/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_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-7968f31 [2022-03-18 00:45:11,059 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-18 00:45:11,060 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-18 00:45:11,080 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-18 00:45:11,122 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-18 00:45:11,132 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-18 00:45:11,132 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-18 00:45:11,134 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-18 00:45:11,134 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-18 00:45:11,134 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-18 00:45:11,134 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-18 00:45:11,134 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-18 00:45:11,134 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-18 00:45:11,134 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-18 00:45:11,135 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-18 00:45:11,135 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-18 00:45:11,135 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-18 00:45:11,135 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-18 00:45:11,135 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-18 00:45:11,136 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-18 00:45:11,136 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 00:45:11,136 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-18 00:45:11,136 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-18 00:45:11,136 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-18 00:45:11,136 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-18 00:45:11,136 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-18 00:45:11,136 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-18 00:45:11,136 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-18 00:45:11,325 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-18 00:45:11,343 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-18 00:45:11,344 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-18 00:45:11,345 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-18 00:45:11,346 INFO L275 PluginConnector]: CDTParser initialized [2022-03-18 00:45:11,346 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono1_1-1.c [2022-03-18 00:45:11,402 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/305aa4cf1/261287cb7f5c4cec9a1069f810bc0f59/FLAG07423db9b [2022-03-18 00:45:11,720 INFO L306 CDTParser]: Found 1 translation units. [2022-03-18 00:45:11,720 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono1_1-1.c [2022-03-18 00:45:11,724 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/305aa4cf1/261287cb7f5c4cec9a1069f810bc0f59/FLAG07423db9b [2022-03-18 00:45:12,149 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/305aa4cf1/261287cb7f5c4cec9a1069f810bc0f59 [2022-03-18 00:45:12,150 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-18 00:45:12,151 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-18 00:45:12,152 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-18 00:45:12,153 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-18 00:45:12,155 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-18 00:45:12,155 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 12:45:12" (1/1) ... [2022-03-18 00:45:12,156 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@40962ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:45:12, skipping insertion in model container [2022-03-18 00:45:12,156 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 12:45:12" (1/1) ... [2022-03-18 00:45:12,179 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-18 00:45:12,187 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-18 00:45:12,337 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_1-1.c[313,326] [2022-03-18 00:45:12,347 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 00:45:12,354 INFO L203 MainTranslator]: Completed pre-run [2022-03-18 00:45:12,362 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_1-1.c[313,326] [2022-03-18 00:45:12,364 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 00:45:12,373 INFO L208 MainTranslator]: Completed translation [2022-03-18 00:45:12,374 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:45:12 WrapperNode [2022-03-18 00:45:12,374 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-18 00:45:12,374 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-18 00:45:12,374 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-18 00:45:12,375 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-18 00:45:12,382 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:45:12" (1/1) ... [2022-03-18 00:45:12,382 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:45:12" (1/1) ... [2022-03-18 00:45:12,386 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:45:12" (1/1) ... [2022-03-18 00:45:12,386 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:45:12" (1/1) ... [2022-03-18 00:45:12,389 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:45:12" (1/1) ... [2022-03-18 00:45:12,391 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:45:12" (1/1) ... [2022-03-18 00:45:12,392 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:45:12" (1/1) ... [2022-03-18 00:45:12,393 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-18 00:45:12,394 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-18 00:45:12,394 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-18 00:45:12,394 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-18 00:45:12,395 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:45:12" (1/1) ... [2022-03-18 00:45:12,401 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 00:45:12,420 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:12,433 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) [2022-03-18 00:45:12,435 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 [2022-03-18 00:45:12,458 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-18 00:45:12,458 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-18 00:45:12,458 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-18 00:45:12,458 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-18 00:45:12,458 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-18 00:45:12,459 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-18 00:45:12,459 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-18 00:45:12,459 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-18 00:45:12,459 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-18 00:45:12,459 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-18 00:45:12,459 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-18 00:45:12,459 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-18 00:45:12,459 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-18 00:45:12,459 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-18 00:45:12,459 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-18 00:45:12,461 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-18 00:45:12,461 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-18 00:45:12,503 INFO L234 CfgBuilder]: Building ICFG [2022-03-18 00:45:12,505 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-18 00:45:12,612 INFO L275 CfgBuilder]: Performing block encoding [2022-03-18 00:45:12,630 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-18 00:45:12,631 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-18 00:45:12,632 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 12:45:12 BoogieIcfgContainer [2022-03-18 00:45:12,632 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-18 00:45:12,633 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-18 00:45:12,633 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-18 00:45:12,637 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-18 00:45:12,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.03 12:45:12" (1/3) ... [2022-03-18 00:45:12,638 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d18b8fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 12:45:12, skipping insertion in model container [2022-03-18 00:45:12,638 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:45:12" (2/3) ... [2022-03-18 00:45:12,638 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d18b8fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 12:45:12, skipping insertion in model container [2022-03-18 00:45:12,638 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 12:45:12" (3/3) ... [2022-03-18 00:45:12,639 INFO L111 eAbstractionObserver]: Analyzing ICFG Mono1_1-1.c [2022-03-18 00:45:12,642 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-18 00:45:12,642 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-18 00:45:12,676 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-18 00:45:12,682 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 [2022-03-18 00:45:12,682 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-18 00:45:12,691 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) [2022-03-18 00:45:12,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-03-18 00:45:12,697 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:12,697 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:12,698 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:12,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:12,702 INFO L85 PathProgramCache]: Analyzing trace with hash 491760044, now seen corresponding path program 1 times [2022-03-18 00:45:12,707 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:12,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1878899979] [2022-03-18 00:45:12,720 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 00:45:12,720 INFO L85 PathProgramCache]: Analyzing trace with hash 491760044, now seen corresponding path program 2 times [2022-03-18 00:45:12,722 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:12,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1226350679] [2022-03-18 00:45:12,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:12,723 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:12,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:12,819 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:12,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:12,827 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:12,828 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:12,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1226350679] [2022-03-18 00:45:12,828 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1226350679] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:12,828 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:12,828 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 00:45:12,830 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:12,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1878899979] [2022-03-18 00:45:12,830 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1878899979] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:12,831 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:12,831 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 00:45:12,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19425719] [2022-03-18 00:45:12,831 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:12,834 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-18 00:45:12,834 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:12,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-18 00:45:12,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 00:45:12,863 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) [2022-03-18 00:45:12,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:12,887 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2022-03-18 00:45:12,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-18 00:45:12,889 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 [2022-03-18 00:45:12,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:12,893 INFO L225 Difference]: With dead ends: 30 [2022-03-18 00:45:12,893 INFO L226 Difference]: Without dead ends: 13 [2022-03-18 00:45:12,895 INFO L911 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 [2022-03-18 00:45:12,897 INFO L912 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 [2022-03-18 00:45:12,898 INFO L913 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] [2022-03-18 00:45:12,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-03-18 00:45:12,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-03-18 00:45:12,917 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) [2022-03-18 00:45:12,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2022-03-18 00:45:12,918 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2022-03-18 00:45:12,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:12,918 INFO L478 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2022-03-18 00:45:12,919 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) [2022-03-18 00:45:12,919 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2022-03-18 00:45:12,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-03-18 00:45:12,919 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:12,919 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:12,919 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-18 00:45:12,919 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:12,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:12,920 INFO L85 PathProgramCache]: Analyzing trace with hash 482524834, now seen corresponding path program 1 times [2022-03-18 00:45:12,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:12,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1513853721] [2022-03-18 00:45:12,921 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 00:45:12,921 INFO L85 PathProgramCache]: Analyzing trace with hash 482524834, now seen corresponding path program 2 times [2022-03-18 00:45:12,921 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:12,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1023317181] [2022-03-18 00:45:12,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:12,922 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:12,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:12,982 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:12,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:13,005 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:13,006 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:13,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1023317181] [2022-03-18 00:45:13,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1023317181] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:13,006 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:13,007 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-18 00:45:13,007 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:13,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1513853721] [2022-03-18 00:45:13,007 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1513853721] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:13,007 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:13,007 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-18 00:45:13,008 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839599892] [2022-03-18 00:45:13,008 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:13,008 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-18 00:45:13,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:13,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-18 00:45:13,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-18 00:45:13,009 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) [2022-03-18 00:45:13,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:13,056 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2022-03-18 00:45:13,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-18 00:45:13,057 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 [2022-03-18 00:45:13,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:13,057 INFO L225 Difference]: With dead ends: 22 [2022-03-18 00:45:13,058 INFO L226 Difference]: Without dead ends: 15 [2022-03-18 00:45:13,058 INFO L911 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 [2022-03-18 00:45:13,059 INFO L912 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 [2022-03-18 00:45:13,060 INFO L913 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] [2022-03-18 00:45:13,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-03-18 00:45:13,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-03-18 00:45:13,064 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) [2022-03-18 00:45:13,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-03-18 00:45:13,064 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2022-03-18 00:45:13,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:13,065 INFO L478 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-03-18 00:45:13,065 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) [2022-03-18 00:45:13,065 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-03-18 00:45:13,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-03-18 00:45:13,065 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:13,066 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:13,066 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-18 00:45:13,066 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:13,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:13,067 INFO L85 PathProgramCache]: Analyzing trace with hash 925229631, now seen corresponding path program 1 times [2022-03-18 00:45:13,067 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:13,067 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1038566684] [2022-03-18 00:45:13,167 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 00:45:13,168 INFO L85 PathProgramCache]: Analyzing trace with hash -1303175503, now seen corresponding path program 1 times [2022-03-18 00:45:13,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:13,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886869706] [2022-03-18 00:45:13,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:13,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:13,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:13,288 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:13,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:13,295 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:13,295 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:13,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886869706] [2022-03-18 00:45:13,296 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1886869706] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:13,296 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:13,296 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 00:45:13,367 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:13,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1038566684] [2022-03-18 00:45:13,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1038566684] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:13,368 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:13,368 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 00:45:13,368 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847208767] [2022-03-18 00:45:13,368 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:13,369 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 00:45:13,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:13,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 00:45:13,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-03-18 00:45:13,370 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) [2022-03-18 00:45:13,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:13,436 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2022-03-18 00:45:13,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 00:45:13,437 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 [2022-03-18 00:45:13,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:13,437 INFO L225 Difference]: With dead ends: 22 [2022-03-18 00:45:13,437 INFO L226 Difference]: Without dead ends: 17 [2022-03-18 00:45:13,438 INFO L911 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 [2022-03-18 00:45:13,439 INFO L912 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 [2022-03-18 00:45:13,439 INFO L913 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] [2022-03-18 00:45:13,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-03-18 00:45:13,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-03-18 00:45:13,443 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) [2022-03-18 00:45:13,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-03-18 00:45:13,444 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2022-03-18 00:45:13,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:13,444 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-03-18 00:45:13,444 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) [2022-03-18 00:45:13,444 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-03-18 00:45:13,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-18 00:45:13,445 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:13,445 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:13,445 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-18 00:45:13,445 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:13,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:13,446 INFO L85 PathProgramCache]: Analyzing trace with hash 1220035546, now seen corresponding path program 1 times [2022-03-18 00:45:13,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:13,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [114209458] [2022-03-18 00:45:13,680 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:13,681 INFO L85 PathProgramCache]: Analyzing trace with hash -1244070159, now seen corresponding path program 1 times [2022-03-18 00:45:13,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:13,681 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1776505786] [2022-03-18 00:45:13,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:13,682 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:13,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:13,698 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:13,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:13,725 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:13,725 INFO L85 PathProgramCache]: Analyzing trace with hash 1220035546, now seen corresponding path program 2 times [2022-03-18 00:45:13,725 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:13,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1159452034] [2022-03-18 00:45:13,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:13,726 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:13,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:13,772 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:13,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:13,778 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:13,778 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:13,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1159452034] [2022-03-18 00:45:13,778 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1159452034] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:13,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [73037017] [2022-03-18 00:45:13,778 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:45:13,778 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:13,779 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:13,780 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) [2022-03-18 00:45:13,799 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-18 00:45:13,834 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:45:13,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:13,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-18 00:45:13,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:13,903 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:13,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:14,059 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:14,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [73037017] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:14,060 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:14,060 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 8] total 13 [2022-03-18 00:45:14,061 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:14,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [114209458] [2022-03-18 00:45:14,062 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [114209458] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:14,062 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:14,062 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 00:45:14,062 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573026884] [2022-03-18 00:45:14,062 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:14,062 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 00:45:14,062 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:14,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 00:45:14,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-03-18 00:45:14,065 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) [2022-03-18 00:45:14,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:14,124 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2022-03-18 00:45:14,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 00:45:14,124 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 [2022-03-18 00:45:14,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:14,127 INFO L225 Difference]: With dead ends: 26 [2022-03-18 00:45:14,127 INFO L226 Difference]: Without dead ends: 19 [2022-03-18 00:45:14,129 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2022-03-18 00:45:14,134 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 10 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s 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, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:14,135 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 24 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 00:45:14,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-03-18 00:45:14,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-03-18 00:45:14,144 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) [2022-03-18 00:45:14,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-03-18 00:45:14,145 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2022-03-18 00:45:14,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:14,145 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-03-18 00:45:14,146 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) [2022-03-18 00:45:14,146 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-03-18 00:45:14,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-18 00:45:14,147 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:14,147 INFO L500 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:14,182 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-03-18 00:45:14,380 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 [2022-03-18 00:45:14,380 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:14,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:14,382 INFO L85 PathProgramCache]: Analyzing trace with hash 1870024951, now seen corresponding path program 3 times [2022-03-18 00:45:14,382 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:14,382 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [546462882] [2022-03-18 00:45:14,547 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:14,548 INFO L85 PathProgramCache]: Analyzing trace with hash -1184964815, now seen corresponding path program 1 times [2022-03-18 00:45:14,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:14,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2021258747] [2022-03-18 00:45:14,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:14,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:14,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:14,584 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:14,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:14,623 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:14,623 INFO L85 PathProgramCache]: Analyzing trace with hash 1870024951, now seen corresponding path program 4 times [2022-03-18 00:45:14,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:14,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1014458944] [2022-03-18 00:45:14,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:14,624 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:14,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:14,703 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:14,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:14,717 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:14,717 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:14,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1014458944] [2022-03-18 00:45:14,717 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1014458944] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:14,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284279819] [2022-03-18 00:45:14,718 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:45:14,718 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:14,718 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:14,728 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) [2022-03-18 00:45:14,729 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-18 00:45:14,756 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:45:14,756 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:14,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-18 00:45:14,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:14,810 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:14,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:14,884 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:14,885 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1284279819] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:14,886 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:14,886 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 11 [2022-03-18 00:45:14,886 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:14,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [546462882] [2022-03-18 00:45:14,886 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [546462882] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:14,886 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:14,886 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 00:45:14,886 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613983366] [2022-03-18 00:45:14,887 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:14,887 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 00:45:14,887 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:14,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 00:45:14,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2022-03-18 00:45:14,888 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) [2022-03-18 00:45:14,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:14,930 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2022-03-18 00:45:14,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 00:45:14,930 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 [2022-03-18 00:45:14,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:14,931 INFO L225 Difference]: With dead ends: 28 [2022-03-18 00:45:14,931 INFO L226 Difference]: Without dead ends: 21 [2022-03-18 00:45:14,931 INFO L911 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 [2022-03-18 00:45:14,933 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 11 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:14,933 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 19 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 00:45:14,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-03-18 00:45:14,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-03-18 00:45:14,939 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) [2022-03-18 00:45:14,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2022-03-18 00:45:14,941 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 17 [2022-03-18 00:45:14,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:14,941 INFO L478 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2022-03-18 00:45:14,941 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) [2022-03-18 00:45:14,941 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2022-03-18 00:45:14,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-18 00:45:14,942 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:14,942 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:14,974 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-18 00:45:15,159 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 [2022-03-18 00:45:15,159 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:15,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:15,160 INFO L85 PathProgramCache]: Analyzing trace with hash -555382060, now seen corresponding path program 5 times [2022-03-18 00:45:15,160 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:15,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [102306471] [2022-03-18 00:45:15,324 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:15,324 INFO L85 PathProgramCache]: Analyzing trace with hash -1125859471, now seen corresponding path program 1 times [2022-03-18 00:45:15,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:15,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214508089] [2022-03-18 00:45:15,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:15,325 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:15,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:15,333 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:15,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:15,341 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:15,341 INFO L85 PathProgramCache]: Analyzing trace with hash -555382060, now seen corresponding path program 6 times [2022-03-18 00:45:15,342 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:15,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [825980348] [2022-03-18 00:45:15,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:15,342 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:15,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:15,424 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:15,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:15,430 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:15,430 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:15,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [825980348] [2022-03-18 00:45:15,430 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [825980348] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:15,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1853455445] [2022-03-18 00:45:15,431 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:45:15,431 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:15,431 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:15,440 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) [2022-03-18 00:45:15,441 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-18 00:45:15,492 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-18 00:45:15,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:15,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-18 00:45:15,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:15,590 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-18 00:45:15,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:15,725 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-18 00:45:15,725 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1853455445] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:15,725 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:15,725 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 7] total 15 [2022-03-18 00:45:15,725 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:15,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [102306471] [2022-03-18 00:45:15,725 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [102306471] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:15,725 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:15,726 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-18 00:45:15,726 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408093746] [2022-03-18 00:45:15,726 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:15,727 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-18 00:45:15,727 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:15,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-18 00:45:15,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2022-03-18 00:45:15,727 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) [2022-03-18 00:45:15,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:15,817 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2022-03-18 00:45:15,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-18 00:45:15,818 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 [2022-03-18 00:45:15,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:15,819 INFO L225 Difference]: With dead ends: 30 [2022-03-18 00:45:15,819 INFO L226 Difference]: Without dead ends: 23 [2022-03-18 00:45:15,820 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2022-03-18 00:45:15,821 INFO L912 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 [2022-03-18 00:45:15,821 INFO L913 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] [2022-03-18 00:45:15,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-18 00:45:15,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-03-18 00:45:15,832 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) [2022-03-18 00:45:15,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-03-18 00:45:15,835 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 19 [2022-03-18 00:45:15,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:15,836 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-03-18 00:45:15,836 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) [2022-03-18 00:45:15,836 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-03-18 00:45:15,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-18 00:45:15,836 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:15,836 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:15,853 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-18 00:45:16,041 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 [2022-03-18 00:45:16,041 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:16,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:16,042 INFO L85 PathProgramCache]: Analyzing trace with hash 795722097, now seen corresponding path program 7 times [2022-03-18 00:45:16,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:16,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [839817352] [2022-03-18 00:45:16,262 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:16,262 INFO L85 PathProgramCache]: Analyzing trace with hash -1066754127, now seen corresponding path program 1 times [2022-03-18 00:45:16,262 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:16,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1473797227] [2022-03-18 00:45:16,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:16,262 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:16,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:16,284 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:16,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:16,303 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:16,303 INFO L85 PathProgramCache]: Analyzing trace with hash 795722097, now seen corresponding path program 8 times [2022-03-18 00:45:16,303 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:16,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [462333881] [2022-03-18 00:45:16,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:16,303 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:16,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:16,368 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:16,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:16,382 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:16,382 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:16,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [462333881] [2022-03-18 00:45:16,383 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [462333881] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:16,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [122952943] [2022-03-18 00:45:16,383 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:45:16,383 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:16,383 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:16,400 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) [2022-03-18 00:45:16,451 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-18 00:45:16,455 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:45:16,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:16,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-18 00:45:16,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:16,534 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:16,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:16,793 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:16,793 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [122952943] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:16,793 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:16,794 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 19 [2022-03-18 00:45:16,794 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:16,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [839817352] [2022-03-18 00:45:16,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [839817352] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:16,794 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:16,794 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-18 00:45:16,794 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854425355] [2022-03-18 00:45:16,794 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:16,794 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-18 00:45:16,794 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:16,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-18 00:45:16,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=259, Unknown=0, NotChecked=0, Total=342 [2022-03-18 00:45:16,795 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) [2022-03-18 00:45:16,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:16,892 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2022-03-18 00:45:16,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-18 00:45:16,892 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 [2022-03-18 00:45:16,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:16,893 INFO L225 Difference]: With dead ends: 32 [2022-03-18 00:45:16,893 INFO L226 Difference]: Without dead ends: 25 [2022-03-18 00:45:16,893 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=411, Unknown=0, NotChecked=0, Total=552 [2022-03-18 00:45:16,894 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 13 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:16,894 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 34 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 00:45:16,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-03-18 00:45:16,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-03-18 00:45:16,902 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) [2022-03-18 00:45:16,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-03-18 00:45:16,903 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 21 [2022-03-18 00:45:16,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:16,903 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-03-18 00:45:16,903 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) [2022-03-18 00:45:16,903 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-03-18 00:45:16,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-18 00:45:16,904 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:16,904 INFO L500 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:16,937 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-18 00:45:17,121 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 [2022-03-18 00:45:17,121 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:17,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:17,122 INFO L85 PathProgramCache]: Analyzing trace with hash 2126693582, now seen corresponding path program 9 times [2022-03-18 00:45:17,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:17,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1447781840] [2022-03-18 00:45:17,292 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:17,292 INFO L85 PathProgramCache]: Analyzing trace with hash -1007648783, now seen corresponding path program 1 times [2022-03-18 00:45:17,292 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:17,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [98013257] [2022-03-18 00:45:17,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:17,293 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:17,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:17,308 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:17,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:17,323 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:17,323 INFO L85 PathProgramCache]: Analyzing trace with hash 2126693582, now seen corresponding path program 10 times [2022-03-18 00:45:17,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:17,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2086910224] [2022-03-18 00:45:17,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:17,324 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:17,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:17,418 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:17,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:17,422 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:17,423 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:17,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2086910224] [2022-03-18 00:45:17,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2086910224] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:17,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [555693959] [2022-03-18 00:45:17,424 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:45:17,424 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:17,424 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:17,425 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) [2022-03-18 00:45:17,426 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-18 00:45:17,454 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:45:17,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:17,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-18 00:45:17,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:17,531 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:17,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:17,726 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:17,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [555693959] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:17,727 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:17,727 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 17 [2022-03-18 00:45:17,727 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:17,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1447781840] [2022-03-18 00:45:17,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1447781840] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:17,727 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:17,727 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-18 00:45:17,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502482921] [2022-03-18 00:45:17,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:17,728 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-18 00:45:17,728 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:17,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-18 00:45:17,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=185, Unknown=0, NotChecked=0, Total=272 [2022-03-18 00:45:17,728 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) [2022-03-18 00:45:17,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:17,828 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2022-03-18 00:45:17,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-18 00:45:17,828 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 [2022-03-18 00:45:17,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:17,829 INFO L225 Difference]: With dead ends: 34 [2022-03-18 00:45:17,829 INFO L226 Difference]: Without dead ends: 27 [2022-03-18 00:45:17,829 INFO L911 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 [2022-03-18 00:45:17,829 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 14 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:17,829 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 44 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 00:45:17,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-03-18 00:45:17,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-03-18 00:45:17,833 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) [2022-03-18 00:45:17,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2022-03-18 00:45:17,834 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 23 [2022-03-18 00:45:17,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:17,834 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2022-03-18 00:45:17,834 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) [2022-03-18 00:45:17,834 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2022-03-18 00:45:17,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-18 00:45:17,835 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:17,835 INFO L500 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:17,851 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-03-18 00:45:18,050 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 [2022-03-18 00:45:18,051 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:18,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:18,051 INFO L85 PathProgramCache]: Analyzing trace with hash 1290036459, now seen corresponding path program 11 times [2022-03-18 00:45:18,051 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:18,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2116132408] [2022-03-18 00:45:18,196 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:18,197 INFO L85 PathProgramCache]: Analyzing trace with hash -948543439, now seen corresponding path program 1 times [2022-03-18 00:45:18,197 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:18,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [895149824] [2022-03-18 00:45:18,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:18,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:18,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:18,218 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:18,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:18,242 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:18,242 INFO L85 PathProgramCache]: Analyzing trace with hash 1290036459, now seen corresponding path program 12 times [2022-03-18 00:45:18,242 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:18,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1866669051] [2022-03-18 00:45:18,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:18,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:18,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:18,331 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:18,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:18,334 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:18,334 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:18,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1866669051] [2022-03-18 00:45:18,335 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1866669051] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:18,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1812699338] [2022-03-18 00:45:18,335 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:45:18,335 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:18,335 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:18,349 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) [2022-03-18 00:45:18,350 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-18 00:45:18,397 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-18 00:45:18,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:18,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-18 00:45:18,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:18,532 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 25 proven. 4 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-18 00:45:18,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:18,809 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 25 proven. 4 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-18 00:45:18,809 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1812699338] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:18,809 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:18,809 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5, 9] total 20 [2022-03-18 00:45:18,810 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:18,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2116132408] [2022-03-18 00:45:18,810 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2116132408] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:18,810 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:18,811 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-18 00:45:18,811 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195049445] [2022-03-18 00:45:18,811 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:18,811 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-18 00:45:18,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:18,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-18 00:45:18,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=284, Unknown=0, NotChecked=0, Total=380 [2022-03-18 00:45:18,812 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) [2022-03-18 00:45:18,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:18,936 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2022-03-18 00:45:18,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-18 00:45:18,936 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 [2022-03-18 00:45:18,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:18,937 INFO L225 Difference]: With dead ends: 36 [2022-03-18 00:45:18,937 INFO L226 Difference]: Without dead ends: 29 [2022-03-18 00:45:18,938 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=173, Invalid=529, Unknown=0, NotChecked=0, Total=702 [2022-03-18 00:45:18,939 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 15 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:18,940 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 34 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 00:45:18,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-18 00:45:18,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-03-18 00:45:18,945 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) [2022-03-18 00:45:18,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2022-03-18 00:45:18,946 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 25 [2022-03-18 00:45:18,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:18,947 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2022-03-18 00:45:18,947 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) [2022-03-18 00:45:18,947 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2022-03-18 00:45:18,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-18 00:45:18,947 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:18,948 INFO L500 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:18,961 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-18 00:45:19,152 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 [2022-03-18 00:45:19,153 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:19,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:19,154 INFO L85 PathProgramCache]: Analyzing trace with hash 421425608, now seen corresponding path program 13 times [2022-03-18 00:45:19,154 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:19,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [623336920] [2022-03-18 00:45:19,302 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:19,302 INFO L85 PathProgramCache]: Analyzing trace with hash -889438095, now seen corresponding path program 1 times [2022-03-18 00:45:19,303 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:19,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559805889] [2022-03-18 00:45:19,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:19,303 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:19,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:19,312 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:19,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:19,327 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:19,327 INFO L85 PathProgramCache]: Analyzing trace with hash 421425608, now seen corresponding path program 14 times [2022-03-18 00:45:19,327 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:19,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [870451466] [2022-03-18 00:45:19,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:19,328 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:19,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:19,406 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:19,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:19,409 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:19,409 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:19,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [870451466] [2022-03-18 00:45:19,409 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [870451466] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:19,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [513395128] [2022-03-18 00:45:19,409 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:45:19,409 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:19,409 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:19,410 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) [2022-03-18 00:45:19,442 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-18 00:45:19,459 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:45:19,459 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:19,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-18 00:45:19,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:19,541 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:19,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:19,736 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:19,736 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [513395128] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:19,736 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:19,736 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 22 [2022-03-18 00:45:19,737 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:19,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [623336920] [2022-03-18 00:45:19,737 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [623336920] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:19,737 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:19,737 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-18 00:45:19,737 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696611663] [2022-03-18 00:45:19,737 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:19,737 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-18 00:45:19,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:19,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-18 00:45:19,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=323, Unknown=0, NotChecked=0, Total=462 [2022-03-18 00:45:19,738 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) [2022-03-18 00:45:19,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:19,870 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2022-03-18 00:45:19,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-18 00:45:19,870 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 [2022-03-18 00:45:19,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:19,871 INFO L225 Difference]: With dead ends: 38 [2022-03-18 00:45:19,871 INFO L226 Difference]: Without dead ends: 31 [2022-03-18 00:45:19,871 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=257, Invalid=613, Unknown=0, NotChecked=0, Total=870 [2022-03-18 00:45:19,871 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 16 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:19,872 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 34 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 00:45:19,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-03-18 00:45:19,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-03-18 00:45:19,875 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) [2022-03-18 00:45:19,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2022-03-18 00:45:19,876 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 27 [2022-03-18 00:45:19,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:19,876 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2022-03-18 00:45:19,876 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) [2022-03-18 00:45:19,876 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2022-03-18 00:45:19,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-18 00:45:19,876 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:19,876 INFO L500 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:19,916 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-03-18 00:45:20,093 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 [2022-03-18 00:45:20,093 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:20,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:20,094 INFO L85 PathProgramCache]: Analyzing trace with hash -1089946779, now seen corresponding path program 15 times [2022-03-18 00:45:20,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:20,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2036837108] [2022-03-18 00:45:20,230 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:20,230 INFO L85 PathProgramCache]: Analyzing trace with hash -830332751, now seen corresponding path program 1 times [2022-03-18 00:45:20,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:20,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615908674] [2022-03-18 00:45:20,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:20,230 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:20,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:20,235 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:20,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:20,240 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:20,240 INFO L85 PathProgramCache]: Analyzing trace with hash -1089946779, now seen corresponding path program 16 times [2022-03-18 00:45:20,240 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:20,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1515605598] [2022-03-18 00:45:20,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:20,241 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:20,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:20,348 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:20,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:20,351 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:20,351 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:20,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1515605598] [2022-03-18 00:45:20,351 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1515605598] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:20,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [509397600] [2022-03-18 00:45:20,351 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:45:20,351 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:20,351 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:20,364 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) [2022-03-18 00:45:20,379 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-18 00:45:20,407 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:45:20,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:20,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-18 00:45:20,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:20,516 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:20,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:20,742 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:20,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [509397600] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:20,742 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:20,742 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-03-18 00:45:20,743 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:20,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2036837108] [2022-03-18 00:45:20,743 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2036837108] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:20,743 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:20,743 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-18 00:45:20,743 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283052658] [2022-03-18 00:45:20,743 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:20,743 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-18 00:45:20,743 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:20,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-18 00:45:20,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=388, Unknown=0, NotChecked=0, Total=552 [2022-03-18 00:45:20,744 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) [2022-03-18 00:45:20,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:20,901 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2022-03-18 00:45:20,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-18 00:45:20,902 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 [2022-03-18 00:45:20,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:20,902 INFO L225 Difference]: With dead ends: 40 [2022-03-18 00:45:20,902 INFO L226 Difference]: Without dead ends: 33 [2022-03-18 00:45:20,902 INFO L911 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 [2022-03-18 00:45:20,903 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 17 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:20,903 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 44 Invalid, 194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 00:45:20,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-18 00:45:20,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-03-18 00:45:20,907 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) [2022-03-18 00:45:20,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2022-03-18 00:45:20,907 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 29 [2022-03-18 00:45:20,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:20,907 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2022-03-18 00:45:20,907 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) [2022-03-18 00:45:20,907 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2022-03-18 00:45:20,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-18 00:45:20,910 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:20,910 INFO L500 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:20,944 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-18 00:45:21,123 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 [2022-03-18 00:45:21,124 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:21,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:21,124 INFO L85 PathProgramCache]: Analyzing trace with hash -1819864638, now seen corresponding path program 17 times [2022-03-18 00:45:21,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:21,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [518837144] [2022-03-18 00:45:21,266 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:21,266 INFO L85 PathProgramCache]: Analyzing trace with hash -771227407, now seen corresponding path program 1 times [2022-03-18 00:45:21,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:21,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1922185753] [2022-03-18 00:45:21,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:21,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:21,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:21,287 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:21,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:21,293 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:21,294 INFO L85 PathProgramCache]: Analyzing trace with hash -1819864638, now seen corresponding path program 18 times [2022-03-18 00:45:21,294 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:21,294 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851362030] [2022-03-18 00:45:21,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:21,294 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:21,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:21,416 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:21,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:21,419 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:21,420 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:21,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851362030] [2022-03-18 00:45:21,420 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [851362030] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:21,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2119039279] [2022-03-18 00:45:21,420 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:45:21,420 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:21,420 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:21,436 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) [2022-03-18 00:45:21,438 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-18 00:45:21,475 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-18 00:45:21,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:21,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-18 00:45:21,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:21,557 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 1 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2022-03-18 00:45:21,558 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:21,744 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 1 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2022-03-18 00:45:21,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2119039279] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:21,744 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:21,745 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 4, 8] total 21 [2022-03-18 00:45:21,745 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:21,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [518837144] [2022-03-18 00:45:21,745 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [518837144] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:21,745 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:21,745 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-18 00:45:21,745 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405881653] [2022-03-18 00:45:21,745 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:21,745 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-18 00:45:21,745 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:21,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-18 00:45:21,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=325, Unknown=0, NotChecked=0, Total=420 [2022-03-18 00:45:21,746 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) [2022-03-18 00:45:21,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:21,933 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2022-03-18 00:45:21,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-18 00:45:21,934 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 [2022-03-18 00:45:21,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:21,934 INFO L225 Difference]: With dead ends: 42 [2022-03-18 00:45:21,934 INFO L226 Difference]: Without dead ends: 35 [2022-03-18 00:45:21,935 INFO L911 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 [2022-03-18 00:45:21,935 INFO L912 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 [2022-03-18 00:45:21,935 INFO L913 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] [2022-03-18 00:45:21,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-18 00:45:21,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-03-18 00:45:21,939 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) [2022-03-18 00:45:21,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-03-18 00:45:21,939 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 31 [2022-03-18 00:45:21,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:21,939 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-03-18 00:45:21,940 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) [2022-03-18 00:45:21,940 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-03-18 00:45:21,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-18 00:45:21,940 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:21,940 INFO L500 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:21,966 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-18 00:45:22,166 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 [2022-03-18 00:45:22,166 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:22,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:22,166 INFO L85 PathProgramCache]: Analyzing trace with hash 1103709407, now seen corresponding path program 19 times [2022-03-18 00:45:22,166 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:22,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [958106289] [2022-03-18 00:45:22,289 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:22,290 INFO L85 PathProgramCache]: Analyzing trace with hash -712122063, now seen corresponding path program 1 times [2022-03-18 00:45:22,290 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:22,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1736022125] [2022-03-18 00:45:22,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:22,290 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:22,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:22,296 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:22,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:22,301 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:22,301 INFO L85 PathProgramCache]: Analyzing trace with hash 1103709407, now seen corresponding path program 20 times [2022-03-18 00:45:22,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:22,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1481916400] [2022-03-18 00:45:22,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:22,302 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:22,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:22,440 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:22,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:22,445 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:22,445 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:22,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1481916400] [2022-03-18 00:45:22,445 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1481916400] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:22,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [771961062] [2022-03-18 00:45:22,445 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:45:22,445 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:22,445 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:22,460 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) [2022-03-18 00:45:22,485 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-18 00:45:22,493 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:45:22,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:22,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-18 00:45:22,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:22,640 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:22,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:22,962 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:22,962 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [771961062] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:22,963 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:22,963 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 28 [2022-03-18 00:45:22,963 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:22,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [958106289] [2022-03-18 00:45:22,963 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [958106289] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:22,963 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:22,963 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-18 00:45:22,963 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369638309] [2022-03-18 00:45:22,963 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:22,963 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-18 00:45:22,964 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:22,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-18 00:45:22,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=536, Unknown=0, NotChecked=0, Total=756 [2022-03-18 00:45:22,964 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) [2022-03-18 00:45:23,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:23,168 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2022-03-18 00:45:23,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-18 00:45:23,169 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 [2022-03-18 00:45:23,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:23,169 INFO L225 Difference]: With dead ends: 44 [2022-03-18 00:45:23,169 INFO L226 Difference]: Without dead ends: 37 [2022-03-18 00:45:23,170 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 53 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=416, Invalid=1066, Unknown=0, NotChecked=0, Total=1482 [2022-03-18 00:45:23,170 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 19 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:23,171 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 19 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 00:45:23,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-03-18 00:45:23,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-03-18 00:45:23,175 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) [2022-03-18 00:45:23,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2022-03-18 00:45:23,175 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 33 [2022-03-18 00:45:23,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:23,176 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2022-03-18 00:45:23,176 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) [2022-03-18 00:45:23,176 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2022-03-18 00:45:23,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-18 00:45:23,176 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:23,176 INFO L500 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:23,199 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-18 00:45:23,376 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 [2022-03-18 00:45:23,377 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:23,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:23,377 INFO L85 PathProgramCache]: Analyzing trace with hash 1749755068, now seen corresponding path program 21 times [2022-03-18 00:45:23,377 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:23,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [268867527] [2022-03-18 00:45:23,497 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:23,498 INFO L85 PathProgramCache]: Analyzing trace with hash -653016719, now seen corresponding path program 1 times [2022-03-18 00:45:23,498 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:23,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324899159] [2022-03-18 00:45:23,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:23,498 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:23,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:23,516 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:23,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:23,525 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:23,526 INFO L85 PathProgramCache]: Analyzing trace with hash 1749755068, now seen corresponding path program 22 times [2022-03-18 00:45:23,526 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:23,526 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766637125] [2022-03-18 00:45:23,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:23,526 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:23,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:23,689 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:23,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:23,691 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 12 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:23,692 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:23,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766637125] [2022-03-18 00:45:23,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766637125] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:23,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510267673] [2022-03-18 00:45:23,692 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:45:23,692 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:23,692 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:23,693 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) [2022-03-18 00:45:23,694 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-18 00:45:23,723 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:45:23,723 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:23,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-18 00:45:23,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:23,842 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:23,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:24,336 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:24,337 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510267673] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:24,337 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:24,337 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 30 [2022-03-18 00:45:24,337 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:24,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [268867527] [2022-03-18 00:45:24,337 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [268867527] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:24,337 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:24,337 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-18 00:45:24,337 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827554553] [2022-03-18 00:45:24,337 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:24,338 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-18 00:45:24,338 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:24,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-18 00:45:24,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=619, Unknown=0, NotChecked=0, Total=870 [2022-03-18 00:45:24,338 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) [2022-03-18 00:45:24,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:24,557 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2022-03-18 00:45:24,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-18 00:45:24,557 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 [2022-03-18 00:45:24,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:24,566 INFO L225 Difference]: With dead ends: 46 [2022-03-18 00:45:24,566 INFO L226 Difference]: Without dead ends: 39 [2022-03-18 00:45:24,567 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=477, Invalid=1245, Unknown=0, NotChecked=0, Total=1722 [2022-03-18 00:45:24,568 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 20 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 328 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 328 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:24,568 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 74 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 328 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 00:45:24,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-03-18 00:45:24,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2022-03-18 00:45:24,575 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) [2022-03-18 00:45:24,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2022-03-18 00:45:24,578 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 35 [2022-03-18 00:45:24,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:24,579 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2022-03-18 00:45:24,579 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) [2022-03-18 00:45:24,579 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2022-03-18 00:45:24,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-18 00:45:24,579 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:24,579 INFO L500 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:24,599 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-03-18 00:45:24,796 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 [2022-03-18 00:45:24,796 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:24,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:24,797 INFO L85 PathProgramCache]: Analyzing trace with hash -170622631, now seen corresponding path program 23 times [2022-03-18 00:45:24,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:24,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1929206986] [2022-03-18 00:45:24,948 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:24,948 INFO L85 PathProgramCache]: Analyzing trace with hash -593911375, now seen corresponding path program 1 times [2022-03-18 00:45:24,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:24,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622722775] [2022-03-18 00:45:24,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:24,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:24,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:24,958 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:24,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:24,970 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:24,970 INFO L85 PathProgramCache]: Analyzing trace with hash -170622631, now seen corresponding path program 24 times [2022-03-18 00:45:24,970 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:24,970 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1353406891] [2022-03-18 00:45:24,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:24,970 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:24,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:25,134 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:25,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:25,139 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 13 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:25,139 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:25,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1353406891] [2022-03-18 00:45:25,139 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1353406891] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:25,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2142152969] [2022-03-18 00:45:25,140 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:45:25,140 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:25,140 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:25,141 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) [2022-03-18 00:45:25,142 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-18 00:45:25,176 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-18 00:45:25,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:25,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-18 00:45:25,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:25,278 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 36 proven. 1 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2022-03-18 00:45:25,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:25,520 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 36 proven. 1 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2022-03-18 00:45:25,521 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2142152969] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:25,521 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:25,521 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 4, 8] total 24 [2022-03-18 00:45:25,521 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:25,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1929206986] [2022-03-18 00:45:25,521 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1929206986] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:25,521 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:25,521 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-18 00:45:25,521 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534065413] [2022-03-18 00:45:25,521 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:25,522 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-18 00:45:25,522 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:25,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-18 00:45:25,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2022-03-18 00:45:25,522 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) [2022-03-18 00:45:25,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:25,805 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2022-03-18 00:45:25,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-18 00:45:25,805 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 [2022-03-18 00:45:25,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:25,806 INFO L225 Difference]: With dead ends: 48 [2022-03-18 00:45:25,806 INFO L226 Difference]: Without dead ends: 41 [2022-03-18 00:45:25,806 INFO L911 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 [2022-03-18 00:45:25,807 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 21 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 333 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:25,807 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 39 Invalid, 360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 333 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 00:45:25,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-18 00:45:25,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-03-18 00:45:25,811 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) [2022-03-18 00:45:25,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2022-03-18 00:45:25,812 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 37 [2022-03-18 00:45:25,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:25,812 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2022-03-18 00:45:25,812 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) [2022-03-18 00:45:25,812 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2022-03-18 00:45:25,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-18 00:45:25,812 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:25,812 INFO L500 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:25,828 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-18 00:45:26,018 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 [2022-03-18 00:45:26,019 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:26,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:26,019 INFO L85 PathProgramCache]: Analyzing trace with hash 1182345910, now seen corresponding path program 25 times [2022-03-18 00:45:26,019 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:26,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1305605355] [2022-03-18 00:45:26,168 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:26,168 INFO L85 PathProgramCache]: Analyzing trace with hash -534806031, now seen corresponding path program 1 times [2022-03-18 00:45:26,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:26,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48034575] [2022-03-18 00:45:26,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:26,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:26,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:26,172 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:26,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:26,176 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:26,176 INFO L85 PathProgramCache]: Analyzing trace with hash 1182345910, now seen corresponding path program 26 times [2022-03-18 00:45:26,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:26,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687261013] [2022-03-18 00:45:26,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:26,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:26,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:26,357 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:26,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:26,360 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 14 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:26,360 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:26,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687261013] [2022-03-18 00:45:26,360 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1687261013] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:26,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1782950064] [2022-03-18 00:45:26,360 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:45:26,360 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:26,360 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:26,361 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) [2022-03-18 00:45:26,362 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-18 00:45:26,388 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:45:26,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:26,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-18 00:45:26,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:26,503 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:26,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:27,016 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:27,016 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1782950064] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:27,016 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:27,016 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 34 [2022-03-18 00:45:27,017 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:27,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1305605355] [2022-03-18 00:45:27,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1305605355] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:27,017 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:27,017 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-18 00:45:27,017 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887729276] [2022-03-18 00:45:27,017 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:27,017 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-18 00:45:27,017 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:27,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-18 00:45:27,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=803, Unknown=0, NotChecked=0, Total=1122 [2022-03-18 00:45:27,018 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) [2022-03-18 00:45:27,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:27,374 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2022-03-18 00:45:27,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-18 00:45:27,375 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 [2022-03-18 00:45:27,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:27,375 INFO L225 Difference]: With dead ends: 50 [2022-03-18 00:45:27,375 INFO L226 Difference]: Without dead ends: 43 [2022-03-18 00:45:27,376 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 62 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=611, Invalid=1645, Unknown=0, NotChecked=0, Total=2256 [2022-03-18 00:45:27,377 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 22 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 384 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 413 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:27,377 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 39 Invalid, 413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 384 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 00:45:27,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-03-18 00:45:27,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-03-18 00:45:27,385 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) [2022-03-18 00:45:27,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2022-03-18 00:45:27,386 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 39 [2022-03-18 00:45:27,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:27,387 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2022-03-18 00:45:27,387 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) [2022-03-18 00:45:27,387 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2022-03-18 00:45:27,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-18 00:45:27,389 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:27,389 INFO L500 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:27,418 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-18 00:45:27,607 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 [2022-03-18 00:45:27,607 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:27,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:27,607 INFO L85 PathProgramCache]: Analyzing trace with hash 10023123, now seen corresponding path program 27 times [2022-03-18 00:45:27,607 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:27,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1249682723] [2022-03-18 00:45:27,732 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:27,733 INFO L85 PathProgramCache]: Analyzing trace with hash -475700687, now seen corresponding path program 1 times [2022-03-18 00:45:27,733 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:27,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1693344856] [2022-03-18 00:45:27,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:27,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:27,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:27,754 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:27,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:27,760 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:27,760 INFO L85 PathProgramCache]: Analyzing trace with hash 10023123, now seen corresponding path program 28 times [2022-03-18 00:45:27,760 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:27,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172180373] [2022-03-18 00:45:27,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:27,760 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:27,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:27,982 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:27,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:27,985 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 15 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:27,985 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:27,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172180373] [2022-03-18 00:45:27,985 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [172180373] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:27,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [220862308] [2022-03-18 00:45:27,985 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:45:27,986 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:27,986 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:27,987 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) [2022-03-18 00:45:27,988 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-18 00:45:28,024 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:45:28,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:28,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-18 00:45:28,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:28,181 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:28,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:28,812 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:28,813 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [220862308] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:28,813 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:28,813 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 36 [2022-03-18 00:45:28,813 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:28,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1249682723] [2022-03-18 00:45:28,813 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1249682723] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:28,813 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:28,813 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-18 00:45:28,813 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286283787] [2022-03-18 00:45:28,813 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:28,813 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-18 00:45:28,813 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:28,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-18 00:45:28,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=904, Unknown=0, NotChecked=0, Total=1260 [2022-03-18 00:45:28,814 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) [2022-03-18 00:45:29,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:29,151 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2022-03-18 00:45:29,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-18 00:45:29,151 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 [2022-03-18 00:45:29,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:29,151 INFO L225 Difference]: With dead ends: 52 [2022-03-18 00:45:29,151 INFO L226 Difference]: Without dead ends: 45 [2022-03-18 00:45:29,152 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=684, Invalid=1866, Unknown=0, NotChecked=0, Total=2550 [2022-03-18 00:45:29,153 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 23 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 433 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 433 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:29,153 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 34 Invalid, 464 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 433 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 00:45:29,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-18 00:45:29,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-03-18 00:45:29,157 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) [2022-03-18 00:45:29,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2022-03-18 00:45:29,157 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 41 [2022-03-18 00:45:29,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:29,158 INFO L478 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2022-03-18 00:45:29,158 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) [2022-03-18 00:45:29,158 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2022-03-18 00:45:29,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-18 00:45:29,158 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:29,158 INFO L500 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:29,175 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-03-18 00:45:29,359 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 [2022-03-18 00:45:29,359 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:29,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:29,359 INFO L85 PathProgramCache]: Analyzing trace with hash -1310743632, now seen corresponding path program 29 times [2022-03-18 00:45:29,359 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:29,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [438147274] [2022-03-18 00:45:29,450 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:29,450 INFO L85 PathProgramCache]: Analyzing trace with hash -416595343, now seen corresponding path program 1 times [2022-03-18 00:45:29,450 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:29,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [567916412] [2022-03-18 00:45:29,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:29,450 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:29,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:29,471 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:29,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:29,482 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:29,482 INFO L85 PathProgramCache]: Analyzing trace with hash -1310743632, now seen corresponding path program 30 times [2022-03-18 00:45:29,482 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:29,482 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836004662] [2022-03-18 00:45:29,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:29,482 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:29,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:29,689 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:29,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:29,704 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 16 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:29,704 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:29,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [836004662] [2022-03-18 00:45:29,704 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [836004662] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:29,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2046051630] [2022-03-18 00:45:29,704 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:45:29,704 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:29,704 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:29,705 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) [2022-03-18 00:45:29,728 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-18 00:45:29,777 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-18 00:45:29,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:29,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-18 00:45:29,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:29,899 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 45 proven. 1 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-03-18 00:45:29,899 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:30,188 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 45 proven. 1 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-03-18 00:45:30,188 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2046051630] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:30,188 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:30,188 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 4, 8] total 27 [2022-03-18 00:45:30,188 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:30,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [438147274] [2022-03-18 00:45:30,189 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [438147274] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:30,189 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:30,189 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-18 00:45:30,189 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428148706] [2022-03-18 00:45:30,189 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:30,189 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-18 00:45:30,189 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:30,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-18 00:45:30,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2022-03-18 00:45:30,190 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) [2022-03-18 00:45:30,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:30,563 INFO L93 Difference]: Finished difference Result 54 states and 58 transitions. [2022-03-18 00:45:30,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-18 00:45:30,563 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 [2022-03-18 00:45:30,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:30,564 INFO L225 Difference]: With dead ends: 54 [2022-03-18 00:45:30,564 INFO L226 Difference]: Without dead ends: 47 [2022-03-18 00:45:30,564 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=293, Invalid=1513, Unknown=0, NotChecked=0, Total=1806 [2022-03-18 00:45:30,565 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 24 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 480 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:30,565 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 24 Invalid, 513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 480 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 00:45:30,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-03-18 00:45:30,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-03-18 00:45:30,570 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) [2022-03-18 00:45:30,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2022-03-18 00:45:30,570 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 43 [2022-03-18 00:45:30,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:30,570 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2022-03-18 00:45:30,570 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) [2022-03-18 00:45:30,570 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2022-03-18 00:45:30,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-18 00:45:30,570 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:30,570 INFO L500 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:30,574 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-03-18 00:45:30,774 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 [2022-03-18 00:45:30,774 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:30,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:30,775 INFO L85 PathProgramCache]: Analyzing trace with hash 742724429, now seen corresponding path program 31 times [2022-03-18 00:45:30,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:30,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [918756200] [2022-03-18 00:45:30,874 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:30,874 INFO L85 PathProgramCache]: Analyzing trace with hash -357489999, now seen corresponding path program 1 times [2022-03-18 00:45:30,874 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:30,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559456608] [2022-03-18 00:45:30,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:30,875 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:30,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:30,886 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:30,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:30,902 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:30,902 INFO L85 PathProgramCache]: Analyzing trace with hash 742724429, now seen corresponding path program 32 times [2022-03-18 00:45:30,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:30,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194055609] [2022-03-18 00:45:30,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:30,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:30,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:31,134 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:31,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:31,153 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 17 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:31,153 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:31,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194055609] [2022-03-18 00:45:31,154 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1194055609] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:31,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [56233845] [2022-03-18 00:45:31,154 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:45:31,154 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:31,154 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:31,168 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) [2022-03-18 00:45:31,170 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-18 00:45:31,212 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:45:31,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:31,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 40 conjunts are in the unsatisfiable core [2022-03-18 00:45:31,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:31,402 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:31,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:32,368 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:32,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [56233845] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:32,369 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:32,369 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 23] total 43 [2022-03-18 00:45:32,369 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:32,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [918756200] [2022-03-18 00:45:32,369 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [918756200] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:32,369 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:32,369 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-18 00:45:32,369 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59777247] [2022-03-18 00:45:32,369 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:32,369 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-18 00:45:32,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:32,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-18 00:45:32,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=443, Invalid=1363, Unknown=0, NotChecked=0, Total=1806 [2022-03-18 00:45:32,370 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) [2022-03-18 00:45:32,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:32,861 INFO L93 Difference]: Finished difference Result 56 states and 60 transitions. [2022-03-18 00:45:32,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-18 00:45:32,861 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 [2022-03-18 00:45:32,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:32,862 INFO L225 Difference]: With dead ends: 56 [2022-03-18 00:45:32,862 INFO L226 Difference]: Without dead ends: 49 [2022-03-18 00:45:32,862 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 68 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=849, Invalid=2691, Unknown=0, NotChecked=0, Total=3540 [2022-03-18 00:45:32,863 INFO L912 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 [2022-03-18 00:45:32,863 INFO L913 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] [2022-03-18 00:45:32,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-03-18 00:45:32,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-03-18 00:45:32,868 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) [2022-03-18 00:45:32,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2022-03-18 00:45:32,868 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 45 [2022-03-18 00:45:32,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:32,868 INFO L478 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2022-03-18 00:45:32,868 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) [2022-03-18 00:45:32,868 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2022-03-18 00:45:32,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-18 00:45:32,869 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:32,869 INFO L500 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:32,888 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-18 00:45:33,069 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 [2022-03-18 00:45:33,070 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:33,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:33,070 INFO L85 PathProgramCache]: Analyzing trace with hash -1559425110, now seen corresponding path program 33 times [2022-03-18 00:45:33,070 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:33,070 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1168208562] [2022-03-18 00:45:33,212 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:33,212 INFO L85 PathProgramCache]: Analyzing trace with hash -298384655, now seen corresponding path program 1 times [2022-03-18 00:45:33,213 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:33,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137506046] [2022-03-18 00:45:33,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:33,213 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:33,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:33,221 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:33,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:33,225 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:33,225 INFO L85 PathProgramCache]: Analyzing trace with hash -1559425110, now seen corresponding path program 34 times [2022-03-18 00:45:33,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:33,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [852362363] [2022-03-18 00:45:33,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:33,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:33,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:33,478 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:33,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:33,481 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 18 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:33,482 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:33,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [852362363] [2022-03-18 00:45:33,482 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [852362363] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:33,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [446989610] [2022-03-18 00:45:33,482 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:45:33,482 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:33,482 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:33,493 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) [2022-03-18 00:45:33,494 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-18 00:45:33,535 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:45:33,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:33,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 38 conjunts are in the unsatisfiable core [2022-03-18 00:45:33,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:33,688 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 18 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:33,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:34,766 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 18 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:34,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [446989610] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:34,766 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:34,767 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 21] total 41 [2022-03-18 00:45:34,767 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:34,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1168208562] [2022-03-18 00:45:34,767 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1168208562] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:34,767 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:34,767 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-18 00:45:34,767 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753419028] [2022-03-18 00:45:34,767 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:34,767 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-18 00:45:34,767 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:34,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-18 00:45:34,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=459, Invalid=1181, Unknown=0, NotChecked=0, Total=1640 [2022-03-18 00:45:34,768 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) [2022-03-18 00:45:35,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:35,140 INFO L93 Difference]: Finished difference Result 58 states and 62 transitions. [2022-03-18 00:45:35,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-18 00:45:35,140 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 [2022-03-18 00:45:35,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:35,140 INFO L225 Difference]: With dead ends: 58 [2022-03-18 00:45:35,140 INFO L226 Difference]: Without dead ends: 51 [2022-03-18 00:45:35,141 INFO L911 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 [2022-03-18 00:45:35,143 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 26 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 634 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 671 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 634 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:35,143 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 44 Invalid, 671 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 634 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 00:45:35,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-03-18 00:45:35,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-03-18 00:45:35,159 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) [2022-03-18 00:45:35,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2022-03-18 00:45:35,160 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 47 [2022-03-18 00:45:35,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:35,160 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2022-03-18 00:45:35,160 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) [2022-03-18 00:45:35,160 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2022-03-18 00:45:35,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-18 00:45:35,160 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:35,160 INFO L500 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:35,179 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-18 00:45:35,373 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 [2022-03-18 00:45:35,373 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:35,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:35,374 INFO L85 PathProgramCache]: Analyzing trace with hash -2016974649, now seen corresponding path program 35 times [2022-03-18 00:45:35,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:35,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [787554540] [2022-03-18 00:45:35,538 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:35,538 INFO L85 PathProgramCache]: Analyzing trace with hash -239279311, now seen corresponding path program 1 times [2022-03-18 00:45:35,539 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:35,539 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467220454] [2022-03-18 00:45:35,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:35,539 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:35,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:35,567 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:35,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:35,607 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:35,607 INFO L85 PathProgramCache]: Analyzing trace with hash -2016974649, now seen corresponding path program 36 times [2022-03-18 00:45:35,607 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:35,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349250090] [2022-03-18 00:45:35,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:35,607 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:35,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:35,898 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:35,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:35,901 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 19 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:35,901 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:35,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349250090] [2022-03-18 00:45:35,902 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1349250090] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:35,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1348525154] [2022-03-18 00:45:35,902 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:45:35,902 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:35,902 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:35,903 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) [2022-03-18 00:45:35,904 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-18 00:45:35,938 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-18 00:45:35,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:35,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-18 00:45:35,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:36,081 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 54 proven. 1 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2022-03-18 00:45:36,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:36,352 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 54 proven. 1 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2022-03-18 00:45:36,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1348525154] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:36,353 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:36,353 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 4, 8] total 30 [2022-03-18 00:45:36,353 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:36,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [787554540] [2022-03-18 00:45:36,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [787554540] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:36,353 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:36,353 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-18 00:45:36,353 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103950142] [2022-03-18 00:45:36,353 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:36,353 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-18 00:45:36,353 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:36,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-18 00:45:36,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=712, Unknown=0, NotChecked=0, Total=870 [2022-03-18 00:45:36,354 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) [2022-03-18 00:45:36,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:36,894 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2022-03-18 00:45:36,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-18 00:45:36,894 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 [2022-03-18 00:45:36,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:36,895 INFO L225 Difference]: With dead ends: 60 [2022-03-18 00:45:36,895 INFO L226 Difference]: Without dead ends: 53 [2022-03-18 00:45:36,896 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=344, Invalid=2008, Unknown=0, NotChecked=0, Total=2352 [2022-03-18 00:45:36,896 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 27 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 729 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 768 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 729 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:36,896 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 64 Invalid, 768 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 729 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-18 00:45:36,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-03-18 00:45:36,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-03-18 00:45:36,902 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) [2022-03-18 00:45:36,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2022-03-18 00:45:36,902 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 49 [2022-03-18 00:45:36,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:36,902 INFO L478 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2022-03-18 00:45:36,902 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) [2022-03-18 00:45:36,902 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2022-03-18 00:45:36,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-03-18 00:45:36,903 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:36,903 INFO L500 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:36,919 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-18 00:45:37,118 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 [2022-03-18 00:45:37,118 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:37,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:37,119 INFO L85 PathProgramCache]: Analyzing trace with hash 659549860, now seen corresponding path program 37 times [2022-03-18 00:45:37,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:37,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [37489693] [2022-03-18 00:45:37,257 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:37,257 INFO L85 PathProgramCache]: Analyzing trace with hash -180173967, now seen corresponding path program 1 times [2022-03-18 00:45:37,257 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:37,257 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70927112] [2022-03-18 00:45:37,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:37,257 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:37,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:37,265 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:37,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:37,284 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:37,284 INFO L85 PathProgramCache]: Analyzing trace with hash 659549860, now seen corresponding path program 38 times [2022-03-18 00:45:37,284 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:37,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1211316291] [2022-03-18 00:45:37,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:37,285 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:37,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:37,609 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:37,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:37,612 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:37,612 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:37,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1211316291] [2022-03-18 00:45:37,612 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1211316291] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:37,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [986059049] [2022-03-18 00:45:37,612 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:45:37,612 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:37,612 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:37,613 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) [2022-03-18 00:45:37,616 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-18 00:45:37,655 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:45:37,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:37,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-18 00:45:37,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:37,834 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:37,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:39,222 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:39,222 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [986059049] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:39,222 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:39,222 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 23] total 45 [2022-03-18 00:45:39,223 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:39,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [37489693] [2022-03-18 00:45:39,223 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [37489693] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:39,223 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:39,223 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-18 00:45:39,223 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529446755] [2022-03-18 00:45:39,223 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:39,223 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-18 00:45:39,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:39,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-18 00:45:39,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=549, Invalid=1431, Unknown=0, NotChecked=0, Total=1980 [2022-03-18 00:45:39,224 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) [2022-03-18 00:45:39,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:39,802 INFO L93 Difference]: Finished difference Result 62 states and 66 transitions. [2022-03-18 00:45:39,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-18 00:45:39,802 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 [2022-03-18 00:45:39,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:39,803 INFO L225 Difference]: With dead ends: 62 [2022-03-18 00:45:39,803 INFO L226 Difference]: Without dead ends: 55 [2022-03-18 00:45:39,804 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1087, Invalid=3073, Unknown=0, NotChecked=0, Total=4160 [2022-03-18 00:45:39,804 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 28 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 828 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 869 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 828 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:39,804 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 84 Invalid, 869 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 828 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-18 00:45:39,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-18 00:45:39,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-03-18 00:45:39,809 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) [2022-03-18 00:45:39,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2022-03-18 00:45:39,810 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 51 [2022-03-18 00:45:39,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:39,810 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2022-03-18 00:45:39,810 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) [2022-03-18 00:45:39,810 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2022-03-18 00:45:39,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-03-18 00:45:39,810 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:39,810 INFO L500 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:39,828 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-03-18 00:45:40,023 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 [2022-03-18 00:45:40,023 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:40,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:40,024 INFO L85 PathProgramCache]: Analyzing trace with hash 114192705, now seen corresponding path program 39 times [2022-03-18 00:45:40,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:40,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [973029882] [2022-03-18 00:45:40,140 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:40,140 INFO L85 PathProgramCache]: Analyzing trace with hash -121068623, now seen corresponding path program 1 times [2022-03-18 00:45:40,140 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:40,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826962756] [2022-03-18 00:45:40,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:40,141 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:40,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:40,145 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:40,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:40,152 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:40,152 INFO L85 PathProgramCache]: Analyzing trace with hash 114192705, now seen corresponding path program 40 times [2022-03-18 00:45:40,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:40,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [318684732] [2022-03-18 00:45:40,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:40,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:40,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:40,457 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:40,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:40,460 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 21 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:40,460 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:40,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [318684732] [2022-03-18 00:45:40,460 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [318684732] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:40,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1721096972] [2022-03-18 00:45:40,460 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:45:40,460 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:40,461 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:40,462 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) [2022-03-18 00:45:40,463 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-18 00:45:40,506 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:45:40,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:40,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 45 conjunts are in the unsatisfiable core [2022-03-18 00:45:40,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:40,689 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:40,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:42,120 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:42,120 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1721096972] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:42,120 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:42,120 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2022-03-18 00:45:42,120 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:42,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [973029882] [2022-03-18 00:45:42,120 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [973029882] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:42,120 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:42,120 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-18 00:45:42,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981297045] [2022-03-18 00:45:42,121 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:42,121 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-18 00:45:42,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:42,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-18 00:45:42,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=620, Invalid=1636, Unknown=0, NotChecked=0, Total=2256 [2022-03-18 00:45:42,122 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) [2022-03-18 00:45:42,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:42,706 INFO L93 Difference]: Finished difference Result 64 states and 68 transitions. [2022-03-18 00:45:42,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-18 00:45:42,706 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 [2022-03-18 00:45:42,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:42,707 INFO L225 Difference]: With dead ends: 64 [2022-03-18 00:45:42,707 INFO L226 Difference]: Without dead ends: 57 [2022-03-18 00:45:42,708 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 83 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1206, Invalid=3486, Unknown=0, NotChecked=0, Total=4692 [2022-03-18 00:45:42,708 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 29 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 835 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 878 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 835 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:42,709 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 24 Invalid, 878 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 835 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-18 00:45:42,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-03-18 00:45:42,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-03-18 00:45:42,714 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) [2022-03-18 00:45:42,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2022-03-18 00:45:42,714 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 53 [2022-03-18 00:45:42,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:42,714 INFO L478 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2022-03-18 00:45:42,714 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) [2022-03-18 00:45:42,714 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2022-03-18 00:45:42,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-03-18 00:45:42,715 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:42,715 INFO L500 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:42,731 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-18 00:45:42,925 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 [2022-03-18 00:45:42,926 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:42,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:42,926 INFO L85 PathProgramCache]: Analyzing trace with hash 11976862, now seen corresponding path program 41 times [2022-03-18 00:45:42,926 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:42,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1283610747] [2022-03-18 00:45:43,051 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:43,051 INFO L85 PathProgramCache]: Analyzing trace with hash -61963279, now seen corresponding path program 1 times [2022-03-18 00:45:43,051 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:43,051 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856223223] [2022-03-18 00:45:43,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:43,051 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:43,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:43,057 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:43,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:43,060 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:43,060 INFO L85 PathProgramCache]: Analyzing trace with hash 11976862, now seen corresponding path program 42 times [2022-03-18 00:45:43,060 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:43,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1697354764] [2022-03-18 00:45:43,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:43,061 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:43,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:43,424 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:43,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:43,429 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 22 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:43,429 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:43,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1697354764] [2022-03-18 00:45:43,429 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1697354764] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:43,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [557974444] [2022-03-18 00:45:43,430 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:45:43,430 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:43,430 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:43,431 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) [2022-03-18 00:45:43,432 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-18 00:45:43,483 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-18 00:45:43,483 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:43,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-18 00:45:43,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:43,659 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 63 proven. 1 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2022-03-18 00:45:43,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:43,993 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 63 proven. 1 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2022-03-18 00:45:43,993 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [557974444] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:43,993 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:43,993 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 4, 8] total 33 [2022-03-18 00:45:43,993 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:43,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1283610747] [2022-03-18 00:45:43,993 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1283610747] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:43,993 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:43,994 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-03-18 00:45:43,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225247125] [2022-03-18 00:45:43,994 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:43,994 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-03-18 00:45:43,994 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:43,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-03-18 00:45:43,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=877, Unknown=0, NotChecked=0, Total=1056 [2022-03-18 00:45:43,994 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) [2022-03-18 00:45:44,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:44,698 INFO L93 Difference]: Finished difference Result 66 states and 70 transitions. [2022-03-18 00:45:44,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-03-18 00:45:44,699 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 [2022-03-18 00:45:44,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:44,699 INFO L225 Difference]: With dead ends: 66 [2022-03-18 00:45:44,699 INFO L226 Difference]: Without dead ends: 59 [2022-03-18 00:45:44,700 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=395, Invalid=2575, Unknown=0, NotChecked=0, Total=2970 [2022-03-18 00:45:44,701 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 30 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 960 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 1005 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 960 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:44,701 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 59 Invalid, 1005 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 960 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-18 00:45:44,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-03-18 00:45:44,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-03-18 00:45:44,706 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) [2022-03-18 00:45:44,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2022-03-18 00:45:44,706 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 55 [2022-03-18 00:45:44,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:44,706 INFO L478 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2022-03-18 00:45:44,706 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) [2022-03-18 00:45:44,706 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2022-03-18 00:45:44,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-03-18 00:45:44,707 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:44,707 INFO L500 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:44,711 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-03-18 00:45:44,911 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 [2022-03-18 00:45:44,911 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:44,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:44,911 INFO L85 PathProgramCache]: Analyzing trace with hash 566799547, now seen corresponding path program 43 times [2022-03-18 00:45:44,911 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:44,911 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [481388581] [2022-03-18 00:45:45,021 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:45,021 INFO L85 PathProgramCache]: Analyzing trace with hash -2857935, now seen corresponding path program 1 times [2022-03-18 00:45:45,021 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:45,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657995448] [2022-03-18 00:45:45,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:45,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:45,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:45,026 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:45,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:45,037 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:45,037 INFO L85 PathProgramCache]: Analyzing trace with hash 566799547, now seen corresponding path program 44 times [2022-03-18 00:45:45,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:45,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2047695068] [2022-03-18 00:45:45,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:45,037 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:45,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:45,404 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:45,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:45,407 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 23 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:45,407 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:45,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2047695068] [2022-03-18 00:45:45,408 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2047695068] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:45,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [423246934] [2022-03-18 00:45:45,408 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:45:45,408 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:45,408 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:45,420 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) [2022-03-18 00:45:45,422 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-18 00:45:45,476 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:45:45,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:45,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 49 conjunts are in the unsatisfiable core [2022-03-18 00:45:45,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:45,698 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:45,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:47,547 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:47,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [423246934] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:47,547 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:47,547 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 52 [2022-03-18 00:45:47,548 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:47,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [481388581] [2022-03-18 00:45:47,548 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [481388581] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:47,548 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:47,548 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-18 00:45:47,548 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663880969] [2022-03-18 00:45:47,548 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:47,548 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-18 00:45:47,548 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:47,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-18 00:45:47,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=724, Invalid=1928, Unknown=0, NotChecked=0, Total=2652 [2022-03-18 00:45:47,549 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) [2022-03-18 00:45:48,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:48,259 INFO L93 Difference]: Finished difference Result 68 states and 72 transitions. [2022-03-18 00:45:48,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-18 00:45:48,260 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 [2022-03-18 00:45:48,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:48,260 INFO L225 Difference]: With dead ends: 68 [2022-03-18 00:45:48,260 INFO L226 Difference]: Without dead ends: 61 [2022-03-18 00:45:48,261 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1412, Invalid=4138, Unknown=0, NotChecked=0, Total=5550 [2022-03-18 00:45:48,262 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 31 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 1113 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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 [2022-03-18 00:45:48,262 INFO L913 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] [2022-03-18 00:45:48,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-03-18 00:45:48,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-03-18 00:45:48,267 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) [2022-03-18 00:45:48,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2022-03-18 00:45:48,267 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 57 [2022-03-18 00:45:48,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:48,267 INFO L478 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2022-03-18 00:45:48,267 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) [2022-03-18 00:45:48,267 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2022-03-18 00:45:48,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-18 00:45:48,268 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:48,268 INFO L500 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:48,284 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-03-18 00:45:48,478 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 [2022-03-18 00:45:48,478 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:48,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:48,478 INFO L85 PathProgramCache]: Analyzing trace with hash 1175455128, now seen corresponding path program 45 times [2022-03-18 00:45:48,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:48,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1880696315] [2022-03-18 00:45:48,590 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:48,590 INFO L85 PathProgramCache]: Analyzing trace with hash 56247409, now seen corresponding path program 1 times [2022-03-18 00:45:48,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:48,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901531747] [2022-03-18 00:45:48,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:48,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:48,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:48,594 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:48,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:48,598 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:48,598 INFO L85 PathProgramCache]: Analyzing trace with hash 1175455128, now seen corresponding path program 46 times [2022-03-18 00:45:48,598 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:48,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948975743] [2022-03-18 00:45:48,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:48,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:48,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:48,971 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:48,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:48,974 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 24 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:48,974 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:48,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948975743] [2022-03-18 00:45:48,974 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1948975743] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:48,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1398694821] [2022-03-18 00:45:48,974 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:45:48,974 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:48,975 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:48,976 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) [2022-03-18 00:45:48,977 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-18 00:45:49,036 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:45:49,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:49,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 50 conjunts are in the unsatisfiable core [2022-03-18 00:45:49,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:49,245 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 24 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:49,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:51,443 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 24 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:51,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1398694821] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:51,443 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:51,443 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 27] total 53 [2022-03-18 00:45:51,443 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:51,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1880696315] [2022-03-18 00:45:51,444 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1880696315] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:51,444 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:51,444 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-03-18 00:45:51,444 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198242716] [2022-03-18 00:45:51,444 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:51,445 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-03-18 00:45:51,445 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:51,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-03-18 00:45:51,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=753, Invalid=2003, Unknown=0, NotChecked=0, Total=2756 [2022-03-18 00:45:51,450 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) [2022-03-18 00:45:51,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:51,980 INFO L93 Difference]: Finished difference Result 70 states and 74 transitions. [2022-03-18 00:45:51,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-03-18 00:45:51,981 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 [2022-03-18 00:45:51,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:51,981 INFO L225 Difference]: With dead ends: 70 [2022-03-18 00:45:51,981 INFO L226 Difference]: Without dead ends: 63 [2022-03-18 00:45:51,982 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1495, Invalid=4357, Unknown=0, NotChecked=0, Total=5852 [2022-03-18 00:45:51,982 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 32 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 1090 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 1139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 1090 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:51,985 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 19 Invalid, 1139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 1090 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-18 00:45:51,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-03-18 00:45:51,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-03-18 00:45:51,990 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) [2022-03-18 00:45:51,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2022-03-18 00:45:51,992 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 59 [2022-03-18 00:45:51,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:51,992 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2022-03-18 00:45:51,992 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) [2022-03-18 00:45:51,992 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2022-03-18 00:45:51,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-03-18 00:45:51,993 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:51,993 INFO L500 BasicCegarLoop]: trace histogram [25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:52,011 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-03-18 00:45:52,207 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 [2022-03-18 00:45:52,208 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:52,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:52,208 INFO L85 PathProgramCache]: Analyzing trace with hash 1977916213, now seen corresponding path program 47 times [2022-03-18 00:45:52,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:52,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2114906719] [2022-03-18 00:45:52,350 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:52,350 INFO L85 PathProgramCache]: Analyzing trace with hash 115352753, now seen corresponding path program 1 times [2022-03-18 00:45:52,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:52,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1726200127] [2022-03-18 00:45:52,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:52,351 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:52,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:52,354 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:52,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:52,362 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:52,362 INFO L85 PathProgramCache]: Analyzing trace with hash 1977916213, now seen corresponding path program 48 times [2022-03-18 00:45:52,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:52,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147463487] [2022-03-18 00:45:52,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:52,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:52,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:52,757 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:52,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:52,759 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 25 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:52,759 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:52,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1147463487] [2022-03-18 00:45:52,760 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1147463487] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:52,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [608571343] [2022-03-18 00:45:52,760 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:45:52,760 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:52,760 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:52,761 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) [2022-03-18 00:45:52,762 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-18 00:45:52,801 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-18 00:45:52,801 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:52,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-18 00:45:52,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:52,996 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 72 proven. 1 refuted. 0 times theorem prover too weak. 552 trivial. 0 not checked. [2022-03-18 00:45:52,999 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:53,277 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 72 proven. 1 refuted. 0 times theorem prover too weak. 552 trivial. 0 not checked. [2022-03-18 00:45:53,278 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [608571343] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:53,278 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:53,278 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 4, 8] total 36 [2022-03-18 00:45:53,279 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:53,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2114906719] [2022-03-18 00:45:53,279 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2114906719] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:53,279 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:53,279 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-03-18 00:45:53,279 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240081347] [2022-03-18 00:45:53,279 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:53,280 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-03-18 00:45:53,280 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:53,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-03-18 00:45:53,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=1060, Unknown=0, NotChecked=0, Total=1260 [2022-03-18 00:45:53,282 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) [2022-03-18 00:45:54,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:54,078 INFO L93 Difference]: Finished difference Result 72 states and 76 transitions. [2022-03-18 00:45:54,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-18 00:45:54,078 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 [2022-03-18 00:45:54,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:54,079 INFO L225 Difference]: With dead ends: 72 [2022-03-18 00:45:54,079 INFO L226 Difference]: Without dead ends: 65 [2022-03-18 00:45:54,080 INFO L911 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 [2022-03-18 00:45:54,082 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 33 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 1311 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 1362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 1311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:54,082 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 124 Invalid, 1362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 1311 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-18 00:45:54,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-03-18 00:45:54,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-03-18 00:45:54,090 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) [2022-03-18 00:45:54,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2022-03-18 00:45:54,090 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 61 [2022-03-18 00:45:54,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:54,091 INFO L478 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2022-03-18 00:45:54,091 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) [2022-03-18 00:45:54,091 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2022-03-18 00:45:54,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-03-18 00:45:54,091 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:54,091 INFO L500 BasicCegarLoop]: trace histogram [26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:54,110 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-03-18 00:45:54,308 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 [2022-03-18 00:45:54,308 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:54,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:54,308 INFO L85 PathProgramCache]: Analyzing trace with hash 48905618, now seen corresponding path program 49 times [2022-03-18 00:45:54,308 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:54,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [467414809] [2022-03-18 00:45:54,432 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:54,432 INFO L85 PathProgramCache]: Analyzing trace with hash 174458097, now seen corresponding path program 1 times [2022-03-18 00:45:54,432 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:54,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345277727] [2022-03-18 00:45:54,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:54,432 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:54,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:54,436 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:54,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:54,440 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:54,440 INFO L85 PathProgramCache]: Analyzing trace with hash 48905618, now seen corresponding path program 50 times [2022-03-18 00:45:54,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:54,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1659409793] [2022-03-18 00:45:54,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:54,440 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:54,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:54,853 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:54,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:54,855 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 26 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:54,856 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:54,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1659409793] [2022-03-18 00:45:54,856 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1659409793] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:54,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [325467925] [2022-03-18 00:45:54,856 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:45:54,856 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:54,856 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:54,857 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) [2022-03-18 00:45:54,858 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-18 00:45:54,909 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:45:54,909 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:54,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 55 conjunts are in the unsatisfiable core [2022-03-18 00:45:54,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:55,133 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:55,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:45:57,943 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:57,943 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [325467925] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:45:57,943 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:45:57,943 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 58 [2022-03-18 00:45:57,943 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:45:57,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [467414809] [2022-03-18 00:45:57,944 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [467414809] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:45:57,944 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:45:57,944 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-18 00:45:57,944 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200087168] [2022-03-18 00:45:57,944 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:45:57,944 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-18 00:45:57,944 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:57,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-18 00:45:57,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=895, Invalid=2411, Unknown=0, NotChecked=0, Total=3306 [2022-03-18 00:45:57,945 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) [2022-03-18 00:45:58,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:45:58,804 INFO L93 Difference]: Finished difference Result 74 states and 78 transitions. [2022-03-18 00:45:58,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-18 00:45:58,804 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 [2022-03-18 00:45:58,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:45:58,805 INFO L225 Difference]: With dead ends: 74 [2022-03-18 00:45:58,805 INFO L226 Difference]: Without dead ends: 67 [2022-03-18 00:45:58,806 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 98 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1751, Invalid=5221, Unknown=0, NotChecked=0, Total=6972 [2022-03-18 00:45:58,806 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 34 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 1356 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 1409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 1356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-18 00:45:58,806 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 79 Invalid, 1409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 1356 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-18 00:45:58,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-03-18 00:45:58,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2022-03-18 00:45:58,812 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) [2022-03-18 00:45:58,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2022-03-18 00:45:58,812 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 63 [2022-03-18 00:45:58,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:45:58,812 INFO L478 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2022-03-18 00:45:58,812 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) [2022-03-18 00:45:58,812 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2022-03-18 00:45:58,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-03-18 00:45:58,812 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:45:58,813 INFO L500 BasicCegarLoop]: trace histogram [27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:45:58,829 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-03-18 00:45:59,018 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 [2022-03-18 00:45:59,019 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:45:59,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:45:59,019 INFO L85 PathProgramCache]: Analyzing trace with hash 1695595695, now seen corresponding path program 51 times [2022-03-18 00:45:59,019 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:45:59,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1113555922] [2022-03-18 00:45:59,112 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:45:59,112 INFO L85 PathProgramCache]: Analyzing trace with hash 233563441, now seen corresponding path program 1 times [2022-03-18 00:45:59,112 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:59,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1928213631] [2022-03-18 00:45:59,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:59,112 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:59,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:59,115 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:45:59,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:45:59,118 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:45:59,118 INFO L85 PathProgramCache]: Analyzing trace with hash 1695595695, now seen corresponding path program 52 times [2022-03-18 00:45:59,118 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:45:59,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2082825907] [2022-03-18 00:45:59,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:45:59,119 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:45:59,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:59,574 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:45:59,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:45:59,576 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 27 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:59,577 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:45:59,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2082825907] [2022-03-18 00:45:59,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2082825907] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:45:59,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1133953300] [2022-03-18 00:45:59,577 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:45:59,577 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:45:59,577 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:45:59,584 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) [2022-03-18 00:45:59,585 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-18 00:45:59,648 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:45:59,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:45:59,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 57 conjunts are in the unsatisfiable core [2022-03-18 00:45:59,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:45:59,903 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:45:59,903 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:46:03,326 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:03,327 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1133953300] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:46:03,327 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:46:03,327 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 60 [2022-03-18 00:46:03,327 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:46:03,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1113555922] [2022-03-18 00:46:03,327 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1113555922] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:46:03,327 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:46:03,327 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-18 00:46:03,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12029162] [2022-03-18 00:46:03,327 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:46:03,327 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-18 00:46:03,327 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:46:03,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-18 00:46:03,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=956, Invalid=2584, Unknown=0, NotChecked=0, Total=3540 [2022-03-18 00:46:03,328 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) [2022-03-18 00:46:04,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:46:04,252 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2022-03-18 00:46:04,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-03-18 00:46:04,252 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 [2022-03-18 00:46:04,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:46:04,253 INFO L225 Difference]: With dead ends: 76 [2022-03-18 00:46:04,253 INFO L226 Difference]: Without dead ends: 69 [2022-03-18 00:46:04,254 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 413 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=1872, Invalid=5610, Unknown=0, NotChecked=0, Total=7482 [2022-03-18 00:46:04,254 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 35 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 1483 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 1538 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 1483 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-18 00:46:04,254 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 99 Invalid, 1538 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 1483 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-18 00:46:04,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-03-18 00:46:04,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2022-03-18 00:46:04,268 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) [2022-03-18 00:46:04,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2022-03-18 00:46:04,268 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 65 [2022-03-18 00:46:04,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:46:04,268 INFO L478 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2022-03-18 00:46:04,268 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) [2022-03-18 00:46:04,268 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2022-03-18 00:46:04,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-03-18 00:46:04,269 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:46:04,269 INFO L500 BasicCegarLoop]: trace histogram [28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:46:04,286 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-03-18 00:46:04,485 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 [2022-03-18 00:46:04,485 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:46:04,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:46:04,486 INFO L85 PathProgramCache]: Analyzing trace with hash -678172532, now seen corresponding path program 53 times [2022-03-18 00:46:04,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:46:04,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1543837857] [2022-03-18 00:46:04,610 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:46:04,611 INFO L85 PathProgramCache]: Analyzing trace with hash 292668785, now seen corresponding path program 1 times [2022-03-18 00:46:04,611 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:46:04,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1939480556] [2022-03-18 00:46:04,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:46:04,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:46:04,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:46:04,615 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:46:04,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:46:04,618 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:46:04,618 INFO L85 PathProgramCache]: Analyzing trace with hash -678172532, now seen corresponding path program 54 times [2022-03-18 00:46:04,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:46:04,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1547849195] [2022-03-18 00:46:04,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:46:04,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:46:04,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:46:05,087 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:46:05,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:46:05,090 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 28 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:05,090 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:46:05,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1547849195] [2022-03-18 00:46:05,090 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1547849195] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:46:05,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [532850636] [2022-03-18 00:46:05,090 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:46:05,090 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:46:05,090 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:46:05,095 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) [2022-03-18 00:46:05,097 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-18 00:46:05,147 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-18 00:46:05,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:46:05,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-18 00:46:05,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:46:05,394 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 81 proven. 1 refuted. 0 times theorem prover too weak. 702 trivial. 0 not checked. [2022-03-18 00:46:05,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:46:05,799 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 81 proven. 1 refuted. 0 times theorem prover too weak. 702 trivial. 0 not checked. [2022-03-18 00:46:05,799 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [532850636] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:46:05,799 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:46:05,799 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 4, 8] total 39 [2022-03-18 00:46:05,800 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:46:05,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1543837857] [2022-03-18 00:46:05,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1543837857] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:46:05,800 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:46:05,800 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-03-18 00:46:05,800 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918628538] [2022-03-18 00:46:05,800 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:46:05,800 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-03-18 00:46:05,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:46:05,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-03-18 00:46:05,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=1261, Unknown=0, NotChecked=0, Total=1482 [2022-03-18 00:46:05,801 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) [2022-03-18 00:46:06,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:46:06,623 INFO L93 Difference]: Finished difference Result 78 states and 82 transitions. [2022-03-18 00:46:06,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-03-18 00:46:06,623 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 [2022-03-18 00:46:06,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:46:06,624 INFO L225 Difference]: With dead ends: 78 [2022-03-18 00:46:06,624 INFO L226 Difference]: Without dead ends: 71 [2022-03-18 00:46:06,624 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 128 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=497, Invalid=3925, Unknown=0, NotChecked=0, Total=4422 [2022-03-18 00:46:06,624 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 36 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 1494 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 1551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 1494 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-18 00:46:06,625 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 19 Invalid, 1551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 1494 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-18 00:46:06,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-03-18 00:46:06,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2022-03-18 00:46:06,630 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) [2022-03-18 00:46:06,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2022-03-18 00:46:06,630 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 67 [2022-03-18 00:46:06,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:46:06,631 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2022-03-18 00:46:06,631 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) [2022-03-18 00:46:06,631 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2022-03-18 00:46:06,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-03-18 00:46:06,631 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:46:06,631 INFO L500 BasicCegarLoop]: trace histogram [29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:46:06,637 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-03-18 00:46:06,835 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 [2022-03-18 00:46:06,835 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:46:06,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:46:06,836 INFO L85 PathProgramCache]: Analyzing trace with hash -1241804503, now seen corresponding path program 55 times [2022-03-18 00:46:06,836 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:46:06,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [321822950] [2022-03-18 00:46:06,963 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:46:06,963 INFO L85 PathProgramCache]: Analyzing trace with hash 351774129, now seen corresponding path program 1 times [2022-03-18 00:46:06,963 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:46:06,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344908010] [2022-03-18 00:46:06,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:46:06,964 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:46:06,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:46:06,967 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:46:06,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:46:06,970 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:46:06,970 INFO L85 PathProgramCache]: Analyzing trace with hash -1241804503, now seen corresponding path program 56 times [2022-03-18 00:46:06,970 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:46:06,970 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933617712] [2022-03-18 00:46:06,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:46:06,971 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:46:06,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:46:07,480 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:46:07,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:46:07,482 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 29 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:07,483 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:46:07,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933617712] [2022-03-18 00:46:07,483 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [933617712] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:46:07,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [915226905] [2022-03-18 00:46:07,483 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:46:07,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:46:07,483 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:46:07,493 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) [2022-03-18 00:46:07,495 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-18 00:46:07,563 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:46:07,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:46:07,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 61 conjunts are in the unsatisfiable core [2022-03-18 00:46:07,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:46:07,842 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:07,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:46:12,328 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:12,328 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [915226905] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:46:12,328 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:46:12,328 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 64 [2022-03-18 00:46:12,328 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:46:12,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [321822950] [2022-03-18 00:46:12,328 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [321822950] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:46:12,328 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:46:12,329 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-03-18 00:46:12,329 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914517016] [2022-03-18 00:46:12,329 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:46:12,329 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-03-18 00:46:12,329 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:46:12,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-03-18 00:46:12,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1084, Invalid=2948, Unknown=0, NotChecked=0, Total=4032 [2022-03-18 00:46:12,330 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) [2022-03-18 00:46:13,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:46:13,407 INFO L93 Difference]: Finished difference Result 80 states and 84 transitions. [2022-03-18 00:46:13,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-03-18 00:46:13,407 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 [2022-03-18 00:46:13,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:46:13,407 INFO L225 Difference]: With dead ends: 80 [2022-03-18 00:46:13,407 INFO L226 Difference]: Without dead ends: 73 [2022-03-18 00:46:13,409 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 107 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=2126, Invalid=6430, Unknown=0, NotChecked=0, Total=8556 [2022-03-18 00:46:13,409 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 37 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 1689 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 1748 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 1689 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-18 00:46:13,409 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 89 Invalid, 1748 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 1689 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-18 00:46:13,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-03-18 00:46:13,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2022-03-18 00:46:13,415 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) [2022-03-18 00:46:13,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2022-03-18 00:46:13,415 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 69 [2022-03-18 00:46:13,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:46:13,415 INFO L478 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2022-03-18 00:46:13,415 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) [2022-03-18 00:46:13,415 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2022-03-18 00:46:13,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-03-18 00:46:13,415 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:46:13,415 INFO L500 BasicCegarLoop]: trace histogram [30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:46:13,434 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-03-18 00:46:13,627 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 [2022-03-18 00:46:13,627 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:46:13,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:46:13,627 INFO L85 PathProgramCache]: Analyzing trace with hash -1726249338, now seen corresponding path program 57 times [2022-03-18 00:46:13,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:46:13,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [271062704] [2022-03-18 00:46:13,763 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:46:13,764 INFO L85 PathProgramCache]: Analyzing trace with hash 410879473, now seen corresponding path program 1 times [2022-03-18 00:46:13,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:46:13,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541226591] [2022-03-18 00:46:13,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:46:13,764 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:46:13,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:46:13,767 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:46:13,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:46:13,770 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:46:13,770 INFO L85 PathProgramCache]: Analyzing trace with hash -1726249338, now seen corresponding path program 58 times [2022-03-18 00:46:13,770 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:46:13,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499573980] [2022-03-18 00:46:13,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:46:13,770 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:46:13,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:46:14,290 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:46:14,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:46:14,294 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 30 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:14,294 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:46:14,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499573980] [2022-03-18 00:46:14,294 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499573980] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:46:14,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [177017938] [2022-03-18 00:46:14,294 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:46:14,294 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:46:14,294 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:46:14,295 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) [2022-03-18 00:46:14,296 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-18 00:46:14,371 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:46:14,371 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:46:14,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 63 conjunts are in the unsatisfiable core [2022-03-18 00:46:14,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:46:14,667 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:14,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:46:20,024 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:20,024 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [177017938] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:46:20,025 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:46:20,025 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 66 [2022-03-18 00:46:20,025 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:46:20,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [271062704] [2022-03-18 00:46:20,025 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [271062704] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:46:20,025 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:46:20,025 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-03-18 00:46:20,025 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173537586] [2022-03-18 00:46:20,025 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:46:20,025 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-03-18 00:46:20,025 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:46:20,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-03-18 00:46:20,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1151, Invalid=3139, Unknown=0, NotChecked=0, Total=4290 [2022-03-18 00:46:20,026 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) [2022-03-18 00:46:21,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:46:21,143 INFO L93 Difference]: Finished difference Result 82 states and 86 transitions. [2022-03-18 00:46:21,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-03-18 00:46:21,143 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 [2022-03-18 00:46:21,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:46:21,144 INFO L225 Difference]: With dead ends: 82 [2022-03-18 00:46:21,144 INFO L226 Difference]: Without dead ends: 75 [2022-03-18 00:46:21,148 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 110 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 503 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=2259, Invalid=6861, Unknown=0, NotChecked=0, Total=9120 [2022-03-18 00:46:21,148 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 38 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 1828 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 1889 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 1828 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-18 00:46:21,148 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 109 Invalid, 1889 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 1828 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-18 00:46:21,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-03-18 00:46:21,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-03-18 00:46:21,157 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) [2022-03-18 00:46:21,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2022-03-18 00:46:21,158 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 71 [2022-03-18 00:46:21,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:46:21,158 INFO L478 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2022-03-18 00:46:21,159 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) [2022-03-18 00:46:21,159 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2022-03-18 00:46:21,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-03-18 00:46:21,159 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:46:21,159 INFO L500 BasicCegarLoop]: trace histogram [31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:46:21,176 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-03-18 00:46:21,364 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 [2022-03-18 00:46:21,364 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:46:21,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:46:21,364 INFO L85 PathProgramCache]: Analyzing trace with hash 873699491, now seen corresponding path program 59 times [2022-03-18 00:46:21,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:46:21,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [830908852] [2022-03-18 00:46:21,499 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:46:21,499 INFO L85 PathProgramCache]: Analyzing trace with hash 469984817, now seen corresponding path program 1 times [2022-03-18 00:46:21,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:46:21,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [971926504] [2022-03-18 00:46:21,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:46:21,500 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:46:21,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:46:21,503 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:46:21,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:46:21,506 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:46:21,506 INFO L85 PathProgramCache]: Analyzing trace with hash 873699491, now seen corresponding path program 60 times [2022-03-18 00:46:21,506 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:46:21,507 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [132255838] [2022-03-18 00:46:21,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:46:21,507 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:46:21,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:46:22,061 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:46:22,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:46:22,064 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 31 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:22,064 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:46:22,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [132255838] [2022-03-18 00:46:22,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [132255838] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:46:22,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689391113] [2022-03-18 00:46:22,065 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:46:22,065 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:46:22,065 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:46:22,066 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) [2022-03-18 00:46:22,067 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-03-18 00:46:22,125 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-18 00:46:22,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:46:22,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-18 00:46:22,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:46:22,489 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 90 proven. 1 refuted. 0 times theorem prover too weak. 870 trivial. 0 not checked. [2022-03-18 00:46:22,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:46:23,022 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 90 proven. 1 refuted. 0 times theorem prover too weak. 870 trivial. 0 not checked. [2022-03-18 00:46:23,023 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689391113] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:46:23,023 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:46:23,023 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 4, 8] total 42 [2022-03-18 00:46:23,023 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:46:23,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [830908852] [2022-03-18 00:46:23,023 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [830908852] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:46:23,023 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:46:23,023 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-03-18 00:46:23,023 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036573494] [2022-03-18 00:46:23,023 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:46:23,023 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-03-18 00:46:23,023 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:46:23,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-03-18 00:46:23,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=1480, Unknown=0, NotChecked=0, Total=1722 [2022-03-18 00:46:23,024 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) [2022-03-18 00:46:24,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:46:24,204 INFO L93 Difference]: Finished difference Result 84 states and 88 transitions. [2022-03-18 00:46:24,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-03-18 00:46:24,204 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 [2022-03-18 00:46:24,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:46:24,205 INFO L225 Difference]: With dead ends: 84 [2022-03-18 00:46:24,205 INFO L226 Difference]: Without dead ends: 77 [2022-03-18 00:46:24,205 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 140 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 476 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=548, Invalid=4708, Unknown=0, NotChecked=0, Total=5256 [2022-03-18 00:46:24,206 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 39 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 1971 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 2034 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 1971 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-18 00:46:24,206 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 129 Invalid, 2034 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 1971 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-18 00:46:24,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-03-18 00:46:24,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2022-03-18 00:46:24,212 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) [2022-03-18 00:46:24,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2022-03-18 00:46:24,212 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 73 [2022-03-18 00:46:24,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:46:24,213 INFO L478 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2022-03-18 00:46:24,213 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) [2022-03-18 00:46:24,213 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2022-03-18 00:46:24,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-03-18 00:46:24,213 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:46:24,213 INFO L500 BasicCegarLoop]: trace histogram [32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:46:24,219 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-03-18 00:46:24,417 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 [2022-03-18 00:46:24,417 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:46:24,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:46:24,417 INFO L85 PathProgramCache]: Analyzing trace with hash -246442112, now seen corresponding path program 61 times [2022-03-18 00:46:24,418 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:46:24,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [385198592] [2022-03-18 00:46:24,568 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:46:24,569 INFO L85 PathProgramCache]: Analyzing trace with hash 529090161, now seen corresponding path program 1 times [2022-03-18 00:46:24,569 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:46:24,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1357965871] [2022-03-18 00:46:24,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:46:24,569 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:46:24,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:46:24,572 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:46:24,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:46:24,575 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:46:24,575 INFO L85 PathProgramCache]: Analyzing trace with hash -246442112, now seen corresponding path program 62 times [2022-03-18 00:46:24,575 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:46:24,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [314499902] [2022-03-18 00:46:24,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:46:24,575 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:46:24,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:46:25,154 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:46:25,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:46:25,157 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 32 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:25,157 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:46:25,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [314499902] [2022-03-18 00:46:25,157 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [314499902] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:46:25,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [563252503] [2022-03-18 00:46:25,158 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:46:25,158 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:46:25,158 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:46:25,159 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) [2022-03-18 00:46:25,160 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-03-18 00:46:25,227 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:46:25,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:46:25,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 67 conjunts are in the unsatisfiable core [2022-03-18 00:46:25,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:46:25,529 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:25,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:46:32,765 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:32,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [563252503] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:46:32,765 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:46:32,765 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 70 [2022-03-18 00:46:32,766 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:46:32,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [385198592] [2022-03-18 00:46:32,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [385198592] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:46:32,766 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:46:32,766 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-03-18 00:46:32,766 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171088251] [2022-03-18 00:46:32,766 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:46:32,766 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-03-18 00:46:32,766 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:46:32,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-03-18 00:46:32,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1291, Invalid=3539, Unknown=0, NotChecked=0, Total=4830 [2022-03-18 00:46:32,767 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) [2022-03-18 00:46:34,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:46:34,042 INFO L93 Difference]: Finished difference Result 86 states and 90 transitions. [2022-03-18 00:46:34,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-03-18 00:46:34,042 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 [2022-03-18 00:46:34,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:46:34,043 INFO L225 Difference]: With dead ends: 86 [2022-03-18 00:46:34,043 INFO L226 Difference]: Without dead ends: 79 [2022-03-18 00:46:34,044 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 568 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=2537, Invalid=7765, Unknown=0, NotChecked=0, Total=10302 [2022-03-18 00:46:34,044 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 40 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 2028 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 2093 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 2028 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-18 00:46:34,044 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 74 Invalid, 2093 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 2028 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-18 00:46:34,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-03-18 00:46:34,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2022-03-18 00:46:34,050 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) [2022-03-18 00:46:34,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2022-03-18 00:46:34,051 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 75 [2022-03-18 00:46:34,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:46:34,051 INFO L478 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2022-03-18 00:46:34,051 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) [2022-03-18 00:46:34,051 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2022-03-18 00:46:34,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-03-18 00:46:34,051 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:46:34,051 INFO L500 BasicCegarLoop]: trace histogram [33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:46:34,070 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-03-18 00:46:34,252 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 [2022-03-18 00:46:34,252 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:46:34,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:46:34,253 INFO L85 PathProgramCache]: Analyzing trace with hash 1334268701, now seen corresponding path program 63 times [2022-03-18 00:46:34,253 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:46:34,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1636593326] [2022-03-18 00:46:34,375 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:46:34,376 INFO L85 PathProgramCache]: Analyzing trace with hash 588195505, now seen corresponding path program 1 times [2022-03-18 00:46:34,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:46:34,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2095185789] [2022-03-18 00:46:34,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:46:34,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:46:34,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:46:34,380 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:46:34,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:46:34,383 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:46:34,383 INFO L85 PathProgramCache]: Analyzing trace with hash 1334268701, now seen corresponding path program 64 times [2022-03-18 00:46:34,383 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:46:34,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611466432] [2022-03-18 00:46:34,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:46:34,383 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:46:34,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:46:35,033 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:46:35,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:46:35,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 33 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:35,039 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:46:35,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611466432] [2022-03-18 00:46:35,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [611466432] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:46:35,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1733801272] [2022-03-18 00:46:35,039 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:46:35,039 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:46:35,039 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:46:35,040 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) [2022-03-18 00:46:35,041 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-03-18 00:46:35,100 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:46:35,100 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:46:35,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 68 conjunts are in the unsatisfiable core [2022-03-18 00:46:35,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:46:35,340 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 33 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:35,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:46:42,353 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 33 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:42,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1733801272] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:46:42,353 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:46:42,353 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 36] total 71 [2022-03-18 00:46:42,354 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:46:42,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1636593326] [2022-03-18 00:46:42,354 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1636593326] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:46:42,354 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:46:42,354 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-03-18 00:46:42,354 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244509711] [2022-03-18 00:46:42,354 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:46:42,354 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-03-18 00:46:42,354 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:46:42,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-03-18 00:46:42,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1329, Invalid=3641, Unknown=0, NotChecked=0, Total=4970 [2022-03-18 00:46:42,355 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) [2022-03-18 00:46:43,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:46:43,676 INFO L93 Difference]: Finished difference Result 88 states and 92 transitions. [2022-03-18 00:46:43,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-03-18 00:46:43,676 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 [2022-03-18 00:46:43,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:46:43,677 INFO L225 Difference]: With dead ends: 88 [2022-03-18 00:46:43,677 INFO L226 Difference]: Without dead ends: 81 [2022-03-18 00:46:43,678 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 120 SyntacticMatches, 2 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 632 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=2647, Invalid=8065, Unknown=0, NotChecked=0, Total=10712 [2022-03-18 00:46:43,678 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 41 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 2275 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 2342 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 2275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-18 00:46:43,678 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 174 Invalid, 2342 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 2275 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-18 00:46:43,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-03-18 00:46:43,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2022-03-18 00:46:43,685 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) [2022-03-18 00:46:43,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2022-03-18 00:46:43,685 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 77 [2022-03-18 00:46:43,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:46:43,685 INFO L478 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2022-03-18 00:46:43,685 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) [2022-03-18 00:46:43,686 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2022-03-18 00:46:43,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-03-18 00:46:43,686 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:46:43,686 INFO L500 BasicCegarLoop]: trace histogram [34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:46:43,705 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-03-18 00:46:43,903 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 [2022-03-18 00:46:43,903 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:46:43,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:46:43,904 INFO L85 PathProgramCache]: Analyzing trace with hash -21062790, now seen corresponding path program 65 times [2022-03-18 00:46:43,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:46:43,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1425992115] [2022-03-18 00:46:44,058 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:46:44,058 INFO L85 PathProgramCache]: Analyzing trace with hash 647300849, now seen corresponding path program 1 times [2022-03-18 00:46:44,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:46:44,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2095397500] [2022-03-18 00:46:44,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:46:44,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:46:44,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:46:44,062 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:46:44,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:46:44,065 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:46:44,065 INFO L85 PathProgramCache]: Analyzing trace with hash -21062790, now seen corresponding path program 66 times [2022-03-18 00:46:44,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:46:44,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996582199] [2022-03-18 00:46:44,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:46:44,066 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:46:44,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:46:44,734 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:46:44,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:46:44,737 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 34 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:44,738 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:46:44,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996582199] [2022-03-18 00:46:44,738 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996582199] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:46:44,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [559938617] [2022-03-18 00:46:44,738 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:46:44,738 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:46:44,738 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:46:44,740 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) [2022-03-18 00:46:44,741 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-03-18 00:46:44,772 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-18 00:46:44,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:46:44,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-18 00:46:44,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:46:45,229 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 99 proven. 1 refuted. 0 times theorem prover too weak. 1056 trivial. 0 not checked. [2022-03-18 00:46:45,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:46:45,993 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 99 proven. 1 refuted. 0 times theorem prover too weak. 1056 trivial. 0 not checked. [2022-03-18 00:46:45,994 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [559938617] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:46:45,994 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:46:45,994 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 4, 8] total 45 [2022-03-18 00:46:45,994 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:46:45,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1425992115] [2022-03-18 00:46:45,994 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1425992115] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:46:45,994 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:46:45,994 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-03-18 00:46:45,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498064580] [2022-03-18 00:46:45,994 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:46:45,995 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-03-18 00:46:45,995 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:46:45,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-03-18 00:46:45,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1717, Unknown=0, NotChecked=0, Total=1980 [2022-03-18 00:46:45,995 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) [2022-03-18 00:46:47,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:46:47,315 INFO L93 Difference]: Finished difference Result 90 states and 94 transitions. [2022-03-18 00:46:47,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-03-18 00:46:47,316 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 [2022-03-18 00:46:47,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:46:47,316 INFO L225 Difference]: With dead ends: 90 [2022-03-18 00:46:47,316 INFO L226 Difference]: Without dead ends: 83 [2022-03-18 00:46:47,317 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 152 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 572 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=599, Invalid=5563, Unknown=0, NotChecked=0, Total=6162 [2022-03-18 00:46:47,317 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 42 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 2238 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 2307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 2238 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-18 00:46:47,317 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 34 Invalid, 2307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 2238 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-18 00:46:47,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-03-18 00:46:47,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2022-03-18 00:46:47,323 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) [2022-03-18 00:46:47,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2022-03-18 00:46:47,323 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 79 [2022-03-18 00:46:47,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:46:47,324 INFO L478 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2022-03-18 00:46:47,324 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) [2022-03-18 00:46:47,324 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2022-03-18 00:46:47,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-03-18 00:46:47,324 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:46:47,324 INFO L500 BasicCegarLoop]: trace histogram [35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:46:47,341 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2022-03-18 00:46:47,533 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 [2022-03-18 00:46:47,534 INFO L403 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:46:47,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:46:47,534 INFO L85 PathProgramCache]: Analyzing trace with hash -1119534953, now seen corresponding path program 67 times [2022-03-18 00:46:47,534 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:46:47,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [972021017] [2022-03-18 00:46:47,628 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:46:47,629 INFO L85 PathProgramCache]: Analyzing trace with hash 706406193, now seen corresponding path program 1 times [2022-03-18 00:46:47,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:46:47,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1728984835] [2022-03-18 00:46:47,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:46:47,629 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:46:47,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:46:47,650 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:46:47,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:46:47,658 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:46:47,659 INFO L85 PathProgramCache]: Analyzing trace with hash -1119534953, now seen corresponding path program 68 times [2022-03-18 00:46:47,659 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:46:47,659 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1848577005] [2022-03-18 00:46:47,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:46:47,659 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:46:47,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:46:48,132 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:46:48,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:46:48,134 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 35 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:48,134 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:46:48,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1848577005] [2022-03-18 00:46:48,135 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1848577005] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:46:48,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [476973292] [2022-03-18 00:46:48,135 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:46:48,135 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:46:48,135 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:46:48,136 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) [2022-03-18 00:46:48,136 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-03-18 00:46:48,233 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:46:48,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:46:48,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 76 conjunts are in the unsatisfiable core [2022-03-18 00:46:48,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:46:48,404 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:48,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:46:54,265 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:54,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [476973292] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:46:54,266 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:46:54,266 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 41] total 79 [2022-03-18 00:46:54,266 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:46:54,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [972021017] [2022-03-18 00:46:54,266 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [972021017] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:46:54,266 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:46:54,266 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-03-18 00:46:54,266 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448269941] [2022-03-18 00:46:54,266 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:46:54,266 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-03-18 00:46:54,266 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:46:54,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-03-18 00:46:54,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1523, Invalid=4639, Unknown=0, NotChecked=0, Total=6162 [2022-03-18 00:46:54,267 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) [2022-03-18 00:46:56,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:46:56,022 INFO L93 Difference]: Finished difference Result 92 states and 96 transitions. [2022-03-18 00:46:56,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-03-18 00:46:56,023 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 [2022-03-18 00:46:56,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:46:56,023 INFO L225 Difference]: With dead ends: 92 [2022-03-18 00:46:56,023 INFO L226 Difference]: Without dead ends: 85 [2022-03-18 00:46:56,024 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 122 SyntacticMatches, 2 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 714 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=2991, Invalid=9891, Unknown=0, NotChecked=0, Total=12882 [2022-03-18 00:46:56,025 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 43 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 2487 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 2558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 2487 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-03-18 00:46:56,025 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 129 Invalid, 2558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 2487 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-03-18 00:46:56,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-03-18 00:46:56,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2022-03-18 00:46:56,032 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) [2022-03-18 00:46:56,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2022-03-18 00:46:56,032 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 81 [2022-03-18 00:46:56,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:46:56,032 INFO L478 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2022-03-18 00:46:56,032 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) [2022-03-18 00:46:56,032 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2022-03-18 00:46:56,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-03-18 00:46:56,033 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:46:56,033 INFO L500 BasicCegarLoop]: trace histogram [36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:46:56,052 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-03-18 00:46:56,249 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 [2022-03-18 00:46:56,250 INFO L403 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:46:56,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:46:56,250 INFO L85 PathProgramCache]: Analyzing trace with hash -189328780, now seen corresponding path program 69 times [2022-03-18 00:46:56,250 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:46:56,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [971511393] [2022-03-18 00:46:56,371 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:46:56,371 INFO L85 PathProgramCache]: Analyzing trace with hash 765511537, now seen corresponding path program 1 times [2022-03-18 00:46:56,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:46:56,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761672676] [2022-03-18 00:46:56,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:46:56,372 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:46:56,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:46:56,375 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:46:56,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:46:56,378 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:46:56,378 INFO L85 PathProgramCache]: Analyzing trace with hash -189328780, now seen corresponding path program 70 times [2022-03-18 00:46:56,378 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:46:56,378 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1856140976] [2022-03-18 00:46:56,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:46:56,378 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:46:56,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:46:57,128 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:46:57,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:46:57,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 36 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:57,132 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:46:57,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1856140976] [2022-03-18 00:46:57,132 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1856140976] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:46:57,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1929936478] [2022-03-18 00:46:57,132 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:46:57,132 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:46:57,132 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:46:57,133 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) [2022-03-18 00:46:57,134 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-03-18 00:46:57,212 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:46:57,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:46:57,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 74 conjunts are in the unsatisfiable core [2022-03-18 00:46:57,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:46:57,506 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 36 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:46:57,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:47:07,955 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 36 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:47:07,955 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1929936478] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:47:07,955 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:47:07,955 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 39] total 77 [2022-03-18 00:47:07,955 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:47:07,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [971511393] [2022-03-18 00:47:07,955 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [971511393] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:47:07,955 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:47:07,955 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-03-18 00:47:07,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175536175] [2022-03-18 00:47:07,956 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:47:07,956 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-03-18 00:47:07,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:47:07,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-03-18 00:47:07,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1557, Invalid=4295, Unknown=0, NotChecked=0, Total=5852 [2022-03-18 00:47:07,956 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) [2022-03-18 00:47:09,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:47:09,263 INFO L93 Difference]: Finished difference Result 94 states and 98 transitions. [2022-03-18 00:47:09,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-03-18 00:47:09,263 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 [2022-03-18 00:47:09,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:47:09,264 INFO L225 Difference]: With dead ends: 94 [2022-03-18 00:47:09,264 INFO L226 Difference]: Without dead ends: 87 [2022-03-18 00:47:09,265 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 743 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=3103, Invalid=9553, Unknown=0, NotChecked=0, Total=12656 [2022-03-18 00:47:09,265 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 44 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 2602 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 2675 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 2602 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-18 00:47:09,266 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 109 Invalid, 2675 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 2602 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-18 00:47:09,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-03-18 00:47:09,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2022-03-18 00:47:09,273 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) [2022-03-18 00:47:09,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2022-03-18 00:47:09,273 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 83 [2022-03-18 00:47:09,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:47:09,274 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2022-03-18 00:47:09,274 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) [2022-03-18 00:47:09,274 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2022-03-18 00:47:09,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-03-18 00:47:09,274 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:47:09,274 INFO L500 BasicCegarLoop]: trace histogram [37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:47:09,291 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-03-18 00:47:09,487 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 [2022-03-18 00:47:09,488 INFO L403 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:47:09,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:47:09,488 INFO L85 PathProgramCache]: Analyzing trace with hash 385605905, now seen corresponding path program 71 times [2022-03-18 00:47:09,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:47:09,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1052673597] [2022-03-18 00:47:09,574 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:47:09,574 INFO L85 PathProgramCache]: Analyzing trace with hash 824616881, now seen corresponding path program 1 times [2022-03-18 00:47:09,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:47:09,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792306743] [2022-03-18 00:47:09,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:47:09,575 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:47:09,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:47:09,583 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:47:09,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:47:09,587 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:47:09,587 INFO L85 PathProgramCache]: Analyzing trace with hash 385605905, now seen corresponding path program 72 times [2022-03-18 00:47:09,587 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:47:09,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531957203] [2022-03-18 00:47:09,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:47:09,587 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:47:09,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:47:10,343 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:47:10,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:47:10,346 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 37 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:47:10,346 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:47:10,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531957203] [2022-03-18 00:47:10,346 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [531957203] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:47:10,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1228907219] [2022-03-18 00:47:10,346 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:47:10,346 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:47:10,346 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:47:10,368 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) [2022-03-18 00:47:10,384 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-03-18 00:47:10,418 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-18 00:47:10,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:47:10,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-18 00:47:10,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:47:10,971 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 108 proven. 1 refuted. 0 times theorem prover too weak. 1260 trivial. 0 not checked. [2022-03-18 00:47:10,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:47:11,834 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 108 proven. 1 refuted. 0 times theorem prover too weak. 1260 trivial. 0 not checked. [2022-03-18 00:47:11,835 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1228907219] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:47:11,835 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:47:11,835 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 4, 8] total 48 [2022-03-18 00:47:11,835 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:47:11,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1052673597] [2022-03-18 00:47:11,835 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1052673597] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:47:11,835 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:47:11,835 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-03-18 00:47:11,835 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451163168] [2022-03-18 00:47:11,835 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:47:11,836 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-03-18 00:47:11,836 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:47:11,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-03-18 00:47:11,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=1972, Unknown=0, NotChecked=0, Total=2256 [2022-03-18 00:47:11,836 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) [2022-03-18 00:47:13,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:47:13,838 INFO L93 Difference]: Finished difference Result 96 states and 100 transitions. [2022-03-18 00:47:13,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-03-18 00:47:13,839 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 [2022-03-18 00:47:13,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:47:13,839 INFO L225 Difference]: With dead ends: 96 [2022-03-18 00:47:13,839 INFO L226 Difference]: Without dead ends: 89 [2022-03-18 00:47:13,840 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 164 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 677 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=650, Invalid=6490, Unknown=0, NotChecked=0, Total=7140 [2022-03-18 00:47:13,840 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 45 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 2655 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 2730 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 2655 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-18 00:47:13,840 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 34 Invalid, 2730 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 2655 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-18 00:47:13,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-03-18 00:47:13,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2022-03-18 00:47:13,847 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) [2022-03-18 00:47:13,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2022-03-18 00:47:13,847 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 85 [2022-03-18 00:47:13,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:47:13,847 INFO L478 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2022-03-18 00:47:13,847 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) [2022-03-18 00:47:13,847 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2022-03-18 00:47:13,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-03-18 00:47:13,847 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:47:13,848 INFO L500 BasicCegarLoop]: trace histogram [38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:47:13,864 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2022-03-18 00:47:14,051 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 [2022-03-18 00:47:14,051 INFO L403 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:47:14,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:47:14,052 INFO L85 PathProgramCache]: Analyzing trace with hash -1152942994, now seen corresponding path program 73 times [2022-03-18 00:47:14,052 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:47:14,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [137425837] [2022-03-18 00:47:14,168 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:47:14,169 INFO L85 PathProgramCache]: Analyzing trace with hash 883722225, now seen corresponding path program 1 times [2022-03-18 00:47:14,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:47:14,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142460837] [2022-03-18 00:47:14,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:47:14,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:47:14,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:47:14,174 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:47:14,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:47:14,188 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:47:14,188 INFO L85 PathProgramCache]: Analyzing trace with hash -1152942994, now seen corresponding path program 74 times [2022-03-18 00:47:14,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:47:14,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027322324] [2022-03-18 00:47:14,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:47:14,188 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:47:14,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:47:14,944 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:47:14,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:47:14,947 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 38 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:47:14,947 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:47:14,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1027322324] [2022-03-18 00:47:14,947 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1027322324] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:47:14,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [876914603] [2022-03-18 00:47:14,947 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:47:14,947 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:47:14,947 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:47:14,948 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) [2022-03-18 00:47:14,949 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-03-18 00:47:14,987 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:47:14,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:47:14,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 78 conjunts are in the unsatisfiable core [2022-03-18 00:47:14,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:47:15,170 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 38 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:47:15,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:47:27,730 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 38 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:47:27,730 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [876914603] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:47:27,730 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:47:27,730 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 41] total 81 [2022-03-18 00:47:27,730 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:47:27,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [137425837] [2022-03-18 00:47:27,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [137425837] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:47:27,731 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:47:27,731 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-03-18 00:47:27,731 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768580568] [2022-03-18 00:47:27,731 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:47:27,731 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-03-18 00:47:27,731 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:47:27,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-03-18 00:47:27,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1719, Invalid=4761, Unknown=0, NotChecked=0, Total=6480 [2022-03-18 00:47:27,732 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) [2022-03-18 00:47:29,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:47:29,508 INFO L93 Difference]: Finished difference Result 98 states and 102 transitions. [2022-03-18 00:47:29,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-03-18 00:47:29,508 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 [2022-03-18 00:47:29,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:47:29,508 INFO L225 Difference]: With dead ends: 98 [2022-03-18 00:47:29,508 INFO L226 Difference]: Without dead ends: 91 [2022-03-18 00:47:29,510 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 135 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 822 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=3427, Invalid=10615, Unknown=0, NotChecked=0, Total=14042 [2022-03-18 00:47:29,510 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 46 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 2988 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 3065 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 2988 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:47:29,510 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 189 Invalid, 3065 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 2988 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-03-18 00:47:29,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-03-18 00:47:29,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2022-03-18 00:47:29,517 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) [2022-03-18 00:47:29,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 93 transitions. [2022-03-18 00:47:29,517 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 93 transitions. Word has length 87 [2022-03-18 00:47:29,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:47:29,519 INFO L478 AbstractCegarLoop]: Abstraction has 91 states and 93 transitions. [2022-03-18 00:47:29,519 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) [2022-03-18 00:47:29,519 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 93 transitions. [2022-03-18 00:47:29,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-03-18 00:47:29,520 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:47:29,520 INFO L500 BasicCegarLoop]: trace histogram [39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:47:29,541 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2022-03-18 00:47:29,720 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 [2022-03-18 00:47:29,720 INFO L403 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:47:29,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:47:29,721 INFO L85 PathProgramCache]: Analyzing trace with hash 2065282187, now seen corresponding path program 75 times [2022-03-18 00:47:29,721 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:47:29,721 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [310359249] [2022-03-18 00:47:29,843 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:47:29,843 INFO L85 PathProgramCache]: Analyzing trace with hash 942827569, now seen corresponding path program 1 times [2022-03-18 00:47:29,843 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:47:29,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120365783] [2022-03-18 00:47:29,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:47:29,844 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:47:29,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:47:29,848 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:47:29,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:47:29,851 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:47:29,851 INFO L85 PathProgramCache]: Analyzing trace with hash 2065282187, now seen corresponding path program 76 times [2022-03-18 00:47:29,851 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:47:29,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504714024] [2022-03-18 00:47:29,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:47:29,851 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:47:29,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:47:30,677 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:47:30,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:47:30,680 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 39 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:47:30,680 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:47:30,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504714024] [2022-03-18 00:47:30,680 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504714024] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:47:30,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1877344176] [2022-03-18 00:47:30,680 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:47:30,680 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:47:30,680 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:47:30,681 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) [2022-03-18 00:47:30,682 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-03-18 00:47:30,741 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:47:30,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:47:30,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 80 conjunts are in the unsatisfiable core [2022-03-18 00:47:30,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:47:31,066 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 39 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:47:31,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:47:48,568 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 39 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:47:48,568 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1877344176] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:47:48,568 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:47:48,568 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 42] total 83 [2022-03-18 00:47:48,568 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:47:48,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [310359249] [2022-03-18 00:47:48,568 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [310359249] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:47:48,568 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:47:48,568 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-03-18 00:47:48,568 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073167667] [2022-03-18 00:47:48,568 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:47:48,569 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-03-18 00:47:48,569 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:47:48,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-03-18 00:47:48,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1803, Invalid=5003, Unknown=0, NotChecked=0, Total=6806 [2022-03-18 00:47:48,569 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) [2022-03-18 00:47:50,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:47:50,282 INFO L93 Difference]: Finished difference Result 100 states and 104 transitions. [2022-03-18 00:47:50,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-03-18 00:47:50,283 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 [2022-03-18 00:47:50,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:47:50,283 INFO L225 Difference]: With dead ends: 100 [2022-03-18 00:47:50,283 INFO L226 Difference]: Without dead ends: 93 [2022-03-18 00:47:50,284 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 138 SyntacticMatches, 2 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 863 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=3595, Invalid=11167, Unknown=0, NotChecked=0, Total=14762 [2022-03-18 00:47:50,284 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 47 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 3013 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 3092 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 3013 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:47:50,284 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 84 Invalid, 3092 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 3013 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-03-18 00:47:50,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-03-18 00:47:50,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2022-03-18 00:47:50,291 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) [2022-03-18 00:47:50,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2022-03-18 00:47:50,292 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 89 [2022-03-18 00:47:50,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:47:50,292 INFO L478 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2022-03-18 00:47:50,292 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) [2022-03-18 00:47:50,292 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2022-03-18 00:47:50,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-03-18 00:47:50,292 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:47:50,292 INFO L500 BasicCegarLoop]: trace histogram [40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:47:50,309 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-03-18 00:47:50,499 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 [2022-03-18 00:47:50,499 INFO L403 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:47:50,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:47:50,499 INFO L85 PathProgramCache]: Analyzing trace with hash -1891739288, now seen corresponding path program 77 times [2022-03-18 00:47:50,499 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:47:50,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [122587931] [2022-03-18 00:47:50,647 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:47:50,648 INFO L85 PathProgramCache]: Analyzing trace with hash 1001932913, now seen corresponding path program 1 times [2022-03-18 00:47:50,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:47:50,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [291378909] [2022-03-18 00:47:50,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:47:50,648 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:47:50,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:47:50,654 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:47:50,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:47:50,662 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:47:50,662 INFO L85 PathProgramCache]: Analyzing trace with hash -1891739288, now seen corresponding path program 78 times [2022-03-18 00:47:50,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:47:50,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885701806] [2022-03-18 00:47:50,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:47:50,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:47:50,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:47:51,300 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:47:51,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:47:51,302 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 40 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:47:51,302 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:47:51,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1885701806] [2022-03-18 00:47:51,303 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1885701806] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:47:51,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [217095126] [2022-03-18 00:47:51,303 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:47:51,303 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:47:51,303 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:47:51,304 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) [2022-03-18 00:47:51,305 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-03-18 00:47:51,365 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-18 00:47:51,366 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:47:51,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-18 00:47:51,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:47:51,982 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 117 proven. 1 refuted. 0 times theorem prover too weak. 1482 trivial. 0 not checked. [2022-03-18 00:47:51,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:47:52,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 117 proven. 1 refuted. 0 times theorem prover too weak. 1482 trivial. 0 not checked. [2022-03-18 00:47:52,932 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [217095126] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:47:52,932 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:47:52,932 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 4, 8] total 51 [2022-03-18 00:47:52,932 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:47:52,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [122587931] [2022-03-18 00:47:52,932 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [122587931] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:47:52,932 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:47:52,932 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-03-18 00:47:52,932 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745193752] [2022-03-18 00:47:52,932 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:47:52,932 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-03-18 00:47:52,932 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:47:52,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-03-18 00:47:52,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=2245, Unknown=0, NotChecked=0, Total=2550 [2022-03-18 00:47:52,933 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) [2022-03-18 00:47:55,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:47:55,167 INFO L93 Difference]: Finished difference Result 102 states and 106 transitions. [2022-03-18 00:47:55,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-03-18 00:47:55,168 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 [2022-03-18 00:47:55,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:47:55,169 INFO L225 Difference]: With dead ends: 102 [2022-03-18 00:47:55,169 INFO L226 Difference]: Without dead ends: 95 [2022-03-18 00:47:55,170 INFO L911 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 [2022-03-18 00:47:55,170 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 48 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 3168 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 3249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 3168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-03-18 00:47:55,170 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 84 Invalid, 3249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 3168 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-03-18 00:47:55,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-03-18 00:47:55,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2022-03-18 00:47:55,179 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) [2022-03-18 00:47:55,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2022-03-18 00:47:55,180 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 91 [2022-03-18 00:47:55,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:47:55,180 INFO L478 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2022-03-18 00:47:55,180 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) [2022-03-18 00:47:55,180 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2022-03-18 00:47:55,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2022-03-18 00:47:55,180 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:47:55,180 INFO L500 BasicCegarLoop]: trace histogram [41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:47:55,186 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-03-18 00:47:55,383 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 [2022-03-18 00:47:55,383 INFO L403 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:47:55,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:47:55,384 INFO L85 PathProgramCache]: Analyzing trace with hash 751647493, now seen corresponding path program 79 times [2022-03-18 00:47:55,384 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:47:55,384 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1278492214] [2022-03-18 00:47:55,524 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:47:55,524 INFO L85 PathProgramCache]: Analyzing trace with hash 1061038257, now seen corresponding path program 1 times [2022-03-18 00:47:55,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:47:55,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325852485] [2022-03-18 00:47:55,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:47:55,524 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:47:55,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:47:55,531 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:47:55,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:47:55,534 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:47:55,534 INFO L85 PathProgramCache]: Analyzing trace with hash 751647493, now seen corresponding path program 80 times [2022-03-18 00:47:55,534 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:47:55,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449810805] [2022-03-18 00:47:55,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:47:55,534 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:47:55,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:47:56,488 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:47:56,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:47:56,491 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 41 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:47:56,491 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:47:56,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449810805] [2022-03-18 00:47:56,491 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [449810805] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:47:56,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1636134674] [2022-03-18 00:47:56,492 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:47:56,492 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:47:56,492 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:47:56,493 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) [2022-03-18 00:47:56,493 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-03-18 00:47:56,591 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:47:56,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:47:56,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 85 conjunts are in the unsatisfiable core [2022-03-18 00:47:56,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:47:56,960 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:47:56,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:48:49,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:48:49,366 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1636134674] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:48:49,366 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:48:49,366 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 88 [2022-03-18 00:48:49,366 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:48:49,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1278492214] [2022-03-18 00:48:49,366 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1278492214] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:48:49,366 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:48:49,366 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-03-18 00:48:49,366 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500047352] [2022-03-18 00:48:49,366 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:48:49,367 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-03-18 00:48:49,367 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:48:49,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-03-18 00:48:49,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2020, Invalid=5636, Unknown=0, NotChecked=0, Total=7656 [2022-03-18 00:48:49,368 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) [2022-03-18 00:48:51,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:48:51,436 INFO L93 Difference]: Finished difference Result 104 states and 108 transitions. [2022-03-18 00:48:51,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-03-18 00:48:51,436 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 [2022-03-18 00:48:51,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:48:51,436 INFO L225 Difference]: With dead ends: 104 [2022-03-18 00:48:51,437 INFO L226 Difference]: Without dead ends: 97 [2022-03-18 00:48:51,437 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 143 SyntacticMatches, 2 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 910 ImplicationChecksByTransitivity, 52.4s TimeCoverageRelationStatistics Valid=3986, Invalid=12526, Unknown=0, NotChecked=0, Total=16512 [2022-03-18 00:48:51,438 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 49 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 3339 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 3422 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 3339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-18 00:48:51,438 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 94 Invalid, 3422 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 3339 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-18 00:48:51,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-03-18 00:48:51,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2022-03-18 00:48:51,445 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) [2022-03-18 00:48:51,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2022-03-18 00:48:51,446 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 93 [2022-03-18 00:48:51,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:48:51,446 INFO L478 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2022-03-18 00:48:51,446 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) [2022-03-18 00:48:51,446 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2022-03-18 00:48:51,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-03-18 00:48:51,446 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:48:51,446 INFO L500 BasicCegarLoop]: trace histogram [42, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:48:51,469 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-03-18 00:48:51,656 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 [2022-03-18 00:48:51,657 INFO L403 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:48:51,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:48:51,657 INFO L85 PathProgramCache]: Analyzing trace with hash -1574295198, now seen corresponding path program 81 times [2022-03-18 00:48:51,657 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:48:51,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [937124386] [2022-03-18 00:48:51,782 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:48:51,783 INFO L85 PathProgramCache]: Analyzing trace with hash 1120143601, now seen corresponding path program 1 times [2022-03-18 00:48:51,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:48:51,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263692692] [2022-03-18 00:48:51,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:48:51,783 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:48:51,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:48:51,786 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:48:51,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:48:51,792 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:48:51,792 INFO L85 PathProgramCache]: Analyzing trace with hash -1574295198, now seen corresponding path program 82 times [2022-03-18 00:48:51,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:48:51,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [750575620] [2022-03-18 00:48:51,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:48:51,792 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:48:51,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:48:52,699 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:48:52,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:48:52,702 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 42 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:48:52,702 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:48:52,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [750575620] [2022-03-18 00:48:52,702 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [750575620] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:48:52,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1988530076] [2022-03-18 00:48:52,702 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:48:52,703 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:48:52,703 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:48:52,704 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) [2022-03-18 00:48:52,704 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-03-18 00:48:52,831 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:48:52,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:48:52,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 86 conjunts are in the unsatisfiable core [2022-03-18 00:48:52,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:48:53,130 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 42 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:48:53,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:49:38,077 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 42 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:49:38,077 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1988530076] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:49:38,077 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:49:38,077 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 45] total 89 [2022-03-18 00:49:38,077 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:49:38,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [937124386] [2022-03-18 00:49:38,077 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [937124386] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:49:38,077 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:49:38,077 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-03-18 00:49:38,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011144540] [2022-03-18 00:49:38,078 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:49:38,078 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-03-18 00:49:38,078 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:49:38,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-03-18 00:49:38,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2067, Invalid=5765, Unknown=0, NotChecked=0, Total=7832 [2022-03-18 00:49:38,079 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) [2022-03-18 00:49:40,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:49:40,325 INFO L93 Difference]: Finished difference Result 106 states and 110 transitions. [2022-03-18 00:49:40,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-03-18 00:49:40,326 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 [2022-03-18 00:49:40,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:49:40,326 INFO L225 Difference]: With dead ends: 106 [2022-03-18 00:49:40,326 INFO L226 Difference]: Without dead ends: 99 [2022-03-18 00:49:40,327 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 147 SyntacticMatches, 2 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 44.3s TimeCoverageRelationStatistics Valid=4123, Invalid=12907, Unknown=0, NotChecked=0, Total=17030 [2022-03-18 00:49:40,327 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 50 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 3652 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 3737 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 3652 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-03-18 00:49:40,327 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 219 Invalid, 3737 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 3652 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-03-18 00:49:40,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-03-18 00:49:40,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2022-03-18 00:49:40,335 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) [2022-03-18 00:49:40,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2022-03-18 00:49:40,335 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 95 [2022-03-18 00:49:40,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:49:40,335 INFO L478 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2022-03-18 00:49:40,335 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) [2022-03-18 00:49:40,336 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2022-03-18 00:49:40,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-03-18 00:49:40,336 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:49:40,336 INFO L500 BasicCegarLoop]: trace histogram [43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:49:40,352 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2022-03-18 00:49:40,538 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 [2022-03-18 00:49:40,538 INFO L403 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:49:40,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:49:40,538 INFO L85 PathProgramCache]: Analyzing trace with hash 872739967, now seen corresponding path program 83 times [2022-03-18 00:49:40,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:49:40,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [907406159] [2022-03-18 00:49:40,699 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:49:40,699 INFO L85 PathProgramCache]: Analyzing trace with hash 1179248945, now seen corresponding path program 1 times [2022-03-18 00:49:40,699 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:49:40,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448035608] [2022-03-18 00:49:40,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:49:40,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:49:40,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:49:40,703 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:49:40,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:49:40,706 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:49:40,706 INFO L85 PathProgramCache]: Analyzing trace with hash 872739967, now seen corresponding path program 84 times [2022-03-18 00:49:40,706 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:49:40,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [779737675] [2022-03-18 00:49:40,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:49:40,706 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:49:40,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:49:41,570 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:49:41,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:49:41,587 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 43 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:49:41,587 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:49:41,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [779737675] [2022-03-18 00:49:41,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [779737675] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:49:41,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [171806172] [2022-03-18 00:49:41,588 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:49:41,588 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:49:41,588 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:49:41,612 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) [2022-03-18 00:49:41,613 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-03-18 00:49:41,649 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-18 00:49:41,649 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:49:41,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-18 00:49:41,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:49:44,538 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 126 proven. 1 refuted. 0 times theorem prover too weak. 1722 trivial. 0 not checked. [2022-03-18 00:49:44,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:49:46,907 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 126 proven. 1 refuted. 0 times theorem prover too weak. 1722 trivial. 0 not checked. [2022-03-18 00:49:46,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [171806172] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:49:46,908 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:49:46,908 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 4, 8] total 54 [2022-03-18 00:49:46,908 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:49:46,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [907406159] [2022-03-18 00:49:46,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [907406159] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:49:46,908 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:49:46,908 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-03-18 00:49:46,908 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851778837] [2022-03-18 00:49:46,908 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:49:46,910 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-03-18 00:49:46,910 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:49:46,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-03-18 00:49:46,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=2536, Unknown=0, NotChecked=0, Total=2862 [2022-03-18 00:49:46,927 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) [2022-03-18 00:49:50,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:49:50,121 INFO L93 Difference]: Finished difference Result 108 states and 112 transitions. [2022-03-18 00:49:50,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-03-18 00:49:50,122 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 [2022-03-18 00:49:50,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:49:50,122 INFO L225 Difference]: With dead ends: 108 [2022-03-18 00:49:50,122 INFO L226 Difference]: Without dead ends: 101 [2022-03-18 00:49:50,123 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 188 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 914 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=752, Invalid=8560, Unknown=0, NotChecked=0, Total=9312 [2022-03-18 00:49:50,124 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 51 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 3711 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 3798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 3711 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-03-18 00:49:50,124 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 129 Invalid, 3798 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 3711 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-03-18 00:49:50,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-03-18 00:49:50,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2022-03-18 00:49:50,131 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) [2022-03-18 00:49:50,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2022-03-18 00:49:50,132 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2022-03-18 00:49:50,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:49:50,132 INFO L478 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2022-03-18 00:49:50,132 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) [2022-03-18 00:49:50,132 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2022-03-18 00:49:50,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-03-18 00:49:50,133 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:49:50,133 INFO L500 BasicCegarLoop]: trace histogram [44, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:49:50,149 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-03-18 00:49:50,338 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 [2022-03-18 00:49:50,338 INFO L403 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:49:50,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:49:50,338 INFO L85 PathProgramCache]: Analyzing trace with hash -1168544676, now seen corresponding path program 85 times [2022-03-18 00:49:50,339 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:49:50,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [537261678] [2022-03-18 00:49:50,481 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:49:50,482 INFO L85 PathProgramCache]: Analyzing trace with hash 1238354289, now seen corresponding path program 1 times [2022-03-18 00:49:50,482 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:49:50,482 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1262334408] [2022-03-18 00:49:50,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:49:50,482 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:49:50,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:49:50,485 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:49:50,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:49:50,487 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:49:50,488 INFO L85 PathProgramCache]: Analyzing trace with hash -1168544676, now seen corresponding path program 86 times [2022-03-18 00:49:50,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:49:50,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2133085609] [2022-03-18 00:49:50,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:49:50,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:49:50,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:49:51,380 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:49:51,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:49:51,383 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 44 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:49:51,383 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:49:51,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2133085609] [2022-03-18 00:49:51,383 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2133085609] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:49:51,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [494279658] [2022-03-18 00:49:51,383 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:49:51,383 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:49:51,383 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:49:51,385 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) [2022-03-18 00:49:51,386 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-03-18 00:49:51,519 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:49:51,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:49:51,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 90 conjunts are in the unsatisfiable core [2022-03-18 00:49:51,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:49:51,791 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 44 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:49:51,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:50:45,057 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 44 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:50:45,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [494279658] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:50:45,058 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:50:45,058 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 47] total 93 [2022-03-18 00:50:45,058 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:50:45,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [537261678] [2022-03-18 00:50:45,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [537261678] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:50:45,058 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:50:45,058 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2022-03-18 00:50:45,058 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9957130] [2022-03-18 00:50:45,058 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:50:45,059 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-03-18 00:50:45,059 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:50:45,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-03-18 00:50:45,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2253, Invalid=6303, Unknown=0, NotChecked=0, Total=8556 [2022-03-18 00:50:45,066 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) [2022-03-18 00:50:47,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:50:47,463 INFO L93 Difference]: Finished difference Result 110 states and 114 transitions. [2022-03-18 00:50:47,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-03-18 00:50:47,464 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 [2022-03-18 00:50:47,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:50:47,464 INFO L225 Difference]: With dead ends: 110 [2022-03-18 00:50:47,464 INFO L226 Difference]: Without dead ends: 103 [2022-03-18 00:50:47,466 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 153 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1083 ImplicationChecksByTransitivity, 52.4s TimeCoverageRelationStatistics Valid=4495, Invalid=14137, Unknown=0, NotChecked=0, Total=18632 [2022-03-18 00:50:47,466 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 52 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 3792 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 3881 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 3792 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-03-18 00:50:47,467 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 54 Invalid, 3881 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 3792 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-03-18 00:50:47,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-03-18 00:50:47,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2022-03-18 00:50:47,476 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) [2022-03-18 00:50:47,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2022-03-18 00:50:47,477 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 99 [2022-03-18 00:50:47,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:50:47,477 INFO L478 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2022-03-18 00:50:47,477 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) [2022-03-18 00:50:47,477 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2022-03-18 00:50:47,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2022-03-18 00:50:47,478 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:50:47,478 INFO L500 BasicCegarLoop]: trace histogram [45, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:50:47,502 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-03-18 00:50:47,701 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 [2022-03-18 00:50:47,702 INFO L403 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:50:47,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:50:47,702 INFO L85 PathProgramCache]: Analyzing trace with hash -43032327, now seen corresponding path program 87 times [2022-03-18 00:50:47,702 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:50:47,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1976966849] [2022-03-18 00:50:47,787 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:50:47,787 INFO L85 PathProgramCache]: Analyzing trace with hash 1297459633, now seen corresponding path program 1 times [2022-03-18 00:50:47,787 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:50:47,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209496382] [2022-03-18 00:50:47,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:50:47,787 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:50:47,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:50:47,790 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:50:47,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:50:47,793 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:50:47,793 INFO L85 PathProgramCache]: Analyzing trace with hash -43032327, now seen corresponding path program 88 times [2022-03-18 00:50:47,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:50:47,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122117733] [2022-03-18 00:50:47,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:50:47,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:50:47,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:50:48,837 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:50:48,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:50:48,840 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 45 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:50:48,840 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:50:48,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122117733] [2022-03-18 00:50:48,840 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2122117733] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:50:48,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [244888530] [2022-03-18 00:50:48,840 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:50:48,840 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:50:48,840 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:50:48,841 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) [2022-03-18 00:50:48,843 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-03-18 00:50:48,893 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:50:48,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:50:48,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 92 conjunts are in the unsatisfiable core [2022-03-18 00:50:48,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:50:49,205 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 45 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:50:49,205 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:52:36,035 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 45 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:52:36,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [244888530] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:52:36,036 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:52:36,036 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47, 48] total 95 [2022-03-18 00:52:36,036 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:52:36,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1976966849] [2022-03-18 00:52:36,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1976966849] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:52:36,036 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:52:36,036 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2022-03-18 00:52:36,037 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584172188] [2022-03-18 00:52:36,037 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:52:36,037 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-03-18 00:52:36,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:52:36,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-03-18 00:52:36,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2349, Invalid=6581, Unknown=0, NotChecked=0, Total=8930 [2022-03-18 00:52:36,038 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) [2022-03-18 00:52:38,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:52:38,606 INFO L93 Difference]: Finished difference Result 112 states and 116 transitions. [2022-03-18 00:52:38,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-03-18 00:52:38,606 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 [2022-03-18 00:52:38,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:52:38,606 INFO L225 Difference]: With dead ends: 112 [2022-03-18 00:52:38,606 INFO L226 Difference]: Without dead ends: 105 [2022-03-18 00:52:38,607 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 156 SyntacticMatches, 2 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1130 ImplicationChecksByTransitivity, 104.6s TimeCoverageRelationStatistics Valid=4687, Invalid=14773, Unknown=0, NotChecked=0, Total=19460 [2022-03-18 00:52:38,608 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 53 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 4189 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 4280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 4189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-03-18 00:52:38,608 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 239 Invalid, 4280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 4189 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-03-18 00:52:38,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-03-18 00:52:38,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2022-03-18 00:52:38,616 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) [2022-03-18 00:52:38,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2022-03-18 00:52:38,616 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 101 [2022-03-18 00:52:38,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:52:38,617 INFO L478 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2022-03-18 00:52:38,617 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) [2022-03-18 00:52:38,617 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2022-03-18 00:52:38,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-03-18 00:52:38,617 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:52:38,617 INFO L500 BasicCegarLoop]: trace histogram [46, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:52:38,634 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-03-18 00:52:38,833 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 [2022-03-18 00:52:38,833 INFO L403 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:52:38,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:52:38,834 INFO L85 PathProgramCache]: Analyzing trace with hash -757423530, now seen corresponding path program 89 times [2022-03-18 00:52:38,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:52:38,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [161034519] [2022-03-18 00:52:38,940 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:52:38,941 INFO L85 PathProgramCache]: Analyzing trace with hash 1356564977, now seen corresponding path program 1 times [2022-03-18 00:52:38,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:52:38,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1082320541] [2022-03-18 00:52:38,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:52:38,941 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:52:38,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:52:38,944 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:52:38,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:52:38,947 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:52:38,947 INFO L85 PathProgramCache]: Analyzing trace with hash -757423530, now seen corresponding path program 90 times [2022-03-18 00:52:38,947 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:52:38,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [901405465] [2022-03-18 00:52:38,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:52:38,947 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:52:38,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:52:39,974 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:52:39,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:52:39,977 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 46 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:52:39,978 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:52:39,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [901405465] [2022-03-18 00:52:39,978 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [901405465] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:52:39,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1058021915] [2022-03-18 00:52:39,978 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:52:39,978 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:52:39,978 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:52:39,979 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) [2022-03-18 00:52:39,982 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-03-18 00:52:40,054 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-18 00:52:40,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:52:40,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-18 00:52:40,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:52:43,417 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 135 proven. 1 refuted. 0 times theorem prover too weak. 1980 trivial. 0 not checked. [2022-03-18 00:52:43,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:52:47,662 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 135 proven. 1 refuted. 0 times theorem prover too weak. 1980 trivial. 0 not checked. [2022-03-18 00:52:47,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1058021915] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:52:47,663 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:52:47,663 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 4, 8] total 57 [2022-03-18 00:52:47,663 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:52:47,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [161034519] [2022-03-18 00:52:47,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [161034519] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:52:47,663 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:52:47,663 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2022-03-18 00:52:47,663 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593433588] [2022-03-18 00:52:47,663 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:52:47,664 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-03-18 00:52:47,664 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:52:47,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-03-18 00:52:47,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=347, Invalid=2845, Unknown=0, NotChecked=0, Total=3192 [2022-03-18 00:52:47,665 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) [2022-03-18 00:52:51,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:52:51,737 INFO L93 Difference]: Finished difference Result 114 states and 118 transitions. [2022-03-18 00:52:51,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-03-18 00:52:51,738 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 [2022-03-18 00:52:51,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:52:51,738 INFO L225 Difference]: With dead ends: 114 [2022-03-18 00:52:51,739 INFO L226 Difference]: Without dead ends: 107 [2022-03-18 00:52:51,739 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 200 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1046 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=803, Invalid=9703, Unknown=0, NotChecked=0, Total=10506 [2022-03-18 00:52:51,739 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 54 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 4332 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 4425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 4332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-03-18 00:52:51,740 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 209 Invalid, 4425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 4332 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-03-18 00:52:51,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-03-18 00:52:51,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2022-03-18 00:52:51,748 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) [2022-03-18 00:52:51,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2022-03-18 00:52:51,748 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 103 [2022-03-18 00:52:51,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:52:51,749 INFO L478 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2022-03-18 00:52:51,749 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) [2022-03-18 00:52:51,749 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2022-03-18 00:52:51,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-03-18 00:52:51,749 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:52:51,749 INFO L500 BasicCegarLoop]: trace histogram [47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:52:51,753 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-03-18 00:52:51,953 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 [2022-03-18 00:52:51,954 INFO L403 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:52:51,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:52:51,954 INFO L85 PathProgramCache]: Analyzing trace with hash -92602253, now seen corresponding path program 91 times [2022-03-18 00:52:51,954 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:52:51,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1725673797] [2022-03-18 00:52:52,104 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:52:52,104 INFO L85 PathProgramCache]: Analyzing trace with hash 1415670321, now seen corresponding path program 1 times [2022-03-18 00:52:52,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:52:52,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892135473] [2022-03-18 00:52:52,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:52:52,104 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:52:52,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:52:52,107 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:52:52,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:52:52,110 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:52:52,110 INFO L85 PathProgramCache]: Analyzing trace with hash -92602253, now seen corresponding path program 92 times [2022-03-18 00:52:52,110 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:52:52,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348637696] [2022-03-18 00:52:52,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:52:52,110 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:52:52,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:52:53,236 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:52:53,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:52:53,239 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 47 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:52:53,239 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:52:53,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348637696] [2022-03-18 00:52:53,239 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [348637696] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:52:53,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2025296036] [2022-03-18 00:52:53,239 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:52:53,239 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:52:53,239 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:52:53,240 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) [2022-03-18 00:52:53,244 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-03-18 00:52:53,289 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:52:53,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:52:53,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 97 conjunts are in the unsatisfiable core [2022-03-18 00:52:53,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:52:53,728 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:52:53,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:55:56,149 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:55:56,149 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2025296036] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:55:56,149 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:55:56,149 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 100 [2022-03-18 00:55:56,149 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:55:56,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1725673797] [2022-03-18 00:55:56,149 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1725673797] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:55:56,149 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:55:56,149 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2022-03-18 00:55:56,150 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164112277] [2022-03-18 00:55:56,150 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:55:56,150 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-03-18 00:55:56,150 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:55:56,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-03-18 00:55:56,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2596, Invalid=7304, Unknown=0, NotChecked=0, Total=9900 [2022-03-18 00:55:56,151 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) [2022-03-18 00:55:58,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:55:58,934 INFO L93 Difference]: Finished difference Result 116 states and 120 transitions. [2022-03-18 00:55:58,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-03-18 00:55:58,934 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 [2022-03-18 00:55:58,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:55:58,935 INFO L225 Difference]: With dead ends: 116 [2022-03-18 00:55:58,935 INFO L226 Difference]: Without dead ends: 109 [2022-03-18 00:55:58,936 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1183 ImplicationChecksByTransitivity, 180.1s TimeCoverageRelationStatistics Valid=5132, Invalid=16330, Unknown=0, NotChecked=0, Total=21462 [2022-03-18 00:55:58,936 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 55 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 4293 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 4388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 4293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-03-18 00:55:58,936 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 24 Invalid, 4388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 4293 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-03-18 00:55:58,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-03-18 00:55:58,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2022-03-18 00:55:58,944 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) [2022-03-18 00:55:58,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2022-03-18 00:55:58,945 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 105 [2022-03-18 00:55:58,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:55:58,945 INFO L478 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2022-03-18 00:55:58,945 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) [2022-03-18 00:55:58,945 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2022-03-18 00:55:58,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-03-18 00:55:58,945 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:55:58,945 INFO L500 BasicCegarLoop]: trace histogram [48, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:55:58,962 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2022-03-18 00:55:59,162 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 [2022-03-18 00:55:59,162 INFO L403 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:55:59,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:55:59,162 INFO L85 PathProgramCache]: Analyzing trace with hash -1149482160, now seen corresponding path program 93 times [2022-03-18 00:55:59,162 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:55:59,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [142122062] [2022-03-18 00:55:59,266 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:55:59,266 INFO L85 PathProgramCache]: Analyzing trace with hash 1474775665, now seen corresponding path program 1 times [2022-03-18 00:55:59,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:55:59,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1217258474] [2022-03-18 00:55:59,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:55:59,266 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:55:59,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:55:59,269 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:55:59,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:55:59,271 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:55:59,271 INFO L85 PathProgramCache]: Analyzing trace with hash -1149482160, now seen corresponding path program 94 times [2022-03-18 00:55:59,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:55:59,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685002061] [2022-03-18 00:55:59,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:55:59,272 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:55:59,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:56:00,335 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:56:00,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:56:00,338 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 48 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:56:00,338 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:56:00,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685002061] [2022-03-18 00:56:00,338 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [685002061] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:56:00,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1493916938] [2022-03-18 00:56:00,338 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-18 00:56:00,338 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:56:00,338 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:56:00,339 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) [2022-03-18 00:56:00,340 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-03-18 00:56:00,461 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-18 00:56:00,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:56:00,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 99 conjunts are in the unsatisfiable core [2022-03-18 00:56:00,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:56:00,896 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:56:00,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:59:31,456 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:59:31,457 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1493916938] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:59:31,457 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:59:31,457 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 102 [2022-03-18 00:59:31,457 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:59:31,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [142122062] [2022-03-18 00:59:31,457 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [142122062] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:59:31,457 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:59:31,457 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2022-03-18 00:59:31,457 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12651486] [2022-03-18 00:59:31,457 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:59:31,458 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-03-18 00:59:31,458 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:59:31,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-03-18 00:59:31,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2699, Invalid=7603, Unknown=0, NotChecked=0, Total=10302 [2022-03-18 00:59:31,458 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) [2022-03-18 00:59:34,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:59:34,497 INFO L93 Difference]: Finished difference Result 118 states and 122 transitions. [2022-03-18 00:59:34,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-03-18 00:59:34,497 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 [2022-03-18 00:59:34,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:59:34,498 INFO L225 Difference]: With dead ends: 118 [2022-03-18 00:59:34,498 INFO L226 Difference]: Without dead ends: 111 [2022-03-18 00:59:34,499 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 164 SyntacticMatches, 2 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1232 ImplicationChecksByTransitivity, 207.6s TimeCoverageRelationStatistics Valid=5337, Invalid=17013, Unknown=0, NotChecked=0, Total=22350 [2022-03-18 00:59:34,499 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 56 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 4666 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 4763 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 4666 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-03-18 00:59:34,499 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 179 Invalid, 4763 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 4666 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-03-18 00:59:34,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-03-18 00:59:34,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2022-03-18 00:59:34,516 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) [2022-03-18 00:59:34,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2022-03-18 00:59:34,517 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 107 [2022-03-18 00:59:34,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:59:34,517 INFO L478 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2022-03-18 00:59:34,517 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) [2022-03-18 00:59:34,517 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2022-03-18 00:59:34,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2022-03-18 00:59:34,518 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:59:34,518 INFO L500 BasicCegarLoop]: trace histogram [49, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:59:34,537 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-03-18 00:59:34,734 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 [2022-03-18 00:59:34,735 INFO L403 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:59:34,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:59:34,735 INFO L85 PathProgramCache]: Analyzing trace with hash 1096176365, now seen corresponding path program 95 times [2022-03-18 00:59:34,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:59:34,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1696377397] [2022-03-18 00:59:34,861 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:59:34,861 INFO L85 PathProgramCache]: Analyzing trace with hash 1533881009, now seen corresponding path program 1 times [2022-03-18 00:59:34,862 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:59:34,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1127506134] [2022-03-18 00:59:34,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:59:34,862 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:59:34,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:59:34,865 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:59:34,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:59:34,876 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:59:34,877 INFO L85 PathProgramCache]: Analyzing trace with hash 1096176365, now seen corresponding path program 96 times [2022-03-18 00:59:34,877 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:59:34,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1602716470] [2022-03-18 00:59:34,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:59:34,877 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:59:34,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:59:35,862 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:59:35,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:59:35,865 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 49 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:59:35,865 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:59:35,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1602716470] [2022-03-18 00:59:35,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1602716470] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:59:35,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [111067073] [2022-03-18 00:59:35,865 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-18 00:59:35,865 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:59:35,865 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:59:35,866 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) [2022-03-18 00:59:35,867 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-03-18 00:59:35,902 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-18 00:59:35,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:59:35,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-18 00:59:35,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:59:41,491 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 144 proven. 1 refuted. 0 times theorem prover too weak. 2256 trivial. 0 not checked. [2022-03-18 00:59:41,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 00:59:46,224 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 144 proven. 1 refuted. 0 times theorem prover too weak. 2256 trivial. 0 not checked. [2022-03-18 00:59:46,224 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [111067073] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 00:59:46,224 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-18 00:59:46,224 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 4, 8] total 60 [2022-03-18 00:59:46,224 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 00:59:46,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1696377397] [2022-03-18 00:59:46,224 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1696377397] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 00:59:46,224 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 00:59:46,224 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2022-03-18 00:59:46,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736658738] [2022-03-18 00:59:46,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 00:59:46,225 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-03-18 00:59:46,225 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 00:59:46,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-03-18 00:59:46,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=368, Invalid=3172, Unknown=0, NotChecked=0, Total=3540 [2022-03-18 00:59:46,225 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) [2022-03-18 00:59:50,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 00:59:50,793 INFO L93 Difference]: Finished difference Result 120 states and 124 transitions. [2022-03-18 00:59:50,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-03-18 00:59:50,794 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 [2022-03-18 00:59:50,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 00:59:50,794 INFO L225 Difference]: With dead ends: 120 [2022-03-18 00:59:50,794 INFO L226 Difference]: Without dead ends: 113 [2022-03-18 00:59:50,795 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 212 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1187 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=854, Invalid=10918, Unknown=0, NotChecked=0, Total=11772 [2022-03-18 00:59:50,795 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 57 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 4791 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 4890 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 4791 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-03-18 00:59:50,795 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 124 Invalid, 4890 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 4791 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-03-18 00:59:50,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-03-18 00:59:50,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2022-03-18 00:59:50,805 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) [2022-03-18 00:59:50,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2022-03-18 00:59:50,806 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 109 [2022-03-18 00:59:50,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 00:59:50,806 INFO L478 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2022-03-18 00:59:50,806 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) [2022-03-18 00:59:50,807 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2022-03-18 00:59:50,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-03-18 00:59:50,807 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 00:59:50,807 INFO L500 BasicCegarLoop]: trace histogram [50, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 00:59:50,826 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-03-18 00:59:51,021 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 [2022-03-18 00:59:51,021 INFO L403 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 00:59:51,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 00:59:51,022 INFO L85 PathProgramCache]: Analyzing trace with hash -1194530998, now seen corresponding path program 97 times [2022-03-18 00:59:51,022 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 00:59:51,022 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [46612907] [2022-03-18 00:59:51,162 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-18 00:59:51,162 INFO L85 PathProgramCache]: Analyzing trace with hash 1592986353, now seen corresponding path program 1 times [2022-03-18 00:59:51,163 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:59:51,163 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1514971771] [2022-03-18 00:59:51,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:59:51,163 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:59:51,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:59:51,166 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-18 00:59:51,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-18 00:59:51,169 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-18 00:59:51,170 INFO L85 PathProgramCache]: Analyzing trace with hash -1194530998, now seen corresponding path program 98 times [2022-03-18 00:59:51,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 00:59:51,170 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052847554] [2022-03-18 00:59:51,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 00:59:51,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 00:59:51,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:59:52,427 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 00:59:52,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 00:59:52,430 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 50 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:59:52,430 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 00:59:52,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052847554] [2022-03-18 00:59:52,430 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1052847554] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 00:59:52,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [347580850] [2022-03-18 00:59:52,431 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 00:59:52,431 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 00:59:52,431 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 00:59:52,432 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) [2022-03-18 00:59:52,432 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-03-18 00:59:52,498 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 00:59:52,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 00:59:52,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 103 conjunts are in the unsatisfiable core [2022-03-18 00:59:52,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 00:59:52,964 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 00:59:52,964 INFO L328 TraceCheckSpWp]: Computing backward predicates...