26 18:49:07,726 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 5 remaining) [2023-08-26 18:49:07,726 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 5 remaining) [2023-08-26 18:49:07,732 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-08-26 18:49:07,930 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-08-26 18:49:07,930 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:49:07,930 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:49:07,931 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 193 places, 221 transitions, 486 flow [2023-08-26 18:49:07,967 INFO L124 PetriNetUnfolderBase]: 101/660 cut-off events. [2023-08-26 18:49:07,967 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:49:07,968 INFO L83 FinitePrefix]: Finished finitePrefix Result has 715 conditions, 660 events. 101/660 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2670 event pairs, 6 based on Foata normal form. 0/512 useless extension candidates. Maximal degree in co-relation 458. Up to 32 conditions per place. [2023-08-26 18:49:07,968 INFO L82 GeneralOperation]: Start removeDead. Operand has 193 places, 221 transitions, 486 flow [2023-08-26 18:49:07,970 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 193 places, 221 transitions, 486 flow [2023-08-26 18:49:07,970 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:49:07,970 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 193 places, 221 transitions, 486 flow [2023-08-26 18:49:07,970 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 193 places, 221 transitions, 486 flow [2023-08-26 18:49:07,970 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 193 places, 221 transitions, 486 flow [2023-08-26 18:49:08,005 INFO L124 PetriNetUnfolderBase]: 101/660 cut-off events. [2023-08-26 18:49:08,005 INFO L125 PetriNetUnfolderBase]: For 48/48 co-relation queries the response was YES. [2023-08-26 18:49:08,007 INFO L83 FinitePrefix]: Finished finitePrefix Result has 715 conditions, 660 events. 101/660 cut-off events. For 48/48 co-relation queries the response was YES. Maximal size of possible extension queue 15. Compared 2670 event pairs, 6 based on Foata normal form. 0/512 useless extension candidates. Maximal degree in co-relation 458. Up to 32 conditions per place. [2023-08-26 18:49:08,014 INFO L119 LiptonReduction]: Number of co-enabled transitions 24304 [2023-08-26 18:49:10,679 INFO L134 LiptonReduction]: Checked pairs total: 70782 [2023-08-26 18:49:10,679 INFO L136 LiptonReduction]: Total number of compositions: 165 [2023-08-26 18:49:10,680 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:49:10,680 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;@7a2f1a0a, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:49:10,680 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:49:10,688 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:49:10,688 INFO L124 PetriNetUnfolderBase]: 44/179 cut-off events. [2023-08-26 18:49:10,688 INFO L125 PetriNetUnfolderBase]: For 23/23 co-relation queries the response was YES. [2023-08-26 18:49:10,688 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:10,688 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2023-08-26 18:49:10,688 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:49:10,688 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:10,688 INFO L85 PathProgramCache]: Analyzing trace with hash 464874835, now seen corresponding path program 1 times [2023-08-26 18:49:10,688 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:10,688 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320042240] [2023-08-26 18:49:10,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:10,688 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:10,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:49:10,711 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:49:10,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:49:10,719 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:49:10,719 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:49:10,719 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:49:10,720 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2023-08-26 18:49:10,720 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:49:10,720 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:49:10,720 WARN L233 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:49:10,720 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2023-08-26 18:49:10,735 INFO L144 ThreadInstanceAdder]: Constructed 5 joinOtherThreadTransitions. [2023-08-26 18:49:10,736 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 218 places, 251 transitions, 562 flow [2023-08-26 18:49:10,804 INFO L124 PetriNetUnfolderBase]: 164/1038 cut-off events. [2023-08-26 18:49:10,804 INFO L125 PetriNetUnfolderBase]: For 110/110 co-relation queries the response was YES. [2023-08-26 18:49:10,809 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1149 conditions, 1038 events. 164/1038 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 26. Compared 5041 event pairs, 23 based on Foata normal form. 0/808 useless extension candidates. Maximal degree in co-relation 705. Up to 80 conditions per place. [2023-08-26 18:49:10,809 INFO L82 GeneralOperation]: Start removeDead. Operand has 218 places, 251 transitions, 562 flow [2023-08-26 18:49:10,812 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 218 places, 251 transitions, 562 flow [2023-08-26 18:49:10,812 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:49:10,812 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 218 places, 251 transitions, 562 flow [2023-08-26 18:49:10,813 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 218 places, 251 transitions, 562 flow [2023-08-26 18:49:10,813 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 218 places, 251 transitions, 562 flow [2023-08-26 18:49:10,990 INFO L124 PetriNetUnfolderBase]: 164/1038 cut-off events. [2023-08-26 18:49:10,990 INFO L125 PetriNetUnfolderBase]: For 110/110 co-relation queries the response was YES. [2023-08-26 18:49:10,993 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1149 conditions, 1038 events. 164/1038 cut-off events. For 110/110 co-relation queries the response was YES. Maximal size of possible extension queue 26. Compared 5041 event pairs, 23 based on Foata normal form. 0/808 useless extension candidates. Maximal degree in co-relation 705. Up to 80 conditions per place. [2023-08-26 18:49:11,006 INFO L119 LiptonReduction]: Number of co-enabled transitions 34720 [2023-08-26 18:49:13,644 INFO L134 LiptonReduction]: Checked pairs total: 95490 [2023-08-26 18:49:13,644 INFO L136 LiptonReduction]: Total number of compositions: 178 [2023-08-26 18:49:13,645 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:49:13,645 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;@7a2f1a0a, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:49:13,645 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:49:13,646 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:49:13,646 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 18:49:13,646 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:49:13,646 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:49:13,646 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:49:13,646 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2ASSERT_VIOLATIONASSERT, ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-08-26 18:49:13,646 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:49:13,646 INFO L85 PathProgramCache]: Analyzing trace with hash 84718, now seen corresponding path program 1 times [2023-08-26 18:49:13,646 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:49:13,646 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1016714073] [2023-08-26 18:49:13,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:49:13,646 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:49:13,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:49:13,676 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 18:49:13,676 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:49:13,676 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1016714073] [2023-08-26 18:49:13,676 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1016714073] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:49:13,676 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:49:13,676 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:49:13,677 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32797325] [2023-08-26 18:49:13,677 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:49:13,677 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:49:13,677 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:49:13,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:49:13,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:49:13,678 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 184 out of 429 [2023-08-26 18:49:13,678 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 93 places, 122 transitions, 304 flow. Second operand has 3 states, 3 states have (on average 184.66666666666666) internal successors, (554), 3 states have internal predecessors, (554), 0 states have call successors, (0), 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 18:49:13,678 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:49:13,678 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 184 of 429 [2023-08-26 18:49:13,678 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand