/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/pthread-ext/46_monabsex2_vs.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-ac9dbd0-m [2023-08-26 18:02:47,541 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-08-26 18:02:47,628 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 18:02:47,636 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-08-26 18:02:47,637 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.Checked method. Library mode if empty. [2023-08-26 18:02:47,668 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-08-26 18:02:47,669 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-08-26 18:02:47,669 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-08-26 18:02:47,670 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-08-26 18:02:47,673 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-08-26 18:02:47,673 INFO L153 SettingsManager]: * Use SBE=true [2023-08-26 18:02:47,674 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-08-26 18:02:47,674 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-08-26 18:02:47,675 INFO L153 SettingsManager]: * sizeof long=4 [2023-08-26 18:02:47,675 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-08-26 18:02:47,675 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-08-26 18:02:47,676 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-08-26 18:02:47,676 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-08-26 18:02:47,676 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-08-26 18:02:47,676 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-08-26 18:02:47,677 INFO L153 SettingsManager]: * sizeof long double=12 [2023-08-26 18:02:47,677 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-08-26 18:02:47,678 INFO L153 SettingsManager]: * Use constant arrays=true [2023-08-26 18:02:47,678 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-08-26 18:02:47,678 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-08-26 18:02:47,679 INFO L153 SettingsManager]: * To the following directory=./dump/ [2023-08-26 18:02:47,679 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-08-26 18:02:47,679 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:02:47,679 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-08-26 18:02:47,680 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-08-26 18:02:47,680 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-08-26 18:02:47,681 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-08-26 18:02:47,681 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-08-26 18:02:47,681 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-08-26 18:02:47,681 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-08-26 18:02:47,681 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Order of the error locations to be checked -> PROGRAM_FIRST Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check unreachability of reach_error function -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer base address is valid at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Pointer to allocated memory at dereference -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check array bounds for arrays that are off heap -> ASSERTandASSUME Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Check if freed pointer was valid -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Adapt memory model on pointer casts if necessary -> true [2023-08-26 18:02:48,015 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-08-26 18:02:48,038 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-08-26 18:02:48,040 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-08-26 18:02:48,041 INFO L270 PluginConnector]: Initializing CDTParser... [2023-08-26 18:02:48,042 INFO L274 PluginConnector]: CDTParser initialized [2023-08-26 18:02:48,043 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/pthread-ext/46_monabsex2_vs.i [2023-08-26 18:02:49,351 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-08-26 18:02:49,682 INFO L384 CDTParser]: Found 1 translation units. [2023-08-26 18:02:49,682 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/pthread-ext/46_monabsex2_vs.i [2023-08-26 18:02:49,699 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a6f6df82a/f42b7daef9e141bbb735017e547351d0/FLAG718db563e [2023-08-26 18:02:49,715 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a6f6df82a/f42b7daef9e141bbb735017e547351d0 [2023-08-26 18:02:49,720 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-08-26 18:02:49,721 INFO L133 ToolchainWalker]: Walking toolchain with 5 elements. [2023-08-26 18:02:49,724 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-08-26 18:02:49,725 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-08-26 18:02:49,728 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-08-26 18:02:49,729 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:02:49" (1/1) ... [2023-08-26 18:02:49,730 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@aa0024 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:02:49, skipping insertion in model container [2023-08-26 18:02:49,730 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.08 06:02:49" (1/1) ... [2023-08-26 18:02:49,784 INFO L176 MainTranslator]: Built tables and reachable declarations [2023-08-26 18:02:49,972 WARN L635 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2023-08-26 18:02:50,119 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:02:50,131 INFO L201 MainTranslator]: Completed pre-run [2023-08-26 18:02:50,144 WARN L635 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2023-08-26 18:02:50,149 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [265] [2023-08-26 18:02:50,152 WARN L75 lationResultReporter]: Unsoundness Warning: unspecified type, defaulting to int C: short [265] [2023-08-26 18:02:50,164 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-08-26 18:02:50,196 WARN L669 CHandler]: The function __VERIFIER_atomic_begin is called, but not defined or handled by StandardFunctionHandler. [2023-08-26 18:02:50,196 WARN L669 CHandler]: The function __VERIFIER_atomic_end is called, but not defined or handled by StandardFunctionHandler. [2023-08-26 18:02:50,196 WARN L669 CHandler]: The function __builtin_bswap16 is called, but not defined or handled by StandardFunctionHandler. [2023-08-26 18:02:50,203 INFO L206 MainTranslator]: Completed translation [2023-08-26 18:02:50,203 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:02:50 WrapperNode [2023-08-26 18:02:50,204 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-08-26 18:02:50,205 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-08-26 18:02:50,205 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-08-26 18:02:50,205 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-08-26 18:02:50,211 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:02:50" (1/1) ... [2023-08-26 18:02:50,241 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:02:50" (1/1) ... [2023-08-26 18:02:50,257 INFO L138 Inliner]: procedures = 170, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 42 [2023-08-26 18:02:50,257 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-08-26 18:02:50,258 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-08-26 18:02:50,258 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-08-26 18:02:50,258 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-08-26 18:02:50,265 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:02:50" (1/1) ... [2023-08-26 18:02:50,265 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:02:50" (1/1) ... [2023-08-26 18:02:50,268 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:02:50" (1/1) ... [2023-08-26 18:02:50,268 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:02:50" (1/1) ... [2023-08-26 18:02:50,272 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:02:50" (1/1) ... [2023-08-26 18:02:50,275 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:02:50" (1/1) ... [2023-08-26 18:02:50,277 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:02:50" (1/1) ... [2023-08-26 18:02:50,278 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:02:50" (1/1) ... [2023-08-26 18:02:50,279 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-08-26 18:02:50,280 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-08-26 18:02:50,280 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-08-26 18:02:50,280 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-08-26 18:02:50,281 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:02:50" (1/1) ... [2023-08-26 18:02:50,286 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-08-26 18:02:50,298 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-08-26 18:02:50,314 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 18:02:50,325 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 18:02:50,347 INFO L130 BoogieDeclarations]: Found specification of procedure thr1 [2023-08-26 18:02:50,347 INFO L138 BoogieDeclarations]: Found implementation of procedure thr1 [2023-08-26 18:02:50,347 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-08-26 18:02:50,347 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2023-08-26 18:02:50,347 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-08-26 18:02:50,348 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-08-26 18:02:50,348 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-08-26 18:02:50,348 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-08-26 18:02:50,348 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2023-08-26 18:02:50,348 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-08-26 18:02:50,348 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-08-26 18:02:50,349 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 18:02:50,448 INFO L236 CfgBuilder]: Building ICFG [2023-08-26 18:02:50,450 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-08-26 18:02:50,542 INFO L277 CfgBuilder]: Performing block encoding [2023-08-26 18:02:50,567 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-08-26 18:02:50,568 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-08-26 18:02:50,570 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:02:50 BoogieIcfgContainer [2023-08-26 18:02:50,570 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-08-26 18:02:50,572 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-08-26 18:02:50,572 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-08-26 18:02:50,574 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-08-26 18:02:50,575 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.08 06:02:49" (1/3) ... [2023-08-26 18:02:50,575 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29a44613 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:02:50, skipping insertion in model container [2023-08-26 18:02:50,575 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.08 06:02:50" (2/3) ... [2023-08-26 18:02:50,576 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29a44613 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.08 06:02:50, skipping insertion in model container [2023-08-26 18:02:50,576 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.08 06:02:50" (3/3) ... [2023-08-26 18:02:50,577 INFO L112 eAbstractionObserver]: Analyzing ICFG 46_monabsex2_vs.i [2023-08-26 18:02:50,592 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-08-26 18:02:50,592 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 3 error locations. [2023-08-26 18:02:50,592 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2023-08-26 18:02:50,623 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 18:02:50,651 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 37 places, 35 transitions, 75 flow [2023-08-26 18:02:50,678 INFO L124 PetriNetUnfolderBase]: 2/47 cut-off events. [2023-08-26 18:02:50,679 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:02:50,682 INFO L83 FinitePrefix]: Finished finitePrefix Result has 52 conditions, 47 events. 2/47 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 61 event pairs, 0 based on Foata normal form. 0/38 useless extension candidates. Maximal degree in co-relation 24. Up to 4 conditions per place. [2023-08-26 18:02:50,682 INFO L82 GeneralOperation]: Start removeDead. Operand has 37 places, 35 transitions, 75 flow [2023-08-26 18:02:50,685 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 37 places, 35 transitions, 75 flow [2023-08-26 18:02:50,688 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:02:50,704 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 37 places, 35 transitions, 75 flow [2023-08-26 18:02:50,711 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 37 places, 35 transitions, 75 flow [2023-08-26 18:02:50,712 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 37 places, 35 transitions, 75 flow [2023-08-26 18:02:50,739 INFO L124 PetriNetUnfolderBase]: 2/47 cut-off events. [2023-08-26 18:02:50,739 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:02:50,740 INFO L83 FinitePrefix]: Finished finitePrefix Result has 52 conditions, 47 events. 2/47 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 61 event pairs, 0 based on Foata normal form. 0/38 useless extension candidates. Maximal degree in co-relation 24. Up to 4 conditions per place. [2023-08-26 18:02:50,742 INFO L119 LiptonReduction]: Number of co-enabled transitions 210 [2023-08-26 18:02:51,870 INFO L134 LiptonReduction]: Checked pairs total: 181 [2023-08-26 18:02:51,871 INFO L136 LiptonReduction]: Total number of compositions: 31 [2023-08-26 18:02:51,882 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:02:51,888 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;@28ccc219, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:02:51,888 INFO L358 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2023-08-26 18:02:51,890 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:02:51,890 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:02:51,890 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:02:51,890 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:02:51,890 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:02:51,891 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE] === [2023-08-26 18:02:51,895 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:02:51,895 INFO L85 PathProgramCache]: Analyzing trace with hash 5563, now seen corresponding path program 1 times [2023-08-26 18:02:51,907 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:02:51,907 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1604734390] [2023-08-26 18:02:51,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:02:51,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:02:51,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:02:52,078 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 18:02:52,078 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:02:52,078 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1604734390] [2023-08-26 18:02:52,079 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1604734390] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:02:52,079 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:02:52,079 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:02:52,080 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573071732] [2023-08-26 18:02:52,081 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:02:52,088 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:02:52,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:02:52,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:02:52,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:02:52,111 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 66 [2023-08-26 18:02:52,112 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 13 places, 10 transitions, 25 flow. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:52,112 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:02:52,113 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 66 [2023-08-26 18:02:52,113 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:02:52,133 INFO L124 PetriNetUnfolderBase]: 6/22 cut-off events. [2023-08-26 18:02:52,133 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:02:52,133 INFO L83 FinitePrefix]: Finished finitePrefix Result has 49 conditions, 22 events. 6/22 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 47 event pairs, 6 based on Foata normal form. 0/14 useless extension candidates. Maximal degree in co-relation 34. Up to 21 conditions per place. [2023-08-26 18:02:52,134 INFO L140 encePairwiseOnDemand]: 63/66 looper letters, 6 selfloop transitions, 1 changer transitions 0/8 dead transitions. [2023-08-26 18:02:52,135 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 13 places, 8 transitions, 35 flow [2023-08-26 18:02:52,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:02:52,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:02:52,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 69 transitions. [2023-08-26 18:02:52,145 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.3484848484848485 [2023-08-26 18:02:52,146 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 69 transitions. [2023-08-26 18:02:52,146 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 69 transitions. [2023-08-26 18:02:52,147 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:02:52,149 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 69 transitions. [2023-08-26 18:02:52,150 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:52,154 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 66.0) internal successors, (264), 4 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:52,154 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 66.0) internal successors, (264), 4 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:52,156 INFO L175 Difference]: Start difference. First operand has 13 places, 10 transitions, 25 flow. Second operand 3 states and 69 transitions. [2023-08-26 18:02:52,157 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 13 places, 8 transitions, 35 flow [2023-08-26 18:02:52,158 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 13 places, 8 transitions, 35 flow, removed 0 selfloop flow, removed 0 redundant places. [2023-08-26 18:02:52,159 INFO L231 Difference]: Finished difference. Result has 13 places, 8 transitions, 23 flow [2023-08-26 18:02:52,161 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=66, PETRI_DIFFERENCE_MINUEND_FLOW=21, PETRI_DIFFERENCE_MINUEND_PLACES=11, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=8, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=7, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=23, PETRI_PLACES=13, PETRI_TRANSITIONS=8} [2023-08-26 18:02:52,164 INFO L281 CegarLoopForPetriNet]: 13 programPoint places, 0 predicate places. [2023-08-26 18:02:52,164 INFO L495 AbstractCegarLoop]: Abstraction has has 13 places, 8 transitions, 23 flow [2023-08-26 18:02:52,164 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:52,164 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:02:52,164 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:02:52,165 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-08-26 18:02:52,165 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE] === [2023-08-26 18:02:52,165 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:02:52,166 INFO L85 PathProgramCache]: Analyzing trace with hash 5564, now seen corresponding path program 1 times [2023-08-26 18:02:52,166 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:02:52,166 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190577900] [2023-08-26 18:02:52,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:02:52,166 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:02:52,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:02:52,260 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 18:02:52,261 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:02:52,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1190577900] [2023-08-26 18:02:52,261 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1190577900] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:02:52,261 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:02:52,261 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:02:52,262 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047467172] [2023-08-26 18:02:52,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:02:52,263 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:02:52,263 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:02:52,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:02:52,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:02:52,265 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 21 out of 66 [2023-08-26 18:02:52,267 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 13 places, 8 transitions, 23 flow. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:52,267 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:02:52,267 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 21 of 66 [2023-08-26 18:02:52,268 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:02:52,283 INFO L124 PetriNetUnfolderBase]: 4/16 cut-off events. [2023-08-26 18:02:52,283 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:02:52,284 INFO L83 FinitePrefix]: Finished finitePrefix Result has 39 conditions, 16 events. 4/16 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 25 event pairs, 4 based on Foata normal form. 0/13 useless extension candidates. Maximal degree in co-relation 32. Up to 15 conditions per place. [2023-08-26 18:02:52,284 INFO L140 encePairwiseOnDemand]: 64/66 looper letters, 4 selfloop transitions, 1 changer transitions 1/7 dead transitions. [2023-08-26 18:02:52,285 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 14 places, 7 transitions, 33 flow [2023-08-26 18:02:52,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:02:52,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:02:52,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 70 transitions. [2023-08-26 18:02:52,289 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.35353535353535354 [2023-08-26 18:02:52,290 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 70 transitions. [2023-08-26 18:02:52,290 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 70 transitions. [2023-08-26 18:02:52,290 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:02:52,290 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 70 transitions. [2023-08-26 18:02:52,292 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 23.333333333333332) internal successors, (70), 3 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:52,293 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 66.0) internal successors, (264), 4 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:52,294 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 66.0) internal successors, (264), 4 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:52,294 INFO L175 Difference]: Start difference. First operand has 13 places, 8 transitions, 23 flow. Second operand 3 states and 70 transitions. [2023-08-26 18:02:52,294 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 14 places, 7 transitions, 33 flow [2023-08-26 18:02:52,295 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 13 places, 7 transitions, 32 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:02:52,295 INFO L231 Difference]: Finished difference. Result has 13 places, 6 transitions, 20 flow [2023-08-26 18:02:52,298 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=66, PETRI_DIFFERENCE_MINUEND_FLOW=20, PETRI_DIFFERENCE_MINUEND_PLACES=11, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=7, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=6, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=20, PETRI_PLACES=13, PETRI_TRANSITIONS=6} [2023-08-26 18:02:52,299 INFO L281 CegarLoopForPetriNet]: 13 programPoint places, 0 predicate places. [2023-08-26 18:02:52,299 INFO L495 AbstractCegarLoop]: Abstraction has has 13 places, 6 transitions, 20 flow [2023-08-26 18:02:52,299 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:52,299 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:02:52,300 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 18:02:52,301 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-08-26 18:02:52,301 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE] === [2023-08-26 18:02:52,307 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:02:52,308 INFO L85 PathProgramCache]: Analyzing trace with hash 5348704, now seen corresponding path program 1 times [2023-08-26 18:02:52,308 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:02:52,308 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477874122] [2023-08-26 18:02:52,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:02:52,308 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:02:52,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:02:52,408 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 18:02:52,408 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:02:52,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477874122] [2023-08-26 18:02:52,409 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [477874122] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:02:52,409 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:02:52,409 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:02:52,409 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434465417] [2023-08-26 18:02:52,409 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:02:52,410 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:02:52,410 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:02:52,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:02:52,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:02:52,411 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 28 out of 66 [2023-08-26 18:02:52,411 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 13 places, 6 transitions, 20 flow. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:52,411 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:02:52,411 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 28 of 66 [2023-08-26 18:02:52,412 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:02:52,421 INFO L124 PetriNetUnfolderBase]: 0/6 cut-off events. [2023-08-26 18:02:52,422 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:02:52,422 INFO L83 FinitePrefix]: Finished finitePrefix Result has 20 conditions, 6 events. 0/6 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 1. Compared 0 event pairs, 0 based on Foata normal form. 3/9 useless extension candidates. Maximal degree in co-relation 0. Up to 5 conditions per place. [2023-08-26 18:02:52,422 INFO L140 encePairwiseOnDemand]: 64/66 looper letters, 0 selfloop transitions, 0 changer transitions 5/5 dead transitions. [2023-08-26 18:02:52,422 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 13 places, 5 transitions, 26 flow [2023-08-26 18:02:52,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:02:52,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:02:52,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 89 transitions. [2023-08-26 18:02:52,424 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4494949494949495 [2023-08-26 18:02:52,425 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 89 transitions. [2023-08-26 18:02:52,425 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 89 transitions. [2023-08-26 18:02:52,425 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:02:52,425 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 89 transitions. [2023-08-26 18:02:52,426 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:52,427 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 66.0) internal successors, (264), 4 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:52,427 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 66.0) internal successors, (264), 4 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:52,427 INFO L175 Difference]: Start difference. First operand has 13 places, 6 transitions, 20 flow. Second operand 3 states and 89 transitions. [2023-08-26 18:02:52,427 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 13 places, 5 transitions, 26 flow [2023-08-26 18:02:52,428 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 12 places, 5 transitions, 25 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:02:52,428 INFO L231 Difference]: Finished difference. Result has 12 places, 0 transitions, 0 flow [2023-08-26 18:02:52,428 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=66, PETRI_DIFFERENCE_MINUEND_FLOW=17, PETRI_DIFFERENCE_MINUEND_PLACES=10, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=5, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=5, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=12, PETRI_TRANSITIONS=0} [2023-08-26 18:02:52,429 INFO L281 CegarLoopForPetriNet]: 13 programPoint places, -1 predicate places. [2023-08-26 18:02:52,429 INFO L495 AbstractCegarLoop]: Abstraction has has 12 places, 0 transitions, 0 flow [2023-08-26 18:02:52,430 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:52,436 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 4 remaining) [2023-08-26 18:02:52,436 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 4 remaining) [2023-08-26 18:02:52,436 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (1 of 4 remaining) [2023-08-26 18:02:52,437 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 4 remaining) [2023-08-26 18:02:52,437 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-08-26 18:02:52,437 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1] [2023-08-26 18:02:52,439 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:02:52,446 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 37 places, 35 transitions, 75 flow [2023-08-26 18:02:52,457 INFO L124 PetriNetUnfolderBase]: 2/47 cut-off events. [2023-08-26 18:02:52,457 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:02:52,458 INFO L83 FinitePrefix]: Finished finitePrefix Result has 52 conditions, 47 events. 2/47 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 61 event pairs, 0 based on Foata normal form. 0/38 useless extension candidates. Maximal degree in co-relation 24. Up to 4 conditions per place. [2023-08-26 18:02:52,458 INFO L82 GeneralOperation]: Start removeDead. Operand has 37 places, 35 transitions, 75 flow [2023-08-26 18:02:52,458 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 30 places, 27 transitions, 59 flow [2023-08-26 18:02:52,458 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:02:52,459 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 30 places, 27 transitions, 59 flow [2023-08-26 18:02:52,459 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 30 places, 27 transitions, 59 flow [2023-08-26 18:02:52,459 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 30 places, 27 transitions, 59 flow [2023-08-26 18:02:52,467 INFO L124 PetriNetUnfolderBase]: 0/31 cut-off events. [2023-08-26 18:02:52,468 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:02:52,468 INFO L83 FinitePrefix]: Finished finitePrefix Result has 36 conditions, 31 events. 0/31 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 14 event pairs, 0 based on Foata normal form. 0/30 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2023-08-26 18:02:52,468 INFO L119 LiptonReduction]: Number of co-enabled transitions 98 [2023-08-26 18:02:53,634 INFO L134 LiptonReduction]: Checked pairs total: 83 [2023-08-26 18:02:53,634 INFO L136 LiptonReduction]: Total number of compositions: 25 [2023-08-26 18:02:53,636 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:02:53,636 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;@28ccc219, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:02:53,636 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:02:53,638 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:02:53,638 INFO L124 PetriNetUnfolderBase]: 0/5 cut-off events. [2023-08-26 18:02:53,638 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:02:53,638 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:02:53,639 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 18:02:53,639 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:02:53,639 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:02:53,639 INFO L85 PathProgramCache]: Analyzing trace with hash 6072113, now seen corresponding path program 1 times [2023-08-26 18:02:53,639 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:02:53,640 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024480570] [2023-08-26 18:02:53,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:02:53,640 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:02:53,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:02:53,665 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:02:53,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:02:53,686 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:02:53,686 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:02:53,687 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:02:53,687 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-08-26 18:02:53,687 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:02:53,688 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:02:53,688 WARN L233 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:02:53,688 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2023-08-26 18:02:53,698 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 18:02:53,700 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 47 places, 43 transitions, 98 flow [2023-08-26 18:02:53,709 INFO L124 PetriNetUnfolderBase]: 3/69 cut-off events. [2023-08-26 18:02:53,709 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 18:02:53,710 INFO L83 FinitePrefix]: Finished finitePrefix Result has 79 conditions, 69 events. 3/69 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 107 event pairs, 0 based on Foata normal form. 0/55 useless extension candidates. Maximal degree in co-relation 48. Up to 6 conditions per place. [2023-08-26 18:02:53,710 INFO L82 GeneralOperation]: Start removeDead. Operand has 47 places, 43 transitions, 98 flow [2023-08-26 18:02:53,710 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 47 places, 43 transitions, 98 flow [2023-08-26 18:02:53,711 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:02:53,711 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 47 places, 43 transitions, 98 flow [2023-08-26 18:02:53,711 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 47 places, 43 transitions, 98 flow [2023-08-26 18:02:53,711 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 47 places, 43 transitions, 98 flow [2023-08-26 18:02:53,719 INFO L124 PetriNetUnfolderBase]: 3/69 cut-off events. [2023-08-26 18:02:53,719 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 18:02:53,719 INFO L83 FinitePrefix]: Finished finitePrefix Result has 79 conditions, 69 events. 3/69 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 107 event pairs, 0 based on Foata normal form. 0/55 useless extension candidates. Maximal degree in co-relation 48. Up to 6 conditions per place. [2023-08-26 18:02:53,720 INFO L119 LiptonReduction]: Number of co-enabled transitions 532 [2023-08-26 18:02:54,640 INFO L134 LiptonReduction]: Checked pairs total: 1145 [2023-08-26 18:02:54,641 INFO L136 LiptonReduction]: Total number of compositions: 32 [2023-08-26 18:02:54,642 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:02:54,643 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;@28ccc219, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:02:54,643 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-08-26 18:02:54,644 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:02:54,644 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 18:02:54,644 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:02:54,644 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:02:54,645 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:02:54,645 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 1 more)] === [2023-08-26 18:02:54,645 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:02:54,645 INFO L85 PathProgramCache]: Analyzing trace with hash 9020, now seen corresponding path program 1 times [2023-08-26 18:02:54,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:02:54,645 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623961765] [2023-08-26 18:02:54,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:02:54,646 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:02:54,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:02:54,681 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 18:02:54,682 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:02:54,682 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623961765] [2023-08-26 18:02:54,682 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1623961765] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:02:54,682 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:02:54,682 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:02:54,682 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921572258] [2023-08-26 18:02:54,682 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:02:54,683 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:02:54,683 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:02:54,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:02:54,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:02:54,684 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 26 out of 75 [2023-08-26 18:02:54,684 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 23 places, 18 transitions, 48 flow. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,684 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:02:54,684 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 26 of 75 [2023-08-26 18:02:54,684 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:02:54,713 INFO L124 PetriNetUnfolderBase]: 66/158 cut-off events. [2023-08-26 18:02:54,713 INFO L125 PetriNetUnfolderBase]: For 14/14 co-relation queries the response was YES. [2023-08-26 18:02:54,714 INFO L83 FinitePrefix]: Finished finitePrefix Result has 313 conditions, 158 events. 66/158 cut-off events. For 14/14 co-relation queries the response was YES. Maximal size of possible extension queue 25. Compared 734 event pairs, 66 based on Foata normal form. 0/100 useless extension candidates. Maximal degree in co-relation 87. Up to 129 conditions per place. [2023-08-26 18:02:54,715 INFO L140 encePairwiseOnDemand]: 72/75 looper letters, 10 selfloop transitions, 1 changer transitions 0/16 dead transitions. [2023-08-26 18:02:54,715 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 23 places, 16 transitions, 66 flow [2023-08-26 18:02:54,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:02:54,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:02:54,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 91 transitions. [2023-08-26 18:02:54,716 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.40444444444444444 [2023-08-26 18:02:54,716 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 91 transitions. [2023-08-26 18:02:54,716 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 91 transitions. [2023-08-26 18:02:54,716 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:02:54,717 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 91 transitions. [2023-08-26 18:02:54,717 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,718 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 75.0) internal successors, (300), 4 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,718 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 75.0) internal successors, (300), 4 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,718 INFO L175 Difference]: Start difference. First operand has 23 places, 18 transitions, 48 flow. Second operand 3 states and 91 transitions. [2023-08-26 18:02:54,718 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 23 places, 16 transitions, 66 flow [2023-08-26 18:02:54,719 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 23 places, 16 transitions, 64 flow, removed 1 selfloop flow, removed 0 redundant places. [2023-08-26 18:02:54,719 INFO L231 Difference]: Finished difference. Result has 23 places, 16 transitions, 44 flow [2023-08-26 18:02:54,719 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=75, PETRI_DIFFERENCE_MINUEND_FLOW=42, PETRI_DIFFERENCE_MINUEND_PLACES=21, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=16, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=15, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=44, PETRI_PLACES=23, PETRI_TRANSITIONS=16} [2023-08-26 18:02:54,720 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 0 predicate places. [2023-08-26 18:02:54,720 INFO L495 AbstractCegarLoop]: Abstraction has has 23 places, 16 transitions, 44 flow [2023-08-26 18:02:54,720 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,720 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:02:54,720 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:02:54,721 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-08-26 18:02:54,721 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 1 more)] === [2023-08-26 18:02:54,721 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:02:54,721 INFO L85 PathProgramCache]: Analyzing trace with hash 9019, now seen corresponding path program 1 times [2023-08-26 18:02:54,721 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:02:54,721 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [321470752] [2023-08-26 18:02:54,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:02:54,722 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:02:54,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:02:54,742 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 18:02:54,742 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:02:54,742 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [321470752] [2023-08-26 18:02:54,743 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [321470752] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:02:54,743 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:02:54,743 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:02:54,743 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890433444] [2023-08-26 18:02:54,743 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:02:54,743 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:02:54,743 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:02:54,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:02:54,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:02:54,744 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 25 out of 75 [2023-08-26 18:02:54,745 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 23 places, 16 transitions, 44 flow. Second operand has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,745 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:02:54,745 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 25 of 75 [2023-08-26 18:02:54,745 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:02:54,766 INFO L124 PetriNetUnfolderBase]: 39/105 cut-off events. [2023-08-26 18:02:54,767 INFO L125 PetriNetUnfolderBase]: For 10/10 co-relation queries the response was YES. [2023-08-26 18:02:54,767 INFO L83 FinitePrefix]: Finished finitePrefix Result has 210 conditions, 105 events. 39/105 cut-off events. For 10/10 co-relation queries the response was YES. Maximal size of possible extension queue 16. Compared 417 event pairs, 39 based on Foata normal form. 0/77 useless extension candidates. Maximal degree in co-relation 202. Up to 81 conditions per place. [2023-08-26 18:02:54,768 INFO L140 encePairwiseOnDemand]: 73/75 looper letters, 9 selfloop transitions, 1 changer transitions 0/15 dead transitions. [2023-08-26 18:02:54,768 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 24 places, 15 transitions, 62 flow [2023-08-26 18:02:54,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:02:54,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:02:54,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 86 transitions. [2023-08-26 18:02:54,769 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.38222222222222224 [2023-08-26 18:02:54,769 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 86 transitions. [2023-08-26 18:02:54,769 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 86 transitions. [2023-08-26 18:02:54,769 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:02:54,769 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 86 transitions. [2023-08-26 18:02:54,770 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,770 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 75.0) internal successors, (300), 4 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,771 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 75.0) internal successors, (300), 4 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,771 INFO L175 Difference]: Start difference. First operand has 23 places, 16 transitions, 44 flow. Second operand 3 states and 86 transitions. [2023-08-26 18:02:54,771 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 24 places, 15 transitions, 62 flow [2023-08-26 18:02:54,771 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 23 places, 15 transitions, 61 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:02:54,772 INFO L231 Difference]: Finished difference. Result has 23 places, 15 transitions, 43 flow [2023-08-26 18:02:54,772 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=75, PETRI_DIFFERENCE_MINUEND_FLOW=41, PETRI_DIFFERENCE_MINUEND_PLACES=21, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=15, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=14, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=43, PETRI_PLACES=23, PETRI_TRANSITIONS=15} [2023-08-26 18:02:54,772 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 0 predicate places. [2023-08-26 18:02:54,772 INFO L495 AbstractCegarLoop]: Abstraction has has 23 places, 15 transitions, 43 flow [2023-08-26 18:02:54,773 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,773 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:02:54,773 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 18:02:54,773 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-08-26 18:02:54,773 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 1 more)] === [2023-08-26 18:02:54,773 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:02:54,774 INFO L85 PathProgramCache]: Analyzing trace with hash 8676207, now seen corresponding path program 1 times [2023-08-26 18:02:54,774 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:02:54,774 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150114597] [2023-08-26 18:02:54,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:02:54,774 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:02:54,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:02:54,818 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 18:02:54,819 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:02:54,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150114597] [2023-08-26 18:02:54,819 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150114597] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:02:54,819 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:02:54,819 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:02:54,819 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114416487] [2023-08-26 18:02:54,820 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:02:54,820 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:02:54,820 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:02:54,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:02:54,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:02:54,821 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 32 out of 75 [2023-08-26 18:02:54,821 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 23 places, 15 transitions, 43 flow. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,821 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:02:54,821 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 32 of 75 [2023-08-26 18:02:54,821 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:02:54,846 INFO L124 PetriNetUnfolderBase]: 22/66 cut-off events. [2023-08-26 18:02:54,846 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 18:02:54,847 INFO L83 FinitePrefix]: Finished finitePrefix Result has 138 conditions, 66 events. 22/66 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 205 event pairs, 7 based on Foata normal form. 0/59 useless extension candidates. Maximal degree in co-relation 129. Up to 32 conditions per place. [2023-08-26 18:02:54,847 INFO L140 encePairwiseOnDemand]: 70/75 looper letters, 9 selfloop transitions, 3 changer transitions 4/21 dead transitions. [2023-08-26 18:02:54,847 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 25 places, 21 transitions, 92 flow [2023-08-26 18:02:54,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:02:54,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:02:54,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 114 transitions. [2023-08-26 18:02:54,849 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5066666666666667 [2023-08-26 18:02:54,849 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 114 transitions. [2023-08-26 18:02:54,849 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 114 transitions. [2023-08-26 18:02:54,849 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:02:54,849 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 114 transitions. [2023-08-26 18:02:54,850 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,850 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 75.0) internal successors, (300), 4 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,851 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 75.0) internal successors, (300), 4 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,851 INFO L175 Difference]: Start difference. First operand has 23 places, 15 transitions, 43 flow. Second operand 3 states and 114 transitions. [2023-08-26 18:02:54,851 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 25 places, 21 transitions, 92 flow [2023-08-26 18:02:54,851 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 24 places, 21 transitions, 91 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:02:54,852 INFO L231 Difference]: Finished difference. Result has 25 places, 15 transitions, 55 flow [2023-08-26 18:02:54,852 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=75, PETRI_DIFFERENCE_MINUEND_FLOW=42, PETRI_DIFFERENCE_MINUEND_PLACES=22, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=15, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=12, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=55, PETRI_PLACES=25, PETRI_TRANSITIONS=15} [2023-08-26 18:02:54,852 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 2 predicate places. [2023-08-26 18:02:54,853 INFO L495 AbstractCegarLoop]: Abstraction has has 25 places, 15 transitions, 55 flow [2023-08-26 18:02:54,853 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,853 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:02:54,853 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:02:54,853 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-08-26 18:02:54,853 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 1 more)] === [2023-08-26 18:02:54,854 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:02:54,854 INFO L85 PathProgramCache]: Analyzing trace with hash 128657026, now seen corresponding path program 1 times [2023-08-26 18:02:54,854 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:02:54,854 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [173897692] [2023-08-26 18:02:54,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:02:54,854 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:02:54,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:02:54,916 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-08-26 18:02:54,916 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:02:54,916 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [173897692] [2023-08-26 18:02:54,916 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [173897692] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:02:54,917 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:02:54,917 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:02:54,917 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184328424] [2023-08-26 18:02:54,917 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:02:54,917 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:02:54,917 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:02:54,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:02:54,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:02:54,918 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 32 out of 75 [2023-08-26 18:02:54,918 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 25 places, 15 transitions, 55 flow. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,918 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:02:54,918 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 32 of 75 [2023-08-26 18:02:54,918 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:02:54,948 INFO L124 PetriNetUnfolderBase]: 36/84 cut-off events. [2023-08-26 18:02:54,948 INFO L125 PetriNetUnfolderBase]: For 12/12 co-relation queries the response was YES. [2023-08-26 18:02:54,949 INFO L83 FinitePrefix]: Finished finitePrefix Result has 213 conditions, 84 events. 36/84 cut-off events. For 12/12 co-relation queries the response was YES. Maximal size of possible extension queue 13. Compared 294 event pairs, 9 based on Foata normal form. 4/85 useless extension candidates. Maximal degree in co-relation 202. Up to 55 conditions per place. [2023-08-26 18:02:54,949 INFO L140 encePairwiseOnDemand]: 71/75 looper letters, 0 selfloop transitions, 0 changer transitions 19/19 dead transitions. [2023-08-26 18:02:54,949 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 25 places, 19 transitions, 96 flow [2023-08-26 18:02:54,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:02:54,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:02:54,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 114 transitions. [2023-08-26 18:02:54,951 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5066666666666667 [2023-08-26 18:02:54,951 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 114 transitions. [2023-08-26 18:02:54,951 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 114 transitions. [2023-08-26 18:02:54,951 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:02:54,951 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 114 transitions. [2023-08-26 18:02:54,952 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,953 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 75.0) internal successors, (300), 4 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,953 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 75.0) internal successors, (300), 4 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,953 INFO L175 Difference]: Start difference. First operand has 25 places, 15 transitions, 55 flow. Second operand 3 states and 114 transitions. [2023-08-26 18:02:54,953 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 25 places, 19 transitions, 96 flow [2023-08-26 18:02:54,954 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 23 places, 19 transitions, 90 flow, removed 0 selfloop flow, removed 2 redundant places. [2023-08-26 18:02:54,954 INFO L231 Difference]: Finished difference. Result has 23 places, 0 transitions, 0 flow [2023-08-26 18:02:54,954 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=75, PETRI_DIFFERENCE_MINUEND_FLOW=41, PETRI_DIFFERENCE_MINUEND_PLACES=21, 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=3, PETRI_FLOW=0, PETRI_PLACES=23, PETRI_TRANSITIONS=0} [2023-08-26 18:02:54,955 INFO L281 CegarLoopForPetriNet]: 23 programPoint places, 0 predicate places. [2023-08-26 18:02:54,955 INFO L495 AbstractCegarLoop]: Abstraction has has 23 places, 0 transitions, 0 flow [2023-08-26 18:02:54,955 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:54,955 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 5 remaining) [2023-08-26 18:02:54,955 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 5 remaining) [2023-08-26 18:02:54,956 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 5 remaining) [2023-08-26 18:02:54,956 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (1 of 5 remaining) [2023-08-26 18:02:54,956 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 5 remaining) [2023-08-26 18:02:54,956 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-08-26 18:02:54,956 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 18:02:54,957 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:02:54,958 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 47 places, 43 transitions, 98 flow [2023-08-26 18:02:54,963 INFO L124 PetriNetUnfolderBase]: 3/69 cut-off events. [2023-08-26 18:02:54,963 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 18:02:54,964 INFO L83 FinitePrefix]: Finished finitePrefix Result has 79 conditions, 69 events. 3/69 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 107 event pairs, 0 based on Foata normal form. 0/55 useless extension candidates. Maximal degree in co-relation 48. Up to 6 conditions per place. [2023-08-26 18:02:54,964 INFO L82 GeneralOperation]: Start removeDead. Operand has 47 places, 43 transitions, 98 flow [2023-08-26 18:02:54,964 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 40 places, 35 transitions, 82 flow [2023-08-26 18:02:54,964 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:02:54,964 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 40 places, 35 transitions, 82 flow [2023-08-26 18:02:54,965 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 40 places, 35 transitions, 82 flow [2023-08-26 18:02:54,965 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 40 places, 35 transitions, 82 flow [2023-08-26 18:02:54,968 INFO L124 PetriNetUnfolderBase]: 0/45 cut-off events. [2023-08-26 18:02:54,968 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 18:02:54,968 INFO L83 FinitePrefix]: Finished finitePrefix Result has 55 conditions, 45 events. 0/45 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 30 event pairs, 0 based on Foata normal form. 0/43 useless extension candidates. Maximal degree in co-relation 0. Up to 3 conditions per place. [2023-08-26 18:02:54,969 INFO L119 LiptonReduction]: Number of co-enabled transitions 308 [2023-08-26 18:02:55,951 INFO L134 LiptonReduction]: Checked pairs total: 683 [2023-08-26 18:02:55,951 INFO L136 LiptonReduction]: Total number of compositions: 26 [2023-08-26 18:02:55,952 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:02:55,953 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;@28ccc219, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:02:55,953 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:02:55,955 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:02:55,955 INFO L124 PetriNetUnfolderBase]: 0/15 cut-off events. [2023-08-26 18:02:55,955 INFO L125 PetriNetUnfolderBase]: For 2/2 co-relation queries the response was YES. [2023-08-26 18:02:55,955 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:02:55,955 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 2, 1, 1, 1, 1] [2023-08-26 18:02:55,956 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:02:55,956 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:02:55,956 INFO L85 PathProgramCache]: Analyzing trace with hash 171584740, now seen corresponding path program 1 times [2023-08-26 18:02:55,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:02:55,956 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1723906580] [2023-08-26 18:02:55,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:02:55,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:02:55,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:02:55,978 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:02:55,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:02:55,992 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:02:55,992 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:02:55,992 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:02:55,992 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-08-26 18:02:55,993 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:02:55,993 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:02:55,995 WARN L233 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:02:55,995 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2023-08-26 18:02:56,008 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 18:02:56,013 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 57 places, 51 transitions, 123 flow [2023-08-26 18:02:56,020 INFO L124 PetriNetUnfolderBase]: 4/91 cut-off events. [2023-08-26 18:02:56,020 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 18:02:56,021 INFO L83 FinitePrefix]: Finished finitePrefix Result has 107 conditions, 91 events. 4/91 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 150 event pairs, 0 based on Foata normal form. 0/72 useless extension candidates. Maximal degree in co-relation 73. Up to 8 conditions per place. [2023-08-26 18:02:56,021 INFO L82 GeneralOperation]: Start removeDead. Operand has 57 places, 51 transitions, 123 flow [2023-08-26 18:02:56,022 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 57 places, 51 transitions, 123 flow [2023-08-26 18:02:56,022 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:02:56,023 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 57 places, 51 transitions, 123 flow [2023-08-26 18:02:56,023 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 57 places, 51 transitions, 123 flow [2023-08-26 18:02:56,023 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 57 places, 51 transitions, 123 flow [2023-08-26 18:02:56,038 INFO L124 PetriNetUnfolderBase]: 4/91 cut-off events. [2023-08-26 18:02:56,038 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 18:02:56,040 INFO L83 FinitePrefix]: Finished finitePrefix Result has 107 conditions, 91 events. 4/91 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 150 event pairs, 0 based on Foata normal form. 0/72 useless extension candidates. Maximal degree in co-relation 73. Up to 8 conditions per place. [2023-08-26 18:02:56,041 INFO L119 LiptonReduction]: Number of co-enabled transitions 966 [2023-08-26 18:02:56,949 INFO L134 LiptonReduction]: Checked pairs total: 2046 [2023-08-26 18:02:56,949 INFO L136 LiptonReduction]: Total number of compositions: 36 [2023-08-26 18:02:56,951 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:02:56,951 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;@28ccc219, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:02:56,951 INFO L358 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2023-08-26 18:02:56,952 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:02:56,952 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 18:02:56,952 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:02:56,952 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:02:56,953 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:02:56,953 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 2 more)] === [2023-08-26 18:02:56,953 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:02:56,953 INFO L85 PathProgramCache]: Analyzing trace with hash 12891, now seen corresponding path program 1 times [2023-08-26 18:02:56,953 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:02:56,953 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2110871957] [2023-08-26 18:02:56,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:02:56,953 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:02:56,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:02:56,979 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 18:02:56,980 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:02:56,980 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2110871957] [2023-08-26 18:02:56,980 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2110871957] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:02:56,980 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:02:56,980 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:02:56,980 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88610744] [2023-08-26 18:02:56,980 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:02:56,981 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:02:56,981 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:02:56,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:02:56,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:02:56,982 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 31 out of 87 [2023-08-26 18:02:56,982 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 30 places, 23 transitions, 67 flow. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:56,982 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:02:56,982 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 31 of 87 [2023-08-26 18:02:56,982 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:02:57,078 INFO L124 PetriNetUnfolderBase]: 450/826 cut-off events. [2023-08-26 18:02:57,079 INFO L125 PetriNetUnfolderBase]: For 142/142 co-relation queries the response was YES. [2023-08-26 18:02:57,080 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1662 conditions, 826 events. 450/826 cut-off events. For 142/142 co-relation queries the response was YES. Maximal size of possible extension queue 89. Compared 4802 event pairs, 450 based on Foata normal form. 0/528 useless extension candidates. Maximal degree in co-relation 318. Up to 705 conditions per place. [2023-08-26 18:02:57,083 INFO L140 encePairwiseOnDemand]: 84/87 looper letters, 14 selfloop transitions, 1 changer transitions 0/21 dead transitions. [2023-08-26 18:02:57,084 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 30 places, 21 transitions, 93 flow [2023-08-26 18:02:57,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:02:57,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:02:57,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 110 transitions. [2023-08-26 18:02:57,085 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.421455938697318 [2023-08-26 18:02:57,085 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 110 transitions. [2023-08-26 18:02:57,085 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 110 transitions. [2023-08-26 18:02:57,085 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:02:57,085 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 110 transitions. [2023-08-26 18:02:57,086 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,087 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 87.0) internal successors, (348), 4 states have internal predecessors, (348), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,087 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 87.0) internal successors, (348), 4 states have internal predecessors, (348), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,087 INFO L175 Difference]: Start difference. First operand has 30 places, 23 transitions, 67 flow. Second operand 3 states and 110 transitions. [2023-08-26 18:02:57,087 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 30 places, 21 transitions, 93 flow [2023-08-26 18:02:57,088 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 30 places, 21 transitions, 87 flow, removed 3 selfloop flow, removed 0 redundant places. [2023-08-26 18:02:57,089 INFO L231 Difference]: Finished difference. Result has 30 places, 21 transitions, 59 flow [2023-08-26 18:02:57,089 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=87, PETRI_DIFFERENCE_MINUEND_FLOW=57, PETRI_DIFFERENCE_MINUEND_PLACES=28, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=21, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=20, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=59, PETRI_PLACES=30, PETRI_TRANSITIONS=21} [2023-08-26 18:02:57,089 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, 0 predicate places. [2023-08-26 18:02:57,089 INFO L495 AbstractCegarLoop]: Abstraction has has 30 places, 21 transitions, 59 flow [2023-08-26 18:02:57,090 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 3 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,090 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:02:57,090 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:02:57,090 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-08-26 18:02:57,090 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 2 more)] === [2023-08-26 18:02:57,090 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:02:57,090 INFO L85 PathProgramCache]: Analyzing trace with hash 12890, now seen corresponding path program 1 times [2023-08-26 18:02:57,091 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:02:57,091 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104873120] [2023-08-26 18:02:57,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:02:57,091 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:02:57,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:02:57,114 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 18:02:57,115 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:02:57,115 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104873120] [2023-08-26 18:02:57,115 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1104873120] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:02:57,115 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:02:57,115 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:02:57,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355403338] [2023-08-26 18:02:57,115 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:02:57,116 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:02:57,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:02:57,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:02:57,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:02:57,117 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 30 out of 87 [2023-08-26 18:02:57,117 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 30 places, 21 transitions, 59 flow. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,117 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:02:57,117 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 30 of 87 [2023-08-26 18:02:57,117 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:02:57,175 INFO L124 PetriNetUnfolderBase]: 279/549 cut-off events. [2023-08-26 18:02:57,175 INFO L125 PetriNetUnfolderBase]: For 50/50 co-relation queries the response was YES. [2023-08-26 18:02:57,176 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1083 conditions, 549 events. 279/549 cut-off events. For 50/50 co-relation queries the response was YES. Maximal size of possible extension queue 60. Compared 2985 event pairs, 279 based on Foata normal form. 0/393 useless extension candidates. Maximal degree in co-relation 1074. Up to 449 conditions per place. [2023-08-26 18:02:57,179 INFO L140 encePairwiseOnDemand]: 85/87 looper letters, 13 selfloop transitions, 1 changer transitions 0/20 dead transitions. [2023-08-26 18:02:57,179 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 20 transitions, 85 flow [2023-08-26 18:02:57,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:02:57,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:02:57,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 105 transitions. [2023-08-26 18:02:57,180 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.40229885057471265 [2023-08-26 18:02:57,180 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 105 transitions. [2023-08-26 18:02:57,180 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 105 transitions. [2023-08-26 18:02:57,180 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:02:57,180 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 105 transitions. [2023-08-26 18:02:57,181 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 35.0) internal successors, (105), 3 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,181 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 87.0) internal successors, (348), 4 states have internal predecessors, (348), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,182 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 87.0) internal successors, (348), 4 states have internal predecessors, (348), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,182 INFO L175 Difference]: Start difference. First operand has 30 places, 21 transitions, 59 flow. Second operand 3 states and 105 transitions. [2023-08-26 18:02:57,182 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 20 transitions, 85 flow [2023-08-26 18:02:57,182 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 30 places, 20 transitions, 84 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:02:57,183 INFO L231 Difference]: Finished difference. Result has 30 places, 20 transitions, 58 flow [2023-08-26 18:02:57,183 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=87, PETRI_DIFFERENCE_MINUEND_FLOW=56, PETRI_DIFFERENCE_MINUEND_PLACES=28, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=19, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=58, PETRI_PLACES=30, PETRI_TRANSITIONS=20} [2023-08-26 18:02:57,183 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, 0 predicate places. [2023-08-26 18:02:57,184 INFO L495 AbstractCegarLoop]: Abstraction has has 30 places, 20 transitions, 58 flow [2023-08-26 18:02:57,184 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,184 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:02:57,184 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 18:02:57,184 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-08-26 18:02:57,184 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 2 more)] === [2023-08-26 18:02:57,185 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:02:57,185 INFO L85 PathProgramCache]: Analyzing trace with hash 12397071, now seen corresponding path program 1 times [2023-08-26 18:02:57,185 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:02:57,185 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [259423506] [2023-08-26 18:02:57,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:02:57,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:02:57,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:02:57,211 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 18:02:57,211 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:02:57,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [259423506] [2023-08-26 18:02:57,211 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [259423506] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:02:57,211 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:02:57,211 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:02:57,211 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220333426] [2023-08-26 18:02:57,211 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:02:57,212 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:02:57,212 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:02:57,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:02:57,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:02:57,213 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 36 out of 87 [2023-08-26 18:02:57,213 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 30 places, 20 transitions, 58 flow. Second operand has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 3 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,213 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:02:57,213 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 36 of 87 [2023-08-26 18:02:57,213 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:02:57,261 INFO L124 PetriNetUnfolderBase]: 162/314 cut-off events. [2023-08-26 18:02:57,261 INFO L125 PetriNetUnfolderBase]: For 36/36 co-relation queries the response was YES. [2023-08-26 18:02:57,262 INFO L83 FinitePrefix]: Finished finitePrefix Result has 652 conditions, 314 events. 162/314 cut-off events. For 36/36 co-relation queries the response was YES. Maximal size of possible extension queue 40. Compared 1403 event pairs, 41 based on Foata normal form. 0/261 useless extension candidates. Maximal degree in co-relation 642. Up to 226 conditions per place. [2023-08-26 18:02:57,263 INFO L140 encePairwiseOnDemand]: 80/87 looper letters, 19 selfloop transitions, 4 changer transitions 0/29 dead transitions. [2023-08-26 18:02:57,263 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 32 places, 29 transitions, 132 flow [2023-08-26 18:02:57,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:02:57,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:02:57,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 134 transitions. [2023-08-26 18:02:57,264 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5134099616858238 [2023-08-26 18:02:57,264 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 134 transitions. [2023-08-26 18:02:57,264 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 134 transitions. [2023-08-26 18:02:57,264 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:02:57,265 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 134 transitions. [2023-08-26 18:02:57,265 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 44.666666666666664) internal successors, (134), 3 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,266 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 87.0) internal successors, (348), 4 states have internal predecessors, (348), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,266 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 87.0) internal successors, (348), 4 states have internal predecessors, (348), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,266 INFO L175 Difference]: Start difference. First operand has 30 places, 20 transitions, 58 flow. Second operand 3 states and 134 transitions. [2023-08-26 18:02:57,266 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 32 places, 29 transitions, 132 flow [2023-08-26 18:02:57,266 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 31 places, 29 transitions, 131 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:02:57,267 INFO L231 Difference]: Finished difference. Result has 32 places, 23 transitions, 87 flow [2023-08-26 18:02:57,267 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=87, PETRI_DIFFERENCE_MINUEND_FLOW=57, PETRI_DIFFERENCE_MINUEND_PLACES=29, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=16, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=87, PETRI_PLACES=32, PETRI_TRANSITIONS=23} [2023-08-26 18:02:57,268 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, 2 predicate places. [2023-08-26 18:02:57,268 INFO L495 AbstractCegarLoop]: Abstraction has has 32 places, 23 transitions, 87 flow [2023-08-26 18:02:57,268 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 3 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,268 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:02:57,268 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:02:57,268 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-08-26 18:02:57,268 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 2 more)] === [2023-08-26 18:02:57,269 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:02:57,269 INFO L85 PathProgramCache]: Analyzing trace with hash -877066777, now seen corresponding path program 1 times [2023-08-26 18:02:57,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:02:57,269 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1838118228] [2023-08-26 18:02:57,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:02:57,269 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:02:57,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:02:57,301 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 18:02:57,302 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:02:57,302 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1838118228] [2023-08-26 18:02:57,302 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1838118228] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:02:57,302 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:02:57,302 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:02:57,302 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485427750] [2023-08-26 18:02:57,302 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:02:57,303 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:02:57,303 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:02:57,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:02:57,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:02:57,303 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 36 out of 87 [2023-08-26 18:02:57,304 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 32 places, 23 transitions, 87 flow. Second operand has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 3 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,304 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:02:57,304 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 36 of 87 [2023-08-26 18:02:57,304 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:02:57,367 INFO L124 PetriNetUnfolderBase]: 279/467 cut-off events. [2023-08-26 18:02:57,367 INFO L125 PetriNetUnfolderBase]: For 82/82 co-relation queries the response was YES. [2023-08-26 18:02:57,369 INFO L83 FinitePrefix]: Finished finitePrefix Result has 1174 conditions, 467 events. 279/467 cut-off events. For 82/82 co-relation queries the response was YES. Maximal size of possible extension queue 45. Compared 2038 event pairs, 57 based on Foata normal form. 46/505 useless extension candidates. Maximal degree in co-relation 1162. Up to 392 conditions per place. [2023-08-26 18:02:57,370 INFO L140 encePairwiseOnDemand]: 81/87 looper letters, 0 selfloop transitions, 0 changer transitions 29/29 dead transitions. [2023-08-26 18:02:57,370 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 29 transitions, 155 flow [2023-08-26 18:02:57,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:02:57,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:02:57,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 134 transitions. [2023-08-26 18:02:57,371 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5134099616858238 [2023-08-26 18:02:57,371 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 134 transitions. [2023-08-26 18:02:57,371 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 134 transitions. [2023-08-26 18:02:57,371 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:02:57,371 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 134 transitions. [2023-08-26 18:02:57,372 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 44.666666666666664) internal successors, (134), 3 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,372 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 87.0) internal successors, (348), 4 states have internal predecessors, (348), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,373 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 87.0) internal successors, (348), 4 states have internal predecessors, (348), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,373 INFO L175 Difference]: Start difference. First operand has 32 places, 23 transitions, 87 flow. Second operand 3 states and 134 transitions. [2023-08-26 18:02:57,373 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 29 transitions, 155 flow [2023-08-26 18:02:57,374 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 30 places, 29 transitions, 151 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:02:57,374 INFO L231 Difference]: Finished difference. Result has 30 places, 0 transitions, 0 flow [2023-08-26 18:02:57,374 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=87, PETRI_DIFFERENCE_MINUEND_FLOW=71, PETRI_DIFFERENCE_MINUEND_PLACES=28, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=20, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=30, PETRI_TRANSITIONS=0} [2023-08-26 18:02:57,374 INFO L281 CegarLoopForPetriNet]: 30 programPoint places, 0 predicate places. [2023-08-26 18:02:57,375 INFO L495 AbstractCegarLoop]: Abstraction has has 30 places, 0 transitions, 0 flow [2023-08-26 18:02:57,375 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 3 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:57,375 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 6 remaining) [2023-08-26 18:02:57,375 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 6 remaining) [2023-08-26 18:02:57,375 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 6 remaining) [2023-08-26 18:02:57,375 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 6 remaining) [2023-08-26 18:02:57,375 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (1 of 6 remaining) [2023-08-26 18:02:57,375 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 6 remaining) [2023-08-26 18:02:57,376 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-08-26 18:02:57,376 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 18:02:57,376 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:02:57,377 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 57 places, 51 transitions, 123 flow [2023-08-26 18:02:57,383 INFO L124 PetriNetUnfolderBase]: 4/91 cut-off events. [2023-08-26 18:02:57,384 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 18:02:57,384 INFO L83 FinitePrefix]: Finished finitePrefix Result has 107 conditions, 91 events. 4/91 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 150 event pairs, 0 based on Foata normal form. 0/72 useless extension candidates. Maximal degree in co-relation 73. Up to 8 conditions per place. [2023-08-26 18:02:57,384 INFO L82 GeneralOperation]: Start removeDead. Operand has 57 places, 51 transitions, 123 flow [2023-08-26 18:02:57,385 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 50 places, 43 transitions, 107 flow [2023-08-26 18:02:57,385 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:02:57,385 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 50 places, 43 transitions, 107 flow [2023-08-26 18:02:57,385 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 50 places, 43 transitions, 107 flow [2023-08-26 18:02:57,385 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 50 places, 43 transitions, 107 flow [2023-08-26 18:02:57,389 INFO L124 PetriNetUnfolderBase]: 0/59 cut-off events. [2023-08-26 18:02:57,389 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 18:02:57,390 INFO L83 FinitePrefix]: Finished finitePrefix Result has 75 conditions, 59 events. 0/59 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 43 event pairs, 0 based on Foata normal form. 0/56 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2023-08-26 18:02:57,390 INFO L119 LiptonReduction]: Number of co-enabled transitions 630 [2023-08-26 18:02:58,482 INFO L134 LiptonReduction]: Checked pairs total: 1540 [2023-08-26 18:02:58,482 INFO L136 LiptonReduction]: Total number of compositions: 30 [2023-08-26 18:02:58,484 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:02:58,485 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;@28ccc219, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:02:58,485 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:02:58,487 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:02:58,487 INFO L124 PetriNetUnfolderBase]: 0/21 cut-off events. [2023-08-26 18:02:58,487 INFO L125 PetriNetUnfolderBase]: For 7/7 co-relation queries the response was YES. [2023-08-26 18:02:58,487 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:02:58,488 INFO L208 CegarLoopForPetriNet]: trace histogram [3, 3, 1, 1, 1, 1, 1] [2023-08-26 18:02:58,488 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:02:58,488 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:02:58,488 INFO L85 PathProgramCache]: Analyzing trace with hash 543560663, now seen corresponding path program 1 times [2023-08-26 18:02:58,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:02:58,488 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583061220] [2023-08-26 18:02:58,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:02:58,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:02:58,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:02:58,508 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:02:58,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:02:58,516 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:02:58,516 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:02:58,516 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:02:58,516 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-08-26 18:02:58,516 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:02:58,517 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:02:58,517 WARN L233 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:02:58,517 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2023-08-26 18:02:58,532 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 18:02:58,534 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 67 places, 59 transitions, 150 flow [2023-08-26 18:02:58,541 INFO L124 PetriNetUnfolderBase]: 5/113 cut-off events. [2023-08-26 18:02:58,542 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 18:02:58,542 INFO L83 FinitePrefix]: Finished finitePrefix Result has 136 conditions, 113 events. 5/113 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 204 event pairs, 0 based on Foata normal form. 0/89 useless extension candidates. Maximal degree in co-relation 99. Up to 10 conditions per place. [2023-08-26 18:02:58,542 INFO L82 GeneralOperation]: Start removeDead. Operand has 67 places, 59 transitions, 150 flow [2023-08-26 18:02:58,543 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 67 places, 59 transitions, 150 flow [2023-08-26 18:02:58,543 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:02:58,543 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 67 places, 59 transitions, 150 flow [2023-08-26 18:02:58,543 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 67 places, 59 transitions, 150 flow [2023-08-26 18:02:58,543 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 67 places, 59 transitions, 150 flow [2023-08-26 18:02:58,556 INFO L124 PetriNetUnfolderBase]: 5/113 cut-off events. [2023-08-26 18:02:58,556 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 18:02:58,557 INFO L83 FinitePrefix]: Finished finitePrefix Result has 136 conditions, 113 events. 5/113 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 204 event pairs, 0 based on Foata normal form. 0/89 useless extension candidates. Maximal degree in co-relation 99. Up to 10 conditions per place. [2023-08-26 18:02:58,558 INFO L119 LiptonReduction]: Number of co-enabled transitions 1512 [2023-08-26 18:02:59,641 INFO L134 LiptonReduction]: Checked pairs total: 3111 [2023-08-26 18:02:59,641 INFO L136 LiptonReduction]: Total number of compositions: 40 [2023-08-26 18:02:59,642 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:02:59,643 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;@28ccc219, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:02:59,643 INFO L358 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2023-08-26 18:02:59,644 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:02:59,644 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:02:59,644 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:02:59,644 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:02:59,644 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:02:59,644 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 3 more)] === [2023-08-26 18:02:59,644 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:02:59,644 INFO L85 PathProgramCache]: Analyzing trace with hash 17271, now seen corresponding path program 1 times [2023-08-26 18:02:59,644 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:02:59,645 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217616423] [2023-08-26 18:02:59,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:02:59,645 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:02:59,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:02:59,668 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 18:02:59,668 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:02:59,668 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217616423] [2023-08-26 18:02:59,668 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [217616423] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:02:59,668 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:02:59,668 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:02:59,669 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063077135] [2023-08-26 18:02:59,669 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:02:59,669 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:02:59,669 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:02:59,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:02:59,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:02:59,670 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 35 out of 99 [2023-08-26 18:02:59,670 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 37 places, 28 transitions, 88 flow. Second operand has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:02:59,670 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:02:59,670 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 35 of 99 [2023-08-26 18:02:59,670 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:02:59,974 INFO L124 PetriNetUnfolderBase]: 2562/4074 cut-off events. [2023-08-26 18:02:59,974 INFO L125 PetriNetUnfolderBase]: For 1054/1054 co-relation queries the response was YES. [2023-08-26 18:02:59,983 INFO L83 FinitePrefix]: Finished finitePrefix Result has 8319 conditions, 4074 events. 2562/4074 cut-off events. For 1054/1054 co-relation queries the response was YES. Maximal size of possible extension queue 328. Compared 26071 event pairs, 2562 based on Foata normal form. 0/2624 useless extension candidates. Maximal degree in co-relation 1694. Up to 3585 conditions per place. [2023-08-26 18:03:00,009 INFO L140 encePairwiseOnDemand]: 96/99 looper letters, 18 selfloop transitions, 1 changer transitions 0/26 dead transitions. [2023-08-26 18:03:00,010 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 26 transitions, 122 flow [2023-08-26 18:03:00,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:03:00,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:03:00,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 126 transitions. [2023-08-26 18:03:00,011 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.42424242424242425 [2023-08-26 18:03:00,011 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 126 transitions. [2023-08-26 18:03:00,011 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 126 transitions. [2023-08-26 18:03:00,011 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:03:00,011 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 126 transitions. [2023-08-26 18:03:00,011 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 42.0) internal successors, (126), 3 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,012 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 99.0) internal successors, (396), 4 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,012 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 99.0) internal successors, (396), 4 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,012 INFO L175 Difference]: Start difference. First operand has 37 places, 28 transitions, 88 flow. Second operand 3 states and 126 transitions. [2023-08-26 18:03:00,012 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 26 transitions, 122 flow [2023-08-26 18:03:00,015 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 26 transitions, 110 flow, removed 6 selfloop flow, removed 0 redundant places. [2023-08-26 18:03:00,015 INFO L231 Difference]: Finished difference. Result has 37 places, 26 transitions, 74 flow [2023-08-26 18:03:00,015 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=99, PETRI_DIFFERENCE_MINUEND_FLOW=72, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=26, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=25, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=74, PETRI_PLACES=37, PETRI_TRANSITIONS=26} [2023-08-26 18:03:00,016 INFO L281 CegarLoopForPetriNet]: 37 programPoint places, 0 predicate places. [2023-08-26 18:03:00,016 INFO L495 AbstractCegarLoop]: Abstraction has has 37 places, 26 transitions, 74 flow [2023-08-26 18:03:00,016 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,016 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:03:00,016 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:03:00,016 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-08-26 18:03:00,016 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 3 more)] === [2023-08-26 18:03:00,017 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:03:00,017 INFO L85 PathProgramCache]: Analyzing trace with hash 17272, now seen corresponding path program 1 times [2023-08-26 18:03:00,017 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:03:00,017 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413182403] [2023-08-26 18:03:00,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:03:00,017 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:03:00,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:03:00,038 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 18:03:00,039 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:03:00,039 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1413182403] [2023-08-26 18:03:00,039 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1413182403] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:03:00,039 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:03:00,039 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:03:00,039 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091946786] [2023-08-26 18:03:00,039 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:03:00,040 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:03:00,040 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:03:00,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:03:00,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:03:00,040 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 36 out of 99 [2023-08-26 18:03:00,041 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 37 places, 26 transitions, 74 flow. Second operand has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,041 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:03:00,041 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 36 of 99 [2023-08-26 18:03:00,041 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:03:00,310 INFO L124 PetriNetUnfolderBase]: 1623/2709 cut-off events. [2023-08-26 18:03:00,310 INFO L125 PetriNetUnfolderBase]: For 210/210 co-relation queries the response was YES. [2023-08-26 18:03:00,317 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5340 conditions, 2709 events. 1623/2709 cut-off events. For 210/210 co-relation queries the response was YES. Maximal size of possible extension queue 223. Compared 16878 event pairs, 1623 based on Foata normal form. 0/1913 useless extension candidates. Maximal degree in co-relation 5330. Up to 2305 conditions per place. [2023-08-26 18:03:00,334 INFO L140 encePairwiseOnDemand]: 97/99 looper letters, 17 selfloop transitions, 1 changer transitions 0/25 dead transitions. [2023-08-26 18:03:00,334 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 38 places, 25 transitions, 108 flow [2023-08-26 18:03:00,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:03:00,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:03:00,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 127 transitions. [2023-08-26 18:03:00,336 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.4276094276094276 [2023-08-26 18:03:00,336 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 127 transitions. [2023-08-26 18:03:00,336 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 127 transitions. [2023-08-26 18:03:00,336 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:03:00,336 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 127 transitions. [2023-08-26 18:03:00,337 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 42.333333333333336) internal successors, (127), 3 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,337 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 99.0) internal successors, (396), 4 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,337 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 99.0) internal successors, (396), 4 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,337 INFO L175 Difference]: Start difference. First operand has 37 places, 26 transitions, 74 flow. Second operand 3 states and 127 transitions. [2023-08-26 18:03:00,337 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 38 places, 25 transitions, 108 flow [2023-08-26 18:03:00,338 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 25 transitions, 107 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:03:00,338 INFO L231 Difference]: Finished difference. Result has 37 places, 25 transitions, 73 flow [2023-08-26 18:03:00,339 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=99, PETRI_DIFFERENCE_MINUEND_FLOW=71, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=25, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=24, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=73, PETRI_PLACES=37, PETRI_TRANSITIONS=25} [2023-08-26 18:03:00,340 INFO L281 CegarLoopForPetriNet]: 37 programPoint places, 0 predicate places. [2023-08-26 18:03:00,340 INFO L495 AbstractCegarLoop]: Abstraction has has 37 places, 25 transitions, 73 flow [2023-08-26 18:03:00,341 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,341 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:03:00,341 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 18:03:00,341 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-08-26 18:03:00,341 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 3 more)] === [2023-08-26 18:03:00,342 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:03:00,342 INFO L85 PathProgramCache]: Analyzing trace with hash 16611436, now seen corresponding path program 1 times [2023-08-26 18:03:00,342 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:03:00,342 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1906688568] [2023-08-26 18:03:00,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:03:00,342 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:03:00,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:03:00,368 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 18:03:00,369 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:03:00,369 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1906688568] [2023-08-26 18:03:00,369 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1906688568] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:03:00,369 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:03:00,369 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:03:00,370 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843306716] [2023-08-26 18:03:00,370 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:03:00,370 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:03:00,370 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:03:00,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:03:00,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:03:00,371 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 40 out of 99 [2023-08-26 18:03:00,371 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 37 places, 25 transitions, 73 flow. Second operand has 3 states, 3 states have (on average 41.333333333333336) internal successors, (124), 3 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,371 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:03:00,371 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 40 of 99 [2023-08-26 18:03:00,371 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:03:00,524 INFO L124 PetriNetUnfolderBase]: 1032/1602 cut-off events. [2023-08-26 18:03:00,525 INFO L125 PetriNetUnfolderBase]: For 163/163 co-relation queries the response was YES. [2023-08-26 18:03:00,528 INFO L83 FinitePrefix]: Finished finitePrefix Result has 3332 conditions, 1602 events. 1032/1602 cut-off events. For 163/163 co-relation queries the response was YES. Maximal size of possible extension queue 164. Compared 8274 event pairs, 269 based on Foata normal form. 0/1245 useless extension candidates. Maximal degree in co-relation 3321. Up to 1390 conditions per place. [2023-08-26 18:03:00,535 INFO L140 encePairwiseOnDemand]: 90/99 looper letters, 25 selfloop transitions, 5 changer transitions 0/37 dead transitions. [2023-08-26 18:03:00,536 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 39 places, 37 transitions, 172 flow [2023-08-26 18:03:00,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:03:00,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:03:00,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 154 transitions. [2023-08-26 18:03:00,537 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5185185185185185 [2023-08-26 18:03:00,537 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 154 transitions. [2023-08-26 18:03:00,537 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 154 transitions. [2023-08-26 18:03:00,537 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:03:00,537 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 154 transitions. [2023-08-26 18:03:00,538 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 51.333333333333336) internal successors, (154), 3 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,538 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 99.0) internal successors, (396), 4 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,539 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 99.0) internal successors, (396), 4 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,539 INFO L175 Difference]: Start difference. First operand has 37 places, 25 transitions, 73 flow. Second operand 3 states and 154 transitions. [2023-08-26 18:03:00,540 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 39 places, 37 transitions, 172 flow [2023-08-26 18:03:00,541 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 38 places, 37 transitions, 171 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:03:00,542 INFO L231 Difference]: Finished difference. Result has 39 places, 29 transitions, 111 flow [2023-08-26 18:03:00,542 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=99, PETRI_DIFFERENCE_MINUEND_FLOW=72, PETRI_DIFFERENCE_MINUEND_PLACES=36, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=25, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=20, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=111, PETRI_PLACES=39, PETRI_TRANSITIONS=29} [2023-08-26 18:03:00,543 INFO L281 CegarLoopForPetriNet]: 37 programPoint places, 2 predicate places. [2023-08-26 18:03:00,543 INFO L495 AbstractCegarLoop]: Abstraction has has 39 places, 29 transitions, 111 flow [2023-08-26 18:03:00,543 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 41.333333333333336) internal successors, (124), 3 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,543 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:03:00,543 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:03:00,544 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-08-26 18:03:00,544 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 3 more)] === [2023-08-26 18:03:00,544 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:03:00,544 INFO L85 PathProgramCache]: Analyzing trace with hash 1163951293, now seen corresponding path program 1 times [2023-08-26 18:03:00,544 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:03:00,544 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111372223] [2023-08-26 18:03:00,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:03:00,544 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:03:00,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:03:00,596 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 18:03:00,596 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:03:00,597 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111372223] [2023-08-26 18:03:00,597 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2111372223] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:03:00,597 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:03:00,597 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:03:00,597 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526252643] [2023-08-26 18:03:00,597 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:03:00,597 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:03:00,597 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:03:00,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:03:00,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:03:00,598 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 40 out of 99 [2023-08-26 18:03:00,598 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 39 places, 29 transitions, 111 flow. Second operand has 3 states, 3 states have (on average 42.666666666666664) internal successors, (128), 3 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,598 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:03:00,598 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 40 of 99 [2023-08-26 18:03:00,599 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:03:00,819 INFO L124 PetriNetUnfolderBase]: 1623/2343 cut-off events. [2023-08-26 18:03:00,819 INFO L125 PetriNetUnfolderBase]: For 474/474 co-relation queries the response was YES. [2023-08-26 18:03:00,823 INFO L83 FinitePrefix]: Finished finitePrefix Result has 5831 conditions, 2343 events. 1623/2343 cut-off events. For 474/474 co-relation queries the response was YES. Maximal size of possible extension queue 160. Compared 11404 event pairs, 347 based on Foata normal form. 342/2664 useless extension candidates. Maximal degree in co-relation 5818. Up to 2160 conditions per place. [2023-08-26 18:03:00,830 INFO L140 encePairwiseOnDemand]: 91/99 looper letters, 0 selfloop transitions, 0 changer transitions 37/37 dead transitions. [2023-08-26 18:03:00,830 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 37 transitions, 202 flow [2023-08-26 18:03:00,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:03:00,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:03:00,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 154 transitions. [2023-08-26 18:03:00,831 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5185185185185185 [2023-08-26 18:03:00,831 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 154 transitions. [2023-08-26 18:03:00,831 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 154 transitions. [2023-08-26 18:03:00,831 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:03:00,831 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 154 transitions. [2023-08-26 18:03:00,832 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 51.333333333333336) internal successors, (154), 3 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,833 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 99.0) internal successors, (396), 4 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,833 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 99.0) internal successors, (396), 4 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,833 INFO L175 Difference]: Start difference. First operand has 39 places, 29 transitions, 111 flow. Second operand 3 states and 154 transitions. [2023-08-26 18:03:00,833 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 37 transitions, 202 flow [2023-08-26 18:03:00,834 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 36 places, 37 transitions, 197 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:03:00,835 INFO L231 Difference]: Finished difference. Result has 36 places, 0 transitions, 0 flow [2023-08-26 18:03:00,835 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=99, PETRI_DIFFERENCE_MINUEND_FLOW=90, PETRI_DIFFERENCE_MINUEND_PLACES=34, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=25, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=25, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=36, PETRI_TRANSITIONS=0} [2023-08-26 18:03:00,835 INFO L281 CegarLoopForPetriNet]: 37 programPoint places, -1 predicate places. [2023-08-26 18:03:00,835 INFO L495 AbstractCegarLoop]: Abstraction has has 36 places, 0 transitions, 0 flow [2023-08-26 18:03:00,835 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 42.666666666666664) internal successors, (128), 3 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:00,835 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 7 remaining) [2023-08-26 18:03:00,836 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (5 of 7 remaining) [2023-08-26 18:03:00,836 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 7 remaining) [2023-08-26 18:03:00,836 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 7 remaining) [2023-08-26 18:03:00,836 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 7 remaining) [2023-08-26 18:03:00,836 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 7 remaining) [2023-08-26 18:03:00,836 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (0 of 7 remaining) [2023-08-26 18:03:00,836 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-08-26 18:03:00,836 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 18:03:00,838 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:03:00,839 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 67 places, 59 transitions, 150 flow [2023-08-26 18:03:00,846 INFO L124 PetriNetUnfolderBase]: 5/113 cut-off events. [2023-08-26 18:03:00,846 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 18:03:00,846 INFO L83 FinitePrefix]: Finished finitePrefix Result has 136 conditions, 113 events. 5/113 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 204 event pairs, 0 based on Foata normal form. 0/89 useless extension candidates. Maximal degree in co-relation 99. Up to 10 conditions per place. [2023-08-26 18:03:00,846 INFO L82 GeneralOperation]: Start removeDead. Operand has 67 places, 59 transitions, 150 flow [2023-08-26 18:03:00,847 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 60 places, 51 transitions, 134 flow [2023-08-26 18:03:00,847 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:03:00,847 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 60 places, 51 transitions, 134 flow [2023-08-26 18:03:00,847 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 60 places, 51 transitions, 134 flow [2023-08-26 18:03:00,847 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 60 places, 51 transitions, 134 flow [2023-08-26 18:03:00,852 INFO L124 PetriNetUnfolderBase]: 0/73 cut-off events. [2023-08-26 18:03:00,852 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 18:03:00,852 INFO L83 FinitePrefix]: Finished finitePrefix Result has 96 conditions, 73 events. 0/73 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 58 event pairs, 0 based on Foata normal form. 0/69 useless extension candidates. Maximal degree in co-relation 0. Up to 5 conditions per place. [2023-08-26 18:03:00,853 INFO L119 LiptonReduction]: Number of co-enabled transitions 1064 [2023-08-26 18:03:02,028 INFO L134 LiptonReduction]: Checked pairs total: 2941 [2023-08-26 18:03:02,029 INFO L136 LiptonReduction]: Total number of compositions: 34 [2023-08-26 18:03:02,030 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:03:02,030 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;@28ccc219, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:03:02,030 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:03:02,033 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:03:02,033 INFO L124 PetriNetUnfolderBase]: 0/29 cut-off events. [2023-08-26 18:03:02,033 INFO L125 PetriNetUnfolderBase]: For 16/16 co-relation queries the response was YES. [2023-08-26 18:03:02,033 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:03:02,034 INFO L208 CegarLoopForPetriNet]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1] [2023-08-26 18:03:02,034 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:03:02,034 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:03:02,034 INFO L85 PathProgramCache]: Analyzing trace with hash 544756977, now seen corresponding path program 1 times [2023-08-26 18:03:02,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:03:02,034 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1946863644] [2023-08-26 18:03:02,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:03:02,035 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:03:02,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:03:02,047 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:03:02,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:03:02,055 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:03:02,055 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:03:02,055 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:03:02,055 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2023-08-26 18:03:02,056 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:03:02,056 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:03:02,056 WARN L233 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:03:02,056 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2023-08-26 18:03:02,070 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 18:03:02,071 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 77 places, 67 transitions, 179 flow [2023-08-26 18:03:02,079 INFO L124 PetriNetUnfolderBase]: 6/135 cut-off events. [2023-08-26 18:03:02,079 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-26 18:03:02,080 INFO L83 FinitePrefix]: Finished finitePrefix Result has 166 conditions, 135 events. 6/135 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 233 event pairs, 0 based on Foata normal form. 0/106 useless extension candidates. Maximal degree in co-relation 126. Up to 12 conditions per place. [2023-08-26 18:03:02,080 INFO L82 GeneralOperation]: Start removeDead. Operand has 77 places, 67 transitions, 179 flow [2023-08-26 18:03:02,080 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 77 places, 67 transitions, 179 flow [2023-08-26 18:03:02,080 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:03:02,081 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 77 places, 67 transitions, 179 flow [2023-08-26 18:03:02,081 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 77 places, 67 transitions, 179 flow [2023-08-26 18:03:02,081 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 77 places, 67 transitions, 179 flow [2023-08-26 18:03:02,088 INFO L124 PetriNetUnfolderBase]: 6/135 cut-off events. [2023-08-26 18:03:02,088 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-26 18:03:02,089 INFO L83 FinitePrefix]: Finished finitePrefix Result has 166 conditions, 135 events. 6/135 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 233 event pairs, 0 based on Foata normal form. 0/106 useless extension candidates. Maximal degree in co-relation 126. Up to 12 conditions per place. [2023-08-26 18:03:02,090 INFO L119 LiptonReduction]: Number of co-enabled transitions 2170 [2023-08-26 18:03:03,220 INFO L134 LiptonReduction]: Checked pairs total: 5026 [2023-08-26 18:03:03,220 INFO L136 LiptonReduction]: Total number of compositions: 44 [2023-08-26 18:03:03,221 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:03:03,221 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;@28ccc219, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:03:03,221 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2023-08-26 18:03:03,222 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:03:03,222 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 18:03:03,222 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:03:03,222 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:03:03,222 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:03:03,223 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 4 more)] === [2023-08-26 18:03:03,223 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:03:03,223 INFO L85 PathProgramCache]: Analyzing trace with hash 22170, now seen corresponding path program 1 times [2023-08-26 18:03:03,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:03:03,223 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320999259] [2023-08-26 18:03:03,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:03:03,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:03:03,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:03:03,238 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-08-26 18:03:03,239 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:03:03,239 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320999259] [2023-08-26 18:03:03,239 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1320999259] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:03:03,239 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:03:03,239 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:03:03,239 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751866427] [2023-08-26 18:03:03,239 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:03:03,239 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:03:03,240 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:03:03,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:03:03,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:03:03,240 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 40 out of 111 [2023-08-26 18:03:03,240 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 44 places, 33 transitions, 111 flow. Second operand has 3 states, 3 states have (on average 40.666666666666664) internal successors, (122), 3 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:03,241 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:03:03,241 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 40 of 111 [2023-08-26 18:03:03,241 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:03:04,876 INFO L124 PetriNetUnfolderBase]: 13314/19370 cut-off events. [2023-08-26 18:03:04,877 INFO L125 PetriNetUnfolderBase]: For 6750/6750 co-relation queries the response was YES. [2023-08-26 18:03:04,925 INFO L83 FinitePrefix]: Finished finitePrefix Result has 40000 conditions, 19370 events. 13314/19370 cut-off events. For 6750/6750 co-relation queries the response was YES. Maximal size of possible extension queue 1246. Compared 132777 event pairs, 13314 based on Foata normal form. 0/12544 useless extension candidates. Maximal degree in co-relation 8462. Up to 17409 conditions per place. [2023-08-26 18:03:05,023 INFO L140 encePairwiseOnDemand]: 108/111 looper letters, 22 selfloop transitions, 1 changer transitions 0/31 dead transitions. [2023-08-26 18:03:05,024 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 44 places, 31 transitions, 153 flow [2023-08-26 18:03:05,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:03:05,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:03:05,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 145 transitions. [2023-08-26 18:03:05,026 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43543543543543545 [2023-08-26 18:03:05,026 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 145 transitions. [2023-08-26 18:03:05,026 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 145 transitions. [2023-08-26 18:03:05,026 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:03:05,026 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 145 transitions. [2023-08-26 18:03:05,026 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 48.333333333333336) internal successors, (145), 3 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:05,027 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 111.0) internal successors, (444), 4 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:05,027 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 111.0) internal successors, (444), 4 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:05,027 INFO L175 Difference]: Start difference. First operand has 44 places, 33 transitions, 111 flow. Second operand 3 states and 145 transitions. [2023-08-26 18:03:05,027 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 44 places, 31 transitions, 153 flow [2023-08-26 18:03:05,032 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 44 places, 31 transitions, 133 flow, removed 10 selfloop flow, removed 0 redundant places. [2023-08-26 18:03:05,033 INFO L231 Difference]: Finished difference. Result has 44 places, 31 transitions, 89 flow [2023-08-26 18:03:05,033 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=111, PETRI_DIFFERENCE_MINUEND_FLOW=87, PETRI_DIFFERENCE_MINUEND_PLACES=42, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=31, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=30, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=89, PETRI_PLACES=44, PETRI_TRANSITIONS=31} [2023-08-26 18:03:05,034 INFO L281 CegarLoopForPetriNet]: 44 programPoint places, 0 predicate places. [2023-08-26 18:03:05,034 INFO L495 AbstractCegarLoop]: Abstraction has has 44 places, 31 transitions, 89 flow [2023-08-26 18:03:05,034 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 40.666666666666664) internal successors, (122), 3 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:05,034 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:03:05,034 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:03:05,034 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2023-08-26 18:03:05,034 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 4 more)] === [2023-08-26 18:03:05,034 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:03:05,035 INFO L85 PathProgramCache]: Analyzing trace with hash 22172, now seen corresponding path program 1 times [2023-08-26 18:03:05,035 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:03:05,035 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [800910868] [2023-08-26 18:03:05,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:03:05,035 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:03:05,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:03:05,061 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 18:03:05,061 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:03:05,061 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [800910868] [2023-08-26 18:03:05,061 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [800910868] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:03:05,061 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:03:05,061 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:03:05,062 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608775336] [2023-08-26 18:03:05,062 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:03:05,062 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:03:05,062 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:03:05,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:03:05,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:03:05,063 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 41 out of 111 [2023-08-26 18:03:05,063 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 44 places, 31 transitions, 89 flow. Second operand has 3 states, 3 states have (on average 41.666666666666664) internal successors, (125), 3 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:05,063 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:03:05,063 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 41 of 111 [2023-08-26 18:03:05,063 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:03:06,094 INFO L124 PetriNetUnfolderBase]: 8535/12885 cut-off events. [2023-08-26 18:03:06,094 INFO L125 PetriNetUnfolderBase]: For 850/850 co-relation queries the response was YES. [2023-08-26 18:03:06,137 INFO L83 FinitePrefix]: Finished finitePrefix Result has 25437 conditions, 12885 events. 8535/12885 cut-off events. For 850/850 co-relation queries the response was YES. Maximal size of possible extension queue 852. Compared 87827 event pairs, 8535 based on Foata normal form. 0/9017 useless extension candidates. Maximal degree in co-relation 25426. Up to 11265 conditions per place. [2023-08-26 18:03:06,203 INFO L140 encePairwiseOnDemand]: 109/111 looper letters, 21 selfloop transitions, 1 changer transitions 0/30 dead transitions. [2023-08-26 18:03:06,203 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 30 transitions, 131 flow [2023-08-26 18:03:06,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:03:06,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:03:06,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 146 transitions. [2023-08-26 18:03:06,204 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43843843843843844 [2023-08-26 18:03:06,204 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 146 transitions. [2023-08-26 18:03:06,204 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 146 transitions. [2023-08-26 18:03:06,204 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:03:06,204 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 146 transitions. [2023-08-26 18:03:06,205 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 48.666666666666664) internal successors, (146), 3 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:06,206 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 111.0) internal successors, (444), 4 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:06,207 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 111.0) internal successors, (444), 4 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:06,207 INFO L175 Difference]: Start difference. First operand has 44 places, 31 transitions, 89 flow. Second operand 3 states and 146 transitions. [2023-08-26 18:03:06,207 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 30 transitions, 131 flow [2023-08-26 18:03:06,208 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 44 places, 30 transitions, 130 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:03:06,209 INFO L231 Difference]: Finished difference. Result has 44 places, 30 transitions, 88 flow [2023-08-26 18:03:06,209 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=111, PETRI_DIFFERENCE_MINUEND_FLOW=86, PETRI_DIFFERENCE_MINUEND_PLACES=42, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=30, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=88, PETRI_PLACES=44, PETRI_TRANSITIONS=30} [2023-08-26 18:03:06,210 INFO L281 CegarLoopForPetriNet]: 44 programPoint places, 0 predicate places. [2023-08-26 18:03:06,210 INFO L495 AbstractCegarLoop]: Abstraction has has 44 places, 30 transitions, 88 flow [2023-08-26 18:03:06,210 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 41.666666666666664) internal successors, (125), 3 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:06,210 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:03:06,210 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 18:03:06,211 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2023-08-26 18:03:06,211 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 4 more)] === [2023-08-26 18:03:06,211 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:03:06,211 INFO L85 PathProgramCache]: Analyzing trace with hash 21326028, now seen corresponding path program 1 times [2023-08-26 18:03:06,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:03:06,211 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1107613008] [2023-08-26 18:03:06,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:03:06,212 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:03:06,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:03:06,264 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 18:03:06,264 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:03:06,264 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1107613008] [2023-08-26 18:03:06,264 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1107613008] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:03:06,264 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:03:06,264 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:03:06,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483078627] [2023-08-26 18:03:06,265 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:03:06,265 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:03:06,265 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:03:06,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:03:06,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:03:06,266 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 44 out of 111 [2023-08-26 18:03:06,267 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 44 places, 30 transitions, 88 flow. Second operand has 3 states, 3 states have (on average 45.333333333333336) internal successors, (136), 3 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:06,267 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:03:06,267 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 44 of 111 [2023-08-26 18:03:06,267 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:03:06,996 INFO L124 PetriNetUnfolderBase]: 5980/8248 cut-off events. [2023-08-26 18:03:06,996 INFO L125 PetriNetUnfolderBase]: For 720/720 co-relation queries the response was YES. [2023-08-26 18:03:07,012 INFO L83 FinitePrefix]: Finished finitePrefix Result has 17134 conditions, 8248 events. 5980/8248 cut-off events. For 720/720 co-relation queries the response was YES. Maximal size of possible extension queue 659. Compared 45313 event pairs, 1759 based on Foata normal form. 0/6125 useless extension candidates. Maximal degree in co-relation 17122. Up to 7756 conditions per place. [2023-08-26 18:03:07,045 INFO L140 encePairwiseOnDemand]: 100/111 looper letters, 31 selfloop transitions, 6 changer transitions 0/45 dead transitions. [2023-08-26 18:03:07,045 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 46 places, 45 transitions, 212 flow [2023-08-26 18:03:07,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:03:07,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:03:07,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 174 transitions. [2023-08-26 18:03:07,046 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5225225225225225 [2023-08-26 18:03:07,046 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 174 transitions. [2023-08-26 18:03:07,047 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 174 transitions. [2023-08-26 18:03:07,047 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:03:07,047 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 174 transitions. [2023-08-26 18:03:07,047 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 58.0) internal successors, (174), 3 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:07,048 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 111.0) internal successors, (444), 4 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:07,048 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 111.0) internal successors, (444), 4 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:07,048 INFO L175 Difference]: Start difference. First operand has 44 places, 30 transitions, 88 flow. Second operand 3 states and 174 transitions. [2023-08-26 18:03:07,048 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 46 places, 45 transitions, 212 flow [2023-08-26 18:03:07,049 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 45 places, 45 transitions, 211 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:03:07,050 INFO L231 Difference]: Finished difference. Result has 46 places, 35 transitions, 135 flow [2023-08-26 18:03:07,050 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=111, PETRI_DIFFERENCE_MINUEND_FLOW=87, PETRI_DIFFERENCE_MINUEND_PLACES=43, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=30, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=24, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=135, PETRI_PLACES=46, PETRI_TRANSITIONS=35} [2023-08-26 18:03:07,051 INFO L281 CegarLoopForPetriNet]: 44 programPoint places, 2 predicate places. [2023-08-26 18:03:07,051 INFO L495 AbstractCegarLoop]: Abstraction has has 46 places, 35 transitions, 135 flow [2023-08-26 18:03:07,051 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 45.333333333333336) internal successors, (136), 3 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:07,051 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:03:07,051 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:03:07,051 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2023-08-26 18:03:07,051 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 4 more)] === [2023-08-26 18:03:07,051 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:03:07,051 INFO L85 PathProgramCache]: Analyzing trace with hash 780782841, now seen corresponding path program 1 times [2023-08-26 18:03:07,052 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:03:07,052 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940423817] [2023-08-26 18:03:07,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:03:07,052 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:03:07,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:03:07,076 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 18:03:07,076 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:03:07,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940423817] [2023-08-26 18:03:07,076 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1940423817] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:03:07,076 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:03:07,076 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:03:07,076 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520813515] [2023-08-26 18:03:07,076 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:03:07,077 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:03:07,077 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:03:07,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:03:07,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:03:07,077 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 44 out of 111 [2023-08-26 18:03:07,078 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 46 places, 35 transitions, 135 flow. Second operand has 3 states, 3 states have (on average 46.666666666666664) internal successors, (140), 3 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:07,078 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:03:07,078 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 44 of 111 [2023-08-26 18:03:07,078 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:03:07,851 INFO L124 PetriNetUnfolderBase]: 8535/11343 cut-off events. [2023-08-26 18:03:07,851 INFO L125 PetriNetUnfolderBase]: For 2560/2560 co-relation queries the response was YES. [2023-08-26 18:03:07,881 INFO L83 FinitePrefix]: Finished finitePrefix Result has 27938 conditions, 11343 events. 8535/11343 cut-off events. For 2560/2560 co-relation queries the response was YES. Maximal size of possible extension queue 595. Compared 57970 event pairs, 2043 based on Foata normal form. 2092/13381 useless extension candidates. Maximal degree in co-relation 27924. Up to 10912 conditions per place. [2023-08-26 18:03:07,890 INFO L140 encePairwiseOnDemand]: 101/111 looper letters, 0 selfloop transitions, 0 changer transitions 45/45 dead transitions. [2023-08-26 18:03:07,890 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 43 places, 45 transitions, 249 flow [2023-08-26 18:03:07,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:03:07,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:03:07,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 174 transitions. [2023-08-26 18:03:07,891 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5225225225225225 [2023-08-26 18:03:07,891 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 174 transitions. [2023-08-26 18:03:07,891 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 174 transitions. [2023-08-26 18:03:07,892 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:03:07,892 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 174 transitions. [2023-08-26 18:03:07,892 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 58.0) internal successors, (174), 3 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:07,893 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 111.0) internal successors, (444), 4 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:07,893 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 111.0) internal successors, (444), 4 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:07,893 INFO L175 Difference]: Start difference. First operand has 46 places, 35 transitions, 135 flow. Second operand 3 states and 174 transitions. [2023-08-26 18:03:07,893 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 43 places, 45 transitions, 249 flow [2023-08-26 18:03:07,896 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 42 places, 45 transitions, 243 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:03:07,896 INFO L231 Difference]: Finished difference. Result has 42 places, 0 transitions, 0 flow [2023-08-26 18:03:07,896 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=111, PETRI_DIFFERENCE_MINUEND_FLOW=109, PETRI_DIFFERENCE_MINUEND_PLACES=40, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=30, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=30, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=42, PETRI_TRANSITIONS=0} [2023-08-26 18:03:07,896 INFO L281 CegarLoopForPetriNet]: 44 programPoint places, -2 predicate places. [2023-08-26 18:03:07,897 INFO L495 AbstractCegarLoop]: Abstraction has has 42 places, 0 transitions, 0 flow [2023-08-26 18:03:07,897 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 46.666666666666664) internal successors, (140), 3 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:07,897 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (7 of 8 remaining) [2023-08-26 18:03:07,897 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 8 remaining) [2023-08-26 18:03:07,897 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (5 of 8 remaining) [2023-08-26 18:03:07,897 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 8 remaining) [2023-08-26 18:03:07,897 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 8 remaining) [2023-08-26 18:03:07,897 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 8 remaining) [2023-08-26 18:03:07,898 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (1 of 8 remaining) [2023-08-26 18:03:07,898 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (0 of 8 remaining) [2023-08-26 18:03:07,898 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2023-08-26 18:03:07,898 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 18:03:07,898 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:03:07,900 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 77 places, 67 transitions, 179 flow [2023-08-26 18:03:07,907 INFO L124 PetriNetUnfolderBase]: 6/135 cut-off events. [2023-08-26 18:03:07,907 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-26 18:03:07,907 INFO L83 FinitePrefix]: Finished finitePrefix Result has 166 conditions, 135 events. 6/135 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 233 event pairs, 0 based on Foata normal form. 0/106 useless extension candidates. Maximal degree in co-relation 126. Up to 12 conditions per place. [2023-08-26 18:03:07,907 INFO L82 GeneralOperation]: Start removeDead. Operand has 77 places, 67 transitions, 179 flow [2023-08-26 18:03:07,908 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 70 places, 59 transitions, 163 flow [2023-08-26 18:03:07,908 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:03:07,908 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 70 places, 59 transitions, 163 flow [2023-08-26 18:03:07,908 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 70 places, 59 transitions, 163 flow [2023-08-26 18:03:07,908 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 70 places, 59 transitions, 163 flow [2023-08-26 18:03:07,913 INFO L124 PetriNetUnfolderBase]: 0/87 cut-off events. [2023-08-26 18:03:07,913 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-26 18:03:07,913 INFO L83 FinitePrefix]: Finished finitePrefix Result has 118 conditions, 87 events. 0/87 cut-off events. For 30/30 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 72 event pairs, 0 based on Foata normal form. 0/82 useless extension candidates. Maximal degree in co-relation 0. Up to 6 conditions per place. [2023-08-26 18:03:07,914 INFO L119 LiptonReduction]: Number of co-enabled transitions 1610 [2023-08-26 18:03:09,142 INFO L134 LiptonReduction]: Checked pairs total: 4266 [2023-08-26 18:03:09,142 INFO L136 LiptonReduction]: Total number of compositions: 38 [2023-08-26 18:03:09,144 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:03:09,144 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;@28ccc219, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:03:09,144 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:03:09,148 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:03:09,148 INFO L124 PetriNetUnfolderBase]: 0/35 cut-off events. [2023-08-26 18:03:09,148 INFO L125 PetriNetUnfolderBase]: For 30/30 co-relation queries the response was YES. [2023-08-26 18:03:09,148 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:03:09,149 INFO L208 CegarLoopForPetriNet]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:03:09,149 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:03:09,149 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:03:09,149 INFO L85 PathProgramCache]: Analyzing trace with hash 814966816, now seen corresponding path program 1 times [2023-08-26 18:03:09,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:03:09,149 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [66873413] [2023-08-26 18:03:09,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:03:09,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:03:09,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:03:09,166 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:03:09,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:03:09,180 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:03:09,180 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:03:09,180 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:03:09,180 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2023-08-26 18:03:09,180 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:03:09,182 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:03:09,182 WARN L233 ceAbstractionStarter]: 5 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:03:09,183 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 6 thread instances. [2023-08-26 18:03:09,207 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 18:03:09,208 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 87 places, 75 transitions, 210 flow [2023-08-26 18:03:09,219 INFO L124 PetriNetUnfolderBase]: 7/157 cut-off events. [2023-08-26 18:03:09,219 INFO L125 PetriNetUnfolderBase]: For 50/50 co-relation queries the response was YES. [2023-08-26 18:03:09,220 INFO L83 FinitePrefix]: Finished finitePrefix Result has 197 conditions, 157 events. 7/157 cut-off events. For 50/50 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 285 event pairs, 0 based on Foata normal form. 0/123 useless extension candidates. Maximal degree in co-relation 156. Up to 14 conditions per place. [2023-08-26 18:03:09,220 INFO L82 GeneralOperation]: Start removeDead. Operand has 87 places, 75 transitions, 210 flow [2023-08-26 18:03:09,220 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 87 places, 75 transitions, 210 flow [2023-08-26 18:03:09,221 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:03:09,221 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 87 places, 75 transitions, 210 flow [2023-08-26 18:03:09,222 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 87 places, 75 transitions, 210 flow [2023-08-26 18:03:09,222 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 87 places, 75 transitions, 210 flow [2023-08-26 18:03:09,233 INFO L124 PetriNetUnfolderBase]: 7/157 cut-off events. [2023-08-26 18:03:09,234 INFO L125 PetriNetUnfolderBase]: For 50/50 co-relation queries the response was YES. [2023-08-26 18:03:09,234 INFO L83 FinitePrefix]: Finished finitePrefix Result has 197 conditions, 157 events. 7/157 cut-off events. For 50/50 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 285 event pairs, 0 based on Foata normal form. 0/123 useless extension candidates. Maximal degree in co-relation 156. Up to 14 conditions per place. [2023-08-26 18:03:09,237 INFO L119 LiptonReduction]: Number of co-enabled transitions 2940 [2023-08-26 18:03:10,487 INFO L134 LiptonReduction]: Checked pairs total: 7784 [2023-08-26 18:03:10,487 INFO L136 LiptonReduction]: Total number of compositions: 48 [2023-08-26 18:03:10,488 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:03:10,488 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;@28ccc219, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:03:10,488 INFO L358 AbstractCegarLoop]: Starting to check reachability of 9 error locations. [2023-08-26 18:03:10,489 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:03:10,489 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 18:03:10,489 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:03:10,489 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:03:10,489 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:03:10,489 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 18:03:10,489 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:03:10,490 INFO L85 PathProgramCache]: Analyzing trace with hash 27577, now seen corresponding path program 1 times [2023-08-26 18:03:10,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:03:10,490 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695552275] [2023-08-26 18:03:10,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:03:10,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:03:10,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:03:10,512 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 18:03:10,512 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:03:10,512 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695552275] [2023-08-26 18:03:10,512 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [695552275] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:03:10,512 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:03:10,513 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:03:10,513 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396853561] [2023-08-26 18:03:10,513 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:03:10,513 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:03:10,513 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:03:10,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:03:10,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:03:10,514 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 46 out of 123 [2023-08-26 18:03:10,514 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 51 places, 38 transitions, 136 flow. Second operand has 3 states, 3 states have (on average 46.666666666666664) internal successors, (140), 3 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:10,514 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:03:10,514 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 46 of 123 [2023-08-26 18:03:10,514 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:03:16,527 INFO L124 PetriNetUnfolderBase]: 65538/89770 cut-off events. [2023-08-26 18:03:16,527 INFO L125 PetriNetUnfolderBase]: For 39518/39518 co-relation queries the response was YES. [2023-08-26 18:03:16,718 INFO L83 FinitePrefix]: Finished finitePrefix Result has 186945 conditions, 89770 events. 65538/89770 cut-off events. For 39518/39518 co-relation queries the response was YES. Maximal size of possible extension queue 4611. Compared 640796 event pairs, 65538 based on Foata normal form. 0/58368 useless extension candidates. Maximal degree in co-relation 40590. Up to 81921 conditions per place. [2023-08-26 18:03:17,131 INFO L140 encePairwiseOnDemand]: 120/123 looper letters, 26 selfloop transitions, 1 changer transitions 0/36 dead transitions. [2023-08-26 18:03:17,131 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 51 places, 36 transitions, 186 flow [2023-08-26 18:03:17,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:03:17,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:03:17,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 167 transitions. [2023-08-26 18:03:17,133 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.45257452574525747 [2023-08-26 18:03:17,133 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 167 transitions. [2023-08-26 18:03:17,133 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 167 transitions. [2023-08-26 18:03:17,134 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:03:17,134 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 167 transitions. [2023-08-26 18:03:17,134 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:17,135 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 123.0) internal successors, (492), 4 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:17,135 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 123.0) internal successors, (492), 4 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:17,135 INFO L175 Difference]: Start difference. First operand has 51 places, 38 transitions, 136 flow. Second operand 3 states and 167 transitions. [2023-08-26 18:03:17,135 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 51 places, 36 transitions, 186 flow [2023-08-26 18:03:17,186 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 51 places, 36 transitions, 156 flow, removed 15 selfloop flow, removed 0 redundant places. [2023-08-26 18:03:17,187 INFO L231 Difference]: Finished difference. Result has 51 places, 36 transitions, 104 flow [2023-08-26 18:03:17,187 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=123, PETRI_DIFFERENCE_MINUEND_FLOW=102, PETRI_DIFFERENCE_MINUEND_PLACES=49, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=36, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=35, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=104, PETRI_PLACES=51, PETRI_TRANSITIONS=36} [2023-08-26 18:03:17,188 INFO L281 CegarLoopForPetriNet]: 51 programPoint places, 0 predicate places. [2023-08-26 18:03:17,188 INFO L495 AbstractCegarLoop]: Abstraction has has 51 places, 36 transitions, 104 flow [2023-08-26 18:03:17,188 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 46.666666666666664) internal successors, (140), 3 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:17,188 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:03:17,188 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:03:17,188 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2023-08-26 18:03:17,189 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 18:03:17,189 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:03:17,189 INFO L85 PathProgramCache]: Analyzing trace with hash 27579, now seen corresponding path program 1 times [2023-08-26 18:03:17,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:03:17,189 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826985819] [2023-08-26 18:03:17,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:03:17,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:03:17,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:03:17,210 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 18:03:17,210 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:03:17,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826985819] [2023-08-26 18:03:17,210 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1826985819] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:03:17,211 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:03:17,211 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:03:17,211 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049094845] [2023-08-26 18:03:17,211 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:03:17,211 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:03:17,211 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:03:17,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:03:17,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:03:17,212 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 45 out of 123 [2023-08-26 18:03:17,212 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 51 places, 36 transitions, 104 flow. Second operand has 3 states, 3 states have (on average 45.666666666666664) internal successors, (137), 3 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:17,212 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:03:17,212 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 45 of 123 [2023-08-26 18:03:17,212 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:03:20,846 INFO L124 PetriNetUnfolderBase]: 42327/59733 cut-off events. [2023-08-26 18:03:20,847 INFO L125 PetriNetUnfolderBase]: For 3410/3410 co-relation queries the response was YES. [2023-08-26 18:03:21,019 INFO L83 FinitePrefix]: Finished finitePrefix Result has 118110 conditions, 59733 events. 42327/59733 cut-off events. For 3410/3410 co-relation queries the response was YES. Maximal size of possible extension queue 3228. Compared 429358 event pairs, 42327 based on Foata normal form. 0/41529 useless extension candidates. Maximal degree in co-relation 118098. Up to 53249 conditions per place. [2023-08-26 18:03:21,446 INFO L140 encePairwiseOnDemand]: 121/123 looper letters, 25 selfloop transitions, 1 changer transitions 0/35 dead transitions. [2023-08-26 18:03:21,446 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 52 places, 35 transitions, 154 flow [2023-08-26 18:03:21,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:03:21,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:03:21,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 162 transitions. [2023-08-26 18:03:21,447 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.43902439024390244 [2023-08-26 18:03:21,447 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 162 transitions. [2023-08-26 18:03:21,447 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 162 transitions. [2023-08-26 18:03:21,447 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:03:21,447 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 162 transitions. [2023-08-26 18:03:21,448 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 54.0) internal successors, (162), 3 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:21,448 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 123.0) internal successors, (492), 4 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:21,449 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 123.0) internal successors, (492), 4 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:21,449 INFO L175 Difference]: Start difference. First operand has 51 places, 36 transitions, 104 flow. Second operand 3 states and 162 transitions. [2023-08-26 18:03:21,449 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 52 places, 35 transitions, 154 flow [2023-08-26 18:03:21,454 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 51 places, 35 transitions, 153 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:03:21,455 INFO L231 Difference]: Finished difference. Result has 51 places, 35 transitions, 103 flow [2023-08-26 18:03:21,455 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=123, PETRI_DIFFERENCE_MINUEND_FLOW=101, PETRI_DIFFERENCE_MINUEND_PLACES=49, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=35, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=34, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=103, PETRI_PLACES=51, PETRI_TRANSITIONS=35} [2023-08-26 18:03:21,456 INFO L281 CegarLoopForPetriNet]: 51 programPoint places, 0 predicate places. [2023-08-26 18:03:21,456 INFO L495 AbstractCegarLoop]: Abstraction has has 51 places, 35 transitions, 103 flow [2023-08-26 18:03:21,456 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 45.666666666666664) internal successors, (137), 3 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:21,456 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:03:21,456 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 18:03:21,456 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2023-08-26 18:03:21,456 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 18:03:21,457 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:03:21,457 INFO L85 PathProgramCache]: Analyzing trace with hash 26527398, now seen corresponding path program 1 times [2023-08-26 18:03:21,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:03:21,457 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610463394] [2023-08-26 18:03:21,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:03:21,457 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:03:21,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:03:21,487 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 18:03:21,487 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:03:21,487 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610463394] [2023-08-26 18:03:21,487 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610463394] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:03:21,488 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:03:21,488 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:03:21,488 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175021930] [2023-08-26 18:03:21,488 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:03:21,488 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:03:21,488 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:03:21,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:03:21,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:03:21,489 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 48 out of 123 [2023-08-26 18:03:21,489 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 51 places, 35 transitions, 103 flow. Second operand has 3 states, 3 states have (on average 49.333333333333336) internal successors, (148), 3 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:21,489 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:03:21,489 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 48 of 123 [2023-08-26 18:03:21,490 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:03:23,985 INFO L124 PetriNetUnfolderBase]: 32246/41520 cut-off events. [2023-08-26 18:03:23,985 INFO L125 PetriNetUnfolderBase]: For 3127/3127 co-relation queries the response was YES. [2023-08-26 18:03:24,122 INFO L83 FinitePrefix]: Finished finitePrefix Result has 85990 conditions, 41520 events. 32246/41520 cut-off events. For 3127/3127 co-relation queries the response was YES. Maximal size of possible extension queue 2609. Compared 232810 event pairs, 10687 based on Foata normal form. 0/29993 useless extension candidates. Maximal degree in co-relation 85977. Up to 40404 conditions per place. [2023-08-26 18:03:24,425 INFO L140 encePairwiseOnDemand]: 110/123 looper letters, 37 selfloop transitions, 7 changer transitions 0/53 dead transitions. [2023-08-26 18:03:24,425 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 53 places, 53 transitions, 252 flow [2023-08-26 18:03:24,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:03:24,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:03:24,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 194 transitions. [2023-08-26 18:03:24,427 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5257452574525745 [2023-08-26 18:03:24,427 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 194 transitions. [2023-08-26 18:03:24,427 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 194 transitions. [2023-08-26 18:03:24,427 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:03:24,427 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 194 transitions. [2023-08-26 18:03:24,428 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 64.66666666666667) internal successors, (194), 3 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:24,429 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 123.0) internal successors, (492), 4 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:24,429 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 123.0) internal successors, (492), 4 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:24,429 INFO L175 Difference]: Start difference. First operand has 51 places, 35 transitions, 103 flow. Second operand 3 states and 194 transitions. [2023-08-26 18:03:24,429 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 53 places, 53 transitions, 252 flow [2023-08-26 18:03:24,432 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 52 places, 53 transitions, 251 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:03:24,432 INFO L231 Difference]: Finished difference. Result has 53 places, 41 transitions, 159 flow [2023-08-26 18:03:24,433 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=123, PETRI_DIFFERENCE_MINUEND_FLOW=102, PETRI_DIFFERENCE_MINUEND_PLACES=50, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=35, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=28, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=159, PETRI_PLACES=53, PETRI_TRANSITIONS=41} [2023-08-26 18:03:24,433 INFO L281 CegarLoopForPetriNet]: 51 programPoint places, 2 predicate places. [2023-08-26 18:03:24,433 INFO L495 AbstractCegarLoop]: Abstraction has has 53 places, 41 transitions, 159 flow [2023-08-26 18:03:24,433 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 49.333333333333336) internal successors, (148), 3 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:24,433 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:03:24,433 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:03:24,434 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2023-08-26 18:03:24,434 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 5 more)] === [2023-08-26 18:03:24,434 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:03:24,434 INFO L85 PathProgramCache]: Analyzing trace with hash 328446945, now seen corresponding path program 1 times [2023-08-26 18:03:24,434 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:03:24,434 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851866780] [2023-08-26 18:03:24,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:03:24,435 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:03:24,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:03:24,460 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-08-26 18:03:24,461 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:03:24,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851866780] [2023-08-26 18:03:24,461 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1851866780] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:03:24,461 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:03:24,461 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:03:24,461 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911528448] [2023-08-26 18:03:24,461 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:03:24,462 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:03:24,462 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:03:24,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:03:24,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:03:24,463 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 48 out of 123 [2023-08-26 18:03:24,463 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 53 places, 41 transitions, 159 flow. Second operand has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 3 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:24,463 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:03:24,463 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 48 of 123 [2023-08-26 18:03:24,463 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:03:27,745 INFO L124 PetriNetUnfolderBase]: 42327/53407 cut-off events. [2023-08-26 18:03:27,745 INFO L125 PetriNetUnfolderBase]: For 13148/13148 co-relation queries the response was YES. [2023-08-26 18:03:27,906 INFO L83 FinitePrefix]: Finished finitePrefix Result has 130279 conditions, 53407 events. 42327/53407 cut-off events. For 13148/13148 co-relation queries the response was YES. Maximal size of possible extension queue 2248. Compared 279853 event pairs, 11441 based on Foata normal form. 11464/64736 useless extension candidates. Maximal degree in co-relation 130264. Up to 52416 conditions per place. [2023-08-26 18:03:27,937 INFO L140 encePairwiseOnDemand]: 111/123 looper letters, 0 selfloop transitions, 0 changer transitions 53/53 dead transitions. [2023-08-26 18:03:27,937 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 53 transitions, 296 flow [2023-08-26 18:03:27,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:03:27,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:03:27,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 194 transitions. [2023-08-26 18:03:27,939 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.5257452574525745 [2023-08-26 18:03:27,939 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 194 transitions. [2023-08-26 18:03:27,939 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 194 transitions. [2023-08-26 18:03:27,939 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:03:27,939 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 194 transitions. [2023-08-26 18:03:27,940 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 64.66666666666667) internal successors, (194), 3 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:27,942 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 123.0) internal successors, (492), 4 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:27,943 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 123.0) internal successors, (492), 4 states have internal predecessors, (492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:27,943 INFO L175 Difference]: Start difference. First operand has 53 places, 41 transitions, 159 flow. Second operand 3 states and 194 transitions. [2023-08-26 18:03:27,943 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 53 transitions, 296 flow [2023-08-26 18:03:27,953 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 48 places, 53 transitions, 289 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:03:27,954 INFO L231 Difference]: Finished difference. Result has 48 places, 0 transitions, 0 flow [2023-08-26 18:03:27,954 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=123, PETRI_DIFFERENCE_MINUEND_FLOW=128, PETRI_DIFFERENCE_MINUEND_PLACES=46, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=35, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=35, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=48, PETRI_TRANSITIONS=0} [2023-08-26 18:03:27,954 INFO L281 CegarLoopForPetriNet]: 51 programPoint places, -3 predicate places. [2023-08-26 18:03:27,954 INFO L495 AbstractCegarLoop]: Abstraction has has 48 places, 0 transitions, 0 flow [2023-08-26 18:03:27,955 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 3 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:27,955 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 9 remaining) [2023-08-26 18:03:27,956 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (7 of 9 remaining) [2023-08-26 18:03:27,956 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (6 of 9 remaining) [2023-08-26 18:03:27,956 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (5 of 9 remaining) [2023-08-26 18:03:27,956 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 9 remaining) [2023-08-26 18:03:27,956 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 9 remaining) [2023-08-26 18:03:27,958 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 9 remaining) [2023-08-26 18:03:27,958 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (1 of 9 remaining) [2023-08-26 18:03:27,959 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 9 remaining) [2023-08-26 18:03:27,959 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2023-08-26 18:03:27,959 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 18:03:27,961 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:03:27,962 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 87 places, 75 transitions, 210 flow [2023-08-26 18:03:27,974 INFO L124 PetriNetUnfolderBase]: 7/157 cut-off events. [2023-08-26 18:03:27,974 INFO L125 PetriNetUnfolderBase]: For 50/50 co-relation queries the response was YES. [2023-08-26 18:03:27,975 INFO L83 FinitePrefix]: Finished finitePrefix Result has 197 conditions, 157 events. 7/157 cut-off events. For 50/50 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 285 event pairs, 0 based on Foata normal form. 0/123 useless extension candidates. Maximal degree in co-relation 156. Up to 14 conditions per place. [2023-08-26 18:03:27,975 INFO L82 GeneralOperation]: Start removeDead. Operand has 87 places, 75 transitions, 210 flow [2023-08-26 18:03:27,975 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 80 places, 67 transitions, 194 flow [2023-08-26 18:03:27,975 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:03:27,976 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 80 places, 67 transitions, 194 flow [2023-08-26 18:03:27,976 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 80 places, 67 transitions, 194 flow [2023-08-26 18:03:27,976 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 80 places, 67 transitions, 194 flow [2023-08-26 18:03:27,987 INFO L124 PetriNetUnfolderBase]: 0/101 cut-off events. [2023-08-26 18:03:27,987 INFO L125 PetriNetUnfolderBase]: For 50/50 co-relation queries the response was YES. [2023-08-26 18:03:27,988 INFO L83 FinitePrefix]: Finished finitePrefix Result has 141 conditions, 101 events. 0/101 cut-off events. For 50/50 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 86 event pairs, 0 based on Foata normal form. 0/95 useless extension candidates. Maximal degree in co-relation 0. Up to 7 conditions per place. [2023-08-26 18:03:27,989 INFO L119 LiptonReduction]: Number of co-enabled transitions 2268 [2023-08-26 18:03:29,277 INFO L134 LiptonReduction]: Checked pairs total: 6010 [2023-08-26 18:03:29,277 INFO L136 LiptonReduction]: Total number of compositions: 42 [2023-08-26 18:03:29,279 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:03:29,279 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;@28ccc219, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:03:29,279 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:03:29,283 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:03:29,283 INFO L124 PetriNetUnfolderBase]: 0/42 cut-off events. [2023-08-26 18:03:29,283 INFO L125 PetriNetUnfolderBase]: For 50/50 co-relation queries the response was YES. [2023-08-26 18:03:29,283 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:03:29,283 INFO L208 CegarLoopForPetriNet]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:03:29,283 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:03:29,284 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:03:29,284 INFO L85 PathProgramCache]: Analyzing trace with hash 1456268894, now seen corresponding path program 1 times [2023-08-26 18:03:29,284 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:03:29,284 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [859596541] [2023-08-26 18:03:29,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:03:29,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:03:29,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:03:29,297 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:03:29,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:03:29,308 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:03:29,308 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:03:29,308 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:03:29,308 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2023-08-26 18:03:29,309 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:03:29,309 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:03:29,309 WARN L233 ceAbstractionStarter]: 6 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:03:29,309 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 7 thread instances. [2023-08-26 18:03:29,327 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 18:03:29,329 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 97 places, 83 transitions, 243 flow [2023-08-26 18:03:29,343 INFO L124 PetriNetUnfolderBase]: 8/179 cut-off events. [2023-08-26 18:03:29,343 INFO L125 PetriNetUnfolderBase]: For 77/77 co-relation queries the response was YES. [2023-08-26 18:03:29,344 INFO L83 FinitePrefix]: Finished finitePrefix Result has 229 conditions, 179 events. 8/179 cut-off events. For 77/77 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 333 event pairs, 0 based on Foata normal form. 0/140 useless extension candidates. Maximal degree in co-relation 187. Up to 16 conditions per place. [2023-08-26 18:03:29,344 INFO L82 GeneralOperation]: Start removeDead. Operand has 97 places, 83 transitions, 243 flow [2023-08-26 18:03:29,345 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 97 places, 83 transitions, 243 flow [2023-08-26 18:03:29,345 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:03:29,345 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 97 places, 83 transitions, 243 flow [2023-08-26 18:03:29,345 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 97 places, 83 transitions, 243 flow [2023-08-26 18:03:29,345 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 97 places, 83 transitions, 243 flow [2023-08-26 18:03:29,359 INFO L124 PetriNetUnfolderBase]: 8/179 cut-off events. [2023-08-26 18:03:29,359 INFO L125 PetriNetUnfolderBase]: For 77/77 co-relation queries the response was YES. [2023-08-26 18:03:29,360 INFO L83 FinitePrefix]: Finished finitePrefix Result has 229 conditions, 179 events. 8/179 cut-off events. For 77/77 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 333 event pairs, 0 based on Foata normal form. 0/140 useless extension candidates. Maximal degree in co-relation 187. Up to 16 conditions per place. [2023-08-26 18:03:29,363 INFO L119 LiptonReduction]: Number of co-enabled transitions 3822 [2023-08-26 18:03:30,700 INFO L134 LiptonReduction]: Checked pairs total: 9027 [2023-08-26 18:03:30,700 INFO L136 LiptonReduction]: Total number of compositions: 52 [2023-08-26 18:03:30,701 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:03:30,701 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;@28ccc219, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:03:30,702 INFO L358 AbstractCegarLoop]: Starting to check reachability of 10 error locations. [2023-08-26 18:03:30,702 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:03:30,702 INFO L124 PetriNetUnfolderBase]: 0/1 cut-off events. [2023-08-26 18:03:30,702 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:03:30,702 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:03:30,703 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:03:30,703 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 6 more)] === [2023-08-26 18:03:30,703 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:03:30,703 INFO L85 PathProgramCache]: Analyzing trace with hash 33497, now seen corresponding path program 1 times [2023-08-26 18:03:30,703 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:03:30,703 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555071774] [2023-08-26 18:03:30,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:03:30,703 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:03:30,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:03:30,727 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 18:03:30,727 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:03:30,727 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555071774] [2023-08-26 18:03:30,727 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1555071774] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:03:30,727 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:03:30,727 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:03:30,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115759682] [2023-08-26 18:03:30,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:03:30,728 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:03:30,728 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:03:30,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:03:30,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:03:30,729 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 50 out of 135 [2023-08-26 18:03:30,729 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 58 places, 43 transitions, 163 flow. Second operand has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 3 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:03:30,729 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:03:30,729 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 50 of 135 [2023-08-26 18:03:30,729 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:04:00,875 INFO L124 PetriNetUnfolderBase]: 311298/408234 cut-off events. [2023-08-26 18:04:00,875 INFO L125 PetriNetUnfolderBase]: For 217694/217694 co-relation queries the response was YES. [2023-08-26 18:04:02,147 INFO L83 FinitePrefix]: Finished finitePrefix Result has 855618 conditions, 408234 events. 311298/408234 cut-off events. For 217694/217694 co-relation queries the response was YES. Maximal size of possible extension queue 17385. Compared 3003394 event pairs, 311298 based on Foata normal form. 0/266240 useless extension candidates. Maximal degree in co-relation 189326. Up to 376833 conditions per place. [2023-08-26 18:04:04,203 INFO L140 encePairwiseOnDemand]: 132/135 looper letters, 30 selfloop transitions, 1 changer transitions 0/41 dead transitions. [2023-08-26 18:04:04,203 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 58 places, 41 transitions, 221 flow [2023-08-26 18:04:04,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:04:04,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:04:04,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 183 transitions. [2023-08-26 18:04:04,204 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.45185185185185184 [2023-08-26 18:04:04,204 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 183 transitions. [2023-08-26 18:04:04,204 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 183 transitions. [2023-08-26 18:04:04,204 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:04:04,204 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 183 transitions. [2023-08-26 18:04:04,205 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 61.0) internal successors, (183), 3 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:04,205 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 135.0) internal successors, (540), 4 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:04,205 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 135.0) internal successors, (540), 4 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:04,205 INFO L175 Difference]: Start difference. First operand has 58 places, 43 transitions, 163 flow. Second operand 3 states and 183 transitions. [2023-08-26 18:04:04,206 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 58 places, 41 transitions, 221 flow [2023-08-26 18:04:04,529 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 58 places, 41 transitions, 179 flow, removed 21 selfloop flow, removed 0 redundant places. [2023-08-26 18:04:04,529 INFO L231 Difference]: Finished difference. Result has 58 places, 41 transitions, 119 flow [2023-08-26 18:04:04,530 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=135, PETRI_DIFFERENCE_MINUEND_FLOW=117, PETRI_DIFFERENCE_MINUEND_PLACES=56, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=40, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=119, PETRI_PLACES=58, PETRI_TRANSITIONS=41} [2023-08-26 18:04:04,530 INFO L281 CegarLoopForPetriNet]: 58 programPoint places, 0 predicate places. [2023-08-26 18:04:04,530 INFO L495 AbstractCegarLoop]: Abstraction has has 58 places, 41 transitions, 119 flow [2023-08-26 18:04:04,530 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 3 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:04,530 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:04:04,530 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:04:04,531 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2023-08-26 18:04:04,531 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 6 more)] === [2023-08-26 18:04:04,531 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:04:04,531 INFO L85 PathProgramCache]: Analyzing trace with hash 33498, now seen corresponding path program 1 times [2023-08-26 18:04:04,531 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:04:04,531 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637481258] [2023-08-26 18:04:04,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:04:04,531 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:04:04,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:04:04,564 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 18:04:04,564 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:04:04,565 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637481258] [2023-08-26 18:04:04,565 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1637481258] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:04:04,565 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:04:04,565 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:04:04,565 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923315640] [2023-08-26 18:04:04,565 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:04:04,565 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:04:04,566 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:04:04,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:04:04,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:04:04,566 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 51 out of 135 [2023-08-26 18:04:04,566 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 58 places, 41 transitions, 119 flow. Second operand has 3 states, 3 states have (on average 51.666666666666664) internal successors, (155), 3 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:04,567 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:04:04,567 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 51 of 135 [2023-08-26 18:04:04,567 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:04:23,038 INFO L124 PetriNetUnfolderBase]: 202071/271701 cut-off events. [2023-08-26 18:04:23,038 INFO L125 PetriNetUnfolderBase]: For 13650/13650 co-relation queries the response was YES. [2023-08-26 18:04:23,939 INFO L83 FinitePrefix]: Finished finitePrefix Result has 537951 conditions, 271701 events. 202071/271701 cut-off events. For 13650/13650 co-relation queries the response was YES. Maximal size of possible extension queue 12245. Compared 2033451 event pairs, 202071 based on Foata normal form. 0/187961 useless extension candidates. Maximal degree in co-relation 537938. Up to 245761 conditions per place. [2023-08-26 18:04:25,092 INFO L140 encePairwiseOnDemand]: 133/135 looper letters, 29 selfloop transitions, 1 changer transitions 0/40 dead transitions. [2023-08-26 18:04:25,092 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 59 places, 40 transitions, 177 flow [2023-08-26 18:04:25,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:04:25,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:04:25,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 184 transitions. [2023-08-26 18:04:25,093 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.454320987654321 [2023-08-26 18:04:25,093 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 184 transitions. [2023-08-26 18:04:25,093 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 184 transitions. [2023-08-26 18:04:25,093 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:04:25,093 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 184 transitions. [2023-08-26 18:04:25,094 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 61.333333333333336) internal successors, (184), 3 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:25,095 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 135.0) internal successors, (540), 4 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:25,095 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 135.0) internal successors, (540), 4 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:25,095 INFO L175 Difference]: Start difference. First operand has 58 places, 41 transitions, 119 flow. Second operand 3 states and 184 transitions. [2023-08-26 18:04:25,095 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 59 places, 40 transitions, 177 flow [2023-08-26 18:04:25,096 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 58 places, 40 transitions, 176 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:04:25,096 INFO L231 Difference]: Finished difference. Result has 58 places, 40 transitions, 118 flow [2023-08-26 18:04:25,096 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=135, PETRI_DIFFERENCE_MINUEND_FLOW=116, PETRI_DIFFERENCE_MINUEND_PLACES=56, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=40, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=39, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=118, PETRI_PLACES=58, PETRI_TRANSITIONS=40} [2023-08-26 18:04:25,097 INFO L281 CegarLoopForPetriNet]: 58 programPoint places, 0 predicate places. [2023-08-26 18:04:25,097 INFO L495 AbstractCegarLoop]: Abstraction has has 58 places, 40 transitions, 118 flow [2023-08-26 18:04:25,097 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 51.666666666666664) internal successors, (155), 3 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:25,097 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:04:25,097 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2023-08-26 18:04:25,098 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2023-08-26 18:04:25,098 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 6 more)] === [2023-08-26 18:04:25,098 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:04:25,098 INFO L85 PathProgramCache]: Analyzing trace with hash 32223245, now seen corresponding path program 1 times [2023-08-26 18:04:25,098 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:04:25,098 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2062569470] [2023-08-26 18:04:25,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:04:25,098 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:04:25,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:04:25,123 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 18:04:25,124 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:04:25,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2062569470] [2023-08-26 18:04:25,124 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2062569470] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:04:25,124 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:04:25,124 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:04:25,124 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730355117] [2023-08-26 18:04:25,124 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:04:25,124 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:04:25,125 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:04:25,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:04:25,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:04:25,125 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 52 out of 135 [2023-08-26 18:04:25,126 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 58 places, 40 transitions, 118 flow. Second operand has 3 states, 3 states have (on average 53.333333333333336) internal successors, (160), 3 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:25,126 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:04:25,126 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 52 of 135 [2023-08-26 18:04:25,126 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:04:38,946 INFO L124 PetriNetUnfolderBase]: 164558/202770 cut-off events. [2023-08-26 18:04:38,947 INFO L125 PetriNetUnfolderBase]: For 13356/13356 co-relation queries the response was YES. [2023-08-26 18:04:39,766 INFO L83 FinitePrefix]: Finished finitePrefix Result has 418528 conditions, 202770 events. 164558/202770 cut-off events. For 13356/13356 co-relation queries the response was YES. Maximal size of possible extension queue 10263. Compared 1152861 event pairs, 60109 based on Foata normal form. 0/144041 useless extension candidates. Maximal degree in co-relation 418514. Up to 200278 conditions per place. [2023-08-26 18:04:40,806 INFO L140 encePairwiseOnDemand]: 120/135 looper letters, 43 selfloop transitions, 8 changer transitions 0/61 dead transitions. [2023-08-26 18:04:40,806 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 60 places, 61 transitions, 292 flow [2023-08-26 18:04:40,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:04:40,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:04:40,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 214 transitions. [2023-08-26 18:04:40,808 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.528395061728395 [2023-08-26 18:04:40,808 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 214 transitions. [2023-08-26 18:04:40,808 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 214 transitions. [2023-08-26 18:04:40,808 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:04:40,808 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 214 transitions. [2023-08-26 18:04:40,809 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 71.33333333333333) internal successors, (214), 3 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:40,810 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 135.0) internal successors, (540), 4 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:40,810 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 135.0) internal successors, (540), 4 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:40,810 INFO L175 Difference]: Start difference. First operand has 58 places, 40 transitions, 118 flow. Second operand 3 states and 214 transitions. [2023-08-26 18:04:40,810 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 60 places, 61 transitions, 292 flow [2023-08-26 18:04:40,846 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 59 places, 61 transitions, 291 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:04:40,847 INFO L231 Difference]: Finished difference. Result has 60 places, 47 transitions, 183 flow [2023-08-26 18:04:40,848 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=135, PETRI_DIFFERENCE_MINUEND_FLOW=117, PETRI_DIFFERENCE_MINUEND_PLACES=57, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=40, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=32, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=183, PETRI_PLACES=60, PETRI_TRANSITIONS=47} [2023-08-26 18:04:40,848 INFO L281 CegarLoopForPetriNet]: 58 programPoint places, 2 predicate places. [2023-08-26 18:04:40,848 INFO L495 AbstractCegarLoop]: Abstraction has has 60 places, 47 transitions, 183 flow [2023-08-26 18:04:40,848 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 53.333333333333336) internal successors, (160), 3 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:40,848 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:04:40,848 INFO L208 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:04:40,849 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2023-08-26 18:04:40,849 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting thr1Err0ASSERT_VIOLATIONASSERT === [thr1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 6 more)] === [2023-08-26 18:04:40,849 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:04:40,849 INFO L85 PathProgramCache]: Analyzing trace with hash -1526535991, now seen corresponding path program 1 times [2023-08-26 18:04:40,849 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:04:40,849 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530593081] [2023-08-26 18:04:40,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:04:40,849 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:04:40,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:04:40,892 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-08-26 18:04:40,892 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:04:40,892 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530593081] [2023-08-26 18:04:40,892 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530593081] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:04:40,893 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:04:40,893 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-08-26 18:04:40,893 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783928945] [2023-08-26 18:04:40,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:04:40,893 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:04:40,893 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:04:40,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:04:40,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:04:40,894 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 52 out of 135 [2023-08-26 18:04:40,894 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 60 places, 47 transitions, 183 flow. Second operand has 3 states, 3 states have (on average 54.666666666666664) internal successors, (164), 3 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:40,894 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:04:40,894 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 52 of 135 [2023-08-26 18:04:40,894 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2023-08-26 18:04:56,260 INFO L124 PetriNetUnfolderBase]: 202071/246079 cut-off events. [2023-08-26 18:04:56,260 INFO L125 PetriNetUnfolderBase]: For 64830/64830 co-relation queries the response was YES. [2023-08-26 18:04:57,285 INFO L83 FinitePrefix]: Finished finitePrefix Result has 595334 conditions, 246079 events. 202071/246079 cut-off events. For 64830/64830 co-relation queries the response was YES. Maximal size of possible extension queue 8505. Compared 1320035 event pairs, 60901 based on Foata normal form. 58602/304353 useless extension candidates. Maximal degree in co-relation 595318. Up to 243840 conditions per place. [2023-08-26 18:04:57,441 INFO L140 encePairwiseOnDemand]: 121/135 looper letters, 0 selfloop transitions, 0 changer transitions 61/61 dead transitions. [2023-08-26 18:04:57,441 INFO L145 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 61 transitions, 343 flow [2023-08-26 18:04:57,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-08-26 18:04:57,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2023-08-26 18:04:57,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 214 transitions. [2023-08-26 18:04:57,443 INFO L516 CegarLoopForPetriNet]: DFA transition density 0.528395061728395 [2023-08-26 18:04:57,443 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 214 transitions. [2023-08-26 18:04:57,443 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 214 transitions. [2023-08-26 18:04:57,443 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2023-08-26 18:04:57,443 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 214 transitions. [2023-08-26 18:04:57,444 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 71.33333333333333) internal successors, (214), 3 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:57,444 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 135.0) internal successors, (540), 4 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:57,445 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 135.0) internal successors, (540), 4 states have internal predecessors, (540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:57,445 INFO L175 Difference]: Start difference. First operand has 60 places, 47 transitions, 183 flow. Second operand 3 states and 214 transitions. [2023-08-26 18:04:57,445 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 55 places, 61 transitions, 343 flow [2023-08-26 18:04:57,494 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 54 places, 61 transitions, 335 flow, removed 0 selfloop flow, removed 1 redundant places. [2023-08-26 18:04:57,494 INFO L231 Difference]: Finished difference. Result has 54 places, 0 transitions, 0 flow [2023-08-26 18:04:57,494 INFO L264 CegarLoopForPetriNet]: {PETRI_ALPHABET=135, PETRI_DIFFERENCE_MINUEND_FLOW=147, PETRI_DIFFERENCE_MINUEND_PLACES=52, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=40, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=40, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=54, PETRI_TRANSITIONS=0} [2023-08-26 18:04:57,495 INFO L281 CegarLoopForPetriNet]: 58 programPoint places, -4 predicate places. [2023-08-26 18:04:57,495 INFO L495 AbstractCegarLoop]: Abstraction has has 54 places, 0 transitions, 0 flow [2023-08-26 18:04:57,495 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 54.666666666666664) internal successors, (164), 3 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:04:57,495 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (9 of 10 remaining) [2023-08-26 18:04:57,495 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 10 remaining) [2023-08-26 18:04:57,495 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (7 of 10 remaining) [2023-08-26 18:04:57,495 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (6 of 10 remaining) [2023-08-26 18:04:57,496 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (5 of 10 remaining) [2023-08-26 18:04:57,496 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (4 of 10 remaining) [2023-08-26 18:04:57,496 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (3 of 10 remaining) [2023-08-26 18:04:57,496 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (2 of 10 remaining) [2023-08-26 18:04:57,496 INFO L805 garLoopResultBuilder]: Registering result SAFE for location thr1Err0ASSERT_VIOLATIONASSERT (1 of 10 remaining) [2023-08-26 18:04:57,496 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (0 of 10 remaining) [2023-08-26 18:04:57,496 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2023-08-26 18:04:57,496 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-08-26 18:04:57,497 INFO L307 ceAbstractionStarter]: Result for error location AllErrorsAtOnce was SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE,SAFE (1/2) [2023-08-26 18:04:57,498 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 97 places, 83 transitions, 243 flow [2023-08-26 18:04:57,508 INFO L124 PetriNetUnfolderBase]: 8/179 cut-off events. [2023-08-26 18:04:57,508 INFO L125 PetriNetUnfolderBase]: For 77/77 co-relation queries the response was YES. [2023-08-26 18:04:57,509 INFO L83 FinitePrefix]: Finished finitePrefix Result has 229 conditions, 179 events. 8/179 cut-off events. For 77/77 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 333 event pairs, 0 based on Foata normal form. 0/140 useless extension candidates. Maximal degree in co-relation 187. Up to 16 conditions per place. [2023-08-26 18:04:57,509 INFO L82 GeneralOperation]: Start removeDead. Operand has 97 places, 83 transitions, 243 flow [2023-08-26 18:04:57,509 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 90 places, 75 transitions, 227 flow [2023-08-26 18:04:57,510 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:04:57,510 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 90 places, 75 transitions, 227 flow [2023-08-26 18:04:57,510 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 90 places, 75 transitions, 227 flow [2023-08-26 18:04:57,510 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 90 places, 75 transitions, 227 flow [2023-08-26 18:04:57,792 INFO L124 PetriNetUnfolderBase]: 0/115 cut-off events. [2023-08-26 18:04:57,792 INFO L125 PetriNetUnfolderBase]: For 77/77 co-relation queries the response was YES. [2023-08-26 18:04:57,793 INFO L83 FinitePrefix]: Finished finitePrefix Result has 165 conditions, 115 events. 0/115 cut-off events. For 77/77 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 104 event pairs, 0 based on Foata normal form. 0/108 useless extension candidates. Maximal degree in co-relation 0. Up to 8 conditions per place. [2023-08-26 18:04:57,795 INFO L119 LiptonReduction]: Number of co-enabled transitions 3038 [2023-08-26 18:04:59,121 INFO L134 LiptonReduction]: Checked pairs total: 8361 [2023-08-26 18:04:59,121 INFO L136 LiptonReduction]: Total number of compositions: 46 [2023-08-26 18:04:59,122 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == InUseError ======== [2023-08-26 18:04:59,123 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;@28ccc219, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:04:59,123 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-08-26 18:04:59,127 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:04:59,127 INFO L124 PetriNetUnfolderBase]: 0/50 cut-off events. [2023-08-26 18:04:59,127 INFO L125 PetriNetUnfolderBase]: For 77/77 co-relation queries the response was YES. [2023-08-26 18:04:59,127 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:04:59,127 INFO L208 CegarLoopForPetriNet]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-08-26 18:04:59,127 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES === [ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES] === [2023-08-26 18:04:59,127 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:04:59,127 INFO L85 PathProgramCache]: Analyzing trace with hash -464328472, now seen corresponding path program 1 times [2023-08-26 18:04:59,127 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:04:59,127 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124885873] [2023-08-26 18:04:59,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:04:59,128 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:04:59,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:04:59,141 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-08-26 18:04:59,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-08-26 18:04:59,153 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-08-26 18:04:59,153 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-08-26 18:04:59,154 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0INUSE_VIOLATIONSUFFICIENT_THREAD_INSTANCES (0 of 1 remaining) [2023-08-26 18:04:59,154 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2023-08-26 18:04:59,154 INFO L445 BasicCegarLoop]: Path program histogram: [1] [2023-08-26 18:04:59,154 INFO L307 ceAbstractionStarter]: Result for error location InUseError was UNSAFE (2/2) [2023-08-26 18:04:59,154 WARN L233 ceAbstractionStarter]: 7 thread instances were not sufficient, I will increase this number and restart the analysis [2023-08-26 18:04:59,154 INFO L515 ceAbstractionStarter]: Constructing petrified ICFG for 8 thread instances. [2023-08-26 18:04:59,173 INFO L144 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2023-08-26 18:04:59,174 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 107 places, 91 transitions, 278 flow [2023-08-26 18:04:59,187 INFO L124 PetriNetUnfolderBase]: 9/201 cut-off events. [2023-08-26 18:04:59,188 INFO L125 PetriNetUnfolderBase]: For 112/112 co-relation queries the response was YES. [2023-08-26 18:04:59,188 INFO L83 FinitePrefix]: Finished finitePrefix Result has 262 conditions, 201 events. 9/201 cut-off events. For 112/112 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 368 event pairs, 0 based on Foata normal form. 0/157 useless extension candidates. Maximal degree in co-relation 219. Up to 18 conditions per place. [2023-08-26 18:04:59,189 INFO L82 GeneralOperation]: Start removeDead. Operand has 107 places, 91 transitions, 278 flow [2023-08-26 18:04:59,189 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 107 places, 91 transitions, 278 flow [2023-08-26 18:04:59,189 INFO L124 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2023-08-26 18:04:59,189 INFO L131 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 107 places, 91 transitions, 278 flow [2023-08-26 18:04:59,190 INFO L113 LiptonReduction]: Starting Lipton reduction on Petri net that has 107 places, 91 transitions, 278 flow [2023-08-26 18:04:59,190 INFO L73 FinitePrefix]: Start finitePrefix. Operand has 107 places, 91 transitions, 278 flow [2023-08-26 18:04:59,200 INFO L124 PetriNetUnfolderBase]: 9/201 cut-off events. [2023-08-26 18:04:59,200 INFO L125 PetriNetUnfolderBase]: For 112/112 co-relation queries the response was YES. [2023-08-26 18:04:59,201 INFO L83 FinitePrefix]: Finished finitePrefix Result has 262 conditions, 201 events. 9/201 cut-off events. For 112/112 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 368 event pairs, 0 based on Foata normal form. 0/157 useless extension candidates. Maximal degree in co-relation 219. Up to 18 conditions per place. [2023-08-26 18:04:59,204 INFO L119 LiptonReduction]: Number of co-enabled transitions 4816 [2023-08-26 18:05:00,527 INFO L134 LiptonReduction]: Checked pairs total: 11694 [2023-08-26 18:05:00,527 INFO L136 LiptonReduction]: Total number of compositions: 56 [2023-08-26 18:05:00,528 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-08-26 18:05:00,529 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;@28ccc219, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-08-26 18:05:00,529 INFO L358 AbstractCegarLoop]: Starting to check reachability of 11 error locations. [2023-08-26 18:05:00,529 INFO L185 PetriNetUnfolderBase]: Found word, exiting Unfolder. [2023-08-26 18:05:00,529 INFO L124 PetriNetUnfolderBase]: 0/2 cut-off events. [2023-08-26 18:05:00,529 INFO L125 PetriNetUnfolderBase]: For 0/0 co-relation queries the response was YES. [2023-08-26 18:05:00,530 INFO L200 CegarLoopForPetriNet]: Found error trace [2023-08-26 18:05:00,530 INFO L208 CegarLoopForPetriNet]: trace histogram [1, 1] [2023-08-26 18:05:00,530 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT, thr1Err0ASSERT_VIOLATIONASSERT (and 7 more)] === [2023-08-26 18:05:00,530 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-08-26 18:05:00,530 INFO L85 PathProgramCache]: Analyzing trace with hash 39929, now seen corresponding path program 1 times [2023-08-26 18:05:00,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-08-26 18:05:00,530 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679587769] [2023-08-26 18:05:00,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-08-26 18:05:00,531 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-08-26 18:05:00,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-08-26 18:05:00,546 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 18:05:00,547 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-08-26 18:05:00,547 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679587769] [2023-08-26 18:05:00,547 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1679587769] provided 1 perfect and 0 imperfect interpolant sequences [2023-08-26 18:05:00,547 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-08-26 18:05:00,547 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-08-26 18:05:00,547 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111105445] [2023-08-26 18:05:00,547 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-08-26 18:05:00,547 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-08-26 18:05:00,547 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-08-26 18:05:00,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-08-26 18:05:00,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-08-26 18:05:00,548 INFO L471 CegarLoopForPetriNet]: Number of universal loopers: 55 out of 147 [2023-08-26 18:05:00,548 INFO L103 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 65 places, 48 transitions, 192 flow. Second operand has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-08-26 18:05:00,548 INFO L112 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2023-08-26 18:05:00,548 INFO L113 encePairwiseOnDemand]: Number of universal subtrahend loopers: 55 of 147 [2023-08-26 18:05:00,549 INFO L73 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand