/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-crafted/xor1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-d966a43 [2022-01-30 23:21:11,120 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-01-30 23:21:11,122 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-01-30 23:21:11,176 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-01-30 23:21:11,219 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2022-01-30 23:21:11,244 INFO L113 SettingsManager]: Loading preferences was successful [2022-01-30 23:21:11,245 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-01-30 23:21:11,245 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-01-30 23:21:11,245 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-01-30 23:21:11,246 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-01-30 23:21:11,246 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-01-30 23:21:11,246 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-01-30 23:21:11,246 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-01-30 23:21:11,246 INFO L138 SettingsManager]: * Use SBE=true [2022-01-30 23:21:11,246 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-01-30 23:21:11,247 INFO L138 SettingsManager]: * sizeof long=4 [2022-01-30 23:21:11,247 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-01-30 23:21:11,247 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-01-30 23:21:11,247 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-01-30 23:21:11,247 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-01-30 23:21:11,247 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-01-30 23:21:11,248 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-01-30 23:21:11,248 INFO L138 SettingsManager]: * sizeof long double=12 [2022-01-30 23:21:11,248 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-01-30 23:21:11,248 INFO L138 SettingsManager]: * Use constant arrays=true [2022-01-30 23:21:11,248 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-01-30 23:21:11,248 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-01-30 23:21:11,248 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-01-30 23:21:11,248 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-01-30 23:21:11,248 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-30 23:21:11,248 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-01-30 23:21:11,248 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-01-30 23:21:11,249 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-01-30 23:21:11,249 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-01-30 23:21:11,249 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-01-30 23:21:11,249 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2022-01-30 23:21:11,249 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-01-30 23:21:11,249 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-01-30 23:21:11,249 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-01-30 23:21:11,412 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-01-30 23:21:11,429 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-01-30 23:21:11,433 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-01-30 23:21:11,434 INFO L271 PluginConnector]: Initializing CDTParser... [2022-01-30 23:21:11,435 INFO L275 PluginConnector]: CDTParser initialized [2022-01-30 23:21:11,436 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/xor1.i [2022-01-30 23:21:11,499 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/94a2e48cf/dadfef8e90664c25aaaef875c2ec4189/FLAG4f251564d [2022-01-30 23:21:11,836 INFO L306 CDTParser]: Found 1 translation units. [2022-01-30 23:21:11,836 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/xor1.i [2022-01-30 23:21:11,840 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/94a2e48cf/dadfef8e90664c25aaaef875c2ec4189/FLAG4f251564d [2022-01-30 23:21:12,216 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/94a2e48cf/dadfef8e90664c25aaaef875c2ec4189 [2022-01-30 23:21:12,218 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-01-30 23:21:12,219 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-01-30 23:21:12,220 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-01-30 23:21:12,220 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-01-30 23:21:12,222 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-01-30 23:21:12,222 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.01 11:21:12" (1/1) ... [2022-01-30 23:21:12,223 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@8159c1d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 11:21:12, skipping insertion in model container [2022-01-30 23:21:12,223 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.01 11:21:12" (1/1) ... [2022-01-30 23:21:12,227 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-01-30 23:21:12,236 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-01-30 23:21:12,370 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/xor1.i[1285,1298] [2022-01-30 23:21:12,372 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-30 23:21:12,376 INFO L203 MainTranslator]: Completed pre-run [2022-01-30 23:21:12,390 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/xor1.i[1285,1298] [2022-01-30 23:21:12,390 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-30 23:21:12,399 INFO L208 MainTranslator]: Completed translation [2022-01-30 23:21:12,399 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 11:21:12 WrapperNode [2022-01-30 23:21:12,400 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-01-30 23:21:12,400 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-01-30 23:21:12,400 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-01-30 23:21:12,400 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-01-30 23:21:12,408 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 11:21:12" (1/1) ... [2022-01-30 23:21:12,408 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 11:21:12" (1/1) ... [2022-01-30 23:21:12,413 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 11:21:12" (1/1) ... [2022-01-30 23:21:12,413 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 11:21:12" (1/1) ... [2022-01-30 23:21:12,418 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 11:21:12" (1/1) ... [2022-01-30 23:21:12,421 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 11:21:12" (1/1) ... [2022-01-30 23:21:12,427 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 11:21:12" (1/1) ... [2022-01-30 23:21:12,429 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-01-30 23:21:12,429 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-01-30 23:21:12,429 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-01-30 23:21:12,429 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-01-30 23:21:12,430 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 11:21:12" (1/1) ... [2022-01-30 23:21:12,435 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-30 23:21:12,443 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 23:21:12,453 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) [2022-01-30 23:21:12,478 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 [2022-01-30 23:21:12,499 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-01-30 23:21:12,500 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-01-30 23:21:12,501 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-01-30 23:21:12,502 INFO L138 BoogieDeclarations]: Found implementation of procedure xor [2022-01-30 23:21:12,502 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-01-30 23:21:12,503 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-01-30 23:21:12,503 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-01-30 23:21:12,503 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-01-30 23:21:12,503 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-01-30 23:21:12,503 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-01-30 23:21:12,503 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-01-30 23:21:12,503 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-01-30 23:21:12,503 INFO L130 BoogieDeclarations]: Found specification of procedure xor [2022-01-30 23:21:12,504 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-01-30 23:21:12,504 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-01-30 23:21:12,504 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-01-30 23:21:12,504 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-01-30 23:21:12,504 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-01-30 23:21:12,504 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-01-30 23:21:12,504 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-01-30 23:21:12,504 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-01-30 23:21:12,579 INFO L234 CfgBuilder]: Building ICFG [2022-01-30 23:21:12,580 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-01-30 23:21:12,706 INFO L275 CfgBuilder]: Performing block encoding [2022-01-30 23:21:12,710 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-01-30 23:21:12,711 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-01-30 23:21:12,712 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.01 11:21:12 BoogieIcfgContainer [2022-01-30 23:21:12,712 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-01-30 23:21:12,713 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-01-30 23:21:12,713 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-01-30 23:21:12,716 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-01-30 23:21:12,716 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.01 11:21:12" (1/3) ... [2022-01-30 23:21:12,716 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31b444e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.01 11:21:12, skipping insertion in model container [2022-01-30 23:21:12,717 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 11:21:12" (2/3) ... [2022-01-30 23:21:12,717 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31b444e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.01 11:21:12, skipping insertion in model container [2022-01-30 23:21:12,717 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.01 11:21:12" (3/3) ... [2022-01-30 23:21:12,718 INFO L111 eAbstractionObserver]: Analyzing ICFG xor1.i [2022-01-30 23:21:12,721 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-01-30 23:21:12,722 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-01-30 23:21:12,751 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-01-30 23:21:12,756 INFO L339 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=true, 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, mLoopAccelerationTechnique=FAST_UPR [2022-01-30 23:21:12,756 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-01-30 23:21:12,780 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 21 states have (on average 1.380952380952381) internal successors, (29), 22 states have internal predecessors, (29), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-01-30 23:21:12,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-01-30 23:21:12,784 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 23:21:12,785 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 23:21:12,785 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 23:21:12,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 23:21:12,789 INFO L85 PathProgramCache]: Analyzing trace with hash -1373981706, now seen corresponding path program 1 times [2022-01-30 23:21:12,808 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 23:21:12,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683967680] [2022-01-30 23:21:12,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:12,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 23:21:12,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:12,988 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 23:21:13,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:13,025 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-01-30 23:21:13,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:13,038 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2022-01-30 23:21:13,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:13,052 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-01-30 23:21:13,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:13,069 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-01-30 23:21:13,070 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 23:21:13,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683967680] [2022-01-30 23:21:13,071 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683967680] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-30 23:21:13,071 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-30 23:21:13,071 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-01-30 23:21:13,072 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608631769] [2022-01-30 23:21:13,073 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-30 23:21:13,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-01-30 23:21:13,076 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 23:21:13,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-01-30 23:21:13,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-30 23:21:13,096 INFO L87 Difference]: Start difference. First operand has 31 states, 21 states have (on average 1.380952380952381) internal successors, (29), 22 states have internal predecessors, (29), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-01-30 23:21:13,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 23:21:13,141 INFO L93 Difference]: Finished difference Result 54 states and 71 transitions. [2022-01-30 23:21:13,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-01-30 23:21:13,146 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2022-01-30 23:21:13,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 23:21:13,152 INFO L225 Difference]: With dead ends: 54 [2022-01-30 23:21:13,152 INFO L226 Difference]: Without dead ends: 26 [2022-01-30 23:21:13,154 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-30 23:21:13,161 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 22 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-30 23:21:13,162 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 35 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-30 23:21:13,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-01-30 23:21:13,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-01-30 23:21:13,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-01-30 23:21:13,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2022-01-30 23:21:13,205 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 32 [2022-01-30 23:21:13,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 23:21:13,205 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2022-01-30 23:21:13,206 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-01-30 23:21:13,206 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2022-01-30 23:21:13,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-01-30 23:21:13,208 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 23:21:13,209 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 23:21:13,209 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-01-30 23:21:13,210 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 23:21:13,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 23:21:13,212 INFO L85 PathProgramCache]: Analyzing trace with hash -508796304, now seen corresponding path program 1 times [2022-01-30 23:21:13,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 23:21:13,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674125721] [2022-01-30 23:21:13,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:13,213 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 23:21:13,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:13,283 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 23:21:13,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:13,300 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-01-30 23:21:13,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:13,313 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2022-01-30 23:21:13,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:13,339 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-01-30 23:21:13,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:13,346 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-01-30 23:21:13,346 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 23:21:13,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674125721] [2022-01-30 23:21:13,347 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1674125721] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 23:21:13,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1774103369] [2022-01-30 23:21:13,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:13,347 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:13,347 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 23:21:13,349 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 23:21:13,363 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-01-30 23:21:13,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:13,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 2 conjunts are in the unsatisfiable core [2022-01-30 23:21:13,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-30 23:21:13,468 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-01-30 23:21:13,469 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-01-30 23:21:13,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1774103369] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-30 23:21:13,469 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-01-30 23:21:13,469 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-01-30 23:21:13,470 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678518990] [2022-01-30 23:21:13,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-30 23:21:13,471 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-01-30 23:21:13,471 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 23:21:13,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-01-30 23:21:13,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-01-30 23:21:13,472 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-01-30 23:21:13,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 23:21:13,480 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2022-01-30 23:21:13,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-01-30 23:21:13,481 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2022-01-30 23:21:13,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 23:21:13,481 INFO L225 Difference]: With dead ends: 46 [2022-01-30 23:21:13,481 INFO L226 Difference]: Without dead ends: 28 [2022-01-30 23:21:13,482 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-01-30 23:21:13,483 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 1 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-30 23:21:13,483 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 54 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-30 23:21:13,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-01-30 23:21:13,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2022-01-30 23:21:13,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-01-30 23:21:13,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2022-01-30 23:21:13,491 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 32 [2022-01-30 23:21:13,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 23:21:13,492 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2022-01-30 23:21:13,492 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-01-30 23:21:13,492 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2022-01-30 23:21:13,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-01-30 23:21:13,493 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 23:21:13,493 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 23:21:13,510 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-01-30 23:21:13,710 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:13,710 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 23:21:13,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 23:21:13,711 INFO L85 PathProgramCache]: Analyzing trace with hash 2103922642, now seen corresponding path program 1 times [2022-01-30 23:21:13,711 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 23:21:13,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831921971] [2022-01-30 23:21:13,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:13,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 23:21:13,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:13,772 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 23:21:13,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:13,786 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-01-30 23:21:13,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:13,800 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-01-30 23:21:13,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:13,811 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2022-01-30 23:21:13,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:13,823 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-01-30 23:21:13,823 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 23:21:13,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831921971] [2022-01-30 23:21:13,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1831921971] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 23:21:13,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510049859] [2022-01-30 23:21:13,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:13,824 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:13,824 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 23:21:13,828 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 23:21:13,829 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-01-30 23:21:13,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:13,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 2 conjunts are in the unsatisfiable core [2022-01-30 23:21:13,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-30 23:21:13,950 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-01-30 23:21:13,950 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-01-30 23:21:13,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510049859] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-30 23:21:13,950 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-01-30 23:21:13,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2022-01-30 23:21:13,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993279892] [2022-01-30 23:21:13,951 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-30 23:21:13,951 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-01-30 23:21:13,951 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 23:21:13,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-01-30 23:21:13,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-01-30 23:21:13,952 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-01-30 23:21:13,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 23:21:13,963 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2022-01-30 23:21:13,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-01-30 23:21:13,965 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 34 [2022-01-30 23:21:13,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 23:21:13,965 INFO L225 Difference]: With dead ends: 46 [2022-01-30 23:21:13,965 INFO L226 Difference]: Without dead ends: 29 [2022-01-30 23:21:13,966 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-01-30 23:21:13,966 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 1 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-30 23:21:13,967 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 54 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-30 23:21:13,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-01-30 23:21:13,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2022-01-30 23:21:13,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-01-30 23:21:13,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2022-01-30 23:21:13,983 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 34 [2022-01-30 23:21:13,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 23:21:13,984 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2022-01-30 23:21:13,984 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-01-30 23:21:13,984 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2022-01-30 23:21:13,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-01-30 23:21:13,985 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 23:21:13,985 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 23:21:14,022 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-01-30 23:21:14,215 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-01-30 23:21:14,216 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 23:21:14,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 23:21:14,216 INFO L85 PathProgramCache]: Analyzing trace with hash -587035376, now seen corresponding path program 1 times [2022-01-30 23:21:14,216 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 23:21:14,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [869457547] [2022-01-30 23:21:14,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:14,217 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 23:21:14,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:14,244 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 23:21:14,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:14,248 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-01-30 23:21:14,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:14,254 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2022-01-30 23:21:14,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:14,260 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2022-01-30 23:21:14,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:14,265 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-01-30 23:21:14,265 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 23:21:14,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [869457547] [2022-01-30 23:21:14,265 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [869457547] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 23:21:14,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603824599] [2022-01-30 23:21:14,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:14,266 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:14,266 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 23:21:14,267 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 23:21:14,269 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-01-30 23:21:14,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:14,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 2 conjunts are in the unsatisfiable core [2022-01-30 23:21:14,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-30 23:21:14,395 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-01-30 23:21:14,395 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-01-30 23:21:14,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [603824599] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-30 23:21:14,398 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-01-30 23:21:14,400 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-01-30 23:21:14,400 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425464361] [2022-01-30 23:21:14,400 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-30 23:21:14,403 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-01-30 23:21:14,404 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 23:21:14,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-01-30 23:21:14,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-01-30 23:21:14,404 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-01-30 23:21:14,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 23:21:14,421 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2022-01-30 23:21:14,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-01-30 23:21:14,424 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 40 [2022-01-30 23:21:14,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 23:21:14,425 INFO L225 Difference]: With dead ends: 43 [2022-01-30 23:21:14,425 INFO L226 Difference]: Without dead ends: 30 [2022-01-30 23:21:14,425 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-01-30 23:21:14,426 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 1 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-30 23:21:14,426 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 54 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-30 23:21:14,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-01-30 23:21:14,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2022-01-30 23:21:14,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 states have internal predecessors, (24), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-01-30 23:21:14,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2022-01-30 23:21:14,430 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 40 [2022-01-30 23:21:14,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 23:21:14,431 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2022-01-30 23:21:14,431 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-01-30 23:21:14,432 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2022-01-30 23:21:14,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-01-30 23:21:14,432 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 23:21:14,432 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 23:21:14,456 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-01-30 23:21:14,654 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:14,654 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 23:21:14,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 23:21:14,655 INFO L85 PathProgramCache]: Analyzing trace with hash 2137181582, now seen corresponding path program 1 times [2022-01-30 23:21:14,655 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 23:21:14,655 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476158398] [2022-01-30 23:21:14,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:14,655 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 23:21:14,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:14,703 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 23:21:14,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:14,711 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-01-30 23:21:14,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:14,718 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2022-01-30 23:21:14,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:14,726 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2022-01-30 23:21:14,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:14,736 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-01-30 23:21:14,736 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 23:21:14,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476158398] [2022-01-30 23:21:14,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1476158398] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 23:21:14,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [92095309] [2022-01-30 23:21:14,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:14,737 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:14,737 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 23:21:14,748 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 23:21:14,773 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-01-30 23:21:14,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:14,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 3 conjunts are in the unsatisfiable core [2022-01-30 23:21:14,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-30 23:21:14,886 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-01-30 23:21:14,886 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-30 23:21:14,966 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-01-30 23:21:14,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [92095309] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-30 23:21:14,966 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-30 23:21:14,966 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2022-01-30 23:21:14,967 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397509629] [2022-01-30 23:21:14,967 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-30 23:21:14,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-01-30 23:21:14,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 23:21:14,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-01-30 23:21:14,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2022-01-30 23:21:14,970 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 8 states, 8 states have (on average 4.375) internal successors, (35), 7 states have internal predecessors, (35), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-01-30 23:21:15,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 23:21:15,059 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2022-01-30 23:21:15,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-01-30 23:21:15,059 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.375) internal successors, (35), 7 states have internal predecessors, (35), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 42 [2022-01-30 23:21:15,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 23:21:15,063 INFO L225 Difference]: With dead ends: 55 [2022-01-30 23:21:15,063 INFO L226 Difference]: Without dead ends: 35 [2022-01-30 23:21:15,065 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2022-01-30 23:21:15,067 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 26 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-30 23:21:15,069 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 42 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-30 23:21:15,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-01-30 23:21:15,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-01-30 23:21:15,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 states have internal predecessors, (30), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-01-30 23:21:15,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2022-01-30 23:21:15,084 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 42 [2022-01-30 23:21:15,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 23:21:15,085 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2022-01-30 23:21:15,085 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.375) internal successors, (35), 7 states have internal predecessors, (35), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-01-30 23:21:15,085 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2022-01-30 23:21:15,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-01-30 23:21:15,087 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 23:21:15,088 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 23:21:15,106 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-01-30 23:21:15,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:15,301 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 23:21:15,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 23:21:15,302 INFO L85 PathProgramCache]: Analyzing trace with hash 2032446644, now seen corresponding path program 2 times [2022-01-30 23:21:15,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 23:21:15,302 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161335399] [2022-01-30 23:21:15,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:15,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 23:21:15,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:15,328 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 23:21:15,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:15,345 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2022-01-30 23:21:15,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:15,360 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2022-01-30 23:21:15,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:15,365 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2022-01-30 23:21:15,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:15,390 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 9 proven. 11 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-01-30 23:21:15,390 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 23:21:15,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161335399] [2022-01-30 23:21:15,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [161335399] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 23:21:15,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1062312768] [2022-01-30 23:21:15,390 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-01-30 23:21:15,390 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:15,391 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 23:21:15,393 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 23:21:15,394 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-01-30 23:21:15,454 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-01-30 23:21:15,454 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-30 23:21:15,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 6 conjunts are in the unsatisfiable core [2022-01-30 23:21:15,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-30 23:21:15,555 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-01-30 23:21:15,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-30 23:21:15,656 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-01-30 23:21:15,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1062312768] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-30 23:21:15,657 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-30 23:21:15,657 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 15 [2022-01-30 23:21:15,657 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399388278] [2022-01-30 23:21:15,657 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-30 23:21:15,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-01-30 23:21:15,658 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 23:21:15,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-01-30 23:21:15,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=137, Unknown=0, NotChecked=0, Total=210 [2022-01-30 23:21:15,658 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 15 states, 15 states have (on average 3.466666666666667) internal successors, (52), 14 states have internal predecessors, (52), 2 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-01-30 23:21:15,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 23:21:15,834 INFO L93 Difference]: Finished difference Result 70 states and 87 transitions. [2022-01-30 23:21:15,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-01-30 23:21:15,835 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.466666666666667) internal successors, (52), 14 states have internal predecessors, (52), 2 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 48 [2022-01-30 23:21:15,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 23:21:15,838 INFO L225 Difference]: With dead ends: 70 [2022-01-30 23:21:15,838 INFO L226 Difference]: Without dead ends: 50 [2022-01-30 23:21:15,839 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=213, Invalid=489, Unknown=0, NotChecked=0, Total=702 [2022-01-30 23:21:15,840 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 42 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-30 23:21:15,841 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 40 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-30 23:21:15,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-01-30 23:21:15,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2022-01-30 23:21:15,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 41 states have internal predecessors, (44), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-01-30 23:21:15,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2022-01-30 23:21:15,852 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 48 [2022-01-30 23:21:15,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 23:21:15,852 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2022-01-30 23:21:15,853 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.466666666666667) internal successors, (52), 14 states have internal predecessors, (52), 2 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-01-30 23:21:15,853 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2022-01-30 23:21:15,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-01-30 23:21:15,857 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 23:21:15,857 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 6, 6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 23:21:15,877 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-01-30 23:21:16,057 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:16,058 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 23:21:16,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 23:21:16,058 INFO L85 PathProgramCache]: Analyzing trace with hash 2143850302, now seen corresponding path program 3 times [2022-01-30 23:21:16,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 23:21:16,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658802234] [2022-01-30 23:21:16,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:16,059 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 23:21:16,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:16,143 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 23:21:16,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:16,147 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2022-01-30 23:21:16,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:16,153 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2022-01-30 23:21:16,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:16,159 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2022-01-30 23:21:16,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:16,168 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2022-01-30 23:21:16,168 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 23:21:16,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658802234] [2022-01-30 23:21:16,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1658802234] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 23:21:16,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595453024] [2022-01-30 23:21:16,168 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-01-30 23:21:16,168 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:16,168 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 23:21:16,180 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 23:21:16,181 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-01-30 23:21:16,243 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-01-30 23:21:16,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-30 23:21:16,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 3 conjunts are in the unsatisfiable core [2022-01-30 23:21:16,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-30 23:21:16,323 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 34 proven. 1 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2022-01-30 23:21:16,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-30 23:21:16,398 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2022-01-30 23:21:16,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1595453024] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-30 23:21:16,399 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-30 23:21:16,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2022-01-30 23:21:16,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524197509] [2022-01-30 23:21:16,399 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-30 23:21:16,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-01-30 23:21:16,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 23:21:16,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-01-30 23:21:16,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2022-01-30 23:21:16,401 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 8 states, 8 states have (on average 4.375) internal successors, (35), 7 states have internal predecessors, (35), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-01-30 23:21:16,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 23:21:16,490 INFO L93 Difference]: Finished difference Result 70 states and 77 transitions. [2022-01-30 23:21:16,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-01-30 23:21:16,493 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.375) internal successors, (35), 7 states have internal predecessors, (35), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 66 [2022-01-30 23:21:16,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 23:21:16,494 INFO L225 Difference]: With dead ends: 70 [2022-01-30 23:21:16,494 INFO L226 Difference]: Without dead ends: 55 [2022-01-30 23:21:16,494 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2022-01-30 23:21:16,495 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 26 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-30 23:21:16,495 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 47 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-30 23:21:16,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-01-30 23:21:16,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-01-30 23:21:16,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 47 states have (on average 1.0638297872340425) internal successors, (50), 47 states have internal predecessors, (50), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-01-30 23:21:16,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2022-01-30 23:21:16,499 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 66 [2022-01-30 23:21:16,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 23:21:16,499 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2022-01-30 23:21:16,499 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.375) internal successors, (35), 7 states have internal predecessors, (35), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-01-30 23:21:16,499 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2022-01-30 23:21:16,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-01-30 23:21:16,500 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 23:21:16,500 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 6, 6, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 23:21:16,535 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-01-30 23:21:16,711 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:16,712 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 23:21:16,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 23:21:16,712 INFO L85 PathProgramCache]: Analyzing trace with hash -1006772296, now seen corresponding path program 4 times [2022-01-30 23:21:16,712 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 23:21:16,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322274070] [2022-01-30 23:21:16,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:16,712 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 23:21:16,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:16,749 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 23:21:16,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:16,752 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2022-01-30 23:21:16,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:16,766 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2022-01-30 23:21:16,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:16,770 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2022-01-30 23:21:16,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:16,773 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 143 trivial. 0 not checked. [2022-01-30 23:21:16,773 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 23:21:16,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322274070] [2022-01-30 23:21:16,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [322274070] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 23:21:16,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [618270584] [2022-01-30 23:21:16,773 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-01-30 23:21:16,774 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:16,774 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 23:21:16,775 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 23:21:16,804 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-01-30 23:21:16,874 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-01-30 23:21:16,874 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-30 23:21:16,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 4 conjunts are in the unsatisfiable core [2022-01-30 23:21:16,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-30 23:21:16,952 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 32 proven. 4 refuted. 0 times theorem prover too weak. 143 trivial. 0 not checked. [2022-01-30 23:21:16,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-30 23:21:17,024 INFO L134 CoverageAnalysis]: Checked inductivity of 179 backedges. 32 proven. 4 refuted. 0 times theorem prover too weak. 143 trivial. 0 not checked. [2022-01-30 23:21:17,025 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [618270584] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-30 23:21:17,025 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-30 23:21:17,025 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 9 [2022-01-30 23:21:17,025 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718056527] [2022-01-30 23:21:17,025 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-30 23:21:17,025 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-01-30 23:21:17,026 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 23:21:17,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-01-30 23:21:17,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2022-01-30 23:21:17,027 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand has 9 states, 9 states have (on average 4.666666666666667) internal successors, (42), 8 states have internal predecessors, (42), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-01-30 23:21:17,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 23:21:17,103 INFO L93 Difference]: Finished difference Result 90 states and 103 transitions. [2022-01-30 23:21:17,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-01-30 23:21:17,103 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.666666666666667) internal successors, (42), 8 states have internal predecessors, (42), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 72 [2022-01-30 23:21:17,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 23:21:17,107 INFO L225 Difference]: With dead ends: 90 [2022-01-30 23:21:17,107 INFO L226 Difference]: Without dead ends: 63 [2022-01-30 23:21:17,109 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=84, Invalid=126, Unknown=0, NotChecked=0, Total=210 [2022-01-30 23:21:17,109 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 30 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-30 23:21:17,110 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 42 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-30 23:21:17,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-01-30 23:21:17,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-01-30 23:21:17,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 55 states have (on average 1.0545454545454545) internal successors, (58), 55 states have internal predecessors, (58), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-01-30 23:21:17,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 67 transitions. [2022-01-30 23:21:17,125 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 67 transitions. Word has length 72 [2022-01-30 23:21:17,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 23:21:17,125 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 67 transitions. [2022-01-30 23:21:17,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.666666666666667) internal successors, (42), 8 states have internal predecessors, (42), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-01-30 23:21:17,125 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 67 transitions. [2022-01-30 23:21:17,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-01-30 23:21:17,126 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 23:21:17,126 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 10, 10, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 23:21:17,155 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-01-30 23:21:17,358 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:17,358 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 23:21:17,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 23:21:17,359 INFO L85 PathProgramCache]: Analyzing trace with hash -1373533264, now seen corresponding path program 5 times [2022-01-30 23:21:17,359 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 23:21:17,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1606135935] [2022-01-30 23:21:17,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:17,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 23:21:17,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:17,484 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 23:21:17,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:17,488 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2022-01-30 23:21:17,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:17,500 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2022-01-30 23:21:17,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:17,512 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 75 [2022-01-30 23:21:17,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:17,519 INFO L134 CoverageAnalysis]: Checked inductivity of 491 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 391 trivial. 0 not checked. [2022-01-30 23:21:17,520 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 23:21:17,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1606135935] [2022-01-30 23:21:17,520 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1606135935] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 23:21:17,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [601135615] [2022-01-30 23:21:17,520 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-01-30 23:21:17,520 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:17,520 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 23:21:17,540 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 23:21:17,541 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-01-30 23:21:17,885 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2022-01-30 23:21:17,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-30 23:21:17,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 8 conjunts are in the unsatisfiable core [2022-01-30 23:21:17,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-30 23:21:18,089 INFO L134 CoverageAnalysis]: Checked inductivity of 491 backedges. 172 proven. 36 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2022-01-30 23:21:18,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-30 23:21:18,305 INFO L134 CoverageAnalysis]: Checked inductivity of 491 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 279 trivial. 0 not checked. [2022-01-30 23:21:18,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [601135615] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-30 23:21:18,305 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-30 23:21:18,305 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9, 9] total 28 [2022-01-30 23:21:18,306 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794872009] [2022-01-30 23:21:18,306 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-30 23:21:18,306 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-01-30 23:21:18,306 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 23:21:18,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-01-30 23:21:18,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=557, Unknown=0, NotChecked=0, Total=756 [2022-01-30 23:21:18,307 INFO L87 Difference]: Start difference. First operand 63 states and 67 transitions. Second operand has 28 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 27 states have internal predecessors, (78), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-01-30 23:21:18,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 23:21:18,681 INFO L93 Difference]: Finished difference Result 118 states and 137 transitions. [2022-01-30 23:21:18,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-01-30 23:21:18,681 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 27 states have internal predecessors, (78), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 96 [2022-01-30 23:21:18,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 23:21:18,682 INFO L225 Difference]: With dead ends: 118 [2022-01-30 23:21:18,682 INFO L226 Difference]: Without dead ends: 82 [2022-01-30 23:21:18,683 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=591, Invalid=2165, Unknown=0, NotChecked=0, Total=2756 [2022-01-30 23:21:18,684 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 68 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-30 23:21:18,684 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 50 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-30 23:21:18,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-01-30 23:21:18,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2022-01-30 23:21:18,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 73 states have internal predecessors, (76), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-01-30 23:21:18,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 85 transitions. [2022-01-30 23:21:18,688 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 85 transitions. Word has length 96 [2022-01-30 23:21:18,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 23:21:18,689 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 85 transitions. [2022-01-30 23:21:18,689 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 27 states have internal predecessors, (78), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-01-30 23:21:18,689 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 85 transitions. [2022-01-30 23:21:18,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2022-01-30 23:21:18,699 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 23:21:18,699 INFO L514 BasicCegarLoop]: trace histogram [42, 42, 11, 11, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 23:21:18,718 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-01-30 23:21:18,900 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-01-30 23:21:18,900 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 23:21:18,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 23:21:18,901 INFO L85 PathProgramCache]: Analyzing trace with hash -996180734, now seen corresponding path program 6 times [2022-01-30 23:21:18,901 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 23:21:18,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [87686277] [2022-01-30 23:21:18,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:18,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 23:21:18,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:19,068 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 23:21:19,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:19,072 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2022-01-30 23:21:19,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:19,078 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2022-01-30 23:21:19,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:19,083 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 109 [2022-01-30 23:21:19,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:19,092 INFO L134 CoverageAnalysis]: Checked inductivity of 2000 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 1879 trivial. 0 not checked. [2022-01-30 23:21:19,093 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 23:21:19,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [87686277] [2022-01-30 23:21:19,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [87686277] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 23:21:19,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [259676229] [2022-01-30 23:21:19,093 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-01-30 23:21:19,093 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:19,093 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 23:21:19,094 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 23:21:19,095 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-01-30 23:21:19,348 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2022-01-30 23:21:19,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-30 23:21:19,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 6 conjunts are in the unsatisfiable core [2022-01-30 23:21:19,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-30 23:21:19,549 INFO L134 CoverageAnalysis]: Checked inductivity of 2000 backedges. 850 proven. 16 refuted. 0 times theorem prover too weak. 1134 trivial. 0 not checked. [2022-01-30 23:21:19,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-30 23:21:19,711 INFO L134 CoverageAnalysis]: Checked inductivity of 2000 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2022-01-30 23:21:19,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [259676229] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-30 23:21:19,712 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-30 23:21:19,712 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 7, 7] total 25 [2022-01-30 23:21:19,712 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472432784] [2022-01-30 23:21:19,712 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-30 23:21:19,713 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-01-30 23:21:19,713 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 23:21:19,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-01-30 23:21:19,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2022-01-30 23:21:19,713 INFO L87 Difference]: Start difference. First operand 81 states and 85 transitions. Second operand has 25 states, 25 states have (on average 2.92) internal successors, (73), 24 states have internal predecessors, (73), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-01-30 23:21:20,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 23:21:20,035 INFO L93 Difference]: Finished difference Result 148 states and 162 transitions. [2022-01-30 23:21:20,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-01-30 23:21:20,036 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.92) internal successors, (73), 24 states have internal predecessors, (73), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 146 [2022-01-30 23:21:20,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 23:21:20,037 INFO L225 Difference]: With dead ends: 148 [2022-01-30 23:21:20,037 INFO L226 Difference]: Without dead ends: 96 [2022-01-30 23:21:20,038 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 290 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=468, Invalid=1694, Unknown=0, NotChecked=0, Total=2162 [2022-01-30 23:21:20,038 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 67 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-30 23:21:20,039 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 60 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-30 23:21:20,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-01-30 23:21:20,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2022-01-30 23:21:20,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 87 states have (on average 1.0344827586206897) internal successors, (90), 87 states have internal predecessors, (90), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-01-30 23:21:20,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 99 transitions. [2022-01-30 23:21:20,043 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 99 transitions. Word has length 146 [2022-01-30 23:21:20,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 23:21:20,043 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 99 transitions. [2022-01-30 23:21:20,043 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.92) internal successors, (73), 24 states have internal predecessors, (73), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-01-30 23:21:20,043 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 99 transitions. [2022-01-30 23:21:20,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2022-01-30 23:21:20,046 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 23:21:20,046 INFO L514 BasicCegarLoop]: trace histogram [42, 42, 12, 12, 10, 10, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 23:21:20,067 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-01-30 23:21:20,264 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-01-30 23:21:20,265 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 23:21:20,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 23:21:20,265 INFO L85 PathProgramCache]: Analyzing trace with hash -194604456, now seen corresponding path program 7 times [2022-01-30 23:21:20,265 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 23:21:20,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215943532] [2022-01-30 23:21:20,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:20,265 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 23:21:20,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:20,395 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 23:21:20,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:20,399 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2022-01-30 23:21:20,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:20,406 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 66 [2022-01-30 23:21:20,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:20,412 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 123 [2022-01-30 23:21:20,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:20,419 INFO L134 CoverageAnalysis]: Checked inductivity of 2107 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 1963 trivial. 0 not checked. [2022-01-30 23:21:20,419 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 23:21:20,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215943532] [2022-01-30 23:21:20,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [215943532] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 23:21:20,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [658059066] [2022-01-30 23:21:20,420 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-01-30 23:21:20,420 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:20,420 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 23:21:20,421 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 23:21:20,457 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-01-30 23:21:20,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:20,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 463 conjuncts, 14 conjunts are in the unsatisfiable core [2022-01-30 23:21:20,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-30 23:21:20,706 INFO L134 CoverageAnalysis]: Checked inductivity of 2107 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 1963 trivial. 0 not checked. [2022-01-30 23:21:20,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-30 23:21:21,040 INFO L134 CoverageAnalysis]: Checked inductivity of 2107 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 1963 trivial. 0 not checked. [2022-01-30 23:21:21,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [658059066] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-30 23:21:21,040 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-30 23:21:21,040 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 30 [2022-01-30 23:21:21,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792953751] [2022-01-30 23:21:21,041 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-30 23:21:21,041 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-01-30 23:21:21,041 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 23:21:21,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-01-30 23:21:21,042 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2022-01-30 23:21:21,043 INFO L87 Difference]: Start difference. First operand 95 states and 99 transitions. Second operand has 30 states, 30 states have (on average 2.6333333333333333) internal successors, (79), 29 states have internal predecessors, (79), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-01-30 23:21:21,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 23:21:21,406 INFO L93 Difference]: Finished difference Result 187 states and 208 transitions. [2022-01-30 23:21:21,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-01-30 23:21:21,406 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.6333333333333333) internal successors, (79), 29 states have internal predecessors, (79), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 160 [2022-01-30 23:21:21,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 23:21:21,407 INFO L225 Difference]: With dead ends: 187 [2022-01-30 23:21:21,407 INFO L226 Difference]: Without dead ends: 123 [2022-01-30 23:21:21,408 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 314 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 475 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1163, Invalid=1917, Unknown=0, NotChecked=0, Total=3080 [2022-01-30 23:21:21,408 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 83 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-30 23:21:21,408 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 42 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-30 23:21:21,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-01-30 23:21:21,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2022-01-30 23:21:21,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 115 states have (on average 1.0260869565217392) internal successors, (118), 115 states have internal predecessors, (118), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-01-30 23:21:21,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 127 transitions. [2022-01-30 23:21:21,414 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 127 transitions. Word has length 160 [2022-01-30 23:21:21,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 23:21:21,414 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 127 transitions. [2022-01-30 23:21:21,414 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.6333333333333333) internal successors, (79), 29 states have internal predecessors, (79), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-01-30 23:21:21,414 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 127 transitions. [2022-01-30 23:21:21,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2022-01-30 23:21:21,415 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 23:21:21,415 INFO L514 BasicCegarLoop]: trace histogram [42, 42, 26, 26, 10, 10, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 23:21:21,435 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-01-30 23:21:21,629 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-01-30 23:21:21,629 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 23:21:21,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 23:21:21,630 INFO L85 PathProgramCache]: Analyzing trace with hash -1965936588, now seen corresponding path program 8 times [2022-01-30 23:21:21,630 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 23:21:21,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134124190] [2022-01-30 23:21:21,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:21,630 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 23:21:21,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:21,955 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 23:21:21,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:21,958 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2022-01-30 23:21:21,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:21,963 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 94 [2022-01-30 23:21:21,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:21,967 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 151 [2022-01-30 23:21:21,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:21,972 INFO L134 CoverageAnalysis]: Checked inductivity of 2639 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 1963 trivial. 0 not checked. [2022-01-30 23:21:21,973 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 23:21:21,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134124190] [2022-01-30 23:21:21,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134124190] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 23:21:21,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [291902831] [2022-01-30 23:21:21,973 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-01-30 23:21:21,973 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:21,973 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 23:21:21,974 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 23:21:22,015 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-01-30 23:21:22,119 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-01-30 23:21:22,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-30 23:21:22,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 589 conjuncts, 28 conjunts are in the unsatisfiable core [2022-01-30 23:21:22,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-30 23:21:22,340 INFO L134 CoverageAnalysis]: Checked inductivity of 2639 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 1963 trivial. 0 not checked. [2022-01-30 23:21:22,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-30 23:21:23,123 INFO L134 CoverageAnalysis]: Checked inductivity of 2639 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 1963 trivial. 0 not checked. [2022-01-30 23:21:23,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [291902831] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-30 23:21:23,123 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-30 23:21:23,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 58 [2022-01-30 23:21:23,123 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51765886] [2022-01-30 23:21:23,124 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-30 23:21:23,124 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-01-30 23:21:23,124 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 23:21:23,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-01-30 23:21:23,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2022-01-30 23:21:23,126 INFO L87 Difference]: Start difference. First operand 123 states and 127 transitions. Second operand has 58 states, 58 states have (on average 2.3275862068965516) internal successors, (135), 57 states have internal predecessors, (135), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-01-30 23:21:24,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 23:21:24,331 INFO L93 Difference]: Finished difference Result 243 states and 278 transitions. [2022-01-30 23:21:24,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-01-30 23:21:24,331 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.3275862068965516) internal successors, (135), 57 states have internal predecessors, (135), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 188 [2022-01-30 23:21:24,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 23:21:24,332 INFO L225 Difference]: With dead ends: 243 [2022-01-30 23:21:24,332 INFO L226 Difference]: Without dead ends: 179 [2022-01-30 23:21:24,335 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 356 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1938 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=4677, Invalid=7755, Unknown=0, NotChecked=0, Total=12432 [2022-01-30 23:21:24,336 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 126 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-30 23:21:24,336 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 52 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-30 23:21:24,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2022-01-30 23:21:24,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2022-01-30 23:21:24,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 171 states have (on average 1.0175438596491229) internal successors, (174), 171 states have internal predecessors, (174), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-01-30 23:21:24,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 183 transitions. [2022-01-30 23:21:24,341 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 183 transitions. Word has length 188 [2022-01-30 23:21:24,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 23:21:24,342 INFO L470 AbstractCegarLoop]: Abstraction has 179 states and 183 transitions. [2022-01-30 23:21:24,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.3275862068965516) internal successors, (135), 57 states have internal predecessors, (135), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-01-30 23:21:24,342 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 183 transitions. [2022-01-30 23:21:24,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2022-01-30 23:21:24,343 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 23:21:24,343 INFO L514 BasicCegarLoop]: trace histogram [54, 54, 42, 42, 10, 10, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 23:21:24,364 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-01-30 23:21:24,562 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-01-30 23:21:24,562 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 23:21:24,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 23:21:24,563 INFO L85 PathProgramCache]: Analyzing trace with hash -1867446804, now seen corresponding path program 9 times [2022-01-30 23:21:24,563 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 23:21:24,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1974693742] [2022-01-30 23:21:24,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:24,563 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 23:21:24,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:25,605 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 23:21:25,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:25,624 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 115 [2022-01-30 23:21:25,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:25,630 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 150 [2022-01-30 23:21:25,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:25,635 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 207 [2022-01-30 23:21:25,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:25,643 INFO L134 CoverageAnalysis]: Checked inductivity of 4879 backedges. 0 proven. 2916 refuted. 0 times theorem prover too weak. 1963 trivial. 0 not checked. [2022-01-30 23:21:25,643 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 23:21:25,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1974693742] [2022-01-30 23:21:25,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1974693742] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 23:21:25,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [117875610] [2022-01-30 23:21:25,643 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-01-30 23:21:25,643 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:25,644 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 23:21:25,645 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 23:21:25,646 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-01-30 23:21:26,322 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-01-30 23:21:26,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-30 23:21:26,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 12 conjunts are in the unsatisfiable core [2022-01-30 23:21:26,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-30 23:21:26,823 INFO L134 CoverageAnalysis]: Checked inductivity of 4879 backedges. 850 proven. 100 refuted. 0 times theorem prover too weak. 3929 trivial. 0 not checked. [2022-01-30 23:21:26,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-30 23:21:27,323 INFO L134 CoverageAnalysis]: Checked inductivity of 4879 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 4779 trivial. 0 not checked. [2022-01-30 23:21:27,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [117875610] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-30 23:21:27,324 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-30 23:21:27,324 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 13, 13] total 80 [2022-01-30 23:21:27,324 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455574121] [2022-01-30 23:21:27,324 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-30 23:21:27,325 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2022-01-30 23:21:27,325 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 23:21:27,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2022-01-30 23:21:27,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1873, Invalid=4447, Unknown=0, NotChecked=0, Total=6320 [2022-01-30 23:21:27,327 INFO L87 Difference]: Start difference. First operand 179 states and 183 transitions. Second operand has 80 states, 80 states have (on average 2.2875) internal successors, (183), 79 states have internal predecessors, (183), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-01-30 23:21:29,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 23:21:29,459 INFO L93 Difference]: Finished difference Result 270 states and 290 transitions. [2022-01-30 23:21:29,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2022-01-30 23:21:29,459 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 2.2875) internal successors, (183), 79 states have internal predecessors, (183), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 244 [2022-01-30 23:21:29,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 23:21:29,460 INFO L225 Difference]: With dead ends: 270 [2022-01-30 23:21:29,461 INFO L226 Difference]: Without dead ends: 206 [2022-01-30 23:21:29,465 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 629 GetRequests, 474 SyntacticMatches, 0 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4763 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=5613, Invalid=18879, Unknown=0, NotChecked=0, Total=24492 [2022-01-30 23:21:29,466 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 183 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-30 23:21:29,466 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 60 Invalid, 417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-30 23:21:29,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2022-01-30 23:21:29,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 205. [2022-01-30 23:21:29,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 197 states have (on average 1.015228426395939) internal successors, (200), 197 states have internal predecessors, (200), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-01-30 23:21:29,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 209 transitions. [2022-01-30 23:21:29,471 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 209 transitions. Word has length 244 [2022-01-30 23:21:29,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 23:21:29,472 INFO L470 AbstractCegarLoop]: Abstraction has 205 states and 209 transitions. [2022-01-30 23:21:29,472 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 2.2875) internal successors, (183), 79 states have internal predecessors, (183), 2 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-01-30 23:21:29,472 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 209 transitions. [2022-01-30 23:21:29,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2022-01-30 23:21:29,474 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 23:21:29,474 INFO L514 BasicCegarLoop]: trace histogram [55, 55, 42, 42, 22, 22, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 23:21:29,495 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-01-30 23:21:29,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-01-30 23:21:29,689 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 23:21:29,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 23:21:29,690 INFO L85 PathProgramCache]: Analyzing trace with hash 1660304182, now seen corresponding path program 10 times [2022-01-30 23:21:29,690 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 23:21:29,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836181731] [2022-01-30 23:21:29,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:29,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 23:21:29,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:30,797 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 23:21:30,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:30,801 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117 [2022-01-30 23:21:30,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:30,807 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 152 [2022-01-30 23:21:30,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:30,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 233 [2022-01-30 23:21:30,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:30,819 INFO L134 CoverageAnalysis]: Checked inductivity of 5372 backedges. 0 proven. 3025 refuted. 0 times theorem prover too weak. 2347 trivial. 0 not checked. [2022-01-30 23:21:30,820 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 23:21:30,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1836181731] [2022-01-30 23:21:30,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1836181731] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 23:21:30,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805070163] [2022-01-30 23:21:30,820 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-01-30 23:21:30,820 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:30,820 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 23:21:30,821 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 23:21:30,828 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-01-30 23:21:31,014 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-01-30 23:21:31,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-30 23:21:31,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 934 conjuncts, 16 conjunts are in the unsatisfiable core [2022-01-30 23:21:31,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-30 23:21:31,502 INFO L134 CoverageAnalysis]: Checked inductivity of 5372 backedges. 848 proven. 196 refuted. 0 times theorem prover too weak. 4328 trivial. 0 not checked. [2022-01-30 23:21:31,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-30 23:21:31,922 INFO L134 CoverageAnalysis]: Checked inductivity of 5372 backedges. 848 proven. 196 refuted. 0 times theorem prover too weak. 4328 trivial. 0 not checked. [2022-01-30 23:21:31,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [805070163] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-30 23:21:31,923 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-30 23:21:31,923 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 17, 17] total 89 [2022-01-30 23:21:31,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190553771] [2022-01-30 23:21:31,923 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-30 23:21:31,923 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2022-01-30 23:21:31,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 23:21:31,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2022-01-30 23:21:31,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2150, Invalid=5682, Unknown=0, NotChecked=0, Total=7832 [2022-01-30 23:21:31,927 INFO L87 Difference]: Start difference. First operand 205 states and 209 transitions. Second operand has 89 states, 89 states have (on average 2.269662921348315) internal successors, (202), 88 states have internal predecessors, (202), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-01-30 23:21:34,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 23:21:34,348 INFO L93 Difference]: Finished difference Result 328 states and 355 transitions. [2022-01-30 23:21:34,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2022-01-30 23:21:34,349 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 2.269662921348315) internal successors, (202), 88 states have internal predecessors, (202), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 270 [2022-01-30 23:21:34,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 23:21:34,350 INFO L225 Difference]: With dead ends: 328 [2022-01-30 23:21:34,350 INFO L226 Difference]: Without dead ends: 240 [2022-01-30 23:21:34,353 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 691 GetRequests, 518 SyntacticMatches, 0 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6235 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=6444, Invalid=24006, Unknown=0, NotChecked=0, Total=30450 [2022-01-30 23:21:34,353 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 205 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 576 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-30 23:21:34,354 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [208 Valid, 90 Invalid, 576 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-30 23:21:34,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2022-01-30 23:21:34,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 239. [2022-01-30 23:21:34,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 231 states have (on average 1.0129870129870129) internal successors, (234), 231 states have internal predecessors, (234), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-01-30 23:21:34,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 243 transitions. [2022-01-30 23:21:34,360 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 243 transitions. Word has length 270 [2022-01-30 23:21:34,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 23:21:34,361 INFO L470 AbstractCegarLoop]: Abstraction has 239 states and 243 transitions. [2022-01-30 23:21:34,361 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 2.269662921348315) internal successors, (202), 88 states have internal predecessors, (202), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-01-30 23:21:34,361 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 243 transitions. [2022-01-30 23:21:34,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 369 [2022-01-30 23:21:34,364 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 23:21:34,364 INFO L514 BasicCegarLoop]: trace histogram [90, 90, 56, 56, 22, 22, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 23:21:34,385 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-01-30 23:21:34,575 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-01-30 23:21:34,575 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 23:21:34,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 23:21:34,576 INFO L85 PathProgramCache]: Analyzing trace with hash -395346696, now seen corresponding path program 11 times [2022-01-30 23:21:34,576 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 23:21:34,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1865012410] [2022-01-30 23:21:34,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 23:21:34,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 23:21:34,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:35,416 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 23:21:35,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:35,432 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 119 [2022-01-30 23:21:35,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:35,442 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 186 [2022-01-30 23:21:35,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:35,450 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 299 [2022-01-30 23:21:35,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 23:21:35,461 INFO L134 CoverageAnalysis]: Checked inductivity of 11915 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 8779 trivial. 0 not checked. [2022-01-30 23:21:35,461 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 23:21:35,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1865012410] [2022-01-30 23:21:35,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1865012410] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 23:21:35,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [360865989] [2022-01-30 23:21:35,462 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-01-30 23:21:35,462 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 23:21:35,462 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 23:21:35,463 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 23:21:35,484 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process