/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/Mono1_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 18:39:08,158 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 18:39:08,159 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 18:39:08,180 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 18:39:08,213 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 18:39:08,223 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 18:39:08,224 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 18:39:08,225 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 18:39:08,225 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 18:39:08,225 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 18:39:08,226 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 18:39:08,226 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 18:39:08,226 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 18:39:08,226 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 18:39:08,226 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 18:39:08,226 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 18:39:08,227 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 18:39:08,227 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 18:39:08,227 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 18:39:08,227 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 18:39:08,227 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:39:08,227 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 18:39:08,227 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 18:39:08,227 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 18:39:08,227 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 18:39:08,227 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 18:39:08,227 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 18:39:08,228 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 18:39:08,428 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 18:39:08,444 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 18:39:08,445 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 18:39:08,446 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 18:39:08,450 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 18:39:08,451 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono1_1-2.c [2022-03-20 18:39:08,492 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d6dac8f87/172a655dc45f4bacb7d68825ec444adc/FLAG48427a442 [2022-03-20 18:39:08,818 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 18:39:08,819 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono1_1-2.c [2022-03-20 18:39:08,829 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d6dac8f87/172a655dc45f4bacb7d68825ec444adc/FLAG48427a442 [2022-03-20 18:39:08,839 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d6dac8f87/172a655dc45f4bacb7d68825ec444adc [2022-03-20 18:39:08,842 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 18:39:08,843 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 18:39:08,844 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 18:39:08,844 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 18:39:08,846 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 18:39:08,847 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:39:08" (1/1) ... [2022-03-20 18:39:08,848 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@76a84b35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:39:08, skipping insertion in model container [2022-03-20 18:39:08,848 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 06:39:08" (1/1) ... [2022-03-20 18:39:08,853 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 18:39:08,865 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 18:39:09,023 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono1_1-2.c[313,326] [2022-03-20 18:39:09,039 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:39:09,046 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 18:39:09,057 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono1_1-2.c[313,326] [2022-03-20 18:39:09,058 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 18:39:09,067 INFO L208 MainTranslator]: Completed translation [2022-03-20 18:39:09,067 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:39:09 WrapperNode [2022-03-20 18:39:09,067 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 18:39:09,068 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 18:39:09,068 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 18:39:09,069 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 18:39:09,076 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:39:09" (1/1) ... [2022-03-20 18:39:09,076 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:39:09" (1/1) ... [2022-03-20 18:39:09,082 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:39:09" (1/1) ... [2022-03-20 18:39:09,082 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:39:09" (1/1) ... [2022-03-20 18:39:09,086 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:39:09" (1/1) ... [2022-03-20 18:39:09,088 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:39:09" (1/1) ... [2022-03-20 18:39:09,095 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:39:09" (1/1) ... [2022-03-20 18:39:09,096 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 18:39:09,097 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 18:39:09,097 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 18:39:09,097 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 18:39:09,098 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:39:09" (1/1) ... [2022-03-20 18:39:09,103 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 18:39:09,110 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:09,120 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 18:39:09,136 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 18:39:09,152 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 18:39:09,152 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 18:39:09,152 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 18:39:09,153 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 18:39:09,153 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 18:39:09,153 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 18:39:09,153 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 18:39:09,153 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 18:39:09,153 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 18:39:09,153 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 18:39:09,153 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 18:39:09,154 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 18:39:09,154 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 18:39:09,154 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 18:39:09,154 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 18:39:09,155 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 18:39:09,155 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 18:39:09,200 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 18:39:09,201 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 18:39:09,317 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 18:39:09,320 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 18:39:09,321 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-20 18:39:09,322 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:39:09 BoogieIcfgContainer [2022-03-20 18:39:09,322 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 18:39:09,323 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 18:39:09,323 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 18:39:09,328 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 18:39:09,328 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 06:39:08" (1/3) ... [2022-03-20 18:39:09,329 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e01e88f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:39:09, skipping insertion in model container [2022-03-20 18:39:09,329 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 06:39:09" (2/3) ... [2022-03-20 18:39:09,329 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e01e88f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 06:39:09, skipping insertion in model container [2022-03-20 18:39:09,329 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 06:39:09" (3/3) ... [2022-03-20 18:39:09,330 INFO L111 eAbstractionObserver]: Analyzing ICFG Mono1_1-2.c [2022-03-20 18:39:09,334 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 18:39:09,334 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 18:39:09,369 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 18:39:09,377 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-20 18:39:09,377 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 18:39:09,389 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 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 18:39:09,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-03-20 18:39:09,403 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:09,403 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:09,404 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:09,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:09,408 INFO L85 PathProgramCache]: Analyzing trace with hash 491760044, now seen corresponding path program 1 times [2022-03-20 18:39:09,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:09,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [880731485] [2022-03-20 18:39:09,422 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:39:09,422 INFO L85 PathProgramCache]: Analyzing trace with hash 491760044, now seen corresponding path program 2 times [2022-03-20 18:39:09,424 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:09,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478444927] [2022-03-20 18:39:09,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:09,425 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:09,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:09,569 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:09,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:09,577 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:09,577 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:09,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478444927] [2022-03-20 18:39:09,578 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [478444927] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:09,578 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:09,578 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 18:39:09,580 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:09,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [880731485] [2022-03-20 18:39:09,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [880731485] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:09,581 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:09,581 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 18:39:09,581 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206884868] [2022-03-20 18:39:09,581 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:09,584 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 18:39:09,584 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:09,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 18:39:09,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 18:39:09,617 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 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 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 18:39:09,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:09,667 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2022-03-20 18:39:09,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 18:39:09,670 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 11 [2022-03-20 18:39:09,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:09,674 INFO L225 Difference]: With dead ends: 30 [2022-03-20 18:39:09,674 INFO L226 Difference]: Without dead ends: 13 [2022-03-20 18:39:09,676 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 18:39:09,678 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 11 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 22 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 18:39:09,679 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 22 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:39:09,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-03-20 18:39:09,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-03-20 18:39:09,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 8 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 18:39:09,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2022-03-20 18:39:09,711 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2022-03-20 18:39:09,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:09,711 INFO L478 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2022-03-20 18:39:09,712 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 18:39:09,712 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2022-03-20 18:39:09,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-03-20 18:39:09,713 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:09,713 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:09,713 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 18:39:09,713 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:09,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:09,714 INFO L85 PathProgramCache]: Analyzing trace with hash 482524834, now seen corresponding path program 1 times [2022-03-20 18:39:09,715 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:09,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1953037821] [2022-03-20 18:39:09,716 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 18:39:09,716 INFO L85 PathProgramCache]: Analyzing trace with hash 482524834, now seen corresponding path program 2 times [2022-03-20 18:39:09,717 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:09,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78980851] [2022-03-20 18:39:09,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:09,718 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:09,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:09,823 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:09,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:09,843 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:09,844 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:09,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78980851] [2022-03-20 18:39:09,846 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [78980851] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:09,846 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:09,846 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:39:09,846 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:09,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1953037821] [2022-03-20 18:39:09,846 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1953037821] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:09,847 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:09,847 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 18:39:09,847 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918776921] [2022-03-20 18:39:09,847 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:09,848 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 18:39:09,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:09,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 18:39:09,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 18:39:09,848 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 18:39:09,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:09,886 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2022-03-20 18:39:09,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 18:39:09,887 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 11 [2022-03-20 18:39:09,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:09,888 INFO L225 Difference]: With dead ends: 22 [2022-03-20 18:39:09,888 INFO L226 Difference]: Without dead ends: 15 [2022-03-20 18:39:09,888 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 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 18:39:09,891 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 10 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:09,892 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 19 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:39:09,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-03-20 18:39:09,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-03-20 18:39:09,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 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 18:39:09,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-03-20 18:39:09,906 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2022-03-20 18:39:09,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:09,906 INFO L478 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-03-20 18:39:09,906 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 18:39:09,906 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-03-20 18:39:09,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-03-20 18:39:09,907 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:09,907 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:09,907 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 18:39:09,908 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:09,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:09,908 INFO L85 PathProgramCache]: Analyzing trace with hash 925229631, now seen corresponding path program 1 times [2022-03-20 18:39:09,908 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:09,911 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [182166114] [2022-03-20 18:39:10,008 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 18:39:10,010 INFO L85 PathProgramCache]: Analyzing trace with hash -1303175503, now seen corresponding path program 1 times [2022-03-20 18:39:10,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:10,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1760105838] [2022-03-20 18:39:10,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:10,011 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:10,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:10,139 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:10,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:10,153 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:10,154 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:10,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1760105838] [2022-03-20 18:39:10,154 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1760105838] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:10,154 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:10,154 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 18:39:10,232 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:10,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [182166114] [2022-03-20 18:39:10,232 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [182166114] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:10,232 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:10,232 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 18:39:10,234 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203425121] [2022-03-20 18:39:10,234 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:10,234 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 18:39:10,234 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:10,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 18:39:10,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-03-20 18:39:10,235 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 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 18:39:10,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:10,338 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2022-03-20 18:39:10,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 18:39:10,339 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 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 13 [2022-03-20 18:39:10,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:10,339 INFO L225 Difference]: With dead ends: 22 [2022-03-20 18:39:10,339 INFO L226 Difference]: Without dead ends: 17 [2022-03-20 18:39:10,340 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2022-03-20 18:39:10,340 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 11 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:10,340 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 23 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:39:10,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-03-20 18:39:10,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-03-20 18:39:10,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 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 18:39:10,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-03-20 18:39:10,344 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2022-03-20 18:39:10,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:10,344 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-03-20 18:39:10,344 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 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 18:39:10,345 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-03-20 18:39:10,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-20 18:39:10,345 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:10,345 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:10,345 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 18:39:10,345 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:10,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:10,345 INFO L85 PathProgramCache]: Analyzing trace with hash 1220035546, now seen corresponding path program 1 times [2022-03-20 18:39:10,346 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:10,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2135927513] [2022-03-20 18:39:10,566 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:10,567 INFO L85 PathProgramCache]: Analyzing trace with hash -1244070159, now seen corresponding path program 1 times [2022-03-20 18:39:10,567 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:10,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1306089442] [2022-03-20 18:39:10,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:10,568 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:10,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:10,582 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:10,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:10,608 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:10,608 INFO L85 PathProgramCache]: Analyzing trace with hash 1220035546, now seen corresponding path program 2 times [2022-03-20 18:39:10,608 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:10,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [28806948] [2022-03-20 18:39:10,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:10,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:10,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:10,661 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:10,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:10,670 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:10,671 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:10,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [28806948] [2022-03-20 18:39:10,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [28806948] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:10,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1095471796] [2022-03-20 18:39:10,671 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:39:10,671 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:10,671 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:10,673 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:10,674 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 18:39:10,707 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:39:10,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:10,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-20 18:39:10,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:10,754 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:10,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:10,811 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:10,811 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1095471796] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:10,811 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:10,812 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 5] total 9 [2022-03-20 18:39:10,821 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:10,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2135927513] [2022-03-20 18:39:10,821 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2135927513] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:10,821 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:10,821 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 18:39:10,821 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897785173] [2022-03-20 18:39:10,821 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:10,822 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 18:39:10,822 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:10,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 18:39:10,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2022-03-20 18:39:10,822 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 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 18:39:10,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:10,923 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2022-03-20 18:39:10,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 18:39:10,924 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 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 15 [2022-03-20 18:39:10,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:10,924 INFO L225 Difference]: With dead ends: 26 [2022-03-20 18:39:10,924 INFO L226 Difference]: Without dead ends: 19 [2022-03-20 18:39:10,925 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110 [2022-03-20 18:39:10,925 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 10 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 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, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:10,925 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 24 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:39:10,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-03-20 18:39:10,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-03-20 18:39:10,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 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 18:39:10,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-03-20 18:39:10,930 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2022-03-20 18:39:10,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:10,930 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-03-20 18:39:10,930 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 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 18:39:10,930 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-03-20 18:39:10,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-20 18:39:10,930 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:10,930 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:10,953 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 18:39:11,131 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:11,131 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:11,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:11,132 INFO L85 PathProgramCache]: Analyzing trace with hash 1870024951, now seen corresponding path program 3 times [2022-03-20 18:39:11,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:11,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [565530723] [2022-03-20 18:39:11,307 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:11,307 INFO L85 PathProgramCache]: Analyzing trace with hash -1184964815, now seen corresponding path program 1 times [2022-03-20 18:39:11,307 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:11,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854933186] [2022-03-20 18:39:11,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:11,308 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:11,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:11,338 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:11,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:11,348 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:11,348 INFO L85 PathProgramCache]: Analyzing trace with hash 1870024951, now seen corresponding path program 4 times [2022-03-20 18:39:11,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:11,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638404008] [2022-03-20 18:39:11,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:11,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:11,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:11,408 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:11,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:11,420 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:11,420 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:11,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638404008] [2022-03-20 18:39:11,420 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [638404008] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:11,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700719746] [2022-03-20 18:39:11,420 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:39:11,420 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:11,421 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:11,422 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:11,423 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 18:39:11,446 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:39:11,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:11,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-20 18:39:11,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:11,520 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:11,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:11,613 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:11,614 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1700719746] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:11,614 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:11,614 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 11 [2022-03-20 18:39:11,614 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:11,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [565530723] [2022-03-20 18:39:11,615 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [565530723] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:11,616 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:11,616 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 18:39:11,617 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956876638] [2022-03-20 18:39:11,618 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:11,618 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 18:39:11,618 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:11,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 18:39:11,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2022-03-20 18:39:11,620 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 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 18:39:11,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:11,672 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2022-03-20 18:39:11,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 18:39:11,673 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 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 17 [2022-03-20 18:39:11,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:11,673 INFO L225 Difference]: With dead ends: 28 [2022-03-20 18:39:11,673 INFO L226 Difference]: Without dead ends: 21 [2022-03-20 18:39:11,674 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=67, Invalid=115, Unknown=0, NotChecked=0, Total=182 [2022-03-20 18:39:11,675 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 11 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:11,675 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 29 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:39:11,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-03-20 18:39:11,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-03-20 18:39:11,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.1875) internal successors, (19), 16 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 18:39:11,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2022-03-20 18:39:11,686 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 17 [2022-03-20 18:39:11,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:11,686 INFO L478 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2022-03-20 18:39:11,686 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 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 18:39:11,686 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2022-03-20 18:39:11,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-20 18:39:11,687 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:11,687 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:11,723 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 18:39:11,910 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,SelfDestructingSolverStorable6,SelfDestructingSolverStorable5 [2022-03-20 18:39:11,910 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:11,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:11,910 INFO L85 PathProgramCache]: Analyzing trace with hash -555382060, now seen corresponding path program 5 times [2022-03-20 18:39:11,910 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:11,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [689091966] [2022-03-20 18:39:12,086 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:12,087 INFO L85 PathProgramCache]: Analyzing trace with hash -1125859471, now seen corresponding path program 1 times [2022-03-20 18:39:12,088 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:12,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444191286] [2022-03-20 18:39:12,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:12,088 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:12,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:12,098 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:12,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:12,105 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:12,105 INFO L85 PathProgramCache]: Analyzing trace with hash -555382060, now seen corresponding path program 6 times [2022-03-20 18:39:12,105 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:12,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [954281645] [2022-03-20 18:39:12,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:12,106 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:12,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:12,162 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:12,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:12,169 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:12,169 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:12,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [954281645] [2022-03-20 18:39:12,170 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [954281645] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:12,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1458768123] [2022-03-20 18:39:12,170 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:39:12,170 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:12,170 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:12,173 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:12,174 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 18:39:12,217 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-20 18:39:12,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:12,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-20 18:39:12,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:12,296 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 18:39:12,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:12,385 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 18:39:12,385 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1458768123] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:12,385 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:12,385 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 7] total 15 [2022-03-20 18:39:12,385 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:12,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [689091966] [2022-03-20 18:39:12,386 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [689091966] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:12,386 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:12,386 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 18:39:12,386 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87408399] [2022-03-20 18:39:12,386 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:12,386 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 18:39:12,386 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:12,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 18:39:12,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2022-03-20 18:39:12,387 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 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 18:39:12,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:12,453 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2022-03-20 18:39:12,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 18:39:12,453 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 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 19 [2022-03-20 18:39:12,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:12,454 INFO L225 Difference]: With dead ends: 30 [2022-03-20 18:39:12,454 INFO L226 Difference]: Without dead ends: 23 [2022-03-20 18:39:12,454 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2022-03-20 18:39:12,455 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 12 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:12,455 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 29 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:39:12,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-20 18:39:12,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-03-20 18:39:12,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 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 18:39:12,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-03-20 18:39:12,459 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 19 [2022-03-20 18:39:12,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:12,459 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-03-20 18:39:12,459 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 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 18:39:12,459 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-03-20 18:39:12,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-20 18:39:12,460 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:12,460 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:12,468 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 18:39:12,668 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,SelfDestructingSolverStorable7,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:12,668 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:12,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:12,668 INFO L85 PathProgramCache]: Analyzing trace with hash 795722097, now seen corresponding path program 7 times [2022-03-20 18:39:12,668 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:12,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1722306160] [2022-03-20 18:39:12,855 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:12,856 INFO L85 PathProgramCache]: Analyzing trace with hash -1066754127, now seen corresponding path program 1 times [2022-03-20 18:39:12,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:12,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608340470] [2022-03-20 18:39:12,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:12,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:12,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:12,865 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:12,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:12,872 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:12,872 INFO L85 PathProgramCache]: Analyzing trace with hash 795722097, now seen corresponding path program 8 times [2022-03-20 18:39:12,872 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:12,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [455698760] [2022-03-20 18:39:12,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:12,872 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:12,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:12,958 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:12,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:12,978 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:12,978 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:12,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [455698760] [2022-03-20 18:39:12,978 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [455698760] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:12,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1435900734] [2022-03-20 18:39:12,978 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:39:12,978 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:12,979 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:12,990 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:13,015 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 18:39:13,033 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:39:13,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:13,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 18:39:13,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:13,104 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 18:39:13,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:13,300 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 18:39:13,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1435900734] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:13,300 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:13,300 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 19 [2022-03-20 18:39:13,301 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:13,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1722306160] [2022-03-20 18:39:13,301 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1722306160] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:13,301 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:13,301 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 18:39:13,301 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294005229] [2022-03-20 18:39:13,301 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:13,301 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 18:39:13,301 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:13,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 18:39:13,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=259, Unknown=0, NotChecked=0, Total=342 [2022-03-20 18:39:13,302 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 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 18:39:13,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:13,374 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2022-03-20 18:39:13,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 18:39:13,375 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 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 21 [2022-03-20 18:39:13,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:13,375 INFO L225 Difference]: With dead ends: 32 [2022-03-20 18:39:13,375 INFO L226 Difference]: Without dead ends: 25 [2022-03-20 18:39:13,375 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=411, Unknown=0, NotChecked=0, Total=552 [2022-03-20 18:39:13,376 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 13 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:13,376 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 19 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:39:13,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-03-20 18:39:13,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-03-20 18:39:13,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 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 18:39:13,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-03-20 18:39:13,380 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 21 [2022-03-20 18:39:13,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:13,380 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-03-20 18:39:13,380 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 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 18:39:13,380 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-03-20 18:39:13,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-20 18:39:13,381 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:13,381 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:13,403 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 18:39:13,595 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,SelfDestructingSolverStorable9,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:13,595 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:13,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:13,596 INFO L85 PathProgramCache]: Analyzing trace with hash 2126693582, now seen corresponding path program 9 times [2022-03-20 18:39:13,596 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:13,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [934025291] [2022-03-20 18:39:13,719 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:13,720 INFO L85 PathProgramCache]: Analyzing trace with hash -1007648783, now seen corresponding path program 1 times [2022-03-20 18:39:13,720 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:13,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448672260] [2022-03-20 18:39:13,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:13,720 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:13,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:13,742 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:13,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:13,747 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:13,748 INFO L85 PathProgramCache]: Analyzing trace with hash 2126693582, now seen corresponding path program 10 times [2022-03-20 18:39:13,748 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:13,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953856919] [2022-03-20 18:39:13,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:13,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:13,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:13,824 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:13,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:13,829 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:13,829 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:13,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953856919] [2022-03-20 18:39:13,830 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [953856919] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:13,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1394666010] [2022-03-20 18:39:13,831 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:39:13,831 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:13,831 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:13,832 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:13,833 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 18:39:13,859 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:39:13,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:13,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-20 18:39:13,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:13,934 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:13,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:14,096 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:14,097 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1394666010] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:14,097 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:14,097 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 17 [2022-03-20 18:39:14,097 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:14,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [934025291] [2022-03-20 18:39:14,097 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [934025291] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:14,097 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:14,097 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 18:39:14,097 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525543731] [2022-03-20 18:39:14,097 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:14,098 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 18:39:14,098 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:14,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 18:39:14,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=185, Unknown=0, NotChecked=0, Total=272 [2022-03-20 18:39:14,098 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 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 18:39:14,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:14,190 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2022-03-20 18:39:14,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 18:39:14,191 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 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 23 [2022-03-20 18:39:14,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:14,191 INFO L225 Difference]: With dead ends: 34 [2022-03-20 18:39:14,191 INFO L226 Difference]: Without dead ends: 27 [2022-03-20 18:39:14,192 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=163, Invalid=343, Unknown=0, NotChecked=0, Total=506 [2022-03-20 18:39:14,192 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 14 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:14,192 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 29 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 18:39:14,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-03-20 18:39:14,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-03-20 18:39:14,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 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 18:39:14,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2022-03-20 18:39:14,196 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 23 [2022-03-20 18:39:14,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:14,197 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2022-03-20 18:39:14,197 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 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 18:39:14,197 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2022-03-20 18:39:14,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-20 18:39:14,197 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:14,197 INFO L499 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:14,216 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-20 18:39:14,413 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11,SelfDestructingSolverStorable12 [2022-03-20 18:39:14,414 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:14,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:14,414 INFO L85 PathProgramCache]: Analyzing trace with hash 1290036459, now seen corresponding path program 11 times [2022-03-20 18:39:14,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:14,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1240995892] [2022-03-20 18:39:14,556 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:14,557 INFO L85 PathProgramCache]: Analyzing trace with hash -948543439, now seen corresponding path program 1 times [2022-03-20 18:39:14,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:14,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [279706268] [2022-03-20 18:39:14,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:14,557 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:14,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:14,566 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:14,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:14,572 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:14,572 INFO L85 PathProgramCache]: Analyzing trace with hash 1290036459, now seen corresponding path program 12 times [2022-03-20 18:39:14,572 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:14,572 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2074793110] [2022-03-20 18:39:14,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:14,572 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:14,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:14,656 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:14,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:14,660 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:14,660 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:14,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2074793110] [2022-03-20 18:39:14,660 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2074793110] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:14,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2102531607] [2022-03-20 18:39:14,660 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:39:14,660 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:14,660 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:14,661 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:14,663 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-20 18:39:14,710 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:39:14,710 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:14,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-20 18:39:14,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:14,823 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 30 proven. 7 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 18:39:14,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:14,979 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 25 proven. 4 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-20 18:39:14,979 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2102531607] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:14,979 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:14,979 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6, 8] total 20 [2022-03-20 18:39:14,980 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:14,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1240995892] [2022-03-20 18:39:14,980 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1240995892] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:14,980 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:14,980 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 18:39:14,980 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128175155] [2022-03-20 18:39:14,980 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:14,980 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 18:39:14,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:14,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 18:39:14,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2022-03-20 18:39:14,981 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 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 18:39:15,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:15,102 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2022-03-20 18:39:15,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 18:39:15,102 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 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 25 [2022-03-20 18:39:15,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:15,103 INFO L225 Difference]: With dead ends: 36 [2022-03-20 18:39:15,103 INFO L226 Difference]: Without dead ends: 29 [2022-03-20 18:39:15,103 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=165, Invalid=537, Unknown=0, NotChecked=0, Total=702 [2022-03-20 18:39:15,103 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 15 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:15,104 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 39 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:39:15,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-20 18:39:15,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-03-20 18:39:15,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.125) internal successors, (27), 24 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 18:39:15,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2022-03-20 18:39:15,108 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 25 [2022-03-20 18:39:15,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:15,108 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2022-03-20 18:39:15,108 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 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 18:39:15,108 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2022-03-20 18:39:15,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-20 18:39:15,108 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:15,108 INFO L499 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:15,122 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-20 18:39:15,309 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-03-20 18:39:15,311 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:15,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:15,311 INFO L85 PathProgramCache]: Analyzing trace with hash 421425608, now seen corresponding path program 13 times [2022-03-20 18:39:15,311 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:15,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [580257072] [2022-03-20 18:39:15,460 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:15,460 INFO L85 PathProgramCache]: Analyzing trace with hash -889438095, now seen corresponding path program 1 times [2022-03-20 18:39:15,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:15,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633201784] [2022-03-20 18:39:15,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:15,461 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:15,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:15,466 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:15,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:15,484 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:15,484 INFO L85 PathProgramCache]: Analyzing trace with hash 421425608, now seen corresponding path program 14 times [2022-03-20 18:39:15,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:15,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320651602] [2022-03-20 18:39:15,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:15,484 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:15,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:15,566 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:15,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:15,570 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:15,570 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:15,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320651602] [2022-03-20 18:39:15,570 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1320651602] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:15,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [322802734] [2022-03-20 18:39:15,570 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:39:15,570 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:15,570 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:15,571 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:15,572 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-20 18:39:15,597 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:39:15,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:15,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-20 18:39:15,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:15,682 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 18:39:15,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:16,000 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 18:39:16,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [322802734] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:16,001 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:16,001 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 14] total 25 [2022-03-20 18:39:16,001 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:16,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [580257072] [2022-03-20 18:39:16,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [580257072] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:16,001 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:16,001 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 18:39:16,001 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051456454] [2022-03-20 18:39:16,001 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:16,002 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 18:39:16,002 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:16,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 18:39:16,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=454, Unknown=0, NotChecked=0, Total=600 [2022-03-20 18:39:16,002 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 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 18:39:16,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:16,139 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2022-03-20 18:39:16,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 18:39:16,139 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 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 27 [2022-03-20 18:39:16,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:16,140 INFO L225 Difference]: With dead ends: 38 [2022-03-20 18:39:16,140 INFO L226 Difference]: Without dead ends: 31 [2022-03-20 18:39:16,140 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=792, Unknown=0, NotChecked=0, Total=1056 [2022-03-20 18:39:16,141 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 16 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:16,141 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 24 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:39:16,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-03-20 18:39:16,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-03-20 18:39:16,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 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 18:39:16,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2022-03-20 18:39:16,145 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 27 [2022-03-20 18:39:16,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:16,145 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2022-03-20 18:39:16,145 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 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 18:39:16,145 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2022-03-20 18:39:16,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 18:39:16,146 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:16,146 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:16,162 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 18:39:16,359 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,SelfDestructingSolverStorable16,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:16,359 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:16,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:16,360 INFO L85 PathProgramCache]: Analyzing trace with hash -1089946779, now seen corresponding path program 15 times [2022-03-20 18:39:16,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:16,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [318506567] [2022-03-20 18:39:16,494 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:16,494 INFO L85 PathProgramCache]: Analyzing trace with hash -830332751, now seen corresponding path program 1 times [2022-03-20 18:39:16,494 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:16,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310662555] [2022-03-20 18:39:16,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:16,495 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:16,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:16,499 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:16,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:16,520 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:16,520 INFO L85 PathProgramCache]: Analyzing trace with hash -1089946779, now seen corresponding path program 16 times [2022-03-20 18:39:16,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:16,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583961960] [2022-03-20 18:39:16,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:16,520 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:16,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:16,612 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:16,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:16,615 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:16,615 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:16,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583961960] [2022-03-20 18:39:16,615 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1583961960] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:16,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [337772148] [2022-03-20 18:39:16,615 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:39:16,615 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:16,616 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:16,616 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:16,617 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-20 18:39:16,642 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:39:16,642 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:16,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-20 18:39:16,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:16,743 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 18:39:16,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:16,967 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 18:39:16,967 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [337772148] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:16,968 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:16,968 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-03-20 18:39:16,968 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:16,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [318506567] [2022-03-20 18:39:16,968 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [318506567] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:16,968 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:16,968 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 18:39:16,968 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90614771] [2022-03-20 18:39:16,968 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:16,968 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 18:39:16,968 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:16,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 18:39:16,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=388, Unknown=0, NotChecked=0, Total=552 [2022-03-20 18:39:16,969 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 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 18:39:17,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:17,137 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2022-03-20 18:39:17,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 18:39:17,138 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 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 29 [2022-03-20 18:39:17,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:17,138 INFO L225 Difference]: With dead ends: 40 [2022-03-20 18:39:17,138 INFO L226 Difference]: Without dead ends: 33 [2022-03-20 18:39:17,139 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=306, Invalid=750, Unknown=0, NotChecked=0, Total=1056 [2022-03-20 18:39:17,139 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 17 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:17,139 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 24 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:39:17,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-20 18:39:17,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-03-20 18:39:17,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 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 18:39:17,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2022-03-20 18:39:17,145 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 29 [2022-03-20 18:39:17,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:17,145 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2022-03-20 18:39:17,145 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 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 18:39:17,145 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2022-03-20 18:39:17,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-20 18:39:17,146 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:17,146 INFO L499 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:17,170 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-20 18:39:17,359 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-20 18:39:17,360 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:17,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:17,360 INFO L85 PathProgramCache]: Analyzing trace with hash -1819864638, now seen corresponding path program 17 times [2022-03-20 18:39:17,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:17,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2012675102] [2022-03-20 18:39:17,505 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:17,505 INFO L85 PathProgramCache]: Analyzing trace with hash -771227407, now seen corresponding path program 1 times [2022-03-20 18:39:17,505 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:17,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [247702007] [2022-03-20 18:39:17,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:17,505 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:17,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:17,510 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:17,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:17,514 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:17,514 INFO L85 PathProgramCache]: Analyzing trace with hash -1819864638, now seen corresponding path program 18 times [2022-03-20 18:39:17,514 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:17,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [859863249] [2022-03-20 18:39:17,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:17,514 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:17,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:17,665 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:17,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:17,669 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:17,669 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:17,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [859863249] [2022-03-20 18:39:17,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [859863249] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:17,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2122472781] [2022-03-20 18:39:17,669 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:39:17,669 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:17,669 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:17,670 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:17,671 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-20 18:39:17,715 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:39:17,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:17,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:39:17,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:17,801 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 1 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2022-03-20 18:39:17,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:17,992 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 1 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2022-03-20 18:39:17,992 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2122472781] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:17,992 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:17,992 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 4, 8] total 21 [2022-03-20 18:39:17,992 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:17,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2012675102] [2022-03-20 18:39:17,992 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2012675102] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:17,992 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:17,992 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 18:39:17,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765033880] [2022-03-20 18:39:17,992 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:17,993 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 18:39:17,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:17,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 18:39:17,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=325, Unknown=0, NotChecked=0, Total=420 [2022-03-20 18:39:17,993 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 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 18:39:18,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:18,174 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2022-03-20 18:39:18,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 18:39:18,175 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 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 31 [2022-03-20 18:39:18,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:18,175 INFO L225 Difference]: With dead ends: 42 [2022-03-20 18:39:18,175 INFO L226 Difference]: Without dead ends: 35 [2022-03-20 18:39:18,176 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=191, Invalid=739, Unknown=0, NotChecked=0, Total=930 [2022-03-20 18:39:18,176 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 18 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:18,176 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 19 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:39:18,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-20 18:39:18,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-03-20 18:39:18,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.1) internal successors, (33), 30 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 18:39:18,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-03-20 18:39:18,181 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 31 [2022-03-20 18:39:18,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:18,181 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-03-20 18:39:18,181 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 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 18:39:18,181 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-03-20 18:39:18,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-20 18:39:18,181 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:18,182 INFO L499 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:18,187 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 18:39:18,387 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,SelfDestructingSolverStorable20,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:18,387 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:18,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:18,387 INFO L85 PathProgramCache]: Analyzing trace with hash 1103709407, now seen corresponding path program 19 times [2022-03-20 18:39:18,388 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:18,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1935016259] [2022-03-20 18:39:18,499 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:18,500 INFO L85 PathProgramCache]: Analyzing trace with hash -712122063, now seen corresponding path program 1 times [2022-03-20 18:39:18,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:18,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1321220138] [2022-03-20 18:39:18,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:18,500 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:18,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:18,504 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:18,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:18,509 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:18,509 INFO L85 PathProgramCache]: Analyzing trace with hash 1103709407, now seen corresponding path program 20 times [2022-03-20 18:39:18,509 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:18,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1387861190] [2022-03-20 18:39:18,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:18,509 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:18,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:18,636 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:18,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:18,639 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:18,639 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:18,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1387861190] [2022-03-20 18:39:18,639 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1387861190] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:18,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [509811865] [2022-03-20 18:39:18,639 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:39:18,640 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:18,640 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:18,649 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:18,650 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-20 18:39:18,676 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:39:18,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:18,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-20 18:39:18,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:18,792 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:18,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:19,200 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:19,201 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [509811865] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:19,201 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:19,201 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 14] total 27 [2022-03-20 18:39:19,201 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:19,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1935016259] [2022-03-20 18:39:19,201 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1935016259] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:19,201 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:19,201 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 18:39:19,201 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426585942] [2022-03-20 18:39:19,201 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:19,201 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 18:39:19,201 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:19,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 18:39:19,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=495, Unknown=0, NotChecked=0, Total=702 [2022-03-20 18:39:19,202 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 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 18:39:19,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:19,388 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2022-03-20 18:39:19,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 18:39:19,388 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 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 33 [2022-03-20 18:39:19,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:19,388 INFO L225 Difference]: With dead ends: 44 [2022-03-20 18:39:19,388 INFO L226 Difference]: Without dead ends: 37 [2022-03-20 18:39:19,389 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=403, Invalid=1003, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 18:39:19,389 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 19 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:19,389 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 29 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:39:19,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-03-20 18:39:19,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-03-20 18:39:19,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.09375) internal successors, (35), 32 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 18:39:19,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2022-03-20 18:39:19,394 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 33 [2022-03-20 18:39:19,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:19,394 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2022-03-20 18:39:19,394 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 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 18:39:19,394 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2022-03-20 18:39:19,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-20 18:39:19,395 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:19,395 INFO L499 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:19,410 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-20 18:39:19,602 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,SelfDestructingSolverStorable21,SelfDestructingSolverStorable22 [2022-03-20 18:39:19,602 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:19,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:19,602 INFO L85 PathProgramCache]: Analyzing trace with hash 1749755068, now seen corresponding path program 21 times [2022-03-20 18:39:19,603 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:19,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [119270910] [2022-03-20 18:39:19,760 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:19,761 INFO L85 PathProgramCache]: Analyzing trace with hash -653016719, now seen corresponding path program 1 times [2022-03-20 18:39:19,761 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:19,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [139626343] [2022-03-20 18:39:19,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:19,761 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:19,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:19,765 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:19,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:19,769 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:19,769 INFO L85 PathProgramCache]: Analyzing trace with hash 1749755068, now seen corresponding path program 22 times [2022-03-20 18:39:19,769 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:19,769 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1211220852] [2022-03-20 18:39:19,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:19,770 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:19,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:19,896 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:19,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:19,904 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 12 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:19,904 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:19,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1211220852] [2022-03-20 18:39:19,904 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1211220852] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:19,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [213996653] [2022-03-20 18:39:19,904 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:39:19,904 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:19,904 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:19,905 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:19,906 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-20 18:39:19,931 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:39:19,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:19,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-20 18:39:19,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:20,048 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 18:39:20,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:20,421 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 18:39:20,421 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [213996653] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:20,421 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:20,421 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 30 [2022-03-20 18:39:20,421 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:20,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [119270910] [2022-03-20 18:39:20,421 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [119270910] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:20,421 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:20,421 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 18:39:20,421 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001220000] [2022-03-20 18:39:20,421 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:20,422 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 18:39:20,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:20,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 18:39:20,422 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=619, Unknown=0, NotChecked=0, Total=870 [2022-03-20 18:39:20,422 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 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 18:39:20,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:20,681 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2022-03-20 18:39:20,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 18:39:20,682 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 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 35 [2022-03-20 18:39:20,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:20,682 INFO L225 Difference]: With dead ends: 46 [2022-03-20 18:39:20,682 INFO L226 Difference]: Without dead ends: 39 [2022-03-20 18:39:20,683 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=477, Invalid=1245, Unknown=0, NotChecked=0, Total=1722 [2022-03-20 18:39:20,683 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 20 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:20,684 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 64 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:39:20,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-03-20 18:39:20,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2022-03-20 18:39:20,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 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 18:39:20,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2022-03-20 18:39:20,688 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 35 [2022-03-20 18:39:20,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:20,689 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2022-03-20 18:39:20,689 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 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 18:39:20,689 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2022-03-20 18:39:20,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-20 18:39:20,689 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:20,689 INFO L499 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:20,712 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-20 18:39:20,903 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,SelfDestructingSolverStorable23,SelfDestructingSolverStorable24 [2022-03-20 18:39:20,903 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:20,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:20,904 INFO L85 PathProgramCache]: Analyzing trace with hash -170622631, now seen corresponding path program 23 times [2022-03-20 18:39:20,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:20,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1621929476] [2022-03-20 18:39:21,073 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:21,073 INFO L85 PathProgramCache]: Analyzing trace with hash -593911375, now seen corresponding path program 1 times [2022-03-20 18:39:21,073 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:21,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191831515] [2022-03-20 18:39:21,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:21,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:21,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:21,081 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:21,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:21,088 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:21,088 INFO L85 PathProgramCache]: Analyzing trace with hash -170622631, now seen corresponding path program 24 times [2022-03-20 18:39:21,088 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:21,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846367157] [2022-03-20 18:39:21,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:21,088 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:21,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:21,236 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:21,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:21,240 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 13 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:21,240 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:21,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1846367157] [2022-03-20 18:39:21,240 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1846367157] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:21,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [357579127] [2022-03-20 18:39:21,240 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:39:21,240 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:21,240 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:21,241 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:21,242 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-20 18:39:21,286 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:39:21,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:21,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:39:21,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:21,381 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 36 proven. 1 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2022-03-20 18:39:21,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:21,590 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 36 proven. 1 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2022-03-20 18:39:21,590 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [357579127] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:21,590 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:21,590 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 4, 8] total 24 [2022-03-20 18:39:21,590 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:21,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1621929476] [2022-03-20 18:39:21,590 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1621929476] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:21,590 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:21,591 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 18:39:21,591 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638340288] [2022-03-20 18:39:21,591 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:21,591 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 18:39:21,591 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:21,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 18:39:21,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2022-03-20 18:39:21,592 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand has 16 states, 16 states have (on average 2.0625) internal successors, (33), 15 states have internal predecessors, (33), 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 18:39:21,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:21,875 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2022-03-20 18:39:21,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 18:39:21,876 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 15 states have internal predecessors, (33), 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 37 [2022-03-20 18:39:21,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:21,876 INFO L225 Difference]: With dead ends: 48 [2022-03-20 18:39:21,876 INFO L226 Difference]: Without dead ends: 41 [2022-03-20 18:39:21,877 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=242, Invalid=1090, Unknown=0, NotChecked=0, Total=1332 [2022-03-20 18:39:21,877 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 21 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 357 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 384 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:21,877 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 59 Invalid, 384 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 357 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 18:39:21,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-20 18:39:21,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-03-20 18:39:21,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 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 18:39:21,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2022-03-20 18:39:21,882 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 37 [2022-03-20 18:39:21,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:21,882 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2022-03-20 18:39:21,882 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 15 states have internal predecessors, (33), 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 18:39:21,882 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2022-03-20 18:39:21,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 18:39:21,883 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:21,883 INFO L499 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:21,893 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 18:39:22,086 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,SelfDestructingSolverStorable25,SelfDestructingSolverStorable26 [2022-03-20 18:39:22,087 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:22,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:22,087 INFO L85 PathProgramCache]: Analyzing trace with hash 1182345910, now seen corresponding path program 25 times [2022-03-20 18:39:22,087 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:22,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [841749227] [2022-03-20 18:39:22,226 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:22,226 INFO L85 PathProgramCache]: Analyzing trace with hash -534806031, now seen corresponding path program 1 times [2022-03-20 18:39:22,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:22,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908937082] [2022-03-20 18:39:22,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:22,228 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:22,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:22,238 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:22,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:22,242 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:22,242 INFO L85 PathProgramCache]: Analyzing trace with hash 1182345910, now seen corresponding path program 26 times [2022-03-20 18:39:22,242 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:22,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267239326] [2022-03-20 18:39:22,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:22,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:22,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:22,392 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:22,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:22,403 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 14 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:22,404 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:22,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267239326] [2022-03-20 18:39:22,404 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1267239326] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:22,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554482416] [2022-03-20 18:39:22,404 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:39:22,404 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:22,404 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:22,405 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:22,405 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-20 18:39:22,435 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:39:22,436 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:22,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-20 18:39:22,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:22,571 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 18:39:22,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:23,253 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 18:39:23,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1554482416] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:23,253 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:23,253 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 20] total 37 [2022-03-20 18:39:23,254 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:23,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [841749227] [2022-03-20 18:39:23,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [841749227] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:23,254 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:23,254 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 18:39:23,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297058611] [2022-03-20 18:39:23,254 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:23,254 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 18:39:23,254 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:23,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 18:39:23,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=1006, Unknown=0, NotChecked=0, Total=1332 [2022-03-20 18:39:23,255 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 16 states have internal predecessors, (35), 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 18:39:23,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:23,576 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2022-03-20 18:39:23,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-20 18:39:23,576 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 16 states have internal predecessors, (35), 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 39 [2022-03-20 18:39:23,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:23,577 INFO L225 Difference]: With dead ends: 50 [2022-03-20 18:39:23,577 INFO L226 Difference]: Without dead ends: 43 [2022-03-20 18:39:23,577 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=618, Invalid=1932, Unknown=0, NotChecked=0, Total=2550 [2022-03-20 18:39:23,578 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 22 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 402 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:23,578 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 54 Invalid, 431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 402 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:39:23,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-03-20 18:39:23,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-03-20 18:39:23,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 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 18:39:23,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2022-03-20 18:39:23,583 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 39 [2022-03-20 18:39:23,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:23,583 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2022-03-20 18:39:23,583 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 16 states have internal predecessors, (35), 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 18:39:23,583 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2022-03-20 18:39:23,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-20 18:39:23,583 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:23,583 INFO L499 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:23,601 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-20 18:39:23,790 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,SelfDestructingSolverStorable27,SelfDestructingSolverStorable28 [2022-03-20 18:39:23,790 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:23,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:23,790 INFO L85 PathProgramCache]: Analyzing trace with hash 10023123, now seen corresponding path program 27 times [2022-03-20 18:39:23,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:23,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [4289630] [2022-03-20 18:39:23,913 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:23,914 INFO L85 PathProgramCache]: Analyzing trace with hash -475700687, now seen corresponding path program 1 times [2022-03-20 18:39:23,914 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:23,914 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [229982964] [2022-03-20 18:39:23,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:23,914 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:23,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:23,918 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:23,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:23,922 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:23,922 INFO L85 PathProgramCache]: Analyzing trace with hash 10023123, now seen corresponding path program 28 times [2022-03-20 18:39:23,922 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:23,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [343167068] [2022-03-20 18:39:23,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:23,922 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:23,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:24,100 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:24,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:24,102 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 15 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:24,103 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:24,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [343167068] [2022-03-20 18:39:24,103 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [343167068] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:24,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [101710889] [2022-03-20 18:39:24,103 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:39:24,103 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:24,103 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:24,104 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:24,104 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-20 18:39:24,135 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:39:24,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:24,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-20 18:39:24,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:24,260 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 18:39:24,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:24,783 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 18:39:24,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [101710889] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:24,784 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:24,784 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 36 [2022-03-20 18:39:24,784 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:24,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [4289630] [2022-03-20 18:39:24,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [4289630] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:24,784 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:24,784 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-20 18:39:24,784 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313987385] [2022-03-20 18:39:24,784 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:24,784 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-20 18:39:24,784 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:24,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-20 18:39:24,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=904, Unknown=0, NotChecked=0, Total=1260 [2022-03-20 18:39:24,785 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 17 states have internal predecessors, (37), 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 18:39:25,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:25,130 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2022-03-20 18:39:25,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 18:39:25,130 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 17 states have internal predecessors, (37), 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 41 [2022-03-20 18:39:25,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:25,131 INFO L225 Difference]: With dead ends: 52 [2022-03-20 18:39:25,131 INFO L226 Difference]: Without dead ends: 45 [2022-03-20 18:39:25,131 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=684, Invalid=1866, Unknown=0, NotChecked=0, Total=2550 [2022-03-20 18:39:25,132 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 23 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 475 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 475 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:25,132 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 69 Invalid, 506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 475 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:39:25,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-20 18:39:25,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-03-20 18:39:25,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.075) internal successors, (43), 40 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 18:39:25,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2022-03-20 18:39:25,138 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 41 [2022-03-20 18:39:25,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:25,138 INFO L478 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2022-03-20 18:39:25,138 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 17 states have internal predecessors, (37), 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 18:39:25,138 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2022-03-20 18:39:25,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-20 18:39:25,139 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:25,139 INFO L499 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:25,155 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 18:39:25,355 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,SelfDestructingSolverStorable30,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:25,355 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:25,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:25,355 INFO L85 PathProgramCache]: Analyzing trace with hash -1310743632, now seen corresponding path program 29 times [2022-03-20 18:39:25,356 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:25,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [593793591] [2022-03-20 18:39:25,463 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:25,463 INFO L85 PathProgramCache]: Analyzing trace with hash -416595343, now seen corresponding path program 1 times [2022-03-20 18:39:25,463 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:25,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1067621618] [2022-03-20 18:39:25,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:25,463 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:25,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:25,467 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:25,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:25,470 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:25,470 INFO L85 PathProgramCache]: Analyzing trace with hash -1310743632, now seen corresponding path program 30 times [2022-03-20 18:39:25,470 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:25,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144877647] [2022-03-20 18:39:25,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:25,471 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:25,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:25,685 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:25,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:25,689 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 16 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:25,689 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:25,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144877647] [2022-03-20 18:39:25,689 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [144877647] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:25,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1942955102] [2022-03-20 18:39:25,689 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:39:25,689 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:25,690 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:25,690 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:25,691 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-20 18:39:25,718 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:39:25,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:25,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 18:39:25,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:25,812 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 45 proven. 1 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-03-20 18:39:25,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:25,976 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 45 proven. 1 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-03-20 18:39:25,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1942955102] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:25,976 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:25,976 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 4, 7] total 26 [2022-03-20 18:39:25,976 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:25,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [593793591] [2022-03-20 18:39:25,977 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [593793591] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:25,977 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:25,977 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 18:39:25,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107503570] [2022-03-20 18:39:25,977 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:25,977 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 18:39:25,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:25,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 18:39:25,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=523, Unknown=0, NotChecked=0, Total=650 [2022-03-20 18:39:25,978 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 19 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 18 states have internal predecessors, (39), 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 18:39:26,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:26,375 INFO L93 Difference]: Finished difference Result 54 states and 58 transitions. [2022-03-20 18:39:26,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 18:39:26,375 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 18 states have internal predecessors, (39), 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 43 [2022-03-20 18:39:26,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:26,375 INFO L225 Difference]: With dead ends: 54 [2022-03-20 18:39:26,375 INFO L226 Difference]: Without dead ends: 47 [2022-03-20 18:39:26,376 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=279, Invalid=1443, Unknown=0, NotChecked=0, Total=1722 [2022-03-20 18:39:26,376 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 24 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 552 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 585 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 552 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:26,376 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 84 Invalid, 585 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 552 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:39:26,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-03-20 18:39:26,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-03-20 18:39:26,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 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 18:39:26,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2022-03-20 18:39:26,382 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 43 [2022-03-20 18:39:26,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:26,382 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2022-03-20 18:39:26,382 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 18 states have internal predecessors, (39), 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 18:39:26,382 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2022-03-20 18:39:26,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-20 18:39:26,382 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:26,382 INFO L499 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:26,401 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-20 18:39:26,583 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,SelfDestructingSolverStorable32,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:26,583 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:26,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:26,583 INFO L85 PathProgramCache]: Analyzing trace with hash 742724429, now seen corresponding path program 31 times [2022-03-20 18:39:26,583 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:26,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1867061458] [2022-03-20 18:39:26,700 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:26,701 INFO L85 PathProgramCache]: Analyzing trace with hash -357489999, now seen corresponding path program 1 times [2022-03-20 18:39:26,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:26,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1875358852] [2022-03-20 18:39:26,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:26,701 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:26,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:26,706 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:26,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:26,710 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:26,710 INFO L85 PathProgramCache]: Analyzing trace with hash 742724429, now seen corresponding path program 32 times [2022-03-20 18:39:26,710 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:26,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [896008052] [2022-03-20 18:39:26,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:26,710 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:26,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:26,929 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:26,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:26,938 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 17 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:26,938 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:26,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [896008052] [2022-03-20 18:39:26,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [896008052] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:26,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1779644971] [2022-03-20 18:39:26,938 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:39:26,938 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:26,938 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:26,939 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:26,950 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-20 18:39:26,984 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:39:26,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:26,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-20 18:39:26,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:27,124 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 17 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:27,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:28,051 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 17 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:28,051 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1779644971] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:28,051 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:28,051 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 20] total 39 [2022-03-20 18:39:28,051 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:28,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1867061458] [2022-03-20 18:39:28,051 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1867061458] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:28,051 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:28,052 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 18:39:28,052 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657232600] [2022-03-20 18:39:28,052 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:28,052 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 18:39:28,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:28,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 18:39:28,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=417, Invalid=1065, Unknown=0, NotChecked=0, Total=1482 [2022-03-20 18:39:28,053 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 20 states, 20 states have (on average 2.05) internal successors, (41), 19 states have internal predecessors, (41), 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 18:39:28,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:28,409 INFO L93 Difference]: Finished difference Result 56 states and 60 transitions. [2022-03-20 18:39:28,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-20 18:39:28,410 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.05) internal successors, (41), 19 states have internal predecessors, (41), 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 45 [2022-03-20 18:39:28,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:28,412 INFO L225 Difference]: With dead ends: 56 [2022-03-20 18:39:28,412 INFO L226 Difference]: Without dead ends: 49 [2022-03-20 18:39:28,413 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=823, Invalid=2257, Unknown=0, NotChecked=0, Total=3080 [2022-03-20 18:39:28,413 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 25 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 573 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 573 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:28,420 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 49 Invalid, 608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 573 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:39:28,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-03-20 18:39:28,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-03-20 18:39:28,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 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 18:39:28,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2022-03-20 18:39:28,425 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 45 [2022-03-20 18:39:28,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:28,425 INFO L478 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2022-03-20 18:39:28,425 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.05) internal successors, (41), 19 states have internal predecessors, (41), 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 18:39:28,425 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2022-03-20 18:39:28,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-20 18:39:28,425 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:28,425 INFO L499 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:28,441 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-20 18:39:28,626 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,SelfDestructingSolverStorable33,SelfDestructingSolverStorable34 [2022-03-20 18:39:28,627 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:28,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:28,627 INFO L85 PathProgramCache]: Analyzing trace with hash -1559425110, now seen corresponding path program 33 times [2022-03-20 18:39:28,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:28,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [182793562] [2022-03-20 18:39:28,732 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:28,733 INFO L85 PathProgramCache]: Analyzing trace with hash -298384655, now seen corresponding path program 1 times [2022-03-20 18:39:28,733 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:28,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1606618212] [2022-03-20 18:39:28,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:28,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:28,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:28,738 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:28,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:28,742 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:28,742 INFO L85 PathProgramCache]: Analyzing trace with hash -1559425110, now seen corresponding path program 34 times [2022-03-20 18:39:28,742 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:28,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [401556602] [2022-03-20 18:39:28,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:28,742 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:28,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:28,962 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:28,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:28,980 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 18 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:28,980 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:28,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [401556602] [2022-03-20 18:39:28,980 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [401556602] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:28,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2084562597] [2022-03-20 18:39:28,980 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:39:28,980 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:28,981 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:28,981 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:28,983 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-20 18:39:29,030 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:39:29,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:29,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 38 conjunts are in the unsatisfiable core [2022-03-20 18:39:29,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:29,159 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 18 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:29,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:30,220 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 18 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:30,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2084562597] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:30,221 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:30,221 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 21] total 41 [2022-03-20 18:39:30,221 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:30,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [182793562] [2022-03-20 18:39:30,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [182793562] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:30,221 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:30,221 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-20 18:39:30,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183035829] [2022-03-20 18:39:30,221 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:30,221 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-20 18:39:30,222 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:30,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-20 18:39:30,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=459, Invalid=1181, Unknown=0, NotChecked=0, Total=1640 [2022-03-20 18:39:30,222 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 21 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 20 states have internal predecessors, (43), 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 18:39:30,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:30,624 INFO L93 Difference]: Finished difference Result 58 states and 62 transitions. [2022-03-20 18:39:30,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-20 18:39:30,624 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 20 states have internal predecessors, (43), 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 47 [2022-03-20 18:39:30,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:30,625 INFO L225 Difference]: With dead ends: 58 [2022-03-20 18:39:30,625 INFO L226 Difference]: Without dead ends: 51 [2022-03-20 18:39:30,626 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=907, Invalid=2515, Unknown=0, NotChecked=0, Total=3422 [2022-03-20 18:39:30,626 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 26 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 604 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 641 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:30,626 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 19 Invalid, 641 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 604 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 18:39:30,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-03-20 18:39:30,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-03-20 18:39:30,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 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 18:39:30,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2022-03-20 18:39:30,632 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 47 [2022-03-20 18:39:30,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:30,632 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2022-03-20 18:39:30,632 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 20 states have internal predecessors, (43), 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 18:39:30,632 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2022-03-20 18:39:30,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-20 18:39:30,632 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:30,632 INFO L499 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:30,650 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 18:39:30,833 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-03-20 18:39:30,833 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:30,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:30,833 INFO L85 PathProgramCache]: Analyzing trace with hash -2016974649, now seen corresponding path program 35 times [2022-03-20 18:39:30,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:30,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [630744002] [2022-03-20 18:39:30,974 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:30,975 INFO L85 PathProgramCache]: Analyzing trace with hash -239279311, now seen corresponding path program 1 times [2022-03-20 18:39:30,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:30,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836614512] [2022-03-20 18:39:30,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:30,975 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:30,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:30,979 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:30,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:30,985 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:30,985 INFO L85 PathProgramCache]: Analyzing trace with hash -2016974649, now seen corresponding path program 36 times [2022-03-20 18:39:30,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:30,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073052612] [2022-03-20 18:39:30,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:30,985 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:30,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:31,259 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:31,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:31,262 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 19 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:31,262 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:31,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073052612] [2022-03-20 18:39:31,262 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2073052612] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:31,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [7894513] [2022-03-20 18:39:31,262 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:39:31,262 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:31,262 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:31,263 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 18:39:31,264 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-20 18:39:31,308 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:39:31,308 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:31,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 18:39:31,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:31,418 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 54 proven. 1 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2022-03-20 18:39:31,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:31,606 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 54 proven. 1 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2022-03-20 18:39:31,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [7894513] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:31,606 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:31,607 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 4, 7] total 29 [2022-03-20 18:39:31,607 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:31,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [630744002] [2022-03-20 18:39:31,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [630744002] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:31,607 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:31,607 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-20 18:39:31,607 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293815684] [2022-03-20 18:39:31,607 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:31,607 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-20 18:39:31,607 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:31,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-20 18:39:31,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=664, Unknown=0, NotChecked=0, Total=812 [2022-03-20 18:39:31,608 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 22 states, 22 states have (on average 2.0454545454545454) internal successors, (45), 21 states have internal predecessors, (45), 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 18:39:32,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:32,133 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2022-03-20 18:39:32,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-20 18:39:32,134 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0454545454545454) internal successors, (45), 21 states have internal predecessors, (45), 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 49 [2022-03-20 18:39:32,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:32,134 INFO L225 Difference]: With dead ends: 60 [2022-03-20 18:39:32,134 INFO L226 Difference]: Without dead ends: 53 [2022-03-20 18:39:32,135 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=330, Invalid=1926, Unknown=0, NotChecked=0, Total=2256 [2022-03-20 18:39:32,135 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 27 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 759 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 759 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:32,135 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 89 Invalid, 798 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 759 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:39:32,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-03-20 18:39:32,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-03-20 18:39:32,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0625) internal successors, (51), 48 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 18:39:32,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2022-03-20 18:39:32,141 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 49 [2022-03-20 18:39:32,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:32,141 INFO L478 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2022-03-20 18:39:32,141 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.0454545454545454) internal successors, (45), 21 states have internal predecessors, (45), 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 18:39:32,141 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2022-03-20 18:39:32,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-03-20 18:39:32,141 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:32,142 INFO L499 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:32,148 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-20 18:39:32,345 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37,SelfDestructingSolverStorable38 [2022-03-20 18:39:32,346 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:32,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:32,346 INFO L85 PathProgramCache]: Analyzing trace with hash 659549860, now seen corresponding path program 37 times [2022-03-20 18:39:32,346 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:32,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [752865178] [2022-03-20 18:39:32,469 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:32,469 INFO L85 PathProgramCache]: Analyzing trace with hash -180173967, now seen corresponding path program 1 times [2022-03-20 18:39:32,469 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:32,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583942243] [2022-03-20 18:39:32,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:32,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:32,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:32,473 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:32,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:32,481 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:32,481 INFO L85 PathProgramCache]: Analyzing trace with hash 659549860, now seen corresponding path program 38 times [2022-03-20 18:39:32,481 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:32,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [900410628] [2022-03-20 18:39:32,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:32,481 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:32,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:32,760 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:32,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:32,774 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:32,774 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:32,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [900410628] [2022-03-20 18:39:32,774 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [900410628] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:32,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1823036563] [2022-03-20 18:39:32,775 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:39:32,775 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:32,775 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:32,776 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 18:39:32,790 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 18:39:32,825 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:39:32,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:32,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-20 18:39:32,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:32,979 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:32,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:34,344 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:34,344 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1823036563] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:34,344 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:34,344 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 23] total 45 [2022-03-20 18:39:34,345 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:34,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [752865178] [2022-03-20 18:39:34,345 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [752865178] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:34,345 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:34,345 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-20 18:39:34,345 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65549034] [2022-03-20 18:39:34,345 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:34,345 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-20 18:39:34,345 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:34,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-20 18:39:34,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=549, Invalid=1431, Unknown=0, NotChecked=0, Total=1980 [2022-03-20 18:39:34,346 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 22 states have internal predecessors, (47), 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 18:39:34,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:34,959 INFO L93 Difference]: Finished difference Result 62 states and 66 transitions. [2022-03-20 18:39:34,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 18:39:34,961 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 22 states have internal predecessors, (47), 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 51 [2022-03-20 18:39:34,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:34,962 INFO L225 Difference]: With dead ends: 62 [2022-03-20 18:39:34,962 INFO L226 Difference]: Without dead ends: 55 [2022-03-20 18:39:34,963 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1087, Invalid=3073, Unknown=0, NotChecked=0, Total=4160 [2022-03-20 18:39:34,964 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 28 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 786 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 827 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 786 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:34,964 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 49 Invalid, 827 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 786 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:39:34,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-20 18:39:34,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-03-20 18:39:34,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.06) internal successors, (53), 50 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 18:39:34,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2022-03-20 18:39:34,973 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 51 [2022-03-20 18:39:34,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:34,973 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2022-03-20 18:39:34,973 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 22 states have internal predecessors, (47), 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 18:39:34,973 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2022-03-20 18:39:34,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-03-20 18:39:34,974 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:34,974 INFO L499 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:34,998 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 18:39:35,180 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-03-20 18:39:35,180 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:35,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:35,180 INFO L85 PathProgramCache]: Analyzing trace with hash 114192705, now seen corresponding path program 39 times [2022-03-20 18:39:35,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:35,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [883684037] [2022-03-20 18:39:35,291 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:35,291 INFO L85 PathProgramCache]: Analyzing trace with hash -121068623, now seen corresponding path program 1 times [2022-03-20 18:39:35,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:35,291 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186203018] [2022-03-20 18:39:35,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:35,292 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:35,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:35,298 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:35,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:35,303 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:35,303 INFO L85 PathProgramCache]: Analyzing trace with hash 114192705, now seen corresponding path program 40 times [2022-03-20 18:39:35,303 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:35,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031932097] [2022-03-20 18:39:35,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:35,303 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:35,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:35,586 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:35,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:35,588 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 21 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:35,588 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:35,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031932097] [2022-03-20 18:39:35,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1031932097] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:35,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [510521931] [2022-03-20 18:39:35,589 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:39:35,589 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:35,589 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:35,590 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 18:39:35,600 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 18:39:35,643 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:39:35,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:35,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 45 conjunts are in the unsatisfiable core [2022-03-20 18:39:35,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:35,818 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 18:39:35,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:37,177 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 18:39:37,177 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [510521931] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:37,177 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:37,177 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2022-03-20 18:39:37,178 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:37,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [883684037] [2022-03-20 18:39:37,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [883684037] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:37,178 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:37,178 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-20 18:39:37,178 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406233951] [2022-03-20 18:39:37,178 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:37,178 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-20 18:39:37,178 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:37,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-20 18:39:37,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=620, Invalid=1636, Unknown=0, NotChecked=0, Total=2256 [2022-03-20 18:39:37,180 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 23 states have internal predecessors, (49), 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 18:39:37,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:37,762 INFO L93 Difference]: Finished difference Result 64 states and 68 transitions. [2022-03-20 18:39:37,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-20 18:39:37,763 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 23 states have internal predecessors, (49), 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 53 [2022-03-20 18:39:37,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:37,763 INFO L225 Difference]: With dead ends: 64 [2022-03-20 18:39:37,763 INFO L226 Difference]: Without dead ends: 57 [2022-03-20 18:39:37,765 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 83 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1206, Invalid=3486, Unknown=0, NotChecked=0, Total=4692 [2022-03-20 18:39:37,765 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 29 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 925 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 968 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 925 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:37,765 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 99 Invalid, 968 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 925 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:39:37,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-03-20 18:39:37,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-03-20 18:39:37,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 52 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 18:39:37,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2022-03-20 18:39:37,779 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 53 [2022-03-20 18:39:37,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:37,779 INFO L478 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2022-03-20 18:39:37,779 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 23 states have internal predecessors, (49), 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 18:39:37,779 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2022-03-20 18:39:37,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-03-20 18:39:37,779 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:37,779 INFO L499 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:37,796 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-20 18:39:37,995 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,SelfDestructingSolverStorable41,SelfDestructingSolverStorable42 [2022-03-20 18:39:37,995 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:37,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:37,996 INFO L85 PathProgramCache]: Analyzing trace with hash 11976862, now seen corresponding path program 41 times [2022-03-20 18:39:37,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:37,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1225044446] [2022-03-20 18:39:38,105 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:38,105 INFO L85 PathProgramCache]: Analyzing trace with hash -61963279, now seen corresponding path program 1 times [2022-03-20 18:39:38,105 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:38,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [371092407] [2022-03-20 18:39:38,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:38,105 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:38,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:38,109 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:38,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:38,112 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:38,113 INFO L85 PathProgramCache]: Analyzing trace with hash 11976862, now seen corresponding path program 42 times [2022-03-20 18:39:38,113 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:38,113 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680833975] [2022-03-20 18:39:38,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:38,113 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:38,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:38,426 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:38,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:38,433 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 22 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:38,434 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:38,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1680833975] [2022-03-20 18:39:38,434 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1680833975] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:38,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2136260190] [2022-03-20 18:39:38,434 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:39:38,434 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:38,434 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:38,435 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 18:39:38,435 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 18:39:38,485 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:39:38,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:38,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 18:39:38,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:38,620 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 63 proven. 1 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2022-03-20 18:39:38,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:38,848 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 63 proven. 1 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2022-03-20 18:39:38,848 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2136260190] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:38,848 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:38,848 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 4, 7] total 32 [2022-03-20 18:39:38,848 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:38,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1225044446] [2022-03-20 18:39:38,849 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1225044446] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:38,849 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:38,849 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-03-20 18:39:38,849 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890431300] [2022-03-20 18:39:38,849 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:38,849 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-03-20 18:39:38,849 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:38,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-03-20 18:39:38,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=823, Unknown=0, NotChecked=0, Total=992 [2022-03-20 18:39:38,850 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand has 25 states, 25 states have (on average 2.04) internal successors, (51), 24 states have internal predecessors, (51), 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 18:39:39,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:39,495 INFO L93 Difference]: Finished difference Result 66 states and 70 transitions. [2022-03-20 18:39:39,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-03-20 18:39:39,496 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.04) internal successors, (51), 24 states have internal predecessors, (51), 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 55 [2022-03-20 18:39:39,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:39,496 INFO L225 Difference]: With dead ends: 66 [2022-03-20 18:39:39,496 INFO L226 Difference]: Without dead ends: 59 [2022-03-20 18:39:39,497 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=381, Invalid=2481, Unknown=0, NotChecked=0, Total=2862 [2022-03-20 18:39:39,497 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 30 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 936 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 981 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 936 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:39,497 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 39 Invalid, 981 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 936 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 18:39:39,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-03-20 18:39:39,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-03-20 18:39:39,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 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 18:39:39,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2022-03-20 18:39:39,503 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 55 [2022-03-20 18:39:39,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:39,503 INFO L478 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2022-03-20 18:39:39,504 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.04) internal successors, (51), 24 states have internal predecessors, (51), 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 18:39:39,504 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2022-03-20 18:39:39,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-03-20 18:39:39,504 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:39,504 INFO L499 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:39,508 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 18:39:39,710 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,SelfDestructingSolverStorable43,SelfDestructingSolverStorable44 [2022-03-20 18:39:39,710 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:39,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:39,710 INFO L85 PathProgramCache]: Analyzing trace with hash 566799547, now seen corresponding path program 43 times [2022-03-20 18:39:39,710 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:39,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1230747583] [2022-03-20 18:39:39,817 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:39,817 INFO L85 PathProgramCache]: Analyzing trace with hash -2857935, now seen corresponding path program 1 times [2022-03-20 18:39:39,817 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:39,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1304945200] [2022-03-20 18:39:39,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:39,818 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:39,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:39,822 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:39,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:39,825 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:39,825 INFO L85 PathProgramCache]: Analyzing trace with hash 566799547, now seen corresponding path program 44 times [2022-03-20 18:39:39,826 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:39,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1995420399] [2022-03-20 18:39:39,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:39,826 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:39,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:40,146 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:40,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:40,149 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 23 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:40,149 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:40,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1995420399] [2022-03-20 18:39:40,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1995420399] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:40,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [155626002] [2022-03-20 18:39:40,150 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:39:40,150 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:40,150 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:40,151 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 18:39:40,163 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 18:39:40,208 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:39:40,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:40,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-20 18:39:40,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:40,371 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 23 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:40,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:42,359 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 23 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:42,359 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [155626002] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:42,359 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:42,359 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 26] total 51 [2022-03-20 18:39:42,359 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:42,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1230747583] [2022-03-20 18:39:42,359 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1230747583] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:42,359 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:42,359 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-20 18:39:42,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892207582] [2022-03-20 18:39:42,359 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:42,360 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-20 18:39:42,360 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:42,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-20 18:39:42,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=699, Invalid=1851, Unknown=0, NotChecked=0, Total=2550 [2022-03-20 18:39:42,361 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 25 states have internal predecessors, (53), 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 18:39:43,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:43,095 INFO L93 Difference]: Finished difference Result 68 states and 72 transitions. [2022-03-20 18:39:43,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-20 18:39:43,095 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 25 states have internal predecessors, (53), 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 57 [2022-03-20 18:39:43,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:43,096 INFO L225 Difference]: With dead ends: 68 [2022-03-20 18:39:43,096 INFO L226 Difference]: Without dead ends: 61 [2022-03-20 18:39:43,097 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1387, Invalid=4015, Unknown=0, NotChecked=0, Total=5402 [2022-03-20 18:39:43,097 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 31 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 1113 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 1160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 1113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:43,097 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 114 Invalid, 1160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 1113 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 18:39:43,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-03-20 18:39:43,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-03-20 18:39:43,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 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 18:39:43,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2022-03-20 18:39:43,104 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 57 [2022-03-20 18:39:43,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:43,104 INFO L478 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2022-03-20 18:39:43,104 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 25 states have internal predecessors, (53), 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 18:39:43,104 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2022-03-20 18:39:43,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-20 18:39:43,104 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:43,104 INFO L499 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:43,121 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-03-20 18:39:43,317 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,SelfDestructingSolverStorable46,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:43,318 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:43,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:43,318 INFO L85 PathProgramCache]: Analyzing trace with hash 1175455128, now seen corresponding path program 45 times [2022-03-20 18:39:43,318 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:43,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [80660894] [2022-03-20 18:39:43,452 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:43,452 INFO L85 PathProgramCache]: Analyzing trace with hash 56247409, now seen corresponding path program 1 times [2022-03-20 18:39:43,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:43,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411832150] [2022-03-20 18:39:43,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:43,453 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:43,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:43,457 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:43,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:43,460 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:43,460 INFO L85 PathProgramCache]: Analyzing trace with hash 1175455128, now seen corresponding path program 46 times [2022-03-20 18:39:43,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:43,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1199956779] [2022-03-20 18:39:43,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:43,461 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:43,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:43,818 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:43,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:43,825 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 24 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:43,825 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:43,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1199956779] [2022-03-20 18:39:43,825 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1199956779] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:43,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1083778372] [2022-03-20 18:39:43,825 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:39:43,825 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:43,826 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:43,827 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 18:39:43,827 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 18:39:43,874 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:39:43,874 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:43,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 50 conjunts are in the unsatisfiable core [2022-03-20 18:39:43,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:44,063 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 24 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:44,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:46,469 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 24 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:46,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1083778372] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:46,470 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:46,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 27] total 53 [2022-03-20 18:39:46,470 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:46,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [80660894] [2022-03-20 18:39:46,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [80660894] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:46,470 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:46,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-03-20 18:39:46,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808123040] [2022-03-20 18:39:46,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:46,470 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-03-20 18:39:46,470 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:46,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-03-20 18:39:46,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=753, Invalid=2003, Unknown=0, NotChecked=0, Total=2756 [2022-03-20 18:39:46,471 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 26 states have internal predecessors, (55), 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 18:39:47,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:47,178 INFO L93 Difference]: Finished difference Result 70 states and 74 transitions. [2022-03-20 18:39:47,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-03-20 18:39:47,178 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 26 states have internal predecessors, (55), 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 59 [2022-03-20 18:39:47,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:47,178 INFO L225 Difference]: With dead ends: 70 [2022-03-20 18:39:47,178 INFO L226 Difference]: Without dead ends: 63 [2022-03-20 18:39:47,179 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1495, Invalid=4357, Unknown=0, NotChecked=0, Total=5852 [2022-03-20 18:39:47,180 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 32 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 1186 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 1235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 1186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:47,180 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 99 Invalid, 1235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 1186 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 18:39:47,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-03-20 18:39:47,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-03-20 18:39:47,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 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 18:39:47,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2022-03-20 18:39:47,186 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 59 [2022-03-20 18:39:47,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:47,186 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2022-03-20 18:39:47,186 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 26 states have internal predecessors, (55), 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 18:39:47,186 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2022-03-20 18:39:47,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-03-20 18:39:47,186 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:47,186 INFO L499 BasicCegarLoop]: trace histogram [25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:47,202 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-03-20 18:39:47,399 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,SelfDestructingSolverStorable48,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:47,399 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:47,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:47,400 INFO L85 PathProgramCache]: Analyzing trace with hash 1977916213, now seen corresponding path program 47 times [2022-03-20 18:39:47,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:47,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [608001665] [2022-03-20 18:39:47,534 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:47,534 INFO L85 PathProgramCache]: Analyzing trace with hash 115352753, now seen corresponding path program 1 times [2022-03-20 18:39:47,534 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:47,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1276337483] [2022-03-20 18:39:47,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:47,534 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:47,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:47,539 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:47,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:47,542 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:47,542 INFO L85 PathProgramCache]: Analyzing trace with hash 1977916213, now seen corresponding path program 48 times [2022-03-20 18:39:47,542 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:47,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [632986756] [2022-03-20 18:39:47,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:47,542 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:47,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:47,902 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:47,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:47,909 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 25 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:47,910 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:47,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [632986756] [2022-03-20 18:39:47,910 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [632986756] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:47,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1539871074] [2022-03-20 18:39:47,910 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:39:47,910 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:47,910 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:47,911 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 18:39:47,913 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 18:39:47,940 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:39:47,940 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:47,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:39:47,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:48,126 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 72 proven. 1 refuted. 0 times theorem prover too weak. 552 trivial. 0 not checked. [2022-03-20 18:39:48,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:48,471 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 72 proven. 1 refuted. 0 times theorem prover too weak. 552 trivial. 0 not checked. [2022-03-20 18:39:48,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1539871074] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:48,471 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:48,471 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 4, 8] total 36 [2022-03-20 18:39:48,471 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:48,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [608001665] [2022-03-20 18:39:48,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [608001665] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:48,472 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:48,472 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-03-20 18:39:48,472 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540450048] [2022-03-20 18:39:48,472 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:48,472 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-03-20 18:39:48,472 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:48,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-03-20 18:39:48,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=1060, Unknown=0, NotChecked=0, Total=1260 [2022-03-20 18:39:48,473 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand has 28 states, 28 states have (on average 2.0357142857142856) internal successors, (57), 27 states have internal predecessors, (57), 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 18:39:49,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:49,332 INFO L93 Difference]: Finished difference Result 72 states and 76 transitions. [2022-03-20 18:39:49,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-20 18:39:49,333 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0357142857142856) internal successors, (57), 27 states have internal predecessors, (57), 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 61 [2022-03-20 18:39:49,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:49,333 INFO L225 Difference]: With dead ends: 72 [2022-03-20 18:39:49,333 INFO L226 Difference]: Without dead ends: 65 [2022-03-20 18:39:49,334 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 116 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 311 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=446, Invalid=3214, Unknown=0, NotChecked=0, Total=3660 [2022-03-20 18:39:49,334 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 33 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 1287 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 1338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 1287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:49,334 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 104 Invalid, 1338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 1287 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 18:39:49,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-03-20 18:39:49,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-03-20 18:39:49,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.05) internal successors, (63), 60 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 18:39:49,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2022-03-20 18:39:49,340 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 61 [2022-03-20 18:39:49,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:49,340 INFO L478 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2022-03-20 18:39:49,340 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.0357142857142856) internal successors, (57), 27 states have internal predecessors, (57), 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 18:39:49,340 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2022-03-20 18:39:49,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-03-20 18:39:49,341 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:49,341 INFO L499 BasicCegarLoop]: trace histogram [26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:49,357 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 18:39:49,555 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-03-20 18:39:49,555 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:49,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:49,556 INFO L85 PathProgramCache]: Analyzing trace with hash 48905618, now seen corresponding path program 49 times [2022-03-20 18:39:49,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:49,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1707878276] [2022-03-20 18:39:49,665 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:49,665 INFO L85 PathProgramCache]: Analyzing trace with hash 174458097, now seen corresponding path program 1 times [2022-03-20 18:39:49,666 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:49,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147862507] [2022-03-20 18:39:49,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:49,666 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:49,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:49,670 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:49,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:49,673 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:49,673 INFO L85 PathProgramCache]: Analyzing trace with hash 48905618, now seen corresponding path program 50 times [2022-03-20 18:39:49,673 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:49,673 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [364983649] [2022-03-20 18:39:49,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:49,674 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:49,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:50,069 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:50,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:50,072 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 26 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:50,072 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:50,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [364983649] [2022-03-20 18:39:50,072 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [364983649] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:50,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1913194907] [2022-03-20 18:39:50,072 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:39:50,072 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:50,072 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:50,073 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 18:39:50,084 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 18:39:50,140 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:39:50,140 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:50,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 54 conjunts are in the unsatisfiable core [2022-03-20 18:39:50,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:50,333 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 26 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:50,333 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:53,416 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 26 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:53,417 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1913194907] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:53,417 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:53,417 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 29] total 57 [2022-03-20 18:39:53,417 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:53,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1707878276] [2022-03-20 18:39:53,417 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1707878276] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:53,417 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:53,417 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-20 18:39:53,417 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850729716] [2022-03-20 18:39:53,417 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:53,418 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-20 18:39:53,418 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:53,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-20 18:39:53,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=867, Invalid=2325, Unknown=0, NotChecked=0, Total=3192 [2022-03-20 18:39:53,419 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand has 29 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 28 states have internal predecessors, (59), 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 18:39:54,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:54,244 INFO L93 Difference]: Finished difference Result 74 states and 78 transitions. [2022-03-20 18:39:54,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-20 18:39:54,245 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 28 states have internal predecessors, (59), 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 63 [2022-03-20 18:39:54,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:54,245 INFO L225 Difference]: With dead ends: 74 [2022-03-20 18:39:54,245 INFO L226 Difference]: Without dead ends: 67 [2022-03-20 18:39:54,246 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 99 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 408 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=1723, Invalid=5083, Unknown=0, NotChecked=0, Total=6806 [2022-03-20 18:39:54,246 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 34 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 1338 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 1391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 1338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:54,246 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 64 Invalid, 1391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 1338 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 18:39:54,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-03-20 18:39:54,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2022-03-20 18:39:54,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 62 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 18:39:54,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2022-03-20 18:39:54,252 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 63 [2022-03-20 18:39:54,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:54,253 INFO L478 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2022-03-20 18:39:54,253 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 28 states have internal predecessors, (59), 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 18:39:54,253 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2022-03-20 18:39:54,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-03-20 18:39:54,253 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:54,253 INFO L499 BasicCegarLoop]: trace histogram [27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:54,271 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 18:39:54,469 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,SelfDestructingSolverStorable51,SelfDestructingSolverStorable52 [2022-03-20 18:39:54,470 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:54,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:54,470 INFO L85 PathProgramCache]: Analyzing trace with hash 1695595695, now seen corresponding path program 51 times [2022-03-20 18:39:54,470 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:54,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1544288985] [2022-03-20 18:39:54,584 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:54,584 INFO L85 PathProgramCache]: Analyzing trace with hash 233563441, now seen corresponding path program 1 times [2022-03-20 18:39:54,584 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:54,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490894543] [2022-03-20 18:39:54,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:54,584 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:54,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:54,588 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:54,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:54,591 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:54,591 INFO L85 PathProgramCache]: Analyzing trace with hash 1695595695, now seen corresponding path program 52 times [2022-03-20 18:39:54,592 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:54,592 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656727291] [2022-03-20 18:39:54,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:54,592 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:54,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:55,006 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:55,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:55,022 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 27 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:55,022 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:55,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656727291] [2022-03-20 18:39:55,023 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1656727291] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:55,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1089964692] [2022-03-20 18:39:55,023 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:39:55,023 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:55,023 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:55,036 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 18:39:55,037 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 18:39:55,103 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:39:55,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:55,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 57 conjunts are in the unsatisfiable core [2022-03-20 18:39:55,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:39:55,329 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 18:39:55,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:39:58,290 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 18:39:58,290 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1089964692] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:39:58,290 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:39:58,290 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 60 [2022-03-20 18:39:58,290 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:39:58,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1544288985] [2022-03-20 18:39:58,290 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1544288985] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:39:58,290 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:39:58,290 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-20 18:39:58,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884793030] [2022-03-20 18:39:58,291 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:39:58,291 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-20 18:39:58,291 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:58,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-20 18:39:58,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=956, Invalid=2584, Unknown=0, NotChecked=0, Total=3540 [2022-03-20 18:39:58,292 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 29 states have internal predecessors, (61), 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 18:39:59,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:39:59,139 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2022-03-20 18:39:59,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-03-20 18:39:59,139 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 29 states have internal predecessors, (61), 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 65 [2022-03-20 18:39:59,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:39:59,139 INFO L225 Difference]: With dead ends: 76 [2022-03-20 18:39:59,139 INFO L226 Difference]: Without dead ends: 69 [2022-03-20 18:39:59,141 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 413 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=1872, Invalid=5610, Unknown=0, NotChecked=0, Total=7482 [2022-03-20 18:39:59,141 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 35 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 1399 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 1454 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 1399 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:39:59,141 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 29 Invalid, 1454 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 1399 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 18:39:59,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-03-20 18:39:59,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2022-03-20 18:39:59,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.046875) internal successors, (67), 64 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 18:39:59,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2022-03-20 18:39:59,147 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 65 [2022-03-20 18:39:59,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:39:59,147 INFO L478 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2022-03-20 18:39:59,147 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 29 states have internal predecessors, (61), 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 18:39:59,147 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2022-03-20 18:39:59,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-03-20 18:39:59,148 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:39:59,148 INFO L499 BasicCegarLoop]: trace histogram [28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:39:59,164 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 18:39:59,348 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,SelfDestructingSolverStorable53,SelfDestructingSolverStorable54 [2022-03-20 18:39:59,348 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:39:59,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:39:59,348 INFO L85 PathProgramCache]: Analyzing trace with hash -678172532, now seen corresponding path program 53 times [2022-03-20 18:39:59,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:39:59,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [299963099] [2022-03-20 18:39:59,459 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:39:59,459 INFO L85 PathProgramCache]: Analyzing trace with hash 292668785, now seen corresponding path program 1 times [2022-03-20 18:39:59,459 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:59,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1777713466] [2022-03-20 18:39:59,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:59,460 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:59,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:59,463 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:39:59,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:39:59,467 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:39:59,471 INFO L85 PathProgramCache]: Analyzing trace with hash -678172532, now seen corresponding path program 54 times [2022-03-20 18:39:59,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:39:59,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302294289] [2022-03-20 18:39:59,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:39:59,472 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:39:59,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:59,915 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:39:59,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:39:59,919 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 28 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:39:59,919 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:39:59,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302294289] [2022-03-20 18:39:59,919 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1302294289] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:39:59,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2037912899] [2022-03-20 18:39:59,919 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:39:59,919 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:39:59,919 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:39:59,920 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 18:39:59,921 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 18:39:59,950 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:39:59,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:39:59,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 18:39:59,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:40:00,175 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 81 proven. 1 refuted. 0 times theorem prover too weak. 702 trivial. 0 not checked. [2022-03-20 18:40:00,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:40:00,547 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 81 proven. 1 refuted. 0 times theorem prover too weak. 702 trivial. 0 not checked. [2022-03-20 18:40:00,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2037912899] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:40:00,547 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:40:00,547 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 4, 7] total 38 [2022-03-20 18:40:00,547 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:40:00,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [299963099] [2022-03-20 18:40:00,548 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [299963099] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:40:00,548 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:40:00,548 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-03-20 18:40:00,548 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908221724] [2022-03-20 18:40:00,548 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:40:00,548 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-03-20 18:40:00,548 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:00,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-03-20 18:40:00,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1195, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 18:40:00,549 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 31 states, 31 states have (on average 2.032258064516129) internal successors, (63), 30 states have internal predecessors, (63), 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 18:40:01,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:40:01,556 INFO L93 Difference]: Finished difference Result 78 states and 82 transitions. [2022-03-20 18:40:01,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-03-20 18:40:01,557 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.032258064516129) internal successors, (63), 30 states have internal predecessors, (63), 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 67 [2022-03-20 18:40:01,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:40:01,558 INFO L225 Difference]: With dead ends: 78 [2022-03-20 18:40:01,558 INFO L226 Difference]: Without dead ends: 71 [2022-03-20 18:40:01,559 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 129 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 392 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=483, Invalid=3807, Unknown=0, NotChecked=0, Total=4290 [2022-03-20 18:40:01,559 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 36 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 1560 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 1617 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 1560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:40:01,559 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 74 Invalid, 1617 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 1560 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:40:01,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-03-20 18:40:01,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2022-03-20 18:40:01,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 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 18:40:01,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2022-03-20 18:40:01,565 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 67 [2022-03-20 18:40:01,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:40:01,566 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2022-03-20 18:40:01,566 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.032258064516129) internal successors, (63), 30 states have internal predecessors, (63), 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 18:40:01,566 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2022-03-20 18:40:01,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-03-20 18:40:01,566 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:40:01,566 INFO L499 BasicCegarLoop]: trace histogram [29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:40:01,583 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2022-03-20 18:40:01,782 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2022-03-20 18:40:01,783 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:40:01,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:40:01,783 INFO L85 PathProgramCache]: Analyzing trace with hash -1241804503, now seen corresponding path program 55 times [2022-03-20 18:40:01,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:01,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [892082626] [2022-03-20 18:40:01,893 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:40:01,893 INFO L85 PathProgramCache]: Analyzing trace with hash 351774129, now seen corresponding path program 1 times [2022-03-20 18:40:01,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:01,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [951115420] [2022-03-20 18:40:01,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:01,894 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:01,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:01,897 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:40:01,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:01,901 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:40:01,906 INFO L85 PathProgramCache]: Analyzing trace with hash -1241804503, now seen corresponding path program 56 times [2022-03-20 18:40:01,906 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:01,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1151679504] [2022-03-20 18:40:01,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:01,906 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:01,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:02,393 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:40:02,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:02,396 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 29 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:02,396 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:40:02,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1151679504] [2022-03-20 18:40:02,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1151679504] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:40:02,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1027873820] [2022-03-20 18:40:02,396 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:40:02,396 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:40:02,396 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:40:02,397 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 18:40:02,399 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 18:40:02,456 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:40:02,456 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:40:02,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 60 conjunts are in the unsatisfiable core [2022-03-20 18:40:02,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:40:02,701 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 29 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:02,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:40:07,021 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 29 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:07,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1027873820] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:40:07,021 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:40:07,021 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 32] total 63 [2022-03-20 18:40:07,021 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:40:07,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [892082626] [2022-03-20 18:40:07,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [892082626] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:40:07,021 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:40:07,022 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-03-20 18:40:07,022 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480972081] [2022-03-20 18:40:07,022 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:40:07,022 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-03-20 18:40:07,022 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:07,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-03-20 18:40:07,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1053, Invalid=2853, Unknown=0, NotChecked=0, Total=3906 [2022-03-20 18:40:07,023 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 32 states, 32 states have (on average 2.03125) internal successors, (65), 31 states have internal predecessors, (65), 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 18:40:07,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:40:07,984 INFO L93 Difference]: Finished difference Result 80 states and 84 transitions. [2022-03-20 18:40:07,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-03-20 18:40:07,984 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.03125) internal successors, (65), 31 states have internal predecessors, (65), 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 69 [2022-03-20 18:40:07,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:40:07,985 INFO L225 Difference]: With dead ends: 80 [2022-03-20 18:40:07,985 INFO L226 Difference]: Without dead ends: 73 [2022-03-20 18:40:07,986 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 108 SyntacticMatches, 2 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 498 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=2095, Invalid=6277, Unknown=0, NotChecked=0, Total=8372 [2022-03-20 18:40:07,987 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 37 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 1635 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 1694 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 1635 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:40:07,987 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 44 Invalid, 1694 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 1635 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 18:40:07,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-03-20 18:40:07,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2022-03-20 18:40:07,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 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 18:40:07,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2022-03-20 18:40:07,993 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 69 [2022-03-20 18:40:07,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:40:07,993 INFO L478 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2022-03-20 18:40:07,993 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.03125) internal successors, (65), 31 states have internal predecessors, (65), 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 18:40:07,993 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2022-03-20 18:40:07,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-03-20 18:40:07,994 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:40:07,994 INFO L499 BasicCegarLoop]: trace histogram [30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:40:08,012 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 18:40:08,207 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,SelfDestructingSolverStorable58,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:40:08,207 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:40:08,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:40:08,208 INFO L85 PathProgramCache]: Analyzing trace with hash -1726249338, now seen corresponding path program 57 times [2022-03-20 18:40:08,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:08,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [503677761] [2022-03-20 18:40:08,328 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:40:08,328 INFO L85 PathProgramCache]: Analyzing trace with hash 410879473, now seen corresponding path program 1 times [2022-03-20 18:40:08,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:08,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1921859116] [2022-03-20 18:40:08,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:08,328 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:08,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:08,331 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:40:08,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:08,334 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:40:08,334 INFO L85 PathProgramCache]: Analyzing trace with hash -1726249338, now seen corresponding path program 58 times [2022-03-20 18:40:08,334 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:08,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [779244756] [2022-03-20 18:40:08,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:08,334 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:08,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:08,855 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:40:08,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:08,858 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 30 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:08,858 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:40:08,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [779244756] [2022-03-20 18:40:08,858 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [779244756] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:40:08,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1693855679] [2022-03-20 18:40:08,858 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:40:08,858 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:40:08,858 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:40:08,859 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 18:40:08,860 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 18:40:08,936 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:40:08,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:40:08,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 63 conjunts are in the unsatisfiable core [2022-03-20 18:40:08,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:40:09,162 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 18:40:09,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:40:13,534 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 18:40:13,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1693855679] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:40:13,535 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:40:13,535 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 66 [2022-03-20 18:40:13,535 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:40:13,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [503677761] [2022-03-20 18:40:13,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [503677761] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:40:13,535 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:40:13,535 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-03-20 18:40:13,535 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851811545] [2022-03-20 18:40:13,535 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:40:13,535 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-03-20 18:40:13,535 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:13,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-03-20 18:40:13,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1151, Invalid=3139, Unknown=0, NotChecked=0, Total=4290 [2022-03-20 18:40:13,536 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 32 states have internal predecessors, (67), 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 18:40:14,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:40:14,631 INFO L93 Difference]: Finished difference Result 82 states and 86 transitions. [2022-03-20 18:40:14,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-03-20 18:40:14,632 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 32 states have internal predecessors, (67), 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 71 [2022-03-20 18:40:14,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:40:14,632 INFO L225 Difference]: With dead ends: 82 [2022-03-20 18:40:14,632 INFO L226 Difference]: Without dead ends: 75 [2022-03-20 18:40:14,633 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 110 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 503 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=2259, Invalid=6861, Unknown=0, NotChecked=0, Total=9120 [2022-03-20 18:40:14,633 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 38 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 1858 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 1919 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 1858 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:40:14,634 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 134 Invalid, 1919 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 1858 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 18:40:14,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-03-20 18:40:14,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-03-20 18:40:14,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 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 18:40:14,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2022-03-20 18:40:14,640 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 71 [2022-03-20 18:40:14,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:40:14,640 INFO L478 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2022-03-20 18:40:14,640 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 32 states have internal predecessors, (67), 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 18:40:14,640 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2022-03-20 18:40:14,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-03-20 18:40:14,641 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:40:14,641 INFO L499 BasicCegarLoop]: trace histogram [31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:40:14,656 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-03-20 18:40:14,841 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2022-03-20 18:40:14,841 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:40:14,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:40:14,841 INFO L85 PathProgramCache]: Analyzing trace with hash 873699491, now seen corresponding path program 59 times [2022-03-20 18:40:14,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:14,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1257574268] [2022-03-20 18:40:14,948 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:40:14,948 INFO L85 PathProgramCache]: Analyzing trace with hash 469984817, now seen corresponding path program 1 times [2022-03-20 18:40:14,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:14,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56837551] [2022-03-20 18:40:14,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:14,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:14,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:14,957 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:40:14,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:14,960 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:40:14,961 INFO L85 PathProgramCache]: Analyzing trace with hash 873699491, now seen corresponding path program 60 times [2022-03-20 18:40:14,961 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:14,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [443688428] [2022-03-20 18:40:14,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:14,961 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:14,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:15,466 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:40:15,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:15,482 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 31 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:15,482 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:40:15,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [443688428] [2022-03-20 18:40:15,482 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [443688428] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:40:15,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1806655709] [2022-03-20 18:40:15,483 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:40:15,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:40:15,483 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:40:15,484 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 18:40:15,484 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 18:40:15,517 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:40:15,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:40:15,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:40:15,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:40:15,776 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 90 proven. 1 refuted. 0 times theorem prover too weak. 870 trivial. 0 not checked. [2022-03-20 18:40:15,777 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:40:16,202 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 90 proven. 1 refuted. 0 times theorem prover too weak. 870 trivial. 0 not checked. [2022-03-20 18:40:16,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1806655709] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:40:16,202 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:40:16,202 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 4, 8] total 42 [2022-03-20 18:40:16,202 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:40:16,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1257574268] [2022-03-20 18:40:16,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1257574268] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:40:16,202 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:40:16,203 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-03-20 18:40:16,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047207118] [2022-03-20 18:40:16,203 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:40:16,203 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-03-20 18:40:16,203 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:16,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-03-20 18:40:16,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=1480, Unknown=0, NotChecked=0, Total=1722 [2022-03-20 18:40:16,203 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand has 34 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 33 states have internal predecessors, (69), 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 18:40:17,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:40:17,381 INFO L93 Difference]: Finished difference Result 84 states and 88 transitions. [2022-03-20 18:40:17,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-03-20 18:40:17,382 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 33 states have internal predecessors, (69), 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 73 [2022-03-20 18:40:17,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:40:17,382 INFO L225 Difference]: With dead ends: 84 [2022-03-20 18:40:17,382 INFO L226 Difference]: Without dead ends: 77 [2022-03-20 18:40:17,383 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 140 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 476 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=548, Invalid=4708, Unknown=0, NotChecked=0, Total=5256 [2022-03-20 18:40:17,383 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 39 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 2019 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 2082 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 2019 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:40:17,383 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 169 Invalid, 2082 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 2019 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-20 18:40:17,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-03-20 18:40:17,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2022-03-20 18:40:17,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 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 18:40:17,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2022-03-20 18:40:17,389 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 73 [2022-03-20 18:40:17,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:40:17,390 INFO L478 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2022-03-20 18:40:17,390 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 33 states have internal predecessors, (69), 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 18:40:17,390 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2022-03-20 18:40:17,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-03-20 18:40:17,390 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:40:17,390 INFO L499 BasicCegarLoop]: trace histogram [32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:40:17,405 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 18:40:17,592 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,SelfDestructingSolverStorable61,SelfDestructingSolverStorable62 [2022-03-20 18:40:17,593 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:40:17,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:40:17,593 INFO L85 PathProgramCache]: Analyzing trace with hash -246442112, now seen corresponding path program 61 times [2022-03-20 18:40:17,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:17,593 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [88462036] [2022-03-20 18:40:17,728 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:40:17,728 INFO L85 PathProgramCache]: Analyzing trace with hash 529090161, now seen corresponding path program 1 times [2022-03-20 18:40:17,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:17,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [29819014] [2022-03-20 18:40:17,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:17,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:17,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:17,731 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:40:17,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:17,734 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:40:17,734 INFO L85 PathProgramCache]: Analyzing trace with hash -246442112, now seen corresponding path program 62 times [2022-03-20 18:40:17,734 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:17,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411715008] [2022-03-20 18:40:17,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:17,735 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:17,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:18,254 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:40:18,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:18,264 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 32 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:18,264 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:40:18,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411715008] [2022-03-20 18:40:18,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411715008] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:40:18,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [73870627] [2022-03-20 18:40:18,264 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:40:18,264 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:40:18,265 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:40:18,267 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 18:40:18,276 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 18:40:18,342 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:40:18,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:40:18,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 66 conjunts are in the unsatisfiable core [2022-03-20 18:40:18,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:40:18,570 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 32 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:18,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:40:24,664 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 32 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:24,664 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [73870627] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:40:24,665 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:40:24,665 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 35] total 69 [2022-03-20 18:40:24,665 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:40:24,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [88462036] [2022-03-20 18:40:24,665 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [88462036] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:40:24,665 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:40:24,665 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-03-20 18:40:24,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383684312] [2022-03-20 18:40:24,665 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:40:24,665 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-03-20 18:40:24,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:24,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-03-20 18:40:24,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1257, Invalid=3435, Unknown=0, NotChecked=0, Total=4692 [2022-03-20 18:40:24,666 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 35 states, 35 states have (on average 2.0285714285714285) internal successors, (71), 34 states have internal predecessors, (71), 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 18:40:25,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:40:25,906 INFO L93 Difference]: Finished difference Result 86 states and 90 transitions. [2022-03-20 18:40:25,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-03-20 18:40:25,907 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.0285714285714285) internal successors, (71), 34 states have internal predecessors, (71), 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 75 [2022-03-20 18:40:25,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:40:25,907 INFO L225 Difference]: With dead ends: 86 [2022-03-20 18:40:25,907 INFO L226 Difference]: Without dead ends: 79 [2022-03-20 18:40:25,908 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 117 SyntacticMatches, 2 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 597 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=2503, Invalid=7597, Unknown=0, NotChecked=0, Total=10100 [2022-03-20 18:40:25,908 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 40 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 2130 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 2195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 2130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:40:25,908 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 159 Invalid, 2195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 2130 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-20 18:40:25,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-03-20 18:40:25,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2022-03-20 18:40:25,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 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 18:40:25,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2022-03-20 18:40:25,915 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 75 [2022-03-20 18:40:25,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:40:25,915 INFO L478 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2022-03-20 18:40:25,915 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.0285714285714285) internal successors, (71), 34 states have internal predecessors, (71), 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 18:40:25,915 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2022-03-20 18:40:25,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-03-20 18:40:25,916 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:40:25,916 INFO L499 BasicCegarLoop]: trace histogram [33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:40:25,932 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-03-20 18:40:26,131 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,SelfDestructingSolverStorable64,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:40:26,132 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:40:26,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:40:26,132 INFO L85 PathProgramCache]: Analyzing trace with hash 1334268701, now seen corresponding path program 63 times [2022-03-20 18:40:26,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:26,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [229562117] [2022-03-20 18:40:26,242 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:40:26,242 INFO L85 PathProgramCache]: Analyzing trace with hash 588195505, now seen corresponding path program 1 times [2022-03-20 18:40:26,242 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:26,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652742176] [2022-03-20 18:40:26,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:26,243 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:26,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:26,246 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:40:26,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:26,253 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:40:26,253 INFO L85 PathProgramCache]: Analyzing trace with hash 1334268701, now seen corresponding path program 64 times [2022-03-20 18:40:26,253 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:26,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18347956] [2022-03-20 18:40:26,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:26,253 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:26,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:26,819 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:40:26,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:26,830 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 33 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:26,831 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:40:26,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18347956] [2022-03-20 18:40:26,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [18347956] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:40:26,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [829454297] [2022-03-20 18:40:26,831 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:40:26,831 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:40:26,831 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:40:26,832 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 18:40:26,833 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 18:40:26,884 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:40:26,884 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:40:26,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 68 conjunts are in the unsatisfiable core [2022-03-20 18:40:26,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:40:27,111 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 33 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:27,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:40:34,553 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 33 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:34,554 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [829454297] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:40:34,554 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:40:34,554 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 36] total 71 [2022-03-20 18:40:34,554 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:40:34,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [229562117] [2022-03-20 18:40:34,554 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [229562117] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:40:34,554 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:40:34,554 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-03-20 18:40:34,554 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888790918] [2022-03-20 18:40:34,554 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:40:34,554 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-03-20 18:40:34,554 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:34,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-03-20 18:40:34,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1329, Invalid=3641, Unknown=0, NotChecked=0, Total=4970 [2022-03-20 18:40:34,555 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 35 states have internal predecessors, (73), 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 18:40:35,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:40:35,853 INFO L93 Difference]: Finished difference Result 88 states and 92 transitions. [2022-03-20 18:40:35,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-03-20 18:40:35,854 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 35 states have internal predecessors, (73), 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 77 [2022-03-20 18:40:35,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:40:35,854 INFO L225 Difference]: With dead ends: 88 [2022-03-20 18:40:35,854 INFO L226 Difference]: Without dead ends: 81 [2022-03-20 18:40:35,855 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 120 SyntacticMatches, 2 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 632 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=2647, Invalid=8065, Unknown=0, NotChecked=0, Total=10712 [2022-03-20 18:40:35,855 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 41 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 2179 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 2246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 2179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:40:35,856 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 94 Invalid, 2246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 2179 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-20 18:40:35,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-03-20 18:40:35,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2022-03-20 18:40:35,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 76 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 18:40:35,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2022-03-20 18:40:35,869 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 77 [2022-03-20 18:40:35,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:40:35,869 INFO L478 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2022-03-20 18:40:35,870 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 35 states have internal predecessors, (73), 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 18:40:35,870 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2022-03-20 18:40:35,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-03-20 18:40:35,870 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:40:35,870 INFO L499 BasicCegarLoop]: trace histogram [34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:40:35,887 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-03-20 18:40:36,082 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,SelfDestructingSolverStorable66,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:40:36,082 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:40:36,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:40:36,083 INFO L85 PathProgramCache]: Analyzing trace with hash -21062790, now seen corresponding path program 65 times [2022-03-20 18:40:36,083 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:36,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [346176397] [2022-03-20 18:40:36,221 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:40:36,221 INFO L85 PathProgramCache]: Analyzing trace with hash 647300849, now seen corresponding path program 1 times [2022-03-20 18:40:36,221 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:36,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949623430] [2022-03-20 18:40:36,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:36,221 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:36,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:36,225 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:40:36,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:36,228 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:40:36,228 INFO L85 PathProgramCache]: Analyzing trace with hash -21062790, now seen corresponding path program 66 times [2022-03-20 18:40:36,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:36,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [759535973] [2022-03-20 18:40:36,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:36,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:36,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:36,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:40:36,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:36,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 34 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:36,820 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:40:36,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [759535973] [2022-03-20 18:40:36,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [759535973] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:40:36,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762624580] [2022-03-20 18:40:36,820 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:40:36,820 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:40:36,820 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:40:36,821 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 18:40:36,822 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 18:40:36,943 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:40:36,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:40:36,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:40:36,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:40:37,284 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 99 proven. 1 refuted. 0 times theorem prover too weak. 1056 trivial. 0 not checked. [2022-03-20 18:40:37,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:40:37,857 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 99 proven. 1 refuted. 0 times theorem prover too weak. 1056 trivial. 0 not checked. [2022-03-20 18:40:37,857 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [762624580] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:40:37,857 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:40:37,857 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 4, 8] total 45 [2022-03-20 18:40:37,857 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:40:37,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [346176397] [2022-03-20 18:40:37,857 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [346176397] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:40:37,857 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:40:37,858 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-03-20 18:40:37,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886687601] [2022-03-20 18:40:37,858 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:40:37,858 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-03-20 18:40:37,858 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:37,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-03-20 18:40:37,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1717, Unknown=0, NotChecked=0, Total=1980 [2022-03-20 18:40:37,858 INFO L87 Difference]: Start difference. First operand 81 states and 83 transitions. Second operand has 37 states, 37 states have (on average 2.027027027027027) internal successors, (75), 36 states have internal predecessors, (75), 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 18:40:39,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:40:39,444 INFO L93 Difference]: Finished difference Result 90 states and 94 transitions. [2022-03-20 18:40:39,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-03-20 18:40:39,444 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.027027027027027) internal successors, (75), 36 states have internal predecessors, (75), 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 79 [2022-03-20 18:40:39,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:40:39,445 INFO L225 Difference]: With dead ends: 90 [2022-03-20 18:40:39,445 INFO L226 Difference]: Without dead ends: 83 [2022-03-20 18:40:39,445 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 152 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 572 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=599, Invalid=5563, Unknown=0, NotChecked=0, Total=6162 [2022-03-20 18:40:39,446 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 42 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 2280 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 2349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 2280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:40:39,446 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 69 Invalid, 2349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 2280 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-20 18:40:39,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-03-20 18:40:39,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2022-03-20 18:40:39,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 78 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 18:40:39,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2022-03-20 18:40:39,457 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 79 [2022-03-20 18:40:39,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:40:39,457 INFO L478 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2022-03-20 18:40:39,457 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.027027027027027) internal successors, (75), 36 states have internal predecessors, (75), 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 18:40:39,458 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2022-03-20 18:40:39,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-03-20 18:40:39,458 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:40:39,458 INFO L499 BasicCegarLoop]: trace histogram [35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:40:39,464 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-03-20 18:40:39,659 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,SelfDestructingSolverStorable67,SelfDestructingSolverStorable68 [2022-03-20 18:40:39,660 INFO L403 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:40:39,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:40:39,660 INFO L85 PathProgramCache]: Analyzing trace with hash -1119534953, now seen corresponding path program 67 times [2022-03-20 18:40:39,660 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:39,660 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1256964660] [2022-03-20 18:40:39,785 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:40:39,786 INFO L85 PathProgramCache]: Analyzing trace with hash 706406193, now seen corresponding path program 1 times [2022-03-20 18:40:39,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:39,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [480293083] [2022-03-20 18:40:39,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:39,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:39,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:39,789 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:40:39,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:39,792 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:40:39,792 INFO L85 PathProgramCache]: Analyzing trace with hash -1119534953, now seen corresponding path program 68 times [2022-03-20 18:40:39,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:39,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [900446928] [2022-03-20 18:40:39,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:39,792 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:39,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:40,419 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:40:40,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:40,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 35 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:40,422 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:40:40,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [900446928] [2022-03-20 18:40:40,422 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [900446928] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:40:40,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1369514710] [2022-03-20 18:40:40,422 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:40:40,422 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:40:40,422 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:40:40,423 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 18:40:40,424 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 18:40:40,512 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:40:40,513 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:40:40,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 72 conjunts are in the unsatisfiable core [2022-03-20 18:40:40,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:40:40,763 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 35 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:40,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:40:50,500 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 35 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:50,500 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1369514710] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:40:50,500 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:40:50,500 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 38] total 75 [2022-03-20 18:40:50,500 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:40:50,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1256964660] [2022-03-20 18:40:50,501 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1256964660] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:40:50,501 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:40:50,501 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-03-20 18:40:50,501 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822210717] [2022-03-20 18:40:50,501 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:40:50,501 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-03-20 18:40:50,501 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:50,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-03-20 18:40:50,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1479, Invalid=4071, Unknown=0, NotChecked=0, Total=5550 [2022-03-20 18:40:50,502 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 38 states, 38 states have (on average 2.026315789473684) internal successors, (77), 37 states have internal predecessors, (77), 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 18:40:51,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:40:51,942 INFO L93 Difference]: Finished difference Result 92 states and 96 transitions. [2022-03-20 18:40:51,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-03-20 18:40:51,943 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.026315789473684) internal successors, (77), 37 states have internal predecessors, (77), 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 81 [2022-03-20 18:40:51,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:40:51,943 INFO L225 Difference]: With dead ends: 92 [2022-03-20 18:40:51,943 INFO L226 Difference]: Without dead ends: 85 [2022-03-20 18:40:51,944 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 705 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=2947, Invalid=9043, Unknown=0, NotChecked=0, Total=11990 [2022-03-20 18:40:51,944 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 43 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 2367 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 2438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 2367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-03-20 18:40:51,945 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 29 Invalid, 2438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 2367 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-03-20 18:40:51,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-03-20 18:40:51,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2022-03-20 18:40:51,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0375) internal successors, (83), 80 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 18:40:51,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2022-03-20 18:40:51,952 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 81 [2022-03-20 18:40:51,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:40:51,952 INFO L478 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2022-03-20 18:40:51,952 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.026315789473684) internal successors, (77), 37 states have internal predecessors, (77), 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 18:40:51,952 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2022-03-20 18:40:51,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-03-20 18:40:51,952 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:40:51,952 INFO L499 BasicCegarLoop]: trace histogram [36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:40:51,969 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 18:40:52,157 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2022-03-20 18:40:52,157 INFO L403 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:40:52,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:40:52,158 INFO L85 PathProgramCache]: Analyzing trace with hash -189328780, now seen corresponding path program 69 times [2022-03-20 18:40:52,158 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:40:52,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [873704068] [2022-03-20 18:40:52,268 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:40:52,268 INFO L85 PathProgramCache]: Analyzing trace with hash 765511537, now seen corresponding path program 1 times [2022-03-20 18:40:52,268 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:52,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [863387636] [2022-03-20 18:40:52,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:52,268 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:52,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:52,272 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:40:52,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:40:52,275 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:40:52,275 INFO L85 PathProgramCache]: Analyzing trace with hash -189328780, now seen corresponding path program 70 times [2022-03-20 18:40:52,275 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:40:52,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650438542] [2022-03-20 18:40:52,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:40:52,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:40:52,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:52,914 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:40:52,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:40:52,917 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 36 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:52,917 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:40:52,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650438542] [2022-03-20 18:40:52,917 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650438542] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:40:52,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1485539871] [2022-03-20 18:40:52,917 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:40:52,917 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:40:52,917 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:40:52,918 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 18:40:52,919 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 18:40:52,999 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:40:53,000 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:40:53,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 74 conjunts are in the unsatisfiable core [2022-03-20 18:40:53,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:40:53,251 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 36 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:40:53,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:41:05,094 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 36 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:41:05,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1485539871] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:41:05,095 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:41:05,095 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 39] total 77 [2022-03-20 18:41:05,095 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:41:05,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [873704068] [2022-03-20 18:41:05,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [873704068] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:41:05,095 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:41:05,095 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-03-20 18:41:05,095 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643932150] [2022-03-20 18:41:05,095 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:41:05,095 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-03-20 18:41:05,095 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:41:05,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-03-20 18:41:05,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1557, Invalid=4295, Unknown=0, NotChecked=0, Total=5852 [2022-03-20 18:41:05,096 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 38 states have internal predecessors, (79), 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 18:41:06,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:41:06,615 INFO L93 Difference]: Finished difference Result 94 states and 98 transitions. [2022-03-20 18:41:06,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-03-20 18:41:06,615 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 38 states have internal predecessors, (79), 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 83 [2022-03-20 18:41:06,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:41:06,615 INFO L225 Difference]: With dead ends: 94 [2022-03-20 18:41:06,616 INFO L226 Difference]: Without dead ends: 87 [2022-03-20 18:41:06,616 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 743 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=3103, Invalid=9553, Unknown=0, NotChecked=0, Total=12656 [2022-03-20 18:41:06,616 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 44 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 2572 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 2645 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 2572 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-03-20 18:41:06,617 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 84 Invalid, 2645 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 2572 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-03-20 18:41:06,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-03-20 18:41:06,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2022-03-20 18:41:06,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 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 18:41:06,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2022-03-20 18:41:06,624 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 83 [2022-03-20 18:41:06,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:41:06,624 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2022-03-20 18:41:06,624 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 38 states have internal predecessors, (79), 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 18:41:06,624 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2022-03-20 18:41:06,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-03-20 18:41:06,624 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:41:06,624 INFO L499 BasicCegarLoop]: trace histogram [37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:41:06,641 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 18:41:06,825 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,SelfDestructingSolverStorable72,36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:41:06,825 INFO L403 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:41:06,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:41:06,825 INFO L85 PathProgramCache]: Analyzing trace with hash 385605905, now seen corresponding path program 71 times [2022-03-20 18:41:06,825 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:41:06,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1458960350] [2022-03-20 18:41:06,961 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:41:06,961 INFO L85 PathProgramCache]: Analyzing trace with hash 824616881, now seen corresponding path program 1 times [2022-03-20 18:41:06,961 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:41:06,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546427305] [2022-03-20 18:41:06,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:41:06,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:41:06,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:41:06,965 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:41:06,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:41:06,969 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:41:06,969 INFO L85 PathProgramCache]: Analyzing trace with hash 385605905, now seen corresponding path program 72 times [2022-03-20 18:41:06,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:41:06,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [328532986] [2022-03-20 18:41:06,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:41:06,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:41:06,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:41:07,664 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:41:07,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:41:07,673 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 37 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:41:07,673 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:41:07,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [328532986] [2022-03-20 18:41:07,674 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [328532986] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:41:07,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [126550609] [2022-03-20 18:41:07,674 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:41:07,674 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:41:07,674 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:41:07,676 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 18:41:07,676 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 18:41:07,722 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:41:07,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:41:07,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:41:07,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:41:08,148 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 108 proven. 1 refuted. 0 times theorem prover too weak. 1260 trivial. 0 not checked. [2022-03-20 18:41:08,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:41:08,842 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 108 proven. 1 refuted. 0 times theorem prover too weak. 1260 trivial. 0 not checked. [2022-03-20 18:41:08,842 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [126550609] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:41:08,842 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:41:08,842 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 4, 8] total 48 [2022-03-20 18:41:08,843 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:41:08,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1458960350] [2022-03-20 18:41:08,843 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1458960350] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:41:08,843 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:41:08,843 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-03-20 18:41:08,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944537818] [2022-03-20 18:41:08,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:41:08,843 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-03-20 18:41:08,844 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:41:08,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-03-20 18:41:08,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=1972, Unknown=0, NotChecked=0, Total=2256 [2022-03-20 18:41:08,844 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 40 states, 40 states have (on average 2.025) internal successors, (81), 39 states have internal predecessors, (81), 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 18:41:10,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:41:10,786 INFO L93 Difference]: Finished difference Result 96 states and 100 transitions. [2022-03-20 18:41:10,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-03-20 18:41:10,787 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.025) internal successors, (81), 39 states have internal predecessors, (81), 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 85 [2022-03-20 18:41:10,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:41:10,791 INFO L225 Difference]: With dead ends: 96 [2022-03-20 18:41:10,791 INFO L226 Difference]: Without dead ends: 89 [2022-03-20 18:41:10,792 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 164 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 677 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=650, Invalid=6490, Unknown=0, NotChecked=0, Total=7140 [2022-03-20 18:41:10,792 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 45 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 2685 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 2760 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 2685 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:41:10,792 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 59 Invalid, 2760 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 2685 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-20 18:41:10,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-03-20 18:41:10,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2022-03-20 18:41:10,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 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 18:41:10,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2022-03-20 18:41:10,801 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 85 [2022-03-20 18:41:10,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:41:10,801 INFO L478 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2022-03-20 18:41:10,801 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.025) internal successors, (81), 39 states have internal predecessors, (81), 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 18:41:10,802 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2022-03-20 18:41:10,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-03-20 18:41:10,802 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:41:10,802 INFO L499 BasicCegarLoop]: trace histogram [38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:41:10,806 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2022-03-20 18:41:11,002 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,SelfDestructingSolverStorable74,37 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:41:11,002 INFO L403 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:41:11,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:41:11,003 INFO L85 PathProgramCache]: Analyzing trace with hash -1152942994, now seen corresponding path program 73 times [2022-03-20 18:41:11,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:41:11,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1584183503] [2022-03-20 18:41:11,116 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:41:11,116 INFO L85 PathProgramCache]: Analyzing trace with hash 883722225, now seen corresponding path program 1 times [2022-03-20 18:41:11,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:41:11,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [316128596] [2022-03-20 18:41:11,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:41:11,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:41:11,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:41:11,120 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:41:11,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:41:11,123 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:41:11,123 INFO L85 PathProgramCache]: Analyzing trace with hash -1152942994, now seen corresponding path program 74 times [2022-03-20 18:41:11,123 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:41:11,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [735709112] [2022-03-20 18:41:11,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:41:11,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:41:11,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:41:11,849 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:41:11,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:41:11,852 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 38 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:41:11,852 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:41:11,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [735709112] [2022-03-20 18:41:11,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [735709112] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:41:11,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769513343] [2022-03-20 18:41:11,852 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:41:11,853 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:41:11,853 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:41:11,854 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 18:41:11,854 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 18:41:11,917 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:41:11,917 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:41:11,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 82 conjunts are in the unsatisfiable core [2022-03-20 18:41:11,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:41:12,324 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 18:41:12,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:41:20,194 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 18:41:20,195 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769513343] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:41:20,195 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:41:20,195 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 44] total 85 [2022-03-20 18:41:20,195 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:41:20,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1584183503] [2022-03-20 18:41:20,195 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1584183503] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:41:20,195 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:41:20,195 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-03-20 18:41:20,195 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2286743] [2022-03-20 18:41:20,195 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:41:20,196 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-03-20 18:41:20,196 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:41:20,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-03-20 18:41:20,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1766, Invalid=5374, Unknown=0, NotChecked=0, Total=7140 [2022-03-20 18:41:20,197 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand has 41 states, 41 states have (on average 2.024390243902439) internal successors, (83), 40 states have internal predecessors, (83), 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 18:41:22,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:41:22,307 INFO L93 Difference]: Finished difference Result 98 states and 102 transitions. [2022-03-20 18:41:22,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-03-20 18:41:22,308 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.024390243902439) internal successors, (83), 40 states have internal predecessors, (83), 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 87 [2022-03-20 18:41:22,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:41:22,308 INFO L225 Difference]: With dead ends: 98 [2022-03-20 18:41:22,308 INFO L226 Difference]: Without dead ends: 91 [2022-03-20 18:41:22,310 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 831 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=3474, Invalid=11532, Unknown=0, NotChecked=0, Total=15006 [2022-03-20 18:41:22,310 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 46 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 2814 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 2891 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 2814 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:41:22,310 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 44 Invalid, 2891 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 2814 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-20 18:41:22,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-03-20 18:41:22,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2022-03-20 18:41:22,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0348837209302326) internal successors, (89), 86 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 18:41:22,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 93 transitions. [2022-03-20 18:41:22,320 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 93 transitions. Word has length 87 [2022-03-20 18:41:22,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:41:22,320 INFO L478 AbstractCegarLoop]: Abstraction has 91 states and 93 transitions. [2022-03-20 18:41:22,320 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.024390243902439) internal successors, (83), 40 states have internal predecessors, (83), 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 18:41:22,320 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 93 transitions. [2022-03-20 18:41:22,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-03-20 18:41:22,320 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:41:22,320 INFO L499 BasicCegarLoop]: trace histogram [39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:41:22,337 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2022-03-20 18:41:22,521 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,SelfDestructingSolverStorable76,38 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:41:22,521 INFO L403 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:41:22,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:41:22,521 INFO L85 PathProgramCache]: Analyzing trace with hash 2065282187, now seen corresponding path program 75 times [2022-03-20 18:41:22,521 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:41:22,521 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [261027363] [2022-03-20 18:41:22,633 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:41:22,633 INFO L85 PathProgramCache]: Analyzing trace with hash 942827569, now seen corresponding path program 1 times [2022-03-20 18:41:22,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:41:22,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1020468330] [2022-03-20 18:41:22,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:41:22,633 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:41:22,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:41:22,637 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:41:22,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:41:22,652 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:41:22,652 INFO L85 PathProgramCache]: Analyzing trace with hash 2065282187, now seen corresponding path program 76 times [2022-03-20 18:41:22,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:41:22,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [258852100] [2022-03-20 18:41:22,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:41:22,652 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:41:22,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:41:23,388 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:41:23,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:41:23,391 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 39 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:41:23,391 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:41:23,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [258852100] [2022-03-20 18:41:23,391 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [258852100] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:41:23,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [346517060] [2022-03-20 18:41:23,391 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:41:23,391 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:41:23,391 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:41:23,392 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 18:41:23,393 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 18:41:23,452 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:41:23,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:41:23,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 80 conjunts are in the unsatisfiable core [2022-03-20 18:41:23,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:41:23,711 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 39 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:41:23,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:41:41,399 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 39 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:41:41,399 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [346517060] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:41:41,399 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:41:41,399 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 42] total 83 [2022-03-20 18:41:41,399 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:41:41,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [261027363] [2022-03-20 18:41:41,399 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [261027363] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:41:41,399 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:41:41,399 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-03-20 18:41:41,399 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022426255] [2022-03-20 18:41:41,400 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:41:41,400 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-03-20 18:41:41,400 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:41:41,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-03-20 18:41:41,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1803, Invalid=5003, Unknown=0, NotChecked=0, Total=6806 [2022-03-20 18:41:41,401 INFO L87 Difference]: Start difference. First operand 91 states and 93 transitions. Second operand has 42 states, 42 states have (on average 2.0238095238095237) internal successors, (85), 41 states have internal predecessors, (85), 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 18:41:43,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:41:43,057 INFO L93 Difference]: Finished difference Result 100 states and 104 transitions. [2022-03-20 18:41:43,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-03-20 18:41:43,057 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.0238095238095237) internal successors, (85), 41 states have internal predecessors, (85), 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 89 [2022-03-20 18:41:43,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:41:43,058 INFO L225 Difference]: With dead ends: 100 [2022-03-20 18:41:43,058 INFO L226 Difference]: Without dead ends: 93 [2022-03-20 18:41:43,059 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 138 SyntacticMatches, 2 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 863 ImplicationChecksByTransitivity, 18.2s TimeCoverageRelationStatistics Valid=3595, Invalid=11167, Unknown=0, NotChecked=0, Total=14762 [2022-03-20 18:41:43,060 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 47 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 3103 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 3182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 3103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-20 18:41:43,060 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 159 Invalid, 3182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 3103 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-20 18:41:43,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-03-20 18:41:43,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2022-03-20 18:41:43,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 88 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 18:41:43,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2022-03-20 18:41:43,067 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 89 [2022-03-20 18:41:43,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:41:43,067 INFO L478 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2022-03-20 18:41:43,067 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.0238095238095237) internal successors, (85), 41 states have internal predecessors, (85), 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 18:41:43,067 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2022-03-20 18:41:43,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-03-20 18:41:43,068 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:41:43,068 INFO L499 BasicCegarLoop]: trace histogram [40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:41:43,085 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 18:41:43,272 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,SelfDestructingSolverStorable77,SelfDestructingSolverStorable78 [2022-03-20 18:41:43,273 INFO L403 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:41:43,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:41:43,273 INFO L85 PathProgramCache]: Analyzing trace with hash -1891739288, now seen corresponding path program 77 times [2022-03-20 18:41:43,273 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:41:43,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [885012711] [2022-03-20 18:41:43,416 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:41:43,417 INFO L85 PathProgramCache]: Analyzing trace with hash 1001932913, now seen corresponding path program 1 times [2022-03-20 18:41:43,417 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:41:43,417 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1541392193] [2022-03-20 18:41:43,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:41:43,417 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:41:43,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:41:43,428 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:41:43,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:41:43,434 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:41:43,434 INFO L85 PathProgramCache]: Analyzing trace with hash -1891739288, now seen corresponding path program 78 times [2022-03-20 18:41:43,434 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:41:43,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1373566829] [2022-03-20 18:41:43,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:41:43,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:41:43,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:41:44,210 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:41:44,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:41:44,213 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 40 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:41:44,213 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:41:44,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1373566829] [2022-03-20 18:41:44,213 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1373566829] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:41:44,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [655399806] [2022-03-20 18:41:44,213 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:41:44,213 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:41:44,213 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:41:44,214 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 18:41:44,215 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 18:41:44,248 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:41:44,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:41:44,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 18:41:44,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:41:44,844 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 117 proven. 1 refuted. 0 times theorem prover too weak. 1482 trivial. 0 not checked. [2022-03-20 18:41:44,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:41:45,760 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 117 proven. 1 refuted. 0 times theorem prover too weak. 1482 trivial. 0 not checked. [2022-03-20 18:41:45,760 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [655399806] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:41:45,760 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:41:45,760 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 4, 8] total 51 [2022-03-20 18:41:45,760 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:41:45,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [885012711] [2022-03-20 18:41:45,760 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [885012711] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:41:45,760 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:41:45,760 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-03-20 18:41:45,760 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189227563] [2022-03-20 18:41:45,761 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:41:45,761 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-03-20 18:41:45,761 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:41:45,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-03-20 18:41:45,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=2245, Unknown=0, NotChecked=0, Total=2550 [2022-03-20 18:41:45,762 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 43 states, 43 states have (on average 2.0232558139534884) internal successors, (87), 42 states have internal predecessors, (87), 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 18:41:48,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:41:48,128 INFO L93 Difference]: Finished difference Result 102 states and 106 transitions. [2022-03-20 18:41:48,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-03-20 18:41:48,129 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.0232558139534884) internal successors, (87), 42 states have internal predecessors, (87), 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 91 [2022-03-20 18:41:48,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:41:48,129 INFO L225 Difference]: With dead ends: 102 [2022-03-20 18:41:48,129 INFO L226 Difference]: Without dead ends: 95 [2022-03-20 18:41:48,130 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 176 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 791 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=701, Invalid=7489, Unknown=0, NotChecked=0, Total=8190 [2022-03-20 18:41:48,130 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 48 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 3252 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 3333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 3252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:41:48,130 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 154 Invalid, 3333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 3252 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-20 18:41:48,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-03-20 18:41:48,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2022-03-20 18:41:48,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.0333333333333334) internal successors, (93), 90 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 18:41:48,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2022-03-20 18:41:48,138 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 91 [2022-03-20 18:41:48,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:41:48,138 INFO L478 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2022-03-20 18:41:48,138 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.0232558139534884) internal successors, (87), 42 states have internal predecessors, (87), 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 18:41:48,139 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2022-03-20 18:41:48,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2022-03-20 18:41:48,139 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:41:48,139 INFO L499 BasicCegarLoop]: trace histogram [41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:41:48,155 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 18:41:48,351 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,40 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable79 [2022-03-20 18:41:48,352 INFO L403 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:41:48,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:41:48,352 INFO L85 PathProgramCache]: Analyzing trace with hash 751647493, now seen corresponding path program 79 times [2022-03-20 18:41:48,352 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:41:48,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [45208274] [2022-03-20 18:41:48,473 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:41:48,473 INFO L85 PathProgramCache]: Analyzing trace with hash 1061038257, now seen corresponding path program 1 times [2022-03-20 18:41:48,473 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:41:48,473 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [180973451] [2022-03-20 18:41:48,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:41:48,474 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:41:48,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:41:48,476 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:41:48,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:41:48,481 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:41:48,481 INFO L85 PathProgramCache]: Analyzing trace with hash 751647493, now seen corresponding path program 80 times [2022-03-20 18:41:48,481 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:41:48,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113620842] [2022-03-20 18:41:48,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:41:48,481 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:41:48,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:41:49,330 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:41:49,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:41:49,333 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 41 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:41:49,333 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:41:49,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113620842] [2022-03-20 18:41:49,333 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1113620842] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:41:49,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [962017697] [2022-03-20 18:41:49,333 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:41:49,333 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:41:49,333 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:41:49,334 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 18:41:49,334 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 18:41:49,432 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:41:49,432 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:41:49,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 88 conjunts are in the unsatisfiable core [2022-03-20 18:41:49,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:41:49,727 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 18:41:49,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:42:01,953 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 18:42:01,953 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [962017697] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:42:01,953 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:42:01,953 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 47] total 91 [2022-03-20 18:42:01,954 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:42:01,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [45208274] [2022-03-20 18:42:01,954 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [45208274] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:42:01,954 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:42:01,954 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-03-20 18:42:01,954 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492387703] [2022-03-20 18:42:01,954 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:42:01,954 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-03-20 18:42:01,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:42:01,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-03-20 18:42:01,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2027, Invalid=6163, Unknown=0, NotChecked=0, Total=8190 [2022-03-20 18:42:01,955 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 44 states, 44 states have (on average 2.022727272727273) internal successors, (89), 43 states have internal predecessors, (89), 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 18:42:04,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:42:04,439 INFO L93 Difference]: Finished difference Result 104 states and 108 transitions. [2022-03-20 18:42:04,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-03-20 18:42:04,440 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.022727272727273) internal successors, (89), 43 states have internal predecessors, (89), 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 93 [2022-03-20 18:42:04,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:42:04,440 INFO L225 Difference]: With dead ends: 104 [2022-03-20 18:42:04,440 INFO L226 Difference]: Without dead ends: 97 [2022-03-20 18:42:04,441 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 140 SyntacticMatches, 2 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 957 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=3993, Invalid=13299, Unknown=0, NotChecked=0, Total=17292 [2022-03-20 18:42:04,441 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 49 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 3297 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 3380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 3297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-20 18:42:04,441 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 59 Invalid, 3380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 3297 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-20 18:42:04,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-03-20 18:42:04,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2022-03-20 18:42:04,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 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 18:42:04,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2022-03-20 18:42:04,449 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 93 [2022-03-20 18:42:04,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:42:04,450 INFO L478 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2022-03-20 18:42:04,450 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.022727272727273) internal successors, (89), 43 states have internal predecessors, (89), 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 18:42:04,450 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2022-03-20 18:42:04,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-03-20 18:42:04,450 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:42:04,450 INFO L499 BasicCegarLoop]: trace histogram [42, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:42:04,481 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 18:42:04,666 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,SelfDestructingSolverStorable81,SelfDestructingSolverStorable82 [2022-03-20 18:42:04,667 INFO L403 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:42:04,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:42:04,667 INFO L85 PathProgramCache]: Analyzing trace with hash -1574295198, now seen corresponding path program 81 times [2022-03-20 18:42:04,667 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:42:04,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1599148809] [2022-03-20 18:42:04,775 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:42:04,776 INFO L85 PathProgramCache]: Analyzing trace with hash 1120143601, now seen corresponding path program 1 times [2022-03-20 18:42:04,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:42:04,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1733376746] [2022-03-20 18:42:04,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:42:04,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:42:04,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:42:04,780 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:42:04,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:42:04,784 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:42:04,784 INFO L85 PathProgramCache]: Analyzing trace with hash -1574295198, now seen corresponding path program 82 times [2022-03-20 18:42:04,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:42:04,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307041372] [2022-03-20 18:42:04,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:42:04,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:42:04,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:42:05,677 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:42:05,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:42:05,679 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 42 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:42:05,679 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:42:05,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307041372] [2022-03-20 18:42:05,680 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [307041372] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:42:05,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1195289938] [2022-03-20 18:42:05,680 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:42:05,680 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:42:05,680 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:42:05,681 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 18:42:05,682 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 18:42:05,765 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:42:05,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:42:05,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 86 conjunts are in the unsatisfiable core [2022-03-20 18:42:05,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:42:06,035 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 42 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:42:06,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:42:35,234 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 42 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:42:35,234 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1195289938] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:42:35,234 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:42:35,234 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 45] total 89 [2022-03-20 18:42:35,235 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:42:35,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1599148809] [2022-03-20 18:42:35,235 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1599148809] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:42:35,235 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:42:35,235 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-03-20 18:42:35,235 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049241727] [2022-03-20 18:42:35,235 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:42:35,235 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-03-20 18:42:35,235 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:42:35,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-03-20 18:42:35,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2067, Invalid=5765, Unknown=0, NotChecked=0, Total=7832 [2022-03-20 18:42:35,236 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 45 states, 45 states have (on average 2.022222222222222) internal successors, (91), 44 states have internal predecessors, (91), 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 18:42:37,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:42:37,376 INFO L93 Difference]: Finished difference Result 106 states and 110 transitions. [2022-03-20 18:42:37,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-03-20 18:42:37,376 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.022222222222222) internal successors, (91), 44 states have internal predecessors, (91), 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 95 [2022-03-20 18:42:37,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:42:37,377 INFO L225 Difference]: With dead ends: 106 [2022-03-20 18:42:37,377 INFO L226 Difference]: Without dead ends: 99 [2022-03-20 18:42:37,378 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 147 SyntacticMatches, 2 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 29.5s TimeCoverageRelationStatistics Valid=4123, Invalid=12907, Unknown=0, NotChecked=0, Total=17030 [2022-03-20 18:42:37,378 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 50 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 3442 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 3527 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 3442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:42:37,378 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 44 Invalid, 3527 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 3442 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-20 18:42:37,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-03-20 18:42:37,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2022-03-20 18:42:37,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 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 18:42:37,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2022-03-20 18:42:37,386 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 95 [2022-03-20 18:42:37,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:42:37,386 INFO L478 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2022-03-20 18:42:37,386 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.022222222222222) internal successors, (91), 44 states have internal predecessors, (91), 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 18:42:37,386 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2022-03-20 18:42:37,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-03-20 18:42:37,387 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:42:37,387 INFO L499 BasicCegarLoop]: trace histogram [43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:42:37,403 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 18:42:37,591 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83,SelfDestructingSolverStorable84,42 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:42:37,591 INFO L403 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:42:37,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:42:37,592 INFO L85 PathProgramCache]: Analyzing trace with hash 872739967, now seen corresponding path program 83 times [2022-03-20 18:42:37,592 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:42:37,592 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2062870460] [2022-03-20 18:42:37,744 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:42:37,745 INFO L85 PathProgramCache]: Analyzing trace with hash 1179248945, now seen corresponding path program 1 times [2022-03-20 18:42:37,745 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:42:37,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1828974002] [2022-03-20 18:42:37,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:42:37,745 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:42:37,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:42:37,750 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:42:37,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:42:37,753 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:42:37,753 INFO L85 PathProgramCache]: Analyzing trace with hash 872739967, now seen corresponding path program 84 times [2022-03-20 18:42:37,753 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:42:37,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820831789] [2022-03-20 18:42:37,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:42:37,753 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:42:37,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:42:38,663 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:42:38,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:42:38,672 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 43 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:42:38,673 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:42:38,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820831789] [2022-03-20 18:42:38,673 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1820831789] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:42:38,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [700182104] [2022-03-20 18:42:38,673 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:42:38,673 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:42:38,673 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:42:38,674 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 18:42:38,675 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 18:42:38,704 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:42:38,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:42:38,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 18:42:38,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:42:39,543 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 126 proven. 1 refuted. 0 times theorem prover too weak. 1722 trivial. 0 not checked. [2022-03-20 18:42:39,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:42:40,915 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 126 proven. 1 refuted. 0 times theorem prover too weak. 1722 trivial. 0 not checked. [2022-03-20 18:42:40,916 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [700182104] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:42:40,916 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:42:40,916 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 4, 7] total 53 [2022-03-20 18:42:40,916 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:42:40,916 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2062870460] [2022-03-20 18:42:40,916 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2062870460] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:42:40,916 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:42:40,916 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-03-20 18:42:40,916 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670167931] [2022-03-20 18:42:40,916 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:42:40,916 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-03-20 18:42:40,916 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:42:40,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-03-20 18:42:40,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=316, Invalid=2440, Unknown=0, NotChecked=0, Total=2756 [2022-03-20 18:42:40,917 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand has 46 states, 46 states have (on average 2.0217391304347827) internal successors, (93), 45 states have internal predecessors, (93), 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 18:42:43,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:42:43,768 INFO L93 Difference]: Finished difference Result 108 states and 112 transitions. [2022-03-20 18:42:43,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-03-20 18:42:43,768 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.0217391304347827) internal successors, (93), 45 states have internal predecessors, (93), 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 97 [2022-03-20 18:42:43,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:42:43,769 INFO L225 Difference]: With dead ends: 108 [2022-03-20 18:42:43,769 INFO L226 Difference]: Without dead ends: 101 [2022-03-20 18:42:43,770 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 189 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 917 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=738, Invalid=8382, Unknown=0, NotChecked=0, Total=9120 [2022-03-20 18:42:43,770 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 51 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 3621 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 3708 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 3621 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:42:43,770 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 54 Invalid, 3708 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 3621 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-20 18:42:43,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-03-20 18:42:43,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2022-03-20 18:42:43,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 96 states have (on average 1.03125) internal successors, (99), 96 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 18:42:43,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2022-03-20 18:42:43,778 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2022-03-20 18:42:43,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:42:43,778 INFO L478 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2022-03-20 18:42:43,778 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.0217391304347827) internal successors, (93), 45 states have internal predecessors, (93), 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 18:42:43,778 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2022-03-20 18:42:43,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-03-20 18:42:43,779 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:42:43,779 INFO L499 BasicCegarLoop]: trace histogram [44, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:42:43,795 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 18:42:43,982 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85,SelfDestructingSolverStorable86,43 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:42:43,982 INFO L403 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:42:43,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:42:43,983 INFO L85 PathProgramCache]: Analyzing trace with hash -1168544676, now seen corresponding path program 85 times [2022-03-20 18:42:43,983 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:42:43,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2027670526] [2022-03-20 18:42:44,096 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:42:44,096 INFO L85 PathProgramCache]: Analyzing trace with hash 1238354289, now seen corresponding path program 1 times [2022-03-20 18:42:44,096 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:42:44,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1054330224] [2022-03-20 18:42:44,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:42:44,096 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:42:44,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:42:44,099 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:42:44,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:42:44,102 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:42:44,102 INFO L85 PathProgramCache]: Analyzing trace with hash -1168544676, now seen corresponding path program 86 times [2022-03-20 18:42:44,102 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:42:44,102 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [781697087] [2022-03-20 18:42:44,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:42:44,102 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:42:44,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:42:45,008 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:42:45,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:42:45,014 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 44 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:42:45,014 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:42:45,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [781697087] [2022-03-20 18:42:45,014 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [781697087] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:42:45,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351628197] [2022-03-20 18:42:45,014 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:42:45,014 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:42:45,014 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:42:45,016 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 18:42:45,016 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 18:42:45,138 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:42:45,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:42:45,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 90 conjunts are in the unsatisfiable core [2022-03-20 18:42:45,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:42:45,429 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 44 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:42:45,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:43:37,608 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 44 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:43:37,608 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1351628197] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:43:37,608 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:43:37,609 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 47] total 93 [2022-03-20 18:43:37,609 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:43:37,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2027670526] [2022-03-20 18:43:37,609 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2027670526] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:43:37,609 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:43:37,609 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2022-03-20 18:43:37,609 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520476102] [2022-03-20 18:43:37,609 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:43:37,609 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-03-20 18:43:37,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:43:37,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-03-20 18:43:37,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2253, Invalid=6303, Unknown=0, NotChecked=0, Total=8556 [2022-03-20 18:43:37,610 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand has 47 states, 47 states have (on average 2.021276595744681) internal successors, (95), 46 states have internal predecessors, (95), 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 18:43:39,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:43:39,807 INFO L93 Difference]: Finished difference Result 110 states and 114 transitions. [2022-03-20 18:43:39,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-03-20 18:43:39,808 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.021276595744681) internal successors, (95), 46 states have internal predecessors, (95), 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 99 [2022-03-20 18:43:39,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:43:39,808 INFO L225 Difference]: With dead ends: 110 [2022-03-20 18:43:39,808 INFO L226 Difference]: Without dead ends: 103 [2022-03-20 18:43:39,809 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 153 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1083 ImplicationChecksByTransitivity, 51.2s TimeCoverageRelationStatistics Valid=4495, Invalid=14137, Unknown=0, NotChecked=0, Total=18632 [2022-03-20 18:43:39,809 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 52 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 3954 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 4043 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 3954 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-20 18:43:39,809 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 189 Invalid, 4043 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 3954 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-20 18:43:39,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-03-20 18:43:39,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2022-03-20 18:43:39,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.030612244897959) internal successors, (101), 98 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 18:43:39,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2022-03-20 18:43:39,817 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 99 [2022-03-20 18:43:39,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:43:39,817 INFO L478 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2022-03-20 18:43:39,818 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.021276595744681) internal successors, (95), 46 states have internal predecessors, (95), 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 18:43:39,818 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2022-03-20 18:43:39,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2022-03-20 18:43:39,818 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:43:39,818 INFO L499 BasicCegarLoop]: trace histogram [45, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:43:39,847 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-03-20 18:43:40,027 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,SelfDestructingSolverStorable87,SelfDestructingSolverStorable88 [2022-03-20 18:43:40,027 INFO L403 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:43:40,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:43:40,028 INFO L85 PathProgramCache]: Analyzing trace with hash -43032327, now seen corresponding path program 87 times [2022-03-20 18:43:40,028 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:43:40,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1737687394] [2022-03-20 18:43:40,140 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:43:40,141 INFO L85 PathProgramCache]: Analyzing trace with hash 1297459633, now seen corresponding path program 1 times [2022-03-20 18:43:40,141 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:43:40,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444157312] [2022-03-20 18:43:40,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:43:40,141 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:43:40,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:43:40,144 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:43:40,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:43:40,146 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:43:40,146 INFO L85 PathProgramCache]: Analyzing trace with hash -43032327, now seen corresponding path program 88 times [2022-03-20 18:43:40,146 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:43:40,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504206404] [2022-03-20 18:43:40,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:43:40,147 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:43:40,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:43:41,078 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:43:41,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:43:41,080 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 45 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:43:41,081 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:43:41,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504206404] [2022-03-20 18:43:41,081 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1504206404] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:43:41,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603502673] [2022-03-20 18:43:41,081 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:43:41,081 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:43:41,081 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:43:41,082 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 18:43:41,082 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 18:43:41,138 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:43:41,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:43:41,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 92 conjunts are in the unsatisfiable core [2022-03-20 18:43:41,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:43:41,479 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 45 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:43:41,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:07,739 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 45 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:07,739 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [603502673] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:07,739 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:07,740 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47, 48] total 95 [2022-03-20 18:45:07,740 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:07,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1737687394] [2022-03-20 18:45:07,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1737687394] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:07,740 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:07,740 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2022-03-20 18:45:07,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25845382] [2022-03-20 18:45:07,740 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:07,740 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-03-20 18:45:07,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:07,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-03-20 18:45:07,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2349, Invalid=6581, Unknown=0, NotChecked=0, Total=8930 [2022-03-20 18:45:07,741 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 48 states, 48 states have (on average 2.0208333333333335) internal successors, (97), 47 states have internal predecessors, (97), 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 18:45:10,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:10,245 INFO L93 Difference]: Finished difference Result 112 states and 116 transitions. [2022-03-20 18:45:10,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-03-20 18:45:10,245 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.0208333333333335) internal successors, (97), 47 states have internal predecessors, (97), 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 101 [2022-03-20 18:45:10,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:10,246 INFO L225 Difference]: With dead ends: 112 [2022-03-20 18:45:10,246 INFO L226 Difference]: Without dead ends: 105 [2022-03-20 18:45:10,247 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 156 SyntacticMatches, 2 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1130 ImplicationChecksByTransitivity, 85.3s TimeCoverageRelationStatistics Valid=4687, Invalid=14773, Unknown=0, NotChecked=0, Total=19460 [2022-03-20 18:45:10,247 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 53 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 4129 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 4220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 4129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:10,247 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 189 Invalid, 4220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 4129 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-03-20 18:45:10,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-03-20 18:45:10,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2022-03-20 18:45:10,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 100 states have (on average 1.03) internal successors, (103), 100 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 18:45:10,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2022-03-20 18:45:10,256 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 101 [2022-03-20 18:45:10,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:10,256 INFO L478 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2022-03-20 18:45:10,256 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.0208333333333335) internal successors, (97), 47 states have internal predecessors, (97), 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 18:45:10,256 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2022-03-20 18:45:10,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-03-20 18:45:10,257 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:10,257 INFO L499 BasicCegarLoop]: trace histogram [46, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:10,277 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 18:45:10,457 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,45 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable89 [2022-03-20 18:45:10,457 INFO L403 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:10,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:10,458 INFO L85 PathProgramCache]: Analyzing trace with hash -757423530, now seen corresponding path program 89 times [2022-03-20 18:45:10,458 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:10,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1201174043] [2022-03-20 18:45:10,596 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:45:10,596 INFO L85 PathProgramCache]: Analyzing trace with hash 1356564977, now seen corresponding path program 1 times [2022-03-20 18:45:10,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:10,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500802066] [2022-03-20 18:45:10,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:10,597 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:10,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:45:10,600 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:45:10,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:45:10,602 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:45:10,602 INFO L85 PathProgramCache]: Analyzing trace with hash -757423530, now seen corresponding path program 90 times [2022-03-20 18:45:10,602 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:10,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [324977558] [2022-03-20 18:45:10,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:10,602 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:10,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:11,611 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:11,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:11,614 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 46 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:11,614 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:11,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [324977558] [2022-03-20 18:45:11,615 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [324977558] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:11,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1800224988] [2022-03-20 18:45:11,615 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:45:11,615 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:11,615 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:11,616 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 18:45:11,616 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 18:45:11,672 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:45:11,672 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:45:11,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 18:45:11,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:15,776 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 135 proven. 1 refuted. 0 times theorem prover too weak. 1980 trivial. 0 not checked. [2022-03-20 18:45:15,777 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:45:18,384 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 135 proven. 1 refuted. 0 times theorem prover too weak. 1980 trivial. 0 not checked. [2022-03-20 18:45:18,384 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1800224988] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:45:18,384 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:45:18,384 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 4, 7] total 56 [2022-03-20 18:45:18,384 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:45:18,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1201174043] [2022-03-20 18:45:18,384 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1201174043] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:45:18,384 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:45:18,385 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2022-03-20 18:45:18,385 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247423201] [2022-03-20 18:45:18,385 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:45:18,385 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-03-20 18:45:18,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:18,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-03-20 18:45:18,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=2743, Unknown=0, NotChecked=0, Total=3080 [2022-03-20 18:45:18,386 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 49 states, 49 states have (on average 2.020408163265306) internal successors, (99), 48 states have internal predecessors, (99), 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 18:45:21,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:45:21,879 INFO L93 Difference]: Finished difference Result 114 states and 118 transitions. [2022-03-20 18:45:21,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-03-20 18:45:21,879 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.020408163265306) internal successors, (99), 48 states have internal predecessors, (99), 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 103 [2022-03-20 18:45:21,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:45:21,879 INFO L225 Difference]: With dead ends: 114 [2022-03-20 18:45:21,879 INFO L226 Difference]: Without dead ends: 107 [2022-03-20 18:45:21,881 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 201 SyntacticMatches, 1 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1049 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=789, Invalid=9513, Unknown=0, NotChecked=0, Total=10302 [2022-03-20 18:45:21,881 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 54 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 4116 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 4209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 4116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-20 18:45:21,881 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 29 Invalid, 4209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 4116 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-03-20 18:45:21,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-03-20 18:45:21,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2022-03-20 18:45:21,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.0294117647058822) internal successors, (105), 102 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 18:45:21,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2022-03-20 18:45:21,890 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 103 [2022-03-20 18:45:21,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:45:21,890 INFO L478 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2022-03-20 18:45:21,891 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.020408163265306) internal successors, (99), 48 states have internal predecessors, (99), 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 18:45:21,891 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2022-03-20 18:45:21,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-03-20 18:45:21,891 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:45:21,891 INFO L499 BasicCegarLoop]: trace histogram [47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:45:21,897 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-03-20 18:45:22,095 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,SelfDestructingSolverStorable92,46 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:22,096 INFO L403 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:45:22,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:45:22,096 INFO L85 PathProgramCache]: Analyzing trace with hash -92602253, now seen corresponding path program 91 times [2022-03-20 18:45:22,096 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:45:22,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1394644864] [2022-03-20 18:45:22,241 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:45:22,242 INFO L85 PathProgramCache]: Analyzing trace with hash 1415670321, now seen corresponding path program 1 times [2022-03-20 18:45:22,242 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:22,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1204463515] [2022-03-20 18:45:22,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:22,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:22,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:45:22,245 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:45:22,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:45:22,250 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:45:22,250 INFO L85 PathProgramCache]: Analyzing trace with hash -92602253, now seen corresponding path program 92 times [2022-03-20 18:45:22,250 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:45:22,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416589663] [2022-03-20 18:45:22,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:45:22,250 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:45:22,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:23,290 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:45:23,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:45:23,293 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 47 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:45:23,293 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:45:23,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416589663] [2022-03-20 18:45:23,293 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [416589663] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:45:23,293 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1064518644] [2022-03-20 18:45:23,293 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:45:23,293 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:45:23,293 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:45:23,294 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 18:45:23,295 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 18:45:23,356 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:45:23,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:45:23,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 100 conjunts are in the unsatisfiable core [2022-03-20 18:45:23,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:45:23,704 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 18:45:23,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:46:16,415 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 18:46:16,416 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1064518644] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:46:16,416 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:46:16,416 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 53] total 103 [2022-03-20 18:46:16,416 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:46:16,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1394644864] [2022-03-20 18:46:16,416 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1394644864] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:46:16,416 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:46:16,416 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2022-03-20 18:46:16,417 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453379358] [2022-03-20 18:46:16,417 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:46:16,417 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-03-20 18:46:16,417 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:16,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-03-20 18:46:16,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2603, Invalid=7903, Unknown=0, NotChecked=0, Total=10506 [2022-03-20 18:46:16,418 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 50 states, 50 states have (on average 2.02) internal successors, (101), 49 states have internal predecessors, (101), 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 18:46:20,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:46:20,075 INFO L93 Difference]: Finished difference Result 116 states and 120 transitions. [2022-03-20 18:46:20,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-03-20 18:46:20,075 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.02) internal successors, (101), 49 states have internal predecessors, (101), 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 105 [2022-03-20 18:46:20,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:46:20,076 INFO L225 Difference]: With dead ends: 116 [2022-03-20 18:46:20,076 INFO L226 Difference]: Without dead ends: 109 [2022-03-20 18:46:20,077 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 158 SyntacticMatches, 2 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1236 ImplicationChecksByTransitivity, 53.3s TimeCoverageRelationStatistics Valid=5139, Invalid=17211, Unknown=0, NotChecked=0, Total=22350 [2022-03-20 18:46:20,077 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 55 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 4305 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 4400 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 4305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-03-20 18:46:20,077 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 34 Invalid, 4400 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 4305 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-03-20 18:46:20,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-03-20 18:46:20,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2022-03-20 18:46:20,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 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 18:46:20,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2022-03-20 18:46:20,086 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 105 [2022-03-20 18:46:20,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:46:20,086 INFO L478 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2022-03-20 18:46:20,086 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.02) internal successors, (101), 49 states have internal predecessors, (101), 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 18:46:20,086 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2022-03-20 18:46:20,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-03-20 18:46:20,087 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:46:20,087 INFO L499 BasicCegarLoop]: trace histogram [48, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:46:20,103 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2022-03-20 18:46:20,294 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93,SelfDestructingSolverStorable94,47 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:20,294 INFO L403 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:46:20,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:46:20,295 INFO L85 PathProgramCache]: Analyzing trace with hash -1149482160, now seen corresponding path program 93 times [2022-03-20 18:46:20,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:46:20,295 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1725981029] [2022-03-20 18:46:20,408 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:46:20,408 INFO L85 PathProgramCache]: Analyzing trace with hash 1474775665, now seen corresponding path program 1 times [2022-03-20 18:46:20,408 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:20,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836939798] [2022-03-20 18:46:20,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:20,409 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:20,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:46:20,411 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:46:20,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:46:20,413 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:46:20,414 INFO L85 PathProgramCache]: Analyzing trace with hash -1149482160, now seen corresponding path program 94 times [2022-03-20 18:46:20,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:46:20,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [432648401] [2022-03-20 18:46:20,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:46:20,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:46:20,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:21,521 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:46:21,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:46:21,524 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 48 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:46:21,524 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:46:21,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [432648401] [2022-03-20 18:46:21,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [432648401] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:46:21,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1868601036] [2022-03-20 18:46:21,524 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:46:21,525 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:46:21,525 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:46:21,526 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 18:46:21,526 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 18:46:21,638 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:46:21,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:46:21,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 99 conjunts are in the unsatisfiable core [2022-03-20 18:46:21,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:46:22,035 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 18:46:22,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:49:14,291 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 18:49:14,291 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1868601036] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:49:14,291 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:49:14,291 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 102 [2022-03-20 18:49:14,291 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:49:14,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1725981029] [2022-03-20 18:49:14,291 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1725981029] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:49:14,291 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:49:14,292 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2022-03-20 18:49:14,292 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461703651] [2022-03-20 18:49:14,292 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:49:14,292 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-03-20 18:49:14,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:49:14,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-03-20 18:49:14,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2699, Invalid=7603, Unknown=0, NotChecked=0, Total=10302 [2022-03-20 18:49:14,293 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 51 states, 51 states have (on average 2.019607843137255) internal successors, (103), 50 states have internal predecessors, (103), 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 18:49:17,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:49:17,042 INFO L93 Difference]: Finished difference Result 118 states and 122 transitions. [2022-03-20 18:49:17,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-03-20 18:49:17,043 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.019607843137255) internal successors, (103), 50 states have internal predecessors, (103), 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 107 [2022-03-20 18:49:17,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:49:17,043 INFO L225 Difference]: With dead ends: 118 [2022-03-20 18:49:17,043 INFO L226 Difference]: Without dead ends: 111 [2022-03-20 18:49:17,045 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 164 SyntacticMatches, 2 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1232 ImplicationChecksByTransitivity, 170.0s TimeCoverageRelationStatistics Valid=5337, Invalid=17013, Unknown=0, NotChecked=0, Total=22350 [2022-03-20 18:49:17,045 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 56 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 4624 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 4721 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 4624 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:49:17,045 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 144 Invalid, 4721 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 4624 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-03-20 18:49:17,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-03-20 18:49:17,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2022-03-20 18:49:17,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 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 18:49:17,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2022-03-20 18:49:17,054 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 107 [2022-03-20 18:49:17,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:49:17,054 INFO L478 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2022-03-20 18:49:17,054 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.019607843137255) internal successors, (103), 50 states have internal predecessors, (103), 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 18:49:17,054 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2022-03-20 18:49:17,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2022-03-20 18:49:17,055 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:49:17,055 INFO L499 BasicCegarLoop]: trace histogram [49, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:49:17,076 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 18:49:17,271 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95,SelfDestructingSolverStorable96,48 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:49:17,271 INFO L403 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:49:17,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:49:17,272 INFO L85 PathProgramCache]: Analyzing trace with hash 1096176365, now seen corresponding path program 95 times [2022-03-20 18:49:17,272 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:49:17,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1206759884] [2022-03-20 18:49:17,385 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:49:17,385 INFO L85 PathProgramCache]: Analyzing trace with hash 1533881009, now seen corresponding path program 1 times [2022-03-20 18:49:17,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:49:17,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1790529508] [2022-03-20 18:49:17,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:49:17,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:49:17,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:49:17,389 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:49:17,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:49:17,391 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:49:17,391 INFO L85 PathProgramCache]: Analyzing trace with hash 1096176365, now seen corresponding path program 96 times [2022-03-20 18:49:17,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:49:17,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1545467078] [2022-03-20 18:49:17,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:49:17,391 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:49:17,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:18,486 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:49:18,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:18,504 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 49 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:49:18,504 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:49:18,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1545467078] [2022-03-20 18:49:18,504 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1545467078] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:49:18,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [145891133] [2022-03-20 18:49:18,504 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 18:49:18,505 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:49:18,505 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:49:18,506 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 18:49:18,506 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 18:49:18,555 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-20 18:49:18,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:49:18,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 18:49:18,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:49:23,979 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 144 proven. 1 refuted. 0 times theorem prover too weak. 2256 trivial. 0 not checked. [2022-03-20 18:49:23,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:49:27,482 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 144 proven. 1 refuted. 0 times theorem prover too weak. 2256 trivial. 0 not checked. [2022-03-20 18:49:27,483 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [145891133] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:49:27,483 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:49:27,483 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 4, 7] total 59 [2022-03-20 18:49:27,483 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:49:27,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1206759884] [2022-03-20 18:49:27,483 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1206759884] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:49:27,483 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:49:27,483 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2022-03-20 18:49:27,483 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738031098] [2022-03-20 18:49:27,483 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:49:27,483 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-03-20 18:49:27,483 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:49:27,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-03-20 18:49:27,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=3064, Unknown=0, NotChecked=0, Total=3422 [2022-03-20 18:49:27,484 INFO L87 Difference]: Start difference. First operand 111 states and 113 transitions. Second operand has 52 states, 52 states have (on average 2.019230769230769) internal successors, (105), 51 states have internal predecessors, (105), 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 18:49:31,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:49:31,617 INFO L93 Difference]: Finished difference Result 120 states and 124 transitions. [2022-03-20 18:49:31,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-03-20 18:49:31,617 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.019230769230769) internal successors, (105), 51 states have internal predecessors, (105), 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 109 [2022-03-20 18:49:31,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:49:31,618 INFO L225 Difference]: With dead ends: 120 [2022-03-20 18:49:31,618 INFO L226 Difference]: Without dead ends: 113 [2022-03-20 18:49:31,618 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 213 SyntacticMatches, 1 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1190 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=840, Invalid=10716, Unknown=0, NotChecked=0, Total=11556 [2022-03-20 18:49:31,619 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 57 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 4941 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 249 SdHoareTripleChecker+Invalid, 5040 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 4941 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-03-20 18:49:31,619 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 249 Invalid, 5040 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 4941 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-03-20 18:49:31,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-03-20 18:49:31,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2022-03-20 18:49:31,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 108 states have (on average 1.0277777777777777) internal successors, (111), 108 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 18:49:31,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2022-03-20 18:49:31,628 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 109 [2022-03-20 18:49:31,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:49:31,628 INFO L478 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2022-03-20 18:49:31,628 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.019230769230769) internal successors, (105), 51 states have internal predecessors, (105), 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 18:49:31,628 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2022-03-20 18:49:31,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-03-20 18:49:31,628 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:49:31,628 INFO L499 BasicCegarLoop]: trace histogram [50, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:49:31,632 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 18:49:31,832 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable97,49 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable98 [2022-03-20 18:49:31,833 INFO L403 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:49:31,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:49:31,833 INFO L85 PathProgramCache]: Analyzing trace with hash -1194530998, now seen corresponding path program 97 times [2022-03-20 18:49:31,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:49:31,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1145917591] [2022-03-20 18:49:31,944 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:49:31,944 INFO L85 PathProgramCache]: Analyzing trace with hash 1592986353, now seen corresponding path program 1 times [2022-03-20 18:49:31,944 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:49:31,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [474029703] [2022-03-20 18:49:31,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:49:31,944 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:49:31,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:49:31,947 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:49:31,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:49:31,949 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:49:31,949 INFO L85 PathProgramCache]: Analyzing trace with hash -1194530998, now seen corresponding path program 98 times [2022-03-20 18:49:31,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:49:31,950 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178829096] [2022-03-20 18:49:31,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:49:31,950 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:49:31,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:33,119 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:49:33,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:49:33,121 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 50 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:49:33,121 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:49:33,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178829096] [2022-03-20 18:49:33,121 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1178829096] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:49:33,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1830560921] [2022-03-20 18:49:33,122 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 18:49:33,122 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:49:33,122 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:49:33,123 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 18:49:33,124 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 18:49:33,219 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 18:49:33,219 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:49:33,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 106 conjunts are in the unsatisfiable core [2022-03-20 18:49:33,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:49:33,572 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 18:49:33,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 18:50:45,818 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 18:50:45,819 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1830560921] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 18:50:45,819 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 18:50:45,819 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 56] total 109 [2022-03-20 18:50:45,819 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 18:50:45,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1145917591] [2022-03-20 18:50:45,819 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1145917591] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 18:50:45,819 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 18:50:45,819 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2022-03-20 18:50:45,819 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1820520507] [2022-03-20 18:50:45,819 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 18:50:45,819 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-03-20 18:50:45,820 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:45,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-03-20 18:50:45,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2918, Invalid=8854, Unknown=0, NotChecked=0, Total=11772 [2022-03-20 18:50:45,821 INFO L87 Difference]: Start difference. First operand 113 states and 115 transitions. Second operand has 53 states, 53 states have (on average 2.018867924528302) internal successors, (107), 52 states have internal predecessors, (107), 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 18:50:49,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 18:50:49,859 INFO L93 Difference]: Finished difference Result 122 states and 126 transitions. [2022-03-20 18:50:49,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-03-20 18:50:49,859 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.018867924528302) internal successors, (107), 52 states have internal predecessors, (107), 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 111 [2022-03-20 18:50:49,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 18:50:49,860 INFO L225 Difference]: With dead ends: 122 [2022-03-20 18:50:49,860 INFO L226 Difference]: Without dead ends: 115 [2022-03-20 18:50:49,862 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 167 SyntacticMatches, 2 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1389 ImplicationChecksByTransitivity, 72.7s TimeCoverageRelationStatistics Valid=5766, Invalid=19356, Unknown=0, NotChecked=0, Total=25122 [2022-03-20 18:50:49,862 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 58 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 4896 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 4997 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 4896 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-03-20 18:50:49,862 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 49 Invalid, 4997 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 4896 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-03-20 18:50:49,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-03-20 18:50:49,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2022-03-20 18:50:49,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0272727272727273) internal successors, (113), 110 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 18:50:49,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2022-03-20 18:50:49,871 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 111 [2022-03-20 18:50:49,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 18:50:49,871 INFO L478 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2022-03-20 18:50:49,871 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.018867924528302) internal successors, (107), 52 states have internal predecessors, (107), 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 18:50:49,871 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2022-03-20 18:50:49,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2022-03-20 18:50:49,872 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 18:50:49,872 INFO L499 BasicCegarLoop]: trace histogram [51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 18:50:49,899 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 18:50:50,087 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable99,SelfDestructingSolverStorable100 [2022-03-20 18:50:50,087 INFO L403 AbstractCegarLoop]: === Iteration 53 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 18:50:50,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 18:50:50,088 INFO L85 PathProgramCache]: Analyzing trace with hash 753916007, now seen corresponding path program 99 times [2022-03-20 18:50:50,088 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 18:50:50,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [924482737] [2022-03-20 18:50:50,199 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-20 18:50:50,200 INFO L85 PathProgramCache]: Analyzing trace with hash 1652091697, now seen corresponding path program 1 times [2022-03-20 18:50:50,200 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:50:50,200 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603268617] [2022-03-20 18:50:50,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:50,200 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:50:50,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:50:50,203 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 18:50:50,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 18:50:50,205 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 18:50:50,205 INFO L85 PathProgramCache]: Analyzing trace with hash 753916007, now seen corresponding path program 100 times [2022-03-20 18:50:50,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 18:50:50,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734913783] [2022-03-20 18:50:50,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 18:50:50,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 18:50:50,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:51,426 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 18:50:51,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 18:50:51,432 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 51 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 18:50:51,432 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 18:50:51,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734913783] [2022-03-20 18:50:51,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [734913783] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 18:50:51,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1735996857] [2022-03-20 18:50:51,432 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 18:50:51,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 18:50:51,433 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 18:50:51,434 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 18:50:51,435 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 18:50:51,565 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 18:50:51,565 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 18:50:51,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 105 conjunts are in the unsatisfiable core [2022-03-20 18:50:51,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 18:50:51,964 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 18:50:51,965 INFO L328 TraceCheckSpWp]: Computing backward predicates...