/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/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 18:31:13,684 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 18:31:13,686 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 18:31:13,731 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 18:31:13,767 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 18:31:13,767 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 18:31:13,772 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 18:31:13,773 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 18:31:13,783 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 18:31:13,784 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 18:31:13,785 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 18:31:13,785 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 18:31:13,785 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 18:31:13,785 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 18:31:13,785 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 18:31:13,785 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 18:31:13,785 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 18:31:13,786 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 18:31:13,786 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 18:31:13,786 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 18:31:13,786 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 18:31:13,786 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 18:31:13,786 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 18:31:13,787 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:31:13,787 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 18:31:13,787 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 18:31:13,787 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 18:31:13,787 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 18:31:13,787 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 18:31:13,787 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 18:31:13,787 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 18:31:14,003 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 18:31:14,016 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 18:31:14,018 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 18:31:14,019 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 18:31:14,019 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 18:31:14,020 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c [2022-03-20 18:31:14,069 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c7b5e225a/a7bac1a18be14906b7a4628ea527551c/FLAGfc9e9ec4b [2022-03-20 18:31:14,473 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 18:31:14,473 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c [2022-03-20 18:31:14,492 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c7b5e225a/a7bac1a18be14906b7a4628ea527551c/FLAGfc9e9ec4b [2022-03-20 18:31:14,864 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c7b5e225a/a7bac1a18be14906b7a4628ea527551c [2022-03-20 18:31:14,865 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 18:31:14,866 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 18:31:14,869 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 18:31:14,869 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 18:31:14,872 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 18:31:14,872 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:31:14" (1/1) ... [2022-03-20 18:31:14,873 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ba987d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:31:14, skipping insertion in model container [2022-03-20 18:31:14,873 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:31:14" (1/1) ... [2022-03-20 18:31:14,878 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 18:31:14,907 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 18:31:15,158 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c[7920,7933] [2022-03-20 18:31:15,171 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:31:15,178 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 18:31:15,235 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/aiob_4.c.v+cfa-reducer.c[7920,7933] [2022-03-20 18:31:15,237 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:31:15,246 INFO L208 MainTranslator]: Completed translation [2022-03-20 18:31:15,246 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:31:15 WrapperNode [2022-03-20 18:31:15,246 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 18:31:15,251 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 18:31:15,252 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 18:31:15,252 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 18:31:15,259 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:31:15" (1/1) ... [2022-03-20 18:31:15,259 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:31:15" (1/1) ... [2022-03-20 18:31:15,270 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:31:15" (1/1) ... [2022-03-20 18:31:15,270 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:31:15" (1/1) ... [2022-03-20 18:31:15,286 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:31:15" (1/1) ... [2022-03-20 18:31:15,288 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:31:15" (1/1) ... [2022-03-20 18:31:15,290 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:31:15" (1/1) ... [2022-03-20 18:31:15,292 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 18:31:15,293 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 18:31:15,293 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 18:31:15,293 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 18:31:15,293 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:31:15" (1/1) ... [2022-03-20 18:31:15,298 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:31:15,310 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:31:15,320 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) [2022-03-20 18:31:15,336 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 [2022-03-20 18:31:15,361 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 18:31:15,361 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 18:31:15,361 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 18:31:15,362 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 18:31:15,362 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 18:31:15,362 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 18:31:15,362 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 18:31:15,362 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 18:31:15,362 INFO L130 BoogieDeclarations]: Found specification of procedure Id_MCDC_89 [2022-03-20 18:31:15,362 INFO L130 BoogieDeclarations]: Found specification of procedure fopen [2022-03-20 18:31:15,362 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 18:31:15,362 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 18:31:15,362 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-03-20 18:31:15,362 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 18:31:15,362 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-03-20 18:31:15,363 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 18:31:15,363 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 18:31:15,363 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 18:31:15,363 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 18:31:15,363 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 18:31:15,363 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-03-20 18:31:15,442 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 18:31:15,443 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 18:31:15,903 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 18:31:15,907 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 18:31:15,907 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2022-03-20 18:31:15,909 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:31:15 BoogieIcfgContainer [2022-03-20 18:31:15,909 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 18:31:15,911 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 18:31:15,911 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 18:31:15,915 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 18:31:15,915 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 06:31:14" (1/3) ... [2022-03-20 18:31:15,915 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ddab39 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:31:15, skipping insertion in model container [2022-03-20 18:31:15,915 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:31:15" (2/3) ... [2022-03-20 18:31:15,916 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ddab39 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:31:15, skipping insertion in model container [2022-03-20 18:31:15,916 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:31:15" (3/3) ... [2022-03-20 18:31:15,917 INFO L111 eAbstractionObserver]: Analyzing ICFG aiob_4.c.v+cfa-reducer.c [2022-03-20 18:31:15,921 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 18:31:15,921 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 18:31:15,957 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 18:31:15,963 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2022-03-20 18:31:15,963 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 18:31:15,972 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-20 18:31:15,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-03-20 18:31:15,981 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:31:15,981 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:31:15,982 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:31:15,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:31:15,986 INFO L85 PathProgramCache]: Analyzing trace with hash 2001183330, now seen corresponding path program 1 times [2022-03-20 18:31:15,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:15,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [944748332] [2022-03-20 18:31:15,998 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:31:15,998 INFO L85 PathProgramCache]: Analyzing trace with hash 2001183330, now seen corresponding path program 2 times [2022-03-20 18:31:16,000 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:31:16,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893981894] [2022-03-20 18:31:16,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:31:16,002 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:31:16,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:16,341 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:31:16,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:16,360 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:16,361 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:31:16,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893981894] [2022-03-20 18:31:16,361 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1893981894] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:31:16,362 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:31:16,362 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 18:31:16,364 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:31:16,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [944748332] [2022-03-20 18:31:16,364 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [944748332] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:31:16,365 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:31:16,365 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 18:31:16,365 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808966874] [2022-03-20 18:31:16,365 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:31:16,368 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 18:31:16,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:16,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 18:31:16,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 18:31:16,391 INFO L87 Difference]: Start difference. First operand has 19 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 14 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:16,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:31:16,479 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2022-03-20 18:31:16,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 18:31:16,481 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2022-03-20 18:31:16,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:31:16,486 INFO L225 Difference]: With dead ends: 46 [2022-03-20 18:31:16,486 INFO L226 Difference]: Without dead ends: 24 [2022-03-20 18:31:16,488 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-03-20 18:31:16,491 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 33 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:31:16,492 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 41 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:31:16,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-03-20 18:31:16,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 18. [2022-03-20 18:31:16,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:16,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2022-03-20 18:31:16,515 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2022-03-20 18:31:16,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:31:16,516 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2022-03-20 18:31:16,516 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:16,516 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2022-03-20 18:31:16,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-03-20 18:31:16,517 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:31:16,517 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:31:16,517 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 18:31:16,517 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:31:16,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:31:16,518 INFO L85 PathProgramCache]: Analyzing trace with hash 2000766256, now seen corresponding path program 1 times [2022-03-20 18:31:16,518 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:16,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1855436712] [2022-03-20 18:31:16,519 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:31:16,519 INFO L85 PathProgramCache]: Analyzing trace with hash 2000766256, now seen corresponding path program 2 times [2022-03-20 18:31:16,519 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:31:16,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879866965] [2022-03-20 18:31:16,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:31:16,520 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:31:16,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:16,611 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:31:16,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:16,622 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:16,622 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:31:16,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [879866965] [2022-03-20 18:31:16,625 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [879866965] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:31:16,625 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:31:16,625 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 18:31:16,626 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:31:16,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1855436712] [2022-03-20 18:31:16,626 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1855436712] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:31:16,627 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:31:16,627 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 18:31:16,627 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811566433] [2022-03-20 18:31:16,627 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:31:16,628 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 18:31:16,628 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:16,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 18:31:16,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 18:31:16,629 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:16,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:31:16,690 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2022-03-20 18:31:16,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 18:31:16,691 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2022-03-20 18:31:16,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:31:16,691 INFO L225 Difference]: With dead ends: 28 [2022-03-20 18:31:16,692 INFO L226 Difference]: Without dead ends: 26 [2022-03-20 18:31:16,692 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 18:31:16,693 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 11 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:31:16,693 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 41 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:31:16,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-20 18:31:16,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2022-03-20 18:31:16,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:16,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-03-20 18:31:16,698 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 13 [2022-03-20 18:31:16,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:31:16,698 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-03-20 18:31:16,698 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:16,699 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-03-20 18:31:16,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-20 18:31:16,699 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:31:16,699 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:31:16,699 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 18:31:16,700 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:31:16,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:31:16,700 INFO L85 PathProgramCache]: Analyzing trace with hash -1978265494, now seen corresponding path program 1 times [2022-03-20 18:31:16,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:16,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [889563015] [2022-03-20 18:31:16,701 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:31:16,701 INFO L85 PathProgramCache]: Analyzing trace with hash -1978265494, now seen corresponding path program 2 times [2022-03-20 18:31:16,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:31:16,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207636529] [2022-03-20 18:31:16,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:31:16,702 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:31:16,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:16,799 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:31:16,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:16,806 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:16,806 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:31:16,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207636529] [2022-03-20 18:31:16,806 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207636529] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:31:16,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [305053742] [2022-03-20 18:31:16,806 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:31:16,806 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:31:16,807 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:31:16,820 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) [2022-03-20 18:31:16,864 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 18:31:17,042 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:31:17,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:31:17,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 579 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 18:31:17,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:31:17,176 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:17,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:31:17,245 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:17,245 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [305053742] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:31:17,246 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:31:17,246 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 10 [2022-03-20 18:31:17,246 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:31:17,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [889563015] [2022-03-20 18:31:17,246 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [889563015] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:31:17,246 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:31:17,246 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:31:17,247 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586024601] [2022-03-20 18:31:17,247 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:31:17,247 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:31:17,247 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:17,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:31:17,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2022-03-20 18:31:17,248 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:17,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:31:17,347 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2022-03-20 18:31:17,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 18:31:17,348 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-03-20 18:31:17,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:31:17,348 INFO L225 Difference]: With dead ends: 40 [2022-03-20 18:31:17,348 INFO L226 Difference]: Without dead ends: 30 [2022-03-20 18:31:17,349 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:31:17,349 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 17 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:31:17,350 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 41 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:31:17,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-03-20 18:31:17,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 26. [2022-03-20 18:31:17,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:17,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2022-03-20 18:31:17,355 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 19 [2022-03-20 18:31:17,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:31:17,356 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2022-03-20 18:31:17,356 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:17,356 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2022-03-20 18:31:17,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-20 18:31:17,356 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:31:17,356 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:31:17,375 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 18:31:17,574 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:31:17,575 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:31:17,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:31:17,575 INFO L85 PathProgramCache]: Analyzing trace with hash 1594611826, now seen corresponding path program 3 times [2022-03-20 18:31:17,575 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:17,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [777486109] [2022-03-20 18:31:17,576 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:31:17,576 INFO L85 PathProgramCache]: Analyzing trace with hash 1594611826, now seen corresponding path program 4 times [2022-03-20 18:31:17,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:31:17,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [446911678] [2022-03-20 18:31:17,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:31:17,576 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:31:17,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:17,666 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:31:17,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:17,671 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:17,671 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:31:17,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [446911678] [2022-03-20 18:31:17,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [446911678] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:31:17,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [454072886] [2022-03-20 18:31:17,671 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:31:17,672 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:31:17,672 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:31:17,688 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) [2022-03-20 18:31:17,689 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 18:31:17,828 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:31:17,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:31:17,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 601 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 18:31:17,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:31:17,951 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:17,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:31:18,024 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:18,025 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [454072886] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:31:18,025 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:31:18,025 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 12 [2022-03-20 18:31:18,025 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:31:18,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [777486109] [2022-03-20 18:31:18,026 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [777486109] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:31:18,026 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:31:18,026 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:31:18,026 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753207091] [2022-03-20 18:31:18,026 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:31:18,026 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 18:31:18,026 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:18,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 18:31:18,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-03-20 18:31:18,027 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:18,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:31:18,151 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2022-03-20 18:31:18,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 18:31:18,151 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2022-03-20 18:31:18,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:31:18,152 INFO L225 Difference]: With dead ends: 46 [2022-03-20 18:31:18,152 INFO L226 Difference]: Without dead ends: 36 [2022-03-20 18:31:18,153 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2022-03-20 18:31:18,153 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 20 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:31:18,153 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 59 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:31:18,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-03-20 18:31:18,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 32. [2022-03-20 18:31:18,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:18,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2022-03-20 18:31:18,159 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 25 [2022-03-20 18:31:18,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:31:18,160 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2022-03-20 18:31:18,160 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:18,160 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2022-03-20 18:31:18,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-20 18:31:18,160 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:31:18,160 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:31:18,181 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 18:31:18,375 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-03-20 18:31:18,376 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:31:18,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:31:18,376 INFO L85 PathProgramCache]: Analyzing trace with hash 1841134202, now seen corresponding path program 5 times [2022-03-20 18:31:18,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:18,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1318451780] [2022-03-20 18:31:18,377 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:31:18,377 INFO L85 PathProgramCache]: Analyzing trace with hash 1841134202, now seen corresponding path program 6 times [2022-03-20 18:31:18,377 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:31:18,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1881830618] [2022-03-20 18:31:18,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:31:18,377 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:31:18,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:18,514 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:31:18,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:18,521 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 6 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:18,521 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:31:18,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1881830618] [2022-03-20 18:31:18,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1881830618] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:31:18,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [982522562] [2022-03-20 18:31:18,522 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:31:18,522 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:31:18,522 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:31:18,523 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) [2022-03-20 18:31:18,524 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 18:31:18,810 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-20 18:31:18,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:31:18,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:31:18,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:31:18,928 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 6 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:18,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:31:19,046 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 6 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:19,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [982522562] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:31:19,047 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:31:19,047 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 14 [2022-03-20 18:31:19,047 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:31:19,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1318451780] [2022-03-20 18:31:19,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1318451780] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:31:19,047 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:31:19,048 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:31:19,048 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522567542] [2022-03-20 18:31:19,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:31:19,048 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:31:19,048 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:19,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:31:19,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:31:19,049 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:19,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:31:19,195 INFO L93 Difference]: Finished difference Result 52 states and 55 transitions. [2022-03-20 18:31:19,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 18:31:19,195 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2022-03-20 18:31:19,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:31:19,196 INFO L225 Difference]: With dead ends: 52 [2022-03-20 18:31:19,196 INFO L226 Difference]: Without dead ends: 42 [2022-03-20 18:31:19,196 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=97, Invalid=283, Unknown=0, NotChecked=0, Total=380 [2022-03-20 18:31:19,197 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 23 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:31:19,197 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 81 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:31:19,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-03-20 18:31:19,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 38. [2022-03-20 18:31:19,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:19,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2022-03-20 18:31:19,204 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 31 [2022-03-20 18:31:19,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:31:19,204 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2022-03-20 18:31:19,204 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:19,204 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2022-03-20 18:31:19,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-20 18:31:19,205 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:31:19,205 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:31:19,234 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 18:31:19,415 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:31:19,415 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:31:19,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:31:19,416 INFO L85 PathProgramCache]: Analyzing trace with hash 1281324674, now seen corresponding path program 7 times [2022-03-20 18:31:19,416 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:19,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1856963957] [2022-03-20 18:31:19,416 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:31:19,416 INFO L85 PathProgramCache]: Analyzing trace with hash 1281324674, now seen corresponding path program 8 times [2022-03-20 18:31:19,417 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:31:19,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950351980] [2022-03-20 18:31:19,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:31:19,417 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:31:19,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:19,562 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:31:19,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:19,568 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 8 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:19,568 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:31:19,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950351980] [2022-03-20 18:31:19,568 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1950351980] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:31:19,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [868288496] [2022-03-20 18:31:19,568 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:31:19,568 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:31:19,568 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:31:19,569 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) [2022-03-20 18:31:19,571 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 18:31:19,745 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:31:19,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:31:19,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-20 18:31:19,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:31:19,900 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 8 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:19,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:31:20,047 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 8 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:20,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [868288496] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:31:20,047 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:31:20,047 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 16 [2022-03-20 18:31:20,047 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:31:20,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1856963957] [2022-03-20 18:31:20,048 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1856963957] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:31:20,048 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:31:20,048 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 18:31:20,048 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654414150] [2022-03-20 18:31:20,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:31:20,048 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 18:31:20,048 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:20,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 18:31:20,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2022-03-20 18:31:20,049 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:20,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:31:20,256 INFO L93 Difference]: Finished difference Result 58 states and 61 transitions. [2022-03-20 18:31:20,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 18:31:20,256 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2022-03-20 18:31:20,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:31:20,257 INFO L225 Difference]: With dead ends: 58 [2022-03-20 18:31:20,257 INFO L226 Difference]: Without dead ends: 48 [2022-03-20 18:31:20,257 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=125, Invalid=381, Unknown=0, NotChecked=0, Total=506 [2022-03-20 18:31:20,258 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 26 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:31:20,258 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 107 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:31:20,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-20 18:31:20,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 44. [2022-03-20 18:31:20,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 40 states have (on average 1.05) internal successors, (42), 40 states have internal predecessors, (42), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:20,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2022-03-20 18:31:20,267 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 37 [2022-03-20 18:31:20,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:31:20,267 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2022-03-20 18:31:20,267 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:20,267 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2022-03-20 18:31:20,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-20 18:31:20,273 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:31:20,273 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:31:20,308 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 18:31:20,486 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:31:20,486 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:31:20,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:31:20,487 INFO L85 PathProgramCache]: Analyzing trace with hash 935742602, now seen corresponding path program 9 times [2022-03-20 18:31:20,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:20,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [163940249] [2022-03-20 18:31:20,487 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:31:20,487 INFO L85 PathProgramCache]: Analyzing trace with hash 935742602, now seen corresponding path program 10 times [2022-03-20 18:31:20,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:31:20,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908400528] [2022-03-20 18:31:20,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:31:20,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:31:20,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:20,601 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:31:20,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:20,607 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 10 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:20,607 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:31:20,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908400528] [2022-03-20 18:31:20,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1908400528] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:31:20,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [330557179] [2022-03-20 18:31:20,608 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:31:20,608 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:31:20,608 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:31:20,624 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) [2022-03-20 18:31:20,634 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 18:31:20,798 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:31:20,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:31:20,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 667 conjuncts, 15 conjunts are in the unsatisfiable core [2022-03-20 18:31:20,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:31:20,936 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 10 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:20,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:31:21,101 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 10 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:21,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [330557179] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:31:21,102 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:31:21,102 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 18 [2022-03-20 18:31:21,102 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:31:21,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [163940249] [2022-03-20 18:31:21,102 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [163940249] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:31:21,102 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:31:21,102 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 18:31:21,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966170427] [2022-03-20 18:31:21,102 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:31:21,103 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 18:31:21,103 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:21,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 18:31:21,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=234, Unknown=0, NotChecked=0, Total=306 [2022-03-20 18:31:21,103 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand has 10 states, 10 states have (on average 4.0) internal successors, (40), 9 states have internal predecessors, (40), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:21,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:31:21,346 INFO L93 Difference]: Finished difference Result 64 states and 67 transitions. [2022-03-20 18:31:21,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 18:31:21,347 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.0) internal successors, (40), 9 states have internal predecessors, (40), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2022-03-20 18:31:21,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:31:21,347 INFO L225 Difference]: With dead ends: 64 [2022-03-20 18:31:21,347 INFO L226 Difference]: Without dead ends: 54 [2022-03-20 18:31:21,348 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=157, Invalid=493, Unknown=0, NotChecked=0, Total=650 [2022-03-20 18:31:21,348 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 29 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 201 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 201 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:31:21,348 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 137 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 201 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:31:21,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-20 18:31:21,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 50. [2022-03-20 18:31:21,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:21,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2022-03-20 18:31:21,357 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 43 [2022-03-20 18:31:21,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:31:21,357 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2022-03-20 18:31:21,358 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.0) internal successors, (40), 9 states have internal predecessors, (40), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:21,358 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2022-03-20 18:31:21,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-20 18:31:21,358 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:31:21,358 INFO L499 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:31:21,382 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-20 18:31:21,582 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:31:21,582 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:31:21,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:31:21,583 INFO L85 PathProgramCache]: Analyzing trace with hash -1687782254, now seen corresponding path program 11 times [2022-03-20 18:31:21,583 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:21,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [839928231] [2022-03-20 18:31:21,584 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:31:21,584 INFO L85 PathProgramCache]: Analyzing trace with hash -1687782254, now seen corresponding path program 12 times [2022-03-20 18:31:21,584 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:31:21,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [597043490] [2022-03-20 18:31:21,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:31:21,584 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:31:21,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:21,732 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:31:21,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:21,736 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 12 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:21,736 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:31:21,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [597043490] [2022-03-20 18:31:21,736 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [597043490] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:31:21,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2002758436] [2022-03-20 18:31:21,736 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:31:21,736 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:31:21,737 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:31:21,738 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) [2022-03-20 18:31:21,739 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-20 18:31:22,338 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-03-20 18:31:22,339 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:31:22,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 50 conjunts are in the unsatisfiable core [2022-03-20 18:31:22,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:31:23,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-03-20 18:31:23,075 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-03-20 18:31:23,076 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 11 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 47 treesize of output 67 [2022-03-20 18:31:23,394 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 24 proven. 72 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-20 18:31:23,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:31:24,826 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 44 proven. 46 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-03-20 18:31:24,826 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2002758436] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:31:24,826 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:31:24,826 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 11] total 32 [2022-03-20 18:31:24,826 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:31:24,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [839928231] [2022-03-20 18:31:24,826 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [839928231] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:31:24,826 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:31:24,826 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:31:24,827 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958353271] [2022-03-20 18:31:24,827 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:31:24,827 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 18:31:24,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:24,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 18:31:24,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=816, Unknown=0, NotChecked=0, Total=992 [2022-03-20 18:31:24,828 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 10 states have internal predecessors, (46), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:25,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:31:25,138 INFO L93 Difference]: Finished difference Result 70 states and 73 transitions. [2022-03-20 18:31:25,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 18:31:25,138 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 10 states have internal predecessors, (46), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2022-03-20 18:31:25,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:31:25,139 INFO L225 Difference]: With dead ends: 70 [2022-03-20 18:31:25,139 INFO L226 Difference]: Without dead ends: 60 [2022-03-20 18:31:25,140 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=270, Invalid=1370, Unknown=0, NotChecked=0, Total=1640 [2022-03-20 18:31:25,140 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 32 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:31:25,140 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 171 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:31:25,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-03-20 18:31:25,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2022-03-20 18:31:25,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 52 states have (on average 1.0384615384615385) internal successors, (54), 52 states have internal predecessors, (54), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:25,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2022-03-20 18:31:25,148 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 49 [2022-03-20 18:31:25,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:31:25,149 INFO L478 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2022-03-20 18:31:25,149 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.181818181818182) internal successors, (46), 10 states have internal predecessors, (46), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:25,149 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2022-03-20 18:31:25,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-03-20 18:31:25,149 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:31:25,150 INFO L499 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:31:25,175 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-20 18:31:25,363 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:31:25,363 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:31:25,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:31:25,364 INFO L85 PathProgramCache]: Analyzing trace with hash -1722513766, now seen corresponding path program 13 times [2022-03-20 18:31:25,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:25,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1975726973] [2022-03-20 18:31:25,365 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:31:25,365 INFO L85 PathProgramCache]: Analyzing trace with hash -1722513766, now seen corresponding path program 14 times [2022-03-20 18:31:25,365 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:31:25,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [604896147] [2022-03-20 18:31:25,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:31:25,365 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:31:25,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:25,548 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:31:25,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:25,551 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 14 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:25,551 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:31:25,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [604896147] [2022-03-20 18:31:25,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [604896147] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:31:25,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1917219078] [2022-03-20 18:31:25,552 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:31:25,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:31:25,552 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:31:25,561 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) [2022-03-20 18:31:25,562 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-20 18:31:25,769 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:31:25,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:31:25,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 711 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-20 18:31:25,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:31:25,959 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 14 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:25,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:31:26,186 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 14 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:26,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1917219078] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:31:26,187 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:31:26,187 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 22 [2022-03-20 18:31:26,187 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:31:26,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1975726973] [2022-03-20 18:31:26,187 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1975726973] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:31:26,187 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:31:26,187 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 18:31:26,187 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497031738] [2022-03-20 18:31:26,187 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:31:26,187 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 18:31:26,187 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:26,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 18:31:26,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=354, Unknown=0, NotChecked=0, Total=462 [2022-03-20 18:31:26,188 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 12 states, 12 states have (on average 4.333333333333333) internal successors, (52), 11 states have internal predecessors, (52), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:26,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:31:26,495 INFO L93 Difference]: Finished difference Result 76 states and 79 transitions. [2022-03-20 18:31:26,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 18:31:26,495 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.333333333333333) internal successors, (52), 11 states have internal predecessors, (52), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2022-03-20 18:31:26,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:31:26,496 INFO L225 Difference]: With dead ends: 76 [2022-03-20 18:31:26,496 INFO L226 Difference]: Without dead ends: 66 [2022-03-20 18:31:26,497 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 101 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=233, Invalid=759, Unknown=0, NotChecked=0, Total=992 [2022-03-20 18:31:26,497 INFO L913 BasicCegarLoop]: 26 mSDtfsCounter, 35 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 329 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:31:26,497 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 209 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 329 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:31:26,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-03-20 18:31:26,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 62. [2022-03-20 18:31:26,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:26,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2022-03-20 18:31:26,504 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 55 [2022-03-20 18:31:26,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:31:26,504 INFO L478 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2022-03-20 18:31:26,504 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.333333333333333) internal successors, (52), 11 states have internal predecessors, (52), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:26,505 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2022-03-20 18:31:26,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-03-20 18:31:26,505 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:31:26,505 INFO L499 BasicCegarLoop]: trace histogram [9, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:31:26,535 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-03-20 18:31:26,723 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:31:26,723 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:31:26,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:31:26,724 INFO L85 PathProgramCache]: Analyzing trace with hash -1840977246, now seen corresponding path program 15 times [2022-03-20 18:31:26,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:26,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1700279161] [2022-03-20 18:31:26,724 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:31:26,724 INFO L85 PathProgramCache]: Analyzing trace with hash -1840977246, now seen corresponding path program 16 times [2022-03-20 18:31:26,725 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:31:26,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135223452] [2022-03-20 18:31:26,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:31:26,725 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:31:26,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:26,934 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:31:26,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:26,938 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 16 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:26,938 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:31:26,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135223452] [2022-03-20 18:31:26,939 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1135223452] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:31:26,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [80053567] [2022-03-20 18:31:26,939 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:31:26,939 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:31:26,939 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:31:26,940 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) [2022-03-20 18:31:26,971 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-20 18:31:27,177 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:31:27,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:31:27,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 733 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-20 18:31:27,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:31:27,354 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 16 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:27,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:31:27,627 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 16 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:27,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [80053567] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:31:27,627 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:31:27,627 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 24 [2022-03-20 18:31:27,627 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:31:27,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1700279161] [2022-03-20 18:31:27,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1700279161] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:31:27,628 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:31:27,628 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 18:31:27,628 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953937487] [2022-03-20 18:31:27,628 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:31:27,628 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 18:31:27,628 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:27,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 18:31:27,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=423, Unknown=0, NotChecked=0, Total=552 [2022-03-20 18:31:27,629 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 13 states, 13 states have (on average 4.461538461538462) internal successors, (58), 12 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:27,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:31:27,994 INFO L93 Difference]: Finished difference Result 82 states and 85 transitions. [2022-03-20 18:31:27,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 18:31:27,994 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 4.461538461538462) internal successors, (58), 12 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2022-03-20 18:31:27,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:31:27,995 INFO L225 Difference]: With dead ends: 82 [2022-03-20 18:31:27,995 INFO L226 Difference]: Without dead ends: 72 [2022-03-20 18:31:27,996 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=277, Invalid=913, Unknown=0, NotChecked=0, Total=1190 [2022-03-20 18:31:27,996 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 38 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 405 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 405 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:31:27,996 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 251 Invalid, 425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 405 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:31:27,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-03-20 18:31:28,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 68. [2022-03-20 18:31:28,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 64 states have (on average 1.03125) internal successors, (66), 64 states have internal predecessors, (66), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:28,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2022-03-20 18:31:28,004 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 61 [2022-03-20 18:31:28,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:31:28,005 INFO L478 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2022-03-20 18:31:28,005 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 4.461538461538462) internal successors, (58), 12 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:31:28,005 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2022-03-20 18:31:28,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-03-20 18:31:28,005 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:31:28,005 INFO L499 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:31:28,046 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-20 18:31:28,228 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-03-20 18:31:28,228 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:31:28,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:31:28,228 INFO L85 PathProgramCache]: Analyzing trace with hash -1383323478, now seen corresponding path program 17 times [2022-03-20 18:31:28,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:31:28,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1477385164] [2022-03-20 18:31:28,229 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:31:28,230 INFO L85 PathProgramCache]: Analyzing trace with hash -1383323478, now seen corresponding path program 18 times [2022-03-20 18:31:28,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:31:28,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [242679307] [2022-03-20 18:31:28,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:31:28,230 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:31:28,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:28,393 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:31:28,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:31:28,396 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 18 proven. 243 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:31:28,397 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:31:28,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [242679307] [2022-03-20 18:31:28,397 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [242679307] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:31:28,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [278805366] [2022-03-20 18:31:28,397 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:31:28,397 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:31:28,397 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:31:28,420 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) [2022-03-20 18:31:28,421 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-20 18:31:33,323 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-03-20 18:31:33,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:31:33,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 73 conjunts are in the unsatisfiable core [2022-03-20 18:31:33,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:31:42,072 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-03-20 18:31:42,073 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 30 select indices, 30 select index equivalence classes, 406 disjoint index pairs (out of 435 index pairs), introduced 30 new quantified variables, introduced 435 case distinctions, treesize of input 215 treesize of output 439 [2022-03-20 18:32:17,368 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 50 proven. 35 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-03-20 18:32:17,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:32:18,460 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 18 proven. 67 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-03-20 18:32:18,461 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [278805366] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:32:18,461 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:32:18,461 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10, 8] total 28 [2022-03-20 18:32:18,461 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:32:18,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1477385164] [2022-03-20 18:32:18,461 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1477385164] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:32:18,461 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:32:18,461 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 18:32:18,461 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803113921] [2022-03-20 18:32:18,461 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:32:18,461 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 18:32:18,462 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:32:18,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 18:32:18,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=635, Unknown=0, NotChecked=0, Total=756 [2022-03-20 18:32:18,462 INFO L87 Difference]: Start difference. First operand 68 states and 69 transitions. Second operand has 14 states, 14 states have (on average 4.571428571428571) internal successors, (64), 13 states have internal predecessors, (64), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:18,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:32:18,916 INFO L93 Difference]: Finished difference Result 88 states and 91 transitions. [2022-03-20 18:32:18,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 18:32:18,916 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.571428571428571) internal successors, (64), 13 states have internal predecessors, (64), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2022-03-20 18:32:18,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:32:18,918 INFO L225 Difference]: With dead ends: 88 [2022-03-20 18:32:18,918 INFO L226 Difference]: Without dead ends: 78 [2022-03-20 18:32:18,918 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=240, Invalid=1320, Unknown=0, NotChecked=0, Total=1560 [2022-03-20 18:32:18,919 INFO L913 BasicCegarLoop]: 30 mSDtfsCounter, 41 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 489 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 297 SdHoareTripleChecker+Invalid, 511 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:32:18,919 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 297 Invalid, 511 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 489 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:32:18,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-03-20 18:32:18,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 74. [2022-03-20 18:32:18,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:18,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 75 transitions. [2022-03-20 18:32:18,935 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 75 transitions. Word has length 67 [2022-03-20 18:32:18,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:32:18,935 INFO L478 AbstractCegarLoop]: Abstraction has 74 states and 75 transitions. [2022-03-20 18:32:18,935 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.571428571428571) internal successors, (64), 13 states have internal predecessors, (64), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:18,935 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 75 transitions. [2022-03-20 18:32:18,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-03-20 18:32:18,936 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:32:18,936 INFO L499 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:32:18,948 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-03-20 18:32:19,148 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:32:19,148 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:32:19,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:32:19,149 INFO L85 PathProgramCache]: Analyzing trace with hash 1629405362, now seen corresponding path program 19 times [2022-03-20 18:32:19,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:32:19,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [163590634] [2022-03-20 18:32:19,150 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:32:19,150 INFO L85 PathProgramCache]: Analyzing trace with hash 1629405362, now seen corresponding path program 20 times [2022-03-20 18:32:19,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:32:19,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825502683] [2022-03-20 18:32:19,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:32:19,151 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:32:19,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:32:19,374 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:32:19,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:32:19,386 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 20 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:19,386 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:32:19,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825502683] [2022-03-20 18:32:19,387 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1825502683] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:32:19,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [894068487] [2022-03-20 18:32:19,387 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:32:19,387 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:32:19,387 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:32:19,388 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) [2022-03-20 18:32:19,389 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-20 18:32:19,610 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:32:19,610 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:32:19,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 777 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-20 18:32:19,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:32:19,832 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 20 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:19,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:32:20,159 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 20 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:20,159 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [894068487] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:32:20,159 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:32:20,160 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 28 [2022-03-20 18:32:20,160 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:32:20,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [163590634] [2022-03-20 18:32:20,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [163590634] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:32:20,160 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:32:20,160 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 18:32:20,160 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053330628] [2022-03-20 18:32:20,160 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:32:20,160 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 18:32:20,160 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:32:20,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 18:32:20,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=579, Unknown=0, NotChecked=0, Total=756 [2022-03-20 18:32:20,161 INFO L87 Difference]: Start difference. First operand 74 states and 75 transitions. Second operand has 15 states, 15 states have (on average 4.666666666666667) internal successors, (70), 14 states have internal predecessors, (70), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:20,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:32:20,601 INFO L93 Difference]: Finished difference Result 94 states and 97 transitions. [2022-03-20 18:32:20,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-20 18:32:20,601 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 4.666666666666667) internal successors, (70), 14 states have internal predecessors, (70), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2022-03-20 18:32:20,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:32:20,602 INFO L225 Difference]: With dead ends: 94 [2022-03-20 18:32:20,602 INFO L226 Difference]: Without dead ends: 84 [2022-03-20 18:32:20,602 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 134 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=377, Invalid=1263, Unknown=0, NotChecked=0, Total=1640 [2022-03-20 18:32:20,603 INFO L913 BasicCegarLoop]: 32 mSDtfsCounter, 44 mSDsluCounter, 315 mSDsCounter, 0 mSdLazyCounter, 581 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 581 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:32:20,603 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 347 Invalid, 605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 581 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:32:20,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-03-20 18:32:20,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 80. [2022-03-20 18:32:20,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 76 states have (on average 1.0263157894736843) internal successors, (78), 76 states have internal predecessors, (78), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:20,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2022-03-20 18:32:20,611 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 73 [2022-03-20 18:32:20,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:32:20,612 INFO L478 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2022-03-20 18:32:20,612 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 4.666666666666667) internal successors, (70), 14 states have internal predecessors, (70), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:20,612 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2022-03-20 18:32:20,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-03-20 18:32:20,612 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:32:20,612 INFO L499 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:32:20,631 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-20 18:32:20,830 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-03-20 18:32:20,831 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:32:20,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:32:20,831 INFO L85 PathProgramCache]: Analyzing trace with hash -107924806, now seen corresponding path program 21 times [2022-03-20 18:32:20,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:32:20,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [63800770] [2022-03-20 18:32:20,832 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:32:20,832 INFO L85 PathProgramCache]: Analyzing trace with hash -107924806, now seen corresponding path program 22 times [2022-03-20 18:32:20,832 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:32:20,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [484998819] [2022-03-20 18:32:20,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:32:20,832 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:32:20,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:32:21,054 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:32:21,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:32:21,060 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 22 proven. 363 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:21,060 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:32:21,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [484998819] [2022-03-20 18:32:21,060 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [484998819] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:32:21,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [170116805] [2022-03-20 18:32:21,060 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:32:21,060 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:32:21,060 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:32:21,068 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) [2022-03-20 18:32:21,083 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-20 18:32:21,304 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:32:21,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:32:21,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 799 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-20 18:32:21,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:32:21,562 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 22 proven. 363 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:21,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:32:21,953 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 22 proven. 363 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:21,954 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [170116805] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:32:21,954 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:32:21,954 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 30 [2022-03-20 18:32:21,954 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:32:21,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [63800770] [2022-03-20 18:32:21,954 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [63800770] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:32:21,954 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:32:21,954 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 18:32:21,954 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494328050] [2022-03-20 18:32:21,954 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:32:21,955 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 18:32:21,955 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:32:21,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 18:32:21,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=666, Unknown=0, NotChecked=0, Total=870 [2022-03-20 18:32:21,955 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 16 states, 16 states have (on average 4.75) internal successors, (76), 15 states have internal predecessors, (76), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:22,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:32:22,460 INFO L93 Difference]: Finished difference Result 100 states and 103 transitions. [2022-03-20 18:32:22,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 18:32:22,460 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.75) internal successors, (76), 15 states have internal predecessors, (76), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2022-03-20 18:32:22,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:32:22,460 INFO L225 Difference]: With dead ends: 100 [2022-03-20 18:32:22,461 INFO L226 Difference]: Without dead ends: 90 [2022-03-20 18:32:22,461 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 145 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=433, Invalid=1459, Unknown=0, NotChecked=0, Total=1892 [2022-03-20 18:32:22,461 INFO L913 BasicCegarLoop]: 34 mSDtfsCounter, 47 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 681 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 401 SdHoareTripleChecker+Invalid, 707 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 681 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:32:22,462 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 401 Invalid, 707 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 681 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:32:22,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-03-20 18:32:22,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 86. [2022-03-20 18:32:22,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:22,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2022-03-20 18:32:22,475 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 79 [2022-03-20 18:32:22,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:32:22,476 INFO L478 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2022-03-20 18:32:22,476 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 4.75) internal successors, (76), 15 states have internal predecessors, (76), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:22,476 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2022-03-20 18:32:22,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-03-20 18:32:22,476 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:32:22,477 INFO L499 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:32:22,494 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-20 18:32:22,681 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-03-20 18:32:22,681 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:32:22,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:32:22,681 INFO L85 PathProgramCache]: Analyzing trace with hash 571997890, now seen corresponding path program 23 times [2022-03-20 18:32:22,682 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:32:22,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [318447113] [2022-03-20 18:32:22,682 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:32:22,682 INFO L85 PathProgramCache]: Analyzing trace with hash 571997890, now seen corresponding path program 24 times [2022-03-20 18:32:22,682 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:32:22,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [116577227] [2022-03-20 18:32:22,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:32:22,682 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:32:22,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:32:23,003 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:32:23,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:32:23,006 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 24 proven. 432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:23,007 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:32:23,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [116577227] [2022-03-20 18:32:23,007 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [116577227] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:32:23,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1840628260] [2022-03-20 18:32:23,007 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:32:23,007 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:32:23,007 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:32:23,008 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) [2022-03-20 18:32:23,009 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-20 18:32:25,395 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-03-20 18:32:25,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:32:25,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-20 18:32:25,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:32:25,753 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-03-20 18:32:25,753 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2022-03-20 18:32:25,857 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 68 proven. 47 refuted. 0 times theorem prover too weak. 341 trivial. 0 not checked. [2022-03-20 18:32:25,857 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:32:27,330 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 24 proven. 91 refuted. 0 times theorem prover too weak. 341 trivial. 0 not checked. [2022-03-20 18:32:27,330 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1840628260] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:32:27,331 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:32:27,331 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 10, 8] total 31 [2022-03-20 18:32:27,331 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:32:27,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [318447113] [2022-03-20 18:32:27,331 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [318447113] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:32:27,331 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:32:27,331 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 18:32:27,331 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232469719] [2022-03-20 18:32:27,331 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:32:27,331 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 18:32:27,331 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:32:27,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 18:32:27,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=777, Unknown=0, NotChecked=0, Total=930 [2022-03-20 18:32:27,332 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand has 17 states, 17 states have (on average 4.823529411764706) internal successors, (82), 16 states have internal predecessors, (82), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:27,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:32:27,908 INFO L93 Difference]: Finished difference Result 106 states and 109 transitions. [2022-03-20 18:32:27,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 18:32:27,908 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.823529411764706) internal successors, (82), 16 states have internal predecessors, (82), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2022-03-20 18:32:27,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:32:27,909 INFO L225 Difference]: With dead ends: 106 [2022-03-20 18:32:27,909 INFO L226 Difference]: Without dead ends: 96 [2022-03-20 18:32:27,910 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=313, Invalid=1757, Unknown=0, NotChecked=0, Total=2070 [2022-03-20 18:32:27,910 INFO L913 BasicCegarLoop]: 36 mSDtfsCounter, 50 mSDsluCounter, 423 mSDsCounter, 0 mSdLazyCounter, 789 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 459 SdHoareTripleChecker+Invalid, 817 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 789 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:32:27,910 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 459 Invalid, 817 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 789 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:32:27,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-03-20 18:32:27,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 92. [2022-03-20 18:32:27,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 88 states have (on average 1.0227272727272727) internal successors, (90), 88 states have internal predecessors, (90), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:27,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 93 transitions. [2022-03-20 18:32:27,920 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 93 transitions. Word has length 85 [2022-03-20 18:32:27,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:32:27,921 INFO L478 AbstractCegarLoop]: Abstraction has 92 states and 93 transitions. [2022-03-20 18:32:27,921 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 4.823529411764706) internal successors, (82), 16 states have internal predecessors, (82), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:27,921 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 93 transitions. [2022-03-20 18:32:27,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-03-20 18:32:27,922 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:32:27,922 INFO L499 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:32:27,931 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-03-20 18:32:28,124 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-03-20 18:32:28,124 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:32:28,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:32:28,124 INFO L85 PathProgramCache]: Analyzing trace with hash 1820828874, now seen corresponding path program 25 times [2022-03-20 18:32:28,125 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:32:28,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1865756810] [2022-03-20 18:32:28,125 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:32:28,125 INFO L85 PathProgramCache]: Analyzing trace with hash 1820828874, now seen corresponding path program 26 times [2022-03-20 18:32:28,125 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:32:28,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908572805] [2022-03-20 18:32:28,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:32:28,125 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:32:28,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:32:28,301 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:32:28,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:32:28,304 INFO L134 CoverageAnalysis]: Checked inductivity of 533 backedges. 26 proven. 507 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:28,304 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:32:28,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [908572805] [2022-03-20 18:32:28,304 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [908572805] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:32:28,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [36128383] [2022-03-20 18:32:28,305 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:32:28,305 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:32:28,305 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:32:28,306 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) [2022-03-20 18:32:28,321 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-20 18:32:28,595 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:32:28,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:32:28,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 843 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-20 18:32:28,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:32:28,868 INFO L134 CoverageAnalysis]: Checked inductivity of 533 backedges. 26 proven. 507 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:28,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:32:29,363 INFO L134 CoverageAnalysis]: Checked inductivity of 533 backedges. 26 proven. 507 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:29,364 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [36128383] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:32:29,364 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:32:29,364 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 34 [2022-03-20 18:32:29,364 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:32:29,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1865756810] [2022-03-20 18:32:29,364 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1865756810] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:32:29,364 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:32:29,364 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 18:32:29,364 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751558841] [2022-03-20 18:32:29,364 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:32:29,364 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 18:32:29,365 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:32:29,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 18:32:29,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=858, Unknown=0, NotChecked=0, Total=1122 [2022-03-20 18:32:29,365 INFO L87 Difference]: Start difference. First operand 92 states and 93 transitions. Second operand has 18 states, 18 states have (on average 4.888888888888889) internal successors, (88), 17 states have internal predecessors, (88), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:29,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:32:29,936 INFO L93 Difference]: Finished difference Result 112 states and 115 transitions. [2022-03-20 18:32:29,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-20 18:32:29,936 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 4.888888888888889) internal successors, (88), 17 states have internal predecessors, (88), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 91 [2022-03-20 18:32:29,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:32:29,937 INFO L225 Difference]: With dead ends: 112 [2022-03-20 18:32:29,937 INFO L226 Difference]: Without dead ends: 102 [2022-03-20 18:32:29,937 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 167 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=557, Invalid=1893, Unknown=0, NotChecked=0, Total=2450 [2022-03-20 18:32:29,938 INFO L913 BasicCegarLoop]: 38 mSDtfsCounter, 53 mSDsluCounter, 483 mSDsCounter, 0 mSdLazyCounter, 905 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 521 SdHoareTripleChecker+Invalid, 935 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 905 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:32:29,938 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 521 Invalid, 935 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 905 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 18:32:29,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-03-20 18:32:29,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 98. [2022-03-20 18:32:29,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 94 states have (on average 1.0212765957446808) internal successors, (96), 94 states have internal predecessors, (96), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:29,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 99 transitions. [2022-03-20 18:32:29,950 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 99 transitions. Word has length 91 [2022-03-20 18:32:29,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:32:29,950 INFO L478 AbstractCegarLoop]: Abstraction has 98 states and 99 transitions. [2022-03-20 18:32:29,950 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 4.888888888888889) internal successors, (88), 17 states have internal predecessors, (88), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:29,950 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 99 transitions. [2022-03-20 18:32:29,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-03-20 18:32:29,951 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:32:29,951 INFO L499 BasicCegarLoop]: trace histogram [15, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:32:29,969 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-20 18:32:30,169 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-03-20 18:32:30,170 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:32:30,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:32:30,170 INFO L85 PathProgramCache]: Analyzing trace with hash -648764206, now seen corresponding path program 27 times [2022-03-20 18:32:30,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:32:30,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [484296415] [2022-03-20 18:32:30,171 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:32:30,171 INFO L85 PathProgramCache]: Analyzing trace with hash -648764206, now seen corresponding path program 28 times [2022-03-20 18:32:30,171 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:32:30,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [360402766] [2022-03-20 18:32:30,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:32:30,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:32:30,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:32:30,372 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:32:30,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:32:30,375 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 28 proven. 588 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:30,375 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:32:30,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [360402766] [2022-03-20 18:32:30,375 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [360402766] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:32:30,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [143148167] [2022-03-20 18:32:30,375 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:32:30,375 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:32:30,375 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:32:30,376 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) [2022-03-20 18:32:30,377 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-20 18:32:30,570 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:32:30,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:32:30,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 865 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-20 18:32:30,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:32:30,859 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 28 proven. 588 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:30,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:32:31,257 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 28 proven. 588 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:31,257 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [143148167] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:32:31,257 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:32:31,257 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 36 [2022-03-20 18:32:31,257 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:32:31,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [484296415] [2022-03-20 18:32:31,257 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [484296415] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:32:31,257 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:32:31,257 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 18:32:31,257 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192908713] [2022-03-20 18:32:31,258 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:32:31,258 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 18:32:31,258 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:32:31,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 18:32:31,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=963, Unknown=0, NotChecked=0, Total=1260 [2022-03-20 18:32:31,259 INFO L87 Difference]: Start difference. First operand 98 states and 99 transitions. Second operand has 19 states, 19 states have (on average 4.947368421052632) internal successors, (94), 18 states have internal predecessors, (94), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:31,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:32:31,855 INFO L93 Difference]: Finished difference Result 118 states and 121 transitions. [2022-03-20 18:32:31,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-20 18:32:31,855 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 4.947368421052632) internal successors, (94), 18 states have internal predecessors, (94), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2022-03-20 18:32:31,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:32:31,856 INFO L225 Difference]: With dead ends: 118 [2022-03-20 18:32:31,856 INFO L226 Difference]: Without dead ends: 108 [2022-03-20 18:32:31,857 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 178 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=625, Invalid=2131, Unknown=0, NotChecked=0, Total=2756 [2022-03-20 18:32:31,857 INFO L913 BasicCegarLoop]: 40 mSDtfsCounter, 56 mSDsluCounter, 547 mSDsCounter, 0 mSdLazyCounter, 1029 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 587 SdHoareTripleChecker+Invalid, 1061 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 1029 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:32:31,857 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 587 Invalid, 1061 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 1029 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 18:32:31,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-03-20 18:32:31,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 104. [2022-03-20 18:32:31,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 100 states have (on average 1.02) internal successors, (102), 100 states have internal predecessors, (102), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:31,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 105 transitions. [2022-03-20 18:32:31,888 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 105 transitions. Word has length 97 [2022-03-20 18:32:31,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:32:31,889 INFO L478 AbstractCegarLoop]: Abstraction has 104 states and 105 transitions. [2022-03-20 18:32:31,889 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 4.947368421052632) internal successors, (94), 18 states have internal predecessors, (94), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:31,889 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 105 transitions. [2022-03-20 18:32:31,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-03-20 18:32:31,889 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:32:31,889 INFO L499 BasicCegarLoop]: trace histogram [16, 16, 16, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:32:31,907 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-03-20 18:32:32,095 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:32:32,095 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:32:32,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:32:32,095 INFO L85 PathProgramCache]: Analyzing trace with hash 1603501786, now seen corresponding path program 29 times [2022-03-20 18:32:32,095 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:32:32,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [902015776] [2022-03-20 18:32:32,097 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:32:32,097 INFO L85 PathProgramCache]: Analyzing trace with hash 1603501786, now seen corresponding path program 30 times [2022-03-20 18:32:32,097 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:32:32,097 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1174052970] [2022-03-20 18:32:32,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:32:32,097 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:32:32,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:32:32,421 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:32:32,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:32:32,424 INFO L134 CoverageAnalysis]: Checked inductivity of 705 backedges. 30 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:32,424 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:32:32,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1174052970] [2022-03-20 18:32:32,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1174052970] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:32:32,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1785414860] [2022-03-20 18:32:32,425 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:32:32,425 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:32:32,425 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:32:32,426 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:32:32,427 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-20 18:32:35,245 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-03-20 18:32:35,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:32:35,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 23 conjunts are in the unsatisfiable core [2022-03-20 18:32:35,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:32:35,634 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-03-20 18:32:35,635 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 19 [2022-03-20 18:32:35,728 INFO L134 CoverageAnalysis]: Checked inductivity of 705 backedges. 86 proven. 59 refuted. 0 times theorem prover too weak. 560 trivial. 0 not checked. [2022-03-20 18:32:35,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:32:37,475 INFO L134 CoverageAnalysis]: Checked inductivity of 705 backedges. 30 proven. 115 refuted. 0 times theorem prover too weak. 560 trivial. 0 not checked. [2022-03-20 18:32:37,476 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1785414860] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:32:37,476 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:32:37,476 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 8, 8] total 32 [2022-03-20 18:32:37,476 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:32:37,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [902015776] [2022-03-20 18:32:37,476 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [902015776] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:32:37,476 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:32:37,476 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 18:32:37,476 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587956775] [2022-03-20 18:32:37,476 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:32:37,476 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 18:32:37,476 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:32:37,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 18:32:37,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=819, Unknown=0, NotChecked=0, Total=992 [2022-03-20 18:32:37,477 INFO L87 Difference]: Start difference. First operand 104 states and 105 transitions. Second operand has 20 states, 20 states have (on average 5.0) internal successors, (100), 19 states have internal predecessors, (100), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:38,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:32:38,255 INFO L93 Difference]: Finished difference Result 124 states and 127 transitions. [2022-03-20 18:32:38,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-20 18:32:38,256 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 5.0) internal successors, (100), 19 states have internal predecessors, (100), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 103 [2022-03-20 18:32:38,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:32:38,256 INFO L225 Difference]: With dead ends: 124 [2022-03-20 18:32:38,256 INFO L226 Difference]: Without dead ends: 114 [2022-03-20 18:32:38,257 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 196 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=366, Invalid=2084, Unknown=0, NotChecked=0, Total=2450 [2022-03-20 18:32:38,257 INFO L913 BasicCegarLoop]: 42 mSDtfsCounter, 59 mSDsluCounter, 615 mSDsCounter, 0 mSdLazyCounter, 1161 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 657 SdHoareTripleChecker+Invalid, 1195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 1161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:32:38,257 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 657 Invalid, 1195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 1161 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:32:38,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-03-20 18:32:38,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 110. [2022-03-20 18:32:38,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 106 states have (on average 1.0188679245283019) internal successors, (108), 106 states have internal predecessors, (108), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:38,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 111 transitions. [2022-03-20 18:32:38,271 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 111 transitions. Word has length 103 [2022-03-20 18:32:38,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:32:38,271 INFO L478 AbstractCegarLoop]: Abstraction has 110 states and 111 transitions. [2022-03-20 18:32:38,272 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 5.0) internal successors, (100), 19 states have internal predecessors, (100), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:38,272 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 111 transitions. [2022-03-20 18:32:38,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2022-03-20 18:32:38,274 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:32:38,274 INFO L499 BasicCegarLoop]: trace histogram [17, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:32:38,298 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-20 18:32:38,487 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-03-20 18:32:38,488 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:32:38,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:32:38,488 INFO L85 PathProgramCache]: Analyzing trace with hash 1962455778, now seen corresponding path program 31 times [2022-03-20 18:32:38,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:32:38,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [427157367] [2022-03-20 18:32:38,489 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:32:38,489 INFO L85 PathProgramCache]: Analyzing trace with hash 1962455778, now seen corresponding path program 32 times [2022-03-20 18:32:38,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:32:38,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [823787089] [2022-03-20 18:32:38,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:32:38,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:32:38,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:32:38,799 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:32:38,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:32:38,802 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 32 proven. 768 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:38,802 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:32:38,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [823787089] [2022-03-20 18:32:38,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [823787089] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:32:38,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590527651] [2022-03-20 18:32:38,803 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:32:38,804 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:32:38,804 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:32:38,805 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:32:38,860 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-20 18:32:39,126 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:32:39,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:32:39,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 909 conjuncts, 37 conjunts are in the unsatisfiable core [2022-03-20 18:32:39,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:32:39,397 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 32 proven. 768 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:39,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:32:40,033 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 32 proven. 768 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:40,033 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [590527651] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:32:40,034 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:32:40,034 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 40 [2022-03-20 18:32:40,034 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:32:40,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [427157367] [2022-03-20 18:32:40,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [427157367] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:32:40,034 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:32:40,034 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-20 18:32:40,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348938880] [2022-03-20 18:32:40,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:32:40,035 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-20 18:32:40,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:32:40,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-20 18:32:40,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=369, Invalid=1191, Unknown=0, NotChecked=0, Total=1560 [2022-03-20 18:32:40,036 INFO L87 Difference]: Start difference. First operand 110 states and 111 transitions. Second operand has 21 states, 21 states have (on average 5.0476190476190474) internal successors, (106), 20 states have internal predecessors, (106), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:40,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:32:40,827 INFO L93 Difference]: Finished difference Result 130 states and 133 transitions. [2022-03-20 18:32:40,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 18:32:40,827 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 5.0476190476190474) internal successors, (106), 20 states have internal predecessors, (106), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 109 [2022-03-20 18:32:40,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:32:40,828 INFO L225 Difference]: With dead ends: 130 [2022-03-20 18:32:40,828 INFO L226 Difference]: Without dead ends: 120 [2022-03-20 18:32:40,829 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 200 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=773, Invalid=2649, Unknown=0, NotChecked=0, Total=3422 [2022-03-20 18:32:40,829 INFO L913 BasicCegarLoop]: 44 mSDtfsCounter, 62 mSDsluCounter, 687 mSDsCounter, 0 mSdLazyCounter, 1301 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 731 SdHoareTripleChecker+Invalid, 1337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 1301 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:32:40,829 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 731 Invalid, 1337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 1301 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:32:40,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-03-20 18:32:40,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 116. [2022-03-20 18:32:40,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 112 states have (on average 1.0178571428571428) internal successors, (114), 112 states have internal predecessors, (114), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:40,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 117 transitions. [2022-03-20 18:32:40,845 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 117 transitions. Word has length 109 [2022-03-20 18:32:40,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:32:40,845 INFO L478 AbstractCegarLoop]: Abstraction has 116 states and 117 transitions. [2022-03-20 18:32:40,845 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 5.0476190476190474) internal successors, (106), 20 states have internal predecessors, (106), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:40,845 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 117 transitions. [2022-03-20 18:32:40,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2022-03-20 18:32:40,846 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:32:40,846 INFO L499 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:32:40,864 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-20 18:32:41,063 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-20 18:32:41,063 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:32:41,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:32:41,064 INFO L85 PathProgramCache]: Analyzing trace with hash -1780956950, now seen corresponding path program 33 times [2022-03-20 18:32:41,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:32:41,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [222678940] [2022-03-20 18:32:41,064 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:32:41,065 INFO L85 PathProgramCache]: Analyzing trace with hash -1780956950, now seen corresponding path program 34 times [2022-03-20 18:32:41,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:32:41,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593544935] [2022-03-20 18:32:41,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:32:41,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:32:41,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:32:41,377 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:32:41,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:32:41,381 INFO L134 CoverageAnalysis]: Checked inductivity of 901 backedges. 34 proven. 867 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:41,381 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:32:41,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593544935] [2022-03-20 18:32:41,381 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [593544935] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:32:41,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [887341602] [2022-03-20 18:32:41,381 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:32:41,381 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:32:41,381 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:32:41,391 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:32:41,393 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-20 18:32:41,696 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:32:41,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:32:41,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 931 conjuncts, 39 conjunts are in the unsatisfiable core [2022-03-20 18:32:41,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:32:42,041 INFO L134 CoverageAnalysis]: Checked inductivity of 901 backedges. 34 proven. 867 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:42,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:32:42,739 INFO L134 CoverageAnalysis]: Checked inductivity of 901 backedges. 34 proven. 867 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:42,739 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [887341602] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:32:42,739 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:32:42,739 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 42 [2022-03-20 18:32:42,740 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:32:42,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [222678940] [2022-03-20 18:32:42,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [222678940] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:32:42,740 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:32:42,740 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-20 18:32:42,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771013569] [2022-03-20 18:32:42,740 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:32:42,740 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-20 18:32:42,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:32:42,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-20 18:32:42,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=1314, Unknown=0, NotChecked=0, Total=1722 [2022-03-20 18:32:42,741 INFO L87 Difference]: Start difference. First operand 116 states and 117 transitions. Second operand has 22 states, 22 states have (on average 5.090909090909091) internal successors, (112), 21 states have internal predecessors, (112), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:43,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:32:43,627 INFO L93 Difference]: Finished difference Result 136 states and 139 transitions. [2022-03-20 18:32:43,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-20 18:32:43,627 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 5.090909090909091) internal successors, (112), 21 states have internal predecessors, (112), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 115 [2022-03-20 18:32:43,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:32:43,628 INFO L225 Difference]: With dead ends: 136 [2022-03-20 18:32:43,628 INFO L226 Difference]: Without dead ends: 126 [2022-03-20 18:32:43,629 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 211 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=853, Invalid=2929, Unknown=0, NotChecked=0, Total=3782 [2022-03-20 18:32:43,629 INFO L913 BasicCegarLoop]: 46 mSDtfsCounter, 65 mSDsluCounter, 763 mSDsCounter, 0 mSdLazyCounter, 1449 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 809 SdHoareTripleChecker+Invalid, 1487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 1449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:32:43,630 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 809 Invalid, 1487 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 1449 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 18:32:43,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-03-20 18:32:43,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 122. [2022-03-20 18:32:43,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 118 states have (on average 1.0169491525423728) internal successors, (120), 118 states have internal predecessors, (120), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:43,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 123 transitions. [2022-03-20 18:32:43,646 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 123 transitions. Word has length 115 [2022-03-20 18:32:43,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:32:43,646 INFO L478 AbstractCegarLoop]: Abstraction has 122 states and 123 transitions. [2022-03-20 18:32:43,646 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 5.090909090909091) internal successors, (112), 21 states have internal predecessors, (112), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 18:32:43,646 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 123 transitions. [2022-03-20 18:32:43,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-03-20 18:32:43,647 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:32:43,647 INFO L499 BasicCegarLoop]: trace histogram [19, 19, 19, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:32:43,665 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-03-20 18:32:43,865 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:32:43,865 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:32:43,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:32:43,866 INFO L85 PathProgramCache]: Analyzing trace with hash -853006094, now seen corresponding path program 35 times [2022-03-20 18:32:43,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:32:43,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [766367344] [2022-03-20 18:32:43,866 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:32:43,866 INFO L85 PathProgramCache]: Analyzing trace with hash -853006094, now seen corresponding path program 36 times [2022-03-20 18:32:43,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:32:43,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882682582] [2022-03-20 18:32:43,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:32:43,867 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:32:43,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:32:44,201 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:32:44,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:32:44,205 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 36 proven. 972 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:32:44,205 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:32:44,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882682582] [2022-03-20 18:32:44,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882682582] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:32:44,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1194117811] [2022-03-20 18:32:44,205 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:32:44,205 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:32:44,206 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:32:44,215 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:32:44,216 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-20 18:32:44,702 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-03-20 18:32:44,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:32:44,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-20 18:32:44,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:32:44,965 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-03-20 18:32:44,965 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 23