/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/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_2-1-simple.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 12:47:12,982 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 12:47:12,984 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 12:47:13,020 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 12:47:13,069 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 12:47:13,070 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 12:47:13,071 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 12:47:13,072 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-03-20 12:47:13,083 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 12:47:13,084 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 12:47:13,086 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 12:47:13,086 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-20 12:47:13,086 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 12:47:13,086 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-20 12:47:13,086 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 12:47:13,086 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 12:47:13,086 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 12:47:13,087 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 12:47:13,087 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-20 12:47:13,087 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 12:47:13,088 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 12:47:13,088 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 12:47:13,088 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 12:47:13,088 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 12:47:13,088 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 12:47:13,088 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 12:47:13,088 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 12:47:13,088 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 12:47:13,089 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 12:47:13,089 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 12:47:13,089 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 12:47:13,089 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 12:47:13,089 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-03-20 12:47:13,089 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 12:47:13,342 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 12:47:13,368 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 12:47:13,370 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 12:47:13,371 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 12:47:13,372 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 12:47:13,373 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_2-1-simple.i [2022-03-20 12:47:13,431 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/72c2a1b61/c6e61c1b3d5848b9b579a07be554993f/FLAG198c67849 [2022-03-20 12:47:13,831 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 12:47:13,831 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_2-1-simple.i [2022-03-20 12:47:13,838 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/72c2a1b61/c6e61c1b3d5848b9b579a07be554993f/FLAG198c67849 [2022-03-20 12:47:13,848 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/72c2a1b61/c6e61c1b3d5848b9b579a07be554993f [2022-03-20 12:47:13,850 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 12:47:13,851 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 12:47:13,854 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 12:47:13,854 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 12:47:13,857 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 12:47:13,858 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 12:47:13" (1/1) ... [2022-03-20 12:47:13,859 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@61762a30 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:47:13, skipping insertion in model container [2022-03-20 12:47:13,859 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 12:47:13" (1/1) ... [2022-03-20 12:47:13,866 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 12:47:13,879 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 12:47:14,060 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-acceleration/array_2-1-simple.i[809,822] [2022-03-20 12:47:14,079 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 12:47:14,085 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 12:47:14,095 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-acceleration/array_2-1-simple.i[809,822] [2022-03-20 12:47:14,104 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 12:47:14,117 INFO L208 MainTranslator]: Completed translation [2022-03-20 12:47:14,118 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:47:14 WrapperNode [2022-03-20 12:47:14,118 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 12:47:14,119 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 12:47:14,119 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 12:47:14,119 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 12:47:14,127 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:47:14" (1/1) ... [2022-03-20 12:47:14,127 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:47:14" (1/1) ... [2022-03-20 12:47:14,134 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:47:14" (1/1) ... [2022-03-20 12:47:14,135 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:47:14" (1/1) ... [2022-03-20 12:47:14,149 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:47:14" (1/1) ... [2022-03-20 12:47:14,152 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:47:14" (1/1) ... [2022-03-20 12:47:14,154 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:47:14" (1/1) ... [2022-03-20 12:47:14,159 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 12:47:14,160 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 12:47:14,160 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 12:47:14,160 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 12:47:14,161 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:47:14" (1/1) ... [2022-03-20 12:47:14,166 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 12:47:14,174 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:14,188 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 12:47:14,203 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 12:47:14,232 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 12:47:14,232 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 12:47:14,233 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 12:47:14,233 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 12:47:14,233 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 12:47:14,233 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 12:47:14,233 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 12:47:14,233 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-03-20 12:47:14,234 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-03-20 12:47:14,234 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 12:47:14,234 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 12:47:14,235 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 12:47:14,235 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 12:47:14,235 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-03-20 12:47:14,236 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2022-03-20 12:47:14,236 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 12:47:14,236 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 12:47:14,236 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 12:47:14,236 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 12:47:14,236 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 12:47:14,236 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 12:47:14,316 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 12:47:14,318 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 12:47:14,473 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 12:47:14,478 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 12:47:14,479 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-20 12:47:14,485 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 12:47:14 BoogieIcfgContainer [2022-03-20 12:47:14,485 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 12:47:14,486 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 12:47:14,486 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 12:47:14,502 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 12:47:14,502 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 12:47:13" (1/3) ... [2022-03-20 12:47:14,503 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43504f38 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 12:47:14, skipping insertion in model container [2022-03-20 12:47:14,503 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 12:47:14" (2/3) ... [2022-03-20 12:47:14,503 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43504f38 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 12:47:14, skipping insertion in model container [2022-03-20 12:47:14,503 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 12:47:14" (3/3) ... [2022-03-20 12:47:14,504 INFO L111 eAbstractionObserver]: Analyzing ICFG array_2-1-simple.i [2022-03-20 12:47:14,508 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 12:47:14,508 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 12:47:14,577 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 12:47:14,585 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 12:47:14,585 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 12:47:14,600 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-20 12:47:14,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-03-20 12:47:14,609 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:14,610 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:14,611 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:14,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:14,615 INFO L85 PathProgramCache]: Analyzing trace with hash -445681932, now seen corresponding path program 1 times [2022-03-20 12:47:14,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:14,623 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [603498481] [2022-03-20 12:47:14,633 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 12:47:14,633 INFO L85 PathProgramCache]: Analyzing trace with hash -445681932, now seen corresponding path program 2 times [2022-03-20 12:47:14,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:14,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442672498] [2022-03-20 12:47:14,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:14,637 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:14,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:14,822 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:14,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:14,837 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 12:47:14,837 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:14,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442672498] [2022-03-20 12:47:14,838 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [442672498] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:14,838 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:14,838 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 12:47:14,843 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:14,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [603498481] [2022-03-20 12:47:14,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [603498481] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:14,844 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:14,845 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 12:47:14,845 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733624182] [2022-03-20 12:47:14,847 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:14,850 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 12:47:14,851 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:14,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 12:47:14,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 12:47:14,880 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:14,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:14,927 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2022-03-20 12:47:14,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 12:47:14,930 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-03-20 12:47:14,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:14,935 INFO L225 Difference]: With dead ends: 34 [2022-03-20 12:47:14,935 INFO L226 Difference]: Without dead ends: 14 [2022-03-20 12:47:14,938 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 12:47:14,942 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 12 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:14,944 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 23 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:47:14,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-03-20 12:47:14,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-03-20 12:47:14,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:14,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2022-03-20 12:47:14,979 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2022-03-20 12:47:14,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:14,980 INFO L478 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2022-03-20 12:47:14,980 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:14,980 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2022-03-20 12:47:14,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-03-20 12:47:14,981 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:14,982 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:14,982 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 12:47:14,982 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:14,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:14,983 INFO L85 PathProgramCache]: Analyzing trace with hash -617456838, now seen corresponding path program 1 times [2022-03-20 12:47:14,983 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:14,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [884118606] [2022-03-20 12:47:14,985 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 12:47:14,985 INFO L85 PathProgramCache]: Analyzing trace with hash -617456838, now seen corresponding path program 2 times [2022-03-20 12:47:14,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:14,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [481493482] [2022-03-20 12:47:14,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:14,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:15,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:15,068 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:15,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:15,085 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 12:47:15,085 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:15,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [481493482] [2022-03-20 12:47:15,085 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [481493482] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:15,085 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:15,086 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 12:47:15,086 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:15,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [884118606] [2022-03-20 12:47:15,086 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [884118606] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:15,086 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:15,086 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 12:47:15,086 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631048031] [2022-03-20 12:47:15,087 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:15,087 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 12:47:15,087 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:15,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 12:47:15,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 12:47:15,088 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:15,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:15,132 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2022-03-20 12:47:15,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 12:47:15,134 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-03-20 12:47:15,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:15,137 INFO L225 Difference]: With dead ends: 22 [2022-03-20 12:47:15,137 INFO L226 Difference]: Without dead ends: 16 [2022-03-20 12:47:15,141 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-20 12:47:15,142 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 10 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:15,143 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 19 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:47:15,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-03-20 12:47:15,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2022-03-20 12:47:15,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:15,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2022-03-20 12:47:15,147 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2022-03-20 12:47:15,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:15,147 INFO L478 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2022-03-20 12:47:15,148 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:15,148 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2022-03-20 12:47:15,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-03-20 12:47:15,148 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:15,148 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:15,148 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 12:47:15,149 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:15,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:15,149 INFO L85 PathProgramCache]: Analyzing trace with hash -1544621860, now seen corresponding path program 1 times [2022-03-20 12:47:15,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:15,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2061199946] [2022-03-20 12:47:15,168 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:15,168 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:15,168 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:15,169 INFO L85 PathProgramCache]: Analyzing trace with hash -1544621860, now seen corresponding path program 2 times [2022-03-20 12:47:15,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:15,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [906151341] [2022-03-20 12:47:15,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:15,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:15,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:15,252 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:15,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:15,262 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:15,262 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:15,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [906151341] [2022-03-20 12:47:15,262 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [906151341] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:15,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1949579323] [2022-03-20 12:47:15,263 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:47:15,263 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:15,263 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:15,265 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 12:47:15,266 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 12:47:15,317 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:47:15,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:15,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2022-03-20 12:47:15,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:15,374 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:15,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:15,417 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:15,417 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1949579323] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:15,417 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:15,418 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2022-03-20 12:47:15,418 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:15,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2061199946] [2022-03-20 12:47:15,418 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2061199946] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:15,419 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:15,419 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 12:47:15,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415564207] [2022-03-20 12:47:15,419 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:15,419 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 12:47:15,419 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:15,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 12:47:15,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2022-03-20 12:47:15,420 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:15,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:15,457 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2022-03-20 12:47:15,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 12:47:15,457 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), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-03-20 12:47:15,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:15,458 INFO L225 Difference]: With dead ends: 24 [2022-03-20 12:47:15,458 INFO L226 Difference]: Without dead ends: 18 [2022-03-20 12:47:15,458 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2022-03-20 12:47:15,459 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 12 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:15,460 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 24 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:47:15,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-03-20 12:47:15,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2022-03-20 12:47:15,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:15,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2022-03-20 12:47:15,464 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2022-03-20 12:47:15,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:15,464 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2022-03-20 12:47:15,464 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), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:15,464 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2022-03-20 12:47:15,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-20 12:47:15,465 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:15,465 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:15,495 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 12:47:15,675 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 12:47:15,676 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:15,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:15,676 INFO L85 PathProgramCache]: Analyzing trace with hash 802989566, now seen corresponding path program 3 times [2022-03-20 12:47:15,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:15,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [729073097] [2022-03-20 12:47:15,679 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:15,679 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:15,679 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:15,679 INFO L85 PathProgramCache]: Analyzing trace with hash 802989566, now seen corresponding path program 4 times [2022-03-20 12:47:15,679 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:15,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508759867] [2022-03-20 12:47:15,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:15,680 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:15,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:15,770 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:15,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:15,782 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:15,782 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:15,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508759867] [2022-03-20 12:47:15,783 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [508759867] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:15,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394312325] [2022-03-20 12:47:15,784 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:47:15,784 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:15,784 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:15,785 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 12:47:15,787 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 12:47:15,845 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:47:15,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:15,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-20 12:47:15,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:15,901 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:15,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:15,994 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:15,994 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [394312325] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:15,994 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:15,995 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 10 [2022-03-20 12:47:15,995 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:15,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [729073097] [2022-03-20 12:47:15,995 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [729073097] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:15,995 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:15,996 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 12:47:15,996 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322636989] [2022-03-20 12:47:15,996 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:15,996 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 12:47:15,996 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:15,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 12:47:15,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2022-03-20 12:47:15,997 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:16,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:16,066 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2022-03-20 12:47:16,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 12:47:16,067 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2022-03-20 12:47:16,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:16,067 INFO L225 Difference]: With dead ends: 26 [2022-03-20 12:47:16,068 INFO L226 Difference]: Without dead ends: 20 [2022-03-20 12:47:16,068 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=90, Unknown=0, NotChecked=0, Total=156 [2022-03-20 12:47:16,069 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 14 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:16,069 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 19 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:47:16,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-03-20 12:47:16,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2022-03-20 12:47:16,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:16,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2022-03-20 12:47:16,074 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2022-03-20 12:47:16,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:16,075 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2022-03-20 12:47:16,075 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:16,075 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2022-03-20 12:47:16,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 12:47:16,075 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:16,075 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:16,101 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 12:47:16,298 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 12:47:16,299 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:16,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:16,299 INFO L85 PathProgramCache]: Analyzing trace with hash 1999739552, now seen corresponding path program 5 times [2022-03-20 12:47:16,299 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:16,300 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [219211378] [2022-03-20 12:47:16,302 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:16,302 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:16,302 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:16,302 INFO L85 PathProgramCache]: Analyzing trace with hash 1999739552, now seen corresponding path program 6 times [2022-03-20 12:47:16,302 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:16,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055577003] [2022-03-20 12:47:16,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:16,303 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:16,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:16,392 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:16,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:16,398 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:16,398 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:16,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055577003] [2022-03-20 12:47:16,398 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055577003] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:16,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [515585214] [2022-03-20 12:47:16,399 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:47:16,399 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:16,399 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:16,400 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 12:47:16,402 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 12:47:16,456 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-20 12:47:16,456 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:16,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 5 conjunts are in the unsatisfiable core [2022-03-20 12:47:16,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:16,504 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:16,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:16,580 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:16,580 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [515585214] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:16,581 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:16,581 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 12 [2022-03-20 12:47:16,581 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:16,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [219211378] [2022-03-20 12:47:16,584 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [219211378] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:16,584 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:16,584 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 12:47:16,586 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831042789] [2022-03-20 12:47:16,586 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:16,587 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 12:47:16,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:16,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 12:47:16,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2022-03-20 12:47:16,591 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:16,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:16,652 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2022-03-20 12:47:16,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 12:47:16,652 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2022-03-20 12:47:16,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:16,653 INFO L225 Difference]: With dead ends: 28 [2022-03-20 12:47:16,653 INFO L226 Difference]: Without dead ends: 22 [2022-03-20 12:47:16,654 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=102, Invalid=138, Unknown=0, NotChecked=0, Total=240 [2022-03-20 12:47:16,654 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 16 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:16,655 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 19 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:47:16,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-03-20 12:47:16,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2022-03-20 12:47:16,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:16,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2022-03-20 12:47:16,660 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2022-03-20 12:47:16,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:16,660 INFO L478 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2022-03-20 12:47:16,660 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:16,661 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2022-03-20 12:47:16,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-20 12:47:16,661 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:16,661 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:16,680 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 12:47:16,871 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 12:47:16,872 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:16,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:16,872 INFO L85 PathProgramCache]: Analyzing trace with hash 1025240770, now seen corresponding path program 7 times [2022-03-20 12:47:16,872 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:16,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2064307244] [2022-03-20 12:47:16,874 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:16,874 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:16,874 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:16,874 INFO L85 PathProgramCache]: Analyzing trace with hash 1025240770, now seen corresponding path program 8 times [2022-03-20 12:47:16,875 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:16,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [458864690] [2022-03-20 12:47:16,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:16,875 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:16,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:16,932 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:16,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:16,938 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:16,939 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:16,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [458864690] [2022-03-20 12:47:16,939 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [458864690] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:16,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [530370941] [2022-03-20 12:47:16,939 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:47:16,939 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:16,940 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:16,941 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 12:47:16,942 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 12:47:16,992 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:47:16,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:16,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-20 12:47:16,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:17,049 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:17,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:17,125 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:17,125 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [530370941] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:17,125 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:17,125 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 14 [2022-03-20 12:47:17,126 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:17,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2064307244] [2022-03-20 12:47:17,126 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2064307244] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:17,126 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:17,126 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 12:47:17,126 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090254718] [2022-03-20 12:47:17,126 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:17,126 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 12:47:17,127 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:17,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 12:47:17,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2022-03-20 12:47:17,128 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:17,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:17,189 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2022-03-20 12:47:17,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 12:47:17,189 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-03-20 12:47:17,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:17,190 INFO L225 Difference]: With dead ends: 30 [2022-03-20 12:47:17,190 INFO L226 Difference]: Without dead ends: 24 [2022-03-20 12:47:17,190 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=146, Invalid=196, Unknown=0, NotChecked=0, Total=342 [2022-03-20 12:47:17,191 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 18 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:17,191 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 24 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:47:17,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-03-20 12:47:17,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2022-03-20 12:47:17,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 18 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:17,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2022-03-20 12:47:17,196 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2022-03-20 12:47:17,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:17,197 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2022-03-20 12:47:17,197 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:17,197 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2022-03-20 12:47:17,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-20 12:47:17,197 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:17,197 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:17,220 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 12:47:17,411 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 12:47:17,411 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:17,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:17,412 INFO L85 PathProgramCache]: Analyzing trace with hash 834781796, now seen corresponding path program 9 times [2022-03-20 12:47:17,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:17,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1900970245] [2022-03-20 12:47:17,414 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:17,414 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:17,414 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:17,414 INFO L85 PathProgramCache]: Analyzing trace with hash 834781796, now seen corresponding path program 10 times [2022-03-20 12:47:17,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:17,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2086876959] [2022-03-20 12:47:17,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:17,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:17,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:17,481 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:17,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:17,485 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:17,486 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:17,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2086876959] [2022-03-20 12:47:17,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2086876959] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:17,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1882888489] [2022-03-20 12:47:17,486 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:47:17,486 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:17,487 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:17,488 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 12:47:17,489 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 12:47:17,545 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:47:17,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:17,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 12:47:17,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:17,592 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:17,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:17,685 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:17,686 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1882888489] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:17,686 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:17,686 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 16 [2022-03-20 12:47:17,686 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:17,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1900970245] [2022-03-20 12:47:17,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1900970245] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:17,689 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:17,689 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 12:47:17,689 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192621572] [2022-03-20 12:47:17,689 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:17,689 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 12:47:17,689 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:17,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 12:47:17,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2022-03-20 12:47:17,691 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:17,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:17,770 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2022-03-20 12:47:17,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 12:47:17,770 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-20 12:47:17,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:17,771 INFO L225 Difference]: With dead ends: 32 [2022-03-20 12:47:17,771 INFO L226 Difference]: Without dead ends: 26 [2022-03-20 12:47:17,772 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=198, Invalid=264, Unknown=0, NotChecked=0, Total=462 [2022-03-20 12:47:17,772 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 20 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:17,773 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 19 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:47:17,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-20 12:47:17,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2022-03-20 12:47:17,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.05) internal successors, (21), 20 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:17,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2022-03-20 12:47:17,778 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2022-03-20 12:47:17,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:17,778 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2022-03-20 12:47:17,778 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:17,779 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2022-03-20 12:47:17,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-20 12:47:17,779 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:17,779 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:17,806 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 12:47:17,995 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 12:47:17,996 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:17,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:17,996 INFO L85 PathProgramCache]: Analyzing trace with hash -1807665786, now seen corresponding path program 11 times [2022-03-20 12:47:17,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:17,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [99466171] [2022-03-20 12:47:17,998 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:17,998 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:17,998 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:17,998 INFO L85 PathProgramCache]: Analyzing trace with hash -1807665786, now seen corresponding path program 12 times [2022-03-20 12:47:17,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:17,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846226507] [2022-03-20 12:47:17,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:17,999 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:18,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:18,066 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:18,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:18,071 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:18,072 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:18,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846226507] [2022-03-20 12:47:18,072 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846226507] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:18,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [226180419] [2022-03-20 12:47:18,072 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:47:18,072 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:18,073 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:18,074 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 12:47:18,110 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 12:47:18,159 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 12:47:18,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:18,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-20 12:47:18,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:18,229 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:18,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:18,345 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:18,345 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [226180419] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:18,345 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:18,345 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 18 [2022-03-20 12:47:18,345 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:18,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [99466171] [2022-03-20 12:47:18,346 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [99466171] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:18,346 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:18,346 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 12:47:18,346 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949439203] [2022-03-20 12:47:18,346 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:18,346 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 12:47:18,347 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:18,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 12:47:18,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2022-03-20 12:47:18,348 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:18,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:18,446 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2022-03-20 12:47:18,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 12:47:18,447 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2022-03-20 12:47:18,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:18,449 INFO L225 Difference]: With dead ends: 34 [2022-03-20 12:47:18,449 INFO L226 Difference]: Without dead ends: 28 [2022-03-20 12:47:18,449 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=258, Invalid=342, Unknown=0, NotChecked=0, Total=600 [2022-03-20 12:47:18,450 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 22 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:18,451 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 29 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:47:18,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-03-20 12:47:18,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2022-03-20 12:47:18,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 22 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:18,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2022-03-20 12:47:18,462 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2022-03-20 12:47:18,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:18,462 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2022-03-20 12:47:18,462 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:18,462 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2022-03-20 12:47:18,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-20 12:47:18,463 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:18,463 INFO L499 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:18,490 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 12:47:18,686 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 12:47:18,686 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:18,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:18,687 INFO L85 PathProgramCache]: Analyzing trace with hash 1420847144, now seen corresponding path program 13 times [2022-03-20 12:47:18,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:18,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1280025782] [2022-03-20 12:47:18,688 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:18,688 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:18,689 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:18,689 INFO L85 PathProgramCache]: Analyzing trace with hash 1420847144, now seen corresponding path program 14 times [2022-03-20 12:47:18,689 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:18,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1108348677] [2022-03-20 12:47:18,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:18,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:18,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:18,783 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:18,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:18,796 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:18,796 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:18,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1108348677] [2022-03-20 12:47:18,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1108348677] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:18,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1220681103] [2022-03-20 12:47:18,797 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:47:18,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:18,797 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:18,799 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 12:47:18,827 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 12:47:18,866 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:47:18,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:18,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 12:47:18,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:18,926 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:18,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:19,057 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:19,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1220681103] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:19,058 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:19,058 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 20 [2022-03-20 12:47:19,060 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:19,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1280025782] [2022-03-20 12:47:19,061 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1280025782] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:19,061 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:19,061 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 12:47:19,061 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259874218] [2022-03-20 12:47:19,061 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:19,062 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 12:47:19,062 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:19,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 12:47:19,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2022-03-20 12:47:19,063 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:19,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:19,171 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2022-03-20 12:47:19,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 12:47:19,172 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2022-03-20 12:47:19,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:19,174 INFO L225 Difference]: With dead ends: 36 [2022-03-20 12:47:19,175 INFO L226 Difference]: Without dead ends: 30 [2022-03-20 12:47:19,175 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=326, Invalid=430, Unknown=0, NotChecked=0, Total=756 [2022-03-20 12:47:19,177 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 24 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:19,178 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 39 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:47:19,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-03-20 12:47:19,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2022-03-20 12:47:19,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 24 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:19,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2022-03-20 12:47:19,188 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2022-03-20 12:47:19,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:19,189 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2022-03-20 12:47:19,189 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:19,189 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2022-03-20 12:47:19,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 12:47:19,190 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:19,190 INFO L499 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:19,217 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-20 12:47:19,413 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 12:47:19,414 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:19,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:19,414 INFO L85 PathProgramCache]: Analyzing trace with hash -1239582134, now seen corresponding path program 15 times [2022-03-20 12:47:19,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:19,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1621403835] [2022-03-20 12:47:19,416 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:19,416 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:19,416 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:19,416 INFO L85 PathProgramCache]: Analyzing trace with hash -1239582134, now seen corresponding path program 16 times [2022-03-20 12:47:19,417 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:19,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1551691798] [2022-03-20 12:47:19,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:19,417 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:19,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:19,500 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:19,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:19,504 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:19,504 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:19,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1551691798] [2022-03-20 12:47:19,504 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1551691798] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:19,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [87520788] [2022-03-20 12:47:19,504 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:47:19,504 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:19,505 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:19,506 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 12:47:19,531 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 12:47:19,577 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:47:19,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:19,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-20 12:47:19,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:19,632 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:19,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:19,775 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:19,775 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [87520788] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:19,775 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:19,776 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 22 [2022-03-20 12:47:19,776 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:19,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1621403835] [2022-03-20 12:47:19,776 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1621403835] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:19,776 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:19,776 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 12:47:19,776 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771908246] [2022-03-20 12:47:19,776 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:19,777 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 12:47:19,777 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:19,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 12:47:19,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2022-03-20 12:47:19,778 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:19,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:19,884 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2022-03-20 12:47:19,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 12:47:19,884 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2022-03-20 12:47:19,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:19,885 INFO L225 Difference]: With dead ends: 38 [2022-03-20 12:47:19,885 INFO L226 Difference]: Without dead ends: 32 [2022-03-20 12:47:19,885 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=402, Invalid=528, Unknown=0, NotChecked=0, Total=930 [2022-03-20 12:47:19,886 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 26 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:19,886 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 24 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:47:19,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-03-20 12:47:19,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2022-03-20 12:47:19,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:19,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2022-03-20 12:47:19,891 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2022-03-20 12:47:19,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:19,891 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2022-03-20 12:47:19,891 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:19,891 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2022-03-20 12:47:19,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-20 12:47:19,892 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:19,892 INFO L499 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:19,915 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 12:47:20,115 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 12:47:20,116 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:20,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:20,116 INFO L85 PathProgramCache]: Analyzing trace with hash 1888390124, now seen corresponding path program 17 times [2022-03-20 12:47:20,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:20,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [424771740] [2022-03-20 12:47:20,118 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:20,118 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:20,118 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:20,118 INFO L85 PathProgramCache]: Analyzing trace with hash 1888390124, now seen corresponding path program 18 times [2022-03-20 12:47:20,118 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:20,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072247399] [2022-03-20 12:47:20,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:20,119 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:20,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:20,208 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:20,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:20,212 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:20,212 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:20,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072247399] [2022-03-20 12:47:20,212 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2072247399] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:20,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [708527711] [2022-03-20 12:47:20,212 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:47:20,212 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:20,213 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:20,214 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 12:47:20,244 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 12:47:20,349 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2022-03-20 12:47:20,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:20,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 12:47:20,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:20,409 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:20,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:20,605 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:20,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [708527711] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:20,606 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:20,606 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 24 [2022-03-20 12:47:20,606 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:20,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [424771740] [2022-03-20 12:47:20,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [424771740] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:20,606 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:20,606 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 12:47:20,606 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865446864] [2022-03-20 12:47:20,607 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:20,607 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 12:47:20,607 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:20,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 12:47:20,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2022-03-20 12:47:20,608 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:20,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:20,743 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2022-03-20 12:47:20,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 12:47:20,743 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2022-03-20 12:47:20,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:20,743 INFO L225 Difference]: With dead ends: 40 [2022-03-20 12:47:20,744 INFO L226 Difference]: Without dead ends: 34 [2022-03-20 12:47:20,744 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=486, Invalid=636, Unknown=0, NotChecked=0, Total=1122 [2022-03-20 12:47:20,745 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 28 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:20,745 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 29 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:47:20,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-03-20 12:47:20,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2022-03-20 12:47:20,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 28 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:20,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2022-03-20 12:47:20,750 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2022-03-20 12:47:20,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:20,751 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2022-03-20 12:47:20,751 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:20,751 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2022-03-20 12:47:20,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 12:47:20,751 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:20,752 INFO L499 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:20,777 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-20 12:47:20,963 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 12:47:20,963 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:20,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:20,964 INFO L85 PathProgramCache]: Analyzing trace with hash 1392622862, now seen corresponding path program 19 times [2022-03-20 12:47:20,964 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:20,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1584525532] [2022-03-20 12:47:20,965 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:20,965 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:20,965 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:20,965 INFO L85 PathProgramCache]: Analyzing trace with hash 1392622862, now seen corresponding path program 20 times [2022-03-20 12:47:20,965 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:20,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689075561] [2022-03-20 12:47:20,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:20,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:20,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:21,101 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:21,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:21,105 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:21,106 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:21,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689075561] [2022-03-20 12:47:21,106 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1689075561] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:21,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1884291570] [2022-03-20 12:47:21,106 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:47:21,106 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:21,107 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:21,108 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 12:47:21,142 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 12:47:21,198 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:47:21,198 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:21,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 12:47:21,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:21,276 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:21,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:21,487 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:21,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1884291570] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:21,488 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:21,488 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 26 [2022-03-20 12:47:21,488 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:21,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1584525532] [2022-03-20 12:47:21,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1584525532] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:21,488 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:21,488 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 12:47:21,488 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184239708] [2022-03-20 12:47:21,488 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:21,489 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 12:47:21,489 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:21,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 12:47:21,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2022-03-20 12:47:21,490 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:21,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:21,666 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2022-03-20 12:47:21,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 12:47:21,666 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2022-03-20 12:47:21,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:21,667 INFO L225 Difference]: With dead ends: 42 [2022-03-20 12:47:21,667 INFO L226 Difference]: Without dead ends: 36 [2022-03-20 12:47:21,668 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=578, Invalid=754, Unknown=0, NotChecked=0, Total=1332 [2022-03-20 12:47:21,668 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 30 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:21,668 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 34 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:47:21,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-03-20 12:47:21,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2022-03-20 12:47:21,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 30 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:21,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2022-03-20 12:47:21,675 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2022-03-20 12:47:21,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:21,675 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2022-03-20 12:47:21,675 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:21,675 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2022-03-20 12:47:21,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-20 12:47:21,676 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:21,676 INFO L499 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:21,703 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 12:47:21,891 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 12:47:21,891 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:21,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:21,892 INFO L85 PathProgramCache]: Analyzing trace with hash 1701653936, now seen corresponding path program 21 times [2022-03-20 12:47:21,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:21,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1728673020] [2022-03-20 12:47:21,893 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:21,893 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:21,893 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:21,894 INFO L85 PathProgramCache]: Analyzing trace with hash 1701653936, now seen corresponding path program 22 times [2022-03-20 12:47:21,894 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:21,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [101528897] [2022-03-20 12:47:21,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:21,894 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:21,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:22,029 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:22,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:22,034 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:22,034 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:22,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [101528897] [2022-03-20 12:47:22,035 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [101528897] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:22,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784976727] [2022-03-20 12:47:22,035 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:47:22,035 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:22,035 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:22,036 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 12:47:22,037 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 12:47:22,136 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:47:22,136 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:22,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-20 12:47:22,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:22,208 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:22,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:22,458 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:22,458 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784976727] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:22,459 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:22,459 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 28 [2022-03-20 12:47:22,459 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:22,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1728673020] [2022-03-20 12:47:22,459 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1728673020] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:22,459 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:22,459 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 12:47:22,459 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769034119] [2022-03-20 12:47:22,459 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:22,460 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 12:47:22,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:22,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 12:47:22,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2022-03-20 12:47:22,461 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 14 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:22,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:22,617 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2022-03-20 12:47:22,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 12:47:22,617 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 14 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2022-03-20 12:47:22,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:22,618 INFO L225 Difference]: With dead ends: 44 [2022-03-20 12:47:22,618 INFO L226 Difference]: Without dead ends: 38 [2022-03-20 12:47:22,618 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=678, Invalid=882, Unknown=0, NotChecked=0, Total=1560 [2022-03-20 12:47:22,619 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 32 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:22,619 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 19 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:47:22,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-20 12:47:22,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2022-03-20 12:47:22,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.03125) internal successors, (33), 32 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:22,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2022-03-20 12:47:22,625 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2022-03-20 12:47:22,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:22,625 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2022-03-20 12:47:22,625 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 14 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:22,625 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2022-03-20 12:47:22,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-20 12:47:22,626 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:22,626 INFO L499 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:22,653 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 12:47:22,838 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 12:47:22,838 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:22,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:22,839 INFO L85 PathProgramCache]: Analyzing trace with hash -1967194670, now seen corresponding path program 23 times [2022-03-20 12:47:22,839 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:22,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1298630156] [2022-03-20 12:47:22,840 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:22,841 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:22,841 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:22,841 INFO L85 PathProgramCache]: Analyzing trace with hash -1967194670, now seen corresponding path program 24 times [2022-03-20 12:47:22,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:22,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1983544357] [2022-03-20 12:47:22,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:22,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:22,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:22,995 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:22,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:23,002 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:23,002 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:23,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1983544357] [2022-03-20 12:47:23,003 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1983544357] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:23,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153559502] [2022-03-20 12:47:23,003 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:47:23,003 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:23,003 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:23,004 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 12:47:23,019 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 12:47:23,203 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2022-03-20 12:47:23,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:23,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-20 12:47:23,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:23,286 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:23,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:23,581 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:23,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [153559502] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:23,581 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:23,581 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 30 [2022-03-20 12:47:23,581 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:23,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1298630156] [2022-03-20 12:47:23,582 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1298630156] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:23,582 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:23,582 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 12:47:23,582 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412746887] [2022-03-20 12:47:23,582 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:23,582 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 12:47:23,582 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:23,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 12:47:23,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2022-03-20 12:47:23,583 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:23,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:23,763 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2022-03-20 12:47:23,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 12:47:23,763 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2022-03-20 12:47:23,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:23,764 INFO L225 Difference]: With dead ends: 46 [2022-03-20 12:47:23,764 INFO L226 Difference]: Without dead ends: 40 [2022-03-20 12:47:23,765 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2022-03-20 12:47:23,765 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 34 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:23,766 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 24 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:47:23,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-03-20 12:47:23,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2022-03-20 12:47:23,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 34 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:23,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2022-03-20 12:47:23,771 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2022-03-20 12:47:23,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:23,772 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2022-03-20 12:47:23,772 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:23,772 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2022-03-20 12:47:23,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 12:47:23,772 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:23,772 INFO L499 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:23,798 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-20 12:47:23,987 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 12:47:23,987 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:23,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:23,988 INFO L85 PathProgramCache]: Analyzing trace with hash -1562555020, now seen corresponding path program 25 times [2022-03-20 12:47:23,988 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:23,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [878046960] [2022-03-20 12:47:23,989 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:23,989 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:23,989 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:23,989 INFO L85 PathProgramCache]: Analyzing trace with hash -1562555020, now seen corresponding path program 26 times [2022-03-20 12:47:23,990 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:23,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1307094575] [2022-03-20 12:47:23,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:23,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:24,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:24,126 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:24,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:24,136 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:24,137 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:24,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1307094575] [2022-03-20 12:47:24,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1307094575] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:24,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355574961] [2022-03-20 12:47:24,137 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:47:24,137 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:24,138 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:24,140 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 12:47:24,149 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 12:47:24,224 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:47:24,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:24,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 15 conjunts are in the unsatisfiable core [2022-03-20 12:47:24,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:24,305 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:24,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:24,650 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:24,650 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355574961] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:24,650 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:24,650 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 32 [2022-03-20 12:47:24,651 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:24,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [878046960] [2022-03-20 12:47:24,651 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [878046960] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:24,651 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:24,651 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 12:47:24,651 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189243410] [2022-03-20 12:47:24,651 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:24,652 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 12:47:24,652 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:24,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 12:47:24,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2022-03-20 12:47:24,653 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:24,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:24,857 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2022-03-20 12:47:24,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-20 12:47:24,858 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2022-03-20 12:47:24,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:24,858 INFO L225 Difference]: With dead ends: 48 [2022-03-20 12:47:24,858 INFO L226 Difference]: Without dead ends: 42 [2022-03-20 12:47:24,859 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=902, Invalid=1168, Unknown=0, NotChecked=0, Total=2070 [2022-03-20 12:47:24,860 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 36 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:24,860 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 29 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:47:24,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-03-20 12:47:24,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2022-03-20 12:47:24,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 36 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:24,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2022-03-20 12:47:24,867 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2022-03-20 12:47:24,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:24,867 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2022-03-20 12:47:24,867 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:24,867 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2022-03-20 12:47:24,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-03-20 12:47:24,868 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:24,868 INFO L499 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:24,894 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 12:47:25,092 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 12:47:25,092 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:25,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:25,093 INFO L85 PathProgramCache]: Analyzing trace with hash 749091990, now seen corresponding path program 27 times [2022-03-20 12:47:25,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:25,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1364111218] [2022-03-20 12:47:25,094 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:25,094 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:25,094 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:25,095 INFO L85 PathProgramCache]: Analyzing trace with hash 749091990, now seen corresponding path program 28 times [2022-03-20 12:47:25,095 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:25,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111636584] [2022-03-20 12:47:25,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:25,095 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:25,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:25,253 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:25,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:25,257 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:25,257 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:25,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111636584] [2022-03-20 12:47:25,257 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2111636584] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:25,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [420798706] [2022-03-20 12:47:25,257 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:47:25,257 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:25,258 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:25,259 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 12:47:25,260 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 12:47:25,337 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:47:25,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:25,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 12:47:25,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:25,423 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:25,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:25,746 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:25,747 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [420798706] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:25,747 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:25,747 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 34 [2022-03-20 12:47:25,747 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:25,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1364111218] [2022-03-20 12:47:25,747 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1364111218] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:25,747 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:25,748 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 12:47:25,748 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044556306] [2022-03-20 12:47:25,748 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:25,748 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 12:47:25,748 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:25,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 12:47:25,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2022-03-20 12:47:25,749 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:25,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:25,963 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2022-03-20 12:47:25,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 12:47:25,964 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2022-03-20 12:47:25,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:25,964 INFO L225 Difference]: With dead ends: 50 [2022-03-20 12:47:25,964 INFO L226 Difference]: Without dead ends: 44 [2022-03-20 12:47:25,965 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=1026, Invalid=1326, Unknown=0, NotChecked=0, Total=2352 [2022-03-20 12:47:25,966 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 38 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:25,966 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 29 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:47:25,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-20 12:47:25,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-03-20 12:47:25,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 38 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:25,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2022-03-20 12:47:25,972 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2022-03-20 12:47:25,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:25,972 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2022-03-20 12:47:25,972 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:25,972 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2022-03-20 12:47:25,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 12:47:25,973 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:25,973 INFO L499 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:25,999 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-20 12:47:26,187 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 12:47:26,187 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:26,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:26,188 INFO L85 PathProgramCache]: Analyzing trace with hash 1743776568, now seen corresponding path program 29 times [2022-03-20 12:47:26,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:26,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1891307995] [2022-03-20 12:47:26,189 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:26,190 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:26,190 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:26,190 INFO L85 PathProgramCache]: Analyzing trace with hash 1743776568, now seen corresponding path program 30 times [2022-03-20 12:47:26,190 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:26,190 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454662310] [2022-03-20 12:47:26,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:26,190 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:26,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:26,373 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:26,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:26,388 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:26,388 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:26,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454662310] [2022-03-20 12:47:26,389 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1454662310] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:26,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [115080782] [2022-03-20 12:47:26,389 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:47:26,389 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:26,389 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:26,392 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 12:47:26,398 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 12:47:26,719 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2022-03-20 12:47:26,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:26,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 17 conjunts are in the unsatisfiable core [2022-03-20 12:47:26,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:26,808 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:26,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:27,201 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:27,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [115080782] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:27,202 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:27,202 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 36 [2022-03-20 12:47:27,202 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:27,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1891307995] [2022-03-20 12:47:27,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1891307995] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:27,202 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:27,202 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 12:47:27,202 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697129854] [2022-03-20 12:47:27,202 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:27,203 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 12:47:27,203 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:27,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 12:47:27,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2022-03-20 12:47:27,204 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand has 19 states, 19 states have (on average 2.0) internal successors, (38), 18 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:27,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:27,441 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2022-03-20 12:47:27,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 12:47:27,441 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.0) internal successors, (38), 18 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2022-03-20 12:47:27,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:27,442 INFO L225 Difference]: With dead ends: 52 [2022-03-20 12:47:27,442 INFO L226 Difference]: Without dead ends: 46 [2022-03-20 12:47:27,443 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1158, Invalid=1494, Unknown=0, NotChecked=0, Total=2652 [2022-03-20 12:47:27,444 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 40 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:27,444 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 34 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:47:27,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-03-20 12:47:27,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2022-03-20 12:47:27,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.025) internal successors, (41), 40 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:27,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2022-03-20 12:47:27,451 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2022-03-20 12:47:27,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:27,452 INFO L478 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2022-03-20 12:47:27,452 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.0) internal successors, (38), 18 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:27,452 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2022-03-20 12:47:27,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-20 12:47:27,453 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:27,453 INFO L499 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:27,483 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 12:47:27,679 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 12:47:27,679 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:27,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:27,680 INFO L85 PathProgramCache]: Analyzing trace with hash -142050982, now seen corresponding path program 31 times [2022-03-20 12:47:27,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:27,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [55246183] [2022-03-20 12:47:27,681 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:27,681 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:27,681 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:27,681 INFO L85 PathProgramCache]: Analyzing trace with hash -142050982, now seen corresponding path program 32 times [2022-03-20 12:47:27,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:27,681 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411710797] [2022-03-20 12:47:27,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:27,682 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:27,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:27,842 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:27,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:27,846 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:27,846 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:27,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411710797] [2022-03-20 12:47:27,846 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [411710797] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:27,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [991480901] [2022-03-20 12:47:27,846 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:47:27,847 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:27,847 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:27,851 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 12:47:27,852 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 12:47:27,933 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:47:27,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:27,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 18 conjunts are in the unsatisfiable core [2022-03-20 12:47:27,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:28,031 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:28,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:28,470 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:28,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [991480901] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:28,470 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:28,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 38 [2022-03-20 12:47:28,470 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:28,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [55246183] [2022-03-20 12:47:28,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [55246183] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:28,471 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:28,471 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 12:47:28,471 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408427792] [2022-03-20 12:47:28,471 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:28,471 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 12:47:28,471 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:28,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 12:47:28,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 12:47:28,472 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:28,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:28,718 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2022-03-20 12:47:28,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-20 12:47:28,719 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2022-03-20 12:47:28,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:28,719 INFO L225 Difference]: With dead ends: 54 [2022-03-20 12:47:28,720 INFO L226 Difference]: Without dead ends: 48 [2022-03-20 12:47:28,721 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=1298, Invalid=1672, Unknown=0, NotChecked=0, Total=2970 [2022-03-20 12:47:28,721 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 42 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:28,721 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 39 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:47:28,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-20 12:47:28,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2022-03-20 12:47:28,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 42 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:28,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2022-03-20 12:47:28,735 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2022-03-20 12:47:28,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:28,735 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2022-03-20 12:47:28,735 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:28,735 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2022-03-20 12:47:28,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-20 12:47:28,736 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:28,736 INFO L499 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:28,759 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 12:47:28,936 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 12:47:28,936 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:28,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:28,937 INFO L85 PathProgramCache]: Analyzing trace with hash 53872380, now seen corresponding path program 33 times [2022-03-20 12:47:28,937 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:28,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [997568173] [2022-03-20 12:47:28,938 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:28,938 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:28,938 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:28,939 INFO L85 PathProgramCache]: Analyzing trace with hash 53872380, now seen corresponding path program 34 times [2022-03-20 12:47:28,939 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:28,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [324233746] [2022-03-20 12:47:28,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:28,939 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:28,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:29,167 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:29,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:29,170 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:29,170 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:29,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [324233746] [2022-03-20 12:47:29,171 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [324233746] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:29,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1210676933] [2022-03-20 12:47:29,171 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:47:29,171 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:29,171 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:29,176 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 12:47:29,204 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 12:47:29,284 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:47:29,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:29,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-20 12:47:29,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:29,367 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:29,367 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:29,761 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:29,762 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1210676933] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:29,762 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:29,762 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 40 [2022-03-20 12:47:29,762 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:29,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [997568173] [2022-03-20 12:47:29,763 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [997568173] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:29,763 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:29,763 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-20 12:47:29,763 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184850269] [2022-03-20 12:47:29,763 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:29,763 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-20 12:47:29,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:29,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-20 12:47:29,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2022-03-20 12:47:29,764 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:30,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:30,030 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2022-03-20 12:47:30,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-20 12:47:30,030 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2022-03-20 12:47:30,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:30,031 INFO L225 Difference]: With dead ends: 56 [2022-03-20 12:47:30,031 INFO L226 Difference]: Without dead ends: 50 [2022-03-20 12:47:30,032 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 254 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1446, Invalid=1860, Unknown=0, NotChecked=0, Total=3306 [2022-03-20 12:47:30,032 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 44 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:30,033 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 29 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:47:30,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-03-20 12:47:30,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2022-03-20 12:47:30,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0227272727272727) internal successors, (45), 44 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:30,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2022-03-20 12:47:30,039 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2022-03-20 12:47:30,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:30,039 INFO L478 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2022-03-20 12:47:30,040 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:30,040 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2022-03-20 12:47:30,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-20 12:47:30,040 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:30,040 INFO L499 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:30,057 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-20 12:47:30,241 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 12:47:30,241 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:30,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:30,241 INFO L85 PathProgramCache]: Analyzing trace with hash -642337762, now seen corresponding path program 35 times [2022-03-20 12:47:30,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:30,241 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1232654796] [2022-03-20 12:47:30,242 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:30,243 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:30,243 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:30,243 INFO L85 PathProgramCache]: Analyzing trace with hash -642337762, now seen corresponding path program 36 times [2022-03-20 12:47:30,243 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:30,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [376203223] [2022-03-20 12:47:30,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:30,243 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:30,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:30,445 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:30,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:30,455 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:30,455 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:30,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [376203223] [2022-03-20 12:47:30,456 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [376203223] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:30,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991130457] [2022-03-20 12:47:30,456 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:47:30,456 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:30,456 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:30,457 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 12:47:30,458 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 12:47:30,753 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2022-03-20 12:47:30,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:30,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-20 12:47:30,757 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:30,861 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:30,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:31,383 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:31,383 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1991130457] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:31,383 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:31,383 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 42 [2022-03-20 12:47:31,383 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:31,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1232654796] [2022-03-20 12:47:31,384 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1232654796] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:31,384 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:31,384 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-20 12:47:31,384 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372902529] [2022-03-20 12:47:31,384 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:31,384 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-20 12:47:31,384 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:31,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-20 12:47:31,385 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2022-03-20 12:47:31,385 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:31,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:31,642 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2022-03-20 12:47:31,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-20 12:47:31,643 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 48 [2022-03-20 12:47:31,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:31,644 INFO L225 Difference]: With dead ends: 58 [2022-03-20 12:47:31,644 INFO L226 Difference]: Without dead ends: 52 [2022-03-20 12:47:31,645 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1602, Invalid=2058, Unknown=0, NotChecked=0, Total=3660 [2022-03-20 12:47:31,646 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 46 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:31,646 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 29 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:47:31,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-03-20 12:47:31,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2022-03-20 12:47:31,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.0217391304347827) internal successors, (47), 46 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:31,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2022-03-20 12:47:31,652 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2022-03-20 12:47:31,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:31,653 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2022-03-20 12:47:31,653 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:31,653 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2022-03-20 12:47:31,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-20 12:47:31,653 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:31,653 INFO L499 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:31,678 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-03-20 12:47:31,878 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:31,878 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:31,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:31,879 INFO L85 PathProgramCache]: Analyzing trace with hash 314613952, now seen corresponding path program 37 times [2022-03-20 12:47:31,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:31,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [523083828] [2022-03-20 12:47:31,880 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:31,880 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:31,880 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:31,881 INFO L85 PathProgramCache]: Analyzing trace with hash 314613952, now seen corresponding path program 38 times [2022-03-20 12:47:31,881 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:31,881 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [23213190] [2022-03-20 12:47:31,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:31,881 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:31,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:32,083 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:32,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:32,088 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:32,088 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:32,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [23213190] [2022-03-20 12:47:32,088 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [23213190] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:32,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1736579116] [2022-03-20 12:47:32,088 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:47:32,088 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:32,088 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:32,089 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:47:32,090 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-20 12:47:32,188 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:47:32,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:32,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-20 12:47:32,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:32,285 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:32,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:32,753 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:32,753 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1736579116] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:32,753 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:32,753 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 44 [2022-03-20 12:47:32,754 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:32,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [523083828] [2022-03-20 12:47:32,754 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [523083828] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:32,754 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:32,754 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-20 12:47:32,754 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452788263] [2022-03-20 12:47:32,754 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:32,754 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-20 12:47:32,754 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:32,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-20 12:47:32,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2022-03-20 12:47:32,756 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:33,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:33,053 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2022-03-20 12:47:33,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 12:47:33,053 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2022-03-20 12:47:33,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:33,054 INFO L225 Difference]: With dead ends: 60 [2022-03-20 12:47:33,066 INFO L226 Difference]: Without dead ends: 54 [2022-03-20 12:47:33,067 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 303 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1766, Invalid=2266, Unknown=0, NotChecked=0, Total=4032 [2022-03-20 12:47:33,067 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 48 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:33,067 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 39 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:47:33,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-20 12:47:33,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2022-03-20 12:47:33,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0208333333333333) internal successors, (49), 48 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:33,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2022-03-20 12:47:33,073 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2022-03-20 12:47:33,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:33,073 INFO L478 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2022-03-20 12:47:33,073 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:33,073 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2022-03-20 12:47:33,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-03-20 12:47:33,074 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:33,074 INFO L499 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:33,092 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-20 12:47:33,278 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:33,278 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:33,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:33,278 INFO L85 PathProgramCache]: Analyzing trace with hash 822209762, now seen corresponding path program 39 times [2022-03-20 12:47:33,278 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:33,278 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1265349669] [2022-03-20 12:47:33,280 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:33,280 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:33,280 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:33,280 INFO L85 PathProgramCache]: Analyzing trace with hash 822209762, now seen corresponding path program 40 times [2022-03-20 12:47:33,280 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:33,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425835931] [2022-03-20 12:47:33,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:33,280 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:33,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:33,547 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:33,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:33,551 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:33,551 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:33,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425835931] [2022-03-20 12:47:33,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [425835931] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:33,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [119753003] [2022-03-20 12:47:33,551 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:47:33,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:33,552 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:33,556 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:47:33,564 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-20 12:47:33,684 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:47:33,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:33,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-20 12:47:33,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:33,794 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:33,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:34,359 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:34,359 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [119753003] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:34,360 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:34,360 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 46 [2022-03-20 12:47:34,360 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:34,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1265349669] [2022-03-20 12:47:34,360 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1265349669] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:34,360 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:34,360 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-20 12:47:34,360 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685510909] [2022-03-20 12:47:34,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:34,361 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-20 12:47:34,361 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:34,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-20 12:47:34,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2022-03-20 12:47:34,362 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand has 24 states, 24 states have (on average 2.0) internal successors, (48), 23 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:34,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:34,645 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2022-03-20 12:47:34,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-20 12:47:34,647 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0) internal successors, (48), 23 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 52 [2022-03-20 12:47:34,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:34,647 INFO L225 Difference]: With dead ends: 62 [2022-03-20 12:47:34,647 INFO L226 Difference]: Without dead ends: 56 [2022-03-20 12:47:34,649 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1938, Invalid=2484, Unknown=0, NotChecked=0, Total=4422 [2022-03-20 12:47:34,649 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 50 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:34,649 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 44 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:47:34,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-03-20 12:47:34,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2022-03-20 12:47:34,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.02) internal successors, (51), 50 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:34,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2022-03-20 12:47:34,656 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2022-03-20 12:47:34,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:34,656 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2022-03-20 12:47:34,656 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.0) internal successors, (48), 23 states have internal predecessors, (48), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:34,657 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2022-03-20 12:47:34,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-03-20 12:47:34,657 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:34,657 INFO L499 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:34,674 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-03-20 12:47:34,859 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-03-20 12:47:34,859 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:34,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:34,860 INFO L85 PathProgramCache]: Analyzing trace with hash -1004488572, now seen corresponding path program 41 times [2022-03-20 12:47:34,860 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:34,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1990379196] [2022-03-20 12:47:34,861 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:34,861 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:34,861 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:34,861 INFO L85 PathProgramCache]: Analyzing trace with hash -1004488572, now seen corresponding path program 42 times [2022-03-20 12:47:34,861 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:34,861 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500840121] [2022-03-20 12:47:34,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:34,861 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:34,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:35,111 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:35,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:35,119 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:35,119 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:35,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1500840121] [2022-03-20 12:47:35,119 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1500840121] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:35,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [937912256] [2022-03-20 12:47:35,120 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:47:35,120 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:35,120 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:35,121 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:47:35,122 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-20 12:47:35,843 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2022-03-20 12:47:35,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:35,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 23 conjunts are in the unsatisfiable core [2022-03-20 12:47:35,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:35,946 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:35,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:36,511 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:36,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [937912256] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:36,511 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:36,511 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 48 [2022-03-20 12:47:36,512 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:36,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1990379196] [2022-03-20 12:47:36,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1990379196] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:36,512 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:36,512 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-03-20 12:47:36,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23848273] [2022-03-20 12:47:36,512 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:36,512 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-03-20 12:47:36,512 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:36,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-03-20 12:47:36,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2022-03-20 12:47:36,513 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand has 25 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:36,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:36,799 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2022-03-20 12:47:36,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-03-20 12:47:36,800 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2022-03-20 12:47:36,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:36,800 INFO L225 Difference]: With dead ends: 64 [2022-03-20 12:47:36,800 INFO L226 Difference]: Without dead ends: 58 [2022-03-20 12:47:36,801 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 356 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=2118, Invalid=2712, Unknown=0, NotChecked=0, Total=4830 [2022-03-20 12:47:36,802 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 52 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:36,802 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 29 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 12:47:36,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-03-20 12:47:36,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2022-03-20 12:47:36,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.0192307692307692) internal successors, (53), 52 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:36,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2022-03-20 12:47:36,810 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2022-03-20 12:47:36,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:36,810 INFO L478 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2022-03-20 12:47:36,810 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:36,810 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2022-03-20 12:47:36,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-03-20 12:47:36,810 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:36,811 INFO L499 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:36,832 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-03-20 12:47:37,023 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-03-20 12:47:37,023 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:37,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:37,024 INFO L85 PathProgramCache]: Analyzing trace with hash 180036518, now seen corresponding path program 43 times [2022-03-20 12:47:37,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:37,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [732894412] [2022-03-20 12:47:37,025 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:37,025 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:37,025 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:37,025 INFO L85 PathProgramCache]: Analyzing trace with hash 180036518, now seen corresponding path program 44 times [2022-03-20 12:47:37,025 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:37,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1891054222] [2022-03-20 12:47:37,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:37,026 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:37,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:37,305 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:37,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:37,309 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:37,309 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:37,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1891054222] [2022-03-20 12:47:37,309 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1891054222] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:37,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336655294] [2022-03-20 12:47:37,309 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:47:37,309 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:37,309 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:37,312 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:47:37,339 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-20 12:47:37,451 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:47:37,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:37,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-20 12:47:37,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:37,582 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:37,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:38,178 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:38,179 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1336655294] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:38,179 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:38,179 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 50 [2022-03-20 12:47:38,179 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:38,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [732894412] [2022-03-20 12:47:38,179 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [732894412] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:38,179 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:38,179 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-20 12:47:38,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920974010] [2022-03-20 12:47:38,179 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:38,180 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-20 12:47:38,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:38,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-20 12:47:38,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2022-03-20 12:47:38,181 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:38,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:38,509 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2022-03-20 12:47:38,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-20 12:47:38,509 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2022-03-20 12:47:38,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:38,510 INFO L225 Difference]: With dead ends: 66 [2022-03-20 12:47:38,510 INFO L226 Difference]: Without dead ends: 60 [2022-03-20 12:47:38,511 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 384 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=2306, Invalid=2950, Unknown=0, NotChecked=0, Total=5256 [2022-03-20 12:47:38,512 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 54 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:38,512 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 34 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:47:38,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-03-20 12:47:38,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2022-03-20 12:47:38,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0185185185185186) internal successors, (55), 54 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:38,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2022-03-20 12:47:38,517 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2022-03-20 12:47:38,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:38,518 INFO L478 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2022-03-20 12:47:38,518 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:38,518 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2022-03-20 12:47:38,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-03-20 12:47:38,518 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:38,518 INFO L499 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:38,535 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-03-20 12:47:38,720 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:38,721 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:38,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:38,721 INFO L85 PathProgramCache]: Analyzing trace with hash 342314568, now seen corresponding path program 45 times [2022-03-20 12:47:38,721 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:38,721 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [103368928] [2022-03-20 12:47:38,722 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:38,722 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:38,722 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:38,723 INFO L85 PathProgramCache]: Analyzing trace with hash 342314568, now seen corresponding path program 46 times [2022-03-20 12:47:38,723 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:38,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740341935] [2022-03-20 12:47:38,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:38,723 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:38,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:39,021 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:39,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:39,024 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:39,024 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:39,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740341935] [2022-03-20 12:47:39,024 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [740341935] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:39,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859828946] [2022-03-20 12:47:39,024 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:47:39,025 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:39,025 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:39,026 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:47:39,027 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-20 12:47:39,147 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:47:39,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:39,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-20 12:47:39,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:39,252 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:39,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:39,907 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:39,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [859828946] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:39,907 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:39,907 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 52 [2022-03-20 12:47:39,907 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:39,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [103368928] [2022-03-20 12:47:39,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [103368928] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:39,908 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:39,908 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-03-20 12:47:39,908 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536349538] [2022-03-20 12:47:39,908 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:39,908 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-03-20 12:47:39,908 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:39,909 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-03-20 12:47:39,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2022-03-20 12:47:39,909 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand has 27 states, 27 states have (on average 2.0) internal successors, (54), 26 states have internal predecessors, (54), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:40,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:40,236 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2022-03-20 12:47:40,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-03-20 12:47:40,237 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.0) internal successors, (54), 26 states have internal predecessors, (54), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 58 [2022-03-20 12:47:40,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:40,237 INFO L225 Difference]: With dead ends: 68 [2022-03-20 12:47:40,237 INFO L226 Difference]: Without dead ends: 62 [2022-03-20 12:47:40,238 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 413 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=2502, Invalid=3198, Unknown=0, NotChecked=0, Total=5700 [2022-03-20 12:47:40,239 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 56 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:40,239 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 39 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:47:40,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-03-20 12:47:40,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2022-03-20 12:47:40,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0178571428571428) internal successors, (57), 56 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:40,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2022-03-20 12:47:40,245 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2022-03-20 12:47:40,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:40,246 INFO L478 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2022-03-20 12:47:40,246 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.0) internal successors, (54), 26 states have internal predecessors, (54), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:40,246 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2022-03-20 12:47:40,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-03-20 12:47:40,246 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:40,246 INFO L499 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:40,266 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-03-20 12:47:40,456 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:40,456 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:40,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:40,456 INFO L85 PathProgramCache]: Analyzing trace with hash 1672697962, now seen corresponding path program 47 times [2022-03-20 12:47:40,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:40,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1170650668] [2022-03-20 12:47:40,458 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:40,458 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:40,458 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:40,458 INFO L85 PathProgramCache]: Analyzing trace with hash 1672697962, now seen corresponding path program 48 times [2022-03-20 12:47:40,458 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:40,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [929381876] [2022-03-20 12:47:40,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:40,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:40,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:40,724 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:40,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:40,726 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:40,727 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:40,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [929381876] [2022-03-20 12:47:40,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [929381876] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:40,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772021384] [2022-03-20 12:47:40,727 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:47:40,727 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:40,727 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:40,728 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:47:40,729 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-20 12:47:42,282 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2022-03-20 12:47:42,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:42,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 26 conjunts are in the unsatisfiable core [2022-03-20 12:47:42,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:42,424 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:42,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:43,103 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:43,103 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1772021384] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:43,103 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:43,103 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 54 [2022-03-20 12:47:43,103 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:43,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1170650668] [2022-03-20 12:47:43,103 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1170650668] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:43,103 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:43,103 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-03-20 12:47:43,104 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595889668] [2022-03-20 12:47:43,104 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:43,104 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-03-20 12:47:43,104 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:43,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-03-20 12:47:43,105 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2022-03-20 12:47:43,105 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand has 28 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:43,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:43,460 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2022-03-20 12:47:43,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-20 12:47:43,460 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 60 [2022-03-20 12:47:43,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:43,461 INFO L225 Difference]: With dead ends: 70 [2022-03-20 12:47:43,461 INFO L226 Difference]: Without dead ends: 64 [2022-03-20 12:47:43,462 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=2706, Invalid=3456, Unknown=0, NotChecked=0, Total=6162 [2022-03-20 12:47:43,462 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 58 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:43,462 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 19 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:47:43,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-03-20 12:47:43,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2022-03-20 12:47:43,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0172413793103448) internal successors, (59), 58 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:43,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2022-03-20 12:47:43,469 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2022-03-20 12:47:43,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:43,469 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2022-03-20 12:47:43,469 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:43,469 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2022-03-20 12:47:43,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-03-20 12:47:43,470 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:43,470 INFO L499 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:43,489 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-03-20 12:47:43,671 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-03-20 12:47:43,671 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:43,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:43,671 INFO L85 PathProgramCache]: Analyzing trace with hash 270885388, now seen corresponding path program 49 times [2022-03-20 12:47:43,671 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:43,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [199749907] [2022-03-20 12:47:43,673 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:43,673 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:43,673 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:43,673 INFO L85 PathProgramCache]: Analyzing trace with hash 270885388, now seen corresponding path program 50 times [2022-03-20 12:47:43,673 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:43,673 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59075082] [2022-03-20 12:47:43,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:43,673 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:43,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:43,981 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:43,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:43,989 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:43,989 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:43,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59075082] [2022-03-20 12:47:43,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59075082] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:43,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [732236933] [2022-03-20 12:47:43,989 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:47:43,989 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:43,989 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:43,990 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:47:43,991 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-20 12:47:44,119 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:47:44,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:44,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-20 12:47:44,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:44,236 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:44,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:44,962 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:44,963 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [732236933] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:44,963 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:44,963 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 56 [2022-03-20 12:47:44,963 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:44,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [199749907] [2022-03-20 12:47:44,963 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [199749907] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:44,963 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:44,964 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-20 12:47:44,964 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839222653] [2022-03-20 12:47:44,964 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:44,964 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-20 12:47:44,964 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:44,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-20 12:47:44,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2022-03-20 12:47:44,965 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:45,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:45,357 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2022-03-20 12:47:45,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-20 12:47:45,357 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2022-03-20 12:47:45,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:45,357 INFO L225 Difference]: With dead ends: 72 [2022-03-20 12:47:45,357 INFO L226 Difference]: Without dead ends: 66 [2022-03-20 12:47:45,358 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 474 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=2918, Invalid=3724, Unknown=0, NotChecked=0, Total=6642 [2022-03-20 12:47:45,359 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 60 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:45,359 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 34 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:47:45,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-03-20 12:47:45,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2022-03-20 12:47:45,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.0166666666666666) internal successors, (61), 60 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:45,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2022-03-20 12:47:45,366 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2022-03-20 12:47:45,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:45,367 INFO L478 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2022-03-20 12:47:45,367 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:45,367 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2022-03-20 12:47:45,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-03-20 12:47:45,367 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:45,367 INFO L499 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:45,385 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-03-20 12:47:45,568 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-03-20 12:47:45,568 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:45,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:45,568 INFO L85 PathProgramCache]: Analyzing trace with hash 1748732718, now seen corresponding path program 51 times [2022-03-20 12:47:45,569 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:45,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [236572949] [2022-03-20 12:47:45,570 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:45,570 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:45,570 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:45,570 INFO L85 PathProgramCache]: Analyzing trace with hash 1748732718, now seen corresponding path program 52 times [2022-03-20 12:47:45,570 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:45,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141093137] [2022-03-20 12:47:45,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:45,570 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:45,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:45,925 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:45,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:45,928 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:45,928 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:45,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141093137] [2022-03-20 12:47:45,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141093137] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:45,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [676852370] [2022-03-20 12:47:45,929 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:47:45,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:45,929 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:45,930 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:47:45,931 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-20 12:47:46,064 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:47:46,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:46,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 12:47:46,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:46,174 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:46,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:46,952 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:46,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [676852370] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:46,952 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:46,952 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 58 [2022-03-20 12:47:46,952 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:46,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [236572949] [2022-03-20 12:47:46,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [236572949] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:46,953 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:46,953 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-20 12:47:46,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697759031] [2022-03-20 12:47:46,953 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:46,953 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-20 12:47:46,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:46,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-20 12:47:46,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2022-03-20 12:47:46,954 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:47,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:47,388 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2022-03-20 12:47:47,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-03-20 12:47:47,388 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 64 [2022-03-20 12:47:47,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:47,389 INFO L225 Difference]: With dead ends: 74 [2022-03-20 12:47:47,389 INFO L226 Difference]: Without dead ends: 68 [2022-03-20 12:47:47,390 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=3138, Invalid=4002, Unknown=0, NotChecked=0, Total=7140 [2022-03-20 12:47:47,391 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 62 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:47,391 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 39 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:47:47,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-03-20 12:47:47,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2022-03-20 12:47:47,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0161290322580645) internal successors, (63), 62 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:47,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2022-03-20 12:47:47,400 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2022-03-20 12:47:47,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:47,400 INFO L478 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2022-03-20 12:47:47,401 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 states have internal predecessors, (60), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:47,401 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2022-03-20 12:47:47,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-03-20 12:47:47,401 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:47,401 INFO L499 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:47,419 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-03-20 12:47:47,607 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-03-20 12:47:47,607 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:47,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:47,608 INFO L85 PathProgramCache]: Analyzing trace with hash 325841872, now seen corresponding path program 53 times [2022-03-20 12:47:47,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:47,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1641876496] [2022-03-20 12:47:47,609 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:47,609 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:47,609 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:47,609 INFO L85 PathProgramCache]: Analyzing trace with hash 325841872, now seen corresponding path program 54 times [2022-03-20 12:47:47,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:47,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [718348966] [2022-03-20 12:47:47,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:47,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:47,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:48,020 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:48,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:48,024 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:48,024 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:48,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [718348966] [2022-03-20 12:47:48,024 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [718348966] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:48,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1115660511] [2022-03-20 12:47:48,024 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:47:48,024 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:48,024 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:48,028 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:47:48,055 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-20 12:47:50,119 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 28 check-sat command(s) [2022-03-20 12:47:50,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:50,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-20 12:47:50,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:50,241 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:50,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:51,053 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:51,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1115660511] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:51,053 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:51,053 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 60 [2022-03-20 12:47:51,053 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:51,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1641876496] [2022-03-20 12:47:51,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1641876496] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:51,054 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:51,054 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-03-20 12:47:51,054 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794455913] [2022-03-20 12:47:51,054 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:51,054 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-03-20 12:47:51,054 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:51,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-03-20 12:47:51,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2022-03-20 12:47:51,056 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand has 31 states, 31 states have (on average 2.0) internal successors, (62), 30 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:51,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:51,477 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2022-03-20 12:47:51,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-03-20 12:47:51,477 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.0) internal successors, (62), 30 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 66 [2022-03-20 12:47:51,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:51,478 INFO L225 Difference]: With dead ends: 76 [2022-03-20 12:47:51,478 INFO L226 Difference]: Without dead ends: 70 [2022-03-20 12:47:51,478 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=3366, Invalid=4290, Unknown=0, NotChecked=0, Total=7656 [2022-03-20 12:47:51,479 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 64 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:51,479 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 34 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:47:51,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-03-20 12:47:51,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2022-03-20 12:47:51,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.015625) internal successors, (65), 64 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:51,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2022-03-20 12:47:51,489 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2022-03-20 12:47:51,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:51,489 INFO L478 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2022-03-20 12:47:51,489 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.0) internal successors, (62), 30 states have internal predecessors, (62), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:51,490 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2022-03-20 12:47:51,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-03-20 12:47:51,490 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:51,490 INFO L499 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:51,516 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-03-20 12:47:51,708 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-03-20 12:47:51,709 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:51,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:51,709 INFO L85 PathProgramCache]: Analyzing trace with hash -1272661006, now seen corresponding path program 55 times [2022-03-20 12:47:51,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:51,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2025345717] [2022-03-20 12:47:51,710 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:51,710 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:51,710 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:51,711 INFO L85 PathProgramCache]: Analyzing trace with hash -1272661006, now seen corresponding path program 56 times [2022-03-20 12:47:51,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:51,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1838139686] [2022-03-20 12:47:51,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:51,711 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:51,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:52,074 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:52,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:52,077 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:52,077 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:52,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1838139686] [2022-03-20 12:47:52,077 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1838139686] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:52,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [19606781] [2022-03-20 12:47:52,077 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:47:52,077 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:52,077 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:52,078 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:47:52,080 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-20 12:47:52,219 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:47:52,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:52,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 30 conjunts are in the unsatisfiable core [2022-03-20 12:47:52,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:52,330 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:52,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:53,218 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:53,219 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [19606781] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:53,219 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:53,219 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 62 [2022-03-20 12:47:53,219 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:53,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2025345717] [2022-03-20 12:47:53,219 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2025345717] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:53,219 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:53,220 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-03-20 12:47:53,220 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664591242] [2022-03-20 12:47:53,220 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:53,220 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-03-20 12:47:53,220 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:53,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-03-20 12:47:53,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1832, Invalid=1950, Unknown=0, NotChecked=0, Total=3782 [2022-03-20 12:47:53,221 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:53,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:53,703 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2022-03-20 12:47:53,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-03-20 12:47:53,704 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 68 [2022-03-20 12:47:53,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:53,704 INFO L225 Difference]: With dead ends: 78 [2022-03-20 12:47:53,704 INFO L226 Difference]: Without dead ends: 72 [2022-03-20 12:47:53,705 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 573 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=3602, Invalid=4588, Unknown=0, NotChecked=0, Total=8190 [2022-03-20 12:47:53,705 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 66 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:53,706 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 34 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:47:53,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-03-20 12:47:53,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2022-03-20 12:47:53,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0151515151515151) internal successors, (67), 66 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:53,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2022-03-20 12:47:53,714 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2022-03-20 12:47:53,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:53,714 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2022-03-20 12:47:53,714 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:53,714 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2022-03-20 12:47:53,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-03-20 12:47:53,715 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:53,715 INFO L499 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:53,731 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-03-20 12:47:53,915 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:53,915 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:53,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:53,916 INFO L85 PathProgramCache]: Analyzing trace with hash 164365204, now seen corresponding path program 57 times [2022-03-20 12:47:53,916 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:53,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1024483965] [2022-03-20 12:47:53,917 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:53,917 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:53,917 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:53,917 INFO L85 PathProgramCache]: Analyzing trace with hash 164365204, now seen corresponding path program 58 times [2022-03-20 12:47:53,917 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:53,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [63679399] [2022-03-20 12:47:53,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:53,918 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:53,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:54,367 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:54,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:54,370 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:54,370 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:54,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [63679399] [2022-03-20 12:47:54,371 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [63679399] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:54,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1368203582] [2022-03-20 12:47:54,371 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:47:54,371 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:54,371 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:54,376 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:47:54,377 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-20 12:47:54,574 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:47:54,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:47:54,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-20 12:47:54,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:47:54,689 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:54,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:47:55,649 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:55,649 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1368203582] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:47:55,649 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:47:55,649 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 64 [2022-03-20 12:47:55,649 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:47:55,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1024483965] [2022-03-20 12:47:55,650 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1024483965] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:47:55,650 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:47:55,650 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-03-20 12:47:55,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199056573] [2022-03-20 12:47:55,650 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:47:55,650 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-03-20 12:47:55,650 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:55,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-03-20 12:47:55,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1955, Invalid=2077, Unknown=0, NotChecked=0, Total=4032 [2022-03-20 12:47:55,651 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand has 33 states, 33 states have (on average 2.0) internal successors, (66), 32 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:56,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:47:56,165 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2022-03-20 12:47:56,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-03-20 12:47:56,166 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.0) internal successors, (66), 32 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 70 [2022-03-20 12:47:56,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:47:56,166 INFO L225 Difference]: With dead ends: 80 [2022-03-20 12:47:56,166 INFO L226 Difference]: Without dead ends: 74 [2022-03-20 12:47:56,167 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 608 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=3846, Invalid=4896, Unknown=0, NotChecked=0, Total=8742 [2022-03-20 12:47:56,168 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 68 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:47:56,168 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 34 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:47:56,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-03-20 12:47:56,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2022-03-20 12:47:56,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.0147058823529411) internal successors, (69), 68 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:56,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2022-03-20 12:47:56,179 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2022-03-20 12:47:56,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:47:56,179 INFO L478 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2022-03-20 12:47:56,179 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.0) internal successors, (66), 32 states have internal predecessors, (66), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:47:56,179 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2022-03-20 12:47:56,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-03-20 12:47:56,180 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:47:56,180 INFO L499 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:47:56,197 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-03-20 12:47:56,383 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:56,383 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:47:56,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:47:56,384 INFO L85 PathProgramCache]: Analyzing trace with hash -1832916298, now seen corresponding path program 59 times [2022-03-20 12:47:56,384 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:47:56,384 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1926204368] [2022-03-20 12:47:56,385 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:47:56,385 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:47:56,385 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:47:56,386 INFO L85 PathProgramCache]: Analyzing trace with hash -1832916298, now seen corresponding path program 60 times [2022-03-20 12:47:56,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:47:56,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [19996125] [2022-03-20 12:47:56,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:47:56,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:47:56,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:56,846 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:47:56,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:47:56,850 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:47:56,850 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:47:56,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [19996125] [2022-03-20 12:47:56,850 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [19996125] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:47:56,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [156297123] [2022-03-20 12:47:56,850 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:47:56,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:47:56,851 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:47:56,856 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:47:56,882 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-03-20 12:48:00,999 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2022-03-20 12:48:00,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:48:01,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-20 12:48:01,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:48:01,131 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:01,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:48:02,126 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:02,127 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [156297123] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:48:02,127 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:48:02,127 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 66 [2022-03-20 12:48:02,127 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:48:02,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1926204368] [2022-03-20 12:48:02,127 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1926204368] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:48:02,127 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:48:02,127 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-03-20 12:48:02,127 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461128363] [2022-03-20 12:48:02,128 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:48:02,128 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-03-20 12:48:02,128 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:02,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-03-20 12:48:02,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2082, Invalid=2208, Unknown=0, NotChecked=0, Total=4290 [2022-03-20 12:48:02,129 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:02,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:48:02,695 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2022-03-20 12:48:02,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-03-20 12:48:02,695 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 72 [2022-03-20 12:48:02,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:48:02,695 INFO L225 Difference]: With dead ends: 82 [2022-03-20 12:48:02,696 INFO L226 Difference]: Without dead ends: 76 [2022-03-20 12:48:02,696 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 644 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=4098, Invalid=5214, Unknown=0, NotChecked=0, Total=9312 [2022-03-20 12:48:02,696 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 70 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:48:02,697 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 29 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:48:02,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-03-20 12:48:02,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2022-03-20 12:48:02,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.0142857142857142) internal successors, (71), 70 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:02,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2022-03-20 12:48:02,709 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2022-03-20 12:48:02,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:48:02,709 INFO L478 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2022-03-20 12:48:02,709 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:02,709 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2022-03-20 12:48:02,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-03-20 12:48:02,710 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:48:02,710 INFO L499 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:48:02,732 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-03-20 12:48:02,919 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-03-20 12:48:02,919 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:48:02,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:48:02,920 INFO L85 PathProgramCache]: Analyzing trace with hash -1370058408, now seen corresponding path program 61 times [2022-03-20 12:48:02,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:02,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1157522337] [2022-03-20 12:48:02,921 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:48:02,922 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:48:02,922 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:48:02,922 INFO L85 PathProgramCache]: Analyzing trace with hash -1370058408, now seen corresponding path program 62 times [2022-03-20 12:48:02,922 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:48:02,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [829030881] [2022-03-20 12:48:02,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:48:02,922 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:48:02,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:03,379 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:48:03,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:03,382 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:03,383 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:48:03,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [829030881] [2022-03-20 12:48:03,383 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [829030881] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:48:03,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [771281398] [2022-03-20 12:48:03,383 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:48:03,383 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:48:03,383 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:48:03,385 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:48:03,386 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-03-20 12:48:03,549 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:48:03,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:48:03,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-20 12:48:03,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:48:03,694 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:03,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:48:04,778 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:04,778 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [771281398] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:48:04,778 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:48:04,778 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 68 [2022-03-20 12:48:04,778 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:48:04,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1157522337] [2022-03-20 12:48:04,778 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1157522337] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:48:04,779 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:48:04,779 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-03-20 12:48:04,779 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687578302] [2022-03-20 12:48:04,779 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:48:04,779 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-03-20 12:48:04,779 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:04,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-03-20 12:48:04,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2213, Invalid=2343, Unknown=0, NotChecked=0, Total=4556 [2022-03-20 12:48:04,780 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:05,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:48:05,328 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2022-03-20 12:48:05,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-03-20 12:48:05,329 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2022-03-20 12:48:05,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:48:05,329 INFO L225 Difference]: With dead ends: 84 [2022-03-20 12:48:05,329 INFO L226 Difference]: Without dead ends: 78 [2022-03-20 12:48:05,330 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 681 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=4358, Invalid=5542, Unknown=0, NotChecked=0, Total=9900 [2022-03-20 12:48:05,331 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 72 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:48:05,331 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 49 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:48:05,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-03-20 12:48:05,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2022-03-20 12:48:05,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0138888888888888) internal successors, (73), 72 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:05,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2022-03-20 12:48:05,339 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2022-03-20 12:48:05,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:48:05,339 INFO L478 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2022-03-20 12:48:05,340 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:05,340 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2022-03-20 12:48:05,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-03-20 12:48:05,340 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:48:05,340 INFO L499 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:48:05,358 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2022-03-20 12:48:05,540 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:48:05,541 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:48:05,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:48:05,541 INFO L85 PathProgramCache]: Analyzing trace with hash 1054742394, now seen corresponding path program 63 times [2022-03-20 12:48:05,541 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:05,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1845541136] [2022-03-20 12:48:05,543 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:48:05,543 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:48:05,543 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:48:05,543 INFO L85 PathProgramCache]: Analyzing trace with hash 1054742394, now seen corresponding path program 64 times [2022-03-20 12:48:05,543 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:48:05,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1151977305] [2022-03-20 12:48:05,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:48:05,543 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:48:05,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:06,058 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:48:06,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:06,061 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:06,062 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:48:06,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1151977305] [2022-03-20 12:48:06,062 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1151977305] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:48:06,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [817719786] [2022-03-20 12:48:06,062 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:48:06,062 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:48:06,062 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:48:06,063 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:48:06,091 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-03-20 12:48:06,274 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:48:06,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:48:06,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-20 12:48:06,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:48:06,412 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:06,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:48:07,594 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:07,595 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [817719786] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:48:07,595 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:48:07,595 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 70 [2022-03-20 12:48:07,595 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:48:07,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1845541136] [2022-03-20 12:48:07,595 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1845541136] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:48:07,595 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:48:07,595 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-03-20 12:48:07,595 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656337546] [2022-03-20 12:48:07,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:48:07,595 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-03-20 12:48:07,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:07,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-03-20 12:48:07,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2348, Invalid=2482, Unknown=0, NotChecked=0, Total=4830 [2022-03-20 12:48:07,597 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand has 36 states, 36 states have (on average 2.0) internal successors, (72), 35 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:08,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:48:08,184 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2022-03-20 12:48:08,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-03-20 12:48:08,185 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.0) internal successors, (72), 35 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 76 [2022-03-20 12:48:08,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:48:08,185 INFO L225 Difference]: With dead ends: 86 [2022-03-20 12:48:08,185 INFO L226 Difference]: Without dead ends: 80 [2022-03-20 12:48:08,186 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 719 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=4626, Invalid=5880, Unknown=0, NotChecked=0, Total=10506 [2022-03-20 12:48:08,186 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 74 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:48:08,187 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 49 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:48:08,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-03-20 12:48:08,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2022-03-20 12:48:08,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0135135135135136) internal successors, (75), 74 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:08,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2022-03-20 12:48:08,196 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2022-03-20 12:48:08,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:48:08,196 INFO L478 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2022-03-20 12:48:08,196 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.0) internal successors, (72), 35 states have internal predecessors, (72), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:08,196 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2022-03-20 12:48:08,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-03-20 12:48:08,196 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:48:08,197 INFO L499 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:48:08,215 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-03-20 12:48:08,400 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:48:08,400 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:48:08,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:48:08,400 INFO L85 PathProgramCache]: Analyzing trace with hash -878928612, now seen corresponding path program 65 times [2022-03-20 12:48:08,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:08,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1494614592] [2022-03-20 12:48:08,402 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:48:08,402 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:48:08,402 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:48:08,403 INFO L85 PathProgramCache]: Analyzing trace with hash -878928612, now seen corresponding path program 66 times [2022-03-20 12:48:08,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:48:08,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1808087665] [2022-03-20 12:48:08,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:48:08,403 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:48:08,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:08,907 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:48:08,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:08,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:08,911 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:48:08,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1808087665] [2022-03-20 12:48:08,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1808087665] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:48:08,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1370137538] [2022-03-20 12:48:08,911 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:48:08,911 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:48:08,911 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:48:08,912 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:48:08,913 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-03-20 12:48:13,189 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 34 check-sat command(s) [2022-03-20 12:48:13,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:48:13,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-20 12:48:13,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:48:13,330 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:13,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:48:14,523 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:14,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1370137538] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:48:14,524 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:48:14,524 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 36] total 72 [2022-03-20 12:48:14,524 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:48:14,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1494614592] [2022-03-20 12:48:14,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1494614592] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:48:14,524 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:48:14,524 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-03-20 12:48:14,524 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035359612] [2022-03-20 12:48:14,524 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:48:14,525 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-03-20 12:48:14,525 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:14,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-03-20 12:48:14,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2487, Invalid=2625, Unknown=0, NotChecked=0, Total=5112 [2022-03-20 12:48:14,526 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand has 37 states, 37 states have (on average 2.0) internal successors, (74), 36 states have internal predecessors, (74), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:15,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:48:15,123 INFO L93 Difference]: Finished difference Result 88 states and 88 transitions. [2022-03-20 12:48:15,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-03-20 12:48:15,123 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.0) internal successors, (74), 36 states have internal predecessors, (74), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 78 [2022-03-20 12:48:15,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:48:15,124 INFO L225 Difference]: With dead ends: 88 [2022-03-20 12:48:15,124 INFO L226 Difference]: Without dead ends: 82 [2022-03-20 12:48:15,125 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 758 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=4902, Invalid=6228, Unknown=0, NotChecked=0, Total=11130 [2022-03-20 12:48:15,125 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 76 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:48:15,125 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 34 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:48:15,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-03-20 12:48:15,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2022-03-20 12:48:15,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.013157894736842) internal successors, (77), 76 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:15,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2022-03-20 12:48:15,136 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2022-03-20 12:48:15,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:48:15,136 INFO L478 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2022-03-20 12:48:15,136 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.0) internal successors, (74), 36 states have internal predecessors, (74), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:15,136 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2022-03-20 12:48:15,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-03-20 12:48:15,137 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:48:15,137 INFO L499 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:48:15,160 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2022-03-20 12:48:15,342 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-03-20 12:48:15,343 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:48:15,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:48:15,343 INFO L85 PathProgramCache]: Analyzing trace with hash 584073790, now seen corresponding path program 67 times [2022-03-20 12:48:15,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:15,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1032291098] [2022-03-20 12:48:15,345 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:48:15,345 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:48:15,345 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:48:15,345 INFO L85 PathProgramCache]: Analyzing trace with hash 584073790, now seen corresponding path program 68 times [2022-03-20 12:48:15,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:48:15,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1863127375] [2022-03-20 12:48:15,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:48:15,345 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:48:15,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:15,842 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:48:15,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:15,844 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:15,844 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:48:15,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1863127375] [2022-03-20 12:48:15,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1863127375] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:48:15,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [150378198] [2022-03-20 12:48:15,845 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:48:15,845 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:48:15,845 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:48:15,846 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:48:15,847 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-03-20 12:48:16,040 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:48:16,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:48:16,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 392 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-20 12:48:16,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:48:16,172 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:16,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:48:17,435 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:17,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [150378198] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:48:17,435 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:48:17,435 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 74 [2022-03-20 12:48:17,435 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:48:17,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1032291098] [2022-03-20 12:48:17,436 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1032291098] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:48:17,436 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:48:17,436 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-03-20 12:48:17,436 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183663553] [2022-03-20 12:48:17,436 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:48:17,436 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-03-20 12:48:17,436 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:17,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-03-20 12:48:17,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2630, Invalid=2772, Unknown=0, NotChecked=0, Total=5402 [2022-03-20 12:48:17,437 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:18,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:48:18,081 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2022-03-20 12:48:18,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-03-20 12:48:18,082 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2022-03-20 12:48:18,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:48:18,082 INFO L225 Difference]: With dead ends: 90 [2022-03-20 12:48:18,082 INFO L226 Difference]: Without dead ends: 84 [2022-03-20 12:48:18,083 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 798 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=5186, Invalid=6586, Unknown=0, NotChecked=0, Total=11772 [2022-03-20 12:48:18,084 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 78 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:48:18,084 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 34 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:48:18,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-03-20 12:48:18,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2022-03-20 12:48:18,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0128205128205128) internal successors, (79), 78 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:18,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2022-03-20 12:48:18,094 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2022-03-20 12:48:18,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:48:18,094 INFO L478 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2022-03-20 12:48:18,094 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:18,094 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2022-03-20 12:48:18,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-03-20 12:48:18,094 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:48:18,095 INFO L499 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:48:18,116 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2022-03-20 12:48:18,305 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-03-20 12:48:18,305 INFO L403 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:48:18,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:48:18,305 INFO L85 PathProgramCache]: Analyzing trace with hash 2075076320, now seen corresponding path program 69 times [2022-03-20 12:48:18,306 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:18,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [76320955] [2022-03-20 12:48:18,307 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:48:18,308 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:48:18,308 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:48:18,308 INFO L85 PathProgramCache]: Analyzing trace with hash 2075076320, now seen corresponding path program 70 times [2022-03-20 12:48:18,308 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:48:18,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135873348] [2022-03-20 12:48:18,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:48:18,308 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:48:18,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:18,842 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:48:18,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:18,845 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:18,845 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:48:18,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135873348] [2022-03-20 12:48:18,846 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1135873348] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:48:18,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1923943462] [2022-03-20 12:48:18,846 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:48:18,846 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:48:18,846 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:48:18,848 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:48:18,848 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-03-20 12:48:19,047 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:48:19,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:48:19,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 37 conjunts are in the unsatisfiable core [2022-03-20 12:48:19,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:48:19,198 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:19,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:48:20,537 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:20,537 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1923943462] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:48:20,537 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:48:20,537 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 76 [2022-03-20 12:48:20,537 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:48:20,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [76320955] [2022-03-20 12:48:20,538 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [76320955] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:48:20,538 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:48:20,538 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-03-20 12:48:20,538 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950505661] [2022-03-20 12:48:20,538 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:48:20,538 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-03-20 12:48:20,538 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:20,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-03-20 12:48:20,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2777, Invalid=2923, Unknown=0, NotChecked=0, Total=5700 [2022-03-20 12:48:20,540 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand has 39 states, 39 states have (on average 2.0) internal successors, (78), 38 states have internal predecessors, (78), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:21,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:48:21,215 INFO L93 Difference]: Finished difference Result 92 states and 92 transitions. [2022-03-20 12:48:21,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-03-20 12:48:21,215 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.0) internal successors, (78), 38 states have internal predecessors, (78), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 82 [2022-03-20 12:48:21,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:48:21,216 INFO L225 Difference]: With dead ends: 92 [2022-03-20 12:48:21,216 INFO L226 Difference]: Without dead ends: 86 [2022-03-20 12:48:21,217 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 839 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=5478, Invalid=6954, Unknown=0, NotChecked=0, Total=12432 [2022-03-20 12:48:21,217 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 80 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:48:21,217 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 34 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:48:21,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-03-20 12:48:21,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2022-03-20 12:48:21,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0125) internal successors, (81), 80 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:21,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2022-03-20 12:48:21,229 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2022-03-20 12:48:21,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:48:21,229 INFO L478 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2022-03-20 12:48:21,229 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.0) internal successors, (78), 38 states have internal predecessors, (78), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:21,229 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2022-03-20 12:48:21,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-03-20 12:48:21,230 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:48:21,230 INFO L499 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:48:21,247 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-03-20 12:48:21,430 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-03-20 12:48:21,430 INFO L403 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:48:21,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:48:21,431 INFO L85 PathProgramCache]: Analyzing trace with hash 409430786, now seen corresponding path program 71 times [2022-03-20 12:48:21,431 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:21,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [904187858] [2022-03-20 12:48:21,433 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:48:21,433 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:48:21,433 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:48:21,433 INFO L85 PathProgramCache]: Analyzing trace with hash 409430786, now seen corresponding path program 72 times [2022-03-20 12:48:21,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:48:21,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [407643451] [2022-03-20 12:48:21,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:48:21,433 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:48:21,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:21,964 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:48:21,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:21,968 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:21,969 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:48:21,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [407643451] [2022-03-20 12:48:21,969 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [407643451] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:48:21,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855839471] [2022-03-20 12:48:21,969 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:48:21,969 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:48:21,969 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:48:21,972 INFO L229 MonitoredProcess]: Starting monitored process 37 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:48:21,977 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-03-20 12:48:30,003 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 37 check-sat command(s) [2022-03-20 12:48:30,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:48:30,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 410 conjuncts, 38 conjunts are in the unsatisfiable core [2022-03-20 12:48:30,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:48:30,171 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:30,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:48:31,563 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:31,563 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1855839471] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:48:31,563 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:48:31,563 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 78 [2022-03-20 12:48:31,563 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:48:31,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [904187858] [2022-03-20 12:48:31,563 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [904187858] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:48:31,563 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:48:31,563 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-03-20 12:48:31,564 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383253906] [2022-03-20 12:48:31,564 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:48:31,564 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-03-20 12:48:31,564 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:31,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-03-20 12:48:31,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2928, Invalid=3078, Unknown=0, NotChecked=0, Total=6006 [2022-03-20 12:48:31,565 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand has 40 states, 40 states have (on average 2.0) internal successors, (80), 39 states have internal predecessors, (80), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:32,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:48:32,226 INFO L93 Difference]: Finished difference Result 94 states and 94 transitions. [2022-03-20 12:48:32,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-03-20 12:48:32,227 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.0) internal successors, (80), 39 states have internal predecessors, (80), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 84 [2022-03-20 12:48:32,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:48:32,227 INFO L225 Difference]: With dead ends: 94 [2022-03-20 12:48:32,227 INFO L226 Difference]: Without dead ends: 88 [2022-03-20 12:48:32,229 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 881 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=5778, Invalid=7332, Unknown=0, NotChecked=0, Total=13110 [2022-03-20 12:48:32,230 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 82 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:48:32,230 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 34 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:48:32,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-03-20 12:48:32,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2022-03-20 12:48:32,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0121951219512195) internal successors, (83), 82 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:32,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2022-03-20 12:48:32,250 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2022-03-20 12:48:32,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:48:32,250 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2022-03-20 12:48:32,250 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.0) internal successors, (80), 39 states have internal predecessors, (80), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:32,250 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2022-03-20 12:48:32,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-03-20 12:48:32,251 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:48:32,251 INFO L499 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:48:32,275 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-03-20 12:48:32,453 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,37 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:48:32,454 INFO L403 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:48:32,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:48:32,454 INFO L85 PathProgramCache]: Analyzing trace with hash 1746874020, now seen corresponding path program 73 times [2022-03-20 12:48:32,454 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:32,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [174229299] [2022-03-20 12:48:32,456 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:48:32,456 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:48:32,456 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:48:32,456 INFO L85 PathProgramCache]: Analyzing trace with hash 1746874020, now seen corresponding path program 74 times [2022-03-20 12:48:32,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:48:32,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41002907] [2022-03-20 12:48:32,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:48:32,457 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:48:32,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:32,996 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:48:32,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:33,006 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:33,007 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:48:33,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41002907] [2022-03-20 12:48:33,007 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [41002907] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:48:33,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1699673408] [2022-03-20 12:48:33,007 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:48:33,007 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:48:33,007 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:48:33,008 INFO L229 MonitoredProcess]: Starting monitored process 38 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:48:33,009 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-03-20 12:48:33,210 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:48:33,210 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:48:33,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 39 conjunts are in the unsatisfiable core [2022-03-20 12:48:33,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:48:33,357 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:33,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:48:34,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:34,821 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1699673408] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:48:34,821 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:48:34,821 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 40] total 80 [2022-03-20 12:48:34,821 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:48:34,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [174229299] [2022-03-20 12:48:34,821 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [174229299] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:48:34,821 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:48:34,821 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-03-20 12:48:34,822 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413957023] [2022-03-20 12:48:34,822 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:48:34,822 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-03-20 12:48:34,822 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:34,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-03-20 12:48:34,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3083, Invalid=3237, Unknown=0, NotChecked=0, Total=6320 [2022-03-20 12:48:34,823 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:35,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:48:35,554 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2022-03-20 12:48:35,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-03-20 12:48:35,554 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2022-03-20 12:48:35,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:48:35,555 INFO L225 Difference]: With dead ends: 96 [2022-03-20 12:48:35,555 INFO L226 Difference]: Without dead ends: 90 [2022-03-20 12:48:35,557 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 924 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=6086, Invalid=7720, Unknown=0, NotChecked=0, Total=13806 [2022-03-20 12:48:35,558 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 84 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:48:35,559 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 44 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:48:35,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-03-20 12:48:35,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2022-03-20 12:48:35,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 84 states have (on average 1.0119047619047619) internal successors, (85), 84 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:35,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2022-03-20 12:48:35,580 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2022-03-20 12:48:35,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:48:35,580 INFO L478 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2022-03-20 12:48:35,580 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:35,580 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2022-03-20 12:48:35,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-03-20 12:48:35,581 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:48:35,581 INFO L499 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:48:35,599 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-03-20 12:48:35,781 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-03-20 12:48:35,782 INFO L403 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:48:35,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:48:35,782 INFO L85 PathProgramCache]: Analyzing trace with hash -1460366906, now seen corresponding path program 75 times [2022-03-20 12:48:35,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:35,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1966997489] [2022-03-20 12:48:35,783 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:48:35,783 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:48:35,783 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:48:35,784 INFO L85 PathProgramCache]: Analyzing trace with hash -1460366906, now seen corresponding path program 76 times [2022-03-20 12:48:35,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:48:35,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2059396888] [2022-03-20 12:48:35,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:48:35,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:48:35,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:36,356 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:48:36,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:36,359 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:36,359 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:48:36,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2059396888] [2022-03-20 12:48:36,359 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2059396888] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:48:36,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474384669] [2022-03-20 12:48:36,359 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:48:36,359 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:48:36,359 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:48:36,360 INFO L229 MonitoredProcess]: Starting monitored process 39 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:48:36,361 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-03-20 12:48:36,576 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:48:36,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:48:36,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 40 conjunts are in the unsatisfiable core [2022-03-20 12:48:36,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:48:36,715 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:36,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:48:38,247 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:38,248 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474384669] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:48:38,248 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:48:38,248 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 82 [2022-03-20 12:48:38,248 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:48:38,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1966997489] [2022-03-20 12:48:38,248 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1966997489] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:48:38,248 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:48:38,248 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-03-20 12:48:38,248 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149794489] [2022-03-20 12:48:38,248 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:48:38,249 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-03-20 12:48:38,249 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:38,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-03-20 12:48:38,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3242, Invalid=3400, Unknown=0, NotChecked=0, Total=6642 [2022-03-20 12:48:38,250 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:38,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:48:38,978 INFO L93 Difference]: Finished difference Result 98 states and 98 transitions. [2022-03-20 12:48:38,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-03-20 12:48:38,978 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 88 [2022-03-20 12:48:38,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:48:38,979 INFO L225 Difference]: With dead ends: 98 [2022-03-20 12:48:38,979 INFO L226 Difference]: Without dead ends: 92 [2022-03-20 12:48:38,981 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 968 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=6402, Invalid=8118, Unknown=0, NotChecked=0, Total=14520 [2022-03-20 12:48:38,981 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 86 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:48:38,981 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 34 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:48:38,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-03-20 12:48:39,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2022-03-20 12:48:39,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0116279069767442) internal successors, (87), 86 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:39,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2022-03-20 12:48:39,002 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2022-03-20 12:48:39,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:48:39,002 INFO L478 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2022-03-20 12:48:39,002 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:39,002 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2022-03-20 12:48:39,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-03-20 12:48:39,003 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:48:39,003 INFO L499 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:48:39,028 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-03-20 12:48:39,219 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-03-20 12:48:39,219 INFO L403 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:48:39,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:48:39,220 INFO L85 PathProgramCache]: Analyzing trace with hash 167621736, now seen corresponding path program 77 times [2022-03-20 12:48:39,220 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:39,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1866159331] [2022-03-20 12:48:39,221 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:48:39,221 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:48:39,221 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:48:39,221 INFO L85 PathProgramCache]: Analyzing trace with hash 167621736, now seen corresponding path program 78 times [2022-03-20 12:48:39,221 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:48:39,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1316119240] [2022-03-20 12:48:39,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:48:39,222 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:48:39,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:39,818 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:48:39,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:39,821 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:39,821 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:48:39,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1316119240] [2022-03-20 12:48:39,821 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1316119240] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:48:39,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1726511616] [2022-03-20 12:48:39,822 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:48:39,822 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:48:39,822 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:48:39,823 INFO L229 MonitoredProcess]: Starting monitored process 40 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:48:39,824 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-03-20 12:48:51,398 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 40 check-sat command(s) [2022-03-20 12:48:51,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:48:51,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 41 conjunts are in the unsatisfiable core [2022-03-20 12:48:51,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:48:51,611 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:51,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:48:53,238 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:53,238 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1726511616] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:48:53,238 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:48:53,238 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 84 [2022-03-20 12:48:53,238 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:48:53,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1866159331] [2022-03-20 12:48:53,238 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1866159331] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:48:53,238 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:48:53,239 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-03-20 12:48:53,239 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566626506] [2022-03-20 12:48:53,239 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:48:53,239 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-03-20 12:48:53,239 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:53,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-03-20 12:48:53,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3405, Invalid=3567, Unknown=0, NotChecked=0, Total=6972 [2022-03-20 12:48:53,240 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand has 43 states, 43 states have (on average 2.0) internal successors, (86), 42 states have internal predecessors, (86), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:54,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:48:54,013 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2022-03-20 12:48:54,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-03-20 12:48:54,014 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.0) internal successors, (86), 42 states have internal predecessors, (86), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 90 [2022-03-20 12:48:54,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:48:54,014 INFO L225 Difference]: With dead ends: 100 [2022-03-20 12:48:54,014 INFO L226 Difference]: Without dead ends: 94 [2022-03-20 12:48:54,015 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1013 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=6726, Invalid=8526, Unknown=0, NotChecked=0, Total=15252 [2022-03-20 12:48:54,016 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 88 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:48:54,016 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 54 Invalid, 176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:48:54,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2022-03-20 12:48:54,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2022-03-20 12:48:54,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 88 states have (on average 1.0113636363636365) internal successors, (89), 88 states have internal predecessors, (89), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:54,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2022-03-20 12:48:54,028 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2022-03-20 12:48:54,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:48:54,029 INFO L478 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2022-03-20 12:48:54,029 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.0) internal successors, (86), 42 states have internal predecessors, (86), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:54,029 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2022-03-20 12:48:54,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-03-20 12:48:54,029 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:48:54,030 INFO L499 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:48:54,058 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2022-03-20 12:48:54,237 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:48:54,237 INFO L403 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:48:54,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:48:54,237 INFO L85 PathProgramCache]: Analyzing trace with hash 1296610954, now seen corresponding path program 79 times [2022-03-20 12:48:54,237 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:54,238 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1219623873] [2022-03-20 12:48:54,239 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:48:54,239 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:48:54,239 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:48:54,239 INFO L85 PathProgramCache]: Analyzing trace with hash 1296610954, now seen corresponding path program 80 times [2022-03-20 12:48:54,239 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:48:54,239 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250429512] [2022-03-20 12:48:54,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:48:54,240 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:48:54,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:54,864 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:48:54,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:54,867 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:54,867 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:48:54,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250429512] [2022-03-20 12:48:54,867 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250429512] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:48:54,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [884197658] [2022-03-20 12:48:54,867 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:48:54,867 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:48:54,867 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:48:54,868 INFO L229 MonitoredProcess]: Starting monitored process 41 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:48:54,870 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-03-20 12:48:55,100 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:48:55,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:48:55,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 446 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-20 12:48:55,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:48:55,260 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:55,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:48:56,926 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:56,926 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [884197658] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:48:56,926 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:48:56,926 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 86 [2022-03-20 12:48:56,927 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:48:56,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1219623873] [2022-03-20 12:48:56,927 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1219623873] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:48:56,927 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:48:56,927 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-03-20 12:48:56,927 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032936267] [2022-03-20 12:48:56,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:48:56,927 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-03-20 12:48:56,927 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:56,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-03-20 12:48:56,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3572, Invalid=3738, Unknown=0, NotChecked=0, Total=7310 [2022-03-20 12:48:56,928 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand has 44 states, 44 states have (on average 2.0) internal successors, (88), 43 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:57,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:48:57,736 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2022-03-20 12:48:57,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-03-20 12:48:57,738 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.0) internal successors, (88), 43 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 92 [2022-03-20 12:48:57,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:48:57,738 INFO L225 Difference]: With dead ends: 102 [2022-03-20 12:48:57,738 INFO L226 Difference]: Without dead ends: 96 [2022-03-20 12:48:57,739 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1059 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=7058, Invalid=8944, Unknown=0, NotChecked=0, Total=16002 [2022-03-20 12:48:57,740 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 90 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:48:57,740 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 44 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:48:57,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-03-20 12:48:57,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2022-03-20 12:48:57,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.011111111111111) internal successors, (91), 90 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:57,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2022-03-20 12:48:57,753 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2022-03-20 12:48:57,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:48:57,753 INFO L478 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2022-03-20 12:48:57,753 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.0) internal successors, (88), 43 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:48:57,753 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2022-03-20 12:48:57,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-03-20 12:48:57,754 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:48:57,754 INFO L499 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:48:57,772 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-03-20 12:48:57,956 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2022-03-20 12:48:57,957 INFO L403 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:48:57,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:48:57,957 INFO L85 PathProgramCache]: Analyzing trace with hash -371476436, now seen corresponding path program 81 times [2022-03-20 12:48:57,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:48:57,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1362857982] [2022-03-20 12:48:57,959 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:48:57,959 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:48:57,959 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:48:57,959 INFO L85 PathProgramCache]: Analyzing trace with hash -371476436, now seen corresponding path program 82 times [2022-03-20 12:48:57,959 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:48:57,959 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877823002] [2022-03-20 12:48:57,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:48:57,959 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:48:57,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:58,719 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:48:58,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:48:58,722 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:58,722 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:48:58,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877823002] [2022-03-20 12:48:58,722 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1877823002] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:48:58,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [676642357] [2022-03-20 12:48:58,722 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:48:58,722 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:48:58,723 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:48:58,724 INFO L229 MonitoredProcess]: Starting monitored process 42 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:48:58,725 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-03-20 12:48:58,989 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:48:58,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:48:58,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 455 conjuncts, 43 conjunts are in the unsatisfiable core [2022-03-20 12:48:58,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:48:59,141 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:48:59,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:49:00,839 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:49:00,840 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [676642357] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:49:00,840 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:49:00,840 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 44] total 88 [2022-03-20 12:49:00,840 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:49:00,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1362857982] [2022-03-20 12:49:00,840 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1362857982] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:49:00,840 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:49:00,840 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-03-20 12:49:00,840 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733124149] [2022-03-20 12:49:00,840 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:49:00,841 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-03-20 12:49:00,841 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:49:00,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-03-20 12:49:00,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3743, Invalid=3913, Unknown=0, NotChecked=0, Total=7656 [2022-03-20 12:49:00,842 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand has 45 states, 45 states have (on average 2.0) internal successors, (90), 44 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:49:01,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:49:01,649 INFO L93 Difference]: Finished difference Result 104 states and 104 transitions. [2022-03-20 12:49:01,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-03-20 12:49:01,650 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.0) internal successors, (90), 44 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 94 [2022-03-20 12:49:01,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:49:01,650 INFO L225 Difference]: With dead ends: 104 [2022-03-20 12:49:01,650 INFO L226 Difference]: Without dead ends: 98 [2022-03-20 12:49:01,652 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1106 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=7398, Invalid=9372, Unknown=0, NotChecked=0, Total=16770 [2022-03-20 12:49:01,652 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 92 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:49:01,652 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 34 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:49:01,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-03-20 12:49:01,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2022-03-20 12:49:01,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0108695652173914) internal successors, (93), 92 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:49:01,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2022-03-20 12:49:01,672 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2022-03-20 12:49:01,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:49:01,673 INFO L478 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2022-03-20 12:49:01,673 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.0) internal successors, (90), 44 states have internal predecessors, (90), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:49:01,673 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2022-03-20 12:49:01,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-03-20 12:49:01,673 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:49:01,674 INFO L499 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:49:01,698 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2022-03-20 12:49:01,893 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,42 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:49:01,893 INFO L403 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:49:01,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:49:01,894 INFO L85 PathProgramCache]: Analyzing trace with hash -1380656818, now seen corresponding path program 83 times [2022-03-20 12:49:01,894 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:49:01,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [141150692] [2022-03-20 12:49:01,896 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:49:01,896 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:49:01,896 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:49:01,896 INFO L85 PathProgramCache]: Analyzing trace with hash -1380656818, now seen corresponding path program 84 times [2022-03-20 12:49:01,896 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:49:01,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1447258602] [2022-03-20 12:49:01,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:49:01,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:49:01,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:49:02,574 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:49:02,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:49:02,592 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:49:02,592 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:49:02,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1447258602] [2022-03-20 12:49:02,592 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1447258602] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:49:02,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1611654420] [2022-03-20 12:49:02,593 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:49:02,593 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:49:02,593 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:49:02,596 INFO L229 MonitoredProcess]: Starting monitored process 43 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:49:02,614 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-03-20 12:49:17,592 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 43 check-sat command(s) [2022-03-20 12:49:17,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:49:17,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 44 conjunts are in the unsatisfiable core [2022-03-20 12:49:17,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:49:17,763 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:49:17,763 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:49:19,693 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:49:19,694 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1611654420] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:49:19,694 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:49:19,694 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45, 45] total 90 [2022-03-20 12:49:19,694 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:49:19,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [141150692] [2022-03-20 12:49:19,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [141150692] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:49:19,695 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:49:19,695 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-03-20 12:49:19,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469972894] [2022-03-20 12:49:19,695 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:49:19,695 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-03-20 12:49:19,695 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:49:19,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-03-20 12:49:19,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3918, Invalid=4092, Unknown=0, NotChecked=0, Total=8010 [2022-03-20 12:49:19,697 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:49:20,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:49:20,528 INFO L93 Difference]: Finished difference Result 106 states and 106 transitions. [2022-03-20 12:49:20,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-03-20 12:49:20,528 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 96 [2022-03-20 12:49:20,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:49:20,529 INFO L225 Difference]: With dead ends: 106 [2022-03-20 12:49:20,529 INFO L226 Difference]: Without dead ends: 100 [2022-03-20 12:49:20,531 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1154 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=7746, Invalid=9810, Unknown=0, NotChecked=0, Total=17556 [2022-03-20 12:49:20,531 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 94 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:49:20,531 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 34 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:49:20,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-03-20 12:49:20,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2022-03-20 12:49:20,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.0106382978723405) internal successors, (95), 94 states have internal predecessors, (95), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:49:20,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2022-03-20 12:49:20,552 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2022-03-20 12:49:20,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:49:20,552 INFO L478 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2022-03-20 12:49:20,552 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:49:20,552 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2022-03-20 12:49:20,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-03-20 12:49:20,553 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:49:20,553 INFO L499 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:49:20,586 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-03-20 12:49:20,779 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:49:20,779 INFO L403 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:49:20,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:49:20,780 INFO L85 PathProgramCache]: Analyzing trace with hash -540395024, now seen corresponding path program 85 times [2022-03-20 12:49:20,780 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:49:20,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1905125967] [2022-03-20 12:49:20,781 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:49:20,782 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:49:20,782 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:49:20,782 INFO L85 PathProgramCache]: Analyzing trace with hash -540395024, now seen corresponding path program 86 times [2022-03-20 12:49:20,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:49:20,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1229989947] [2022-03-20 12:49:20,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:49:20,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:49:20,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:49:21,582 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:49:21,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:49:21,585 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:49:21,585 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:49:21,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1229989947] [2022-03-20 12:49:21,585 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1229989947] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:49:21,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [410169829] [2022-03-20 12:49:21,585 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:49:21,587 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:49:21,587 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:49:21,588 INFO L229 MonitoredProcess]: Starting monitored process 44 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:49:21,590 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-03-20 12:49:21,841 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:49:21,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:49:21,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 473 conjuncts, 45 conjunts are in the unsatisfiable core [2022-03-20 12:49:21,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:49:22,002 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:49:22,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:49:23,875 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:49:23,875 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [410169829] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:49:23,875 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:49:23,875 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 92 [2022-03-20 12:49:23,875 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:49:23,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1905125967] [2022-03-20 12:49:23,876 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1905125967] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:49:23,876 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:49:23,876 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2022-03-20 12:49:23,876 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865130740] [2022-03-20 12:49:23,876 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:49:23,876 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-03-20 12:49:23,876 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:49:23,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-03-20 12:49:23,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4097, Invalid=4275, Unknown=0, NotChecked=0, Total=8372 [2022-03-20 12:49:23,878 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand has 47 states, 47 states have (on average 2.0) internal successors, (94), 46 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:49:24,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:49:24,759 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2022-03-20 12:49:24,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-03-20 12:49:24,760 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.0) internal successors, (94), 46 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 98 [2022-03-20 12:49:24,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:49:24,760 INFO L225 Difference]: With dead ends: 108 [2022-03-20 12:49:24,760 INFO L226 Difference]: Without dead ends: 102 [2022-03-20 12:49:24,761 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1203 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=8102, Invalid=10258, Unknown=0, NotChecked=0, Total=18360 [2022-03-20 12:49:24,762 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 96 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:49:24,762 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 44 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:49:24,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-03-20 12:49:24,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2022-03-20 12:49:24,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 96 states have (on average 1.0104166666666667) internal successors, (97), 96 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:49:24,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2022-03-20 12:49:24,782 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2022-03-20 12:49:24,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:49:24,782 INFO L478 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2022-03-20 12:49:24,782 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.0) internal successors, (94), 46 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:49:24,782 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2022-03-20 12:49:24,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2022-03-20 12:49:24,783 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:49:24,783 INFO L499 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:49:24,801 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2022-03-20 12:49:24,987 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-03-20 12:49:24,987 INFO L403 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:49:24,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:49:24,988 INFO L85 PathProgramCache]: Analyzing trace with hash -502662638, now seen corresponding path program 87 times [2022-03-20 12:49:24,988 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:49:24,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [278491113] [2022-03-20 12:49:24,990 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:49:24,990 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:49:24,990 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:49:24,990 INFO L85 PathProgramCache]: Analyzing trace with hash -502662638, now seen corresponding path program 88 times [2022-03-20 12:49:24,990 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:49:24,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1764902213] [2022-03-20 12:49:24,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:49:24,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:49:25,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:49:25,806 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:49:25,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:49:25,808 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:49:25,808 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:49:25,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1764902213] [2022-03-20 12:49:25,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1764902213] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:49:25,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1212455707] [2022-03-20 12:49:25,809 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:49:25,809 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:49:25,809 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:49:25,812 INFO L229 MonitoredProcess]: Starting monitored process 45 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:49:25,813 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-03-20 12:49:26,067 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:49:26,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:49:26,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 46 conjunts are in the unsatisfiable core [2022-03-20 12:49:26,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:49:26,219 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:49:26,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:49:28,161 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:49:28,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1212455707] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:49:28,162 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:49:28,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47, 47] total 94 [2022-03-20 12:49:28,162 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:49:28,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [278491113] [2022-03-20 12:49:28,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [278491113] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:49:28,162 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:49:28,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2022-03-20 12:49:28,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203388208] [2022-03-20 12:49:28,162 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:49:28,163 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-03-20 12:49:28,163 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:49:28,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-03-20 12:49:28,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4280, Invalid=4462, Unknown=0, NotChecked=0, Total=8742 [2022-03-20 12:49:28,164 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand has 48 states, 48 states have (on average 2.0) internal successors, (96), 47 states have internal predecessors, (96), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:49:29,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:49:29,264 INFO L93 Difference]: Finished difference Result 110 states and 110 transitions. [2022-03-20 12:49:29,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-03-20 12:49:29,265 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.0) internal successors, (96), 47 states have internal predecessors, (96), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 100 [2022-03-20 12:49:29,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:49:29,266 INFO L225 Difference]: With dead ends: 110 [2022-03-20 12:49:29,266 INFO L226 Difference]: Without dead ends: 104 [2022-03-20 12:49:29,267 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1253 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=8466, Invalid=10716, Unknown=0, NotChecked=0, Total=19182 [2022-03-20 12:49:29,267 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 98 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:49:29,267 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 39 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:49:29,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-03-20 12:49:29,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2022-03-20 12:49:29,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.010204081632653) internal successors, (99), 98 states have internal predecessors, (99), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:49:29,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2022-03-20 12:49:29,288 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 100 [2022-03-20 12:49:29,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:49:29,288 INFO L478 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2022-03-20 12:49:29,288 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.0) internal successors, (96), 47 states have internal predecessors, (96), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:49:29,288 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2022-03-20 12:49:29,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2022-03-20 12:49:29,289 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:49:29,289 INFO L499 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:49:29,314 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-03-20 12:49:29,503 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-03-20 12:49:29,503 INFO L403 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:49:29,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:49:29,504 INFO L85 PathProgramCache]: Analyzing trace with hash 1398421940, now seen corresponding path program 89 times [2022-03-20 12:49:29,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:49:29,504 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2146867044] [2022-03-20 12:49:29,505 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:49:29,505 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:49:29,506 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:49:29,506 INFO L85 PathProgramCache]: Analyzing trace with hash 1398421940, now seen corresponding path program 90 times [2022-03-20 12:49:29,506 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:49:29,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320606835] [2022-03-20 12:49:29,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:49:29,506 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:49:29,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:49:30,279 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:49:30,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:49:30,281 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:49:30,282 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:49:30,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320606835] [2022-03-20 12:49:30,282 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1320606835] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:49:30,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839518156] [2022-03-20 12:49:30,282 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:49:30,282 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:49:30,282 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:49:30,283 INFO L229 MonitoredProcess]: Starting monitored process 46 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:49:30,285 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-03-20 12:49:50,322 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 46 check-sat command(s) [2022-03-20 12:49:50,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:49:50,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 47 conjunts are in the unsatisfiable core [2022-03-20 12:49:50,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:49:50,509 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:49:50,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:49:52,531 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:49:52,532 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [839518156] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:49:52,532 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:49:52,532 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48, 48] total 96 [2022-03-20 12:49:52,532 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:49:52,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2146867044] [2022-03-20 12:49:52,532 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2146867044] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:49:52,532 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:49:52,532 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2022-03-20 12:49:52,532 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204489553] [2022-03-20 12:49:52,532 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:49:52,532 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-03-20 12:49:52,532 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:49:52,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-03-20 12:49:52,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4467, Invalid=4653, Unknown=0, NotChecked=0, Total=9120 [2022-03-20 12:49:52,534 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand has 49 states, 49 states have (on average 2.0) internal successors, (98), 48 states have internal predecessors, (98), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:49:53,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:49:53,481 INFO L93 Difference]: Finished difference Result 112 states and 112 transitions. [2022-03-20 12:49:53,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-03-20 12:49:53,482 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0) internal successors, (98), 48 states have internal predecessors, (98), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 102 [2022-03-20 12:49:53,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:49:53,482 INFO L225 Difference]: With dead ends: 112 [2022-03-20 12:49:53,482 INFO L226 Difference]: Without dead ends: 106 [2022-03-20 12:49:53,485 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1304 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=8838, Invalid=11184, Unknown=0, NotChecked=0, Total=20022 [2022-03-20 12:49:53,485 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 100 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:49:53,485 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 44 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:49:53,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-03-20 12:49:53,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2022-03-20 12:49:53,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 100 states have (on average 1.01) internal successors, (101), 100 states have internal predecessors, (101), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:49:53,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2022-03-20 12:49:53,508 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 102 [2022-03-20 12:49:53,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:49:53,508 INFO L478 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2022-03-20 12:49:53,508 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.0) internal successors, (98), 48 states have internal predecessors, (98), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:49:53,508 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2022-03-20 12:49:53,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-03-20 12:49:53,509 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:49:53,509 INFO L499 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:49:53,545 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2022-03-20 12:49:53,724 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-03-20 12:49:53,724 INFO L403 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:49:53,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:49:53,725 INFO L85 PathProgramCache]: Analyzing trace with hash -1315366698, now seen corresponding path program 91 times [2022-03-20 12:49:53,725 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:49:53,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [78312644] [2022-03-20 12:49:53,726 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:49:53,726 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:49:53,726 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:49:53,726 INFO L85 PathProgramCache]: Analyzing trace with hash -1315366698, now seen corresponding path program 92 times [2022-03-20 12:49:53,726 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:49:53,726 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [968508740] [2022-03-20 12:49:53,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:49:53,727 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:49:53,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:49:54,624 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:49:54,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:49:54,627 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:49:54,627 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:49:54,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [968508740] [2022-03-20 12:49:54,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [968508740] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:49:54,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1113123468] [2022-03-20 12:49:54,627 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:49:54,627 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:49:54,628 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:49:54,629 INFO L229 MonitoredProcess]: Starting monitored process 47 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:49:54,629 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-03-20 12:49:54,908 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:49:54,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:49:54,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 500 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-20 12:49:54,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:49:55,068 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:49:55,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:49:57,227 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:49:57,227 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1113123468] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:49:57,227 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:49:57,227 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49, 49] total 98 [2022-03-20 12:49:57,228 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:49:57,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [78312644] [2022-03-20 12:49:57,228 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [78312644] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:49:57,228 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:49:57,228 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2022-03-20 12:49:57,228 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115633992] [2022-03-20 12:49:57,228 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:49:57,228 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-03-20 12:49:57,228 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:49:57,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-03-20 12:49:57,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4658, Invalid=4848, Unknown=0, NotChecked=0, Total=9506 [2022-03-20 12:49:57,229 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:49:58,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:49:58,219 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2022-03-20 12:49:58,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-03-20 12:49:58,220 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 104 [2022-03-20 12:49:58,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:49:58,220 INFO L225 Difference]: With dead ends: 114 [2022-03-20 12:49:58,220 INFO L226 Difference]: Without dead ends: 108 [2022-03-20 12:49:58,222 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1356 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=9218, Invalid=11662, Unknown=0, NotChecked=0, Total=20880 [2022-03-20 12:49:58,222 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 102 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:49:58,222 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 39 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:49:58,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-03-20 12:49:58,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2022-03-20 12:49:58,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.0098039215686274) internal successors, (103), 102 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:49:58,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2022-03-20 12:49:58,240 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 104 [2022-03-20 12:49:58,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:49:58,241 INFO L478 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2022-03-20 12:49:58,241 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:49:58,241 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2022-03-20 12:49:58,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-03-20 12:49:58,241 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:49:58,241 INFO L499 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:49:58,259 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-03-20 12:49:58,442 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,47 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:49:58,442 INFO L403 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:49:58,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:49:58,442 INFO L85 PathProgramCache]: Analyzing trace with hash 2073868152, now seen corresponding path program 93 times [2022-03-20 12:49:58,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:49:58,443 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [379588173] [2022-03-20 12:49:58,444 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:49:58,444 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:49:58,444 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:49:58,444 INFO L85 PathProgramCache]: Analyzing trace with hash 2073868152, now seen corresponding path program 94 times [2022-03-20 12:49:58,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:49:58,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [476092381] [2022-03-20 12:49:58,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:49:58,444 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:49:58,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:49:59,263 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:49:59,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:49:59,265 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:49:59,265 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:49:59,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [476092381] [2022-03-20 12:49:59,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [476092381] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:49:59,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1216893238] [2022-03-20 12:49:59,265 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:49:59,266 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:49:59,266 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:49:59,267 INFO L229 MonitoredProcess]: Starting monitored process 48 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:49:59,267 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-03-20 12:49:59,546 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:49:59,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:49:59,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 49 conjunts are in the unsatisfiable core [2022-03-20 12:49:59,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:49:59,706 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:49:59,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:50:01,912 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:50:01,913 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1216893238] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:50:01,913 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:50:01,913 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 100 [2022-03-20 12:50:01,913 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:50:01,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [379588173] [2022-03-20 12:50:01,913 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [379588173] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:50:01,913 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:50:01,913 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2022-03-20 12:50:01,913 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114065402] [2022-03-20 12:50:01,913 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:50:01,914 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-03-20 12:50:01,914 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:50:01,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-03-20 12:50:01,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4853, Invalid=5047, Unknown=0, NotChecked=0, Total=9900 [2022-03-20 12:50:01,915 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand has 51 states, 51 states have (on average 2.0) internal successors, (102), 50 states have internal predecessors, (102), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:50:03,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:50:03,007 INFO L93 Difference]: Finished difference Result 116 states and 116 transitions. [2022-03-20 12:50:03,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-03-20 12:50:03,008 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.0) internal successors, (102), 50 states have internal predecessors, (102), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 106 [2022-03-20 12:50:03,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:50:03,008 INFO L225 Difference]: With dead ends: 116 [2022-03-20 12:50:03,008 INFO L226 Difference]: Without dead ends: 110 [2022-03-20 12:50:03,009 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 311 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1409 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=9606, Invalid=12150, Unknown=0, NotChecked=0, Total=21756 [2022-03-20 12:50:03,010 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 104 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:50:03,010 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 24 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:50:03,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-03-20 12:50:03,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2022-03-20 12:50:03,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0096153846153846) internal successors, (105), 104 states have internal predecessors, (105), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:50:03,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2022-03-20 12:50:03,034 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 106 [2022-03-20 12:50:03,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:50:03,034 INFO L478 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2022-03-20 12:50:03,034 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.0) internal successors, (102), 50 states have internal predecessors, (102), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:50:03,034 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2022-03-20 12:50:03,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-03-20 12:50:03,035 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:50:03,035 INFO L499 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:50:03,062 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-03-20 12:50:03,260 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-03-20 12:50:03,261 INFO L403 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:50:03,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:50:03,261 INFO L85 PathProgramCache]: Analyzing trace with hash -751618662, now seen corresponding path program 95 times [2022-03-20 12:50:03,261 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:50:03,261 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1014678093] [2022-03-20 12:50:03,263 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:50:03,263 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:50:03,263 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:50:03,263 INFO L85 PathProgramCache]: Analyzing trace with hash -751618662, now seen corresponding path program 96 times [2022-03-20 12:50:03,263 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:50:03,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1505387832] [2022-03-20 12:50:03,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:50:03,263 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:50:03,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:50:04,124 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:50:04,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:50:04,126 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:50:04,126 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:50:04,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1505387832] [2022-03-20 12:50:04,126 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1505387832] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:50:04,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [725616344] [2022-03-20 12:50:04,126 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:50:04,127 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:50:04,127 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:50:04,128 INFO L229 MonitoredProcess]: Starting monitored process 49 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:50:04,128 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-03-20 12:50:39,420 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 49 check-sat command(s) [2022-03-20 12:50:39,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:50:39,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 50 conjunts are in the unsatisfiable core [2022-03-20 12:50:39,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:50:39,632 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:50:39,632 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:50:41,906 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:50:41,906 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [725616344] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:50:41,906 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:50:41,906 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51, 51] total 102 [2022-03-20 12:50:41,906 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:50:41,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1014678093] [2022-03-20 12:50:41,906 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1014678093] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:50:41,906 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:50:41,906 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2022-03-20 12:50:41,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770724008] [2022-03-20 12:50:41,907 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:50:41,907 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-03-20 12:50:41,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:50:41,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-03-20 12:50:41,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5052, Invalid=5250, Unknown=0, NotChecked=0, Total=10302 [2022-03-20 12:50:41,909 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand has 52 states, 52 states have (on average 2.0) internal successors, (104), 51 states have internal predecessors, (104), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:50:42,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:50:42,949 INFO L93 Difference]: Finished difference Result 118 states and 118 transitions. [2022-03-20 12:50:42,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-03-20 12:50:42,949 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.0) internal successors, (104), 51 states have internal predecessors, (104), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 108 [2022-03-20 12:50:42,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:50:42,950 INFO L225 Difference]: With dead ends: 118 [2022-03-20 12:50:42,950 INFO L226 Difference]: Without dead ends: 112 [2022-03-20 12:50:42,951 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1463 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=10002, Invalid=12648, Unknown=0, NotChecked=0, Total=22650 [2022-03-20 12:50:42,951 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 106 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:50:42,951 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 39 Invalid, 188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:50:42,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2022-03-20 12:50:42,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2022-03-20 12:50:42,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.009433962264151) internal successors, (107), 106 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:50:42,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2022-03-20 12:50:42,968 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 108 [2022-03-20 12:50:42,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:50:42,968 INFO L478 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2022-03-20 12:50:42,968 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.0) internal successors, (104), 51 states have internal predecessors, (104), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:50:42,968 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2022-03-20 12:50:42,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-03-20 12:50:42,969 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:50:42,969 INFO L499 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:50:43,001 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2022-03-20 12:50:43,169 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-03-20 12:50:43,169 INFO L403 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:50:43,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:50:43,170 INFO L85 PathProgramCache]: Analyzing trace with hash -1625115844, now seen corresponding path program 97 times [2022-03-20 12:50:43,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:50:43,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [44751769] [2022-03-20 12:50:43,171 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:50:43,171 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:50:43,171 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:50:43,171 INFO L85 PathProgramCache]: Analyzing trace with hash -1625115844, now seen corresponding path program 98 times [2022-03-20 12:50:43,171 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:50:43,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [414994925] [2022-03-20 12:50:43,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:50:43,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:50:43,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:50:44,077 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:50:44,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:50:44,085 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:50:44,085 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:50:44,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [414994925] [2022-03-20 12:50:44,085 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [414994925] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:50:44,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2115292304] [2022-03-20 12:50:44,085 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:50:44,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:50:44,086 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:50:44,086 INFO L229 MonitoredProcess]: Starting monitored process 50 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:50:44,087 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-03-20 12:50:44,393 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:50:44,393 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:50:44,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 51 conjunts are in the unsatisfiable core [2022-03-20 12:50:44,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:50:44,583 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:50:44,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:50:47,080 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:50:47,080 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2115292304] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:50:47,080 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:50:47,080 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52, 52] total 104 [2022-03-20 12:50:47,080 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:50:47,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [44751769] [2022-03-20 12:50:47,080 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [44751769] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:50:47,080 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:50:47,080 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2022-03-20 12:50:47,081 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806526996] [2022-03-20 12:50:47,081 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:50:47,081 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-03-20 12:50:47,081 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:50:47,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-03-20 12:50:47,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5255, Invalid=5457, Unknown=0, NotChecked=0, Total=10712 [2022-03-20 12:50:47,082 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand has 53 states, 53 states have (on average 2.0) internal successors, (106), 52 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:50:48,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:50:48,200 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2022-03-20 12:50:48,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-03-20 12:50:48,200 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0) internal successors, (106), 52 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 110 [2022-03-20 12:50:48,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:50:48,201 INFO L225 Difference]: With dead ends: 120 [2022-03-20 12:50:48,201 INFO L226 Difference]: Without dead ends: 114 [2022-03-20 12:50:48,203 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 171 SyntacticMatches, 0 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1518 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=10406, Invalid=13156, Unknown=0, NotChecked=0, Total=23562 [2022-03-20 12:50:48,203 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 108 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:50:48,203 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 34 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:50:48,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-03-20 12:50:48,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2022-03-20 12:50:48,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 108 states have (on average 1.0092592592592593) internal successors, (109), 108 states have internal predecessors, (109), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:50:48,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2022-03-20 12:50:48,229 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 110 [2022-03-20 12:50:48,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:50:48,229 INFO L478 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2022-03-20 12:50:48,229 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.0) internal successors, (106), 52 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:50:48,229 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2022-03-20 12:50:48,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2022-03-20 12:50:48,230 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:50:48,230 INFO L499 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:50:48,258 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2022-03-20 12:50:48,440 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:50:48,440 INFO L403 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:50:48,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:50:48,440 INFO L85 PathProgramCache]: Analyzing trace with hash 757682270, now seen corresponding path program 99 times [2022-03-20 12:50:48,441 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:50:48,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1263061941] [2022-03-20 12:50:48,442 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:50:48,442 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:50:48,442 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:50:48,442 INFO L85 PathProgramCache]: Analyzing trace with hash 757682270, now seen corresponding path program 100 times [2022-03-20 12:50:48,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:50:48,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [703019623] [2022-03-20 12:50:48,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:50:48,442 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:50:48,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:50:49,392 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:50:49,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:50:49,396 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:50:49,396 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:50:49,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [703019623] [2022-03-20 12:50:49,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [703019623] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:50:49,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1330334548] [2022-03-20 12:50:49,396 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:50:49,396 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:50:49,397 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:50:49,398 INFO L229 MonitoredProcess]: Starting monitored process 51 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:50:49,399 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-03-20 12:50:49,703 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:50:49,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:50:49,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 536 conjuncts, 52 conjunts are in the unsatisfiable core [2022-03-20 12:50:49,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:50:49,870 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:50:49,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:50:52,326 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:50:52,326 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1330334548] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:50:52,326 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:50:52,326 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53, 53] total 106 [2022-03-20 12:50:52,326 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:50:52,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1263061941] [2022-03-20 12:50:52,327 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1263061941] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:50:52,327 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:50:52,327 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2022-03-20 12:50:52,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747918500] [2022-03-20 12:50:52,327 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:50:52,327 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-03-20 12:50:52,327 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:50:52,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-03-20 12:50:52,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5462, Invalid=5668, Unknown=0, NotChecked=0, Total=11130 [2022-03-20 12:50:52,329 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand has 54 states, 54 states have (on average 2.0) internal successors, (108), 53 states have internal predecessors, (108), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:50:53,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:50:53,438 INFO L93 Difference]: Finished difference Result 122 states and 122 transitions. [2022-03-20 12:50:53,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-03-20 12:50:53,439 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.0) internal successors, (108), 53 states have internal predecessors, (108), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 112 [2022-03-20 12:50:53,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:50:53,439 INFO L225 Difference]: With dead ends: 122 [2022-03-20 12:50:53,439 INFO L226 Difference]: Without dead ends: 116 [2022-03-20 12:50:53,441 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1574 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=10818, Invalid=13674, Unknown=0, NotChecked=0, Total=24492 [2022-03-20 12:50:53,441 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 110 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:50:53,441 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 34 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:50:53,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-03-20 12:50:53,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2022-03-20 12:50:53,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.009090909090909) internal successors, (111), 110 states have internal predecessors, (111), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:50:53,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2022-03-20 12:50:53,459 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 112 [2022-03-20 12:50:53,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:50:53,459 INFO L478 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2022-03-20 12:50:53,459 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.0) internal successors, (108), 53 states have internal predecessors, (108), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:50:53,459 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2022-03-20 12:50:53,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-03-20 12:50:53,460 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:50:53,460 INFO L499 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:50:53,478 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2022-03-20 12:50:53,660 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2022-03-20 12:50:53,660 INFO L403 AbstractCegarLoop]: === Iteration 53 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:50:53,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:50:53,661 INFO L85 PathProgramCache]: Analyzing trace with hash 1409101056, now seen corresponding path program 101 times [2022-03-20 12:50:53,661 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:50:53,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2128042423] [2022-03-20 12:50:53,662 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:50:53,662 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:50:53,662 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:50:53,662 INFO L85 PathProgramCache]: Analyzing trace with hash 1409101056, now seen corresponding path program 102 times [2022-03-20 12:50:53,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:50:53,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [433458679] [2022-03-20 12:50:53,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:50:53,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:50:53,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:50:54,599 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:50:54,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:50:54,602 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:50:54,602 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:50:54,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [433458679] [2022-03-20 12:50:54,602 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [433458679] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:50:54,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [989887496] [2022-03-20 12:50:54,602 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:50:54,602 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:50:54,603 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:50:54,604 INFO L229 MonitoredProcess]: Starting monitored process 52 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:50:54,604 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-03-20 12:51:58,960 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 52 check-sat command(s) [2022-03-20 12:51:58,960 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:51:59,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 53 conjunts are in the unsatisfiable core [2022-03-20 12:51:59,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:51:59,234 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:51:59,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:52:01,876 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:52:01,876 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [989887496] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:52:01,876 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:52:01,876 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 108 [2022-03-20 12:52:01,876 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:52:01,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2128042423] [2022-03-20 12:52:01,877 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2128042423] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:52:01,877 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:52:01,877 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2022-03-20 12:52:01,877 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631751715] [2022-03-20 12:52:01,877 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:52:01,877 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-03-20 12:52:01,877 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:52:01,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-03-20 12:52:01,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5673, Invalid=5883, Unknown=0, NotChecked=0, Total=11556 [2022-03-20 12:52:01,878 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand has 55 states, 55 states have (on average 2.0) internal successors, (110), 54 states have internal predecessors, (110), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:52:03,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:52:03,061 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2022-03-20 12:52:03,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-03-20 12:52:03,062 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.0) internal successors, (110), 54 states have internal predecessors, (110), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 114 [2022-03-20 12:52:03,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:52:03,063 INFO L225 Difference]: With dead ends: 124 [2022-03-20 12:52:03,063 INFO L226 Difference]: Without dead ends: 118 [2022-03-20 12:52:03,064 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1631 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=11238, Invalid=14202, Unknown=0, NotChecked=0, Total=25440 [2022-03-20 12:52:03,064 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 112 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:52:03,064 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 44 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:52:03,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2022-03-20 12:52:03,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2022-03-20 12:52:03,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 112 states have (on average 1.0089285714285714) internal successors, (113), 112 states have internal predecessors, (113), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:52:03,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2022-03-20 12:52:03,082 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 114 [2022-03-20 12:52:03,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:52:03,083 INFO L478 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2022-03-20 12:52:03,083 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.0) internal successors, (110), 54 states have internal predecessors, (110), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:52:03,083 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2022-03-20 12:52:03,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-03-20 12:52:03,083 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:52:03,084 INFO L499 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:52:03,131 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2022-03-20 12:52:03,311 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,52 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:52:03,311 INFO L403 AbstractCegarLoop]: === Iteration 54 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:52:03,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:52:03,312 INFO L85 PathProgramCache]: Analyzing trace with hash 357329186, now seen corresponding path program 103 times [2022-03-20 12:52:03,312 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:52:03,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [875448483] [2022-03-20 12:52:03,313 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:52:03,313 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:52:03,313 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:52:03,313 INFO L85 PathProgramCache]: Analyzing trace with hash 357329186, now seen corresponding path program 104 times [2022-03-20 12:52:03,313 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:52:03,314 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712895394] [2022-03-20 12:52:03,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:52:03,314 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:52:03,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:52:04,345 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:52:04,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:52:04,348 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:52:04,348 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:52:04,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1712895394] [2022-03-20 12:52:04,348 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1712895394] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:52:04,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [574961784] [2022-03-20 12:52:04,349 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:52:04,349 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:52:04,349 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:52:04,351 INFO L229 MonitoredProcess]: Starting monitored process 53 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:52:04,351 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-03-20 12:52:04,698 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:52:04,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:52:04,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 554 conjuncts, 54 conjunts are in the unsatisfiable core [2022-03-20 12:52:04,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:52:04,900 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:52:04,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:52:07,588 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:52:07,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [574961784] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:52:07,588 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:52:07,588 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55, 55] total 110 [2022-03-20 12:52:07,589 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:52:07,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [875448483] [2022-03-20 12:52:07,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [875448483] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:52:07,589 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:52:07,589 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2022-03-20 12:52:07,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7971449] [2022-03-20 12:52:07,589 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:52:07,589 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-03-20 12:52:07,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:52:07,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-03-20 12:52:07,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5888, Invalid=6102, Unknown=0, NotChecked=0, Total=11990 [2022-03-20 12:52:07,591 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand has 56 states, 56 states have (on average 2.0) internal successors, (112), 55 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:52:08,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:52:08,828 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2022-03-20 12:52:08,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-03-20 12:52:08,828 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.0) internal successors, (112), 55 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 116 [2022-03-20 12:52:08,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:52:08,829 INFO L225 Difference]: With dead ends: 126 [2022-03-20 12:52:08,829 INFO L226 Difference]: Without dead ends: 120 [2022-03-20 12:52:08,831 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1689 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=11666, Invalid=14740, Unknown=0, NotChecked=0, Total=26406 [2022-03-20 12:52:08,831 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 114 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:52:08,832 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 44 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 145 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:52:08,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-03-20 12:52:08,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2022-03-20 12:52:08,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 114 states have (on average 1.0087719298245614) internal successors, (115), 114 states have internal predecessors, (115), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:52:08,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2022-03-20 12:52:08,861 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 116 [2022-03-20 12:52:08,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:52:08,861 INFO L478 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2022-03-20 12:52:08,861 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.0) internal successors, (112), 55 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:52:08,861 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2022-03-20 12:52:08,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2022-03-20 12:52:08,862 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:52:08,862 INFO L499 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:52:08,889 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2022-03-20 12:52:09,075 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2022-03-20 12:52:09,075 INFO L403 AbstractCegarLoop]: === Iteration 55 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:52:09,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:52:09,076 INFO L85 PathProgramCache]: Analyzing trace with hash -1078123324, now seen corresponding path program 105 times [2022-03-20 12:52:09,076 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:52:09,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [963953154] [2022-03-20 12:52:09,077 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:52:09,077 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:52:09,077 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:52:09,077 INFO L85 PathProgramCache]: Analyzing trace with hash -1078123324, now seen corresponding path program 106 times [2022-03-20 12:52:09,078 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:52:09,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [6298734] [2022-03-20 12:52:09,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:52:09,078 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:52:09,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:52:10,196 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:52:10,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:52:10,198 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:52:10,198 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:52:10,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [6298734] [2022-03-20 12:52:10,199 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [6298734] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:52:10,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1453040131] [2022-03-20 12:52:10,199 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:52:10,199 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:52:10,199 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:52:10,200 INFO L229 MonitoredProcess]: Starting monitored process 54 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:52:10,201 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-03-20 12:52:10,541 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:52:10,542 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:52:10,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 563 conjuncts, 55 conjunts are in the unsatisfiable core [2022-03-20 12:52:10,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:52:10,716 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:52:10,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:52:13,547 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:52:13,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1453040131] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:52:13,547 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:52:13,547 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56, 56] total 112 [2022-03-20 12:52:13,547 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:52:13,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [963953154] [2022-03-20 12:52:13,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [963953154] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:52:13,547 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:52:13,547 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2022-03-20 12:52:13,548 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251690286] [2022-03-20 12:52:13,548 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:52:13,548 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-03-20 12:52:13,548 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:52:13,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-03-20 12:52:13,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6107, Invalid=6325, Unknown=0, NotChecked=0, Total=12432 [2022-03-20 12:52:13,549 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand has 57 states, 57 states have (on average 2.0) internal successors, (114), 56 states have internal predecessors, (114), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:52:14,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:52:14,833 INFO L93 Difference]: Finished difference Result 128 states and 128 transitions. [2022-03-20 12:52:14,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-03-20 12:52:14,833 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.0) internal successors, (114), 56 states have internal predecessors, (114), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 118 [2022-03-20 12:52:14,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:52:14,834 INFO L225 Difference]: With dead ends: 128 [2022-03-20 12:52:14,834 INFO L226 Difference]: Without dead ends: 122 [2022-03-20 12:52:14,835 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 183 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1748 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=12102, Invalid=15288, Unknown=0, NotChecked=0, Total=27390 [2022-03-20 12:52:14,835 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 116 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:52:14,835 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 29 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:52:14,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-03-20 12:52:14,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2022-03-20 12:52:14,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.0086206896551724) internal successors, (117), 116 states have internal predecessors, (117), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:52:14,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2022-03-20 12:52:14,865 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 118 [2022-03-20 12:52:14,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:52:14,866 INFO L478 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2022-03-20 12:52:14,866 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 2.0) internal successors, (114), 56 states have internal predecessors, (114), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:52:14,866 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2022-03-20 12:52:14,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2022-03-20 12:52:14,866 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:52:14,867 INFO L499 BasicCegarLoop]: trace histogram [54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:52:14,893 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2022-03-20 12:52:15,091 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2022-03-20 12:52:15,092 INFO L403 AbstractCegarLoop]: === Iteration 56 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:52:15,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:52:15,092 INFO L85 PathProgramCache]: Analyzing trace with hash -1863483418, now seen corresponding path program 107 times [2022-03-20 12:52:15,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:52:15,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [717311493] [2022-03-20 12:52:15,093 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:52:15,093 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:52:15,094 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:52:15,094 INFO L85 PathProgramCache]: Analyzing trace with hash -1863483418, now seen corresponding path program 108 times [2022-03-20 12:52:15,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:52:15,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1541279814] [2022-03-20 12:52:15,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:52:15,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:52:15,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:52:16,210 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:52:16,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:52:16,217 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 2916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:52:16,217 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:52:16,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1541279814] [2022-03-20 12:52:16,217 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1541279814] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:52:16,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1807835978] [2022-03-20 12:52:16,217 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:52:16,218 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:52:16,218 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:52:16,219 INFO L229 MonitoredProcess]: Starting monitored process 55 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:52:16,220 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-03-20 12:53:15,953 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2022-03-20 12:53:15,953 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:53:16,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 572 conjuncts, 56 conjunts are in the unsatisfiable core [2022-03-20 12:53:16,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:53:16,199 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 2916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:53:16,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:53:19,052 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 2916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:53:19,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1807835978] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:53:19,053 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:53:19,053 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57, 57] total 114 [2022-03-20 12:53:19,053 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:53:19,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [717311493] [2022-03-20 12:53:19,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [717311493] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:53:19,053 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:53:19,053 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2022-03-20 12:53:19,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110356524] [2022-03-20 12:53:19,053 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:53:19,054 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-03-20 12:53:19,054 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:53:19,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-03-20 12:53:19,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6330, Invalid=6552, Unknown=0, NotChecked=0, Total=12882 [2022-03-20 12:53:19,056 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand has 58 states, 58 states have (on average 2.0) internal successors, (116), 57 states have internal predecessors, (116), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:53:20,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:53:20,336 INFO L93 Difference]: Finished difference Result 130 states and 130 transitions. [2022-03-20 12:53:20,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-03-20 12:53:20,338 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.0) internal successors, (116), 57 states have internal predecessors, (116), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 120 [2022-03-20 12:53:20,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:53:20,338 INFO L225 Difference]: With dead ends: 130 [2022-03-20 12:53:20,339 INFO L226 Difference]: Without dead ends: 124 [2022-03-20 12:53:20,340 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1808 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=12546, Invalid=15846, Unknown=0, NotChecked=0, Total=28392 [2022-03-20 12:53:20,341 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 118 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:53:20,341 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [118 Valid, 44 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:53:20,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-03-20 12:53:20,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2022-03-20 12:53:20,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 118 states have (on average 1.0084745762711864) internal successors, (119), 118 states have internal predecessors, (119), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:53:20,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2022-03-20 12:53:20,360 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 120 [2022-03-20 12:53:20,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:53:20,361 INFO L478 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2022-03-20 12:53:20,361 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.0) internal successors, (116), 57 states have internal predecessors, (116), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:53:20,361 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2022-03-20 12:53:20,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-03-20 12:53:20,361 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:53:20,361 INFO L499 BasicCegarLoop]: trace histogram [55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:53:20,396 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2022-03-20 12:53:20,561 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,55 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:53:20,562 INFO L403 AbstractCegarLoop]: === Iteration 57 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:53:20,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:53:20,562 INFO L85 PathProgramCache]: Analyzing trace with hash -680289656, now seen corresponding path program 109 times [2022-03-20 12:53:20,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:53:20,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [549811252] [2022-03-20 12:53:20,564 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:53:20,564 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:53:20,564 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:53:20,564 INFO L85 PathProgramCache]: Analyzing trace with hash -680289656, now seen corresponding path program 110 times [2022-03-20 12:53:20,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:53:20,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [371339190] [2022-03-20 12:53:20,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:53:20,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:53:20,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:53:21,693 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:53:21,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:53:21,696 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 0 proven. 3025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:53:21,696 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:53:21,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [371339190] [2022-03-20 12:53:21,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [371339190] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:53:21,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1733860805] [2022-03-20 12:53:21,697 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:53:21,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:53:21,697 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:53:21,698 INFO L229 MonitoredProcess]: Starting monitored process 56 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:53:21,698 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2022-03-20 12:53:22,062 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:53:22,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:53:22,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 581 conjuncts, 57 conjunts are in the unsatisfiable core [2022-03-20 12:53:22,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:53:22,295 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 0 proven. 3025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:53:22,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:53:25,333 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 0 proven. 3025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:53:25,334 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1733860805] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:53:25,334 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:53:25,334 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 116 [2022-03-20 12:53:25,334 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:53:25,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [549811252] [2022-03-20 12:53:25,334 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [549811252] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:53:25,334 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:53:25,334 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2022-03-20 12:53:25,335 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106255492] [2022-03-20 12:53:25,335 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:53:25,335 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-03-20 12:53:25,335 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:53:25,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-03-20 12:53:25,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6557, Invalid=6783, Unknown=0, NotChecked=0, Total=13340 [2022-03-20 12:53:25,336 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand has 59 states, 59 states have (on average 2.0) internal successors, (118), 58 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:53:26,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:53:26,723 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2022-03-20 12:53:26,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-03-20 12:53:26,723 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.0) internal successors, (118), 58 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 122 [2022-03-20 12:53:26,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:53:26,724 INFO L225 Difference]: With dead ends: 132 [2022-03-20 12:53:26,724 INFO L226 Difference]: Without dead ends: 126 [2022-03-20 12:53:26,726 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 189 SyntacticMatches, 0 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1869 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=12998, Invalid=16414, Unknown=0, NotChecked=0, Total=29412 [2022-03-20 12:53:26,726 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 120 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:53:26,726 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [120 Valid, 49 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:53:26,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-03-20 12:53:26,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2022-03-20 12:53:26,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 120 states have (on average 1.0083333333333333) internal successors, (121), 120 states have internal predecessors, (121), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:53:26,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2022-03-20 12:53:26,753 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 122 [2022-03-20 12:53:26,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:53:26,753 INFO L478 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2022-03-20 12:53:26,753 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.0) internal successors, (118), 58 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:53:26,753 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2022-03-20 12:53:26,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-03-20 12:53:26,754 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:53:26,754 INFO L499 BasicCegarLoop]: trace histogram [56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:53:26,773 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2022-03-20 12:53:26,954 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,56 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:53:26,955 INFO L403 AbstractCegarLoop]: === Iteration 58 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:53:26,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:53:26,955 INFO L85 PathProgramCache]: Analyzing trace with hash -1797417814, now seen corresponding path program 111 times [2022-03-20 12:53:26,955 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:53:26,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [512580412] [2022-03-20 12:53:26,956 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:53:26,956 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:53:26,956 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:53:26,956 INFO L85 PathProgramCache]: Analyzing trace with hash -1797417814, now seen corresponding path program 112 times [2022-03-20 12:53:26,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:53:26,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [406174944] [2022-03-20 12:53:26,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:53:26,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:53:26,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:53:28,182 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:53:28,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:53:28,184 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:53:28,184 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:53:28,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [406174944] [2022-03-20 12:53:28,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [406174944] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:53:28,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [229819181] [2022-03-20 12:53:28,185 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:53:28,185 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:53:28,185 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:53:28,187 INFO L229 MonitoredProcess]: Starting monitored process 57 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:53:28,187 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2022-03-20 12:53:28,561 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:53:28,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:53:28,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 590 conjuncts, 58 conjunts are in the unsatisfiable core [2022-03-20 12:53:28,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:53:28,759 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:53:28,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:53:31,865 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:53:31,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [229819181] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:53:31,865 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:53:31,865 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 59, 59] total 118 [2022-03-20 12:53:31,865 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:53:31,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [512580412] [2022-03-20 12:53:31,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [512580412] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:53:31,866 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:53:31,866 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2022-03-20 12:53:31,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031222709] [2022-03-20 12:53:31,866 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:53:31,866 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-03-20 12:53:31,866 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:53:31,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-03-20 12:53:31,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6788, Invalid=7018, Unknown=0, NotChecked=0, Total=13806 [2022-03-20 12:53:31,868 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand has 60 states, 60 states have (on average 2.0) internal successors, (120), 59 states have internal predecessors, (120), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:53:33,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:53:33,260 INFO L93 Difference]: Finished difference Result 134 states and 134 transitions. [2022-03-20 12:53:33,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-03-20 12:53:33,260 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.0) internal successors, (120), 59 states have internal predecessors, (120), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 124 [2022-03-20 12:53:33,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:53:33,261 INFO L225 Difference]: With dead ends: 134 [2022-03-20 12:53:33,261 INFO L226 Difference]: Without dead ends: 128 [2022-03-20 12:53:33,263 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 192 SyntacticMatches, 0 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1931 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=13458, Invalid=16992, Unknown=0, NotChecked=0, Total=30450 [2022-03-20 12:53:33,263 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 122 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:53:33,263 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [122 Valid, 24 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:53:33,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2022-03-20 12:53:33,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2022-03-20 12:53:33,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0081967213114753) internal successors, (123), 122 states have internal predecessors, (123), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:53:33,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2022-03-20 12:53:33,288 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 124 [2022-03-20 12:53:33,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:53:33,288 INFO L478 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2022-03-20 12:53:33,288 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 2.0) internal successors, (120), 59 states have internal predecessors, (120), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:53:33,288 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2022-03-20 12:53:33,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2022-03-20 12:53:33,289 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:53:33,289 INFO L499 BasicCegarLoop]: trace histogram [57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:53:33,319 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2022-03-20 12:53:33,515 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,57 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:53:33,515 INFO L403 AbstractCegarLoop]: === Iteration 59 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:53:33,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:53:33,516 INFO L85 PathProgramCache]: Analyzing trace with hash -1615753652, now seen corresponding path program 113 times [2022-03-20 12:53:33,516 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:53:33,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1488663404] [2022-03-20 12:53:33,517 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:53:33,517 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:53:33,517 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:53:33,517 INFO L85 PathProgramCache]: Analyzing trace with hash -1615753652, now seen corresponding path program 114 times [2022-03-20 12:53:33,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:53:33,517 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190861327] [2022-03-20 12:53:33,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:53:33,517 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:53:33,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:53:34,757 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:53:34,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:53:34,760 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 0 proven. 3249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:53:34,760 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:53:34,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190861327] [2022-03-20 12:53:34,760 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [190861327] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:53:34,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284901149] [2022-03-20 12:53:34,760 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:53:34,761 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:53:34,761 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:53:34,763 INFO L229 MonitoredProcess]: Starting monitored process 58 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:53:34,763 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2022-03-20 12:54:41,383 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 58 check-sat command(s) [2022-03-20 12:54:41,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:54:41,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 599 conjuncts, 59 conjunts are in the unsatisfiable core [2022-03-20 12:54:41,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:54:41,668 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 0 proven. 3249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:54:41,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:54:44,899 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 0 proven. 3249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:54:44,899 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1284901149] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:54:44,899 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:54:44,899 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 60, 60] total 120 [2022-03-20 12:54:44,899 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:54:44,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1488663404] [2022-03-20 12:54:44,899 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1488663404] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:54:44,899 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:54:44,899 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2022-03-20 12:54:44,900 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301816071] [2022-03-20 12:54:44,900 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:54:44,900 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-03-20 12:54:44,900 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:54:44,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-03-20 12:54:44,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7023, Invalid=7257, Unknown=0, NotChecked=0, Total=14280 [2022-03-20 12:54:44,901 INFO L87 Difference]: Start difference. First operand 127 states and 127 transitions. Second operand has 61 states, 61 states have (on average 2.0) internal successors, (122), 60 states have internal predecessors, (122), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:54:46,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:54:46,391 INFO L93 Difference]: Finished difference Result 136 states and 136 transitions. [2022-03-20 12:54:46,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2022-03-20 12:54:46,391 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.0) internal successors, (122), 60 states have internal predecessors, (122), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 126 [2022-03-20 12:54:46,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:54:46,392 INFO L225 Difference]: With dead ends: 136 [2022-03-20 12:54:46,392 INFO L226 Difference]: Without dead ends: 130 [2022-03-20 12:54:46,394 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 371 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1994 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=13926, Invalid=17580, Unknown=0, NotChecked=0, Total=31506 [2022-03-20 12:54:46,394 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 124 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:54:46,394 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [124 Valid, 39 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:54:46,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-03-20 12:54:46,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2022-03-20 12:54:46,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 124 states have (on average 1.0080645161290323) internal successors, (125), 124 states have internal predecessors, (125), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:54:46,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2022-03-20 12:54:46,421 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 126 [2022-03-20 12:54:46,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:54:46,421 INFO L478 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2022-03-20 12:54:46,421 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.0) internal successors, (122), 60 states have internal predecessors, (122), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:54:46,421 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2022-03-20 12:54:46,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2022-03-20 12:54:46,422 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:54:46,422 INFO L499 BasicCegarLoop]: trace histogram [58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:54:46,462 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Ended with exit code 0 [2022-03-20 12:54:46,623 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2022-03-20 12:54:46,624 INFO L403 AbstractCegarLoop]: === Iteration 60 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:54:46,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:54:46,624 INFO L85 PathProgramCache]: Analyzing trace with hash 1164814190, now seen corresponding path program 115 times [2022-03-20 12:54:46,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:54:46,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1122906204] [2022-03-20 12:54:46,625 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:54:46,625 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:54:46,625 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:54:46,625 INFO L85 PathProgramCache]: Analyzing trace with hash 1164814190, now seen corresponding path program 116 times [2022-03-20 12:54:46,626 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:54:46,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255344968] [2022-03-20 12:54:46,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:54:46,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:54:46,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:54:47,818 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:54:47,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:54:47,820 INFO L134 CoverageAnalysis]: Checked inductivity of 3364 backedges. 0 proven. 3364 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:54:47,820 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:54:47,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255344968] [2022-03-20 12:54:47,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255344968] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:54:47,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394156837] [2022-03-20 12:54:47,821 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:54:47,821 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:54:47,821 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:54:47,822 INFO L229 MonitoredProcess]: Starting monitored process 59 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:54:47,823 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2022-03-20 12:54:48,217 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:54:48,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:54:48,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 608 conjuncts, 60 conjunts are in the unsatisfiable core [2022-03-20 12:54:48,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:54:48,417 INFO L134 CoverageAnalysis]: Checked inductivity of 3364 backedges. 0 proven. 3364 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:54:48,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:54:51,717 INFO L134 CoverageAnalysis]: Checked inductivity of 3364 backedges. 0 proven. 3364 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:54:51,717 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [394156837] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:54:51,717 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:54:51,717 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 61, 61] total 122 [2022-03-20 12:54:51,718 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:54:51,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1122906204] [2022-03-20 12:54:51,718 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1122906204] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:54:51,718 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:54:51,718 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2022-03-20 12:54:51,718 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068863610] [2022-03-20 12:54:51,718 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:54:51,718 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-03-20 12:54:51,718 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:54:51,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-03-20 12:54:51,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7262, Invalid=7500, Unknown=0, NotChecked=0, Total=14762 [2022-03-20 12:54:51,720 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand has 62 states, 62 states have (on average 2.0) internal successors, (124), 61 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:54:53,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:54:53,238 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2022-03-20 12:54:53,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-03-20 12:54:53,238 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.0) internal successors, (124), 61 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 128 [2022-03-20 12:54:53,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:54:53,239 INFO L225 Difference]: With dead ends: 138 [2022-03-20 12:54:53,239 INFO L226 Difference]: Without dead ends: 132 [2022-03-20 12:54:53,241 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2058 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=14402, Invalid=18178, Unknown=0, NotChecked=0, Total=32580 [2022-03-20 12:54:53,241 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 126 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:54:53,241 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 39 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:54:53,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2022-03-20 12:54:53,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2022-03-20 12:54:53,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 126 states have (on average 1.007936507936508) internal successors, (127), 126 states have internal predecessors, (127), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:54:53,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 131 transitions. [2022-03-20 12:54:53,274 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 131 transitions. Word has length 128 [2022-03-20 12:54:53,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:54:53,274 INFO L478 AbstractCegarLoop]: Abstraction has 131 states and 131 transitions. [2022-03-20 12:54:53,275 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.0) internal successors, (124), 61 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:54:53,275 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 131 transitions. [2022-03-20 12:54:53,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-03-20 12:54:53,275 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:54:53,275 INFO L499 BasicCegarLoop]: trace histogram [59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:54:53,297 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2022-03-20 12:54:53,483 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2022-03-20 12:54:53,483 INFO L403 AbstractCegarLoop]: === Iteration 61 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:54:53,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:54:53,484 INFO L85 PathProgramCache]: Analyzing trace with hash 1820852240, now seen corresponding path program 117 times [2022-03-20 12:54:53,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:54:53,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [226124671] [2022-03-20 12:54:53,485 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:54:53,485 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:54:53,485 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:54:53,486 INFO L85 PathProgramCache]: Analyzing trace with hash 1820852240, now seen corresponding path program 118 times [2022-03-20 12:54:53,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:54:53,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [260925495] [2022-03-20 12:54:53,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:54:53,486 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:54:53,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:54:54,740 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:54:54,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:54:54,743 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 0 proven. 3481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:54:54,743 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:54:54,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [260925495] [2022-03-20 12:54:54,743 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [260925495] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:54:54,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1093009387] [2022-03-20 12:54:54,743 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:54:54,743 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:54:54,744 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:54:54,745 INFO L229 MonitoredProcess]: Starting monitored process 60 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:54:54,745 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2022-03-20 12:54:55,170 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:54:55,170 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:54:55,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 617 conjuncts, 61 conjunts are in the unsatisfiable core [2022-03-20 12:54:55,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:54:55,370 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 0 proven. 3481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:54:55,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:54:58,801 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 0 proven. 3481 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:54:58,801 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1093009387] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:54:58,801 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:54:58,802 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 124 [2022-03-20 12:54:58,802 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:54:58,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [226124671] [2022-03-20 12:54:58,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [226124671] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:54:58,802 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:54:58,802 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2022-03-20 12:54:58,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109390888] [2022-03-20 12:54:58,802 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:54:58,802 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-03-20 12:54:58,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:54:58,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-03-20 12:54:58,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7505, Invalid=7747, Unknown=0, NotChecked=0, Total=15252 [2022-03-20 12:54:58,805 INFO L87 Difference]: Start difference. First operand 131 states and 131 transitions. Second operand has 63 states, 63 states have (on average 2.0) internal successors, (126), 62 states have internal predecessors, (126), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:55:00,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:55:00,374 INFO L93 Difference]: Finished difference Result 140 states and 140 transitions. [2022-03-20 12:55:00,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-03-20 12:55:00,374 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.0) internal successors, (126), 62 states have internal predecessors, (126), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 130 [2022-03-20 12:55:00,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:55:00,375 INFO L225 Difference]: With dead ends: 140 [2022-03-20 12:55:00,375 INFO L226 Difference]: Without dead ends: 134 [2022-03-20 12:55:00,377 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 201 SyntacticMatches, 0 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2123 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=14886, Invalid=18786, Unknown=0, NotChecked=0, Total=33672 [2022-03-20 12:55:00,377 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 128 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:55:00,377 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [128 Valid, 39 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:55:00,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2022-03-20 12:55:00,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2022-03-20 12:55:00,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0078125) internal successors, (129), 128 states have internal predecessors, (129), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:55:00,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 133 transitions. [2022-03-20 12:55:00,400 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 133 transitions. Word has length 130 [2022-03-20 12:55:00,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:55:00,400 INFO L478 AbstractCegarLoop]: Abstraction has 133 states and 133 transitions. [2022-03-20 12:55:00,401 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 2.0) internal successors, (126), 62 states have internal predecessors, (126), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:55:00,401 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 133 transitions. [2022-03-20 12:55:00,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2022-03-20 12:55:00,401 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:55:00,401 INFO L499 BasicCegarLoop]: trace histogram [60, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:55:00,421 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2022-03-20 12:55:00,604 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,60 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:55:00,604 INFO L403 AbstractCegarLoop]: === Iteration 62 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:55:00,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:55:00,605 INFO L85 PathProgramCache]: Analyzing trace with hash 913225778, now seen corresponding path program 119 times [2022-03-20 12:55:00,605 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:55:00,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [678682227] [2022-03-20 12:55:00,606 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:55:00,606 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:55:00,606 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:55:00,606 INFO L85 PathProgramCache]: Analyzing trace with hash 913225778, now seen corresponding path program 120 times [2022-03-20 12:55:00,606 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:55:00,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517734866] [2022-03-20 12:55:00,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:55:00,606 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:55:00,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:55:01,905 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:55:01,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:55:01,908 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:55:01,908 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:55:01,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517734866] [2022-03-20 12:55:01,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1517734866] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:55:01,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [258087729] [2022-03-20 12:55:01,908 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:55:01,908 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:55:01,908 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:55:01,909 INFO L229 MonitoredProcess]: Starting monitored process 61 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:55:01,910 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2022-03-20 12:56:31,800 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 61 check-sat command(s) [2022-03-20 12:56:31,800 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:56:31,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 626 conjuncts, 62 conjunts are in the unsatisfiable core [2022-03-20 12:56:31,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:56:32,101 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:56:32,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:56:35,631 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:56:35,631 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [258087729] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:56:35,631 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:56:35,631 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 63, 63] total 126 [2022-03-20 12:56:35,631 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:56:35,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [678682227] [2022-03-20 12:56:35,632 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [678682227] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:56:35,632 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:56:35,632 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2022-03-20 12:56:35,632 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783492594] [2022-03-20 12:56:35,632 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:56:35,632 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-03-20 12:56:35,632 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:56:35,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-03-20 12:56:35,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7752, Invalid=7998, Unknown=0, NotChecked=0, Total=15750 [2022-03-20 12:56:35,633 INFO L87 Difference]: Start difference. First operand 133 states and 133 transitions. Second operand has 64 states, 64 states have (on average 2.0) internal successors, (128), 63 states have internal predecessors, (128), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:56:37,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:56:37,238 INFO L93 Difference]: Finished difference Result 142 states and 142 transitions. [2022-03-20 12:56:37,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-03-20 12:56:37,239 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.0) internal successors, (128), 63 states have internal predecessors, (128), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 132 [2022-03-20 12:56:37,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:56:37,239 INFO L225 Difference]: With dead ends: 142 [2022-03-20 12:56:37,239 INFO L226 Difference]: Without dead ends: 136 [2022-03-20 12:56:37,242 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 389 GetRequests, 204 SyntacticMatches, 0 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2189 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=15378, Invalid=19404, Unknown=0, NotChecked=0, Total=34782 [2022-03-20 12:56:37,242 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 130 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:56:37,242 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 29 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:56:37,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-03-20 12:56:37,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2022-03-20 12:56:37,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 130 states have (on average 1.0076923076923077) internal successors, (131), 130 states have internal predecessors, (131), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:56:37,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 135 transitions. [2022-03-20 12:56:37,269 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 135 transitions. Word has length 132 [2022-03-20 12:56:37,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:56:37,269 INFO L478 AbstractCegarLoop]: Abstraction has 135 states and 135 transitions. [2022-03-20 12:56:37,269 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.0) internal successors, (128), 63 states have internal predecessors, (128), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:56:37,269 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 135 transitions. [2022-03-20 12:56:37,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2022-03-20 12:56:37,270 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:56:37,270 INFO L499 BasicCegarLoop]: trace histogram [61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:56:37,315 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2022-03-20 12:56:37,470 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,61 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:56:37,470 INFO L403 AbstractCegarLoop]: === Iteration 63 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:56:37,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:56:37,471 INFO L85 PathProgramCache]: Analyzing trace with hash 562556884, now seen corresponding path program 121 times [2022-03-20 12:56:37,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:56:37,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [122660278] [2022-03-20 12:56:37,472 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:56:37,472 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:56:37,472 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:56:37,472 INFO L85 PathProgramCache]: Analyzing trace with hash 562556884, now seen corresponding path program 122 times [2022-03-20 12:56:37,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:56:37,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [703150559] [2022-03-20 12:56:37,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:56:37,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:56:37,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:56:38,815 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:56:38,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:56:38,818 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 0 proven. 3721 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:56:38,818 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:56:38,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [703150559] [2022-03-20 12:56:38,818 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [703150559] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:56:38,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1760726985] [2022-03-20 12:56:38,818 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 12:56:38,818 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:56:38,818 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:56:38,820 INFO L229 MonitoredProcess]: Starting monitored process 62 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:56:38,820 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2022-03-20 12:56:39,257 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 12:56:39,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:56:39,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 635 conjuncts, 63 conjunts are in the unsatisfiable core [2022-03-20 12:56:39,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:56:39,482 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 0 proven. 3721 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:56:39,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:56:43,106 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 0 proven. 3721 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:56:43,106 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1760726985] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:56:43,106 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:56:43,107 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 64, 64] total 128 [2022-03-20 12:56:43,107 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:56:43,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [122660278] [2022-03-20 12:56:43,107 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [122660278] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:56:43,107 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:56:43,107 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2022-03-20 12:56:43,107 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383033041] [2022-03-20 12:56:43,107 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:56:43,107 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-03-20 12:56:43,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:56:43,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-03-20 12:56:43,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8003, Invalid=8253, Unknown=0, NotChecked=0, Total=16256 [2022-03-20 12:56:43,110 INFO L87 Difference]: Start difference. First operand 135 states and 135 transitions. Second operand has 65 states, 65 states have (on average 2.0) internal successors, (130), 64 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:56:44,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:56:44,747 INFO L93 Difference]: Finished difference Result 144 states and 144 transitions. [2022-03-20 12:56:44,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-03-20 12:56:44,752 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.0) internal successors, (130), 64 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 134 [2022-03-20 12:56:44,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:56:44,752 INFO L225 Difference]: With dead ends: 144 [2022-03-20 12:56:44,753 INFO L226 Difference]: Without dead ends: 138 [2022-03-20 12:56:44,754 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 207 SyntacticMatches, 0 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2256 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=15878, Invalid=20032, Unknown=0, NotChecked=0, Total=35910 [2022-03-20 12:56:44,755 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 132 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:56:44,755 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 34 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:56:44,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-03-20 12:56:44,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 137. [2022-03-20 12:56:44,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 132 states have (on average 1.0075757575757576) internal successors, (133), 132 states have internal predecessors, (133), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:56:44,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 137 transitions. [2022-03-20 12:56:44,783 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 137 transitions. Word has length 134 [2022-03-20 12:56:44,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:56:44,783 INFO L478 AbstractCegarLoop]: Abstraction has 137 states and 137 transitions. [2022-03-20 12:56:44,783 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 2.0) internal successors, (130), 64 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:56:44,783 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 137 transitions. [2022-03-20 12:56:44,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2022-03-20 12:56:44,783 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:56:44,784 INFO L499 BasicCegarLoop]: trace histogram [62, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:56:44,803 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2022-03-20 12:56:44,985 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,62 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:56:44,985 INFO L403 AbstractCegarLoop]: === Iteration 64 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:56:44,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:56:44,985 INFO L85 PathProgramCache]: Analyzing trace with hash -1422801162, now seen corresponding path program 123 times [2022-03-20 12:56:44,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:56:44,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1492044924] [2022-03-20 12:56:44,986 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:56:44,986 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:56:44,987 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:56:44,987 INFO L85 PathProgramCache]: Analyzing trace with hash -1422801162, now seen corresponding path program 124 times [2022-03-20 12:56:44,987 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:56:44,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1936062449] [2022-03-20 12:56:44,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:56:44,987 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:56:45,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:56:46,311 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:56:46,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:56:46,314 INFO L134 CoverageAnalysis]: Checked inductivity of 3844 backedges. 0 proven. 3844 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:56:46,314 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:56:46,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1936062449] [2022-03-20 12:56:46,315 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1936062449] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:56:46,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1040216849] [2022-03-20 12:56:46,315 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 12:56:46,315 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:56:46,315 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:56:46,316 INFO L229 MonitoredProcess]: Starting monitored process 63 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:56:46,317 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2022-03-20 12:56:46,753 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 12:56:46,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 12:56:46,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 64 conjunts are in the unsatisfiable core [2022-03-20 12:56:46,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 12:56:46,998 INFO L134 CoverageAnalysis]: Checked inductivity of 3844 backedges. 0 proven. 3844 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:56:46,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 12:56:50,728 INFO L134 CoverageAnalysis]: Checked inductivity of 3844 backedges. 0 proven. 3844 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:56:50,728 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1040216849] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 12:56:50,729 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 12:56:50,729 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 65, 65] total 130 [2022-03-20 12:56:50,729 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 12:56:50,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1492044924] [2022-03-20 12:56:50,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1492044924] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 12:56:50,729 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 12:56:50,729 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2022-03-20 12:56:50,729 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863795641] [2022-03-20 12:56:50,729 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 12:56:50,730 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-03-20 12:56:50,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 12:56:50,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-03-20 12:56:50,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8258, Invalid=8512, Unknown=0, NotChecked=0, Total=16770 [2022-03-20 12:56:50,732 INFO L87 Difference]: Start difference. First operand 137 states and 137 transitions. Second operand has 66 states, 66 states have (on average 2.0) internal successors, (132), 65 states have internal predecessors, (132), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:56:52,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 12:56:52,430 INFO L93 Difference]: Finished difference Result 146 states and 146 transitions. [2022-03-20 12:56:52,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-03-20 12:56:52,431 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.0) internal successors, (132), 65 states have internal predecessors, (132), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 136 [2022-03-20 12:56:52,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 12:56:52,432 INFO L225 Difference]: With dead ends: 146 [2022-03-20 12:56:52,432 INFO L226 Difference]: Without dead ends: 140 [2022-03-20 12:56:52,435 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2324 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=16386, Invalid=20670, Unknown=0, NotChecked=0, Total=37056 [2022-03-20 12:56:52,435 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 134 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 12:56:52,435 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 29 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 12:56:52,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-03-20 12:56:52,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2022-03-20 12:56:52,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.007462686567164) internal successors, (135), 134 states have internal predecessors, (135), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:56:52,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 139 transitions. [2022-03-20 12:56:52,474 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 139 transitions. Word has length 136 [2022-03-20 12:56:52,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 12:56:52,474 INFO L478 AbstractCegarLoop]: Abstraction has 139 states and 139 transitions. [2022-03-20 12:56:52,475 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 2.0) internal successors, (132), 65 states have internal predecessors, (132), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 12:56:52,475 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 139 transitions. [2022-03-20 12:56:52,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2022-03-20 12:56:52,475 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 12:56:52,475 INFO L499 BasicCegarLoop]: trace histogram [63, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 12:56:52,495 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Ended with exit code 0 [2022-03-20 12:56:52,676 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,63 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:56:52,676 INFO L403 AbstractCegarLoop]: === Iteration 65 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 12:56:52,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 12:56:52,676 INFO L85 PathProgramCache]: Analyzing trace with hash 1908563352, now seen corresponding path program 125 times [2022-03-20 12:56:52,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 12:56:52,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [346595358] [2022-03-20 12:56:52,678 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 12:56:52,678 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 12:56:52,678 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 12:56:52,678 INFO L85 PathProgramCache]: Analyzing trace with hash 1908563352, now seen corresponding path program 126 times [2022-03-20 12:56:52,678 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 12:56:52,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1601097571] [2022-03-20 12:56:52,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 12:56:52,678 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 12:56:52,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:56:54,102 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 12:56:54,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 12:56:54,105 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 0 proven. 3969 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 12:56:54,105 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 12:56:54,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1601097571] [2022-03-20 12:56:54,106 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1601097571] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 12:56:54,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1741809313] [2022-03-20 12:56:54,106 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 12:56:54,106 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 12:56:54,106 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 12:56:54,108 INFO L229 MonitoredProcess]: Starting monitored process 64 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 12:56:54,109 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2022-03-20 13:00:24,111 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 64 check-sat command(s) [2022-03-20 13:00:24,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:00:24,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 653 conjuncts, 65 conjunts are in the unsatisfiable core [2022-03-20 13:00:24,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:00:24,572 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 0 proven. 3969 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:00:24,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:00:28,511 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 0 proven. 3969 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:00:28,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1741809313] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:00:28,511 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:00:28,511 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 66, 66] total 132 [2022-03-20 13:00:28,511 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:00:28,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [346595358] [2022-03-20 13:00:28,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [346595358] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:00:28,512 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:00:28,512 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [67] imperfect sequences [] total 67 [2022-03-20 13:00:28,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471074736] [2022-03-20 13:00:28,512 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:00:28,512 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-03-20 13:00:28,512 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:00:28,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-03-20 13:00:28,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8517, Invalid=8775, Unknown=0, NotChecked=0, Total=17292 [2022-03-20 13:00:28,514 INFO L87 Difference]: Start difference. First operand 139 states and 139 transitions. Second operand has 67 states, 67 states have (on average 2.0) internal successors, (134), 66 states have internal predecessors, (134), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 13:00:30,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:00:30,280 INFO L93 Difference]: Finished difference Result 148 states and 148 transitions. [2022-03-20 13:00:30,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2022-03-20 13:00:30,281 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.0) internal successors, (134), 66 states have internal predecessors, (134), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 138 [2022-03-20 13:00:30,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:00:30,282 INFO L225 Difference]: With dead ends: 148 [2022-03-20 13:00:30,282 INFO L226 Difference]: Without dead ends: 142 [2022-03-20 13:00:30,284 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 407 GetRequests, 213 SyntacticMatches, 0 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2393 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=16902, Invalid=21318, Unknown=0, NotChecked=0, Total=38220 [2022-03-20 13:00:30,284 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 136 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 13:00:30,285 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 49 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 173 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 13:00:30,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-03-20 13:00:30,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2022-03-20 13:00:30,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 136 states have (on average 1.0073529411764706) internal successors, (137), 136 states have internal predecessors, (137), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 13:00:30,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 141 transitions. [2022-03-20 13:00:30,321 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 141 transitions. Word has length 138 [2022-03-20 13:00:30,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:00:30,321 INFO L478 AbstractCegarLoop]: Abstraction has 141 states and 141 transitions. [2022-03-20 13:00:30,321 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 2.0) internal successors, (134), 66 states have internal predecessors, (134), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 13:00:30,321 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 141 transitions. [2022-03-20 13:00:30,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2022-03-20 13:00:30,322 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:00:30,322 INFO L499 BasicCegarLoop]: trace histogram [64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:00:30,383 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2022-03-20 13:00:30,522 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2022-03-20 13:00:30,522 INFO L403 AbstractCegarLoop]: === Iteration 66 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:00:30,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:00:30,523 INFO L85 PathProgramCache]: Analyzing trace with hash -695741510, now seen corresponding path program 127 times [2022-03-20 13:00:30,523 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:00:30,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1931988628] [2022-03-20 13:00:30,524 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:00:30,524 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 13:00:30,524 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:00:30,524 INFO L85 PathProgramCache]: Analyzing trace with hash -695741510, now seen corresponding path program 128 times [2022-03-20 13:00:30,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:00:30,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [98889148] [2022-03-20 13:00:30,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:00:30,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:00:30,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:00:31,945 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:00:31,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:00:31,948 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 0 proven. 4096 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:00:31,948 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:00:31,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [98889148] [2022-03-20 13:00:31,948 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [98889148] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:00:31,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47416386] [2022-03-20 13:00:31,948 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:00:31,948 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:00:31,948 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:00:31,949 INFO L229 MonitoredProcess]: Starting monitored process 65 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:00:31,950 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2022-03-20 13:00:32,433 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 13:00:32,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:00:32,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 662 conjuncts, 66 conjunts are in the unsatisfiable core [2022-03-20 13:00:32,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:00:32,646 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 0 proven. 4096 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:00:32,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:00:36,671 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 0 proven. 4096 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:00:36,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47416386] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:00:36,671 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:00:36,672 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 67, 67] total 134 [2022-03-20 13:00:36,672 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:00:36,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1931988628] [2022-03-20 13:00:36,672 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1931988628] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:00:36,672 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:00:36,672 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2022-03-20 13:00:36,672 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598691658] [2022-03-20 13:00:36,672 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:00:36,672 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-03-20 13:00:36,672 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:00:36,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-03-20 13:00:36,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8780, Invalid=9042, Unknown=0, NotChecked=0, Total=17822 [2022-03-20 13:00:36,674 INFO L87 Difference]: Start difference. First operand 141 states and 141 transitions. Second operand has 68 states, 68 states have (on average 2.0) internal successors, (136), 67 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 13:00:38,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:00:38,448 INFO L93 Difference]: Finished difference Result 150 states and 150 transitions. [2022-03-20 13:00:38,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-03-20 13:00:38,448 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 2.0) internal successors, (136), 67 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 140 [2022-03-20 13:00:38,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:00:38,449 INFO L225 Difference]: With dead ends: 150 [2022-03-20 13:00:38,449 INFO L226 Difference]: Without dead ends: 144 [2022-03-20 13:00:38,451 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 216 SyntacticMatches, 0 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2463 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=17426, Invalid=21976, Unknown=0, NotChecked=0, Total=39402 [2022-03-20 13:00:38,452 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 138 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 13:00:38,452 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 44 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 13:00:38,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2022-03-20 13:00:38,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 143. [2022-03-20 13:00:38,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 138 states have (on average 1.0072463768115942) internal successors, (139), 138 states have internal predecessors, (139), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 13:00:38,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 143 transitions. [2022-03-20 13:00:38,487 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 143 transitions. Word has length 140 [2022-03-20 13:00:38,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:00:38,488 INFO L478 AbstractCegarLoop]: Abstraction has 143 states and 143 transitions. [2022-03-20 13:00:38,488 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 2.0) internal successors, (136), 67 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-20 13:00:38,488 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 143 transitions. [2022-03-20 13:00:38,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2022-03-20 13:00:38,488 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:00:38,488 INFO L499 BasicCegarLoop]: trace histogram [65, 65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:00:38,509 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2022-03-20 13:00:38,689 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,65 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:00:38,689 INFO L403 AbstractCegarLoop]: === Iteration 67 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:00:38,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:00:38,689 INFO L85 PathProgramCache]: Analyzing trace with hash 533219676, now seen corresponding path program 129 times [2022-03-20 13:00:38,689 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:00:38,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [367364076] [2022-03-20 13:00:38,690 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:00:38,691 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-03-20 13:00:38,691 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:00:38,691 INFO L85 PathProgramCache]: Analyzing trace with hash 533219676, now seen corresponding path program 130 times [2022-03-20 13:00:38,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:00:38,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1098642892] [2022-03-20 13:00:38,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:00:38,691 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:00:38,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:00:40,178 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:00:40,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:00:40,181 INFO L134 CoverageAnalysis]: Checked inductivity of 4225 backedges. 0 proven. 4225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:00:40,181 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:00:40,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1098642892] [2022-03-20 13:00:40,182 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1098642892] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:00:40,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [667485519] [2022-03-20 13:00:40,182 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 13:00:40,182 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:00:40,182 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:00:40,183 INFO L229 MonitoredProcess]: Starting monitored process 66 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:00:40,184 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2022-03-20 13:00:40,668 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 13:00:40,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:00:40,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 671 conjuncts, 67 conjunts are in the unsatisfiable core [2022-03-20 13:00:40,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:00:40,889 INFO L134 CoverageAnalysis]: Checked inductivity of 4225 backedges. 0 proven. 4225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:00:40,889 INFO L328 TraceCheckSpWp]: Computing backward predicates...